[UW-2934] chore(composer): added PHP 8.x to composer.json

[UW-2934] Merge official version 1.1.x

.coveralls.yml

@@ -0,0 +1,2 @@
+coverage_clover: build/reports/coveralls/clover.xml
+json_path: build/reports/coveralls/upload.json

.env

@@ -1,6 +1,6 @@
-# -----------------------------------------------------------------------------
+# ------------------------------------------------------------------------------
 ### Docker
-# -----------------------------------------------------------------------------
+# ------------------------------------------------------------------------------
 
 #
 # All containers
@@ -12,4 +12,4 @@ DOCKER_CONTAINER_PROJECT=common-library
 # PHP configuration:
 # - timezone
 #
-TIMEZONE=Europe/Warsaw
+PHP_DATE_TIMEZONE=Europe/London

.gitignore

@@ -1,92 +1,25 @@
 # ------------------------------------------------------------------------------
-# Environment-related parameters
+### Linux template
 # ------------------------------------------------------------------------------
-.env
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
 
 
 # ------------------------------------------------------------------------------
-### Vendors
-# ------------------------------------------------------------------------------
-/vendor/
-
-
-# ------------------------------------------------------------------------------
-### Composer
-# ------------------------------------------------------------------------------
-/composer.lock
-/composer.phar
-
-
-# ------------------------------------------------------------------------------
-### Phing
-# ------------------------------------------------------------------------------
-/phing/properties
-
-
-# ------------------------------------------------------------------------------
-### PHPUnit
-# ------------------------------------------------------------------------------
-/phpunit.xml
-
-
-# ------------------------------------------------------------------------------
-### PHP Coding Standards Fixer
-# ------------------------------------------------------------------------------
-/.php_cs
-/.php_cs.cache
-
-
-# -----------------------------------------------------------------------------
-### Build files
-# -----------------------------------------------------------------------------
-/build/
-
-
-# ------------------------------------------------------------------------------
-### Generated databases
-# ------------------------------------------------------------------------------
-/data/tmp
-*.sql
-*.sqlite
-
-
-# ------------------------------------------------------------------------------
-### Compiled source
-# ------------------------------------------------------------------------------
-*.com
-*.class
-*.dll
-*.exe
-*.o
-*.so
-
-
-# ------------------------------------------------------------------------------
-### Shell scripts
-# ------------------------------------------------------------------------------
-/*.sh
-
-
-# ------------------------------------------------------------------------------
-### JetBrains
-# ------------------------------------------------------------------------------
-/.idea
-
-
-# ------------------------------------------------------------------------------
-### NetBeans template
-# ------------------------------------------------------------------------------
-nbproject/private/
-nbbuild/
-dist/
-nbdist/
-nbactions.xml
-.nb-gradle/
-
-
-# ------------------------------------------------------------------------------
-### OSX template
+### macOS template
 # ------------------------------------------------------------------------------
+# General
 .DS_Store
 .AppleDouble
 .LSOverride
@@ -104,6 +37,7 @@ Icon
 .TemporaryItems
 .Trashes
 .VolumeIcon.icns
+.com.apple.timemachine.donotpresent
 
 # Directories potentially created on remote AFP share
 .AppleDB
@@ -113,30 +47,20 @@ Temporary Items
 .apdisk
 
 
-# ------------------------------------------------------------------------------
-### Linux template
-# ------------------------------------------------------------------------------
-*~
-
-# temporary files which can be created if a process still has a handle open of a deleted file
-.fuse_hidden*
-
-# KDE directory preferences
-.directory
-
-# Linux trash folder which might appear on any partition or disk
-.Trash-*
-
-
 # ------------------------------------------------------------------------------
 ### Windows template
 # ------------------------------------------------------------------------------
-# Windows image file caches
+# Windows thumbnail cache files
 Thumbs.db
+Thumbs.db:encryptable
 ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
 
 # Folder config file
-Desktop.ini
+[Dd]esktop.ini
 
 # Recycle Bin used on file shares
 $RECYCLE.BIN/
@@ -144,8 +68,137 @@ $RECYCLE.BIN/
 # Windows Installer files
 *.cab
 *.msi
+*.msix
 *.msm
 *.msp
 
 # Windows shortcuts
 *.lnk
+
+
+# ------------------------------------------------------------------------------
+### JetBrains template
+# ------------------------------------------------------------------------------
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+
+# ------------------------------------------------------------------------------
+### Build files
+# ------------------------------------------------------------------------------
+/build/
+
+
+# ------------------------------------------------------------------------------
+### Phing
+# ------------------------------------------------------------------------------
+/phing/properties
+
+
+# ------------------------------------------------------------------------------
+### Infection
+# ------------------------------------------------------------------------------
+/infection.json
+
+
+# ------------------------------------------------------------------------------
+### Temporary data & databases
+# ------------------------------------------------------------------------------
+/data/tmp
+*.sqlite
+
+
+# ------------------------------------------------------------------------------
+### Composer & vendors
+# ------------------------------------------------------------------------------
+/composer.lock
+/composer.phar
+/vendor/
+
+
+# ------------------------------------------------------------------------------
+### PHPUnit
+# ------------------------------------------------------------------------------
+/phpunit.xml
+/.phpunit.result.cache
+/tests/Resources/var
+
+
+# ------------------------------------------------------------------------------
+### PHP Coding Standards Fixer
+# ------------------------------------------------------------------------------
+/.php_cs
+/.php_cs.cache
+
+
+# ------------------------------------------------------------------------------
+### PHP_CodeSniffer
+# ------------------------------------------------------------------------------
+/.phpcs-cache
+/phpcs.xml

.php_cs.dist

@@ -1,27 +1,52 @@
 <?php
 
 $finder = PhpCsFixer\Finder::create()
-    ->in([
-        __DIR__ . '/src',
-        __DIR__ . '/tests',
+    ->in(__DIR__)
+    ->exclude([
+        'build',
+        'vendor',
+    ])
+    ->notPath([
+        'tests/Resources/var/',
     ]);
 
 return PhpCsFixer\Config::create()
     ->setRules([
-        '@Symfony'                            => true,
-        'binary_operator_spaces'              => [
+        '@Symfony' => true,
+        '@PhpCsFixer' => true,
+        '@PHP71Migration' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'binary_operator_spaces' => [
             'align_double_arrow' => true,
         ],
-        'blank_line_before_return'            => false,
-        'cast_spaces'                         => false,
-        'concat_space'                        => [
+        'blank_line_before_return' => false,
+        'cast_spaces' => false,
+        'concat_space' => [
             'spacing' => 'one',
         ],
+        'ordered_class_elements' => [
+            'order' => [
+                'use_trait',
+                'constant_public',
+                'constant_protected',
+                'constant_private',
+                'property_public',
+                'property_protected',
+                'property_private',
+                'construct',
+                'destruct',
+                'magic',
+                'method_public',
+                'method_protected',
+                'method_private',
+            ],
+        ],
         'phpdoc_add_missing_param_annotation' => true,
-        'phpdoc_align'                        => false,
-        'phpdoc_order'                        => true,
-        'phpdoc_separation'                   => false,
-        'phpdoc_summary'                      => false,
-        'trim_array_spaces'                   => false,
+        'phpdoc_align' => false,
+        'phpdoc_order' => true,
+        'phpdoc_separation' => false,
+        'phpdoc_summary' => false,
+        'trim_array_spaces' => false,
     ])
-    ->setFinder($finder);
+    ->setFinder($finder)
+;

.travis-php-config.ini

@@ -0,0 +1,2 @@
+date.timezone   = Europe/London
+memory_limit    = 2G

.travis.yml

@@ -1,16 +1,23 @@
 language: php
 
 php:
-  - 5.6
-  - 7.0
-  - 7.1
+  - 7.2
+  - 7.3
+  - 7.4
 
 before_install:
   - sudo locale-gen de_DE.UTF-8 es_ES.UTF-8 en_GB.UTF-8 en_US.UTF-8 fr_FR.UTF-8 it_IT.UTF-8 pl_PL.UTF-8 ru_RU.UTF-8
-  - composer global require hirak/prestissimo
+  - pear channel-discover pear.phing.info
 
 install:
-  - travis_wait 30 composer install -vvv
+  - pear install phing/phing
+  - phpenv rehash
+
+before_script:
+  - phpenv config-add .travis-php-config.ini
 
 script:
-  - php ./vendor/bin/phpunit
+  - phing
+
+after_success:
+  - travis_retry php vendor/bin/php-coveralls -v

CHANGELOG.md

@@ -2,6 +2,159 @@
 
 Common and useful classes, methods, exceptions etc.
 
+# 1.1.8
+
+1. [Composer] Upgrade all dev packages (to the latest, stable versions for PHP `7.4`)
+2. [BaseCollection] Interfaces of different types of collections. May be used to build specific collections.
+
+# 1.1.7
+
+1. [Arrays] Allow to define a key of next level elements in a function that returns elements from given level
+
+# 1.1.6
+
+1. [Arrays] Function that returns elements from given level
+
+# 1.1.5
+
+1. [BaseCollection] Prepare elements while adding them by `addMultiple()` method in the same way as passing them in
+   constructor.
+
+# 1.1.4
+
+1. [BaseCollection] Fix incorrectly working limit() method
+
+# 1.1.3
+
+1. Move `Renderable` class: `Meritoo\Common` -> `Meritoo\Common\Contract`
+2. Create and implement `CollectionInterface` as contract of all collections (e.g. based on the `BaseCollection` class)
+
+# 1.1.2
+
+1. Change mode of `Xdebug` to `coverage` in Docker's configuration to make it possible to generate code coverage by
+   `PHPUnit`
+2. Mark PHPUnit test as risky when it does not have a `@covers` annotation
+
+# 1.1.1
+
+1. [BaseCollection] Treat the `null` index as "no index" only while adding new element, iow. do not treat empty string
+   as "no index" behaviour.
+2. [Miscellaneous] [Regex] Use simpler & stronger pattern to match name of file
+3. Do not install `hirak/prestissimo` package while running Travis CI (incompatible with your PHP version, PHP
+   extensions and Composer version)
+4. Use PHP `7.4` while running build in Travis CI
+
+# 1.1.0
+
+1. Rename Meritoo\Common\Collection\Collection class to Meritoo\Common\Collection\BaseCollection. Add BaseCollection::
+   isValidType() method to validate type of element before add it to collection. Add BaseCollection ::prepareElements()
+   method to allow preparation of elements in custom way.
+
+# 1.0.6
+
+1. Use `.env` instead of `.env.dist`
+2. Docker > use images (instead of Dockerfiles)
+3. composer > squizlabs/php_codesniffer package > use ^3.4 (instead of ^2.9)
+4. Do not require name of class by BaseTestCaseTrait::assertMethodVisibilityAndArguments() method
+5. PHP CS Fixer > configuration > make more readable & remove unnecessary code
+6. Update .gitignore, docker-compose.yml, phpunit.xml.dist
+
+# 1.0.5
+
+1. Collection > trait > return "void" where "self" causes type hinting problem and is not required
+
+# 1.0.4
+
+1. PHP Coding Standards Fixer > update configuration
+2. Phing > tests > add task for Psalm (https://psalm.dev)
+3. Collection > trait > split into smaller traits (to make it more flexible)
+
+# 1.0.3
+
+1. Travis CI > run many tasks using Phing > update configuration
+2. Template with placeholders > verification of placeholders without values > make stronger and point out which are
+   missing
+3. Reflection > getPropertyValue() method > look for the property in parent classes
+
+# 1.0.2
+
+1. Phing > remove old and unused tools
+2. Phing > configuration > minor updates
+3. Implement Mutation Testing Framework (infection/infection package)
+4. Travis CI > run many tasks using Phing (instead of PHPUnit only)
+5. Fix integration with [Coveralls](https://www.coveralls.io) (available as the badge in [README.md](README.md))
+6. Implement [PHPStan](https://github.com/phpstan/phpstan)
+7. PHPUnit > execute tests in random order
+8. Implement [Psalm](https://github.com/vimeo/psalm)
+9. Infection (Mutation Testing Framework) > fix bugs while running (generate proper code coverage, bugs while running
+   tests randomly)
+10. Phing > php-coveralls > add task
+
+# 1.0.1
+
+1. Regex > make compatible with PHP 7.3 Tests > Regex > fix "preg_match(): Compilation failed: invalid range in
+   character class at offset 4" bug
+2. Collection/storage of templates
+3. Template with placeholders that may be filled by real data
+4. RenderableInterface > something that may be rendered
+
+# 1.0.0
+
+1. Composer > support/require PHP 7.2+ (instead of 5.6+)
+
+# 0.1.8
+
+1. Size, e.g. of image
+
+# 0.1.7
+
+1. Collection > create trait (to make it more flexible)
+
+# 0.1.6
+
+1. Arrays > refactoring & more tests
+2. ValueObject > Human > represents a human
+3. Tests > use `Meritoo\Test\Common` namespace (instead of `Meritoo\Common\Test`)
+4. Tests > use @dataProvider
+
+# 0.1.5
+
+1. Tests > Date > one more test case
+2. Phing > update configuration
+3. Miscellaneous > variableDump() method > remove, because unnecessary
+4. Regex > createSlug() method > returns slug for given value
+5. Arrays > getNonEmptyValues() method > returns non-empty values, e.g. without "" (empty string), null or []
+6. Arrays > getNonEmptyValuesAsString() method > returns non-empty values concatenated by given separator
+7. ValueObject > Company > represents a company
+8. ValueObject > BankAccount > represents bank account
+9. ValueObject > Address > represents address of company, institution, user etc.
+
+# 0.1.4
+
+1. Phing > update configuration
+2. Utilities > Date > update descriptions of methods
+3. Docker > docker-compose.yml > add "phpunit" service > used to run PHPUnit's tests
+4. Reflection > setPropertiesValues() method > sets values of properties in given object
+
+# 0.1.3
+
+1. Tests > refactoring & minor improvements
+2. Utilities > CssSelector > useful methods related to CSS selectors
+3. Utilities > Bootstrap4CssSelector > useful methods related to CSS selectors and the Bootstrap4 (front-end component
+   library)
+
+# 0.1.2
+
+1. Documentation > Value Objects
+2. Docker > improve performance
+3. Utilities > Reflection > setPropertyValue() method > sets value of given property
+
+# 0.1.1
+
+1. TravisCI > run using PHP 7.2 too
+2. ValueObject > class Version > represents version of software
+3. Move version of this package to `VERSION` file (from `composer.json` file)
+
 # 0.1.0
 
 1. Composer > support/require PHP 5.6+ (instead of 5.5.9+)
@@ -27,5 +180,6 @@ Common and useful classes, methods, exceptions etc.
 4. StyleCI & PHP Coding Standards Fixer: update configuration
 5. Documentation > Docker > add paragraph for PHP Coding Standards Fixer
 6. Coding standard > fix automatically
-7. StyleCI configuration > fix bug "The provided fixer 'binary_operator_spaces' cannot be enabled again because it was already enabled"
+7. StyleCI configuration > fix bug "The provided fixer 'binary_operator_spaces' cannot be enabled again because it was
+   already enabled"
 8. StyleCI > disable & remove

README.md

@@ -2,14 +2,31 @@
 
 Common and useful classes, methods, exceptions etc.
 
-[![Travis](https://img.shields.io/travis/rust-lang/rust.svg?style=flat-square)](https://travis-ci.org/meritoo/common-library) [![Packagist](https://img.shields.io/packagist/v/meritoo/common-library.svg?style=flat-square)](https://packagist.org/packages/meritoo/common-library) [![license](https://img.shields.io/github/license/meritoo/common-library.svg?style=flat-square)](https://github.com/meritoo/common-library) [![GitHub commits](https://img.shields.io/github/commits-since/meritoo/common-library/0.0.1.svg?style=flat-square)](https://github.com/meritoo/common-library) [![Coverage Status](https://coveralls.io/repos/github/meritoo/common-library/badge.svg?branch=master)](https://coveralls.io/github/meritoo/common-library?branch=master)
+![PHP from Packagist](https://img.shields.io/packagist/php-v/meritoo/common-library.svg?style=flat-square)
+[![Build Status](https://travis-ci.com/meritoo/common-library.svg?branch=master&style=flat-square)](https://travis-ci.com/meritoo/common-library)
+[![Packagist](https://img.shields.io/packagist/v/meritoo/common-library.svg?style=flat-square)](https://packagist.org/packages/meritoo/common-library)
+[![license](https://img.shields.io/github/license/meritoo/common-library.svg?style=flat-square)](https://github.com/meritoo/common-library)
+[![GitHub commits](https://img.shields.io/github/commits-since/meritoo/common-library/0.0.1.svg?style=flat-square)](https://github.com/meritoo/common-library)
+[![Coverage Status](https://coveralls.io/repos/github/meritoo/common-library/badge.svg?branch=master&style=flat-square)](https://coveralls.io/github/meritoo/common-library)
 
 # Installation
 
+In your `composer.json` add address of repository into `repositories` section:
+
+```json
+"repositories": [
+    (...)
+    {
+        "type": "vcs",
+        "url": "https://github.com/wiosna-dev/common-library"
+    }
+]
+```
+
 Run [Composer](https://getcomposer.org) to install this package in your project:
 
 ```bash
-composer require meritoo/common-library
+composer require wiosna-dev/common-library
 ```
 
 > [How to install Composer?](https://getcomposer.org/download)
@@ -17,9 +34,13 @@ composer require meritoo/common-library
 # Usage
 
 1. [Base test case (with common methods and data providers)](docs/Base-test-case.md)
-2. [Collection of elements](docs/Collection-of-elements.md)
+2. [Collection of elements](docs/Collection/BaseCollection.md)
 3. [Exceptions](docs/Static-methods.md)
 4. [Static methods](docs/Static-methods.md)
+    1. [Arrays](docs/Static-methods/Arrays.md)
+    2. [Regex](docs/Static-methods/Regex.md)
+    3. [Uri](docs/Static-methods/Uri.md)
+5. [Value Objects](docs/Value-Objects.md)
 
 # Development
 

VERSION

@@ -0,0 +1 @@
+1.1.8

build.xml

@@ -1,46 +1,30 @@
 <?xml version="1.0" encoding="UTF-8"?>
+
 <project name="Meritoo Package" basedir="." default="build:main" phingVersion="2.14.0">
     <!-- Properties -->
     <if>
-        <available file="phing/properties" property="custom.properties.available"/>
+        <available file="${project.basedir}/phing/properties" property="custom.properties.available" />
         <then>
-            <property file="phing/properties"/>
+            <property file="${project.basedir}/phing/properties" />
         </then>
         <else>
-            <property file="phing/properties.dist"/>
+            <property file="${project.basedir}/phing/properties.dist" />
         </else>
     </if>
 
     <!-- Default / main target -->
     <target name="build:main"
-            depends="build:app, build:tests"
-            description="Builds everything and runs all tests" />
+            depends="build:app,
+                    build:tests"
+    />
 
     <!-- Build app -->
-    <target name="build:app" description="Prepares app to build and tests">
-        <phing phingfile="phing/app.xml" haltonfailure="true"/>
+    <target name="build:app">
+        <phing phingfile="${project.basedir}/phing/app.xml" haltonfailure="true" />
     </target>
 
     <!-- Build tests -->
-    <target name="build:tests" description="Runs all tests, checks and creates docs">
-        <phing phingfile="phing/tests.xml" haltonfailure="true"/>
-
-        <!--
-        Conditional running of tests.
-        Disabled, because not required.
-
-        Meritoo <github@meritoo.pl>
-        2017-02-22
-
-        <if>
-            <equals arg1="${env}" arg2="test" />
-            <then>
-                <phing phingfile="phing/tests.xml" haltonfailure="true" />
-            </then>
-            <else>
-                <echo message="[Skipped] Running tests, checks and creating docs, because it's a not 'test' environment..." />
-            </else>
-        </if>
-        -->
+    <target name="build:tests">
+        <phing phingfile="${project.basedir}/phing/tests.xml" haltonfailure="true" />
     </target>
 </project>

composer.json

@@ -1,8 +1,7 @@
 {
-    "name": "meritoo/common-library",
+    "name": "wiosna-dev/common-library",
     "description": "Useful classes, methods, extensions etc.",
     "license": "MIT",
-    "version": "0.1.0",
     "authors": [
         {
             "name": "Meritoo.pl",
@@ -11,19 +10,25 @@
         }
     ],
     "require": {
-        "php": ">=5.6",
+        "php": "^7.4 || ^8.0",
+        "ext-dom": "*",
+        "ext-fileinfo": "*",
+        "ext-intl": "*",
+        "ext-json": "*",
         "ext-pcre": "*",
-        "doctrine/orm": "^2.5",
-        "gedmo/doctrine-extensions": "^2.4"
+        "ext-simplexml": "*",
+        "doctrine/orm": "^2.6",
+        "gedmo/doctrine-extensions": "^3.0"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2.2",
-        "pdepend/pdepend": "^2.5",
-        "phploc/phploc": "^2.1",
-        "phpmd/phpmd": "^2.6",
-        "phpunit/phpunit": "^4.8",
-        "sebastian/phpcpd": "^2.0",
-        "squizlabs/php_codesniffer": "^2.9"
+        "friendsofphp/php-cs-fixer": "^3.11",
+        "infection/infection": "^0.26",
+        "php-coveralls/php-coveralls": "^2.5",
+        "phpstan/phpstan": "^1.8",
+        "phpunit/phpunit": "^9",
+        "sebastian/phpcpd": "^6.0",
+        "squizlabs/php_codesniffer": "^3.7",
+        "vimeo/psalm": "^4.0"
     },
     "autoload": {
         "psr-4": {
@@ -32,7 +37,7 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Meritoo\\Common\\Test\\": "tests/"
+            "Meritoo\\Test\\Common\\": "tests/"
         }
     },
     "config": {

docker-compose.yml

@@ -1,20 +1,33 @@
 version: '3'
 
 services:
+    #
+    # Required to run project
+    #
     php:
-        image: ${DOCKER_CONTAINER_OWNER}/${DOCKER_CONTAINER_PROJECT}-php
+        image: meritoo/php:7.4
         container_name: ${DOCKER_CONTAINER_OWNER}-${DOCKER_CONTAINER_PROJECT}-php
         entrypoint: php
         command: -S 0.0.0.0:9999
-        build:
-            context: ./docker/config
-            args:
-                - TIMEZONE=$TIMEZONE
+        environment:
+            PHP_DATE_TIMEZONE: ${PHP_DATE_TIMEZONE}
         volumes:
-            - .:/project
+            - .:/var/www/application:cached
     composer:
-        image: ${DOCKER_CONTAINER_OWNER}/${DOCKER_CONTAINER_PROJECT}-php
+        image: meritoo/php:7.4
         container_name: ${DOCKER_CONTAINER_OWNER}-${DOCKER_CONTAINER_PROJECT}-composer
-        entrypoint: composer
+        entrypoint: php -d memory_limit=-1 /usr/local/bin/composer
         volumes:
-            - .:/project
+            - .:/var/www/application:cached
+    #
+    # Required to run PHPUnit's tests
+    #
+    phpunit:
+        image: meritoo/php:7.4
+        container_name: ${DOCKER_CONTAINER_OWNER}-${DOCKER_CONTAINER_PROJECT}-phpunit
+        entrypoint: ./vendor/bin/phpunit
+        command: --version
+        volumes:
+            - .:/var/www/application:cached
+        environment:
+            XDEBUG_MODE: coverage

docker/config/Dockerfile

@@ -1,131 +0,0 @@
-FROM php:5.6-cli
-MAINTAINER Meritoo <github@meritoo.pl>
-
-#
-# Tools & libraries
-#
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-        vim \
-        git \
-        unzip \
-        libicu-dev \
-        locales \
-    && apt-get clean \
-    && rm -rf \
-        /var/lib/apt/lists/* \
-        /tmp/* \
-        /var/tmp/*
-
-#
-# Generating locales:
-# - de_DE
-# - es_ES
-# - en_GB
-# - en_US
-# - fr_FR
-# - it_IT
-# - pl_PL
-# - ru_RU
-#
-RUN sed -i 's/^# de_DE/de_DE/g; \
-            s/^# es_ES/es_ES/g; \
-            s/^# en_GB/en_GB/g; \
-            s/^# en_US/en_US/g; \
-            s/^# fr_FR/fr_FR/g; \
-            s/^# it_IT/it_IT/g; \
-            s/^# pl_PL/pl_PL/g; \
-            s/^# ru_RU/ru_RU/g;' /etc/locale.gen \
-    && locale-gen
-
-#
-# Set default language
-#
-# Required to avoid problem with using strange language by error messages.
-# Example: "chmod(): Aucun fichier ou dossier de ce type"
-#
-ENV LANGUAGE=en_US.UTF-8
-
-#
-# PHP extensions
-#
-RUN docker-php-ext-install \
-    intl \
-    mbstring
-
-#
-# PHP extensions (PECL):
-# - Xdebug
-#
-RUN pecl install \
-        xdebug-2.5.5 \
-    && docker-php-ext-enable \
-        xdebug
-
-COPY xdebug.ini /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
-
-#
-# PHP configuration:
-# - default configuration
-# - timezone
-#
-COPY php.ini /usr/local/etc/php/php.ini
-ARG TIMEZONE
-RUN ln -snf /usr/share/zoneinfo/${TIMEZONE} /etc/localtime \
-    && echo ${TIMEZONE} > /etc/timezone \
-    && printf '[PHP]\ndate.timezone = "%s"\n' ${TIMEZONE} > /usr/local/etc/php/conf.d/tzone.ini \
-    && "date"
-#RUN echo "\n""date.timezone = $TIMEZONE""\n" >> /usr/local/etc/php/php.ini
-
-#
-# Phing
-#
-RUN pear channel-discover pear.phing.info \
-    && pear install [--alldeps] phing/phing
-
-#
-# Composer - environment variables:
-# - disable warning about running commands as root/super user
-# - disable automatic clearing of sudo sessions
-#
-# More:
-# https://getcomposer.org/doc/03-cli.md#composer-allow-superuser
-#
-ENV COMPOSER_ALLOW_SUPERUSER 1
-
-#
-# Composer + https://packagist.org/packages/hirak/prestissimo package
-#
-RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" \
-    && php -r "if (hash_file('SHA384', 'composer-setup.php') === \
-        '544e09ee996cdf60ece3804abc52599c22b1f40f4323403c44d44fdfdd586475ca9813a858088ffbc1f233e9b180f061') { echo \
-        'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" \
-    && php composer-setup.php --install-dir=/usr/local/bin --filename=composer \
-    && php -r "unlink('composer-setup.php');" \
-    && composer global require \
-        --no-plugins \
-        --no-scripts \
-        --no-progress \
-        --no-suggest \
-        --no-interaction \
-        --prefer-dist \
-        --optimize-autoloader \
-        --classmap-authoritative \
-        hirak/prestissimo \
-    && rm -rf ~/.composer/cache/* \
-    && composer clear-cache \
-    && composer --version
-
-#
-# Bash
-#
-RUN sed -i 's/^# export/export/g; \
-            s/^# alias/alias/g;' ~/.bashrc \
-    && echo 'COLUMNS=200'"\n" >> ~/.bashrc
-
-#
-# Use project-related binaries globally
-#
-ENV PATH="/project/vendor/bin:${PATH}"
-
-WORKDIR /project

docker/config/php.ini

@@ -1,3 +0,0 @@
-display_errors = On
-display_startup_errors = On
-error_reporting = E_ALL

docker/config/xdebug.ini

@@ -1,6 +0,0 @@
-[xdebug]
-zend_extension=xdebug.so
-
-xdebug.remote_enable=1
-xdebug.remote_port=9001
-xdebug.remote_host=10.254.254.254

docs/Base-test-case.md

@@ -4,7 +4,15 @@ Common and useful classes, methods, exceptions etc.
 
 # Base test case (with common methods and data providers)
 
-Located here: `Meritoo\Common\Test\Base\BaseTestCase`. Just extend the `BaseTestCase` class and use it like in `Meritoo\Common\Test\Utilities\DateTest` class:
+Located here: `Meritoo\Common\Test\Base\BaseTestCase`.
+
+##### Usage
+
+1. Just extend the `BaseTestCase` class or implement `Meritoo\Common\Traits\Test\Base\BaseTestCaseTrait` trait.
+2. Use one of available data providers, e.g. `@dataProvider provideEmptyValue`, or asserts,
+   e.g. `static::assertMethodVisibility($method, $visibilityType);`
+
+##### Examples
 
 ```php
 class DateTest extends BaseTestCase
@@ -22,8 +30,6 @@ class DateTest extends BaseTestCase
 }
 ```
 
-or in `Meritoo\Common\Test\Utilities\MimeTypesTest` class:
-
 ```php
 class MimeTypesTest extends BaseTestCase
 {
@@ -45,8 +51,13 @@ class MimeTypesTest extends BaseTestCase
 # More
 
 1. [**Base test case (with common methods and data providers)**](Base-test-case.md)
-2. [Collection of elements](Collection-of-elements.md)
-3. [Exceptions](Exceptions.md)
-4. [Static methods](Static-methods.md)
+2. [Collection of elements](Collection/BaseCollection.md)
+3. [Templates](Collection/Templates.md)
+4. [Exceptions](Exceptions.md)
+5. [Static methods](Static-methods.md)
+    1. [Arrays](Static-methods/Arrays.md)
+    2. [Regex](Static-methods/Regex.md)
+    3. [Uri](Static-methods/Uri.md)
+6. [Value Objects](Value-Objects.md)
 
 [‹ Back to `Readme`](../README.md)

docs/Collection-of-elements.md

@@ -1,50 +0,0 @@
-# Meritoo Common Library
-
-Common and useful classes, methods, exceptions etc.
-
-# Collection of elements
-
-Located here: `Meritoo\Common\Collection\Collection`. It's a set of some elements, e.g. objects. It's iterable and countable. Provides very useful methods. Some of them:
-- `getFirst()` - returns the first element in the collection
-- `getLast()` - returns the last element in the collection
-- `isEmpty()` - returns information if collection is empty
-- `add($element, $index = null)` - adds given element (at the end of collection)
-- `addMultiple($elements, $useIndexes = false)` - adds given elements (at the end of collection)
-- `prepend($element)` - prepends given element (adds given element at the beginning of collection)
-- `remove($element)` - removes given element
-
-Examples of usage below.
-
-### An empty collection
-
-```php
-use Meritoo\Common\Collection\Collection;
-
-$emptyCollection = new Collection();
-var_dump($emptyCollection->isEmpty()); // bool(true)
-```
-
-### Simple collection
-
-```php
-use Meritoo\Common\Collection\Collection;
-
-$elements = [
-    'lorem',
-    'ipsum',
-    123 => 'dolor',
-    345 => 'sit',
-];
-
-$simpleCollection = new Collection($elements);
-var_dump($simpleCollection->has('dolor')); // bool(true)
-```
-
-# More
-
-1. [Base test case (with common methods and data providers)](Base-test-case.md)
-2. [**Collection of elements**](Collection-of-elements.md)
-3. [Exceptions](Exceptions.md)
-4. [Static methods](Static-methods.md)
-
-[‹ Back to `Readme`](../README.md)

docs/Collection/BaseCollection.md

@@ -0,0 +1,90 @@
+# Meritoo Common Library
+
+Common and useful classes, methods, exceptions etc.
+
+# BaseCollection
+
+### Namespace
+
+`Meritoo\Common\Collection\BaseCollection`
+
+### Info
+
+It's a set of some elements with the same type, e.g. objects. It's iterable and countable. Provides very useful methods.
+Some of them:
+
+- `getFirst()` - returns the first element in the collection
+- `getLast()` - returns the last element in the collection
+- `isEmpty()` - returns information if collection is empty
+- `add($element, $index = null)` - adds given element (at the end of collection)
+- `addMultiple($elements, $useIndexes = false)` - adds given elements (at the end of collection)
+- `prepend($element)` - prepends given element (adds given element at the beginning of collection)
+- `remove($element)` - removes given element
+
+### Implementation
+
+You have to implement:
+
+```php
+abstract protected function isValidType($element): bool;
+```
+
+This method verifies 1 element before it will be added to collection. Returns information if the element has valid,
+expected type.
+
+Example (from `Meritoo\Common\Collection\Templates` class):
+
+```php
+protected function isValidType($element): bool
+{
+    return $element instanceof Template;
+}
+```
+
+### Methods to overwrite
+
+You can, if you wish, overwrite these methods:
+
+1. To prepare elements used to initialize the collection in your own way:
+
+    ```php
+    protected function prepareElements(array $elements): array
+    ```
+
+2. To validate type of elements in your own way:
+
+    ```php
+    protected function getElementsWithValidType(array $elements): array
+    ```
+
+### Examples of usage
+
+```php
+use Meritoo\Common\Collection\StringCollection;
+
+$emptyCollection = new StringCollection();
+var_dump($emptyCollection->isEmpty()); // bool(true)
+
+$elements = [
+    'lorem',
+    'ipsum',
+    123 => 'dolor',
+    345 => 'sit',
+];
+
+$simpleCollection = new StringCollection($elements);
+var_dump($simpleCollection->has('dolor')); // bool(true)
+```
+
+# More
+
+1. [Base test case (with common methods and data providers)](../Base-test-case.md)
+2. [**Collection of elements**](BaseCollection.md)
+3. [Templates](Templates.md)
+4. [Exceptions](../Exceptions.md)
+5. [Static methods](../Static-methods.md)
+    1. [Arrays](../Static-methods/Arrays.md)
+    2. [Regex](../Static-methods/Regex.md)
+6. [Value Objects](../Value-Objects.md)
+
+[‹ Back to `Readme`](../../README.md)

docs/Collection/Templates.md

@@ -0,0 +1,67 @@
+# Meritoo Common Library
+
+Common and useful classes, methods, exceptions etc.
+
+# Templates
+
+### Namespace
+
+`Meritoo\Common\Collection\Templates`
+
+### Info
+
+Collection/storage of templates, instance of `Meritoo\Common\ValueObject\Template` class.
+
+##### New instance
+
+New instance can be created using:
+
+1. Constructor:
+
+   ```php
+   new Templates([
+       'first' => new Template('First name: %first_name%'),
+       'last'  => new Template('Last name: %last_name%'),
+   ]);
+   ```
+
+2. Static method `fromArray(array $templates)` - creates and returns the collection from given array
+
+   ```php
+   Templates::fromArray([
+       'first' => 'First name: %first_name%',
+       'last'  => 'Last name: %last_name%',
+   ]);
+   ```
+
+##### Methods
+
+Has all methods of parent class `Meritoo\Common\Collection\Collection` + `findTemplate(string $index)` method that finds
+and returns template with given index.
+
+Example of usage:
+
+```php
+$templates = new Templates([
+	'first' => new Template('First name: %first_name%'),
+    'last'  => new Template('Last name: %last_name%'),
+]);
+
+$template = $templates->findTemplate('first'); // new Template('First name: %first_name%')
+```
+
+Throws an `Meritoo\Common\Exception\ValueObject\Template\TemplateNotFoundException` exception if template with given
+index was not found.
+
+# More
+
+1. [Base test case (with common methods and data providers)](../Base-test-case.md)
+2. [Collection of elements](BaseCollection.md)
+3. [**Templates**](Templates.md)
+4. [Exceptions](../Exceptions.md)
+5. [Static methods](../Static-methods.md)
+    1. [Arrays](../Static-methods/Arrays.md)
+    2. [Regex](../Static-methods/Regex.md)
+6. [Value Objects](../Value-Objects.md)
+
+[‹ Back to `Readme`](../../README.md)

docs/Development.md

@@ -15,11 +15,11 @@ Development-related information
     docker-compose up -d
     ```
 
-2. Install packages by running command:
+2. Rebuild project by running command (installs packages, prepares required directories and runs tests):
 
-    ```bash
-    docker-compose run composer install
-    ```
+   ```bash
+   docker-compose exec php phing
+   ```
 
 > [What is Docker?](https://www.docker.com/what-docker)
 
@@ -28,7 +28,7 @@ Development-related information
 Available as `composer` service. You can run any Composer's command using the `composer` service:
 
 ```bash
-docker-compose run composer <command>
+docker-compose run --rm composer [command]
 ```
 
 Examples below.
@@ -36,25 +36,25 @@ Examples below.
 ##### Install packages
 
 ```bash
-docker-compose run composer install
+docker-compose run --rm composer install
 ```
 
 ##### Update packages
 
 ```bash
-docker-compose run composer update
+docker-compose run --rm composer update
 ```
 
 ##### Add package
 
 ```bash
-docker-compose run composer require <vendor>/<package>
+docker-compose run --rm composer require [vendor]/[package]
 ```
 
 ##### Remove package
 
 ```bash
-docker-compose run composer remove <vendor>/<package>
+docker-compose run --rm composer remove [vendor]/[package]
 ```
 
 # Coding Standards Fixer
@@ -65,6 +65,12 @@ Fix coding standard by running command:
 docker-compose exec php php-cs-fixer fix
 ```
 
+or
+
+```bash
+docker-compose exec php phing -f phing/tests.xml build:fix-coding-standards
+```
+
 Omit cache and run the Fixer from scratch by running command:
 
 ```bash
@@ -77,37 +83,71 @@ docker-compose exec php rm .php_cs.cache && docker-compose exec php php-cs-fixer
 
 ### Prerequisites
 
-Install required packages by running command: `docker-compose run composer install`.
+Install required packages by running command: `docker-compose run --rm composer install`.
+
+### Running [PHPUnit](https://phpunit.de) tests
+
+##### Easy (with code coverage)
+
+```bash
+docker-compose run --rm phpunit --verbose
+```
+
+or
+
+```bash
+docker-compose exec php phing -f phing/tests.xml test:phpunit
+```
+
+##### Quick (without code coverage)
+
+```bash
+docker-compose run --rm phpunit --verbose --no-coverage
+```
+
+# Infection - Mutation Testing
+
+Served by [Infection — Mutation Testing Framework](https://infection.github.io).
 
 ### Running tests
 
-#### Simply & quick, without code coverage
-
-Tests are running using Docker and `php` service defined in `docker-compose.yml`. Example:
-
 ```bash
-docker-compose exec php phpunit --no-coverage
+$ docker-compose exec php bash
+root@18f2f0cfaa5d:/var/www/application# XDEBUG_MODE=coverage ./vendor/bin/infection --threads=$(nproc)
 ```
 
-You can also run them in container. In this case you have to run 2 commands:
-1. Enter container:
-
-    ```bash
-	docker-compose exec php bash
-    ```
-
-2. Run tests:
-
-    ```bash
-    phpunit --no-coverage
-    ```
-
-#### With code coverage
+or
 
 ```bash
-docker-compose exec php phpunit
+$ docker-compose exec php bash
+root@18f2f0cfaa5d:/var/www/application# XDEBUG_MODE=coverage phing -f phing/tests.xml test:infection
 ```
 
+### Result of testing
+
+##### Terminal
+
+Example of output:
+
+```bash
+125 mutations were generated:
+     105 mutants were killed
+       3 mutants were not covered by tests
+       5 covered mutants were not detected
+       0 errors were encountered
+      12 time outs were encountered
+
+Metrics:
+         Mutation Score Indicator (MSI): 93%
+         Mutation Code Coverage: 97%
+         Covered Code MSI: 95%
+```
+
+##### Stored in `build/reports/infection` directory
+
+* `build/reports/infection/infection-log.txt`
+* `build/reports/infection/summary-log.txt`
+
 # Other
 
 Rebuild project and run tests by running command:

docs/Exceptions.md

@@ -6,7 +6,8 @@ Common and useful classes, methods, exceptions etc.
 
 ### Create instance of exception
 
-This package contains a lot of exceptions. Each of them contains static method `create()` with proper arguments that is used to create instance of the exception. Example:
+This package contains a lot of exceptions. Each of them contains static method `create()` with proper arguments that is
+used to create instance of the exception. Example:
 
 ```php
 use Meritoo\Common\Exception\Bundle\IncorrectBundleNameException;
@@ -17,11 +18,14 @@ throw IncorrectBundleNameException::create('RisusIpsum');
 
 ##### Short description
 
-It's a `Meritoo\Common\Exception\Base\UnknownTypeException` class. Related to `Meritoo\Common\Type\Base\BaseType` class that represents type of something, e.g. type of button, order.
+It's a `Meritoo\Common\Exception\Base\UnknownTypeException` class. Related to `Meritoo\Common\Type\Base\BaseType` class
+that represents type of something, e.g. type of button, order.
 
 ##### Usage
 
-You can extend `Meritoo\Common\Exception\Base\UnknownTypeException` class and create your own static method, e.g. `createException()`, which will be used create instance of the exception. Inside the `createException()` method you can call `parent::create()` method.
+You can extend `Meritoo\Common\Exception\Base\UnknownTypeException` class and create your own static method,
+e.g. `createException()`, which will be used create instance of the exception. Inside the `createException()` method you
+can call `parent::create()` method.
 
 ##### Example
 
@@ -54,8 +58,13 @@ class UnknownSimpleTypeException extends UnknownTypeException
 # More
 
 1. [Base test case (with common methods and data providers)](Base-test-case.md)
-2. [Collection of elements](Collection-of-elements.md)
-3. [**Exceptions**](Exceptions.md)
-4. [Static methods](Static-methods.md)
+2. [Collection of elements](Collection/BaseCollection.md)
+3. [Templates](Collection/Templates.md)
+4. [**Exceptions**](Exceptions.md)
+5. [Static methods](Static-methods.md)
+    1. [Arrays](Static-methods/Arrays.md)
+    2. [Regex](Static-methods/Regex.md)
+    3. [Uri](Static-methods/Uri.md)
+6. [Value Objects](Value-Objects.md)
 
 [‹ Back to `Readme`](../README.md)

docs/Static-methods.md

@@ -4,7 +4,8 @@ Common and useful classes, methods, exceptions etc.
 
 # Static methods
 
-This package contains a lot of class with static methods, so usage is not so complicated. Just run the static method who would you like to use. Example:
+This package contains a lot of class with static methods, so usage is not so complicated. Just run the static method who
+would you like to use. Example:
 
 ```php
 use Meritoo\Common\Utilities\Arrays;
@@ -16,8 +17,13 @@ var_dump($firstElement); // string(5) "lorem"
 # More
 
 1. [Base test case (with common methods and data providers)](Base-test-case.md)
-2. [Collection of elements](Collection-of-elements.md)
-3. [Exceptions](Exceptions.md)
-4. [**Static methods**](Static-methods.md)
+2. [Collection of elements](Collection/BaseCollection.md)
+3. [Templates](Collection/Templates.md)
+4. [Exceptions](Exceptions.md)
+5. [**Static methods**](Static-methods.md)
+    1. [Arrays](Static-methods/Arrays.md)
+    2. [Regex](Static-methods/Regex.md)
+    3. [Uri](Static-methods/Uri.md)
+6. [Value Objects](Value-Objects.md)
 
 [‹ Back to `Readme`](../README.md)

docs/Static-methods/Arrays.md

@@ -0,0 +1,109 @@
+# Meritoo Common Library
+
+Common and useful classes, methods, exceptions etc.
+
+# Arrays
+
+> Useful methods related to arrays
+
+Class: `Meritoo\Common\Utilities\Arrays`
+File: `src/Utilities/Arrays.php`
+
+### containsEmptyStringsOnly(array): bool
+
+> Returns information if given array contains an empty strings only
+
+##### Arguments
+
+- `array $array` - The array to verify
+
+##### Examples
+
+1)
+
+- array: `[]` (an empty array)
+- result: `false`
+
+2)
+
+- array: `["", -1]`
+- result: `false`
+
+3)
+
+- array: `["", null, ""]`
+- result: `true`
+
+### getNonEmptyValues(array $values)
+
+> Returns non-empty values, e.g. without "" (empty string), null or []
+
+##### Arguments
+
+- `array $values` - The values to filter
+
+##### Examples
+
+1)
+
+- values: `[]` (no values)
+- result: `[]` (an empty array)
+
+2)
+
+- values: `[null, ""]` (all empty values)
+- result: `[]` (an empty array)
+
+3)
+
+- values: `["test 1", "", 123, null, 0]`
+- result: `["test 1", 123, 0]`
+
+### getNonEmptyValuesAsString(array $values, $separator = ', ')
+
+> Returns non-empty values concatenated by given separator
+
+##### Arguments
+
+- `array $values` - The values to filter
+- `[string $separator]` - (optional) Separator used to implode the values. Default: ", ".
+
+##### Examples
+
+1)
+
+- values: `[]` (no values)
+- separator: default or any other string
+- result: `""` (an empty string)
+
+2)
+
+- values: `[null, ""]` (all empty values)
+- separator: default or any other string
+- result: `""` (an empty string)
+
+3)
+
+- values: `["test 1", "", 123, null, 0]`
+- separator: `", "` (default)
+- result: `"test 1, 123, 0"`
+
+4)
+
+- values: `["test 1", "", 123, null, 0]`
+- separator: `" | "`
+- result: `"test 1 | 123 | 0"`
+
+# More
+
+1. [Base test case (with common methods and data providers)](../Base-test-case.md)
+2. [Collection of elements](../Collection/BaseCollection.md)
+3. [Templates](../Collection/Templates.md)
+4. [Exceptions](../Exceptions.md)
+5. [Static methods](../Static-methods.md)
+    1. [**Arrays**](Arrays.md)
+    2. [Regex](Regex.md)
+    3. [Uri](Uri.md)
+6. [Value Objects](../Value-Objects.md)
+
+[‹ Back to `Readme`](../../README.md)

docs/Static-methods/Regex.md

@@ -0,0 +1,99 @@
+# Meritoo Common Library
+
+Common and useful classes, methods, exceptions etc.
+
+# Regex
+
+> Useful methods related to regular expressions
+
+Class: `Meritoo\Common\Utilities\Regex`
+File: `src/Utilities/Regex.php`
+
+### createSlug($value)
+
+> Returns slug for given value
+
+##### Arguments
+
+- `string $value` - Value that should be transformed to slug
+
+##### Examples
+
+1)
+
+- value: non-scalar or `null`
+- result: `false`
+
+2)
+
+- value: `""` (an empty string)
+- result: `""` (an empty string)
+
+3)
+
+- value: `"Lorem ipsum. Dolor sit 12.34 amet."`
+- result: `"lorem-ipsum-dolor-sit-1234-amet"`
+
+### clearBeginningSlash(string): string
+
+> Clears, removes slash from the beginning of given string
+
+##### Arguments
+
+- `string $string` - String that may contains slash as the 1st character
+
+##### Examples
+
+1)
+
+- string: `"lorem ipsum"`
+- result: `"lorem ipsum"`
+
+2)
+
+- string: `"/lorem ipsum"`
+- result: `"lorem ipsum"`
+
+3)
+
+- string: `"/ lorem 123 ipsum"`
+- result: `" lorem 123 ipsum"`
+
+### clearEndingSlash(string): string
+
+> Clears, removes slash from the end of given string
+
+##### Arguments
+
+- `string $string` - String that may contains slash as the last character
+
+##### Examples
+
+1)
+
+- string: `"lorem ipsum"`
+- result: `"lorem ipsum"`
+
+2)
+
+- string: `"lorem ipsum/"`
+- result: `"lorem ipsum"`
+
+3)
+
+- string: `"lorem 123 ipsum /"`
+- result: `"lorem 123 ipsum "`
+
+# More
+
+1. [Base test case (with common methods and data providers)](../Base-test-case.md)
+2. [Collection of elements](../Collection/BaseCollection.md)
+3. [Templates](../Collection/Templates.md)
+4. [Exceptions](../Exceptions.md)
+5. [Static methods](../Static-methods.md)
+    1. [Arrays](../Static-methods/Arrays.md)
+    2. [**Regex**](Regex.md)
+    3. [Uri](Uri.md)
+6. [Value Objects](../Value-Objects.md)
+
+[‹ Back to `Readme`](../../README.md)

docs/Static-methods/Uri.md

@@ -0,0 +1,47 @@
+# Meritoo Common Library
+
+Common and useful classes, methods, exceptions etc.
+
+# Uri
+
+> Useful methods related to uri
+
+Class: `Meritoo\Common\Utilities\Uri`
+File: `src/Utilities/Uri.php`
+
+### buildUrl(string, string ...): string
+
+> Builds url with given root url and parts of url (concatenates them using "/")
+
+##### Arguments
+
+- `string $rootUrl` - Protocol and domain (or domain only)
+- `string ...$urlParts` - Parts of url that will be concatenated with the rool url by "/"
+
+##### Examples
+
+1)
+
+- rootUrl: `"http://my.example"`
+- urlParts: `""` (an empty string)
+- result: `"http://my.example"`
+
+2)
+
+- rootUrl: `"http://my.example"`
+- urlParts: `"/test", "/123"`
+- result: `"http://my.example/test/123"`
+
+# More
+
+1. [Base test case (with common methods and data providers)](../Base-test-case.md)
+2. [Collection of elements](../Collection/BaseCollection.md)
+3. [Templates](../Collection/Templates.md)
+4. [Exceptions](../Exceptions.md)
+5. [Static methods](../Static-methods.md)
+    1. [Arrays](Arrays.md)
+    2. [Regex](Regex.md)
+    3. [**Uri**](Uri.md)
+6. [Value Objects](../Value-Objects.md)
+
+[‹ Back to `Readme`](../../README.md)

docs/Value-Objects.md

@@ -0,0 +1,365 @@
+# Meritoo Common Library
+
+Common and useful classes, methods, exceptions etc.
+
+# Value Objects
+
+Located in `Meritoo\Common\ValueObject` namespace and in `src/ValueObject/` directory.
+
+### Address
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\Address`
+
+##### Info
+
+Represents address of company, institution, user etc. Contains properties:
+
+1. `$street` - the street
+2. `$buildingNumber` - the number of building
+3. `$flatNumber` - the number of flat
+4. `$zipCode` - the zip code
+5. `$city` - the city, location
+
+##### New instance
+
+New instance can be created using constructor
+
+```php
+new Address('New York', '00123', '4th Avenue', '10', '200');
+```
+
+##### Methods
+
+Has getters for each property, e.g. `getFlatNumber()` or `getZipCode()`, and 1 extra method:
+
+```php
+getFullStreet()
+```
+
+that returns name of street with related numbers (building & flat number).
+
+Example:
+
+```php
+$address = new Address('New York', '00123', '4th Avenue', '10', '200');
+$fullStreet = $address->getFullStreet(); // "4th Avenue 10/200"
+```
+
+##### Conversion to string (the `__toString()` method)
+
+Instance of `Address` may be represented as string that contains all non-empty properties separated by `, `.
+
+Example:
+
+```php
+$address = new Address('New York', '00123', '4th Avenue', '10', '200');
+$asString = (string)$address; // "4th Avenue 10/200, 00123, New York"
+```
+
+### BankAccount
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\BankAccount`
+
+##### Info
+
+Represents bank account. Contains properties:
+
+1. `$bankName` - name of bank
+2. `$accountNumber` - number of bank's account
+
+##### New instance
+
+New instance can be created using constructor
+
+```php
+new BankAccount('Bank of America', '1234567890')
+```
+
+##### Methods
+
+Has getters for each property `getBankName()` and `getAccountNumber()`.
+
+##### Conversion to string (the `__toString()` method)
+
+Instance of `BankAccount` may be represented as string that contains all non-empty properties separated by `, `.
+
+Example:
+
+```php
+$bank = new BankAccount('Bank of America', '1234567890');
+$asString = (string)$bank; // "Bank of America, 1234567890"
+```
+
+### Company
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\Company`
+
+##### Info
+
+Represents a company. Contains properties:
+
+1. `$name` - name of company
+2. `$address` - address of company
+3. `$bankAccount` - bank account of company
+
+##### New instance
+
+New instance can be created using constructor:
+
+```php
+new Company(
+    'Test 1',
+    new Address('New York', '00123', '4th Avenue', '10', '200'),
+    new BankAccount('Bank 1', '12345')
+);
+```
+
+##### Methods
+
+Has getters for each property `getName()`, `getAddress()` and `getBankAccount()`.
+
+##### Conversion to string (the `__toString()` method)
+
+Instance of `Company` may be represented as string that contains all non-empty properties separated by `, `.
+
+Example:
+
+```php
+$company = new Company(
+    'Test 1',
+    new Address('New York', '00123', '4th Avenue', '10', '200'),
+    new BankAccount('Bank 1', '12345')
+);
+
+$asString = (string)$company; // "Test 1, 4th Avenue 10/200, 00123, New York, Bank 1, 12345"
+```
+
+### Human
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\Human`
+
+##### Info
+
+Represents human. Based on `\Meritoo\Common\Traits\ValueObject\HumanTrait` trait. Contains properties same
+as `HumanTrait` trait:
+
+1. `$firstName` - first name
+2. `$lastName` - last name
+3. `$email` - email address
+4. `$birthDate` - birth date
+
+##### New instance
+
+New instance can be created using constructor:
+
+```php
+new Human('John', 'Scott', 'john@scott.com', new \DateTime('2001-01-01'));
+```
+
+##### Methods
+
+Has getters for each property, e.g. `getFirstName()`, `getEmail()` etc.
+
+##### Conversion to string (the `__toString()` method)
+
+Instance of `Human` may be represented as string that contains first name, last name and email address (if provided).
+
+Example:
+
+```php
+$human1 = new Human('John', 'Scott');
+$asString1 = (string)$human1; // "John Scott"
+
+$human2 = new Human('John', 'Scott', 'john@scott.com', new \DateTime('2001-01-01'));
+$asString2 = (string)$human2; // "John Scott <john@scott.com>"
+```
+
+### Size
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\Size`
+
+##### Info
+
+Size, e.g. of image. Contains properties:
+
+1. `width` - the width
+2. `height` - the height
+3. `unit` - unit used when width or height should be returned with unit, default: `"px"`
+4. `separator` - separator used when converting to string, default: `" x "`
+
+##### New instance
+
+New instance can be created using static methods:
+
+1. `fromArray()` - creates new instance from given array
+
+    ```php
+    // Using default "px" unit
+    Size::fromArray([200, 100]);
+
+    // With custom "mm" unit
+    Size::fromArray([200, 100], 'mm');
+    ```
+
+2. `fromString()` - creates new instance from given string
+
+    ```php
+    // Using default "px" unit and default " x " separator
+    Size::fromString('200 x 100');
+
+	// With custom "mm" unit and " X " separator
+    Size::fromString('200 X 100', 'mm', ' X ');
+    ```
+
+##### Methods
+
+Has:
+
+- getters and setters for `width` and `height` properties.
+- setter for `separator` property
+- `toString()` and `toArray()` methods that returns size represented as string and array
+
+##### Conversion to string (using `__toString()` method)
+
+Instance of `Size` may be represented as string that contains width and height separated by separator (default: `" x "`)
+.
+
+Example:
+
+```php
+$size = Size::fromArray([200, 100]);
+
+// With default separator
+$asString1 = (string)$size; // "200 x 100"
+
+// With custom separator
+$size->setSeparator('X');
+$asString2 = (string)$size; // "200X100"
+```
+
+### Template
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\Template`
+
+##### Info
+
+Template with placeholders that may be filled by real data. Contains properties:
+
+1. `$content` - raw string with placeholders (content of the template)
+
+##### New instance
+
+New instance can be created using constructor:
+
+```php
+new Template('First name: %first_name%');
+```
+
+Each placeholder should be wrapped by `%` character, e.g. `%first_name%`. If content of template is an empty string or
+does not contain 1 placeholder at least, an `Meritoo\Common\Exception\ValueObject\Template\InvalidContentException`
+exception will be thrown.
+
+Examples of invalid content of template:
+
+```php
+new Template(''); // An empty string
+new Template('test'); // Without placeholders
+new Template('This is %test'); // With starting tag only (invalid placeholder)
+```
+
+##### Methods
+
+Has 1 public method: `fill(array $values)`. Returns content of the template filled with given values (by replacing
+placeholders with their proper values).
+
+Example of usage:
+
+```php
+$template = new Template('My name is %name% and I am %profession%');
+$result = $template->fill([
+	'name'       => 'Jane',
+    'profession' => 'photographer',
+]); // "My name is Jane and I am photographer"
+```
+
+Throws an `Meritoo\Common\Exception\ValueObject\Template\NotEnoughValuesException` exception if there is not enough
+values (iow. more placeholders than values).
+
+### Version
+
+##### Namespace
+
+`Meritoo\Common\ValueObject\Version`
+
+##### Info
+
+Represents version of software. Contains properties:
+
+1. `$majorPart` - the "major" part of version
+2. `$minorPart` - the "minor" part of version
+3. `$patchPart` - the "patch" part of version
+
+##### New instance
+
+New instance can be created using:
+
+1. Constructor:
+
+   ```php
+   new Version(1, 0, 2);
+   ```
+
+2. Static methods:
+    1. `fromArray(array $version)` - creates new instance using given version as array
+
+   ```php
+   Version::fromArray([1, 0, 2]);
+   ```
+
+    2. `fromString(string $version)` - creates new instance using given version as string:
+
+   ```php
+   Version::fromString('1.0.2');
+   ```
+
+##### Methods
+
+Has getters for each property: `getMajorPart()`, `getMinorPart()`, `getPatchPart()`.
+
+##### Conversion to string (using `__toString()` method)
+
+Instance of `Version` may be represented as string that contains all properties separated by `.` (`$majorPart`
+.`$minorPart`.`$patchPart`).
+
+Example:
+
+```php
+$version = new Version(1, 0, 2);
+$asString = (string)$version; // "1.0.2"
+```
+
+# More
+
+1. [Base test case (with common methods and data providers)](Base-test-case.md)
+2. [Collection of elements](Collection/BaseCollection.md)
+3. [Templates](Collection/Templates.md)
+4. [Exceptions](Exceptions.md)
+5. [Static methods](Static-methods.md)
+    1. [Arrays](Static-methods/Arrays.md)
+    2. [Regex](Static-methods/Regex.md)
+    3. [Uri](Static-methods/Uri.md)
+6. [**Value Objects**](Value-Objects.md)
+
+[&lsaquo; Back to `Readme`](../README.md)

infection.json.dist

@@ -0,0 +1,13 @@
+{
+    "timeout": 10,
+    "source": {
+        "directories": [
+            "src"
+        ]
+    },
+    "logs": {
+        "text": "build/reports/infection/infection-log.txt",
+        "summary": "build/reports/infection/summary-log.txt",
+        "debug": "build/reports/infection/debug-log.txt"
+    }
+}

phing/app.xml

@@ -1,88 +1,169 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project name="Meritoo Package" basedir="." default="build:main" phingVersion="2.14.0">
+
+<project name="Meritoo Package" basedir="." default="build:main" phingVersion="2.16.0">
     <!-- Properties -->
     <if>
-        <available file="phing/properties" property="custom.properties.available"/>
+        <available file="${project.basedir}/phing/properties" property="custom.properties.available" />
         <then>
-            <property file="phing/properties"/>
+            <property file="${project.basedir}/phing/properties" />
         </then>
         <else>
-            <property file="phing/properties.dist"/>
+            <property file="${project.basedir}/phing/properties.dist" />
         </else>
     </if>
 
+    <!-- Filesets -->
+    <import file="${project.basedir}/phing/filesets.xml" />
+
     <!-- Default / main target -->
     <target name="build:main"
             depends="build:app"
-            description="Builds the application" />
+    />
 
     <!-- App target -->
     <target name="build:app"
-            depends="app:composer, app:vendors, app:checkout"
-            description="Prepares app to build." />
-
-    <!-- Updates Composer and validates composer.* files -->
-    <target name="app:composer" description="Updates Composer and validates composer.* files">
-        <echo msg="Updating Composer and validating composer.* files..." />
+            depends="app:clean,
+                    app:composer:self-update,
+                    app:composer:install,
+                    app:composer:validate,
+                    app:checkout"
+    />
 
+    <!-- Updates Composer -->
+    <target name="app:composer:self-update">
         <if>
-            <available file="composer.phar" />
+            <not>
+                <available file="${composer.path}" property="composer.local.unavailable" />
+            </not>
             <then>
-                <echo msg="[Skipped] Downloading of Composer skipped, because exist in the project..." />
-            </then>
-            <else>
                 <if>
                     <os family="windows" />
                     <then>
                         <fail message="Composer not found! Go to http://getcomposer.org/download and download the Composer." />
                     </then>
                     <else>
-                        <exec command="${composer.download_command}" checkreturn="true" />
+                        <exec command="${composer.download_command}" checkreturn="true" passthru="true" />
                     </else>
                 </if>
-            </else>
+            </then>
         </if>
 
         <!-- Update Composer -->
-        <composer command="selfupdate" />
-
-        <!-- Validate Composer -->
-        <composer command="validate">
-            <arg line="--no-check-all --strict" />
+        <composer php="${composer.php}" composer="${composer.path}" command="selfupdate">
+            <arg value="--ansi" />
         </composer>
     </target>
 
-    <!-- Project Install/update vendors -->
-    <target name="app:vendors" description="Installs / updates vendors">
-        <echo msg="Installing / updating vendors..." />
-
-        <if>
-            <istrue value="${composer.self-update}"/>
-            <then>
-                <composer php="${composer.php}" composer="${composer.path}" command="self-update"/>
-            </then>
-        </if>
-
-        <if>
-            <istrue value="${composer.validate}"/>
-            <then>
-                <composer php="${composer.php}" composer="${composer.path}" command="validate"/>
-            </then>
-        </if>
+    <!-- Validates composer.* files -->
+    <target name="app:composer:validate" depends="app:composer:install">
+        <composer php="${composer.php}" composer="${composer.path}" command="validate">
+            <arg value="--no-check-all" />
+            <arg value="--strict" />
+            <arg value="--ansi" />
+        </composer>
+    </target>
 
+    <!-- Project clean -->
+    <target name="app:clean">
         <if>
             <equals arg1="${env}" arg2="prod" />
             <then>
-                <composer php="${composer.php}" composer="${composer.path}" command="install">
-                    <arg value="--optimize-autoloader" />
-                    <arg value="--prefer-dist" />
-                    <arg value="--classmap-authoritative" />
-                </composer>
+                <echo message="[Skipped] Cleaning project (and directories cleanup) -> 'prod' environment" />
             </then>
             <else>
-                <composer php="${composer.php}" composer="${composer.path}" command="install" />
+                <foreach list="${directoriesToEmpty}" param="directory" target="app:clean:empty" />
             </else>
         </if>
+
+        <foreach list="${directoriesToCheck}" param="directory" target="app:clean:check" />
+        <foreach list="${directoriesToEmpty}" param="directory" target="app:permissions" />
+    </target>
+
+    <!-- Cleaning directory (making empty) directory -->
+    <target name="app:clean:empty">
+        <if>
+            <available file="${directory}" type="dir" property="dir_is_available" />
+            <then>
+                <delete includeemptydirs="true" dir="${directory}" />
+            </then>
+        </if>
+    </target>
+
+    <!-- Checking if directory exists -->
+    <target name="app:clean:check">
+        <if>
+            <not>
+                <available file="${directory}" type="dir" property="dir_is_available" />
+            </not>
+            <then>
+                <if>
+                    <or>
+                        <contains string="${directory}" substring="cache" />
+                        <contains string="${directory}" substring="logs" />
+                        <contains string="${directory}" substring="sessions" />
+                    </or>
+                    <then>
+                        <mkdir dir="${directory}" mode="0777" />
+                    </then>
+                    <else>
+                        <mkdir dir="${directory}" mode="0775" />
+                    </else>
+                </if>
+            </then>
+        </if>
+    </target>
+
+    <!-- Installs vendors -->
+    <target name="app:composer:install" depends="app:composer:self-update">
+        <composer php="${composer.php}" composer="${composer.path}" command="install">
+            <arg value="--optimize-autoloader" />
+            <arg value="--ansi" />
+        </composer>
+    </target>
+
+    <!-- Clearing cache -->
+    <target name="app:cache">
+        <if>
+            <istrue value="${cache.clearWithWarmup}" />
+            <then>
+                <SymfonyConsole console="bin/console" command="cache:clear">
+                    <arg name="env" value="${env}" />
+                </SymfonyConsole>
+            </then>
+            <else>
+                <SymfonyConsole console="bin/console" command="cache:clear">
+                    <arg name="env" value="${env}" />
+                    <arg name="no-warmup" />
+                </SymfonyConsole>
+            </else>
+        </if>
+    </target>
+
+    <!-- Clearing cache (faster) -->
+    <target name="app:cache:faster">
+        <SymfonyConsole console="bin/console" command="cache:clear">
+            <arg name="env" value="${env}" />
+            <arg name="no-optional-warmers" />
+        </SymfonyConsole>
+    </target>
+
+    <!-- Warming up cache -->
+    <target name="app:cache:warmup">
+        <SymfonyConsole console="bin/console" command="cache:warmup">
+            <arg name="env" value="${env}" />
+        </SymfonyConsole>
+    </target>
+
+    <!-- Setting permissions of given directory -->
+    <target name="app:permissions">
+        <if>
+            <not>
+                <os family="windows" />
+            </not>
+            <then>
+                <exec command="chmod -R 777 ${directory}/*" />
+            </then>
+        </if>
     </target>
 
     <!-- Checkout and finalization -->

phing/composer-install.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+EXPECTED_SIGNATURE="$(curl -L https://composer.github.io/installer.sig)"
+# Original line (with wget):
+# EXPECTED_SIGNATURE="$(wget -q -O - https://composer.github.io/installer.sig)"
+
+php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+ACTUAL_SIGNATURE="$(php -r "echo hash_file('SHA384', 'composer-setup.php');")"
+
+if [[ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]]
+then
+    >&2 echo 'ERROR: Invalid installer signature'
+    rm composer-setup.php
+    exit 1
+fi
+
+php composer-setup.php --quiet
+RESULT=$?
+rm composer-setup.php
+exit ${RESULT}

phing/filesets.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project name="Meritoo Package" basedir="." default="build:main" phingVersion="2.16.0">
+    <!-- Directories to check -->
+    <property name="directoriesToCheck" value="
+        ${dir.data.tests},
+        ${dir.data.temporary}"
+    />
+
+    <!-- Directories to empty -->
+    <property name="directoriesToEmpty" value="
+        ${dir.data.temporary}"
+    />
+</project>

phing/properties.dist

@@ -1,19 +1,3 @@
-# --------------------------------------------------------------------------------
-# Information
-# --------------------------------------------------------------------------------
-
-# Property files contain key/value pairs
-# key = value
-#
-# Property keys may contain alphanumeric chars and colons, but
-# not special chars. This way you can create pseudo-namespaces
-#
-# You can refer to values of other properties by enclosing their keys in "${}".
-# Example: dir.js = ${dir.web}/js
-#
-# Everything behind the equal sign is the value, you do
-# not have to enclose strings: text=This is some text, Your OS is ${php.os}
-
 # --------------------------------------------------------------------------------
 # Common, e.g. default environment
 # --------------------------------------------------------------------------------
@@ -22,10 +6,6 @@
 #
 env = dev
 
-# Install assets using symlinks
-#
-assets.installWithSymlink = true
-
 # Clear cache with the "warmup" option
 #
 # The cache:clear command should always be called with the --no-warmup option. Warmup should be done via the cache:warmup command.
@@ -40,67 +20,70 @@ cache.clearWithWarmup = false
 # Composer
 # --------------------------------------------------------------------------------
 
-composer.download_command = php -r "eval('?>'.file_get_contents('https://getcomposer.org/installer'));"
-
-# Path to composer executable or composer.phar file
+# Command used to download Composer
 #
-composer.path = composer.phar
-#composer.path = /usr/local/bin/composer
+composer.download_command = bash ${project.basedir}/phing/composer-install.sh
 
-# Path to php executable used by composer
+# Path to Composer executable or downloaded composer.phar file
+#
+composer.path = ${project.basedir}/composer.phar
+
+# Path to PHP executable used by Composer
 #
 composer.php = php
 
-# Self update of the composer
-#
-composer.self-update = false
-
-# Validate the composer.json file
-#
-composer.validate = false
-
 # --------------------------------------------------------------------------------
 # Directories
 # --------------------------------------------------------------------------------
 
 # System directories
 #
-dir.data = ${project.basedir}/data
 dir.src = ${project.basedir}/src
+dir.data = ${project.basedir}/data
 dir.tests = ${project.basedir}/tests
 
-# --------------------------------------------------------------------------------
 # Build directories
-# --------------------------------------------------------------------------------
-
+#
 dir.build = ${project.basedir}/build
-dir.reports = ${dir.build}/logs
-dir.reports.pdepend = ${dir.reports}/pdepend
-dir.reports.coverage = ${dir.reports}/phpunit_coverage
-#
-# Disabled, because unnecessary right now
-# phpdocumentor/phpdocumentor cannot be installed via Composer
-#
-# Meritoo <github@meritoo.pl>
-# 2017-02-22
-#
-#dir.docs = ${dir.build}/docs
-#dir.docs.phpdoc2 = ${dir.docs}/phpdoc2
+dir.reports = ${dir.build}/reports
+dir.reports.coverage = ${dir.reports}/phpunit-coverage
+dir.reports.code_sniffer = ${dir.reports}/code_sniffer
 
-# --------------------------------------------------------------------------------
 # Data directories
+#
+dir.data.tests = ${dir.data}/tests
+dir.data.temporary = ${dir.data}/tmp
+
+# --------------------------------------------------------------------------------
+# Static Analysis
 # --------------------------------------------------------------------------------
 
-dir.data.temporary = ${dir.data}/tmp
+# Paths of frameworks used to run analysis:
+# - PHPStan
+#
+check.phpstan.command = ./vendor/bin/phpstan analyse
+check.psalm.command = ./vendor/bin/psalm --report=build/reports/psalm.json
+check.php_coveralls.command = ./vendor/bin/php-coveralls --ansi -v
 
 # --------------------------------------------------------------------------------
 # Testing
 # --------------------------------------------------------------------------------
 
-# Path of the framework used to run unit tests
-#
-tests.framework.path = ./vendor/bin/phpunit --verbose --no-coverage --testdox
-
 # Path of the PHP Coding Standards Fixer (http://cs.sensiolabs.org)
 #
-phpCsFixer.path = ./vendor/bin/php-cs-fixer
+tests.cs_fixer.command = ./vendor/bin/php-cs-fixer fix --verbose
+
+# Path of the PHP_CodeSniffer (https://github.com/squizlabs/PHP_CodeSniffer)
+#
+tests.code_sniffer.command = ./vendor/bin/phpcs --report-full=${dir.reports.code_sniffer}/full.txt --report-summary=${dir.reports.code_sniffer}/summary.txt --report-checkstyle=${dir.reports.code_sniffer}/checkstyle.xml
+
+# Test database path
+#
+tests.database = ${dir.data.temporary}/database.sqlite
+
+# Paths of frameworks used to run tests:
+# - PHPUnit (unit tests)
+# - Infection (mutation tests)
+#
+tests.phpunit.command = ./vendor/bin/phpunit --verbose
+tests.mutation.command = ./vendor/bin/infection --ansi --threads=$(nproc) --coverage=build/reports/infection

phing/tests.xml

@@ -1,22 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project name="Meritoo Package" basedir="." default="build:main" phingVersion="2.14.0">
-    <!--
-    The AutoloaderTask is required to load binaries installed by Composer.
-    The "autoloaderpath" attribute of this task is not required, because it's default value is: vendor/autoload.php.
 
-    Meritoo <github@meritoo.pl>
-    2017-02-23
-    -->
+<project name="Meritoo Package" basedir="." default="build:main" phingVersion="2.16.0">
     <autoloader />
 
     <!-- Properties -->
     <if>
-        <available file="phing/properties" property="custom.properties.available"/>
+        <available file="${project.basedir}/phing/properties" property="custom.properties.available" />
         <then>
-            <property file="phing/properties"/>
+            <property file="${project.basedir}/phing/properties" />
         </then>
         <else>
-            <property file="phing/properties.dist"/>
+            <property file="${project.basedir}/phing/properties.dist" />
         </else>
     </if>
 
@@ -35,186 +29,85 @@
 
     <!-- Default / main target -->
     <target name="build:main"
-            depends="build:fix-coding-standards, build:clean, build:prepare, build:check, build:test, app:checkout"
-            description="Runs all tests and builds everything" />
-    <!--
-    Before:
-    depends="build:fix-coding-standards, build:clean, build:prepare, build:check, build:test, build:doc, app:checkout"
-
-    After:
-    depends="build:fix-coding-standards, build:clean, build:prepare, build:check, build:test, app:checkout"
-
-    The "build:doc" task is disabled, because it cannot be installed via Composer:
-    a) phpdocumentor/phpdocumentor v2.9.0 requires symfony/validator ~2.2
-    b) symfony/validator ~2.2 causes to remove symfony/symfony 3.*
-
-    Meritoo <github@meritoo.pl>
-    2017-02-22
-    -->
+            depends="build:fix-coding-standards,
+                    build:check,
+                    build:test,
+                    app:checkout"
+    />
 
     <!-- Fixing coding standards using the PHP Coding Standards Fixer (http://cs.sensiolabs.org) -->
-    <target name="build:fix-coding-standards" description="Fixes coding standards using the PHP Coding Standards Fixer">
-        <echo msg="Fixing coding standards using the PHP Coding Standards Fixer (http://cs.sensiolabs.org)..." />
-
-        <!--
-        Attention.
-        Rules for formatting are defined in /.php_cs.dist file.
-        -->
-
-        <exec
-            passthru="true"
-            command="${phpCsFixer.path} fix --verbose"
-        />
+    <target name="build:fix-coding-standards">
+        <exec command="${tests.cs_fixer.command}" passthru="true" />
     </target>
 
-    <!-- Doc target -->
-    <!--
-    Disabled, because it cannot be installed via Composer:
-    a) phpdocumentor/phpdocumentor v2.9.0 requires symfony/validator ~2.2
-    b) symfony/validator ~2.2 causes to remove symfony/symfony 3.*
-
-    Meritoo <github@meritoo.pl>
-    2017-02-22
-    -->
-    <!--<target name="build:doc"-->
-            <!--depends="build:prepare, doc:phpdoc2"-->
-            <!--description="Generates API documentation" />-->
-
     <!-- Check target -->
     <target name="build:check"
-            depends="check:cs, check:md, check:cpd, check:depend, check:loc"
-            description="Analyzes code" />
+            depends="check:cs,
+                    check:cpd,
+                    check:phpstan,
+                    check:psalm,
+                    check:coveralls"
+    />
 
     <!-- Test target -->
     <target name="build:test"
-            depends="test:unit"
-            description="Executes all tests" />
+            depends="test:phpunit,
+                    test:infection"
+    />
 
-    <!-- Project build clean -->
-    <target name="build:clean" description="Cleans up build directories">
-        <echo msg="Cleaning docs and reports directories..." />
-        <!--<delete dir="${dir.docs}" />-->
-        <delete dir="${dir.reports}" />
-    </target>
-
-    <!-- Project build prepare -->
-    <target name="build:prepare" description="Create build directories">
-        <echo msg="Creating build directories..." />
-        <!--<mkdir dir="${dir.docs}" />-->
-        <!--<mkdir dir="${dir.docs.phpdoc2}" />-->
-        <mkdir dir="${dir.reports}" />
-        <mkdir dir="${dir.reports.pdepend}" />
-        <mkdir dir="${dir.reports.coverage}"/>
-    </target>
-
-    <!-- PHPDocumentor2 API documentation target -->
-    <!--
-    Disabled, because it cannot be installed via Composer:
-    a) phpdocumentor/phpdocumentor v2.9.0 requires symfony/validator ~2.2
-    b) symfony/validator ~2.2 causes to remove symfony/symfony 3.*
-
-    Meritoo <github@meritoo.pl>
-    2017-02-22
-
-    <target name="doc:phpdoc2" description="Generates API documentations">
-        <echo msg="Generating API Documentation with phpDocumentor 2..." />
-        <phpdoc2 title="${phing.project.name}"
-                 destdir="${dir.docs.phpdoc2}"
-                 template="responsive">
-            <fileset refid="sourcecode" />
-        </phpdoc2>
-    </target>
-    -->
-
-    <!-- Symfony2 code sniffer -->
-    <!--
-    Attention 1.
-    To use Symfony2 standards to check coding you have to:
-    copy, symlink or check out repo to a folder called Symfony2 inside the phpcs Standards directory.
-
-    Example:
-    $ pear config-show | grep php_dir
-    $ cd /path/to/pear/PHP/CodeSniffer/Standards
-    $ git clone git://github.com/opensky/Symfony2-coding-standard.git Symfony2
-
-    Attention 2.
-    PSR2 standard is used instead of Symfony2 standard, because after installation squizlabs/php_codesniffer package
-    via Composer the Symfony2 standard is not included / available in this package. In this case the PHP Coding
-    Standards Fixer (http://cs.sensiolabs.org) is used.
-
-    Meritoo <github@meritoo.pl>
-    2017-02-22
-    -->
-    <target name="check:cs" description="Checks coding standard">
-        <echo msg="Checking coding standard..." />
-        <phpcodesniffer standard="PSR2" showWarnings="true">
-            <fileset refid="sourcecode" />
-            <formatter type="checkstyle" outfile="${dir.reports}/checkstyle.xml" />
-            <formatter type="csv" outfile="${dir.reports}/checkstyle.csv" />
-            <formatter type="summary" outfile="${dir.reports}/checkstyle_summary.txt" />
-        </phpcodesniffer>
+    <!-- PHP_CodeSniffer -->
+    <target name="check:cs" depends="build:prepare">
+        <exec command="${tests.code_sniffer.command}" passthru="true" />
     </target>
 
     <!-- copy/paste detector -->
-    <target name="check:cpd" description="Checks similar code blocks.">
-        <echo msg="Checking similar code blocks..." />
+    <target name="check:cpd" depends="build:prepare">
         <phpcpd>
             <fileset refid="sourcecode" />
-            <formatter type="pmd" outfile="${dir.reports}/pmd-cpd.xml" />
+            <formatter type="pmd" outfile="${dir.reports}/copy-paste-detector.xml" />
         </phpcpd>
-
-        <!--
-        Previous / old version
-
-        Meritoo <github@meritoo.pl>
-        2017-02-22
-
-        <exec command="phpcpd \-\-log-pmd=${dir.reports}/pmd-cpd.xml ${dir.src}" />
-        -->
     </target>
 
-    <!-- Mess detector -->
-    <target name="check:md" description="Generate code metrics">
-        <echo msg="Generating code metrics..." />
-        <phpmd rulesets="codesize,controversial,design,naming,unusedcode">
-            <fileset refid="sourcecode" />
-            <formatter type="html" outfile="${dir.reports}/phpmd.html" />
-            <formatter type="text" outfile="${dir.reports}/phpmd.txt" />
-        </phpmd>
+    <!-- Run static analysis -->
+    <target name="check:phpstan" depends="build:prepare">
+        <exec command="${check.phpstan.command}" passthru="true" />
     </target>
 
-    <!-- Code dependency -->
-    <target name="check:depend" description="Checks coupling and dependency">
-        <echo msg="Checking coupling and dependency..." />
-        <phpdepend>
-            <fileset refid="sourcecode" />
-            <logger type="jdepend-xml" outfile="${dir.reports.pdepend}/jdepend.xml" />
-            <logger type="jdepend-chart" outfile="${dir.reports.pdepend}/dependencies.svg" />
-            <logger type="overview-pyramid" outfile="${dir.reports.pdepend}/overview-pyramid.svg" />
-        </phpdepend>
+    <!-- Run static analysis -->
+    <target name="check:psalm" depends="build:prepare">
+        <exec command="${check.psalm.command}" passthru="true" />
     </target>
 
-    <!-- Measure the size and analyzing the structure of a project -->
-    <target name="check:loc" description="Measures the size and analyzes the structure of a project">
-        <echo msg="Measuring the size and analyzing the structure of a project..." />
-        <phploc reportType="txt" reportName="phploc" reportDirectory="${dir.reports}">
-            <fileset refid="sourcecode" />
-        </phploc>
-
-        <!--
-        Previous / old version
-
-        Meritoo <github@meritoo.pl>
-        2017-02-22
-
-        <exec command="phploc \-\-log-csv=${dir.reports}/phploc.csv ${dir.src}" />
-        -->
+    <!-- Run analysis of code coverage -->
+    <target name="check:coveralls" depends="test:phpunit">
+        <exec command="${check.php_coveralls.command}" passthru="true" />
     </target>
 
-    <!-- Unit tests -->
-    <target name="test:unit" description="Executes unit tests">
-        <echo msg="Running unit tests..." />
-        <exec command="${tests.framework.path}" passthru="true"/>
+    <!-- PHPUnit tests -->
+    <target name="test:phpunit" depends="build:prepare">
+        <exec command="${tests.phpunit.command}" passthru="true" />
+    </target>
+
+    <!-- Run mutation testing -->
+    <target name="test:infection" depends="test:phpunit">
+        <exec command="${tests.mutation.command}" passthru="true" />
+    </target>
+
+    <!-- Project build clean -->
+    <target name="build:clean">
+        <if>
+            <available file="${dir.reports}" type="dir" property="dir_is_available" />
+            <then>
+                <delete dir="${dir.reports}" />
+            </then>
+        </if>
+    </target>
+
+    <!-- Project build prepare -->
+    <target name="build:prepare" depends="build:clean">
+        <mkdir dir="${dir.reports}" />
+        <mkdir dir="${dir.reports.coverage}" />
+        <mkdir dir="${dir.reports.code_sniffer}" />
     </target>
 
     <!-- Checkout and finalization -->

phpcs.xml.dist

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/squizlabs/php_codesniffer/phpcs.xsd">
+
+    <arg name="basepath" value="."/>
+    <arg name="cache" value=".phpcs-cache"/>
+    <arg name="colors"/>
+    <arg name="extensions" value="php"/>
+
+    <rule ref="PSR2"/>
+
+    <file>src/</file>
+    <file>tests/</file>
+
+</ruleset>

phpstan.neon.dist

@@ -0,0 +1,5 @@
+parameters:
+    level: 1
+    paths:
+        - src
+        - tests

phpunit.xml.dist

@@ -1,53 +1,37 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit
-        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/4.8/phpunit.xsd"
-        backupGlobals="true"
-        backupStaticAttributes="false"
-        bootstrap="./vendor/autoload.php"
-        cacheTokens="false"
-        colors="true"
-        convertErrorsToExceptions="true"
-        convertNoticesToExceptions="true"
-        convertWarningsToExceptions="true"
-        forceCoversAnnotation="false"
-        mapTestClassNameToCoveredClassName="false"
-        processIsolation="false"
-        stopOnError="false"
-        stopOnFailure="false"
-        stopOnIncomplete="false"
-        stopOnSkipped="false"
-        stopOnRisky="false"
-        testSuiteLoaderClass="PHPUnit_Runner_StandardTestSuiteLoader"
-        timeoutForSmallTests="1"
-        timeoutForMediumTests="10"
-        timeoutForLargeTests="60"
-        verbose="true"
+<!-- https://phpunit.readthedocs.io/en/8.2/configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         backupGlobals="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         executionOrder="random"
+         forceCoversAnnotation="true"
+         verbose="true"
 >
+    <coverage>
+        <include>
+            <directory>src</directory>
+        </include>
+        <report>
+            <clover outputFile="build/reports/coveralls/clover.xml" />
+            <html outputDirectory="build/reports/phpunit-coverage/html" />
+            <xml outputDirectory="build/reports/infection/coverage-xml" />
+        </report>
+    </coverage>
     <php>
-        <ini name="error_reporting" value="-1"/>
+        <ini name="error_reporting" value="-1" />
     </php>
-
     <testsuites>
         <testsuite name="Meritoo Package - Main Test Suite">
-            <directory>./tests/</directory>
+            <directory>tests</directory>
+        </testsuite>
+        <testsuite name="Collection">
+            <directory>tests/Collection</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./src/</directory>
-        </whitelist>
-    </filter>
-
-    <groups>
-        <exclude>
-            <group>performance</group>
-        </exclude>
-    </groups>
-
     <logging>
-        <log type="coverage-html" target="./build/logs/phpunit_coverage/html"/>
+        <junit outputFile="build/reports/infection/phpunit.junit.xml" />
     </logging>
 </phpunit>

psalm.xml

@@ -0,0 +1,53 @@
+<?xml version="1.0"?>
+<psalm
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        totallyTyped="false"
+        xmlns="https://getpsalm.org/schema/config"
+        xsi:schemaLocation="https://getpsalm.org/schema/config file:///project/vendor/vimeo/psalm/config.xsd"
+>
+    <projectFiles>
+        <directory name="src" />
+        <ignoreFiles>
+            <directory name="vendor" />
+        </ignoreFiles>
+    </projectFiles>
+
+    <issueHandlers>
+        <LessSpecificReturnType errorLevel="info" />
+
+        <!-- level 3 issues - slightly lazy code writing, but provably low false-negatives -->
+
+        <DeprecatedMethod errorLevel="info" />
+        <DeprecatedProperty errorLevel="info" />
+        <DeprecatedClass errorLevel="info" />
+        <DeprecatedConstant errorLevel="info" />
+        <DeprecatedInterface errorLevel="info" />
+        <DeprecatedTrait errorLevel="info" />
+
+        <InternalMethod errorLevel="info" />
+        <InternalProperty errorLevel="info" />
+        <InternalClass errorLevel="info" />
+
+        <MissingClosureReturnType errorLevel="info" />
+        <MissingReturnType errorLevel="info" />
+        <MissingPropertyType errorLevel="info" />
+        <InvalidDocblock errorLevel="info" />
+        <MisplacedRequiredParam errorLevel="info" />
+
+        <PropertyNotSetInConstructor errorLevel="info" />
+        <MissingConstructor errorLevel="info" />
+        <MissingClosureParamType errorLevel="info" />
+        <MissingParamType errorLevel="info" />
+
+        <RedundantCondition errorLevel="info" />
+
+        <DocblockTypeContradiction errorLevel="info" />
+        <RedundantConditionGivenDocblockType errorLevel="info" />
+
+        <UnresolvableInclude errorLevel="info" />
+
+        <RawObjectIteration errorLevel="info" />
+
+        <InvalidStringClass errorLevel="info" />
+    </issueHandlers>
+</psalm>

src/Collection/BaseCollection.php

@@ -0,0 +1,349 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Collection;
+
+use ArrayIterator;
+use Meritoo\Common\Contract\Collection\CollectionInterface;
+use Meritoo\Common\Utilities\Arrays;
+
+/**
+ * Collection of elements with the same type
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+abstract class BaseCollection implements CollectionInterface
+{
+    /**
+     * The elements of collection
+     *
+     * @var array
+     */
+    private array $elements;
+
+    /**
+     * Class constructor
+     *
+     * @param array $elements (optional) Elements of collection
+     */
+    public function __construct(array $elements = [])
+    {
+        $validated = $this->getElementsWithValidType($elements);
+        $this->elements = $this->prepareElements($validated);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function add($element, $index = null): void
+    {
+        if (!$this->isValidType($element)) {
+            return;
+        }
+
+        if (null === $index) {
+            $this->elements[] = $element;
+
+            return;
+        }
+
+        $this->elements[$index] = $element;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addMultiple($elements, bool $useIndexes = false): void
+    {
+        if (empty($elements)) {
+            return;
+        }
+
+        $prepared = $this->prepareElements($elements);
+
+        foreach ($prepared as $index => $element) {
+            if ($useIndexes) {
+                $this->add($element, $index);
+
+                continue;
+            }
+
+            $this->add($element);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function append($element): void
+    {
+        $this->elements[] = $element;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function clear(): void
+    {
+        $this->elements = [];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function count(): int
+    {
+        return count($this->elements);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getByIndex($index)
+    {
+        return $this->elements[$index] ?? null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFirst()
+    {
+        return Arrays::getFirstElement($this->elements);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getIterator(): ArrayIterator
+    {
+        return new ArrayIterator($this->elements);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getLast()
+    {
+        return Arrays::getLastElement($this->elements);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getNext($element)
+    {
+        return Arrays::getNextElement($this->elements, $element);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPrevious($element)
+    {
+        return Arrays::getPreviousElement($this->elements, $element);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function has($element): bool
+    {
+        $index = Arrays::getIndexOf($this->elements, $element);
+
+        return null !== $index && false !== $index;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isEmpty(): bool
+    {
+        return empty($this->elements);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isFirst($element): bool
+    {
+        return reset($this->elements) === $element;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isLast($element): bool
+    {
+        return end($this->elements) === $element;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function limit(int $max, int $offset = 0): self
+    {
+        $result = clone $this;
+
+        $negativeMax = $max <= 0;
+        $exceededMax = $max >= $this->count();
+
+        if ($negativeMax || $exceededMax) {
+            if ($negativeMax) {
+                $result->clear();
+            }
+
+            return $result;
+        }
+
+        $iteration = -1;
+
+        foreach ($result as $index => $element) {
+            $iteration++;
+
+            if ($iteration >= $offset && $iteration < $offset + $max) {
+                continue;
+            }
+
+            unset($result[$index]);
+        }
+
+        return $result;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetExists($offset): bool
+    {
+        return $this->exists($offset);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetGet($offset)
+    {
+        if ($this->exists($offset)) {
+            return $this->elements[$offset];
+        }
+
+        return null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetSet($offset, $value): void
+    {
+        $this->elements[$offset] = $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function offsetUnset($offset): void
+    {
+        if ($this->exists($offset)) {
+            unset($this->elements[$offset]);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function prepend($element): void
+    {
+        array_unshift($this->elements, $element);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function remove($element): void
+    {
+        if (0 === $this->count()) {
+            return;
+        }
+
+        foreach ($this->elements as $index => $existing) {
+            if ($element === $existing) {
+                unset($this->elements[$index]);
+
+                break;
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray(): array
+    {
+        return $this->elements;
+    }
+
+    /**
+     * Returns information if given element has valid type
+     *
+     * @param mixed $element Element of collection
+     * @return bool
+     */
+    abstract protected function isValidType($element): bool;
+
+    /**
+     * Prepares elements to initialize the collection.
+     * Feel free to override and prepare elements in your way.
+     *
+     * @param array $elements The elements of collection to prepare
+     * @return array
+     */
+    protected function prepareElements(array $elements): array
+    {
+        return $elements;
+    }
+
+    /**
+     * Returns information if element with given index/key exists
+     *
+     * @param int|string $index The index/key of element
+     * @return bool
+     */
+    private function exists($index): bool
+    {
+        return isset($this->elements[$index]) || array_key_exists($index, $this->elements);
+    }
+
+    /**
+     * Returns elements of collection with valid types
+     *
+     * @param array $elements The elements of collection to verify
+     * @return array
+     */
+    private function getElementsWithValidType(array $elements): array
+    {
+        if (empty($elements)) {
+            return [];
+        }
+
+        $result = [];
+
+        foreach ($elements as $index => $element) {
+            if (!$this->isValidType($element)) {
+                continue;
+            }
+
+            $result[$index] = $element;
+        }
+
+        return $result;
+    }
+}

src/Collection/Collection.php

@@ -1,284 +0,0 @@
-<?php
-
-/**
- * (c) Meritoo.pl, http://www.meritoo.pl
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Meritoo\Common\Collection;
-
-use ArrayAccess;
-use ArrayIterator;
-use Countable;
-use IteratorAggregate;
-use Meritoo\Common\Utilities\Arrays;
-
-/**
- * Collection of elements.
- * It's a set of some elements, e.g. objects.
- *
- * @author    Meritoo <github@meritoo.pl>
- * @copyright Meritoo <http://www.meritoo.pl>
- */
-class Collection implements Countable, ArrayAccess, IteratorAggregate
-{
-    /**
-     * The elements of collection
-     *
-     * @var array
-     */
-    private $elements;
-
-    /**
-     * Class constructor
-     *
-     * @param array $elements (optional) The elements of collection
-     */
-    public function __construct(array $elements = [])
-    {
-        $this->elements = $elements;
-    }
-
-    /**
-     * {@inheritdoc}
-     * Required by interface Countable
-     */
-    public function count()
-    {
-        return count($this->elements);
-    }
-
-    /**
-     * {@inheritdoc}
-     * Required by interface ArrayAccess
-     */
-    public function offsetExists($offset)
-    {
-        return $this->exists($offset);
-    }
-
-    /**
-     * {@inheritdoc}
-     * Required by interface ArrayAccess
-     */
-    public function offsetGet($offset)
-    {
-        if ($this->exists($offset)) {
-            return $this->elements[$offset];
-        }
-
-        return null;
-    }
-
-    /**
-     * {@inheritdoc}
-     * Required by interface ArrayAccess
-     */
-    public function offsetSet($offset, $value)
-    {
-        $this->elements[$offset] = $value;
-    }
-
-    /**
-     * {@inheritdoc}
-     * Required by interface ArrayAccess
-     */
-    public function offsetUnset($offset)
-    {
-        if ($this->exists($offset)) {
-            unset($this->elements[$offset]);
-        }
-    }
-
-    /**
-     * {@inheritdoc}
-     * Required by interface IteratorAggregate
-     */
-    public function getIterator()
-    {
-        return new ArrayIterator($this->elements);
-    }
-
-    /**
-     * Adds given element (at the end of collection)
-     *
-     * @param mixed $element The element to add
-     * @param mixed $index   (optional) Index / key of the element
-     * @return $this
-     */
-    public function add($element, $index = null)
-    {
-        if (null === $index || '' === $index) {
-            $this->elements[] = $element;
-        } else {
-            $this->elements[$index] = $element;
-        }
-
-        return $this;
-    }
-
-    /**
-     * Adds given elements (at the end of collection)
-     *
-     * @param array|Collection $elements   The elements to add
-     * @param bool|false       $useIndexes (optional) If is set to true, indexes of given elements will be used in
-     *                                     this collection. Otherwise - not.
-     * @return $this
-     */
-    public function addMultiple($elements, $useIndexes = false)
-    {
-        if (!empty($elements)) {
-            foreach ($elements as $index => $element) {
-                if (!$useIndexes) {
-                    $index = null;
-                }
-
-                $this->add($element, $index);
-            }
-        }
-
-        return $this;
-    }
-
-    /**
-     * Prepends given element (adds given element at the beginning of collection)
-     *
-     * @param mixed $element The element to prepend
-     * @return $this
-     */
-    public function prepend($element)
-    {
-        array_unshift($this->elements, $element);
-
-        return $this;
-    }
-
-    /**
-     * Removes given element
-     *
-     * @param mixed $element The element to remove
-     * @return $this
-     */
-    public function remove($element)
-    {
-        if ($this->count() > 0) {
-            foreach ($this->elements as $index => $existing) {
-                if ($element === $existing) {
-                    unset($this->elements[$index]);
-                    break;
-                }
-            }
-        }
-
-        return $this;
-    }
-
-    /**
-     * Returns information if collection is empty
-     *
-     * @return bool
-     */
-    public function isEmpty()
-    {
-        return empty($this->elements);
-    }
-
-    /**
-     * Returns information if given element is first in the collection
-     *
-     * @param mixed $element The element to verify
-     * @return bool
-     */
-    public function isFirst($element)
-    {
-        return reset($this->elements) === $element;
-    }
-
-    /**
-     * Returns information if given element is last in the collection
-     *
-     * @param mixed $element The element to verify
-     * @return bool
-     */
-    public function isLast($element)
-    {
-        return end($this->elements) === $element;
-    }
-
-    /**
-     * Returns information if the collection has given element, iow. if given element exists in the collection
-     *
-     * @param mixed $element The element to verify
-     * @return bool
-     */
-    public function has($element)
-    {
-        $index = Arrays::getIndexOf($this->elements, $element);
-
-        return null !== $index && false !== $index;
-    }
-
-    /**
-     * Returns previous element for given element
-     *
-     * @param mixed $element The element to verify
-     * @return mixed|null
-     */
-    public function getPrevious($element)
-    {
-        return Arrays::getPreviousElement($this->elements, $element);
-    }
-
-    /**
-     * Returns next element for given element
-     *
-     * @param mixed $element The element to verify
-     * @return mixed|null
-     */
-    public function getNext($element)
-    {
-        return Arrays::getNextElement($this->elements, $element);
-    }
-
-    /**
-     * Returns the first element in the collection
-     *
-     * @return mixed
-     */
-    public function getFirst()
-    {
-        return Arrays::getFirstElement($this->elements);
-    }
-
-    /**
-     * Returns the last element in the collection
-     *
-     * @return mixed
-     */
-    public function getLast()
-    {
-        return Arrays::getLastElement($this->elements);
-    }
-
-    /**
-     * Returns an array representation of the collection
-     *
-     * @return array
-     */
-    public function toArray()
-    {
-        return $this->elements;
-    }
-
-    /**
-     * Returns information if element with given index/key exists
-     *
-     * @param string|int $index The index/key of element
-     * @return bool
-     */
-    private function exists($index)
-    {
-        return isset($this->elements[$index]) || array_key_exists($index, $this->elements);
-    }
-}

src/Collection/DateTimeCollection.php

@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Collection;
+
+use DateTime;
+
+/**
+ * Collection of DateTime instances
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class DateTimeCollection extends BaseCollection
+{
+    protected function isValidType($element): bool
+    {
+        return $element instanceof DateTime;
+    }
+}

src/Collection/IntegerCollection.php

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Collection;
+
+/**
+ * Collection of integers
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class IntegerCollection extends BaseCollection
+{
+    protected function isValidType($element): bool
+    {
+        return is_int($element);
+    }
+}

src/Collection/StringCollection.php

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Collection;
+
+/**
+ * Collection of strings
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class StringCollection extends BaseCollection
+{
+    protected function isValidType($element): bool
+    {
+        return is_string($element);
+    }
+}

src/Collection/Templates.php

@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Collection;
+
+use Meritoo\Common\Exception\ValueObject\Template\TemplateNotFoundException;
+use Meritoo\Common\ValueObject\Template;
+
+/**
+ * Collection/storage of templates
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class Templates extends BaseCollection
+{
+    /**
+     * Finds and returns template with given index
+     *
+     * @param string $index Index that contains required template
+     * @return Template
+     * @throws TemplateNotFoundException
+     */
+    public function findTemplate(string $index): Template
+    {
+        $template = $this->getByIndex($index);
+
+        if ($template instanceof Template) {
+            return $template;
+        }
+
+        // Oops, template not found
+        throw TemplateNotFoundException::create($index);
+    }
+
+    /**
+     * Creates and returns the collection from given array
+     *
+     * @param array $templates Pairs of key-value where: key - template's index, value - template's content
+     * @return Templates
+     */
+    public static function fromArray(array $templates): Templates
+    {
+        // No templates. Nothing to do.
+        if (empty($templates)) {
+            return new static();
+        }
+
+        $result = new static();
+
+        foreach ($templates as $index => $template) {
+            $result->add(new Template($template), $index);
+        }
+
+        return $result;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function isValidType($element): bool
+    {
+        return $element instanceof Template;
+    }
+}

src/Contract/Collection/AddableCollectionInterface.php

@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+/**
+ * Contract for collection that may add elements
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface AddableCollectionInterface
+{
+    /**
+     * Adds given element (at the end of collection)
+     *
+     * @param mixed $element The element to add
+     * @param mixed $index   (optional) Index / key of the element
+     * @return void
+     */
+    public function add($element, $index = null): void;
+
+    /**
+     * Adds given elements (at the end of collection)
+     *
+     * @param array|CollectionInterface $elements   The elements to add
+     * @param bool                      $useIndexes (optional) If is set to true, indexes of given elements will be
+     *                                              used in this collection. Otherwise - not.
+     * @return void
+     */
+    public function addMultiple(array $elements, bool $useIndexes = false): void;
+
+    /**
+     * Appends given element (adds given element at the end of collection)
+     *
+     * @param mixed $element The element to add at the end
+     * @return void
+     */
+    public function append($element): void;
+
+    /**
+     * Prepends given element (adds given element at the beginning of collection)
+     *
+     * @param mixed $element The element to add at the beginning
+     * @return void
+     */
+    public function prepend($element): void;
+}

src/Contract/Collection/ClearableCollectionInterface.php

@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+/**
+ * Contract for collection that may be cleared (all its elements may be removed)
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface ClearableCollectionInterface
+{
+    /**
+     * Removes all elements of the collection
+     *
+     * @return void
+     */
+    public function clear(): void;
+}

src/Contract/Collection/CollectionInterface.php

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+use ArrayAccess;
+use IteratorAggregate;
+
+/**
+ * Contract for collection of elements with the same type
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface CollectionInterface extends ArrayAccess, IteratorAggregate, AddableCollectionInterface,
+    RemovableCollectionInterface, CountableCollectionInterface, ClearableCollectionInterface,
+    GettableCollectionInterface, VerifiableCollectionInterface, ReducibleCollectionInterface
+{
+    /**
+     * Returns representation of object as array
+     *
+     * @return array
+     */
+    public function toArray(): array;
+}

src/Contract/Collection/CountableCollectionInterface.php

@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+use Countable;
+
+/**
+ * Contract for collection that may count its elements
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface CountableCollectionInterface extends Countable
+{
+}

src/Contract/Collection/GettableCollectionInterface.php

@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+/**
+ * Contract for collection that returns first, last element etc.
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface GettableCollectionInterface
+{
+    /**
+     * Returns element with given index
+     *
+     * @param mixed $index Index / key of element to return
+     * @return mixed
+     */
+    public function getByIndex($index);
+
+    /**
+     * Returns first element
+     *
+     * @return mixed
+     */
+    public function getFirst();
+
+    /**
+     * Returns last element
+     *
+     * @return mixed
+     */
+    public function getLast();
+
+    /**
+     * Returns element next after given element
+     *
+     * @param mixed $element The element whose next element should be returned
+     * @return mixed
+     */
+    public function getNext($element);
+
+    /**
+     * Returns element preceding given element
+     *
+     * @param mixed $element The element whose previous element should be returned
+     * @return mixed
+     */
+    public function getPrevious($element);
+}

src/Contract/Collection/ReducibleCollectionInterface.php

@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+/**
+ * Contract for collection that may reduce its elements
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface ReducibleCollectionInterface
+{
+    /**
+     * Returns new instance of this collection with limited elements
+     *
+     * @param int $max    Maximum elements to return
+     * @param int $offset (optional) Position of element from which limitation should start
+     * @return $this
+     */
+    public function limit(int $max, int $offset = 0): self;
+}

src/Contract/Collection/RemovableCollectionInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+/**
+ * Contract for collection that may remove elements
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface RemovableCollectionInterface
+{
+    /**
+     * Removes given element
+     *
+     * @param mixed $element The element to remove
+     * @return void
+     */
+    public function remove($element): void;
+}

src/Contract/Collection/VerifiableCollectionInterface.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Collection;
+
+/**
+ * Contract for collection that may verify its elements
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface VerifiableCollectionInterface
+{
+    /**
+     * Returns information if given element exists in collection
+     *
+     * @param mixed $element The element to verify
+     * @return bool
+     */
+    public function has($element): bool;
+
+    /**
+     * Returns information if collection is empty (has not any element)
+     *
+     * @return bool
+     */
+    public function isEmpty(): bool;
+
+    /**
+     * Returns information if given element is the first element in collection
+     *
+     * @param mixed $element The element to verify
+     * @return bool
+     */
+    public function isFirst($element): bool;
+
+    /**
+     * Returns information if given element is the last element in collection
+     *
+     * @param mixed $element The element to verify
+     * @return bool
+     */
+    public function isLast($element): bool;
+}

src/Contract/Renderable/RenderableInterface.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Contract\Renderable;
+
+use Meritoo\Common\Collection\Templates;
+
+/**
+ * Interface/Contract of something that may be rendered
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+interface RenderableInterface
+{
+    /**
+     * Renders this object using given templates
+     *
+     * @param Templates $templates Collection/storage of templates that will be required while rendering this and
+     *                             related objects, e.g. children of this object
+     * @return string
+     */
+    public function render(Templates $templates): string;
+}

src/Exception/Base/UnknownTypeException.php

@@ -23,19 +23,19 @@ abstract class UnknownTypeException extends Exception
     /**
      * Creates exception
      *
-     * @param string|int $unknownType  The unknown type of something (value of constant)
-     * @param BaseType   $typeInstance An instance of class that contains type of the something
-     * @param string     $typeName     Name of the something
+     * @param mixed    $unknownType  The unknown type of something (value of constant)
+     * @param BaseType $typeInstance An instance of class that contains type of the something
+     * @param string   $typeName     Name of the something
      * @return UnknownTypeException
      */
-    public static function create($unknownType, BaseType $typeInstance, $typeName)
+    public static function create($unknownType, BaseType $typeInstance, string $typeName): UnknownTypeException
     {
         $template = 'The \'%s\' type of %s is unknown. Probably doesn\'t exist or there is a typo. You should use one'
-            . ' of these types: %s.';
+            .' of these types: %s.';
 
         $allTypes = $typeInstance->getAll();
-        $types = Arrays::values2string($allTypes, '', ', ');
-        $message = sprintf(sprintf($template, $unknownType, $typeName, $types));
+        $types = Arrays::values2string($allTypes, '', ', ') ?? '[types not found]';
+        $message = sprintf($template, $unknownType, $typeName, $types);
 
         return new static($message);
     }

src/Exception/Bundle/IncorrectBundleNameException.php

@@ -27,7 +27,7 @@ class IncorrectBundleNameException extends Exception
     public static function create($bundleName)
     {
         $template = 'Name of bundle \'%s\' is incorrect. It should start with big letter and end with "Bundle". Is'
-            . ' there everything ok?';
+            .' there everything ok?';
 
         $message = sprintf($template, $bundleName);
 

src/Exception/File/EmptyFileException.php

@@ -8,13 +8,15 @@
 
 namespace Meritoo\Common\Exception\File;
 
+use Exception;
+
 /**
  * An exception used while file with given path is empty (has no content)
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class EmptyFileException extends \Exception
+class EmptyFileException extends Exception
 {
     /**
      * Creates exception

src/Exception/File/EmptyFilePathException.php

@@ -8,18 +8,22 @@
 
 namespace Meritoo\Common\Exception\File;
 
+use Exception;
+
 /**
  * An exception used while path of given file is empty
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class EmptyFilePathException extends \Exception
+class EmptyFilePathException extends Exception
 {
     /**
      * Creates exception
+     *
+     * @return EmptyFilePathException
      */
-    public static function create()
+    public static function create(): EmptyFilePathException
     {
         return new static('Path of the file is empty. Did you provide path of proper file?');
     }

src/Exception/File/NotExistingFileException.php

@@ -8,13 +8,15 @@
 
 namespace Meritoo\Common\Exception\File;
 
+use Exception;
+
 /**
  * An exception used while file with given path does not exist
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class NotExistingFileException extends \Exception
+class NotExistingFileException extends Exception
 {
     /**
      * Creates exception

src/Exception/Method/DisabledMethodException.php

@@ -28,13 +28,13 @@ class DisabledMethodException extends Exception
     public static function create($disabledMethod, $alternativeMethod = '')
     {
         $template = 'Method %s() cannot be called, because is disabled.';
+        $message = sprintf($template, $disabledMethod);
 
         if (!empty($alternativeMethod)) {
-            $template .= ' Use %s() instead.';
+            $template = '%s Use %s() instead.';
+            $message = sprintf($template, $message, $alternativeMethod);
         }
 
-        $message = sprintf($template, $disabledMethod, $alternativeMethod);
-
         return new static($message);
     }
 }

src/Exception/Reflection/CannotResolveClassNameException.php

@@ -21,13 +21,12 @@ class CannotResolveClassNameException extends Exception
     /**
      * Creates exception
      *
-     * @param array|object|string $source   Source of the class's / trait's name. It can be an array of objects,
-     *                                      namespaces, object or namespace.
-     * @param bool                $forClass (optional) If is set to true, message of this exception for class is
-     *                                      prepared. Otherwise - for trait.
+     * @param string $source   Source of name of the class or trait
+     * @param bool   $forClass (optional) If is set to true, message of this exception for class is prepared. Otherwise
+     *                         - for trait.
      * @return CannotResolveClassNameException
      */
-    public static function create($source, $forClass = true)
+    public static function create(string $source, bool $forClass = true): CannotResolveClassNameException
     {
         $forWho = 'trait';
         $value = '';
@@ -37,7 +36,7 @@ class CannotResolveClassNameException extends Exception
         }
 
         if (is_scalar($source)) {
-            $value = sprintf(' %s', (string)$source);
+            $value = sprintf(' %s', $source);
         }
 
         $template = 'Name of %s from given \'%s\'%s cannot be resolved. Is there everything ok?';

src/Exception/Reflection/ClassWithoutConstructorException.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Exception\Reflection;
+
+use Exception;
+
+/**
+ * An exception used while given class hasn't constructor
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class ClassWithoutConstructorException extends Exception
+{
+    /**
+     * Creates exception
+     *
+     * @param string $className Fully-qualified name of class that hasn't constructor
+     * @return ClassWithoutConstructorException
+     */
+    public static function create(string $className): ClassWithoutConstructorException
+    {
+        $template = 'Oops, class \'%s\' hasn\'t constructor. Did you use proper class?';
+        $message = sprintf($template, $className);
+
+        return new static($message);
+    }
+}

src/Exception/Reflection/MissingChildClassesException.php

@@ -26,12 +26,12 @@ class MissingChildClassesException extends Exception
      *                                         strings, object or string.
      * @return MissingChildClassesException
      */
-    public static function create($parentClass)
+    public static function create($parentClass): MissingChildClassesException
     {
         $template = 'The \'%s\' class requires one child class at least who will extend her (maybe is an abstract'
-            . ' class), but the child classes are missing. Did you forget to extend this class?';
+            .' class), but the child classes are missing. Did you forget to extend this class?';
 
-        $parentClassName = Reflection::getClassName($parentClass);
+        $parentClassName = Reflection::getClassName($parentClass) ?? '[unknown class]';
         $message = sprintf($template, $parentClassName);
 
         return new static($message);

src/Exception/Reflection/NotExistingPropertyException.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Exception\Reflection;
+
+use Exception;
+
+/**
+ * An exception used while property does not exist in instance of class
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class NotExistingPropertyException extends Exception
+{
+    /**
+     * Creates exception
+     *
+     * @param mixed       $object   Object that should contains given property
+     * @param null|string $property Name of the property
+     * @return NotExistingPropertyException
+     */
+    public static function create($object, ?string $property): NotExistingPropertyException
+    {
+        $template = 'Property \'%s\' does not exist in instance of class \'%s\'. Did you use proper name of property?';
+        $message = sprintf($template, $property, get_class($object));
+
+        return new static($message);
+    }
+}

src/Exception/Reflection/TooManyChildClassesException.php

@@ -27,12 +27,12 @@ class TooManyChildClassesException extends Exception
      * @param array               $childClasses Child classes
      * @return TooManyChildClassesException
      */
-    public static function create($parentClass, array $childClasses)
+    public static function create($parentClass, array $childClasses): TooManyChildClassesException
     {
         $template = "The '%s' class requires one child class at most who will extend her, but more than one child"
-            . " class was found:\n- %s\n\nWhy did you create more than one classes that extend '%s' class?";
+            ." class was found:\n- %s\n\nWhy did you create more than one classes that extend '%s' class?";
 
-        $parentClassName = Reflection::getClassName($parentClass);
+        $parentClassName = Reflection::getClassName($parentClass) ?? '[unknown class]';
         $message = sprintf($template, $parentClassName, implode("\n- ", $childClasses), $parentClassName);
 
         return new static($message);

src/Exception/Regex/IncorrectColorHexLengthException.php

@@ -8,13 +8,15 @@
 
 namespace Meritoo\Common\Exception\Regex;
 
+use Exception;
+
 /**
  * An exception used while length of given hexadecimal value of color is incorrect
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class IncorrectColorHexLengthException extends \Exception
+class IncorrectColorHexLengthException extends Exception
 {
     /**
      * Creates exception
@@ -25,7 +27,7 @@ class IncorrectColorHexLengthException extends \Exception
     public static function create($color)
     {
         $template = 'Length of hexadecimal value of color \'%s\' is incorrect. It\'s %d, but it should be 3 or 6.'
-            . ' Is there everything ok?';
+            .' Is there everything ok?';
 
         $message = sprintf($template, $color, strlen($color));
 

src/Exception/Regex/InvalidColorHexValueException.php

@@ -8,13 +8,15 @@
 
 namespace Meritoo\Common\Exception\Regex;
 
+use Exception;
+
 /**
  * An exception used while given hexadecimal value of color is invalid
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class InvalidColorHexValueException extends \Exception
+class InvalidColorHexValueException extends Exception
 {
     /**
      * Creates exception

src/Exception/Regex/InvalidHtmlAttributesException.php

@@ -8,13 +8,15 @@
 
 namespace Meritoo\Common\Exception\Regex;
 
+use Exception;
+
 /**
  * An exception used while html attributes are invalid
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class InvalidHtmlAttributesException extends \Exception
+class InvalidHtmlAttributesException extends Exception
 {
     /**
      * Creates exception

src/Exception/Regex/InvalidUrlException.php

@@ -8,13 +8,15 @@
 
 namespace Meritoo\Common\Exception\Regex;
 
+use Exception;
+
 /**
  * An exception used while url is invalid
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
-class InvalidUrlException extends \Exception
+class InvalidUrlException extends Exception
 {
     /**
      * Creates exception

src/Exception/Type/UnknownDatePartTypeException.php

@@ -26,11 +26,8 @@ class UnknownDatePartTypeException extends UnknownTypeException
      * @param string $value           Incorrect value
      * @return UnknownDatePartTypeException
      */
-    public static function createException($unknownDatePart, $value)
+    public static function createException(string $unknownDatePart, string $value): UnknownDatePartTypeException
     {
-        /* @var UnknownDatePartTypeException $exception */
-        $exception = parent::create($unknownDatePart, new DatePartType(), sprintf('date part (with value %s)', $value));
-
-        return $exception;
+        return parent::create($unknownDatePart, new DatePartType(), sprintf('date part (with value %s)', $value));
     }
 }

src/Exception/Type/UnknownOopVisibilityTypeException.php

@@ -25,11 +25,8 @@ class UnknownOopVisibilityTypeException extends UnknownTypeException
      * @param string $unknownType Unknown visibility of a property, a method or (as of PHP 7.1.0) a constant
      * @return UnknownOopVisibilityTypeException
      */
-    public static function createException($unknownType)
+    public static function createException(string $unknownType): UnknownOopVisibilityTypeException
     {
-        /* @var UnknownOopVisibilityTypeException $exception */
-        $exception = parent::create($unknownType, new OopVisibilityType(), 'OOP-related visibility');
-
-        return $exception;
+        return parent::create($unknownType, new OopVisibilityType(), 'OOP-related visibility');
     }
 }

src/Exception/ValueObject/InvalidSizeDimensionsException.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Exception\ValueObject;
+
+use Exception;
+
+/**
+ * An exception used while dimensions of size, passed to the instance of Size class, are invalid
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class InvalidSizeDimensionsException extends Exception
+{
+    /**
+     * Creates exception
+     *
+     * @param int $width  The width
+     * @param int $height The height
+     * @return InvalidSizeDimensionsException
+     */
+    public static function create($width, $height)
+    {
+        $template = 'Dimensions of size should be positive, but they are not: %d, %d. Is there everything ok?';
+        $message = sprintf($template, $width, $height);
+
+        return new static($message);
+    }
+}

src/Exception/ValueObject/Template/InvalidContentException.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Exception\ValueObject\Template;
+
+use Exception;
+
+/**
+ * An exception used while content of template is invalid
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class InvalidContentException extends Exception
+{
+    /**
+     * Creates an exception
+     *
+     * @param string $content Invalid content of template
+     * @return InvalidContentException
+     */
+    public static function create(string $content): InvalidContentException
+    {
+        $template = 'Content of template \'%s\' is invalid. Did you use string with 1 placeholder at least?';
+        $message = sprintf($template, $content);
+
+        return new static($message);
+    }
+}

src/Exception/ValueObject/Template/MissingPlaceholdersInValuesException.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Exception\ValueObject\Template;
+
+use Exception;
+
+/**
+ * An exception used while there are missing values required to fill all placeholders in template
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class MissingPlaceholdersInValuesException extends Exception
+{
+    /**
+     * Creates an exception
+     *
+     * @param string $content             Content of template
+     * @param array  $missingPlaceholders Missing placeholders in provided values, iow. placeholders without values
+     * @return MissingPlaceholdersInValuesException
+     */
+    public static function create(string $content, array $missingPlaceholders): MissingPlaceholdersInValuesException
+    {
+        $template = 'Cannot fill template \'%s\', because of missing values for placeholder(s): %s. Did you provide all'
+            .' required values?';
+        $message = sprintf($template, $content, implode(', ', $missingPlaceholders));
+
+        return new static($message);
+    }
+}

src/Exception/ValueObject/Template/TemplateNotFoundException.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Exception\ValueObject\Template;
+
+use Exception;
+
+/**
+ * An exception used while template with given index was not found
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class TemplateNotFoundException extends Exception
+{
+    /**
+     * Creates the exception
+     *
+     * @param string $index Index that should contain template, but it was not found
+     * @return TemplateNotFoundException
+     */
+    public static function create(string $index): TemplateNotFoundException
+    {
+        $template = 'Template with \'%s\' index was not found. Did you provide all required templates?';
+        $message = sprintf($template, $index);
+
+        return new static($message);
+    }
+}

src/Traits/CssSelector/FormCssSelector.php

@@ -0,0 +1,110 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Traits\CssSelector;
+
+/**
+ * Useful methods related to CSS selectors of form
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+trait FormCssSelector
+{
+    /**
+     * Returns selector of field-set using index/position of the field-set
+     *
+     * @param string $formName      Name of form (value of the "name" attribute)
+     * @param int    $fieldSetIndex Index/Position of the field-set
+     * @return string
+     */
+    public static function getFieldSetByIndexSelector($formName, $fieldSetIndex)
+    {
+        $formSelector = static::getFormByNameSelector($formName);
+
+        if (empty($formSelector) || 0 > $fieldSetIndex) {
+            return '';
+        }
+
+        return sprintf('%s fieldset:nth-of-type(%d)', $formSelector, $fieldSetIndex);
+    }
+
+    /**
+     * Returns selector of form based on its name
+     *
+     * @param string $formName Name of form (value of the "name" attribute)
+     * @return string
+     */
+    public static function getFormByNameSelector($formName)
+    {
+        $formName = trim($formName);
+
+        if (empty($formName)) {
+            return '';
+        }
+
+        return sprintf('form[name="%s"]', $formName);
+    }
+
+    /**
+     * Returns selector of the input field based on its ID
+     *
+     * @param string $formName Name of form (value of the "name" attribute)
+     * @param string $fieldId  ID of field (value of the "id" attribute)
+     * @return string
+     */
+    public static function getInputByIdSelector($formName, $fieldId)
+    {
+        $formSelector = static::getFormByNameSelector($formName);
+        $fieldId = trim($fieldId);
+
+        if (empty($formSelector) || empty($fieldId)) {
+            return '';
+        }
+
+        return sprintf('%s input#%s', $formSelector, $fieldId);
+    }
+
+    /**
+     * Returns selector of the input field based on its name
+     *
+     * @param string $formName  Name of form (value of the "name" attribute)
+     * @param string $fieldName Name of field (value of the "name" attribute)
+     * @return string
+     */
+    public static function getInputByNameSelector($formName, $fieldName)
+    {
+        $formSelector = static::getFormByNameSelector($formName);
+        $fieldName = trim($fieldName);
+
+        if (empty($formSelector) || empty($fieldName)) {
+            return '';
+        }
+
+        return sprintf('%s input[name="%s"]', $formSelector, $fieldName);
+    }
+
+    /**
+     * Returns selector of label
+     *
+     * @param string $formName Name of form (value of the "name" attribute)
+     * @param string $fieldId  ID of field (value of the "id" attribute)
+     * @return string
+     */
+    public static function getLabelSelector($formName, $fieldId)
+    {
+        $formSelector = static::getFormByNameSelector($formName);
+        $fieldId = trim($fieldId);
+
+        if (empty($formSelector) || empty($fieldId)) {
+            return '';
+        }
+
+        return sprintf('%s label[for="%s"]', $formSelector, $fieldId);
+    }
+}

src/Traits/Test/Base/BaseTestCaseTrait.php

@@ -6,21 +6,23 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Meritoo\Common\Traits\Test\Base;
 
 use DateTime;
 use Generator;
+use Meritoo\Common\Exception\Reflection\ClassWithoutConstructorException;
 use Meritoo\Common\Exception\Type\UnknownOopVisibilityTypeException;
 use Meritoo\Common\Type\OopVisibilityType;
 use Meritoo\Common\Utilities\Miscellaneous;
 use ReflectionClass;
-use ReflectionException;
 use ReflectionMethod;
+use RuntimeException;
 use stdClass;
 
 /**
- * BaseTestCaseTrait
- * Created on 2017-11-02
+ * Trait for the base test case
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
@@ -34,30 +36,15 @@ trait BaseTestCaseTrait
      */
     private static $testsDataDirPath = 'data/tests';
 
-    /**
-     * Provides an empty value
-     *
-     * @return Generator
-     */
-    public function provideEmptyValue()
-    {
-        yield[''];
-        yield['   '];
-        yield[null];
-        yield[0];
-        yield[false];
-        yield[[]];
-    }
-
     /**
      * Provides boolean value
      *
      * @return Generator
      */
-    public function provideBooleanValue()
+    public function provideBooleanValue(): ?Generator
     {
-        yield[false];
-        yield[true];
+        yield [false];
+        yield [true];
     }
 
     /**
@@ -65,12 +52,12 @@ trait BaseTestCaseTrait
      *
      * @return Generator
      */
-    public function provideDateTimeInstance()
+    public function provideDateTimeInstance(): ?Generator
     {
-        yield[new DateTime()];
-        yield[new DateTime('yesterday')];
-        yield[new DateTime('now')];
-        yield[new DateTime('tomorrow')];
+        yield [new DateTime()];
+        yield [new DateTime('yesterday')];
+        yield [new DateTime('now')];
+        yield [new DateTime('tomorrow')];
     }
 
     /**
@@ -78,31 +65,48 @@ trait BaseTestCaseTrait
      *
      * @return Generator
      */
-    public function provideDateTimeRelativeFormat()
+    public function provideDateTimeRelativeFormat(): ?Generator
     {
-        yield['now'];
-        yield['yesterday'];
-        yield['tomorrow'];
-        yield['back of 10'];
-        yield['front of 10'];
-        yield['last day of February'];
-        yield['first day of next month'];
-        yield['last day of previous month'];
-        yield['last day of next month'];
-        yield['Y-m-d'];
-        yield['Y-m-d 10:00'];
+        yield ['now'];
+        yield ['yesterday'];
+        yield ['tomorrow'];
+        yield ['back of 10'];
+        yield ['front of 10'];
+        yield ['last day of February'];
+        yield ['first day of next month'];
+        yield ['last day of previous month'];
+        yield ['last day of next month'];
+        yield ['Y-m-d'];
+        yield ['Y-m-d 10:00'];
     }
 
     /**
-     * Provides path of not existing file, e.g. "lorem/ipsum.jpg"
+     * Provides an empty scalar value
      *
      * @return Generator
      */
-    public function provideNotExistingFilePath()
+    public function provideEmptyScalarValue(): ?Generator
     {
-        yield['lets-test.doc'];
-        yield['lorem/ipsum.jpg'];
-        yield['surprise/me/one/more/time.txt'];
+        yield [''];
+        yield ['   '];
+        yield [null];
+        yield [0];
+        yield [false];
+    }
+
+    /**
+     * Provides an empty value
+     *
+     * @return Generator
+     */
+    public function provideEmptyValue(): ?Generator
+    {
+        yield [''];
+        yield ['   '];
+        yield [null];
+        yield [0];
+        yield [false];
+        yield [[]];
     }
 
     /**
@@ -110,19 +114,114 @@ trait BaseTestCaseTrait
      *
      * @return Generator
      */
-    public function provideNonScalarValue()
+    public function provideNonScalarValue(): ?Generator
     {
-        yield[
-            [],
-        ];
+        yield [[]];
+        yield [null];
+        yield [new stdClass()];
+    }
 
-        yield[
-            null,
-        ];
+    /**
+     * Provides path of not existing file, e.g. "lorem/ipsum.jpg"
+     *
+     * @return Generator
+     */
+    public function provideNotExistingFilePath(): ?Generator
+    {
+        yield ['lets-test.doc'];
+        yield ['lorem/ipsum.jpg'];
+        yield ['surprise/me/one/more/time.txt'];
+    }
 
-        yield[
-            new stdClass(),
-        ];
+    /**
+     * Verifies visibility and arguments of class constructor
+     *
+     * @param string $className              Fully-qualified name of class that contains constructor to verify
+     * @param string $visibilityType         Expected visibility of verified method. One of OopVisibilityType class
+     *                                       constants.
+     * @param int    $argumentsCount         (optional) Expected count/amount of arguments of the verified method
+     * @param int    $requiredArgumentsCount (optional) Expected count/amount of required arguments of the verified
+     *                                       method
+     * @throws ClassWithoutConstructorException
+     */
+    protected static function assertConstructorVisibilityAndArguments(
+        string $className,
+        string $visibilityType,
+        int $argumentsCount = 0,
+        int $requiredArgumentsCount = 0
+    ): void {
+        $reflection = new ReflectionClass($className);
+        $method = $reflection->getConstructor();
+
+        if (null === $method) {
+            throw ClassWithoutConstructorException::create($className);
+        }
+
+        static::assertMethodVisibility($method, $visibilityType);
+        static::assertMethodArgumentsCount($method, $argumentsCount, $requiredArgumentsCount);
+    }
+
+    /**
+     * Asserts that class with given namespace has no constructor
+     *
+     * @param string $className Fully-qualified name of class that contains constructor to verify
+     */
+    protected static function assertHasNoConstructor(string $className): void
+    {
+        $reflection = new ReflectionClass($className);
+        $constructor = $reflection->getConstructor();
+
+        static::assertNull($constructor);
+    }
+
+    /**
+     * Verifies count of method's arguments
+     *
+     * @param ReflectionMethod $method         Name of method or just the method to verify
+     * @param int              $argumentsCount (optional) Expected count/amount of arguments of the verified method
+     * @param int              $requiredCount  (optional) Expected count/amount of required arguments of the verified
+     *                                         method
+     * @throws RuntimeException
+     */
+    protected static function assertMethodArgumentsCount(
+        ReflectionMethod $method,
+        int $argumentsCount = 0,
+        int $requiredCount = 0
+    ): void {
+        static::assertSame($argumentsCount, $method->getNumberOfParameters());
+        static::assertSame($requiredCount, $method->getNumberOfRequiredParameters());
+    }
+
+    /**
+     * Verifies visibility of method
+     *
+     * @param ReflectionMethod $method                 Name of method or just the method to verify
+     * @param string           $visibilityType         Expected visibility of verified method. One of OopVisibilityType
+     *                                                 class constants.
+     * @throws UnknownOopVisibilityTypeException
+     * @throws RuntimeException
+     */
+    protected static function assertMethodVisibility(ReflectionMethod $method, string $visibilityType): void
+    {
+        // Type of visibility is not correct?
+        if (!OopVisibilityType::isCorrectType($visibilityType)) {
+            throw UnknownOopVisibilityTypeException::createException($visibilityType);
+        }
+
+        switch ($visibilityType) {
+            case OopVisibilityType::IS_PUBLIC:
+                static::assertTrue($method->isPublic());
+
+                break;
+            case OopVisibilityType::IS_PROTECTED:
+                static::assertTrue($method->isProtected());
+
+                break;
+            case OopVisibilityType::IS_PRIVATE:
+                static::assertTrue($method->isPrivate());
+
+                break;
+        }
     }
 
     /**
@@ -133,7 +232,7 @@ trait BaseTestCaseTrait
      * @param string $directoryPath (optional) Path of directory containing the file
      * @return string
      */
-    public function getFilePathForTesting($fileName, $directoryPath = '')
+    protected function getFilePathForTesting(string $fileName, string $directoryPath = ''): string
     {
         $rootPath = Miscellaneous::getProjectRootPath();
 
@@ -147,116 +246,12 @@ trait BaseTestCaseTrait
         return Miscellaneous::concatenatePaths($paths);
     }
 
-    /**
-     * Verifies visibility and arguments of method
-     *
-     * @param string                  $classNamespace         Namespace of class that contains method to verify
-     * @param string|ReflectionMethod $method                 Name of method or just the method to verify
-     * @param string                  $visibilityType         Expected visibility of verified method. One of
-     *                                                        OopVisibilityType class constants.
-     * @param int                     $argumentsCount         (optional) Expected count/amount of arguments of the
-     *                                                        verified method
-     * @param int                     $requiredArgumentsCount (optional) Expected count/amount of required arguments
-     *                                                        of the verified method
-     * @throws UnknownOopVisibilityTypeException
-     * @throws ReflectionException
-     *
-     * Attention. 2nd argument, the $method, may be:
-     * - string - name of the method
-     * - instance of ReflectionMethod - just the method (provided by ReflectionClass::getMethod() method)
-     */
-    protected static function assertMethodVisibilityAndArguments(
-        $classNamespace,
-        $method,
-        $visibilityType,
-        $argumentsCount = 0,
-        $requiredArgumentsCount = 0
-    ) {
-        /*
-         * Type of visibility is correct?
-         */
-        if (!(new OopVisibilityType())->isCorrectType($visibilityType)) {
-            throw new UnknownOopVisibilityTypeException($visibilityType);
-        }
-
-        $reflection = new ReflectionClass($classNamespace);
-
-        /*
-         * Name of method provided only?
-         * Let's find instance of the method (based on reflection)
-         */
-        if (!$method instanceof ReflectionMethod) {
-            $method = $reflection->getMethod($method);
-        }
-
-        switch ($visibilityType) {
-            case OopVisibilityType::IS_PUBLIC:
-                static::assertTrue($method->isPublic());
-                break;
-
-            case OopVisibilityType::IS_PROTECTED:
-                static::assertTrue($method->isProtected());
-                break;
-
-            case OopVisibilityType::IS_PRIVATE:
-                static::assertTrue($method->isPrivate());
-                break;
-        }
-
-        static::assertEquals($argumentsCount, $method->getNumberOfParameters());
-        static::assertEquals($requiredArgumentsCount, $method->getNumberOfRequiredParameters());
-    }
-
-    /**
-     * Verifies visibility and arguments of class constructor
-     *
-     * @param string $classNamespace         Namespace of class that contains constructor to verify
-     * @param string $visibilityType         Expected visibility of verified method. One of OopVisibilityType class
-     *                                       constants.
-     * @param int    $argumentsCount         (optional) Expected count/amount of arguments of the verified method
-     * @param int    $requiredArgumentsCount (optional) Expected count/amount of required arguments of the verified
-     *                                       method
-     * @throws ReflectionException
-     * @throws UnknownOopVisibilityTypeException
-     */
-    protected static function assertConstructorVisibilityAndArguments(
-        $classNamespace,
-        $visibilityType,
-        $argumentsCount = 0,
-        $requiredArgumentsCount = 0
-    ) {
-        /*
-         * Let's grab the constructor
-         */
-        $reflection = new ReflectionClass($classNamespace);
-        $method = $reflection->getConstructor();
-
-        static::assertMethodVisibilityAndArguments($classNamespace, $method, $visibilityType, $argumentsCount, $requiredArgumentsCount);
-    }
-
-    /**
-     * Asserts that class with given namespace has no constructor
-     *
-     * @param string $classNamespace Namespace of class that contains constructor to verify
-     * @throws ReflectionException
-     */
-    protected static function assertHasNoConstructor($classNamespace)
-    {
-        /*
-         * Let's grab the constructor
-         */
-        $reflection = new ReflectionClass($classNamespace);
-        $constructor = $reflection->getConstructor();
-
-        static::assertNull($constructor);
-    }
-
     /**
      * Sets path of directory with data used by test cases
      *
      * @param string $testsDataDirPath Path of directory with data used by test cases
      */
-    protected static function setTestsDataDirPath($testsDataDirPath)
+    protected static function setTestsDataDirPath(string $testsDataDirPath): void
     {
         static::$testsDataDirPath = $testsDataDirPath;
     }

src/Traits/Test/Base/BaseTypeTestCaseTrait.php

@@ -6,6 +6,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Meritoo\Common\Traits\Test\Base;
 
 use Generator;
@@ -19,10 +21,17 @@ use Meritoo\Common\Type\Base\BaseType;
  */
 trait BaseTypeTestCaseTrait
 {
+    /**
+     * Provides type to verify and information if it's correct
+     *
+     * @return Generator
+     */
+    abstract public function provideTypeToVerify(): Generator;
+
     /**
      * Verifies availability of all types
      */
-    public function testAvailabilityOfAllTypes()
+    public function testAvailabilityOfAllTypes(): void
     {
         $available = $this->getTestedTypeInstance()->getAll();
         $all = $this->getAllExpectedTypes();
@@ -33,34 +42,27 @@ trait BaseTypeTestCaseTrait
     /**
      * Verifies whether given type is correct or not
      *
-     * @param string $type     Type to verify
-     * @param bool   $expected Information if given type is correct or not
+     * @param bool $isCorrect Information if processed type is correct
+     * @param bool $expected  Expected information if processed type is correct
      *
      * @dataProvider provideTypeToVerify
      */
-    public function testIfGivenTypeIsCorrect($type, $expected)
+    public function testIfGivenTypeIsCorrect(bool $isCorrect, bool $expected): void
     {
-        static::assertEquals($expected, $this->getTestedTypeInstance()->isCorrectType($type));
+        static::assertEquals($expected, $isCorrect);
     }
 
-    /**
-     * Provides type to verify and information if it's correct
-     *
-     * @return Generator
-     */
-    abstract public function provideTypeToVerify();
-
-    /**
-     * Returns instance of the tested type
-     *
-     * @return BaseType
-     */
-    abstract protected function getTestedTypeInstance();
-
     /**
      * Returns all expected types of the tested type
      *
      * @return array
      */
-    abstract protected function getAllExpectedTypes();
+    abstract protected function getAllExpectedTypes(): array;
+
+    /**
+     * Returns instance of the tested type
+     *
+     * @return BaseType
+     */
+    abstract protected function getTestedTypeInstance(): BaseType;
 }

src/Traits/ValueObject/HumanTrait.php

@@ -0,0 +1,144 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Meritoo\Common\Traits\ValueObject;
+
+use DateTime;
+
+/**
+ * Methods and properties related to human
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+trait HumanTrait
+{
+    /**
+     * First name
+     *
+     * @var string
+     */
+    protected $firstName;
+
+    /**
+     * Last name
+     *
+     * @var string
+     */
+    protected $lastName;
+
+    /**
+     * Email address
+     *
+     * @var null|string
+     */
+    protected $email;
+
+    /**
+     * Birth date
+     *
+     * @var null|DateTime
+     */
+    protected $birthDate;
+
+    /**
+     * Class constructor
+     *
+     * @param string        $firstName First name
+     * @param string        $lastName  Last name
+     * @param null|string   $email     (optional) Email address. Default: null.
+     * @param null|DateTime $birthDate (optional) Birth date. Default: null.
+     */
+    public function __construct(string $firstName, string $lastName, ?string $email = null, ?DateTime $birthDate = null)
+    {
+        $this->firstName = $firstName;
+        $this->lastName = $lastName;
+        $this->email = $email;
+        $this->birthDate = $birthDate;
+    }
+
+    /**
+     * Returns representation of object as string
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $template = '%s';
+        $email = '';
+
+        if ('' !== $this->email && null !== $this->email) {
+            $template .= ' <%s>';
+            $email = $this->email;
+        }
+
+        return sprintf($template, $this->getFullName(), $email);
+    }
+
+    /**
+     * Returns birth date
+     *
+     * @return null|DateTime
+     */
+    public function getBirthDate(): ?DateTime
+    {
+        return $this->birthDate;
+    }
+
+    /**
+     * Returns email address
+     *
+     * @return null|string
+     */
+    public function getEmail(): ?string
+    {
+        return $this->email;
+    }
+
+    /**
+     * Returns first name
+     *
+     * @return string
+     */
+    public function getFirstName(): string
+    {
+        return $this->firstName;
+    }
+
+    /**
+     * Returns the full name
+     *
+     * @param bool $firstNameFirst (optional) If is set to true, first name is the first part (default behaviour).
+     *                             Otherwise - name.
+     * @return string
+     */
+    public function getFullName(bool $firstNameFirst = true): string
+    {
+        $beginning = $this->lastName;
+        $finish = $this->firstName;
+
+        if ($firstNameFirst) {
+            $beginning = $this->firstName;
+            $finish = $this->lastName;
+        }
+
+        return trim(sprintf('%s %s', $beginning, $finish));
+    }
+
+    /**
+     * Returns last name
+     *
+     * @return string
+     */
+    public function getLastName(): string
+    {
+        return $this->lastName;
+    }
+}

src/Type/Base/BaseType.php

@@ -22,7 +22,7 @@ abstract class BaseType
     /**
      * All types
      *
-     * @var array
+     * @var null|array
      */
     private $all;
 
@@ -31,7 +31,7 @@ abstract class BaseType
      *
      * @return array
      */
-    public function getAll()
+    public function getAll(): array
     {
         if (null === $this->all) {
             $this->all = Reflection::getConstants($this);
@@ -43,11 +43,11 @@ abstract class BaseType
     /**
      * Returns information if given type is correct
      *
-     * @param string $type The type to check
+     * @param null|string $type The type to check
      * @return bool
      */
-    public function isCorrectType($type)
+    public static function isCorrectType(?string $type): bool
     {
-        return in_array($type, $this->getAll(), true);
+        return in_array($type, (new static())->getAll());
     }
 }

src/Type/DatePartType.php

@@ -23,40 +23,40 @@ class DatePartType extends BaseType
      *
      * @var string
      */
-    const DAY = 'day';
+    public const DAY = 'day';
 
     /**
      * The "hour" date part
      *
      * @var string
      */
-    const HOUR = 'hour';
+    public const HOUR = 'hour';
 
     /**
      * The "minute" date part
      *
      * @var string
      */
-    const MINUTE = 'minute';
+    public const MINUTE = 'minute';
 
     /**
      * The "month" date part
      *
      * @var string
      */
-    const MONTH = 'month';
+    public const MONTH = 'month';
 
     /**
      * The "second" date part
      *
      * @var string
      */
-    const SECOND = 'second';
+    public const SECOND = 'second';
 
     /**
      * The "year" date part
      *
      * @var string
      */
-    const YEAR = 'year';
+    public const YEAR = 'year';
 }

src/Type/DatePeriod.php

@@ -24,113 +24,134 @@ class DatePeriod extends BaseType
     /**
      * The period constant: last month
      *
-     * @var int
+     * @var string
      */
-    const LAST_MONTH = 4;
+    public const LAST_MONTH = '4';
 
     /**
      * The period constant: last week
      *
-     * @var int
+     * @var string
      */
-    const LAST_WEEK = 1;
+    public const LAST_WEEK = '1';
 
     /**
      * The period constant: last year
      *
-     * @var int
+     * @var string
      */
-    const LAST_YEAR = 7;
+    public const LAST_YEAR = '7';
 
     /**
      * The period constant: next month
      *
-     * @var int
+     * @var string
      */
-    const NEXT_MONTH = 6;
+    public const NEXT_MONTH = '6';
 
     /**
      * The period constant: next week
      *
-     * @var int
+     * @var string
      */
-    const NEXT_WEEK = 3;
+    public const NEXT_WEEK = '3';
 
     /**
      * The period constant: next year
      *
-     * @var int
+     * @var string
      */
-    const NEXT_YEAR = 9;
+    public const NEXT_YEAR = '9';
 
     /**
      * The period constant: this month
      *
-     * @var int
+     * @var string
      */
-    const THIS_MONTH = 5;
+    public const THIS_MONTH = '5';
 
     /**
      * The period constant: this week
      *
-     * @var int
+     * @var string
      */
-    const THIS_WEEK = 2;
+    public const THIS_WEEK = '2';
 
     /**
      * The period constant: this year
      *
-     * @var int
+     * @var string
      */
-    const THIS_YEAR = 8;
+    public const THIS_YEAR = '8';
 
     /**
      * The start date of period
      *
-     * @var DateTime
+     * @var null|DateTime
      */
     private $startDate;
 
     /**
      * The end date of period
      *
-     * @var DateTime
+     * @var null|DateTime
      */
     private $endDate;
 
     /**
      * Class constructor
      *
-     * @param DateTime $startDate (optional) The start date of period
-     * @param DateTime $endDate   (optional) The end date of period
+     * @param null|DateTime $startDate (optional) The start date of period
+     * @param null|DateTime $endDate   (optional) The end date of period
      */
-    public function __construct(DateTime $startDate = null, DateTime $endDate = null)
+    public function __construct(?DateTime $startDate = null, ?DateTime $endDate = null)
     {
         $this->startDate = $startDate;
         $this->endDate = $endDate;
     }
 
+    /**
+     * Returns the end date of period
+     *
+     * @return null|DateTime
+     */
+    public function getEndDate(): ?DateTime
+    {
+        return $this->endDate;
+    }
+
+    /**
+     * Sets the end date of period
+     *
+     * @param null|DateTime $endDate (optional) The end date of period. Default: null.
+     * @return $this
+     */
+    public function setEndDate(?DateTime $endDate = null): self
+    {
+        $this->endDate = $endDate;
+
+        return $this;
+    }
+
     /**
      * Returns formatted one of the period's date: start date or end date
      *
      * @param string $format    Format used to format the date
-     * @param bool   $startDate (optional) If is set to true, start date is formatted. Otherwise - end date.
+     * @param bool   $startDate (optional) If is set to true, start date will be formatted (default behaviour).
+     *                          Otherwise - end date.
      * @return string
      */
-    public function getFormattedDate($format, $startDate = true)
+    public function getFormattedDate(string $format, bool $startDate = true): string
     {
         $date = $this->getEndDate();
 
-        /*
-         * Start date should be formatted?
-         */
+        // Start date should be formatted?
         if ($startDate) {
             $date = $this->getStartDate();
         }
 
-        /*
-         * Unknown date or format is invalid?
-         */
+        // Unknown date or format is invalid?
+        // Nothing to do
         if (null === $date || !Date::isValidDateFormat($format)) {
             return '';
         }
@@ -138,35 +159,12 @@ class DatePeriod extends BaseType
         return $date->format($format);
     }
 
-    /**
-     * Returns the end date of period
-     *
-     * @return DateTime
-     */
-    public function getEndDate()
-    {
-        return $this->endDate;
-    }
-
-    /**
-     * Sets the end date of period
-     *
-     * @param DateTime $endDate (optional) The end date of period
-     * @return $this
-     */
-    public function setEndDate(DateTime $endDate = null)
-    {
-        $this->endDate = $endDate;
-
-        return $this;
-    }
-
     /**
      * Returns the start date of period
      *
-     * @return DateTime
+     * @return null|DateTime
      */
-    public function getStartDate()
+    public function getStartDate(): ?DateTime
     {
         return $this->startDate;
     }
@@ -174,10 +172,10 @@ class DatePeriod extends BaseType
     /**
      * Sets the start date of period
      *
-     * @param DateTime $startDate (optional) The start date of period
+     * @param null|DateTime $startDate (optional) The start date of period. Default: null.
      * @return $this
      */
-    public function setStartDate(DateTime $startDate = null)
+    public function setStartDate(?DateTime $startDate = null): self
     {
         $this->startDate = $startDate;
 

src/Type/OopVisibilityType.php

@@ -17,21 +17,21 @@ class OopVisibilityType extends BaseType
     /**
      * The "private" visibility of OOP
      *
-     * @var int
+     * @var string
      */
-    const IS_PRIVATE = 3;
+    public const IS_PRIVATE = '3';
 
     /**
      * The "protected" visibility of OOP
      *
-     * @var int
+     * @var string
      */
-    const IS_PROTECTED = 2;
+    public const IS_PROTECTED = '2';
 
     /**
      * The "public" visibility of OOP
      *
-     * @var int
+     * @var string
      */
-    const IS_PUBLIC = 1;
+    public const IS_PUBLIC = '1';
 }

src/Utilities/Bootstrap4CssSelector.php

@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Utilities;
+
+/**
+ * Useful methods related to CSS selectors and the Bootstrap4 (front-end component library)
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class Bootstrap4CssSelector
+{
+    /**
+     * Returns selector of container with field's validation error
+     *
+     * @return string
+     */
+    public static function getFieldErrorContainerSelector()
+    {
+        return '.invalid-feedback .form-error-message';
+    }
+
+    /**
+     * Returns selector of field's validation error
+     *
+     * @param string $formName Name of form (value of the "name" attribute)
+     * @param string $fieldId  ID of field (value of the "id" attribute)
+     * @return string
+     */
+    public static function getFieldErrorSelector($formName, $fieldId)
+    {
+        $labelSelector = CssSelector::getLabelSelector($formName, $fieldId);
+
+        if (empty($labelSelector)) {
+            return '';
+        }
+
+        $errorContainerSelector = static::getFieldErrorContainerSelector();
+
+        return sprintf('%s %s', $labelSelector, $errorContainerSelector);
+    }
+
+    /**
+     * Returns selector of field's group
+     *
+     * @param string $formName Name of form (value of the "name" attribute)
+     * @return string
+     */
+    public static function getFieldGroupSelector($formName)
+    {
+        $formSelector = CssSelector::getFormByNameSelector($formName);
+
+        if (empty($formSelector)) {
+            return '';
+        }
+
+        return sprintf('%s .form-group', $formSelector);
+    }
+
+    /**
+     * Returns selector of radio-button's validation error
+     *
+     * @param string $formName      Name of form (value of the "name" attribute)
+     * @param int    $fieldSetIndex Index/Position of the field-set
+     * @return string
+     */
+    public static function getRadioButtonErrorSelector($formName, $fieldSetIndex)
+    {
+        $fieldSetSelector = CssSelector::getFieldSetByIndexSelector($formName, $fieldSetIndex);
+
+        if (empty($fieldSetSelector)) {
+            return '';
+        }
+
+        $errorContainerSelector = static::getFieldErrorContainerSelector();
+
+        return sprintf('%s legend.col-form-label %s', $fieldSetSelector, $errorContainerSelector);
+    }
+}

src/Utilities/Bundle.php

@@ -21,62 +21,50 @@ class Bundle
     /**
      * Returns path of given bundle to view / template with given extension
      *
-     * @param string $viewPath   Path of the view / template, e.g. "MyDirectory/my-template"
+     * @param string $viewPath   Path of the view / template, e.g. "MyDirectory/my-template". Extension is not required.
      * @param string $bundleName Full name of the bundle, e.g. "MyExtraBundle"
      * @param string $extension  (optional) Extension of the view / template (default: "html.twig")
+     * @return null|string
      * @throws IncorrectBundleNameException
-     * @return string|null
      */
-    public static function getBundleViewPath($viewPath, $bundleName, $extension = 'html.twig')
-    {
-        /*
-         * Unknown path, extension of the view / template or name of the bundle?
-         * Nothing to do
-         */
+    public static function getBundleViewPath(
+        string $viewPath,
+        string $bundleName,
+        string $extension = 'html.twig'
+    ): ?string {
+        // Nothing to do, because at least one unknown argument provided
         if (empty($viewPath) || empty($bundleName) || empty($extension)) {
             return null;
         }
 
-        /*
-         * Given name of bundle is invalid?
-         */
+        // Oops, given name of bundle is invalid
         if (!Regex::isValidBundleName($bundleName)) {
             throw IncorrectBundleNameException::create($bundleName);
         }
 
-        /*
-         * Path of the view / template doesn't end with given extension?
-         */
+        // Make sure that path of the view / template ends with given extension
         if (!Regex::endsWith($viewPath, $extension)) {
             $viewPath = sprintf('%s.%s', $viewPath, $extension);
         }
 
-        /*
-         * Prepare short name of bundle and path of view / template with "/" (instead of ":")
-         */
-        $shortBundleName = static::getShortBundleName($bundleName);
-        $viewPath = str_replace(':', '/', $viewPath);
+        // Prepare short name of bundle and path of view / template with "/" (instead of ":")
+        $shortName = static::getShortBundleName($bundleName);
+        $path = str_replace(':', '/', $viewPath);
 
-        return sprintf('@%s/%s', $shortBundleName, $viewPath);
+        return sprintf('@%s/%s', $shortName, $path);
     }
 
     /**
      * Returns short name of bundle (without "Bundle")
      *
      * @param string $fullBundleName Full name of the bundle, e.g. "MyExtraBundle"
+     * @return null|string
      * @throws IncorrectBundleNameException
-     * @return string|null
      */
-    public static function getShortBundleName($fullBundleName)
+    public static function getShortBundleName(string $fullBundleName): ?string
     {
-        /*
-         * Given name of bundle is invalid?
-         */
+        // Oops, given name of bundle is invalid
         if (!Regex::isValidBundleName($fullBundleName)) {
-            if (!is_string($fullBundleName)) {
-                $fullBundleName = gettype($fullBundleName);
-            }
-
             throw new IncorrectBundleNameException($fullBundleName);
         }
 

src/Utilities/Composer.php

@@ -8,8 +8,6 @@
 
 namespace Meritoo\Common\Utilities;
 
-use stdClass;
-
 /**
  * Useful Composer-related methods (only static functions)
  *
@@ -23,23 +21,18 @@ class Composer
      *
      * @var string
      */
-    const FILE_NAME_MAIN = 'composer.json';
+    public const FILE_NAME_MAIN = 'composer.json';
 
     /**
      * Returns value from composer.json file
      *
      * @param string $composerJsonPath Path of composer.json file
      * @param string $nodeName         Name of node who value should be returned
-     * @return string|null
+     * @return null|string
      */
-    public static function getValue($composerJsonPath, $nodeName)
+    public static function getValue(string $composerJsonPath, string $nodeName): ?string
     {
-        $composerJsonString = is_string($composerJsonPath);
-        $composerJsonReadable = false;
-
-        if ($composerJsonString) {
-            $composerJsonReadable = is_readable($composerJsonPath);
-        }
+        $composerJsonReadable = is_readable($composerJsonPath);
 
         /*
          * Provided path or name of node are invalid?
@@ -48,12 +41,12 @@ class Composer
          *
          * Nothing to do
          */
-        if (!$composerJsonString || !is_string($nodeName) || !$composerJsonReadable || empty($nodeName)) {
+        if (!$composerJsonReadable || empty($nodeName)) {
             return null;
         }
 
         $content = file_get_contents($composerJsonPath);
-        $data = json_decode($content);
+        $data = json_decode($content, false);
 
         /*
          * Unknown data from the composer.json file or there is no node with given name?
@@ -63,7 +56,6 @@ class Composer
             return null;
         }
 
-        /* @var stdClass $data */
         return $data->{$nodeName};
     }
 }

src/Utilities/CssSelector.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Utilities;
+
+use Meritoo\Common\Traits\CssSelector\FormCssSelector;
+
+/**
+ * Useful methods related to CSS selectors
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class CssSelector
+{
+    use FormCssSelector;
+}

src/Utilities/Date.php

@@ -29,7 +29,7 @@ class Date
      *
      * @var string
      */
-    const DATE_DIFFERENCE_UNIT_DAYS = 'days';
+    public const DATE_DIFFERENCE_UNIT_DAYS = 'days';
 
     /**
      * The 'hours' unit of date difference.
@@ -37,7 +37,7 @@ class Date
      *
      * @var string
      */
-    const DATE_DIFFERENCE_UNIT_HOURS = 'hours';
+    public const DATE_DIFFERENCE_UNIT_HOURS = 'hours';
 
     /**
      * The 'minutes' unit of date difference.
@@ -45,7 +45,7 @@ class Date
      *
      * @var string
      */
-    const DATE_DIFFERENCE_UNIT_MINUTES = 'minutes';
+    public const DATE_DIFFERENCE_UNIT_MINUTES = 'minutes';
 
     /**
      * The 'months' unit of date difference.
@@ -53,7 +53,7 @@ class Date
      *
      * @var string
      */
-    const DATE_DIFFERENCE_UNIT_MONTHS = 'months';
+    public const DATE_DIFFERENCE_UNIT_MONTHS = 'months';
 
     /**
      * The 'years' unit of date difference.
@@ -61,123 +61,16 @@ class Date
      *
      * @var string
      */
-    const DATE_DIFFERENCE_UNIT_YEARS = 'years';
-
-    /**
-     * Returns start and end date for given period.
-     * The dates are returned in an array with indexes 'start' and 'end'.
-     *
-     * @param int $period The period, type of period. One of DatePeriod class constants, e.g. DatePeriod::LAST_WEEK.
-     * @throws Exception
-     * @return null|DatePeriod
-     */
-    public static function getDatesForPeriod($period)
-    {
-        /*
-         * Type of period is incorrect?
-         * Nothing to do
-         */
-        if (!(new DatePeriod())->isCorrectType($period)) {
-            return null;
-        }
-
-        $dateStart = null;
-        $dateEnd = null;
-
-        switch ($period) {
-            case DatePeriod::LAST_WEEK:
-                $thisWeekStart = new DateTime('this week');
-
-                $dateStart = clone $thisWeekStart;
-                $dateEnd = clone $thisWeekStart;
-
-                $dateStart->sub(new DateInterval('P7D'));
-                $dateEnd->sub(new DateInterval('P1D'));
-
-                break;
-            case DatePeriod::THIS_WEEK:
-                $dateStart = new DateTime('this week');
-
-                $dateEnd = clone $dateStart;
-                $dateEnd->add(new DateInterval('P6D'));
-
-                break;
-            case DatePeriod::NEXT_WEEK:
-                $dateStart = new DateTime('this week');
-                $dateStart->add(new DateInterval('P7D'));
-
-                $dateEnd = clone $dateStart;
-                $dateEnd->add(new DateInterval('P6D'));
-
-                break;
-            case DatePeriod::LAST_MONTH:
-                $dateStart = new DateTime('first day of last month');
-                $dateEnd = new DateTime('last day of last month');
-
-                break;
-            case DatePeriod::THIS_MONTH:
-                $lastMonth = self::getDatesForPeriod(DatePeriod::LAST_MONTH);
-                $nextMonth = self::getDatesForPeriod(DatePeriod::NEXT_MONTH);
-
-                $dateStart = $lastMonth->getEndDate();
-                $dateStart->add(new DateInterval('P1D'));
-
-                $dateEnd = $nextMonth->getStartDate();
-                $dateEnd->sub(new DateInterval('P1D'));
-
-                break;
-            case DatePeriod::NEXT_MONTH:
-                $dateStart = new DateTime('first day of next month');
-                $dateEnd = new DateTime('last day of next month');
-
-                break;
-            case DatePeriod::LAST_YEAR:
-            case DatePeriod::THIS_YEAR:
-            case DatePeriod::NEXT_YEAR:
-                $dateStart = new DateTime();
-                $dateEnd = new DateTime();
-
-                if (DatePeriod::LAST_YEAR == $period || DatePeriod::NEXT_YEAR == $period) {
-                    $yearDifference = 1;
-
-                    if (DatePeriod::LAST_YEAR == $period) {
-                        $yearDifference *= -1;
-                    }
-
-                    $modifyString = sprintf('%s year', $yearDifference);
-                    $dateStart->modify($modifyString);
-                    $dateEnd->modify($modifyString);
-                }
-
-                $year = $dateStart->format('Y');
-                $dateStart->setDate($year, 1, 1);
-                $dateEnd->setDate($year, 12, 31);
-
-                break;
-        }
-
-        /*
-         * Start or end date is unknown?
-         * Nothing to do
-         */
-        if (null === $dateStart || null === $dateEnd) {
-            return null;
-        }
-
-        $dateStart->setTime(0, 0, 0);
-        $dateEnd->setTime(23, 59, 59);
-
-        return new DatePeriod($dateStart, $dateEnd);
-    }
+    public const DATE_DIFFERENCE_UNIT_YEARS = 'years';
 
     /**
      * Generates and returns random time (the hour, minute and second values)
      *
      * @param string $format (optional) Format of returned value. A string acceptable by the DateTime::format()
      *                       method.
-     * @return string|null
+     * @return null|string
      */
-    public static function generateRandomTime($format = 'H:i:s')
+    public static function generateRandomTime($format = 'H:i:s'): ?string
     {
         $dateTime = new DateTime();
 
@@ -205,131 +98,49 @@ class Date
             $seconds[] = $i;
         }
 
-        /*
-         * Prepare random time (hour, minute and second)
-         */
+        // Prepare random time (hour, minute and second)
         $hour = $hours[array_rand($hours)];
         $minute = $minutes[array_rand($minutes)];
         $second = $seconds[array_rand($seconds)];
 
         return $dateTime
             ->setTime($hour, $minute, $second)
-            ->format($format);
+            ->format($format)
+        ;
     }
 
     /**
      * Returns current day of week
      *
-     * @throws UnknownDatePartTypeException
      * @return int
      */
-    public static function getCurrentDayOfWeek()
+    public static function getCurrentDayOfWeek(): int
     {
         $now = new DateTime();
 
-        $year = $now->format('Y');
-        $month = $now->format('m');
-        $day = $now->format('d');
+        $year = (int) $now->format('Y');
+        $month = (int) $now->format('m');
+        $day = (int) $now->format('d');
 
         return self::getDayOfWeek($year, $month, $day);
     }
 
-    /**
-     * Returns day of week (number 0 to 6, 0 - sunday, 6 - saturday).
-     * Based on the Zeller's algorithm (http://pl.wikipedia.org/wiki/Kalendarz_wieczny).
-     *
-     * @param int $year  The year value
-     * @param int $month The month value
-     * @param int $day   The day value
-     *
-     * @throws UnknownDatePartTypeException
-     * @return int
-     */
-    public static function getDayOfWeek($year, $month, $day)
-    {
-        $year = (int)$year;
-        $month = (int)$month;
-        $day = (int)$day;
-
-        /*
-         * Oops, incorrect year
-         */
-        if ($year <= 0) {
-            throw UnknownDatePartTypeException::createException(DatePartType::YEAR, $year);
-        }
-
-        /*
-         * Oops, incorrect month
-         */
-        if ($month < 1 || $month > 12) {
-            throw UnknownDatePartTypeException::createException(DatePartType::MONTH, $month);
-        }
-
-        /*
-         * Oops, incorrect day
-         */
-        if ($day < 1 || $day > 31) {
-            throw UnknownDatePartTypeException::createException(DatePartType::DAY, $day);
-        }
-
-        if ($month < 3) {
-            $count = 0;
-            $yearValue = $year - 1;
-        } else {
-            $count = 2;
-            $yearValue = $year;
-        }
-
-        $firstPart = floor(23 * $month / 9);
-        $secondPart = floor($yearValue / 4);
-        $thirdPart = floor($yearValue / 100);
-        $fourthPart = floor($yearValue / 400);
-
-        return ($firstPart + $day + 4 + $year + $secondPart - $thirdPart + $fourthPart - $count) % 7;
-    }
-
     /**
      * Returns based on locale name of current weekday
      *
      * @return string
      */
-    public static function getCurrentDayOfWeekName()
+    public static function getCurrentDayOfWeekName(): string
     {
         $now = new DateTime();
 
-        $year = $now->format('Y');
-        $month = $now->format('m');
-        $day = $now->format('d');
+        $year = (int) $now->format('Y');
+        $month = (int) $now->format('m');
+        $day = (int) $now->format('d');
 
         return self::getDayOfWeekName($year, $month, $day);
     }
 
-    /**
-     * Returns name of weekday based on locale
-     *
-     * @param int $year  The year value
-     * @param int $month The month value
-     * @param int $day   The day value
-     * @return string
-     */
-    public static function getDayOfWeekName($year, $month, $day)
-    {
-        $hour = 0;
-        $minute = 0;
-        $second = 0;
-
-        $time = mktime($hour, $minute, $second, $month, $day, $year);
-        $name = strftime('%A', $time);
-
-        $encoding = mb_detect_encoding($name);
-
-        if (false === $encoding) {
-            $name = mb_convert_encoding($name, 'UTF-8', 'ISO-8859-2');
-        }
-
-        return $name;
-    }
-
     /**
      * Returns difference between given dates.
      *
@@ -345,9 +156,9 @@ class Date
      * If the unit of date difference is null, all units are returned in array (units are keys of the array).
      * Otherwise - one, integer value is returned.
      *
-     * @param string|DateTime $dateStart      The start date
-     * @param string|DateTime $dateEnd        The end date
-     * @param int             $differenceUnit (optional) Unit of date difference. One of this class
+     * @param DateTime|string $dateStart      The start date
+     * @param DateTime|string $dateEnd        The end date
+     * @param string          $differenceUnit (optional) Unit of date difference. One of this class
      *                                        DATE_DIFFERENCE_UNIT_* constants. If is set to null all units are
      *                                        returned in the array.
      * @return array|int
@@ -368,11 +179,11 @@ class Date
             return null;
         }
 
-        $dateStart = self::getDateTime($dateStart, true);
-        $dateEnd = self::getDateTime($dateEnd, true);
+        $start = self::getDateTime($dateStart, true);
+        $end = self::getDateTime($dateEnd, true);
 
         $difference = [];
-        $dateDiff = $dateEnd->getTimestamp() - $dateStart->getTimestamp();
+        $dateDiff = $end->getTimestamp() - $start->getTimestamp();
 
         $daysInSeconds = 0;
         $hoursInSeconds = 0;
@@ -390,85 +201,71 @@ class Date
             self::DATE_DIFFERENCE_UNIT_MINUTES,
         ];
 
-        if (null === $differenceUnit || self::DATE_DIFFERENCE_UNIT_YEARS == $differenceUnit) {
-            $diff = $dateEnd->diff($dateStart);
+        $differenceYear = self::DATE_DIFFERENCE_UNIT_YEARS === $differenceUnit;
+        $differenceMonth = self::DATE_DIFFERENCE_UNIT_MONTHS === $differenceUnit;
+        $differenceMinutes = self::DATE_DIFFERENCE_UNIT_MINUTES === $differenceUnit;
 
-            /*
-             * Difference between dates in years should be returned only?
-             */
-            if (self::DATE_DIFFERENCE_UNIT_YEARS == $differenceUnit) {
+        if (null === $differenceUnit || $differenceYear) {
+            $diff = $end->diff($start);
+
+            // Difference between dates in years should be returned only?
+            if ($differenceYear) {
                 return $diff->y;
             }
 
             $difference[self::DATE_DIFFERENCE_UNIT_YEARS] = $diff->y;
         }
 
-        if (null === $differenceUnit || self::DATE_DIFFERENCE_UNIT_MONTHS == $differenceUnit) {
-            $diff = $dateEnd->diff($dateStart);
+        if (null === $differenceUnit || $differenceMonth) {
+            $diff = $end->diff($start);
 
-            /*
-             * Difference between dates in months should be returned only?
-             */
-            if (self::DATE_DIFFERENCE_UNIT_MONTHS == $differenceUnit) {
+            // Difference between dates in months should be returned only?
+            if ($differenceMonth) {
                 return $diff->m;
             }
 
             $difference[self::DATE_DIFFERENCE_UNIT_MONTHS] = $diff->m;
         }
 
-        if (null === $differenceUnit || in_array($differenceUnit, $relatedUnits)) {
-            $days = (int)floor($dateDiff / $daySeconds);
+        if (null === $differenceUnit || in_array($differenceUnit, $relatedUnits, true)) {
+            $days = (int) floor($dateDiff / $daySeconds);
 
-            /*
-             * Difference between dates in days should be returned only?
-             */
-            if (self::DATE_DIFFERENCE_UNIT_DAYS == $differenceUnit) {
+            // Difference between dates in days should be returned only?
+            if (self::DATE_DIFFERENCE_UNIT_DAYS === $differenceUnit) {
                 return $days;
             }
 
-            /*
-             * All units should be returned?
-             */
+            // All units should be returned?
             if (null === $differenceUnit) {
                 $difference[self::DATE_DIFFERENCE_UNIT_DAYS] = $days;
             }
 
-            /*
-             * Calculation for later usage
-             */
+            // Calculation for later usage
             $daysInSeconds = $days * $daySeconds;
         }
 
-        if (null === $differenceUnit || in_array($differenceUnit, $relatedUnits)) {
-            $hours = (int)floor(($dateDiff - $daysInSeconds) / $hourSeconds);
+        if (null === $differenceUnit || in_array($differenceUnit, $relatedUnits, true)) {
+            $hours = (int) floor(($dateDiff - $daysInSeconds) / $hourSeconds);
 
-            /*
-             * Difference between dates in hours should be returned only?
-             */
-            if (self::DATE_DIFFERENCE_UNIT_HOURS == $differenceUnit) {
+            // Difference between dates in hours should be returned only?
+            if (self::DATE_DIFFERENCE_UNIT_HOURS === $differenceUnit) {
                 return $hours;
             }
 
-            /*
-             * All units should be returned?
-             */
+            // All units should be returned?
             if (null === $differenceUnit) {
                 $difference[self::DATE_DIFFERENCE_UNIT_HOURS] = $hours;
             }
 
-            /*
-             * Calculation for later usage
-             */
+            // Calculation for later usage
             $hoursInSeconds = $hours * $hourSeconds;
         }
 
-        if (null === $differenceUnit || self::DATE_DIFFERENCE_UNIT_MINUTES == $differenceUnit) {
-            $minutes = (int)floor(($dateDiff - $daysInSeconds - $hoursInSeconds) / 60);
+        if (null === $differenceUnit || $differenceMinutes) {
+            $minutes = (int) floor(($dateDiff - $daysInSeconds - $hoursInSeconds) / 60);
 
-            /*
-             * Difference between dates in minutes should be returned only?
-             */
-            if (self::DATE_DIFFERENCE_UNIT_MINUTES == $differenceUnit) {
+            // Difference between dates in minutes should be returned only?
+            if ($differenceMinutes) {
                 return $minutes;
             }
 
@@ -478,87 +275,6 @@ class Date
         return $difference;
     }
 
-    /**
-     * Returns collection / set of dates for given start date and count of dates.
-     * Start from given date, add next, iterated value to given date interval and returns requested count of dates.
-     *
-     * @param DateTime $startDate        The start date. Start of the collection / set.
-     * @param int      $datesCount       Count of dates in resulting collection / set
-     * @param string   $intervalTemplate (optional) Template used to build date interval. It should contain "%d" as the
-     *                                   placeholder which is replaced with a number that represents each iteration.
-     *                                   Default: interval for days.
-     * @throws Exception
-     * @return array
-     */
-    public static function getDatesCollection(DateTime $startDate, $datesCount, $intervalTemplate = 'P%dD')
-    {
-        $dates = [];
-
-        /*
-         * The template used to build date interval have to be string.
-         * Otherwise cannot run preg_match() function and an error occurs.
-         */
-        if (is_string($intervalTemplate)) {
-            /*
-             * Let's verify the interval template. It should contains the "%d" placeholder and something before and
-             * after it.
-             *
-             * Examples:
-             * - P%dD
-             * - P%dM
-             * - P1Y%dMT1H
-             */
-            $intervalPattern = '/^(\w*)\%d(\w*)$/';
-            $matches = [];
-            $matchCount = preg_match($intervalPattern, $intervalTemplate, $matches);
-
-            if ($matchCount > 0 && (!empty($matches[1]) || !empty($matches[2]))) {
-                $datesCount = (int)$datesCount;
-
-                for ($index = 1; $index <= $datesCount; ++$index) {
-                    $date = clone $startDate;
-                    $dates[$index] = $date->add(new DateInterval(sprintf($intervalTemplate, $index)));
-                }
-            }
-        }
-
-        return $dates;
-    }
-
-    /**
-     * Returns random date based on given start date
-     *
-     * @param DateTime $startDate        The start date. Start of the random date.
-     * @param int      $start            (optional) Start of random partition
-     * @param int      $end              (optional) End of random partition
-     * @param string   $intervalTemplate (optional) Template used to build date interval. The placeholder is replaced
-     *                                   with next, iterated value.
-     * @throws Exception
-     * @return DateTime
-     */
-    public static function getRandomDate(DateTime $startDate = null, $start = 1, $end = 100, $intervalTemplate = 'P%sD')
-    {
-        if (null === $startDate) {
-            $startDate = new DateTime();
-        }
-
-        $start = (int)$start;
-        $end = (int)$end;
-
-        /*
-         * Incorrect end of random partition?
-         * Use start as the end of random partition
-         */
-        if ($end < $start) {
-            $end = $start;
-        }
-
-        $randomDate = clone $startDate;
-        $randomInterval = new DateInterval(sprintf($intervalTemplate, rand($start, $end)));
-
-        return $randomDate->add($randomInterval);
-    }
-
     /**
      * Returns the DateTime object for given value.
      * If the DateTime object cannot be created, false is returned.
@@ -566,11 +282,12 @@ class Date
      * @param mixed  $value                The value which maybe is a date
      * @param bool   $allowCompoundFormats (optional) If is set to true, the compound formats used to create an
      *                                     instance of DateTime class are allowed (e.g. "now", "last day of next
-     *                                     month", "yyyy"). Otherwise - not and every incorrect value is refused.
+     *                                     month", "yyyy"). Otherwise - not and every incorrect value is refused
+     *                                     (default behaviour).
      * @param string $dateFormat           (optional) Format of date used to verify if given value is actually a date.
      *                                     It should be format matched to the given value, e.g. "Y-m-d H:i" for
-     *                                     "2015-01-01 10:00" value.
-     * @return DateTime|bool
+     *                                     "2015-01-01 10:00" value. Default: "Y-m-d".
+     * @return bool|DateTime
      */
     public static function getDateTime($value, $allowCompoundFormats = false, $dateFormat = 'Y-m-d')
     {
@@ -637,7 +354,7 @@ class Date
                          * So, I have to refuse those special compound formats if they are not explicitly declared as
                          * compound (2nd argument of this method, set to false by default)
                          */
-                        if (in_array($value, $specialFormats)) {
+                        if (in_array($value, $specialFormats, true)) {
                             return false;
                         }
                     }
@@ -645,12 +362,10 @@ class Date
                  * Verify instance of the DateTime created by constructor and by createFromFormat() method.
                  * After formatting, these dates should be the same.
                  */
-                else {
-                    if ($dateFromFormat->format($dateFormat) === $value) {
-                        return $date;
-                    }
+                elseif ($dateFromFormat->format($dateFormat) === $value) {
+                    return $date;
                 }
-            } catch (\Exception $exception) {
+            } catch (Exception $exception) {
                 if (!$allowCompoundFormats) {
                     return false;
                 }
@@ -662,15 +377,284 @@ class Date
              */
             $dateString = (new DateTime())->format($value);
 
-            if ($dateString != $value) {
+            if ($dateString !== (string) $value) {
                 return new DateTime($dateString);
             }
-        } catch (\Exception $exception) {
+        } catch (Exception $exception) {
         }
 
         return false;
     }
 
+    /**
+     * Returns collection / set of dates for given start date and count of dates.
+     * Start from given date, add next, iterated value to given date interval and returns requested count of dates.
+     *
+     * @param DateTime $startDate        The start date. Start of the collection / set.
+     * @param int      $datesCount       Count of dates in resulting collection / set
+     * @param string   $intervalTemplate (optional) Template used to build date interval. It should contain "%d" as the
+     *                                   placeholder which is replaced with a number that represents each iteration.
+     *                                   Default: interval for days.
+     * @return array
+     * @throws Exception
+     */
+    public static function getDatesCollection(DateTime $startDate, $datesCount, $intervalTemplate = 'P%dD'): array
+    {
+        $dates = [];
+
+        /*
+         * The template used to build date interval have to be string.
+         * Otherwise cannot run preg_match() function and an error occurs.
+         */
+        if (is_string($intervalTemplate)) {
+            /*
+             * Let's verify the interval template. It should contains the "%d" placeholder and something before and
+             * after it.
+             *
+             * Examples:
+             * - P%dD
+             * - P%dM
+             * - P1Y%dMT1H
+             */
+            $intervalPattern = '/^(\w*)\%d(\w*)$/';
+            $matches = [];
+            $matchCount = preg_match($intervalPattern, $intervalTemplate, $matches);
+
+            if ($matchCount > 0 && (!empty($matches[1]) || !empty($matches[2]))) {
+                $datesCount = (int) $datesCount;
+
+                for ($index = 1; $index <= $datesCount; ++$index) {
+                    $date = clone $startDate;
+                    $dates[$index] = $date->add(new DateInterval(sprintf($intervalTemplate, $index)));
+                }
+            }
+        }
+
+        return $dates;
+    }
+
+    /**
+     * Returns date's period (that contains start and end date) for given period
+     *
+     * @param string $period The period, type of period. One of DatePeriod class constants, e.g. DatePeriod::LAST_WEEK.
+     * @return null|DatePeriod
+     * @throws Exception
+     */
+    public static function getDatesForPeriod(string $period): ?DatePeriod
+    {
+        /*
+         * Type of period is incorrect?
+         * Nothing to do
+         */
+        if (!DatePeriod::isCorrectType($period)) {
+            return null;
+        }
+
+        $dateStart = null;
+        $dateEnd = null;
+
+        switch ($period) {
+            case DatePeriod::LAST_WEEK:
+                $thisWeekStart = new DateTime('this week');
+
+                $dateStart = clone $thisWeekStart;
+                $dateEnd = clone $thisWeekStart;
+
+                $dateStart->sub(new DateInterval('P7D'));
+                $dateEnd->sub(new DateInterval('P1D'));
+
+                break;
+            case DatePeriod::THIS_WEEK:
+                $dateStart = new DateTime('this week');
+
+                $dateEnd = clone $dateStart;
+                $dateEnd->add(new DateInterval('P6D'));
+
+                break;
+            case DatePeriod::NEXT_WEEK:
+                $dateStart = new DateTime('this week');
+                $dateStart->add(new DateInterval('P7D'));
+
+                $dateEnd = clone $dateStart;
+                $dateEnd->add(new DateInterval('P6D'));
+
+                break;
+            case DatePeriod::LAST_MONTH:
+                $dateStart = new DateTime('first day of last month');
+                $dateEnd = new DateTime('last day of last month');
+
+                break;
+            case DatePeriod::THIS_MONTH:
+                $lastMonth = self::getDatesForPeriod(DatePeriod::LAST_MONTH);
+                $nextMonth = self::getDatesForPeriod(DatePeriod::NEXT_MONTH);
+
+                if (null !== $lastMonth) {
+                    $dateStart = $lastMonth->getEndDate();
+
+                    if (null !== $dateStart) {
+                        $dateStart->add(new DateInterval('P1D'));
+                    }
+                }
+
+                if (null !== $nextMonth) {
+                    $dateEnd = $nextMonth->getStartDate();
+
+                    if (null !== $dateEnd) {
+                        $dateEnd->sub(new DateInterval('P1D'));
+                    }
+                }
+
+                break;
+            case DatePeriod::NEXT_MONTH:
+                $dateStart = new DateTime('first day of next month');
+                $dateEnd = new DateTime('last day of next month');
+
+                break;
+            case DatePeriod::LAST_YEAR:
+            case DatePeriod::THIS_YEAR:
+            case DatePeriod::NEXT_YEAR:
+                $dateStart = new DateTime();
+                $dateEnd = new DateTime();
+
+                $yearPeriod = [
+                    DatePeriod::LAST_YEAR,
+                    DatePeriod::NEXT_YEAR,
+                ];
+
+                if (in_array($period, $yearPeriod, true)) {
+                    $yearDifference = 1;
+
+                    if (DatePeriod::LAST_YEAR === $period) {
+                        $yearDifference *= -1;
+                    }
+
+                    $modifyString = sprintf('%s year', $yearDifference);
+                    $dateStart->modify($modifyString);
+                    $dateEnd->modify($modifyString);
+                }
+
+                $year = (int) $dateStart->format('Y');
+                $dateStart->setDate($year, 1, 1);
+                $dateEnd->setDate($year, 12, 31);
+
+                break;
+        }
+
+        /*
+         * Start or end date is unknown?
+         * Nothing to do
+         */
+        if (null === $dateStart || null === $dateEnd) {
+            return null;
+        }
+
+        $dateStart->setTime(0, 0);
+        $dateEnd->setTime(23, 59, 59);
+
+        return new DatePeriod($dateStart, $dateEnd);
+    }
+
+    /**
+     * Returns day of week (number 0 to 6, 0 - sunday, 6 - saturday).
+     * Based on the Zeller's algorithm (https://en.wikipedia.org/wiki/Perpetual_calendar).
+     *
+     * @param int $year  The year value
+     * @param int $month The month value
+     * @param int $day   The day value
+     *
+     * @return int
+     * @throws UnknownDatePartTypeException
+     */
+    public static function getDayOfWeek(int $year, int $month, int $day): int
+    {
+        static::validateYear($year);
+        static::validateMonth($month);
+        static::validateDay($day);
+
+        if ($month < 3) {
+            $count = 0;
+            $yearValue = $year - 1;
+        } else {
+            $count = 2;
+            $yearValue = $year;
+        }
+
+        $firstPart = floor(23 * $month / 9);
+        $secondPart = floor($yearValue / 4);
+        $thirdPart = floor($yearValue / 100);
+        $fourthPart = floor($yearValue / 400);
+
+        return ($firstPart + $day + 4 + $year + $secondPart - $thirdPart + $fourthPart - $count) % 7;
+    }
+
+    /**
+     * Returns name of weekday based on locale
+     *
+     * @param int $year  The year value
+     * @param int $month The month value
+     * @param int $day   The day value
+     * @return string
+     */
+    public static function getDayOfWeekName($year, $month, $day): string
+    {
+        $hour = 0;
+        $minute = 0;
+        $second = 0;
+
+        $time = mktime($hour, $minute, $second, $month, $day, $year);
+        $name = strftime('%A', $time);
+
+        $encoding = mb_detect_encoding($name);
+
+        if (false === $encoding) {
+            $name = mb_convert_encoding($name, 'UTF-8', 'ISO-8859-2');
+        }
+
+        return $name;
+    }
+
+    /**
+     * Returns random date based on given start date
+     *
+     * @param DateTime $startDate        (optional) Beginning of the random date. If not provided, current date will
+     *                                   be used (default behaviour).
+     * @param int      $start            (optional) Start of random partition. If not provided, 1 will be used
+     *                                   (default behaviour).
+     * @param int      $end              (optional) End of random partition. If not provided, 100 will be used
+     *                                   (default behaviour).
+     * @param string   $intervalTemplate (optional) Template used to build date interval. The placeholder is replaced
+     *                                   with next, iterated value. If not provided, "P%sD" will be used (default
+     *                                   behaviour).
+     * @return DateTime
+     * @throws Exception
+     */
+    public static function getRandomDate(
+        DateTime $startDate = null,
+        $start = 1,
+        $end = 100,
+        $intervalTemplate = 'P%sD'
+    ): DateTime {
+        if (null === $startDate) {
+            $startDate = new DateTime();
+        }
+
+        $start = (int) $start;
+        $end = (int) $end;
+
+        /*
+         * Incorrect end of random partition?
+         * Use start as the end of random partition
+         */
+        if ($end < $start) {
+            $end = $start;
+        }
+
+        $randomDate = clone $startDate;
+        $randomInterval = new DateInterval(sprintf($intervalTemplate, random_int($start, $end)));
+
+        return $randomDate->add($randomInterval);
+    }
+
     /**
      * Returns information if given value is valid date
      *
@@ -680,7 +664,7 @@ class Date
      *                                    month", "yyyy"). Otherwise - not and every incorrect value is refused.
      * @return bool
      */
-    public static function isValidDate($value, $allowCompoundFormats = false)
+    public static function isValidDate($value, $allowCompoundFormats = false): bool
     {
         return self::getDateTime($value, $allowCompoundFormats) instanceof DateTime;
     }
@@ -691,38 +675,77 @@ class Date
      * @param string $format The validated format of date
      * @return bool
      */
-    public static function isValidDateFormat($format)
+    public static function isValidDateFormat($format): bool
     {
         if (empty($format) || !is_string($format)) {
             return false;
         }
 
-        /*
-         * Datetime to string
-         */
         $formatted = (new DateTime())->format($format);
 
-        /*
-         * Formatted date it's the format who is validated?
-         * The format is invalid
-         */
-        if ($formatted == $format) {
+        // Formatted date it's the format who is validated?
+        // The format is invalid
+        if ($formatted === $format) {
             return false;
         }
 
-        /*
-         * Validate the format used to create the datetime
-         */
+        // Validate the format used to create the datetime
         $fromFormat = DateTime::createFromFormat($format, $formatted);
 
-        /*
-         * It's instance of DateTime?
-         * The format is valid
-         */
+        // It's instance of DateTime?
+        // The format is valid
         if ($fromFormat instanceof DateTime) {
             return true;
         }
 
         return $fromFormat instanceof DateTime;
     }
+
+    /**
+     * Verifies/validates given day
+     *
+     * @param int $day Day to verify/validate
+     * @throws UnknownDatePartTypeException
+     */
+    private static function validateDay(int $day): void
+    {
+        // Oops, given day is incorrect
+        if ($day >= 1 && $day <= 31) {
+            return;
+        }
+
+        throw UnknownDatePartTypeException::createException(DatePartType::DAY, $day);
+    }
+
+    /**
+     * Verifies/validates given month
+     *
+     * @param int $month Month to verify/validate
+     * @throws UnknownDatePartTypeException
+     */
+    private static function validateMonth(int $month): void
+    {
+        // Oops, given month is incorrect
+        if ($month >= 1 && $month <= 12) {
+            return;
+        }
+
+        throw UnknownDatePartTypeException::createException(DatePartType::MONTH, $month);
+    }
+
+    /**
+     * Verifies/validates given year
+     *
+     * @param int $year Year to verify/validate
+     * @throws UnknownDatePartTypeException
+     */
+    private static function validateYear(int $year): void
+    {
+        // Oops, given year is incorrect
+        if ($year >= 0) {
+            return;
+        }
+
+        throw UnknownDatePartTypeException::createException(DatePartType::YEAR, $year);
+    }
 }

src/Utilities/Locale.php

@@ -16,51 +16,6 @@ namespace Meritoo\Common\Utilities;
  */
 class Locale
 {
-    /**
-     * Sets locale for given category using given language and country code
-     *
-     * @param int    $category     Named constant specifying the category of the functions affected by the locale
-     *                             setting. It's the same constant as required by setlocale() function.
-     * @param string $languageCode Language code, in ISO 639-1 format. Short form of the locale, e.g. "fr".
-     * @param string $countryCode  (optional) Country code, in ISO 3166-1 alpha-2 format, e.g. "FR"
-     * @return false|string
-     *
-     * Available categories (values of $category argument):
-     * - LC_ALL for all of the below
-     * - LC_COLLATE for string comparison, see strcoll()
-     * - LC_CTYPE for character classification and conversion, for example strtoupper()
-     * - LC_MONETARY for localeconv()
-     * - LC_NUMERIC for decimal separator (See also localeconv())
-     * - LC_TIME for date and time formatting with strftime()
-     * - LC_MESSAGES for system responses (available if PHP was compiled with libintl)
-     */
-    public static function setLocale($category, $languageCode, $countryCode = '')
-    {
-        $category = (int)$category;
-
-        if (is_string($languageCode)) {
-            $languageCode = trim($languageCode);
-        }
-
-        $availableCategories = [
-            LC_ALL,
-            LC_COLLATE,
-            LC_CTYPE,
-            LC_MONETARY,
-            LC_NUMERIC,
-            LC_TIME,
-            LC_MESSAGES,
-        ];
-
-        if (empty($languageCode) || !in_array($category, $availableCategories)) {
-            return false;
-        }
-
-        $localeLongForm = self::getLongForm($languageCode, $countryCode);
-
-        return setlocale($category, $localeLongForm);
-    }
-
     /**
      * Returns locale for given category
      *
@@ -123,4 +78,49 @@ class Locale
 
         return sprintf('%s_%s%s', $languageCode, strtoupper($countryCode), $encoding);
     }
+
+    /**
+     * Sets locale for given category using given language and country code
+     *
+     * @param int    $category     Named constant specifying the category of the functions affected by the locale
+     *                             setting. It's the same constant as required by setlocale() function.
+     * @param string $languageCode Language code, in ISO 639-1 format. Short form of the locale, e.g. "fr".
+     * @param string $countryCode  (optional) Country code, in ISO 3166-1 alpha-2 format, e.g. "FR"
+     * @return false|string
+     *
+     * Available categories (values of $category argument):
+     * - LC_ALL for all of the below
+     * - LC_COLLATE for string comparison, see strcoll()
+     * - LC_CTYPE for character classification and conversion, for example strtoupper()
+     * - LC_MONETARY for localeconv()
+     * - LC_NUMERIC for decimal separator (See also localeconv())
+     * - LC_TIME for date and time formatting with strftime()
+     * - LC_MESSAGES for system responses (available if PHP was compiled with libintl)
+     */
+    public static function setLocale($category, $languageCode, $countryCode = '')
+    {
+        $category = (int) $category;
+
+        if (is_string($languageCode)) {
+            $languageCode = trim($languageCode);
+        }
+
+        $availableCategories = [
+            LC_ALL,
+            LC_COLLATE,
+            LC_CTYPE,
+            LC_MONETARY,
+            LC_NUMERIC,
+            LC_TIME,
+            LC_MESSAGES,
+        ];
+
+        if (empty($languageCode) || !in_array($category, $availableCategories, true)) {
+            return false;
+        }
+
+        $localeLongForm = self::getLongForm($languageCode, $countryCode);
+
+        return setlocale($category, $localeLongForm);
+    }
 }

src/Utilities/QueryBuilderUtility.php

@@ -10,7 +10,6 @@ namespace Meritoo\Common\Utilities;
 
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\ORM\EntityManager;
-use Doctrine\ORM\OptimisticLockException;
 use Doctrine\ORM\Query\Expr\Join;
 use Doctrine\ORM\Query\Parameter;
 use Doctrine\ORM\QueryBuilder;
@@ -23,168 +22,6 @@ use Doctrine\ORM\QueryBuilder;
  */
 class QueryBuilderUtility
 {
-    /**
-     * Returns root alias of given query builder.
-     * If null is returned, alias was not found.
-     *
-     * @param QueryBuilder $queryBuilder The query builder to retrieve root alias
-     * @return null|string
-     */
-    public static function getRootAlias(QueryBuilder $queryBuilder)
-    {
-        $aliases = $queryBuilder->getRootAliases();
-
-        /*
-         * No aliases?
-         * Nothing to do
-         */
-        if (empty($aliases)) {
-            return null;
-        }
-
-        return Arrays::getFirstElement($aliases);
-    }
-
-    /**
-     * Returns alias of given property joined in given query builder
-     *
-     * If there are no joins or the join does not exist, null is returned.
-     * It's also information if given property is already joined in given query builder.
-     *
-     * @param QueryBuilder $queryBuilder The query builder to verify
-     * @param string       $property     Name of property that maybe is joined
-     * @return null|string
-     */
-    public static function getJoinedPropertyAlias(QueryBuilder $queryBuilder, $property)
-    {
-        $joins = $queryBuilder->getDQLPart('join');
-
-        /*
-         * No joins?
-         * Nothing to do
-         */
-        if (empty($joins)) {
-            return null;
-        }
-
-        $patternTemplate = '/^.+\.%s$/'; // e.g. "SomeThing.PropertyName"
-        $pattern = sprintf($patternTemplate, $property);
-
-        foreach ($joins as $joinExpressions) {
-            /* @var $expression Join */
-            foreach ($joinExpressions as $expression) {
-                $joinedProperty = $expression->getJoin();
-
-                if (preg_match($pattern, $joinedProperty)) {
-                    return $expression->getAlias();
-                }
-            }
-        }
-
-        return null;
-    }
-
-    /**
-     * Sets the WHERE criteria in given query builder
-     *
-     * @param QueryBuilder $queryBuilder The query builder
-     * @param array        $criteria     (optional) The criteria used in WHERE clause. It may simple array with pairs
-     *                                   key-value or an array of arrays where second element of sub-array is the
-     *                                   comparison operator. Example below.
-     * @param string       $alias        (optional) Alias used in the query
-     * @return QueryBuilder
-     *
-     * Example of the $criteria argument:
-     * [
-     *      'created_at' => [
-     *          '2012-11-17 20:00',
-     *          '<'
-     *      ],
-     *      'title' => [
-     *          '%test%',
-     *          'like'
-     *      ],
-     *      'position' => 5,
-     * ]
-     */
-    public static function setCriteria(QueryBuilder $queryBuilder, array $criteria = [], $alias = '')
-    {
-        /*
-         * No criteria used in WHERE clause?
-         * Nothing to do
-         */
-        if (empty($criteria)) {
-            return $queryBuilder;
-        }
-
-        /*
-         * No alias provided?
-         * Let's use root alias
-         */
-        if (empty($alias)) {
-            $alias = self::getRootAlias($queryBuilder);
-        }
-
-        foreach ($criteria as $column => $value) {
-            $compareOperator = '=';
-
-            if (is_array($value) && !empty($value)) {
-                if (2 == count($value)) {
-                    $compareOperator = $value[1];
-                }
-
-                $value = $value[0];
-            }
-
-            $predicate = sprintf('%s.%s %s :%s', $alias, $column, $compareOperator, $column);
-
-            if (null === $value) {
-                $predicate = $queryBuilder->expr()->isNull(sprintf('%s.%s', $alias, $column));
-                unset($criteria[$column]);
-            } else {
-                $queryBuilder->setParameter($column, $value);
-            }
-
-            $queryBuilder = $queryBuilder->andWhere($predicate);
-        }
-
-        return $queryBuilder;
-    }
-
-    /**
-     * Deletes given entities
-     *
-     * @param EntityManager         $entityManager The entity manager
-     * @param array|ArrayCollection $entities      The entities to delete
-     * @param bool                  $flushDeleted  (optional) If is set to true, flushes the deleted objects (default
-     *                                             behaviour). Otherwise - not.
-     * @throws OptimisticLockException
-     * @return bool
-     */
-    public static function deleteEntities(EntityManager $entityManager, $entities, $flushDeleted = true)
-    {
-        /*
-         * No entities provided?
-         * Nothing to do
-         */
-        if (empty($entities)) {
-            return false;
-        }
-
-        foreach ($entities as $entity) {
-            $entityManager->remove($entity);
-        }
-
-        /*
-         * The deleted objects should be flushed?
-         */
-        if ($flushDeleted) {
-            $entityManager->flush();
-        }
-
-        return true;
-    }
-
     /**
      * Adds given parameters to given query builder.
      * Attention. Existing parameters will be overridden.
@@ -218,4 +55,163 @@ class QueryBuilderUtility
 
         return $queryBuilder;
     }
+
+    /**
+     * Deletes given entities
+     *
+     * @param EntityManager         $entityManager The entity manager
+     * @param array|ArrayCollection $entities      The entities to delete
+     * @param bool                  $flushDeleted  (optional) If is set to true, flushes the deleted objects (default
+     *                                             behaviour). Otherwise - not.
+     * @return bool
+     */
+    public static function deleteEntities(EntityManager $entityManager, $entities, $flushDeleted = true)
+    {
+        /*
+         * No entities provided?
+         * Nothing to do
+         */
+        if (empty($entities)) {
+            return false;
+        }
+
+        foreach ($entities as $entity) {
+            $entityManager->remove($entity);
+        }
+
+        // The deleted objects should be flushed?
+        if ($flushDeleted) {
+            $entityManager->flush();
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns alias of given property joined in given query builder
+     *
+     * If there are no joins or the join does not exist, null is returned.
+     * It's also information if given property is already joined in given query builder.
+     *
+     * @param QueryBuilder $queryBuilder The query builder to verify
+     * @param string       $property     Name of property that maybe is joined
+     * @return null|string
+     */
+    public static function getJoinedPropertyAlias(QueryBuilder $queryBuilder, $property)
+    {
+        $joins = $queryBuilder->getDQLPart('join');
+
+        /*
+         * No joins?
+         * Nothing to do
+         */
+        if (empty($joins)) {
+            return null;
+        }
+
+        $patternTemplate = '/^.+\.%s$/'; // e.g. "SomeThing.PropertyName"
+        $pattern = sprintf($patternTemplate, $property);
+
+        foreach ($joins as $joinExpressions) {
+            /** @var Join $expression */
+            foreach ($joinExpressions as $expression) {
+                $joinedProperty = $expression->getJoin();
+
+                if (preg_match($pattern, $joinedProperty)) {
+                    return $expression->getAlias();
+                }
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns root alias of given query builder.
+     * If null is returned, alias was not found.
+     *
+     * @param QueryBuilder $queryBuilder The query builder to retrieve root alias
+     * @return null|string
+     */
+    public static function getRootAlias(QueryBuilder $queryBuilder)
+    {
+        $aliases = $queryBuilder->getRootAliases();
+
+        /*
+         * No aliases?
+         * Nothing to do
+         */
+        if (empty($aliases)) {
+            return null;
+        }
+
+        return Arrays::getFirstElement($aliases);
+    }
+
+    /**
+     * Sets the WHERE criteria in given query builder
+     *
+     * @param QueryBuilder $queryBuilder The query builder
+     * @param array        $criteria     (optional) The criteria used in WHERE clause. It may simple array with pairs
+     *                                   key-value or an array of arrays where second element of sub-array is the
+     *                                   comparison operator. Example below.
+     * @param null|string  $alias        (optional) Alias used in the query
+     * @return QueryBuilder
+     *
+     * Example of the $criteria argument:
+     * [
+     *      'created_at' => [
+     *          '2012-11-17 20:00',
+     *          '<'
+     *      ],
+     *      'title' => [
+     *          '%test%',
+     *          'like'
+     *      ],
+     *      'position' => 5,
+     * ]
+     */
+    public static function setCriteria(QueryBuilder $queryBuilder, array $criteria = [], $alias = null)
+    {
+        /*
+         * No criteria used in WHERE clause?
+         * Nothing to do
+         */
+        if (empty($criteria)) {
+            return $queryBuilder;
+        }
+
+        /*
+         * No alias provided?
+         * Let's use root alias
+         */
+        if (null === $alias || '' === $alias) {
+            $alias = self::getRootAlias($queryBuilder);
+        }
+
+        foreach ($criteria as $column => $value) {
+            $compareOperator = '=';
+
+            if (is_array($value) && !empty($value)) {
+                if (2 === count($value)) {
+                    $compareOperator = $value[1];
+                }
+
+                $value = $value[0];
+            }
+
+            $predicate = sprintf('%s.%s %s :%s', $alias, $column, $compareOperator, $column);
+
+            if (null === $value) {
+                $predicate = $queryBuilder->expr()->isNull(sprintf('%s.%s', $alias, $column));
+                unset($criteria[$column]);
+            } else {
+                $queryBuilder->setParameter($column, $value);
+            }
+
+            $queryBuilder = $queryBuilder->andWhere($predicate);
+        }
+
+        return $queryBuilder;
+    }
 }

src/Utilities/Repository.php

@@ -24,7 +24,87 @@ class Repository
      *
      * @var string
      */
-    const POSITION_KEY = 'position';
+    public const POSITION_KEY = 'position';
+
+    /**
+     * Returns query builder for given entity's repository.
+     * The entity should contain given property, e.g. "name".
+     *
+     * @param EntityRepository $repository Repository of the entity
+     * @param string           $property   (optional) Name of property used by the ORDER BY clause
+     * @param string           $direction  (optional) Direction used by the ORDER BY clause ("ASC" or "DESC")
+     * @return QueryBuilder
+     */
+    public static function getEntityOrderedQueryBuilder(
+        EntityRepository $repository,
+        $property = 'name',
+        $direction = 'ASC'
+    ) {
+        $alias = 'qb';
+        $queryBuilder = $repository->createQueryBuilder($alias);
+
+        if (empty($property)) {
+            return $queryBuilder;
+        }
+
+        return $queryBuilder->orderBy(sprintf('%s.%s', $alias, $property), $direction);
+    }
+
+    /**
+     * Returns extreme position (max or min) of given items
+     *
+     * @param array $items Objects who have "getPosition()" and "setPosition()" methods or arrays
+     * @param bool  $max   (optional) If is set to true, maximum value is returned. Otherwise - minimum.
+     * @return int
+     */
+    public static function getExtremePosition(array $items, $max = true)
+    {
+        /*
+         * No items?
+         * Nothing to do
+         */
+        if (empty($items)) {
+            return null;
+        }
+
+        $extreme = null;
+
+        foreach ($items as $item) {
+            // Not sortable?
+            if (!self::isSortable($item)) {
+                continue;
+            }
+
+            $position = null;
+
+            // Let's grab the position
+            if (is_object($item)) {
+                $position = $item->getPosition();
+            } elseif (array_key_exists(static::POSITION_KEY, $item)) {
+                $position = $item[static::POSITION_KEY];
+            }
+
+            // Maximum value is expected?
+            if ($max) {
+                // Position was found and it's larger than previously found position (the extreme position)?
+                if (null === $extreme || (null !== $position && $position > $extreme)) {
+                    $extreme = $position;
+                }
+
+                continue;
+            }
+
+            /*
+             * Minimum value is expected here.
+             * Position was found and it's smaller than previously found position (the extreme position)?
+             */
+            if (null === $extreme || (null !== $position && $position < $extreme)) {
+                $extreme = $position;
+            }
+        }
+
+        return $extreme;
+    }
 
     /**
      * Replenishes positions of given items
@@ -57,24 +137,17 @@ class Repository
         }
 
         foreach ($items as &$item) {
-            /*
-             * The item is not sortable?
-             */
+            // Not sortable?
             if (!self::isSortable($item)) {
                 continue;
             }
 
-            /*
-             * Position has been set?
-             * Nothing to do
-             */
+            // Sorted already (position has been set)?
             if (self::isSorted($item)) {
                 continue;
             }
 
-            /*
-             * Calculate position
-             */
+            // Calculate position
             if ($asLast) {
                 ++$position;
             } else {
@@ -87,6 +160,7 @@ class Repository
              */
             if (is_object($item)) {
                 $item->setPosition($position);
+
                 continue;
             }
 
@@ -98,91 +172,6 @@ class Repository
         }
     }
 
-    /**
-     * Returns extreme position (max or min) of given items
-     *
-     * @param array $items Objects who have "getPosition()" and "setPosition()" methods or arrays
-     * @param bool  $max   (optional) If is set to true, maximum value is returned. Otherwise - minimum.
-     * @return int
-     */
-    public static function getExtremePosition(array $items, $max = true)
-    {
-        /*
-         * No items?
-         * Nothing to do
-         */
-        if (empty($items)) {
-            return null;
-        }
-
-        $extreme = null;
-
-        foreach ($items as $item) {
-            /*
-             * The item is not sortable?
-             */
-            if (!self::isSortable($item)) {
-                continue;
-            }
-
-            $position = null;
-
-            /*
-             * Let's grab the position
-             */
-            if (is_object($item)) {
-                $position = $item->getPosition();
-            } elseif (array_key_exists(static::POSITION_KEY, $item)) {
-                $position = $item[static::POSITION_KEY];
-            }
-
-            /*
-             * Maximum value is expected?
-             */
-            if ($max) {
-                /*
-                 * Position was found and it's larger than previously found position (the extreme position)?
-                 */
-                if (null === $extreme || (null !== $position && $position > $extreme)) {
-                    $extreme = $position;
-                }
-
-                continue;
-            }
-
-            /*
-             * Minimum value is expected here.
-             * Position was found and it's smaller than previously found position (the extreme position)?
-             */
-            if (null === $extreme || (null !== $position && $position < $extreme)) {
-                $extreme = $position;
-            }
-        }
-
-        return $extreme;
-    }
-
-    /**
-     * Returns query builder for given entity's repository.
-     * The entity should contain given property, e.g. "name".
-     *
-     * @param EntityRepository $repository Repository of the entity
-     * @param string           $property   (optional) Name of property used by the ORDER BY clause
-     * @param string           $direction  (optional) Direction used by the ORDER BY clause ("ASC" or "DESC")
-     * @return QueryBuilder
-     */
-    public static function getEntityOrderedQueryBuilder(
-        EntityRepository $repository,
-        $property = 'name',
-        $direction = 'ASC'
-    ) {
-        $alias = 'qb';
-
-        return $repository
-            ->createQueryBuilder($alias)
-            ->orderBy(sprintf('%s.%s', $alias, $property), $direction);
-    }
-
     /**
      * Returns information if given item is sortable
      *
@@ -215,18 +204,6 @@ class Repository
      */
     private static function isSorted($item)
     {
-        /*
-         * Given item is not sortable?
-         */
-        if (!self::isSortable($item)) {
-            return false;
-        }
-
-        /*
-         * It's an object or it's an array
-         * and position has been set?
-         */
-
         return
             (is_object($item) && null !== $item->getPosition())
             ||

src/Utilities/Uri.php

@@ -9,13 +9,52 @@
 namespace Meritoo\Common\Utilities;
 
 /**
- * Useful uri methods (only static functions)
+ * Useful methods related to uri
  *
  * @author    Meritoo <github@meritoo.pl>
  * @copyright Meritoo <http://www.meritoo.pl>
  */
 class Uri
 {
+    /**
+     * Adds protocol to given url, if the url does not contain given protocol.
+     * Returns the new url.
+     *
+     * @param string $url      Url string
+     * @param string $protocol (optional) Protocol string
+     * @return string
+     */
+    public static function addProtocolToUrl($url, $protocol = 'http')
+    {
+        $pattern = sprintf('/^%s.*/', $protocol);
+
+        if ((bool) preg_match($pattern, $url)) {
+            return $url;
+        }
+
+        return sprintf('%s://%s', $protocol, $url);
+    }
+
+    public static function buildUrl(string $rootUrl, string ...$urlParts): string
+    {
+        $rootUrl = Regex::clearEndingSlash($rootUrl);
+
+        if (empty($urlParts) || Arrays::containsEmptyStringsOnly($urlParts)) {
+            return $rootUrl;
+        }
+
+        array_walk($urlParts, static function (&$part) {
+            $part = Regex::clearBeginningSlash($part);
+            $part = Regex::clearEndingSlash($part);
+        });
+
+        return sprintf(
+            '%s/%s',
+            $rootUrl,
+            implode('/', $urlParts)
+        );
+    }
+
     /**
      * Returns full uri string
      *
@@ -42,7 +81,75 @@ class Uri
             return $requestedUrl;
         }
 
-        return self::getServerNameOrIp(true) . $requestedUrl;
+        return self::getServerNameOrIp(true).$requestedUrl;
+    }
+
+    /**
+     * Returns protocol name
+     *
+     * @return string
+     */
+    public static function getProtocolName()
+    {
+        $matches = [];
+        $protocolData = Miscellaneous::getSafelyGlobalVariable(INPUT_SERVER, 'SERVER_PROTOCOL'); // e.g. HTTP/1.1
+        $matchCount = preg_match('|(.+)\/(.+)|', $protocolData, $matches);
+
+        /*
+         * $matches[1] - protocol name, e.g. HTTP
+         * $matches[2] - protocol version, e.g. 1.1
+         */
+
+        // Oops, cannot match protocol
+        if (0 === $matchCount) {
+            return '';
+        }
+
+        return strtolower($matches[1]);
+    }
+
+    /**
+     * Returns http referer uri
+     *
+     * @return string
+     */
+    public static function getRefererUri()
+    {
+        return Miscellaneous::getSafelyGlobalVariable(INPUT_SERVER, 'HTTP_REFERER');
+    }
+
+    /**
+     * Returns url to resource secured by given htpasswd login and password
+     *
+     * @param string $url      A path / url to some resource, e.g. page, image, css file
+     * @param string $user     (optional) User name used to log in
+     * @param string $password (optional) User password used to log in
+     * @return string
+     */
+    public static function getSecuredUrl($url, $user = '', $password = '')
+    {
+        /*
+         * Url is not provided?
+         * Nothing to do
+         */
+        if (empty($url)) {
+            return '';
+        }
+
+        $protocol = self::getProtocolName();
+        $host = self::getServerNameOrIp();
+
+        if (!Regex::startsWith($url, '/')) {
+            $url = sprintf('/%s', $url);
+        }
+
+        $url = $host.$url;
+
+        if (!empty($user) && !empty($password)) {
+            $url = sprintf('%s:%s@%s', $user, $password, $url);
+        }
+
+        return sprintf('%s://%s', $protocol, $url);
     }
 
     /**
@@ -74,42 +181,6 @@ class Uri
         return $host;
     }
 
-    /**
-     * Returns protocol name
-     *
-     * @return string
-     */
-    public static function getProtocolName()
-    {
-        $matches = [];
-        $protocolData = Miscellaneous::getSafelyGlobalVariable(INPUT_SERVER, 'SERVER_PROTOCOL'); // e.g. HTTP/1.1
-        $matchCount = preg_match('|(.+)\/(.+)|', $protocolData, $matches);
-
-        /*
-         * $matches[1] - protocol name, e.g. HTTP
-         * $matches[2] - protocol version, e.g. 1.1
-         */
-
-        /*
-         * Oops, cannot match protocol
-         */
-        if (0 == $matchCount) {
-            return '';
-        }
-
-        return strtolower($matches[1]);
-    }
-
-    /**
-     * Returns http referer uri
-     *
-     * @return string
-     */
-    public static function getRefererUri()
-    {
-        return Miscellaneous::getSafelyGlobalVariable(INPUT_SERVER, 'HTTP_REFERER');
-    }
-
     /**
      * Returns user's IP address
      *
@@ -121,35 +192,26 @@ class Uri
     }
 
     /**
-     * Returns name and version of user's web browser
+     * Returns name of user's operating system
      *
-     * @param bool $withVersion (optional) If is set to true, version of the browser is returned too. Otherwise -
-     *                          name only.
      * @return string
      */
-    public static function getUserWebBrowserName($withVersion = false)
+    public static function getUserOperatingSystemName()
     {
         $info = self::getUserWebBrowserInfo();
 
-        $knownBrowsers = [
-            'Firefox/([\d\.]+)$' => 'Mozilla Firefox',
-            'OPR/([\d\.]+)$'     => 'Opera',
-            'Chrome/([\d\.]+)$'  => 'Google Chrome',
-            'Safari/([\d\.]+)$'  => 'Apple Safari',
+        $knownSystems = [
+            'Linux' => 'Linux',
+            'Win' => 'Windows',
+            'Mac' => 'Mac OS',
         ];
 
-        foreach ($knownBrowsers as $pattern => $browserName) {
+        foreach ($knownSystems as $pattern => $systemName) {
             $matches = [];
             $matchCount = preg_match(sprintf('|%s|', $pattern), $info, $matches);
 
             if ($matchCount > 0) {
-                if ($withVersion) {
-                    $version = $matches[1];
-
-                    return sprintf('%s %s', $browserName, $version);
-                }
-
-                return $browserName;
+                return $systemName;
             }
         }
 
@@ -183,48 +245,41 @@ class Uri
     }
 
     /**
-     * Returns name of user's operating system
+     * Returns name and version of user's web browser
      *
+     * @param bool $withVersion (optional) If is set to true, version of the browser is returned too. Otherwise -
+     *                          name only.
      * @return string
      */
-    public static function getUserOperatingSystemName()
+    public static function getUserWebBrowserName($withVersion = false)
     {
         $info = self::getUserWebBrowserInfo();
 
-        $knownSystems = [
-            'Linux' => 'Linux',
-            'Win'   => 'Windows',
-            'Mac'   => 'Mac OS',
+        $knownBrowsers = [
+            'Firefox/([\d\.]+)$' => 'Mozilla Firefox',
+            'OPR/([\d\.]+)$' => 'Opera',
+            'Chrome/([\d\.]+)$' => 'Google Chrome',
+            'Safari/([\d\.]+)$' => 'Apple Safari',
         ];
 
-        foreach ($knownSystems as $pattern => $systemName) {
+        foreach ($knownBrowsers as $pattern => $browserName) {
             $matches = [];
             $matchCount = preg_match(sprintf('|%s|', $pattern), $info, $matches);
 
             if ($matchCount > 0) {
-                return $systemName;
+                if ($withVersion) {
+                    $version = $matches[1];
+
+                    return sprintf('%s %s', $browserName, $version);
+                }
+
+                return $browserName;
             }
         }
 
         return '';
     }
 
-    /**
-     * Returns information if running server is localhost
-     *
-     * @return bool
-     */
-    public static function isServerLocalhost()
-    {
-        $serverNameOrIp = strtolower(self::getServerNameOrIp());
-
-        return in_array($serverNameOrIp, [
-            'localhost',
-            '127.0.0.1',
-            '127.0.1.1',
-        ]);
-    }
-
     /**
      * Returns information if given url is external, from another server / domain
      *
@@ -244,9 +299,7 @@ class Uri
         $currentUrl = self::getServerNameOrIp(true);
         $url = self::replenishProtocol($url);
 
-        /*
-         * Let's prepare pattern of current url
-         */
+        // Let's prepare pattern of current url
         $search = [
             ':',
             '/',
@@ -264,6 +317,22 @@ class Uri
         return !Regex::contains($url, $currentUrlPattern);
     }
 
+    /**
+     * Returns information if running server is localhost
+     *
+     * @return bool
+     */
+    public static function isServerLocalhost()
+    {
+        $serverNameOrIp = strtolower(self::getServerNameOrIp());
+
+        return in_array($serverNameOrIp, [
+            'localhost',
+            '127.0.0.1',
+            '127.0.1.1',
+        ]);
+    }
+
     /**
      * Replenishes protocol in the given url
      *
@@ -274,9 +343,7 @@ class Uri
      */
     public static function replenishProtocol($url, $protocol = '')
     {
-        /*
-         * Let's trim the url
-         */
+        // Let's trim the url
         if (is_string($url)) {
             $url = trim($url);
         }
@@ -297,66 +364,11 @@ class Uri
             return $url;
         }
 
-        /*
-         * Protocol is not provided?
-         */
+        // Protocol is not provided?
         if (empty($protocol)) {
             $protocol = self::getProtocolName();
         }
 
         return sprintf('%s://%s', $protocol, $url);
     }
-
-    /**
-     * Returns url to resource secured by given htpasswd login and password
-     *
-     * @param string $url      A path / url to some resource, e.g. page, image, css file
-     * @param string $user     (optional) User name used to log in
-     * @param string $password (optional) User password used to log in
-     * @return string
-     */
-    public static function getSecuredUrl($url, $user = '', $password = '')
-    {
-        /*
-         * Url is not provided?
-         * Nothing to do
-         */
-        if (empty($url)) {
-            return '';
-        }
-
-        $protocol = self::getProtocolName();
-        $host = self::getServerNameOrIp();
-
-        if (!Regex::startsWith($url, '/')) {
-            $url = sprintf('/%s', $url);
-        }
-
-        $url = $host . $url;
-
-        if (!empty($user) && !empty($password)) {
-            $url = sprintf('%s:%s@%s', $user, $password, $url);
-        }
-
-        return sprintf('%s://%s', $protocol, $url);
-    }
-
-    /**
-     * Adds protocol to given url, if the url does not contain given protocol.
-     * Returns the new url.
-     *
-     * @param string $url      Url string
-     * @param string $protocol (optional) Protocol string
-     * @return string
-     */
-    public static function addProtocolToUrl($url, $protocol = 'http')
-    {
-        $pattern = sprintf('/^%s.*/', $protocol);
-
-        if ((bool)preg_match($pattern, $url)) {
-            return $url;
-        }
-
-        return sprintf('%s://%s', $protocol, $url);
-    }
 }

src/Utilities/Xml.php

@@ -40,7 +40,7 @@ class Xml
         $query = $path->query('/*/*');
         $nodesCount = $query->length;
 
-        if (0 == $nodesCount) {
+        if (0 === $nodesCount) {
             return $element1;
         }
 

src/ValueObject/Address.php

@@ -0,0 +1,159 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\ValueObject;
+
+use Meritoo\Common\Utilities\Arrays;
+
+/**
+ * Address
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class Address
+{
+    /**
+     * The street
+     *
+     * @var string
+     */
+    protected $street;
+
+    /**
+     * The number of building
+     *
+     * @var string
+     */
+    protected $buildingNumber;
+
+    /**
+     * The number of flat
+     *
+     * @var string
+     */
+    protected $flatNumber;
+
+    /**
+     * The zip code
+     *
+     * @var string
+     */
+    protected $zipCode;
+
+    /**
+     * The city, location
+     *
+     * @var string
+     */
+    protected $city;
+
+    /**
+     * Class constructor
+     *
+     * @param string $city           City, location
+     * @param string $zipCode        The zip code
+     * @param string $street         The street
+     * @param string $buildingNumber The number of building
+     * @param string $flatNumber     (optional) The number of flat. Default: "".
+     */
+    public function __construct($city, $zipCode, $street, $buildingNumber, $flatNumber = '')
+    {
+        $this->city = $city;
+        $this->zipCode = $zipCode;
+        $this->street = $street;
+        $this->buildingNumber = $buildingNumber;
+        $this->flatNumber = $flatNumber;
+    }
+
+    /**
+     * Returns representation of object as string
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $values = [
+            $this->getFullStreet(),
+            $this->zipCode,
+            $this->city,
+        ];
+
+        return Arrays::getNonEmptyValuesAsString($values);
+    }
+
+    /**
+     * Returns number of building
+     *
+     * @return string
+     */
+    public function getBuildingNumber()
+    {
+        return $this->buildingNumber;
+    }
+
+    /**
+     * Returns city, location
+     *
+     * @return string
+     */
+    public function getCity()
+    {
+        return $this->city;
+    }
+
+    /**
+     * Returns number of flat
+     *
+     * @return string
+     */
+    public function getFlatNumber()
+    {
+        return $this->flatNumber;
+    }
+
+    /**
+     * Returns full street (name + building & flat number)
+     *
+     * @return string
+     */
+    public function getFullStreet()
+    {
+        if (empty($this->street)) {
+            return '';
+        }
+
+        $numbers = $this->buildingNumber;
+
+        if (!empty($numbers) && !empty($this->flatNumber)) {
+            $numbers = sprintf('%s/%s', $numbers, $this->flatNumber);
+        }
+
+        return sprintf('%s %s', $this->street, $numbers);
+    }
+
+    /**
+     * Returns street
+     *
+     * @return string
+     */
+    public function getStreet()
+    {
+        return $this->street;
+    }
+
+    /**
+     * Returns zip code
+     *
+     * @return string
+     */
+    public function getZipCode()
+    {
+        return $this->zipCode;
+    }
+}

src/ValueObject/BankAccount.php

@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\ValueObject;
+
+use Meritoo\Common\Utilities\Arrays;
+
+/**
+ * Bank account
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class BankAccount
+{
+    /**
+     * Name of bank
+     *
+     * @var string
+     */
+    protected $bankName;
+
+    /**
+     * Number of bank's account
+     *
+     * @var string
+     */
+    protected $accountNumber;
+
+    /**
+     * Class constructor
+     *
+     * @param string $bankName      Name of bank
+     * @param string $accountNumber Number of bank's account
+     */
+    public function __construct($bankName, $accountNumber)
+    {
+        $this->bankName = $bankName;
+        $this->accountNumber = $accountNumber;
+    }
+
+    /**
+     * Returns representation of object as string
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $values = [
+            $this->bankName,
+            $this->accountNumber,
+        ];
+
+        return Arrays::getNonEmptyValuesAsString($values);
+    }
+
+    /**
+     * Returns number of bank's account
+     *
+     * @return string
+     */
+    public function getAccountNumber()
+    {
+        return $this->accountNumber;
+    }
+
+    /**
+     * Returns name of bank
+     *
+     * @return string
+     */
+    public function getBankName()
+    {
+        return $this->bankName;
+    }
+}

src/ValueObject/Company.php

@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\ValueObject;
+
+use Meritoo\Common\Utilities\Arrays;
+
+/**
+ * Company
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class Company
+{
+    /**
+     * Name of company
+     *
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * Address of company
+     *
+     * @var Address
+     */
+    protected $address;
+
+    /**
+     * Bank account of company
+     *
+     * @var BankAccount
+     */
+    protected $bankAccount;
+
+    /**
+     * Class constructor
+     *
+     * @param string           $name        Name of company
+     * @param Address          $address     Address of company
+     * @param null|BankAccount $bankAccount (optional) Bank account of company
+     */
+    public function __construct($name, Address $address, BankAccount $bankAccount = null)
+    {
+        $this->name = $name;
+        $this->address = $address;
+        $this->bankAccount = $bankAccount;
+    }
+
+    /**
+     * Returns representation of object as string
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $values = [
+            $this->name,
+            $this->address,
+            $this->bankAccount,
+        ];
+
+        return Arrays::getNonEmptyValuesAsString($values);
+    }
+
+    /**
+     * Returns address of company
+     *
+     * @return Address
+     */
+    public function getAddress()
+    {
+        return $this->address;
+    }
+
+    /**
+     * Returns bank account of company
+     *
+     * @return null|BankAccount
+     */
+    public function getBankAccount()
+    {
+        return $this->bankAccount;
+    }
+
+    /**
+     * Returns name of company
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+}

src/ValueObject/Human.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\ValueObject;
+
+use Meritoo\Common\Traits\ValueObject\HumanTrait;
+
+/**
+ * Human
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class Human
+{
+    use HumanTrait;
+}

src/ValueObject/Size.php

@@ -0,0 +1,245 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\ValueObject;
+
+use Meritoo\Common\Exception\ValueObject\InvalidSizeDimensionsException;
+use Meritoo\Common\Utilities\Regex;
+
+/**
+ * Size, e.g. of image
+ *
+ * Instance of this class may be created using static methods:
+ * - fromString()
+ * - fromArray()
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class Size
+{
+    /**
+     * The width
+     *
+     * @var int
+     */
+    protected $width;
+
+    /**
+     * The height
+     *
+     * @var int
+     */
+    protected $height;
+
+    /**
+     * Unit used when width or height should be returned with unit
+     *
+     * @var string
+     */
+    protected $unit;
+
+    /**
+     * Separator used when converting to string
+     *
+     * @var string
+     */
+    protected $separator = ' x ';
+
+    /**
+     * Class constructor
+     *
+     * @param int    $width  (optional) The width
+     * @param int    $height (optional) The height
+     * @param string $unit   (optional) Unit used when width or height should be returned with unit. Default: "px".
+     *
+     * @throws InvalidSizeDimensionsException
+     */
+    private function __construct($width = null, $height = null, $unit = 'px')
+    {
+        $width = (int) $width;
+        $height = (int) $height;
+
+        if ($width < 0 || $height < 0) {
+            throw new InvalidSizeDimensionsException($width, $height);
+        }
+
+        $this
+            ->setWidth($width)
+            ->setHeight($height)
+        ;
+
+        $this->unit = $unit;
+    }
+
+    /**
+     * Returns string representation of instance of this class in human readable format, e.g. '200 x 100'
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->toString();
+    }
+
+    /**
+     * Creates new instance from given array
+     *
+     * The array should contain 2 elements: width and height.
+     * Examples: ['800', '600'], [800, 600].
+     *
+     * @param array  $array The size represented as array
+     * @param string $unit  (optional) Unit used when width or height should be returned with unit. Default: "px".
+     * @return null|Size
+     */
+    public static function fromArray(array $array, $unit = 'px')
+    {
+        // Requirements for given array:
+        // - indexes "0" and "1"
+        // - should contains exactly 2 elements
+        if (
+            array_key_exists(0, $array)
+            && array_key_exists(1, $array)
+            && 2 === count($array)
+        ) {
+            [$width, $height] = $array;
+
+            return new self($width, $height, $unit);
+        }
+
+        return null;
+    }
+
+    /**
+     * Creates new instance from given string
+     *
+     * @param string $size      The size represented as string (width and height separated by given separator)
+     * @param string $unit      (optional) Unit used when width or height should be returned with unit. Default: "px".
+     * @param string $separator (optional) Separator used to split width and height. Default: " x ".
+     * @return null|Size
+     */
+    public static function fromString($size, $unit = 'px', $separator = ' x ')
+    {
+        if (is_string($size)) {
+            $matches = [];
+            $pattern = Regex::getSizePattern($separator);
+
+            if ((bool) preg_match($pattern, $size, $matches)) {
+                $width = (int) $matches[1];
+                $height = (int) $matches[2];
+                $sizeObject = new self($width, $height, $unit);
+
+                return $sizeObject->setSeparator($separator);
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the height
+     *
+     * @param bool $withUnit (optional) If is set to true, height is returned with unit ("px"). Otherwise - without
+     *                       (default behaviour).
+     * @return int|string
+     */
+    public function getHeight($withUnit = false)
+    {
+        if ($withUnit) {
+            return sprintf('%d %s', $this->height, $this->unit);
+        }
+
+        return $this->height;
+    }
+
+    /**
+     * Sets the height
+     *
+     * @param int $height The height
+     * @return Size
+     */
+    public function setHeight($height)
+    {
+        $this->height = (int) $height;
+
+        return $this;
+    }
+
+    /**
+     * Returns the width
+     *
+     * @param bool $withUnit (optional) If is set to true, width is returned with unit ("px"). Otherwise - without
+     *                       (default behaviour).
+     * @return int|string
+     */
+    public function getWidth($withUnit = false)
+    {
+        if ($withUnit) {
+            return sprintf('%d %s', $this->width, $this->unit);
+        }
+
+        return $this->width;
+    }
+
+    /**
+     * Sets the width
+     *
+     * @param int|string $width The width
+     * @return Size
+     */
+    public function setWidth($width)
+    {
+        $this->width = (int) $width;
+
+        return $this;
+    }
+
+    /**
+     * Sets separator used when converting to string
+     *
+     * @param string $separator The separator
+     * @return Size
+     */
+    public function setSeparator($separator)
+    {
+        $this->separator = $separator;
+
+        return $this;
+    }
+
+    /**
+     * Returns instance of this class as an array.
+     * Values of the array are width and height, eg. [800, 600] or ['800px', '600px'].
+     *
+     * @param bool $withUnits (optional) If is set to true, width and height are returned with unit ("px"). Otherwise
+     *                        - without (default behaviour).
+     * @return array
+     */
+    public function toArray($withUnits = false)
+    {
+        return [
+            $this->getWidth($withUnits),
+            $this->getHeight($withUnits),
+        ];
+    }
+
+    /**
+     * Returns string representation of instance of this class, e.g. '200 x 100' or '200x100'
+     *
+     * @param bool $withUnit (optional) If is set to true, width and height are returned with unit ("px"). Otherwise
+     *                       - without (default behaviour).
+     * @return string
+     */
+    public function toString($withUnit = false)
+    {
+        $width = $this->getWidth($withUnit);
+        $height = $this->getHeight($withUnit);
+
+        return sprintf('%s%s%s', $width, $this->separator, $height);
+    }
+}