* add phpunit as a dev dependency

 * add some basic tests for UrlHelper::rewrite_relative()
 * fix UrlHelper::rewrite_relative() to work better on non-absolute
   relative URL paths

55 files changed, 1936 insertions, 0 deletions

diff --git a/vendor/phar-io/manifest/CHANGELOG.md b/vendor/phar-io/manifest/CHANGELOG.md
new file mode 100644
index 000000000..a403e093c
--- /dev/null
+++ b/vendor/phar-io/manifest/CHANGELOG.md
@@ -0,0 +1,36 @@
+# Changelog
+
+All notable changes to phar-io/manifest are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [2.0.3] - 20.07.2021
+
+- Fixed PHP 7.2 / PHP 7.3 incompatibility introduced in previous release
+
+## [2.0.2] - 20.07.2021
+
+- Fixed PHP 8.1 deprecation notice
+
+## [2.0.1] - 27.06.2020
+
+This release now supports the use of PHP 7.2+ and ^8.0
+
+## [2.0.0] - 10.05.2020
+
+This release now requires PHP 7.2+
+
+### Changed
+
+- Upgraded to phar-io/version 3.0
+    - Version strings `v1.2.3` will now be converted to valid semantic version strings `1.2.3`
+    - Abreviated strings like `1.0` will get expaneded to `1.0.0`  
+
+### Unreleased
+
+[Unreleased]: https://github.com/phar-io/manifest/compare/2.0.3...HEAD
+[2.0.3]: https://github.com/phar-io/manifest/compare/2.0.2...2.0.3
+[2.0.2]: https://github.com/phar-io/manifest/compare/2.0.1...2.0.2
+[2.0.1]: https://github.com/phar-io/manifest/compare/2.0.0...2.0.1
+[2.0.0]: https://github.com/phar-io/manifest/compare/1.0.1...2.0.0
+[1.0.3]: https://github.com/phar-io/manifest/compare/1.0.2...1.0.3
+[1.0.2]: https://github.com/phar-io/manifest/compare/1.0.1...1.0.2
+[1.0.1]: https://github.com/phar-io/manifest/compare/1.0.0...1.0.1
diff --git a/vendor/phar-io/manifest/LICENSE b/vendor/phar-io/manifest/LICENSE
new file mode 100644
index 000000000..64690cf2b
--- /dev/null
+++ b/vendor/phar-io/manifest/LICENSE
@@ -0,0 +1,31 @@
+Phar.io - Manifest
+
+Copyright (c) 2016-2019 Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>, and contributors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of Arne Blankerts nor the names of contributors
+  may be used to endorse or promote products derived from this software
+  without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT  * NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
diff --git a/vendor/phar-io/manifest/README.md b/vendor/phar-io/manifest/README.md
new file mode 100644
index 000000000..e6d0b055d
--- /dev/null
+++ b/vendor/phar-io/manifest/README.md
@@ -0,0 +1,30 @@
+# Manifest
+
+Component for reading [phar.io](https://phar.io/) manifest information from a [PHP Archive (PHAR)](http://php.net/phar).
+
+[![Build Status](https://travis-ci.org/phar-io/manifest.svg?branch=master)](https://travis-ci.org/phar-io/manifest)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/phar-io/manifest/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/phar-io/manifest/?branch=master)
+[![SensioLabsInsight](https://insight.sensiolabs.com/projects/d8cc6035-69ad-477d-bd1a-ccc605480fd7/mini.png)](https://insight.sensiolabs.com/projects/d8cc6035-69ad-477d-bd1a-ccc605480fd7)
+
+## Installation
+
+You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
+
+    composer require phar-io/manifest
+
+If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
+
+    composer require --dev phar-io/manifest
+
+## Usage
+
+```php
+use PharIo\Manifest\ManifestLoader;
+use PharIo\Manifest\ManifestSerializer;
+
+$manifest = ManifestLoader::fromFile('manifest.xml');
+
+var_dump($manifest);
+
+echo (new ManifestSerializer)->serializeToString($manifest);
+```
diff --git a/vendor/phar-io/manifest/composer.json b/vendor/phar-io/manifest/composer.json
new file mode 100644
index 000000000..a2521193a
--- /dev/null
+++ b/vendor/phar-io/manifest/composer.json
@@ -0,0 +1,42 @@
+{
+  "name": "phar-io/manifest",
+  "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+  "license": "BSD-3-Clause",
+  "authors": [
+    {
+      "name": "Arne Blankerts",
+      "email": "[email protected]",
+      "role": "Developer"
+    },
+    {
+      "name": "Sebastian Heuer",
+      "email": "[email protected]",
+      "role": "Developer"
+    },
+    {
+      "name": "Sebastian Bergmann",
+      "email": "[email protected]",
+      "role": "Developer"
+    }
+  ],
+  "support": {
+    "issues": "https://github.com/phar-io/manifest/issues"
+  },
+  "require": {
+    "php": "^7.2 || ^8.0",
+    "ext-dom": "*",
+    "ext-phar": "*",
+    "ext-xmlwriter": "*",
+    "phar-io/version": "^3.0.1"
+  },
+  "autoload": {
+    "classmap": [
+      "src/"
+    ]
+  },
+  "extra": {
+    "branch-alias": {
+        "dev-master": "2.0.x-dev"
+    }
+  }
+}
diff --git a/vendor/phar-io/manifest/composer.lock b/vendor/phar-io/manifest/composer.lock
new file mode 100644
index 000000000..e0e6db76a
--- /dev/null
+++ b/vendor/phar-io/manifest/composer.lock
@@ -0,0 +1,70 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "f2ac4614ce4f7273fd54a64b65fd047a",
+    "packages": [
+        {
+            "name": "phar-io/version",
+            "version": "3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "d06a5000ac1a258a7d035295f0bd4ae7c859bc4f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/d06a5000ac1a258a7d035295f0bd4ae7c859bc4f",
+                "reference": "d06a5000ac1a258a7d035295f0bd4ae7c859bc4f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "[email protected]",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "[email protected]",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "[email protected]",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "time": "2020-05-09T21:27:55+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "^7.2",
+        "ext-dom": "*",
+        "ext-phar": "*",
+        "ext-xmlwriter": "*"
+    },
+    "platform-dev": []
+}
diff --git a/vendor/phar-io/manifest/src/ManifestDocumentMapper.php b/vendor/phar-io/manifest/src/ManifestDocumentMapper.php
new file mode 100644
index 000000000..8e539d5f1
--- /dev/null
+++ b/vendor/phar-io/manifest/src/ManifestDocumentMapper.php
@@ -0,0 +1,150 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\Exception as VersionException;
+use PharIo\Version\Version;
+use PharIo\Version\VersionConstraintParser;
+
+class ManifestDocumentMapper {
+    public function map(ManifestDocument $document): Manifest {
+        try {
+            $contains          = $document->getContainsElement();
+            $type              = $this->mapType($contains);
+            $copyright         = $this->mapCopyright($document->getCopyrightElement());
+            $requirements      = $this->mapRequirements($document->getRequiresElement());
+            $bundledComponents = $this->mapBundledComponents($document);
+
+            return new Manifest(
+                new ApplicationName($contains->getName()),
+                new Version($contains->getVersion()),
+                $type,
+                $copyright,
+                $requirements,
+                $bundledComponents
+            );
+        } catch (VersionException $e) {
+            throw new ManifestDocumentMapperException($e->getMessage(), (int)$e->getCode(), $e);
+        } catch (Exception $e) {
+            throw new ManifestDocumentMapperException($e->getMessage(), (int)$e->getCode(), $e);
+        }
+    }
+
+    private function mapType(ContainsElement $contains): Type {
+        switch ($contains->getType()) {
+            case 'application':
+                return Type::application();
+            case 'library':
+                return Type::library();
+            case 'extension':
+                return $this->mapExtension($contains->getExtensionElement());
+        }
+
+        throw new ManifestDocumentMapperException(
+            \sprintf('Unsupported type %s', $contains->getType())
+        );
+    }
+
+    private function mapCopyright(CopyrightElement $copyright): CopyrightInformation {
+        $authors = new AuthorCollection();
+
+        foreach ($copyright->getAuthorElements() as $authorElement) {
+            $authors->add(
+                new Author(
+                    $authorElement->getName(),
+                    new Email($authorElement->getEmail())
+                )
+            );
+        }
+
+        $licenseElement = $copyright->getLicenseElement();
+        $license        = new License(
+            $licenseElement->getType(),
+            new Url($licenseElement->getUrl())
+        );
+
+        return new CopyrightInformation(
+            $authors,
+            $license
+        );
+    }
+
+    private function mapRequirements(RequiresElement $requires): RequirementCollection {
+        $collection = new RequirementCollection();
+        $phpElement = $requires->getPHPElement();
+        $parser     = new VersionConstraintParser;
+
+        try {
+            $versionConstraint = $parser->parse($phpElement->getVersion());
+        } catch (VersionException $e) {
+            throw new ManifestDocumentMapperException(
+                \sprintf('Unsupported version constraint - %s', $e->getMessage()),
+                (int)$e->getCode(),
+                $e
+            );
+        }
+
+        $collection->add(
+            new PhpVersionRequirement(
+                $versionConstraint
+            )
+        );
+
+        if (!$phpElement->hasExtElements()) {
+            return $collection;
+        }
+
+        foreach ($phpElement->getExtElements() as $extElement) {
+            $collection->add(
+                new PhpExtensionRequirement($extElement->getName())
+            );
+        }
+
+        return $collection;
+    }
+
+    private function mapBundledComponents(ManifestDocument $document): BundledComponentCollection {
+        $collection = new BundledComponentCollection();
+
+        if (!$document->hasBundlesElement()) {
+            return $collection;
+        }
+
+        foreach ($document->getBundlesElement()->getComponentElements() as $componentElement) {
+            $collection->add(
+                new BundledComponent(
+                    $componentElement->getName(),
+                    new Version(
+                        $componentElement->getVersion()
+                    )
+                )
+            );
+        }
+
+        return $collection;
+    }
+
+    private function mapExtension(ExtensionElement $extension): Extension {
+        try {
+            $versionConstraint = (new VersionConstraintParser)->parse($extension->getCompatible());
+
+            return Type::extension(
+                new ApplicationName($extension->getFor()),
+                $versionConstraint
+            );
+        } catch (VersionException $e) {
+            throw new ManifestDocumentMapperException(
+                \sprintf('Unsupported version constraint - %s', $e->getMessage()),
+                (int)$e->getCode(),
+                $e
+            );
+        }
+    }
+}
diff --git a/vendor/phar-io/manifest/src/ManifestLoader.php b/vendor/phar-io/manifest/src/ManifestLoader.php
new file mode 100644
index 000000000..ae884e49a
--- /dev/null
+++ b/vendor/phar-io/manifest/src/ManifestLoader.php
@@ -0,0 +1,44 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ManifestLoader {
+    public static function fromFile(string $filename): Manifest {
+        try {
+            return (new ManifestDocumentMapper())->map(
+                ManifestDocument::fromFile($filename)
+            );
+        } catch (Exception $e) {
+            throw new ManifestLoaderException(
+                \sprintf('Loading %s failed.', $filename),
+                (int)$e->getCode(),
+                $e
+            );
+        }
+    }
+
+    public static function fromPhar(string $filename): Manifest {
+        return self::fromFile('phar://' . $filename . '/manifest.xml');
+    }
+
+    public static function fromString(string $manifest): Manifest {
+        try {
+            return (new ManifestDocumentMapper())->map(
+                ManifestDocument::fromString($manifest)
+            );
+        } catch (Exception $e) {
+            throw new ManifestLoaderException(
+                'Processing string failed',
+                (int)$e->getCode(),
+                $e
+            );
+        }
+    }
+}
diff --git a/vendor/phar-io/manifest/src/ManifestSerializer.php b/vendor/phar-io/manifest/src/ManifestSerializer.php
new file mode 100644
index 000000000..e236b5984
--- /dev/null
+++ b/vendor/phar-io/manifest/src/ManifestSerializer.php
@@ -0,0 +1,168 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\AnyVersionConstraint;
+use PharIo\Version\Version;
+use PharIo\Version\VersionConstraint;
+use XMLWriter;
+
+/** @psalm-suppress MissingConstructor */
+class ManifestSerializer {
+    /** @var XMLWriter */
+    private $xmlWriter;
+
+    public function serializeToFile(Manifest $manifest, string $filename): void {
+        \file_put_contents(
+            $filename,
+            $this->serializeToString($manifest)
+        );
+    }
+
+    public function serializeToString(Manifest $manifest): string {
+        $this->startDocument();
+
+        $this->addContains($manifest->getName(), $manifest->getVersion(), $manifest->getType());
+        $this->addCopyright($manifest->getCopyrightInformation());
+        $this->addRequirements($manifest->getRequirements());
+        $this->addBundles($manifest->getBundledComponents());
+
+        return $this->finishDocument();
+    }
+
+    private function startDocument(): void {
+        $xmlWriter = new XMLWriter();
+        $xmlWriter->openMemory();
+        $xmlWriter->setIndent(true);
+        $xmlWriter->setIndentString(\str_repeat(' ', 4));
+        $xmlWriter->startDocument('1.0', 'UTF-8');
+        $xmlWriter->startElement('phar');
+        $xmlWriter->writeAttribute('xmlns', 'https://phar.io/xml/manifest/1.0');
+
+        $this->xmlWriter = $xmlWriter;
+    }
+
+    private function finishDocument(): string {
+        $this->xmlWriter->endElement();
+        $this->xmlWriter->endDocument();
+
+        return $this->xmlWriter->outputMemory();
+    }
+
+    private function addContains(ApplicationName $name, Version $version, Type $type): void {
+        $this->xmlWriter->startElement('contains');
+        $this->xmlWriter->writeAttribute('name', $name->asString());
+        $this->xmlWriter->writeAttribute('version', $version->getVersionString());
+
+        switch (true) {
+            case $type->isApplication(): {
+                $this->xmlWriter->writeAttribute('type', 'application');
+
+                break;
+            }
+
+            case $type->isLibrary(): {
+                $this->xmlWriter->writeAttribute('type', 'library');
+
+                break;
+            }
+
+            case $type->isExtension(): {
+                $this->xmlWriter->writeAttribute('type', 'extension');
+                /* @var $type Extension */
+                $this->addExtension(
+                    $type->getApplicationName(),
+                    $type->getVersionConstraint()
+                );
+
+                break;
+            }
+
+            default: {
+                $this->xmlWriter->writeAttribute('type', 'custom');
+            }
+        }
+
+        $this->xmlWriter->endElement();
+    }
+
+    private function addCopyright(CopyrightInformation $copyrightInformation): void {
+        $this->xmlWriter->startElement('copyright');
+
+        foreach ($copyrightInformation->getAuthors() as $author) {
+            $this->xmlWriter->startElement('author');
+            $this->xmlWriter->writeAttribute('name', $author->getName());
+            $this->xmlWriter->writeAttribute('email', $author->getEmail()->asString());
+            $this->xmlWriter->endElement();
+        }
+
+        $license = $copyrightInformation->getLicense();
+
+        $this->xmlWriter->startElement('license');
+        $this->xmlWriter->writeAttribute('type', $license->getName());
+        $this->xmlWriter->writeAttribute('url', $license->getUrl()->asString());
+        $this->xmlWriter->endElement();
+
+        $this->xmlWriter->endElement();
+    }
+
+    private function addRequirements(RequirementCollection $requirementCollection): void {
+        $phpRequirement = new AnyVersionConstraint();
+        $extensions     = [];
+
+        foreach ($requirementCollection as $requirement) {
+            if ($requirement instanceof PhpVersionRequirement) {
+                $phpRequirement = $requirement->getVersionConstraint();
+
+                continue;
+            }
+
+            if ($requirement instanceof PhpExtensionRequirement) {
+                $extensions[] = $requirement->asString();
+            }
+        }
+
+        $this->xmlWriter->startElement('requires');
+        $this->xmlWriter->startElement('php');
+        $this->xmlWriter->writeAttribute('version', $phpRequirement->asString());
+
+        foreach ($extensions as $extension) {
+            $this->xmlWriter->startElement('ext');
+            $this->xmlWriter->writeAttribute('name', $extension);
+            $this->xmlWriter->endElement();
+        }
+
+        $this->xmlWriter->endElement();
+        $this->xmlWriter->endElement();
+    }
+
+    private function addBundles(BundledComponentCollection $bundledComponentCollection): void {
+        if (\count($bundledComponentCollection) === 0) {
+            return;
+        }
+        $this->xmlWriter->startElement('bundles');
+
+        foreach ($bundledComponentCollection as $bundledComponent) {
+            $this->xmlWriter->startElement('component');
+            $this->xmlWriter->writeAttribute('name', $bundledComponent->getName());
+            $this->xmlWriter->writeAttribute('version', $bundledComponent->getVersion()->getVersionString());
+            $this->xmlWriter->endElement();
+        }
+
+        $this->xmlWriter->endElement();
+    }
+
+    private function addExtension(ApplicationName $applicationName, VersionConstraint $versionConstraint): void {
+        $this->xmlWriter->startElement('extension');
+        $this->xmlWriter->writeAttribute('for', $applicationName->asString());
+        $this->xmlWriter->writeAttribute('compatible', $versionConstraint->asString());
+        $this->xmlWriter->endElement();
+    }
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/ElementCollectionException.php b/vendor/phar-io/manifest/src/exceptions/ElementCollectionException.php
new file mode 100644
index 000000000..766fc0e6a
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/ElementCollectionException.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ElementCollectionException extends \InvalidArgumentException implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/Exception.php b/vendor/phar-io/manifest/src/exceptions/Exception.php
new file mode 100644
index 000000000..e7f122097
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/Exception.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+interface Exception extends \Throwable {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/InvalidApplicationNameException.php b/vendor/phar-io/manifest/src/exceptions/InvalidApplicationNameException.php
new file mode 100644
index 000000000..952901eb5
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/InvalidApplicationNameException.php
@@ -0,0 +1,14 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class InvalidApplicationNameException extends \InvalidArgumentException implements Exception {
+    public const InvalidFormat = 2;
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/InvalidEmailException.php b/vendor/phar-io/manifest/src/exceptions/InvalidEmailException.php
new file mode 100644
index 000000000..3cbe08223
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/InvalidEmailException.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class InvalidEmailException extends \InvalidArgumentException implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/InvalidUrlException.php b/vendor/phar-io/manifest/src/exceptions/InvalidUrlException.php
new file mode 100644
index 000000000..8f77e2946
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/InvalidUrlException.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class InvalidUrlException extends \InvalidArgumentException implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/ManifestDocumentException.php b/vendor/phar-io/manifest/src/exceptions/ManifestDocumentException.php
new file mode 100644
index 000000000..cf1c314c6
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/ManifestDocumentException.php
@@ -0,0 +1,5 @@
+<?php declare(strict_types = 1);
+namespace PharIo\Manifest;
+
+class ManifestDocumentException extends \RuntimeException implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/ManifestDocumentLoadingException.php b/vendor/phar-io/manifest/src/exceptions/ManifestDocumentLoadingException.php
new file mode 100644
index 000000000..4676e3546
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/ManifestDocumentLoadingException.php
@@ -0,0 +1,45 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use LibXMLError;
+
+class ManifestDocumentLoadingException extends \Exception implements Exception {
+    /** @var LibXMLError[] */
+    private $libxmlErrors;
+
+    /**
+     * ManifestDocumentLoadingException constructor.
+     *
+     * @param LibXMLError[] $libxmlErrors
+     */
+    public function __construct(array $libxmlErrors) {
+        $this->libxmlErrors = $libxmlErrors;
+        $first              = $this->libxmlErrors[0];
+
+        parent::__construct(
+            \sprintf(
+                '%s (Line: %d / Column: %d / File: %s)',
+                $first->message,
+                $first->line,
+                $first->column,
+                $first->file
+            ),
+            $first->code
+        );
+    }
+
+    /**
+     * @return LibXMLError[]
+     */
+    public function getLibxmlErrors(): array {
+        return $this->libxmlErrors;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/ManifestDocumentMapperException.php b/vendor/phar-io/manifest/src/exceptions/ManifestDocumentMapperException.php
new file mode 100644
index 000000000..43373bd34
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/ManifestDocumentMapperException.php
@@ -0,0 +1,5 @@
+<?php declare(strict_types = 1);
+namespace PharIo\Manifest;
+
+class ManifestDocumentMapperException extends \RuntimeException implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/ManifestElementException.php b/vendor/phar-io/manifest/src/exceptions/ManifestElementException.php
new file mode 100644
index 000000000..a4e772369
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/ManifestElementException.php
@@ -0,0 +1,5 @@
+<?php declare(strict_types = 1);
+namespace PharIo\Manifest;
+
+class ManifestElementException extends \RuntimeException implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/exceptions/ManifestLoaderException.php b/vendor/phar-io/manifest/src/exceptions/ManifestLoaderException.php
new file mode 100644
index 000000000..df0971edc
--- /dev/null
+++ b/vendor/phar-io/manifest/src/exceptions/ManifestLoaderException.php
@@ -0,0 +1,5 @@
+<?php declare(strict_types = 1);
+namespace PharIo\Manifest;
+
+class ManifestLoaderException extends \Exception implements Exception {
+}
diff --git a/vendor/phar-io/manifest/src/values/Application.php b/vendor/phar-io/manifest/src/values/Application.php
new file mode 100644
index 000000000..5420bcb8f
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Application.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class Application extends Type {
+    public function isApplication(): bool {
+        return true;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/ApplicationName.php b/vendor/phar-io/manifest/src/values/ApplicationName.php
new file mode 100644
index 000000000..d71744ab6
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/ApplicationName.php
@@ -0,0 +1,37 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ApplicationName {
+    /** @var string */
+    private $name;
+
+    public function __construct(string $name) {
+        $this->ensureValidFormat($name);
+        $this->name = $name;
+    }
+
+    public function asString(): string {
+        return $this->name;
+    }
+
+    public function isEqual(ApplicationName $name): bool {
+        return $this->name === $name->name;
+    }
+
+    private function ensureValidFormat(string $name): void {
+        if (!\preg_match('#\w/\w#', $name)) {
+            throw new InvalidApplicationNameException(
+                \sprintf('Format of name "%s" is not valid - expected: vendor/packagename', $name),
+                InvalidApplicationNameException::InvalidFormat
+            );
+        }
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Author.php b/vendor/phar-io/manifest/src/values/Author.php
new file mode 100644
index 000000000..82b666e7d
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Author.php
@@ -0,0 +1,39 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class Author {
+    /** @var string */
+    private $name;
+
+    /** @var Email */
+    private $email;
+
+    public function __construct(string $name, Email $email) {
+        $this->name  = $name;
+        $this->email = $email;
+    }
+
+    public function asString(): string {
+        return \sprintf(
+            '%s <%s>',
+            $this->name,
+            $this->email->asString()
+        );
+    }
+
+    public function getName(): string {
+        return $this->name;
+    }
+
+    public function getEmail(): Email {
+        return $this->email;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/AuthorCollection.php b/vendor/phar-io/manifest/src/values/AuthorCollection.php
new file mode 100644
index 000000000..27e50ad84
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/AuthorCollection.php
@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class AuthorCollection implements \Countable, \IteratorAggregate {
+    /** @var Author[] */
+    private $authors = [];
+
+    public function add(Author $author): void {
+        $this->authors[] = $author;
+    }
+
+    /**
+     * @return Author[]
+     */
+    public function getAuthors(): array {
+        return $this->authors;
+    }
+
+    public function count(): int {
+        return \count($this->authors);
+    }
+
+    public function getIterator(): AuthorCollectionIterator {
+        return new AuthorCollectionIterator($this);
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/AuthorCollectionIterator.php b/vendor/phar-io/manifest/src/values/AuthorCollectionIterator.php
new file mode 100644
index 000000000..4ff3c3943
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/AuthorCollectionIterator.php
@@ -0,0 +1,42 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class AuthorCollectionIterator implements \Iterator {
+    /** @var Author[] */
+    private $authors;
+
+    /** @var int */
+    private $position = 0;
+
+    public function __construct(AuthorCollection $authors) {
+        $this->authors = $authors->getAuthors();
+    }
+
+    public function rewind(): void {
+        $this->position = 0;
+    }
+
+    public function valid(): bool {
+        return $this->position < \count($this->authors);
+    }
+
+    public function key(): int {
+        return $this->position;
+    }
+
+    public function current(): Author {
+        return $this->authors[$this->position];
+    }
+
+    public function next(): void {
+        $this->position++;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/BundledComponent.php b/vendor/phar-io/manifest/src/values/BundledComponent.php
new file mode 100644
index 000000000..ea77b4402
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/BundledComponent.php
@@ -0,0 +1,33 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\Version;
+
+class BundledComponent {
+    /** @var string */
+    private $name;
+
+    /** @var Version */
+    private $version;
+
+    public function __construct(string $name, Version $version) {
+        $this->name    = $name;
+        $this->version = $version;
+    }
+
+    public function getName(): string {
+        return $this->name;
+    }
+
+    public function getVersion(): Version {
+        return $this->version;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/BundledComponentCollection.php b/vendor/phar-io/manifest/src/values/BundledComponentCollection.php
new file mode 100644
index 000000000..b628eaa35
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/BundledComponentCollection.php
@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class BundledComponentCollection implements \Countable, \IteratorAggregate {
+    /** @var BundledComponent[] */
+    private $bundledComponents = [];
+
+    public function add(BundledComponent $bundledComponent): void {
+        $this->bundledComponents[] = $bundledComponent;
+    }
+
+    /**
+     * @return BundledComponent[]
+     */
+    public function getBundledComponents(): array {
+        return $this->bundledComponents;
+    }
+
+    public function count(): int {
+        return \count($this->bundledComponents);
+    }
+
+    public function getIterator(): BundledComponentCollectionIterator {
+        return new BundledComponentCollectionIterator($this);
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/BundledComponentCollectionIterator.php b/vendor/phar-io/manifest/src/values/BundledComponentCollectionIterator.php
new file mode 100644
index 000000000..462db45a1
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/BundledComponentCollectionIterator.php
@@ -0,0 +1,42 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class BundledComponentCollectionIterator implements \Iterator {
+    /** @var BundledComponent[] */
+    private $bundledComponents;
+
+    /** @var int */
+    private $position = 0;
+
+    public function __construct(BundledComponentCollection $bundledComponents) {
+        $this->bundledComponents = $bundledComponents->getBundledComponents();
+    }
+
+    public function rewind(): void {
+        $this->position = 0;
+    }
+
+    public function valid(): bool {
+        return $this->position < \count($this->bundledComponents);
+    }
+
+    public function key(): int {
+        return $this->position;
+    }
+
+    public function current(): BundledComponent {
+        return $this->bundledComponents[$this->position];
+    }
+
+    public function next(): void {
+        $this->position++;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/CopyrightInformation.php b/vendor/phar-io/manifest/src/values/CopyrightInformation.php
new file mode 100644
index 000000000..d26f94721
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/CopyrightInformation.php
@@ -0,0 +1,31 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class CopyrightInformation {
+    /** @var AuthorCollection */
+    private $authors;
+
+    /** @var License */
+    private $license;
+
+    public function __construct(AuthorCollection $authors, License $license) {
+        $this->authors = $authors;
+        $this->license = $license;
+    }
+
+    public function getAuthors(): AuthorCollection {
+        return $this->authors;
+    }
+
+    public function getLicense(): License {
+        return $this->license;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Email.php b/vendor/phar-io/manifest/src/values/Email.php
new file mode 100644
index 000000000..588348d89
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Email.php
@@ -0,0 +1,31 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class Email {
+    /** @var string */
+    private $email;
+
+    public function __construct(string $email) {
+        $this->ensureEmailIsValid($email);
+
+        $this->email = $email;
+    }
+
+    public function asString(): string {
+        return $this->email;
+    }
+
+    private function ensureEmailIsValid(string $url): void {
+        if (\filter_var($url, \FILTER_VALIDATE_EMAIL) === false) {
+            throw new InvalidEmailException;
+        }
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Extension.php b/vendor/phar-io/manifest/src/values/Extension.php
new file mode 100644
index 000000000..4c5726f8a
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Extension.php
@@ -0,0 +1,46 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\Version;
+use PharIo\Version\VersionConstraint;
+
+class Extension extends Type {
+    /** @var ApplicationName */
+    private $application;
+
+    /** @var VersionConstraint */
+    private $versionConstraint;
+
+    public function __construct(ApplicationName $application, VersionConstraint $versionConstraint) {
+        $this->application       = $application;
+        $this->versionConstraint = $versionConstraint;
+    }
+
+    public function getApplicationName(): ApplicationName {
+        return $this->application;
+    }
+
+    public function getVersionConstraint(): VersionConstraint {
+        return $this->versionConstraint;
+    }
+
+    public function isExtension(): bool {
+        return true;
+    }
+
+    public function isExtensionFor(ApplicationName $name): bool {
+        return $this->application->isEqual($name);
+    }
+
+    public function isCompatibleWith(ApplicationName $name, Version $version): bool {
+        return $this->isExtensionFor($name) && $this->versionConstraint->complies($version);
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Library.php b/vendor/phar-io/manifest/src/values/Library.php
new file mode 100644
index 000000000..21849e137
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Library.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class Library extends Type {
+    public function isLibrary(): bool {
+        return true;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/License.php b/vendor/phar-io/manifest/src/values/License.php
new file mode 100644
index 000000000..39542fe87
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/License.php
@@ -0,0 +1,31 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class License {
+    /** @var string */
+    private $name;
+
+    /** @var Url */
+    private $url;
+
+    public function __construct(string $name, Url $url) {
+        $this->name = $name;
+        $this->url  = $url;
+    }
+
+    public function getName(): string {
+        return $this->name;
+    }
+
+    public function getUrl(): Url {
+        return $this->url;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Manifest.php b/vendor/phar-io/manifest/src/values/Manifest.php
new file mode 100644
index 000000000..0140b842b
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Manifest.php
@@ -0,0 +1,92 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\Version;
+
+class Manifest {
+    /** @var ApplicationName */
+    private $name;
+
+    /** @var Version */
+    private $version;
+
+    /** @var Type */
+    private $type;
+
+    /** @var CopyrightInformation */
+    private $copyrightInformation;
+
+    /** @var RequirementCollection */
+    private $requirements;
+
+    /** @var BundledComponentCollection */
+    private $bundledComponents;
+
+    public function __construct(ApplicationName $name, Version $version, Type $type, CopyrightInformation $copyrightInformation, RequirementCollection $requirements, BundledComponentCollection $bundledComponents) {
+        $this->name                 = $name;
+        $this->version              = $version;
+        $this->type                 = $type;
+        $this->copyrightInformation = $copyrightInformation;
+        $this->requirements         = $requirements;
+        $this->bundledComponents    = $bundledComponents;
+    }
+
+    public function getName(): ApplicationName {
+        return $this->name;
+    }
+
+    public function getVersion(): Version {
+        return $this->version;
+    }
+
+    public function getType(): Type {
+        return $this->type;
+    }
+
+    public function getCopyrightInformation(): CopyrightInformation {
+        return $this->copyrightInformation;
+    }
+
+    public function getRequirements(): RequirementCollection {
+        return $this->requirements;
+    }
+
+    public function getBundledComponents(): BundledComponentCollection {
+        return $this->bundledComponents;
+    }
+
+    public function isApplication(): bool {
+        return $this->type->isApplication();
+    }
+
+    public function isLibrary(): bool {
+        return $this->type->isLibrary();
+    }
+
+    public function isExtension(): bool {
+        return $this->type->isExtension();
+    }
+
+    public function isExtensionFor(ApplicationName $application, Version $version = null): bool {
+        if (!$this->isExtension()) {
+            return false;
+        }
+
+        /** @var Extension $type */
+        $type = $this->type;
+
+        if ($version !== null) {
+            return $type->isCompatibleWith($application, $version);
+        }
+
+        return $type->isExtensionFor($application);
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/PhpExtensionRequirement.php b/vendor/phar-io/manifest/src/values/PhpExtensionRequirement.php
new file mode 100644
index 000000000..088f38584
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/PhpExtensionRequirement.php
@@ -0,0 +1,23 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class PhpExtensionRequirement implements Requirement {
+    /** @var string */
+    private $extension;
+
+    public function __construct(string $extension) {
+        $this->extension = $extension;
+    }
+
+    public function asString(): string {
+        return $this->extension;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/PhpVersionRequirement.php b/vendor/phar-io/manifest/src/values/PhpVersionRequirement.php
new file mode 100644
index 000000000..f8d6f6d13
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/PhpVersionRequirement.php
@@ -0,0 +1,25 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\VersionConstraint;
+
+class PhpVersionRequirement implements Requirement {
+    /** @var VersionConstraint */
+    private $versionConstraint;
+
+    public function __construct(VersionConstraint $versionConstraint) {
+        $this->versionConstraint = $versionConstraint;
+    }
+
+    public function getVersionConstraint(): VersionConstraint {
+        return $this->versionConstraint;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Requirement.php b/vendor/phar-io/manifest/src/values/Requirement.php
new file mode 100644
index 000000000..8b845d6a0
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Requirement.php
@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+interface Requirement {
+}
diff --git a/vendor/phar-io/manifest/src/values/RequirementCollection.php b/vendor/phar-io/manifest/src/values/RequirementCollection.php
new file mode 100644
index 000000000..b82cd955e
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/RequirementCollection.php
@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class RequirementCollection implements \Countable, \IteratorAggregate {
+    /** @var Requirement[] */
+    private $requirements = [];
+
+    public function add(Requirement $requirement): void {
+        $this->requirements[] = $requirement;
+    }
+
+    /**
+     * @return Requirement[]
+     */
+    public function getRequirements(): array {
+        return $this->requirements;
+    }
+
+    public function count(): int {
+        return \count($this->requirements);
+    }
+
+    public function getIterator(): RequirementCollectionIterator {
+        return new RequirementCollectionIterator($this);
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/RequirementCollectionIterator.php b/vendor/phar-io/manifest/src/values/RequirementCollectionIterator.php
new file mode 100644
index 000000000..5614eaf7f
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/RequirementCollectionIterator.php
@@ -0,0 +1,42 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class RequirementCollectionIterator implements \Iterator {
+    /** @var Requirement[] */
+    private $requirements;
+
+    /** @var int */
+    private $position = 0;
+
+    public function __construct(RequirementCollection $requirements) {
+        $this->requirements = $requirements->getRequirements();
+    }
+
+    public function rewind(): void {
+        $this->position = 0;
+    }
+
+    public function valid(): bool {
+        return $this->position < \count($this->requirements);
+    }
+
+    public function key(): int {
+        return $this->position;
+    }
+
+    public function current(): Requirement {
+        return $this->requirements[$this->position];
+    }
+
+    public function next(): void {
+        $this->position++;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Type.php b/vendor/phar-io/manifest/src/values/Type.php
new file mode 100644
index 000000000..23b289805
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Type.php
@@ -0,0 +1,41 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use PharIo\Version\VersionConstraint;
+
+abstract class Type {
+    public static function application(): Application {
+        return new Application;
+    }
+
+    public static function library(): Library {
+        return new Library;
+    }
+
+    public static function extension(ApplicationName $application, VersionConstraint $versionConstraint): Extension {
+        return new Extension($application, $versionConstraint);
+    }
+
+    /** @psalm-assert-if-true Application $this */
+    public function isApplication(): bool {
+        return false;
+    }
+
+    /** @psalm-assert-if-true Library $this */
+    public function isLibrary(): bool {
+        return false;
+    }
+
+    /** @psalm-assert-if-true Extension $this */
+    public function isExtension(): bool {
+        return false;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/values/Url.php b/vendor/phar-io/manifest/src/values/Url.php
new file mode 100644
index 000000000..639525333
--- /dev/null
+++ b/vendor/phar-io/manifest/src/values/Url.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class Url {
+    /** @var string */
+    private $url;
+
+    public function __construct(string $url) {
+        $this->ensureUrlIsValid($url);
+
+        $this->url = $url;
+    }
+
+    public function asString(): string {
+        return $this->url;
+    }
+
+    /**
+     * @param string $url
+     *
+     * @throws InvalidUrlException
+     */
+    private function ensureUrlIsValid($url): void {
+        if (\filter_var($url, \FILTER_VALIDATE_URL) === false) {
+            throw new InvalidUrlException;
+        }
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/AuthorElement.php b/vendor/phar-io/manifest/src/xml/AuthorElement.php
new file mode 100644
index 000000000..c454b271a
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/AuthorElement.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class AuthorElement extends ManifestElement {
+    public function getName(): string {
+        return $this->getAttributeValue('name');
+    }
+
+    public function getEmail(): string {
+        return $this->getAttributeValue('email');
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/AuthorElementCollection.php b/vendor/phar-io/manifest/src/xml/AuthorElementCollection.php
new file mode 100644
index 000000000..a54147eb4
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/AuthorElementCollection.php
@@ -0,0 +1,18 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class AuthorElementCollection extends ElementCollection {
+    public function current(): AuthorElement {
+        return new AuthorElement(
+            $this->getCurrentElement()
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/BundlesElement.php b/vendor/phar-io/manifest/src/xml/BundlesElement.php
new file mode 100644
index 000000000..eb2105acd
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/BundlesElement.php
@@ -0,0 +1,18 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class BundlesElement extends ManifestElement {
+    public function getComponentElements(): ComponentElementCollection {
+        return new ComponentElementCollection(
+            $this->getChildrenByName('component')
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ComponentElement.php b/vendor/phar-io/manifest/src/xml/ComponentElement.php
new file mode 100644
index 000000000..7f6a5ec9a
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ComponentElement.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ComponentElement extends ManifestElement {
+    public function getName(): string {
+        return $this->getAttributeValue('name');
+    }
+
+    public function getVersion(): string {
+        return $this->getAttributeValue('version');
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ComponentElementCollection.php b/vendor/phar-io/manifest/src/xml/ComponentElementCollection.php
new file mode 100644
index 000000000..23bcbd2f1
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ComponentElementCollection.php
@@ -0,0 +1,18 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ComponentElementCollection extends ElementCollection {
+    public function current(): ComponentElement {
+        return new ComponentElement(
+            $this->getCurrentElement()
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ContainsElement.php b/vendor/phar-io/manifest/src/xml/ContainsElement.php
new file mode 100644
index 000000000..ebef49d9b
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ContainsElement.php
@@ -0,0 +1,30 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ContainsElement extends ManifestElement {
+    public function getName(): string {
+        return $this->getAttributeValue('name');
+    }
+
+    public function getVersion(): string {
+        return $this->getAttributeValue('version');
+    }
+
+    public function getType(): string {
+        return $this->getAttributeValue('type');
+    }
+
+    public function getExtensionElement(): ExtensionElement {
+        return new ExtensionElement(
+            $this->getChildByName('extension')
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/CopyrightElement.php b/vendor/phar-io/manifest/src/xml/CopyrightElement.php
new file mode 100644
index 000000000..3debe7dcd
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/CopyrightElement.php
@@ -0,0 +1,24 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class CopyrightElement extends ManifestElement {
+    public function getAuthorElements(): AuthorElementCollection {
+        return new AuthorElementCollection(
+            $this->getChildrenByName('author')
+        );
+    }
+
+    public function getLicenseElement(): LicenseElement {
+        return new LicenseElement(
+            $this->getChildByName('license')
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ElementCollection.php b/vendor/phar-io/manifest/src/xml/ElementCollection.php
new file mode 100644
index 000000000..26d9250f3
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ElementCollection.php
@@ -0,0 +1,61 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use DOMElement;
+use DOMNodeList;
+
+abstract class ElementCollection implements \Iterator {
+    /** @var DOMElement[] */
+    private $nodes = [];
+
+    /** @var int */
+    private $position;
+
+    public function __construct(DOMNodeList $nodeList) {
+        $this->position = 0;
+        $this->importNodes($nodeList);
+    }
+
+    #[\ReturnTypeWillChange]
+    abstract public function current();
+
+    public function next(): void {
+        $this->position++;
+    }
+
+    public function key(): int {
+        return $this->position;
+    }
+
+    public function valid(): bool {
+        return $this->position < \count($this->nodes);
+    }
+
+    public function rewind(): void {
+        $this->position = 0;
+    }
+
+    protected function getCurrentElement(): DOMElement {
+        return $this->nodes[$this->position];
+    }
+
+    private function importNodes(DOMNodeList $nodeList): void {
+        foreach ($nodeList as $node) {
+            if (!$node instanceof DOMElement) {
+                throw new ElementCollectionException(
+                    \sprintf('\DOMElement expected, got \%s', \get_class($node))
+                );
+            }
+
+            $this->nodes[] = $node;
+        }
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ExtElement.php b/vendor/phar-io/manifest/src/xml/ExtElement.php
new file mode 100644
index 000000000..257853c43
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ExtElement.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ExtElement extends ManifestElement {
+    public function getName(): string {
+        return $this->getAttributeValue('name');
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ExtElementCollection.php b/vendor/phar-io/manifest/src/xml/ExtElementCollection.php
new file mode 100644
index 000000000..059773490
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ExtElementCollection.php
@@ -0,0 +1,18 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ExtElementCollection extends ElementCollection {
+    public function current(): ExtElement {
+        return new ExtElement(
+            $this->getCurrentElement()
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ExtensionElement.php b/vendor/phar-io/manifest/src/xml/ExtensionElement.php
new file mode 100644
index 000000000..db067f996
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ExtensionElement.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class ExtensionElement extends ManifestElement {
+    public function getFor(): string {
+        return $this->getAttributeValue('for');
+    }
+
+    public function getCompatible(): string {
+        return $this->getAttributeValue('compatible');
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/LicenseElement.php b/vendor/phar-io/manifest/src/xml/LicenseElement.php
new file mode 100644
index 000000000..658c3d1c2
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/LicenseElement.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class LicenseElement extends ManifestElement {
+    public function getType(): string {
+        return $this->getAttributeValue('type');
+    }
+
+    public function getUrl(): string {
+        return $this->getAttributeValue('url');
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ManifestDocument.php b/vendor/phar-io/manifest/src/xml/ManifestDocument.php
new file mode 100644
index 000000000..f88b28293
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ManifestDocument.php
@@ -0,0 +1,103 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use DOMDocument;
+use DOMElement;
+
+class ManifestDocument {
+    public const XMLNS = 'https://phar.io/xml/manifest/1.0';
+
+    /** @var DOMDocument */
+    private $dom;
+
+    public static function fromFile(string $filename): ManifestDocument {
+        if (!\file_exists($filename)) {
+            throw new ManifestDocumentException(
+                \sprintf('File "%s" not found', $filename)
+            );
+        }
+
+        return self::fromString(
+            \file_get_contents($filename)
+        );
+    }
+
+    public static function fromString(string $xmlString): ManifestDocument {
+        $prev = \libxml_use_internal_errors(true);
+        \libxml_clear_errors();
+
+        $dom = new DOMDocument();
+        $dom->loadXML($xmlString);
+
+        $errors = \libxml_get_errors();
+        \libxml_use_internal_errors($prev);
+
+        if (\count($errors) !== 0) {
+            throw new ManifestDocumentLoadingException($errors);
+        }
+
+        return new self($dom);
+    }
+
+    private function __construct(DOMDocument $dom) {
+        $this->ensureCorrectDocumentType($dom);
+
+        $this->dom = $dom;
+    }
+
+    public function getContainsElement(): ContainsElement {
+        return new ContainsElement(
+            $this->fetchElementByName('contains')
+        );
+    }
+
+    public function getCopyrightElement(): CopyrightElement {
+        return new CopyrightElement(
+            $this->fetchElementByName('copyright')
+        );
+    }
+
+    public function getRequiresElement(): RequiresElement {
+        return new RequiresElement(
+            $this->fetchElementByName('requires')
+        );
+    }
+
+    public function hasBundlesElement(): bool {
+        return $this->dom->getElementsByTagNameNS(self::XMLNS, 'bundles')->length === 1;
+    }
+
+    public function getBundlesElement(): BundlesElement {
+        return new BundlesElement(
+            $this->fetchElementByName('bundles')
+        );
+    }
+
+    private function ensureCorrectDocumentType(DOMDocument $dom): void {
+        $root = $dom->documentElement;
+
+        if ($root->localName !== 'phar' || $root->namespaceURI !== self::XMLNS) {
+            throw new ManifestDocumentException('Not a phar.io manifest document');
+        }
+    }
+
+    private function fetchElementByName(string $elementName): DOMElement {
+        $element = $this->dom->getElementsByTagNameNS(self::XMLNS, $elementName)->item(0);
+
+        if (!$element instanceof DOMElement) {
+            throw new ManifestDocumentException(
+                \sprintf('Element %s missing', $elementName)
+            );
+        }
+
+        return $element;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/ManifestElement.php b/vendor/phar-io/manifest/src/xml/ManifestElement.php
new file mode 100644
index 000000000..1f57f547d
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/ManifestElement.php
@@ -0,0 +1,66 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+use DOMElement;
+use DOMNodeList;
+
+class ManifestElement {
+    public const XMLNS = 'https://phar.io/xml/manifest/1.0';
+
+    /** @var DOMElement */
+    private $element;
+
+    public function __construct(DOMElement $element) {
+        $this->element = $element;
+    }
+
+    protected function getAttributeValue(string $name): string {
+        if (!$this->element->hasAttribute($name)) {
+            throw new ManifestElementException(
+                \sprintf(
+                    'Attribute %s not set on element %s',
+                    $name,
+                    $this->element->localName
+                )
+            );
+        }
+
+        return $this->element->getAttribute($name);
+    }
+
+    protected function getChildByName(string $elementName): DOMElement {
+        $element = $this->element->getElementsByTagNameNS(self::XMLNS, $elementName)->item(0);
+
+        if (!$element instanceof DOMElement) {
+            throw new ManifestElementException(
+                \sprintf('Element %s missing', $elementName)
+            );
+        }
+
+        return $element;
+    }
+
+    protected function getChildrenByName(string $elementName): DOMNodeList {
+        $elementList = $this->element->getElementsByTagNameNS(self::XMLNS, $elementName);
+
+        if ($elementList->length === 0) {
+            throw new ManifestElementException(
+                \sprintf('Element(s) %s missing', $elementName)
+            );
+        }
+
+        return $elementList;
+    }
+
+    protected function hasChild(string $elementName): bool {
+        return $this->element->getElementsByTagNameNS(self::XMLNS, $elementName)->length !== 0;
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/PhpElement.php b/vendor/phar-io/manifest/src/xml/PhpElement.php
new file mode 100644
index 000000000..c5c906c96
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/PhpElement.php
@@ -0,0 +1,26 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class PhpElement extends ManifestElement {
+    public function getVersion(): string {
+        return $this->getAttributeValue('version');
+    }
+
+    public function hasExtElements(): bool {
+        return $this->hasChild('ext');
+    }
+
+    public function getExtElements(): ExtElementCollection {
+        return new ExtElementCollection(
+            $this->getChildrenByName('ext')
+        );
+    }
+}
diff --git a/vendor/phar-io/manifest/src/xml/RequiresElement.php b/vendor/phar-io/manifest/src/xml/RequiresElement.php
new file mode 100644
index 000000000..b7cd41ef7
--- /dev/null
+++ b/vendor/phar-io/manifest/src/xml/RequiresElement.php
@@ -0,0 +1,18 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <[email protected]>, Sebastian Heuer <[email protected]>, Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Manifest;
+
+class RequiresElement extends ManifestElement {
+    public function getPHPElement(): PhpElement {
+        return new PhpElement(
+            $this->getChildByName('php')
+        );
+    }
+}