* 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

20 files changed, 2002 insertions, 0 deletions

diff --git a/vendor/sebastian/diff/ChangeLog.md b/vendor/sebastian/diff/ChangeLog.md
new file mode 100644
index 000000000..9bdcc5b6d
--- /dev/null
+++ b/vendor/sebastian/diff/ChangeLog.md
@@ -0,0 +1,88 @@
+# ChangeLog
+
+All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [4.0.4] - 2020-10-26
+
+### Fixed
+
+* `SebastianBergmann\Diff\Exception` now correctly extends `\Throwable`
+
+## [4.0.3] - 2020-09-28
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.3 || ^8.0` to `>=7.3`
+
+## [4.0.2] - 2020-06-30
+
+### Added
+
+* This component is now supported on PHP 8
+
+## [4.0.1] - 2020-05-08
+
+### Fixed
+
+* [#99](https://github.com/sebastianbergmann/diff/pull/99): Regression in unified diff output of identical strings
+
+## [4.0.0] - 2020-02-07
+
+### Removed
+
+* Removed support for PHP 7.1 and PHP 7.2
+
+## [3.0.2] - 2019-02-04
+
+### Changed
+
+* `Chunk::setLines()` now ensures that the `$lines` array only contains `Line` objects
+
+## [3.0.1] - 2018-06-10
+
+### Fixed
+
+* Removed `"minimum-stability": "dev",` from `composer.json`
+
+## [3.0.0] - 2018-02-01
+
+* The `StrictUnifiedDiffOutputBuilder` implementation of the `DiffOutputBuilderInterface` was added
+
+### Changed
+
+* The default `DiffOutputBuilderInterface` implementation now generates context lines (unchanged lines)
+
+### Removed
+
+* Removed support for PHP 7.0
+
+### Fixed
+
+* [#70](https://github.com/sebastianbergmann/diff/issues/70): Diffing of arrays no longer works
+
+## [2.0.1] - 2017-08-03
+
+### Fixed
+
+* [#66](https://github.com/sebastianbergmann/diff/pull/66): Restored backwards compatibility for PHPUnit 6.1.4, 6.2.0, 6.2.1, 6.2.2, and 6.2.3
+
+## [2.0.0] - 2017-07-11 [YANKED]
+
+### Added
+
+* [#64](https://github.com/sebastianbergmann/diff/pull/64): Show line numbers for chunks of a diff
+
+### Removed
+
+* This component is no longer supported on PHP 5.6
+
+[4.0.4]: https://github.com/sebastianbergmann/diff/compare/4.0.3...4.0.4
+[4.0.3]: https://github.com/sebastianbergmann/diff/compare/4.0.2...4.0.3
+[4.0.2]: https://github.com/sebastianbergmann/diff/compare/4.0.1...4.0.2
+[4.0.1]: https://github.com/sebastianbergmann/diff/compare/4.0.0...4.0.1
+[4.0.0]: https://github.com/sebastianbergmann/diff/compare/3.0.2...4.0.0
+[3.0.2]: https://github.com/sebastianbergmann/diff/compare/3.0.1...3.0.2
+[3.0.1]: https://github.com/sebastianbergmann/diff/compare/3.0.0...3.0.1
+[3.0.0]: https://github.com/sebastianbergmann/diff/compare/2.0...3.0.0
+[2.0.1]: https://github.com/sebastianbergmann/diff/compare/c341c98ce083db77f896a0aa64f5ee7652915970...2.0.1
+[2.0.0]: https://github.com/sebastianbergmann/diff/compare/1.4...c341c98ce083db77f896a0aa64f5ee7652915970
diff --git a/vendor/sebastian/diff/LICENSE b/vendor/sebastian/diff/LICENSE
new file mode 100644
index 000000000..f22f31cf0
--- /dev/null
+++ b/vendor/sebastian/diff/LICENSE
@@ -0,0 +1,33 @@
+sebastian/diff
+
+Copyright (c) 2002-2020, Sebastian Bergmann <[email protected]>.
+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 Sebastian Bergmann nor the names of his
+   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 OWNER 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/sebastian/diff/README.md b/vendor/sebastian/diff/README.md
new file mode 100644
index 000000000..734b852de
--- /dev/null
+++ b/vendor/sebastian/diff/README.md
@@ -0,0 +1,202 @@
+# sebastian/diff
+
+[![CI Status](https://github.com/sebastianbergmann/diff/workflows/CI/badge.svg)](https://github.com/sebastianbergmann/diff/actions)
+[![Type Coverage](https://shepherd.dev/github/sebastianbergmann/diff/coverage.svg)](https://shepherd.dev/github/sebastianbergmann/diff)
+
+Diff implementation for PHP, factored out of PHPUnit into a stand-alone component.
+
+## Installation
+
+You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
+
+```
+composer require sebastian/diff
+```
+
+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 sebastian/diff
+```
+
+### Usage
+
+#### Generating diff
+
+The `Differ` class can be used to generate a textual representation of the difference between two strings:
+
+```php
+<?php
+use SebastianBergmann\Diff\Differ;
+
+$differ = new Differ;
+print $differ->diff('foo', 'bar');
+```
+
+The code above yields the output below:
+```diff
+--- Original
++++ New
+@@ @@
+-foo
++bar
+```
+
+There are three output builders available in this package:
+
+#### UnifiedDiffOutputBuilder
+
+This is default builder, which generates the output close to udiff and is used by PHPUnit.
+
+```php
+<?php
+
+use SebastianBergmann\Diff\Differ;
+use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
+
+$builder = new UnifiedDiffOutputBuilder(
+    "--- Original\n+++ New\n", // custom header
+    false                      // do not add line numbers to the diff 
+);
+
+$differ = new Differ($builder);
+print $differ->diff('foo', 'bar');
+```
+
+#### StrictUnifiedDiffOutputBuilder
+
+Generates (strict) Unified diff's (unidiffs) with hunks,
+similar to `diff -u` and compatible with `patch` and `git apply`.
+
+```php
+<?php
+
+use SebastianBergmann\Diff\Differ;
+use SebastianBergmann\Diff\Output\StrictUnifiedDiffOutputBuilder;
+
+$builder = new StrictUnifiedDiffOutputBuilder([
+    'collapseRanges'      => true, // ranges of length one are rendered with the trailing `,1`
+    'commonLineThreshold' => 6,    // number of same lines before ending a new hunk and creating a new one (if needed)
+    'contextLines'        => 3,    // like `diff:  -u, -U NUM, --unified[=NUM]`, for patch/git apply compatibility best to keep at least @ 3
+    'fromFile'            => null,
+    'fromFileDate'        => null,
+    'toFile'              => null,
+    'toFileDate'          => null,
+]);
+
+$differ = new Differ($builder);
+print $differ->diff('foo', 'bar');
+```
+
+#### DiffOnlyOutputBuilder
+
+Output only the lines that differ.
+
+```php
+<?php
+
+use SebastianBergmann\Diff\Differ;
+use SebastianBergmann\Diff\Output\DiffOnlyOutputBuilder;
+
+$builder = new DiffOnlyOutputBuilder(
+    "--- Original\n+++ New\n"
+);
+
+$differ = new Differ($builder);
+print $differ->diff('foo', 'bar');
+```
+
+#### DiffOutputBuilderInterface
+
+You can pass any output builder to the `Differ` class as longs as it implements the `DiffOutputBuilderInterface`.
+
+#### Parsing diff
+
+The `Parser` class can be used to parse a unified diff into an object graph:
+
+```php
+use SebastianBergmann\Diff\Parser;
+use SebastianBergmann\Git;
+
+$git = new Git('/usr/local/src/money');
+
+$diff = $git->getDiff(
+  '948a1a07768d8edd10dcefa8315c1cbeffb31833',
+  'c07a373d2399f3e686234c4f7f088d635eb9641b'
+);
+
+$parser = new Parser;
+
+print_r($parser->parse($diff));
+```
+
+The code above yields the output below:
+
+    Array
+    (
+        [0] => SebastianBergmann\Diff\Diff Object
+            (
+                [from:SebastianBergmann\Diff\Diff:private] => a/tests/MoneyTest.php
+                [to:SebastianBergmann\Diff\Diff:private] => b/tests/MoneyTest.php
+                [chunks:SebastianBergmann\Diff\Diff:private] => Array
+                    (
+                        [0] => SebastianBergmann\Diff\Chunk Object
+                            (
+                                [start:SebastianBergmann\Diff\Chunk:private] => 87
+                                [startRange:SebastianBergmann\Diff\Chunk:private] => 7
+                                [end:SebastianBergmann\Diff\Chunk:private] => 87
+                                [endRange:SebastianBergmann\Diff\Chunk:private] => 7
+                                [lines:SebastianBergmann\Diff\Chunk:private] => Array
+                                    (
+                                        [0] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 3
+                                                [content:SebastianBergmann\Diff\Line:private] =>      * @covers SebastianBergmann\Money\Money::add
+                                            )
+
+                                        [1] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 3
+                                                [content:SebastianBergmann\Diff\Line:private] =>      * @covers SebastianBergmann\Money\Money::newMoney
+                                            )
+
+                                        [2] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 3
+                                                [content:SebastianBergmann\Diff\Line:private] =>      */
+                                            )
+
+                                        [3] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 2
+                                                [content:SebastianBergmann\Diff\Line:private] =>     public function testAnotherMoneyWithSameCurrencyObjectCanBeAdded()
+                                            )
+
+                                        [4] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 1
+                                                [content:SebastianBergmann\Diff\Line:private] =>     public function testAnotherMoneyObjectWithSameCurrencyCanBeAdded()
+                                            )
+
+                                        [5] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 3
+                                                [content:SebastianBergmann\Diff\Line:private] =>     {
+                                            )
+
+                                        [6] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 3
+                                                [content:SebastianBergmann\Diff\Line:private] =>         $a = new Money(1, new Currency('EUR'));
+                                            )
+
+                                        [7] => SebastianBergmann\Diff\Line Object
+                                            (
+                                                [type:SebastianBergmann\Diff\Line:private] => 3
+                                                [content:SebastianBergmann\Diff\Line:private] =>         $b = new Money(2, new Currency('EUR'));
+                                            )
+                                    )
+                            )
+                    )
+            )
+    )
diff --git a/vendor/sebastian/diff/composer.json b/vendor/sebastian/diff/composer.json
new file mode 100644
index 000000000..cf92202ba
--- /dev/null
+++ b/vendor/sebastian/diff/composer.json
@@ -0,0 +1,47 @@
+{
+    "name": "sebastian/diff",
+    "description": "Diff implementation",
+    "keywords": ["diff", "udiff", "unidiff", "unified diff"],
+    "homepage": "https://github.com/sebastianbergmann/diff",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "Sebastian Bergmann",
+            "email": "[email protected]"
+        },
+        {
+            "name": "Kore Nordmann",
+            "email": "[email protected]"
+        }
+    ],
+    "prefer-stable": true,
+    "config": {
+        "platform": {
+            "php": "7.3.0"
+        },
+        "optimize-autoloader": true,
+        "sort-packages": true
+    },
+    "require": {
+        "php": ">=7.3"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.3",
+        "symfony/process": "^4.2 || ^5"
+    },
+    "autoload": {
+        "classmap": [
+            "src/"
+        ]
+    },
+    "autoload-dev": {
+        "classmap": [
+            "tests/"
+        ]
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "4.0-dev"
+        }
+    }
+}
diff --git a/vendor/sebastian/diff/src/Chunk.php b/vendor/sebastian/diff/src/Chunk.php
new file mode 100644
index 000000000..16ae34f41
--- /dev/null
+++ b/vendor/sebastian/diff/src/Chunk.php
@@ -0,0 +1,89 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+final class Chunk
+{
+    /**
+     * @var int
+     */
+    private $start;
+
+    /**
+     * @var int
+     */
+    private $startRange;
+
+    /**
+     * @var int
+     */
+    private $end;
+
+    /**
+     * @var int
+     */
+    private $endRange;
+
+    /**
+     * @var Line[]
+     */
+    private $lines;
+
+    public function __construct(int $start = 0, int $startRange = 1, int $end = 0, int $endRange = 1, array $lines = [])
+    {
+        $this->start      = $start;
+        $this->startRange = $startRange;
+        $this->end        = $end;
+        $this->endRange   = $endRange;
+        $this->lines      = $lines;
+    }
+
+    public function getStart(): int
+    {
+        return $this->start;
+    }
+
+    public function getStartRange(): int
+    {
+        return $this->startRange;
+    }
+
+    public function getEnd(): int
+    {
+        return $this->end;
+    }
+
+    public function getEndRange(): int
+    {
+        return $this->endRange;
+    }
+
+    /**
+     * @return Line[]
+     */
+    public function getLines(): array
+    {
+        return $this->lines;
+    }
+
+    /**
+     * @param Line[] $lines
+     */
+    public function setLines(array $lines): void
+    {
+        foreach ($lines as $line) {
+            if (!$line instanceof Line) {
+                throw new InvalidArgumentException;
+            }
+        }
+
+        $this->lines = $lines;
+    }
+}
diff --git a/vendor/sebastian/diff/src/Diff.php b/vendor/sebastian/diff/src/Diff.php
new file mode 100644
index 000000000..17b2084f9
--- /dev/null
+++ b/vendor/sebastian/diff/src/Diff.php
@@ -0,0 +1,64 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+final class Diff
+{
+    /**
+     * @var string
+     */
+    private $from;
+
+    /**
+     * @var string
+     */
+    private $to;
+
+    /**
+     * @var Chunk[]
+     */
+    private $chunks;
+
+    /**
+     * @param Chunk[] $chunks
+     */
+    public function __construct(string $from, string $to, array $chunks = [])
+    {
+        $this->from   = $from;
+        $this->to     = $to;
+        $this->chunks = $chunks;
+    }
+
+    public function getFrom(): string
+    {
+        return $this->from;
+    }
+
+    public function getTo(): string
+    {
+        return $this->to;
+    }
+
+    /**
+     * @return Chunk[]
+     */
+    public function getChunks(): array
+    {
+        return $this->chunks;
+    }
+
+    /**
+     * @param Chunk[] $chunks
+     */
+    public function setChunks(array $chunks): void
+    {
+        $this->chunks = $chunks;
+    }
+}
diff --git a/vendor/sebastian/diff/src/Differ.php b/vendor/sebastian/diff/src/Differ.php
new file mode 100644
index 000000000..5a4d9d102
--- /dev/null
+++ b/vendor/sebastian/diff/src/Differ.php
@@ -0,0 +1,327 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use const PHP_INT_SIZE;
+use const PREG_SPLIT_DELIM_CAPTURE;
+use const PREG_SPLIT_NO_EMPTY;
+use function array_shift;
+use function array_unshift;
+use function array_values;
+use function count;
+use function current;
+use function end;
+use function get_class;
+use function gettype;
+use function is_array;
+use function is_object;
+use function is_string;
+use function key;
+use function min;
+use function preg_split;
+use function prev;
+use function reset;
+use function sprintf;
+use function substr;
+use SebastianBergmann\Diff\Output\DiffOutputBuilderInterface;
+use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
+
+final class Differ
+{
+    public const OLD                     = 0;
+
+    public const ADDED                   = 1;
+
+    public const REMOVED                 = 2;
+
+    public const DIFF_LINE_END_WARNING   = 3;
+
+    public const NO_LINE_END_EOF_WARNING = 4;
+
+    /**
+     * @var DiffOutputBuilderInterface
+     */
+    private $outputBuilder;
+
+    /**
+     * @param DiffOutputBuilderInterface $outputBuilder
+     *
+     * @throws InvalidArgumentException
+     */
+    public function __construct($outputBuilder = null)
+    {
+        if ($outputBuilder instanceof DiffOutputBuilderInterface) {
+            $this->outputBuilder = $outputBuilder;
+        } elseif (null === $outputBuilder) {
+            $this->outputBuilder = new UnifiedDiffOutputBuilder;
+        } elseif (is_string($outputBuilder)) {
+            // PHPUnit 6.1.4, 6.2.0, 6.2.1, 6.2.2, and 6.2.3 support
+            // @see https://github.com/sebastianbergmann/phpunit/issues/2734#issuecomment-314514056
+            // @deprecated
+            $this->outputBuilder = new UnifiedDiffOutputBuilder($outputBuilder);
+        } else {
+            throw new InvalidArgumentException(
+                sprintf(
+                    'Expected builder to be an instance of DiffOutputBuilderInterface, <null> or a string, got %s.',
+                    is_object($outputBuilder) ? 'instance of "' . get_class($outputBuilder) . '"' : gettype($outputBuilder) . ' "' . $outputBuilder . '"'
+                )
+            );
+        }
+    }
+
+    /**
+     * Returns the diff between two arrays or strings as string.
+     *
+     * @param array|string $from
+     * @param array|string $to
+     */
+    public function diff($from, $to, LongestCommonSubsequenceCalculator $lcs = null): string
+    {
+        $diff = $this->diffToArray(
+            $this->normalizeDiffInput($from),
+            $this->normalizeDiffInput($to),
+            $lcs
+        );
+
+        return $this->outputBuilder->getDiff($diff);
+    }
+
+    /**
+     * Returns the diff between two arrays or strings as array.
+     *
+     * Each array element contains two elements:
+     *   - [0] => mixed $token
+     *   - [1] => 2|1|0
+     *
+     * - 2: REMOVED: $token was removed from $from
+     * - 1: ADDED: $token was added to $from
+     * - 0: OLD: $token is not changed in $to
+     *
+     * @param array|string                       $from
+     * @param array|string                       $to
+     * @param LongestCommonSubsequenceCalculator $lcs
+     */
+    public function diffToArray($from, $to, LongestCommonSubsequenceCalculator $lcs = null): array
+    {
+        if (is_string($from)) {
+            $from = $this->splitStringByLines($from);
+        } elseif (!is_array($from)) {
+            throw new InvalidArgumentException('"from" must be an array or string.');
+        }
+
+        if (is_string($to)) {
+            $to = $this->splitStringByLines($to);
+        } elseif (!is_array($to)) {
+            throw new InvalidArgumentException('"to" must be an array or string.');
+        }
+
+        [$from, $to, $start, $end] = self::getArrayDiffParted($from, $to);
+
+        if ($lcs === null) {
+            $lcs = $this->selectLcsImplementation($from, $to);
+        }
+
+        $common = $lcs->calculate(array_values($from), array_values($to));
+        $diff   = [];
+
+        foreach ($start as $token) {
+            $diff[] = [$token, self::OLD];
+        }
+
+        reset($from);
+        reset($to);
+
+        foreach ($common as $token) {
+            while (($fromToken = reset($from)) !== $token) {
+                $diff[] = [array_shift($from), self::REMOVED];
+            }
+
+            while (($toToken = reset($to)) !== $token) {
+                $diff[] = [array_shift($to), self::ADDED];
+            }
+
+            $diff[] = [$token, self::OLD];
+
+            array_shift($from);
+            array_shift($to);
+        }
+
+        while (($token = array_shift($from)) !== null) {
+            $diff[] = [$token, self::REMOVED];
+        }
+
+        while (($token = array_shift($to)) !== null) {
+            $diff[] = [$token, self::ADDED];
+        }
+
+        foreach ($end as $token) {
+            $diff[] = [$token, self::OLD];
+        }
+
+        if ($this->detectUnmatchedLineEndings($diff)) {
+            array_unshift($diff, ["#Warning: Strings contain different line endings!\n", self::DIFF_LINE_END_WARNING]);
+        }
+
+        return $diff;
+    }
+
+    /**
+     * Casts variable to string if it is not a string or array.
+     *
+     * @return array|string
+     */
+    private function normalizeDiffInput($input)
+    {
+        if (!is_array($input) && !is_string($input)) {
+            return (string) $input;
+        }
+
+        return $input;
+    }
+
+    /**
+     * Checks if input is string, if so it will split it line-by-line.
+     */
+    private function splitStringByLines(string $input): array
+    {
+        return preg_split('/(.*\R)/', $input, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
+    }
+
+    private function selectLcsImplementation(array $from, array $to): LongestCommonSubsequenceCalculator
+    {
+        // We do not want to use the time-efficient implementation if its memory
+        // footprint will probably exceed this value. Note that the footprint
+        // calculation is only an estimation for the matrix and the LCS method
+        // will typically allocate a bit more memory than this.
+        $memoryLimit = 100 * 1024 * 1024;
+
+        if ($this->calculateEstimatedFootprint($from, $to) > $memoryLimit) {
+            return new MemoryEfficientLongestCommonSubsequenceCalculator;
+        }
+
+        return new TimeEfficientLongestCommonSubsequenceCalculator;
+    }
+
+    /**
+     * Calculates the estimated memory footprint for the DP-based method.
+     *
+     * @return float|int
+     */
+    private function calculateEstimatedFootprint(array $from, array $to)
+    {
+        $itemSize = PHP_INT_SIZE === 4 ? 76 : 144;
+
+        return $itemSize * min(count($from), count($to)) ** 2;
+    }
+
+    /**
+     * Returns true if line ends don't match in a diff.
+     */
+    private function detectUnmatchedLineEndings(array $diff): bool
+    {
+        $newLineBreaks = ['' => true];
+        $oldLineBreaks = ['' => true];
+
+        foreach ($diff as $entry) {
+            if (self::OLD === $entry[1]) {
+                $ln                 = $this->getLinebreak($entry[0]);
+                $oldLineBreaks[$ln] = true;
+                $newLineBreaks[$ln] = true;
+            } elseif (self::ADDED === $entry[1]) {
+                $newLineBreaks[$this->getLinebreak($entry[0])] = true;
+            } elseif (self::REMOVED === $entry[1]) {
+                $oldLineBreaks[$this->getLinebreak($entry[0])] = true;
+            }
+        }
+
+        // if either input or output is a single line without breaks than no warning should be raised
+        if (['' => true] === $newLineBreaks || ['' => true] === $oldLineBreaks) {
+            return false;
+        }
+
+        // two way compare
+        foreach ($newLineBreaks as $break => $set) {
+            if (!isset($oldLineBreaks[$break])) {
+                return true;
+            }
+        }
+
+        foreach ($oldLineBreaks as $break => $set) {
+            if (!isset($newLineBreaks[$break])) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function getLinebreak($line): string
+    {
+        if (!is_string($line)) {
+            return '';
+        }
+
+        $lc = substr($line, -1);
+
+        if ("\r" === $lc) {
+            return "\r";
+        }
+
+        if ("\n" !== $lc) {
+            return '';
+        }
+
+        if ("\r\n" === substr($line, -2)) {
+            return "\r\n";
+        }
+
+        return "\n";
+    }
+
+    private static function getArrayDiffParted(array &$from, array &$to): array
+    {
+        $start = [];
+        $end   = [];
+
+        reset($to);
+
+        foreach ($from as $k => $v) {
+            $toK = key($to);
+
+            if ($toK === $k && $v === $to[$k]) {
+                $start[$k] = $v;
+
+                unset($from[$k], $to[$k]);
+            } else {
+                break;
+            }
+        }
+
+        end($from);
+        end($to);
+
+        do {
+            $fromK = key($from);
+            $toK   = key($to);
+
+            if (null === $fromK || null === $toK || current($from) !== current($to)) {
+                break;
+            }
+
+            prev($from);
+            prev($to);
+
+            $end = [$fromK => $from[$fromK]] + $end;
+            unset($from[$fromK], $to[$toK]);
+        } while (true);
+
+        return [$from, $to, $start, $end];
+    }
+}
diff --git a/vendor/sebastian/diff/src/Exception/ConfigurationException.php b/vendor/sebastian/diff/src/Exception/ConfigurationException.php
new file mode 100644
index 000000000..b767b2194
--- /dev/null
+++ b/vendor/sebastian/diff/src/Exception/ConfigurationException.php
@@ -0,0 +1,38 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use function get_class;
+use function gettype;
+use function is_object;
+use function sprintf;
+use Exception;
+
+final class ConfigurationException extends InvalidArgumentException
+{
+    public function __construct(
+        string $option,
+        string $expected,
+        $value,
+        int $code = 0,
+        Exception $previous = null
+    ) {
+        parent::__construct(
+            sprintf(
+                'Option "%s" must be %s, got "%s".',
+                $option,
+                $expected,
+                is_object($value) ? get_class($value) : (null === $value ? '<null>' : gettype($value) . '#' . $value)
+            ),
+            $code,
+            $previous
+        );
+    }
+}
diff --git a/vendor/sebastian/diff/src/Exception/Exception.php b/vendor/sebastian/diff/src/Exception/Exception.php
new file mode 100644
index 000000000..e20d32036
--- /dev/null
+++ b/vendor/sebastian/diff/src/Exception/Exception.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use Throwable;
+
+interface Exception extends Throwable
+{
+}
diff --git a/vendor/sebastian/diff/src/Exception/InvalidArgumentException.php b/vendor/sebastian/diff/src/Exception/InvalidArgumentException.php
new file mode 100644
index 000000000..846ac3fbd
--- /dev/null
+++ b/vendor/sebastian/diff/src/Exception/InvalidArgumentException.php
@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+class InvalidArgumentException extends \InvalidArgumentException implements Exception
+{
+}
diff --git a/vendor/sebastian/diff/src/Line.php b/vendor/sebastian/diff/src/Line.php
new file mode 100644
index 000000000..3596ed264
--- /dev/null
+++ b/vendor/sebastian/diff/src/Line.php
@@ -0,0 +1,45 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+final class Line
+{
+    public const ADDED     = 1;
+
+    public const REMOVED   = 2;
+
+    public const UNCHANGED = 3;
+
+    /**
+     * @var int
+     */
+    private $type;
+
+    /**
+     * @var string
+     */
+    private $content;
+
+    public function __construct(int $type = self::UNCHANGED, string $content = '')
+    {
+        $this->type    = $type;
+        $this->content = $content;
+    }
+
+    public function getContent(): string
+    {
+        return $this->content;
+    }
+
+    public function getType(): int
+    {
+        return $this->type;
+    }
+}
diff --git a/vendor/sebastian/diff/src/LongestCommonSubsequenceCalculator.php b/vendor/sebastian/diff/src/LongestCommonSubsequenceCalculator.php
new file mode 100644
index 000000000..dea8fe1cb
--- /dev/null
+++ b/vendor/sebastian/diff/src/LongestCommonSubsequenceCalculator.php
@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+interface LongestCommonSubsequenceCalculator
+{
+    /**
+     * Calculates the longest common subsequence of two arrays.
+     */
+    public function calculate(array $from, array $to): array;
+}
diff --git a/vendor/sebastian/diff/src/MemoryEfficientLongestCommonSubsequenceCalculator.php b/vendor/sebastian/diff/src/MemoryEfficientLongestCommonSubsequenceCalculator.php
new file mode 100644
index 000000000..0b626eaff
--- /dev/null
+++ b/vendor/sebastian/diff/src/MemoryEfficientLongestCommonSubsequenceCalculator.php
@@ -0,0 +1,88 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use function array_fill;
+use function array_merge;
+use function array_reverse;
+use function array_slice;
+use function count;
+use function in_array;
+use function max;
+
+final class MemoryEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function calculate(array $from, array $to): array
+    {
+        $cFrom = count($from);
+        $cTo   = count($to);
+
+        if ($cFrom === 0) {
+            return [];
+        }
+
+        if ($cFrom === 1) {
+            if (in_array($from[0], $to, true)) {
+                return [$from[0]];
+            }
+
+            return [];
+        }
+
+        $i         = (int) ($cFrom / 2);
+        $fromStart = array_slice($from, 0, $i);
+        $fromEnd   = array_slice($from, $i);
+        $llB       = $this->length($fromStart, $to);
+        $llE       = $this->length(array_reverse($fromEnd), array_reverse($to));
+        $jMax      = 0;
+        $max       = 0;
+
+        for ($j = 0; $j <= $cTo; $j++) {
+            $m = $llB[$j] + $llE[$cTo - $j];
+
+            if ($m >= $max) {
+                $max  = $m;
+                $jMax = $j;
+            }
+        }
+
+        $toStart = array_slice($to, 0, $jMax);
+        $toEnd   = array_slice($to, $jMax);
+
+        return array_merge(
+            $this->calculate($fromStart, $toStart),
+            $this->calculate($fromEnd, $toEnd)
+        );
+    }
+
+    private function length(array $from, array $to): array
+    {
+        $current = array_fill(0, count($to) + 1, 0);
+        $cFrom   = count($from);
+        $cTo     = count($to);
+
+        for ($i = 0; $i < $cFrom; $i++) {
+            $prev = $current;
+
+            for ($j = 0; $j < $cTo; $j++) {
+                if ($from[$i] === $to[$j]) {
+                    $current[$j + 1] = $prev[$j] + 1;
+                } else {
+                    $current[$j + 1] = max($current[$j], $prev[$j + 1]);
+                }
+            }
+        }
+
+        return $current;
+    }
+}
diff --git a/vendor/sebastian/diff/src/Output/AbstractChunkOutputBuilder.php b/vendor/sebastian/diff/src/Output/AbstractChunkOutputBuilder.php
new file mode 100644
index 000000000..e55757c38
--- /dev/null
+++ b/vendor/sebastian/diff/src/Output/AbstractChunkOutputBuilder.php
@@ -0,0 +1,52 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff\Output;
+
+use function count;
+
+abstract class AbstractChunkOutputBuilder implements DiffOutputBuilderInterface
+{
+    /**
+     * Takes input of the diff array and returns the common parts.
+     * Iterates through diff line by line.
+     */
+    protected function getCommonChunks(array $diff, int $lineThreshold = 5): array
+    {
+        $diffSize     = count($diff);
+        $capturing    = false;
+        $chunkStart   = 0;
+        $chunkSize    = 0;
+        $commonChunks = [];
+
+        for ($i = 0; $i < $diffSize; ++$i) {
+            if ($diff[$i][1] === 0 /* OLD */) {
+                if ($capturing === false) {
+                    $capturing  = true;
+                    $chunkStart = $i;
+                    $chunkSize  = 0;
+                } else {
+                    ++$chunkSize;
+                }
+            } elseif ($capturing !== false) {
+                if ($chunkSize >= $lineThreshold) {
+                    $commonChunks[$chunkStart] = $chunkStart + $chunkSize;
+                }
+
+                $capturing = false;
+            }
+        }
+
+        if ($capturing !== false && $chunkSize >= $lineThreshold) {
+            $commonChunks[$chunkStart] = $chunkStart + $chunkSize;
+        }
+
+        return $commonChunks;
+    }
+}
diff --git a/vendor/sebastian/diff/src/Output/DiffOnlyOutputBuilder.php b/vendor/sebastian/diff/src/Output/DiffOnlyOutputBuilder.php
new file mode 100644
index 000000000..f79a935cb
--- /dev/null
+++ b/vendor/sebastian/diff/src/Output/DiffOnlyOutputBuilder.php
@@ -0,0 +1,72 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff\Output;
+
+use function fclose;
+use function fopen;
+use function fwrite;
+use function stream_get_contents;
+use function substr;
+use SebastianBergmann\Diff\Differ;
+
+/**
+ * Builds a diff string representation in a loose unified diff format
+ * listing only changes lines. Does not include line numbers.
+ */
+final class DiffOnlyOutputBuilder implements DiffOutputBuilderInterface
+{
+    /**
+     * @var string
+     */
+    private $header;
+
+    public function __construct(string $header = "--- Original\n+++ New\n")
+    {
+        $this->header = $header;
+    }
+
+    public function getDiff(array $diff): string
+    {
+        $buffer = fopen('php://memory', 'r+b');
+
+        if ('' !== $this->header) {
+            fwrite($buffer, $this->header);
+
+            if ("\n" !== substr($this->header, -1, 1)) {
+                fwrite($buffer, "\n");
+            }
+        }
+
+        foreach ($diff as $diffEntry) {
+            if ($diffEntry[1] === Differ::ADDED) {
+                fwrite($buffer, '+' . $diffEntry[0]);
+            } elseif ($diffEntry[1] === Differ::REMOVED) {
+                fwrite($buffer, '-' . $diffEntry[0]);
+            } elseif ($diffEntry[1] === Differ::DIFF_LINE_END_WARNING) {
+                fwrite($buffer, ' ' . $diffEntry[0]);
+
+                continue; // Warnings should not be tested for line break, it will always be there
+            } else { /* Not changed (old) 0 */
+                continue; // we didn't write the non changs line, so do not add a line break either
+            }
+
+            $lc = substr($diffEntry[0], -1);
+
+            if ($lc !== "\n" && $lc !== "\r") {
+                fwrite($buffer, "\n"); // \No newline at end of file
+            }
+        }
+
+        $diff = stream_get_contents($buffer, -1, 0);
+        fclose($buffer);
+
+        return $diff;
+    }
+}
diff --git a/vendor/sebastian/diff/src/Output/DiffOutputBuilderInterface.php b/vendor/sebastian/diff/src/Output/DiffOutputBuilderInterface.php
new file mode 100644
index 000000000..0e18f9f2e
--- /dev/null
+++ b/vendor/sebastian/diff/src/Output/DiffOutputBuilderInterface.php
@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff\Output;
+
+/**
+ * Defines how an output builder should take a generated
+ * diff array and return a string representation of that diff.
+ */
+interface DiffOutputBuilderInterface
+{
+    public function getDiff(array $diff): string;
+}
diff --git a/vendor/sebastian/diff/src/Output/StrictUnifiedDiffOutputBuilder.php b/vendor/sebastian/diff/src/Output/StrictUnifiedDiffOutputBuilder.php
new file mode 100644
index 000000000..9c55ab2aa
--- /dev/null
+++ b/vendor/sebastian/diff/src/Output/StrictUnifiedDiffOutputBuilder.php
@@ -0,0 +1,338 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff\Output;
+
+use function array_merge;
+use function array_splice;
+use function count;
+use function fclose;
+use function fopen;
+use function fwrite;
+use function is_bool;
+use function is_int;
+use function is_string;
+use function max;
+use function min;
+use function sprintf;
+use function stream_get_contents;
+use function substr;
+use SebastianBergmann\Diff\ConfigurationException;
+use SebastianBergmann\Diff\Differ;
+
+/**
+ * Strict Unified diff output builder.
+ *
+ * Generates (strict) Unified diff's (unidiffs) with hunks.
+ */
+final class StrictUnifiedDiffOutputBuilder implements DiffOutputBuilderInterface
+{
+    private static $default = [
+        'collapseRanges'      => true, // ranges of length one are rendered with the trailing `,1`
+        'commonLineThreshold' => 6,    // number of same lines before ending a new hunk and creating a new one (if needed)
+        'contextLines'        => 3,    // like `diff:  -u, -U NUM, --unified[=NUM]`, for patch/git apply compatibility best to keep at least @ 3
+        'fromFile'            => null,
+        'fromFileDate'        => null,
+        'toFile'              => null,
+        'toFileDate'          => null,
+    ];
+
+    /**
+     * @var bool
+     */
+    private $changed;
+
+    /**
+     * @var bool
+     */
+    private $collapseRanges;
+
+    /**
+     * @var int >= 0
+     */
+    private $commonLineThreshold;
+
+    /**
+     * @var string
+     */
+    private $header;
+
+    /**
+     * @var int >= 0
+     */
+    private $contextLines;
+
+    public function __construct(array $options = [])
+    {
+        $options = array_merge(self::$default, $options);
+
+        if (!is_bool($options['collapseRanges'])) {
+            throw new ConfigurationException('collapseRanges', 'a bool', $options['collapseRanges']);
+        }
+
+        if (!is_int($options['contextLines']) || $options['contextLines'] < 0) {
+            throw new ConfigurationException('contextLines', 'an int >= 0', $options['contextLines']);
+        }
+
+        if (!is_int($options['commonLineThreshold']) || $options['commonLineThreshold'] <= 0) {
+            throw new ConfigurationException('commonLineThreshold', 'an int > 0', $options['commonLineThreshold']);
+        }
+
+        $this->assertString($options, 'fromFile');
+        $this->assertString($options, 'toFile');
+        $this->assertStringOrNull($options, 'fromFileDate');
+        $this->assertStringOrNull($options, 'toFileDate');
+
+        $this->header = sprintf(
+            "--- %s%s\n+++ %s%s\n",
+            $options['fromFile'],
+            null === $options['fromFileDate'] ? '' : "\t" . $options['fromFileDate'],
+            $options['toFile'],
+            null === $options['toFileDate'] ? '' : "\t" . $options['toFileDate']
+        );
+
+        $this->collapseRanges      = $options['collapseRanges'];
+        $this->commonLineThreshold = $options['commonLineThreshold'];
+        $this->contextLines        = $options['contextLines'];
+    }
+
+    public function getDiff(array $diff): string
+    {
+        if (0 === count($diff)) {
+            return '';
+        }
+
+        $this->changed = false;
+
+        $buffer = fopen('php://memory', 'r+b');
+        fwrite($buffer, $this->header);
+
+        $this->writeDiffHunks($buffer, $diff);
+
+        if (!$this->changed) {
+            fclose($buffer);
+
+            return '';
+        }
+
+        $diff = stream_get_contents($buffer, -1, 0);
+
+        fclose($buffer);
+
+        // If the last char is not a linebreak: add it.
+        // This might happen when both the `from` and `to` do not have a trailing linebreak
+        $last = substr($diff, -1);
+
+        return "\n" !== $last && "\r" !== $last
+            ? $diff . "\n"
+            : $diff;
+    }
+
+    private function writeDiffHunks($output, array $diff): void
+    {
+        // detect "No newline at end of file" and insert into `$diff` if needed
+
+        $upperLimit = count($diff);
+
+        if (0 === $diff[$upperLimit - 1][1]) {
+            $lc = substr($diff[$upperLimit - 1][0], -1);
+
+            if ("\n" !== $lc) {
+                array_splice($diff, $upperLimit, 0, [["\n\\ No newline at end of file\n", Differ::NO_LINE_END_EOF_WARNING]]);
+            }
+        } else {
+            // search back for the last `+` and `-` line,
+            // check if has trailing linebreak, else add under it warning under it
+            $toFind = [1 => true, 2 => true];
+
+            for ($i = $upperLimit - 1; $i >= 0; --$i) {
+                if (isset($toFind[$diff[$i][1]])) {
+                    unset($toFind[$diff[$i][1]]);
+                    $lc = substr($diff[$i][0], -1);
+
+                    if ("\n" !== $lc) {
+                        array_splice($diff, $i + 1, 0, [["\n\\ No newline at end of file\n", Differ::NO_LINE_END_EOF_WARNING]]);
+                    }
+
+                    if (!count($toFind)) {
+                        break;
+                    }
+                }
+            }
+        }
+
+        // write hunks to output buffer
+
+        $cutOff      = max($this->commonLineThreshold, $this->contextLines);
+        $hunkCapture = false;
+        $sameCount   = $toRange = $fromRange = 0;
+        $toStart     = $fromStart = 1;
+        $i           = 0;
+
+        /** @var int $i */
+        foreach ($diff as $i => $entry) {
+            if (0 === $entry[1]) { // same
+                if (false === $hunkCapture) {
+                    ++$fromStart;
+                    ++$toStart;
+
+                    continue;
+                }
+
+                ++$sameCount;
+                ++$toRange;
+                ++$fromRange;
+
+                if ($sameCount === $cutOff) {
+                    $contextStartOffset = ($hunkCapture - $this->contextLines) < 0
+                        ? $hunkCapture
+                        : $this->contextLines;
+
+                    // note: $contextEndOffset = $this->contextLines;
+                    //
+                    // because we never go beyond the end of the diff.
+                    // with the cutoff/contextlines here the follow is never true;
+                    //
+                    // if ($i - $cutOff + $this->contextLines + 1 > \count($diff)) {
+                    //    $contextEndOffset = count($diff) - 1;
+                    // }
+                    //
+                    // ; that would be true for a trailing incomplete hunk case which is dealt with after this loop
+
+                    $this->writeHunk(
+                        $diff,
+                        $hunkCapture - $contextStartOffset,
+                        $i - $cutOff + $this->contextLines + 1,
+                        $fromStart - $contextStartOffset,
+                        $fromRange - $cutOff + $contextStartOffset + $this->contextLines,
+                        $toStart - $contextStartOffset,
+                        $toRange - $cutOff + $contextStartOffset + $this->contextLines,
+                        $output
+                    );
+
+                    $fromStart += $fromRange;
+                    $toStart += $toRange;
+
+                    $hunkCapture = false;
+                    $sameCount   = $toRange = $fromRange = 0;
+                }
+
+                continue;
+            }
+
+            $sameCount = 0;
+
+            if ($entry[1] === Differ::NO_LINE_END_EOF_WARNING) {
+                continue;
+            }
+
+            $this->changed = true;
+
+            if (false === $hunkCapture) {
+                $hunkCapture = $i;
+            }
+
+            if (Differ::ADDED === $entry[1]) { // added
+                ++$toRange;
+            }
+
+            if (Differ::REMOVED === $entry[1]) { // removed
+                ++$fromRange;
+            }
+        }
+
+        if (false === $hunkCapture) {
+            return;
+        }
+
+        // we end here when cutoff (commonLineThreshold) was not reached, but we where capturing a hunk,
+        // do not render hunk till end automatically because the number of context lines might be less than the commonLineThreshold
+
+        $contextStartOffset = $hunkCapture - $this->contextLines < 0
+            ? $hunkCapture
+            : $this->contextLines;
+
+        // prevent trying to write out more common lines than there are in the diff _and_
+        // do not write more than configured through the context lines
+        $contextEndOffset = min($sameCount, $this->contextLines);
+
+        $fromRange -= $sameCount;
+        $toRange -= $sameCount;
+
+        $this->writeHunk(
+            $diff,
+            $hunkCapture - $contextStartOffset,
+            $i - $sameCount + $contextEndOffset + 1,
+            $fromStart - $contextStartOffset,
+            $fromRange + $contextStartOffset + $contextEndOffset,
+            $toStart - $contextStartOffset,
+            $toRange + $contextStartOffset + $contextEndOffset,
+            $output
+        );
+    }
+
+    private function writeHunk(
+        array $diff,
+        int $diffStartIndex,
+        int $diffEndIndex,
+        int $fromStart,
+        int $fromRange,
+        int $toStart,
+        int $toRange,
+        $output
+    ): void {
+        fwrite($output, '@@ -' . $fromStart);
+
+        if (!$this->collapseRanges || 1 !== $fromRange) {
+            fwrite($output, ',' . $fromRange);
+        }
+
+        fwrite($output, ' +' . $toStart);
+
+        if (!$this->collapseRanges || 1 !== $toRange) {
+            fwrite($output, ',' . $toRange);
+        }
+
+        fwrite($output, " @@\n");
+
+        for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
+            if ($diff[$i][1] === Differ::ADDED) {
+                $this->changed = true;
+                fwrite($output, '+' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === Differ::REMOVED) {
+                $this->changed = true;
+                fwrite($output, '-' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === Differ::OLD) {
+                fwrite($output, ' ' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === Differ::NO_LINE_END_EOF_WARNING) {
+                $this->changed = true;
+                fwrite($output, $diff[$i][0]);
+            }
+            //} elseif ($diff[$i][1] === Differ::DIFF_LINE_END_WARNING) { // custom comment inserted by PHPUnit/diff package
+                //  skip
+            //} else {
+                //  unknown/invalid
+            //}
+        }
+    }
+
+    private function assertString(array $options, string $option): void
+    {
+        if (!is_string($options[$option])) {
+            throw new ConfigurationException($option, 'a string', $options[$option]);
+        }
+    }
+
+    private function assertStringOrNull(array $options, string $option): void
+    {
+        if (null !== $options[$option] && !is_string($options[$option])) {
+            throw new ConfigurationException($option, 'a string or <null>', $options[$option]);
+        }
+    }
+}
diff --git a/vendor/sebastian/diff/src/Output/UnifiedDiffOutputBuilder.php b/vendor/sebastian/diff/src/Output/UnifiedDiffOutputBuilder.php
new file mode 100644
index 000000000..8aae64504
--- /dev/null
+++ b/vendor/sebastian/diff/src/Output/UnifiedDiffOutputBuilder.php
@@ -0,0 +1,272 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff\Output;
+
+use function array_splice;
+use function count;
+use function fclose;
+use function fopen;
+use function fwrite;
+use function max;
+use function min;
+use function stream_get_contents;
+use function strlen;
+use function substr;
+use SebastianBergmann\Diff\Differ;
+
+/**
+ * Builds a diff string representation in unified diff format in chunks.
+ */
+final class UnifiedDiffOutputBuilder extends AbstractChunkOutputBuilder
+{
+    /**
+     * @var bool
+     */
+    private $collapseRanges = true;
+
+    /**
+     * @var int >= 0
+     */
+    private $commonLineThreshold = 6;
+
+    /**
+     * @var int >= 0
+     */
+    private $contextLines = 3;
+
+    /**
+     * @var string
+     */
+    private $header;
+
+    /**
+     * @var bool
+     */
+    private $addLineNumbers;
+
+    public function __construct(string $header = "--- Original\n+++ New\n", bool $addLineNumbers = false)
+    {
+        $this->header         = $header;
+        $this->addLineNumbers = $addLineNumbers;
+    }
+
+    public function getDiff(array $diff): string
+    {
+        $buffer = fopen('php://memory', 'r+b');
+
+        if ('' !== $this->header) {
+            fwrite($buffer, $this->header);
+
+            if ("\n" !== substr($this->header, -1, 1)) {
+                fwrite($buffer, "\n");
+            }
+        }
+
+        if (0 !== count($diff)) {
+            $this->writeDiffHunks($buffer, $diff);
+        }
+
+        $diff = stream_get_contents($buffer, -1, 0);
+
+        fclose($buffer);
+
+        // If the diff is non-empty and last char is not a linebreak: add it.
+        // This might happen when both the `from` and `to` do not have a trailing linebreak
+        $last = substr($diff, -1);
+
+        return 0 !== strlen($diff) && "\n" !== $last && "\r" !== $last
+            ? $diff . "\n"
+            : $diff;
+    }
+
+    private function writeDiffHunks($output, array $diff): void
+    {
+        // detect "No newline at end of file" and insert into `$diff` if needed
+
+        $upperLimit = count($diff);
+
+        if (0 === $diff[$upperLimit - 1][1]) {
+            $lc = substr($diff[$upperLimit - 1][0], -1);
+
+            if ("\n" !== $lc) {
+                array_splice($diff, $upperLimit, 0, [["\n\\ No newline at end of file\n", Differ::NO_LINE_END_EOF_WARNING]]);
+            }
+        } else {
+            // search back for the last `+` and `-` line,
+            // check if has trailing linebreak, else add under it warning under it
+            $toFind = [1 => true, 2 => true];
+
+            for ($i = $upperLimit - 1; $i >= 0; --$i) {
+                if (isset($toFind[$diff[$i][1]])) {
+                    unset($toFind[$diff[$i][1]]);
+                    $lc = substr($diff[$i][0], -1);
+
+                    if ("\n" !== $lc) {
+                        array_splice($diff, $i + 1, 0, [["\n\\ No newline at end of file\n", Differ::NO_LINE_END_EOF_WARNING]]);
+                    }
+
+                    if (!count($toFind)) {
+                        break;
+                    }
+                }
+            }
+        }
+
+        // write hunks to output buffer
+
+        $cutOff      = max($this->commonLineThreshold, $this->contextLines);
+        $hunkCapture = false;
+        $sameCount   = $toRange   = $fromRange = 0;
+        $toStart     = $fromStart = 1;
+        $i           = 0;
+
+        /** @var int $i */
+        foreach ($diff as $i => $entry) {
+            if (0 === $entry[1]) { // same
+                if (false === $hunkCapture) {
+                    ++$fromStart;
+                    ++$toStart;
+
+                    continue;
+                }
+
+                ++$sameCount;
+                ++$toRange;
+                ++$fromRange;
+
+                if ($sameCount === $cutOff) {
+                    $contextStartOffset = ($hunkCapture - $this->contextLines) < 0
+                        ? $hunkCapture
+                        : $this->contextLines;
+
+                    // note: $contextEndOffset = $this->contextLines;
+                    //
+                    // because we never go beyond the end of the diff.
+                    // with the cutoff/contextlines here the follow is never true;
+                    //
+                    // if ($i - $cutOff + $this->contextLines + 1 > \count($diff)) {
+                    //    $contextEndOffset = count($diff) - 1;
+                    // }
+                    //
+                    // ; that would be true for a trailing incomplete hunk case which is dealt with after this loop
+
+                    $this->writeHunk(
+                        $diff,
+                        $hunkCapture - $contextStartOffset,
+                        $i - $cutOff + $this->contextLines + 1,
+                        $fromStart - $contextStartOffset,
+                        $fromRange - $cutOff + $contextStartOffset + $this->contextLines,
+                        $toStart - $contextStartOffset,
+                        $toRange - $cutOff + $contextStartOffset + $this->contextLines,
+                        $output
+                    );
+
+                    $fromStart += $fromRange;
+                    $toStart += $toRange;
+
+                    $hunkCapture = false;
+                    $sameCount   = $toRange = $fromRange = 0;
+                }
+
+                continue;
+            }
+
+            $sameCount = 0;
+
+            if ($entry[1] === Differ::NO_LINE_END_EOF_WARNING) {
+                continue;
+            }
+
+            if (false === $hunkCapture) {
+                $hunkCapture = $i;
+            }
+
+            if (Differ::ADDED === $entry[1]) {
+                ++$toRange;
+            }
+
+            if (Differ::REMOVED === $entry[1]) {
+                ++$fromRange;
+            }
+        }
+
+        if (false === $hunkCapture) {
+            return;
+        }
+
+        // we end here when cutoff (commonLineThreshold) was not reached, but we where capturing a hunk,
+        // do not render hunk till end automatically because the number of context lines might be less than the commonLineThreshold
+
+        $contextStartOffset = $hunkCapture - $this->contextLines < 0
+            ? $hunkCapture
+            : $this->contextLines;
+
+        // prevent trying to write out more common lines than there are in the diff _and_
+        // do not write more than configured through the context lines
+        $contextEndOffset = min($sameCount, $this->contextLines);
+
+        $fromRange -= $sameCount;
+        $toRange -= $sameCount;
+
+        $this->writeHunk(
+            $diff,
+            $hunkCapture - $contextStartOffset,
+            $i - $sameCount + $contextEndOffset + 1,
+            $fromStart - $contextStartOffset,
+            $fromRange + $contextStartOffset + $contextEndOffset,
+            $toStart - $contextStartOffset,
+            $toRange + $contextStartOffset + $contextEndOffset,
+            $output
+        );
+    }
+
+    private function writeHunk(
+        array $diff,
+        int $diffStartIndex,
+        int $diffEndIndex,
+        int $fromStart,
+        int $fromRange,
+        int $toStart,
+        int $toRange,
+        $output
+    ): void {
+        if ($this->addLineNumbers) {
+            fwrite($output, '@@ -' . $fromStart);
+
+            if (!$this->collapseRanges || 1 !== $fromRange) {
+                fwrite($output, ',' . $fromRange);
+            }
+
+            fwrite($output, ' +' . $toStart);
+
+            if (!$this->collapseRanges || 1 !== $toRange) {
+                fwrite($output, ',' . $toRange);
+            }
+
+            fwrite($output, " @@\n");
+        } else {
+            fwrite($output, "@@ @@\n");
+        }
+
+        for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
+            if ($diff[$i][1] === Differ::ADDED) {
+                fwrite($output, '+' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === Differ::REMOVED) {
+                fwrite($output, '-' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === Differ::OLD) {
+                fwrite($output, ' ' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === Differ::NO_LINE_END_EOF_WARNING) {
+                fwrite($output, "\n"); // $diff[$i][0]
+            } else { /* Not changed (old) Differ::OLD or Warning Differ::DIFF_LINE_END_WARNING */
+                fwrite($output, ' ' . $diff[$i][0]);
+            }
+        }
+    }
+}
diff --git a/vendor/sebastian/diff/src/Parser.php b/vendor/sebastian/diff/src/Parser.php
new file mode 100644
index 000000000..cc9e38871
--- /dev/null
+++ b/vendor/sebastian/diff/src/Parser.php
@@ -0,0 +1,110 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use function array_pop;
+use function count;
+use function max;
+use function preg_match;
+use function preg_split;
+
+/**
+ * Unified diff parser.
+ */
+final class Parser
+{
+    /**
+     * @return Diff[]
+     */
+    public function parse(string $string): array
+    {
+        $lines = preg_split('(\r\n|\r|\n)', $string);
+
+        if (!empty($lines) && $lines[count($lines) - 1] === '') {
+            array_pop($lines);
+        }
+
+        $lineCount = count($lines);
+        $diffs     = [];
+        $diff      = null;
+        $collected = [];
+
+        for ($i = 0; $i < $lineCount; ++$i) {
+            if (preg_match('#^---\h+"?(?P<file>[^\\v\\t"]+)#', $lines[$i], $fromMatch) &&
+                preg_match('#^\\+\\+\\+\\h+"?(?P<file>[^\\v\\t"]+)#', $lines[$i + 1], $toMatch)) {
+                if ($diff !== null) {
+                    $this->parseFileDiff($diff, $collected);
+
+                    $diffs[]   = $diff;
+                    $collected = [];
+                }
+
+                $diff = new Diff($fromMatch['file'], $toMatch['file']);
+
+                ++$i;
+            } else {
+                if (preg_match('/^(?:diff --git |index [\da-f\.]+|[+-]{3} [ab])/', $lines[$i])) {
+                    continue;
+                }
+
+                $collected[] = $lines[$i];
+            }
+        }
+
+        if ($diff !== null && count($collected)) {
+            $this->parseFileDiff($diff, $collected);
+
+            $diffs[] = $diff;
+        }
+
+        return $diffs;
+    }
+
+    private function parseFileDiff(Diff $diff, array $lines): void
+    {
+        $chunks    = [];
+        $chunk     = null;
+        $diffLines = [];
+
+        foreach ($lines as $line) {
+            if (preg_match('/^@@\s+-(?P<start>\d+)(?:,\s*(?P<startrange>\d+))?\s+\+(?P<end>\d+)(?:,\s*(?P<endrange>\d+))?\s+@@/', $line, $match)) {
+                $chunk = new Chunk(
+                    (int) $match['start'],
+                    isset($match['startrange']) ? max(1, (int) $match['startrange']) : 1,
+                    (int) $match['end'],
+                    isset($match['endrange']) ? max(1, (int) $match['endrange']) : 1
+                );
+
+                $chunks[]  = $chunk;
+                $diffLines = [];
+
+                continue;
+            }
+
+            if (preg_match('/^(?P<type>[+ -])?(?P<line>.*)/', $line, $match)) {
+                $type = Line::UNCHANGED;
+
+                if ($match['type'] === '+') {
+                    $type = Line::ADDED;
+                } elseif ($match['type'] === '-') {
+                    $type = Line::REMOVED;
+                }
+
+                $diffLines[] = new Line($type, $match['line']);
+
+                if (null !== $chunk) {
+                    $chunk->setLines($diffLines);
+                }
+            }
+        }
+
+        $diff->setChunks($chunks);
+    }
+}
diff --git a/vendor/sebastian/diff/src/TimeEfficientLongestCommonSubsequenceCalculator.php b/vendor/sebastian/diff/src/TimeEfficientLongestCommonSubsequenceCalculator.php
new file mode 100644
index 000000000..fd19cac76
--- /dev/null
+++ b/vendor/sebastian/diff/src/TimeEfficientLongestCommonSubsequenceCalculator.php
@@ -0,0 +1,70 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use function array_reverse;
+use function count;
+use function max;
+use SplFixedArray;
+
+final class TimeEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function calculate(array $from, array $to): array
+    {
+        $common     = [];
+        $fromLength = count($from);
+        $toLength   = count($to);
+        $width      = $fromLength + 1;
+        $matrix     = new SplFixedArray($width * ($toLength + 1));
+
+        for ($i = 0; $i <= $fromLength; ++$i) {
+            $matrix[$i] = 0;
+        }
+
+        for ($j = 0; $j <= $toLength; ++$j) {
+            $matrix[$j * $width] = 0;
+        }
+
+        for ($i = 1; $i <= $fromLength; ++$i) {
+            for ($j = 1; $j <= $toLength; ++$j) {
+                $o          = ($j * $width) + $i;
+                $matrix[$o] = max(
+                    $matrix[$o - 1],
+                    $matrix[$o - $width],
+                    $from[$i - 1] === $to[$j - 1] ? $matrix[$o - $width - 1] + 1 : 0
+                );
+            }
+        }
+
+        $i = $fromLength;
+        $j = $toLength;
+
+        while ($i > 0 && $j > 0) {
+            if ($from[$i - 1] === $to[$j - 1]) {
+                $common[] = $from[$i - 1];
+                --$i;
+                --$j;
+            } else {
+                $o = ($j * $width) + $i;
+
+                if ($matrix[$o - $width] > $matrix[$o - 1]) {
+                    --$j;
+                } else {
+                    --$i;
+                }
+            }
+        }
+
+        return array_reverse($common);
+    }
+}