1 files changed, 327 insertions, 0 deletions
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];
+    }
+}