home/alospiesjs/www/apis/youtube/vendor/sebastian/diff/src/Differ.php000060400000022344151161276660022015 0ustar00 * * 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, 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]; } }