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Edit File : Differ.php \| Size : 6.57 KB
<?php declare(strict_types=1); /* * This file is part of sebastian/diff. * * (c) Sebastian Bergmann <sebastian@phpunit.de> * * 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 is_string; use function key; use function min; use function preg_split; use function prev; use function reset; use function str_ends_with; use function substr; use SebastianBergmann\Diff\Output\DiffOutputBuilderInterface; 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; private DiffOutputBuilderInterface $outputBuilder; public function __construct(DiffOutputBuilderInterface $outputBuilder) { $this->outputBuilder = $outputBuilder; } public function diff(array\|string $from, array\|string $to, LongestCommonSubsequenceCalculator $lcs = null): string { $diff = $this->diffToArray($from, $to, $lcs); return $this->outputBuilder->getDiff($diff); } public function diffToArray(array\|string $from, array\|string $to, LongestCommonSubsequenceCalculator $lcs = null): array { if (is_string($from)) { $from = $this->splitStringByLines($from); } if (is_string($to)) { $to = $this->splitStringByLines($to); } [$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; } 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; } private function calculateEstimatedFootprint(array $from, array $to): float\|int { $itemSize = PHP_INT_SIZE === 4 ? 76 : 144; return $itemSize * min(count($from), count($to)) ** 2; } 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" !== $lc) { return ''; } if (str_ends_with($line, "\r\n")) { 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]; } } Back

Edit File : Differ.php | Size : 6.57 KB

<?php declare(strict_types=1);
/*
 * This file is part of sebastian/diff.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * 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 is_string;
use function key;
use function min;
use function preg_split;
use function prev;
use function reset;
use function str_ends_with;
use function substr;
use SebastianBergmann\Diff\Output\DiffOutputBuilderInterface;

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;
    private DiffOutputBuilderInterface $outputBuilder;

public function __construct(DiffOutputBuilderInterface $outputBuilder)
    {
        $this->outputBuilder = $outputBuilder;
    }

public function diff(array|string $from, array|string $to, LongestCommonSubsequenceCalculator $lcs = null): string
    {
        $diff = $this->diffToArray($from, $to, $lcs);

return $this->outputBuilder->getDiff($diff);
    }

public function diffToArray(array|string $from, array|string $to, LongestCommonSubsequenceCalculator $lcs = null): array
    {
        if (is_string($from)) {
            $from = $this->splitStringByLines($from);
        }

if (is_string($to)) {
            $to = $this->splitStringByLines($to);
        }

[$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;
    }

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;
    }

private function calculateEstimatedFootprint(array $from, array $to): float|int
    {
        $itemSize = PHP_INT_SIZE === 4 ? 76 : 144;

return $itemSize * min(count($from), count($to)) ** 2;
    }

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 (str_ends_with($line, "\r\n")) {
            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];
    }
}

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