diff options
Diffstat (limited to 'vendor/sebastian/diff/src/Output/UnifiedDiffOutputBuilder.php')
| -rw-r--r-- | vendor/sebastian/diff/src/Output/UnifiedDiffOutputBuilder.php | 272 |
1 files changed, 272 insertions, 0 deletions
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]); + } + } + } +} |