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vendor/sebastian/diff/src/Parser.php

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+<?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 function array_pop;
+use function assert;
+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;
+                    $collected = [];
+                }
+
+                assert(!empty($fromMatch['file']));
+                assert(!empty($toMatch['file']));
+
+                $diff = new Diff($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, PREG_UNMATCHED_AS_NULL)) {
+                $chunk = new Chunk(
+                    (int) $match['start'],
+                    isset($match['startrange']) ? max(0, (int) $match['startrange']) : 1,
+                    (int) $match['end'],
+                    isset($match['endrange']) ? max(0, (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']);
+
+                $chunk?->setLines($diffLines);
+            }
+        }
+
+        $diff->setChunks($chunks);
+    }
+}