comparison vendor/sebastian/diff/src/Output/UnifiedDiffOutputBuilder.php @ 14:1fec387a4317

Update Drupal core to 8.5.2 via Composer

+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <[e-mail]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SebastianBergmann\Diff\Output;
+
+/**
+ * Builds a diff string representation in unified diff format in chunks.
+ */
+final class UnifiedDiffOutputBuilder extends AbstractChunkOutputBuilder
+{
+    /**
+     * @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");
+            }
+        }
+
+        $this->writeDiffChunked($buffer, $diff, $this->getCommonChunks($diff));
+
+        $diff = \stream_get_contents($buffer, -1, 0);
+
+        \fclose($buffer);
+
+        return $diff;
+    }
+
+    // `old` is an array with key => value pairs . Each pair represents a start and end index of `diff`
+    // of a list of elements all containing `same` (0) entries.
+    private function writeDiffChunked($output, array $diff, array $old)
+    {
+        $upperLimit = \count($diff);
+        $start      = 0;
+        $fromStart  = 0;
+        $toStart    = 0;
+
+        if (\count($old)) { // no common parts, list all diff entries
+            \reset($old);
+
+            // iterate the diff, go from chunk to chunk skipping common chunk of lines between those
+            do {
+                $commonStart = \key($old);
+                $commonEnd   = \current($old);
+
+                if ($commonStart !== $start) {
+                    list($fromRange, $toRange) = $this->getChunkRange($diff, $start, $commonStart);
+                    $this->writeChunk($output, $diff, $start, $commonStart, $fromStart, $fromRange, $toStart, $toRange);
+
+                    $fromStart += $fromRange;
+                    $toStart += $toRange;
+                }
+
+                $start        = $commonEnd + 1;
+                $commonLength = $commonEnd - $commonStart + 1; // calculate number of non-change lines in the common part
+                $fromStart += $commonLength;
+                $toStart += $commonLength;
+            } while (false !== \next($old));
+
+            \end($old); // short cut for finding possible last `change entry`
+            $tmp = \key($old);
+            \reset($old);
+            if ($old[$tmp] === $upperLimit - 1) {
+                $upperLimit = $tmp;
+            }
+        }
+
+        if ($start < $upperLimit - 1) { // check for trailing (non) diff entries
+            do {
+                --$upperLimit;
+            } while (isset($diff[$upperLimit][1]) && $diff[$upperLimit][1] === 0);
+            ++$upperLimit;
+
+            list($fromRange, $toRange) = $this->getChunkRange($diff, $start, $upperLimit);
+            $this->writeChunk($output, $diff, $start, $upperLimit, $fromStart, $fromRange, $toStart, $toRange);
+        }
+    }
+
+    private function writeChunk(
+        $output,
+        array $diff,
+        int $diffStartIndex,
+        int $diffEndIndex,
+        int $fromStart,
+        int $fromRange,
+        int $toStart,
+        int $toRange
+    ) {
+        if ($this->addLineNumbers) {
+            \fwrite($output, '@@ -' . (1 + $fromStart));
+
+            if ($fromRange > 1) {
+                \fwrite($output, ',' . $fromRange);
+            }
+
+            \fwrite($output, ' +' . (1 + $toStart));
+            if ($toRange > 1) {
+                \fwrite($output, ',' . $toRange);
+            }
+
+            \fwrite($output, " @@\n");
+        } else {
+            \fwrite($output, "@@ @@\n");
+        }
+
+        for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
+            if ($diff[$i][1] === 1 /* ADDED */) {
+                \fwrite($output, '+' . $diff[$i][0]);
+            } elseif ($diff[$i][1] === 2 /* REMOVED */) {
+                \fwrite($output, '-' . $diff[$i][0]);
+            } else { /* Not changed (old) 0 or Warning 3 */
+                \fwrite($output, ' ' . $diff[$i][0]);
+            }
+
+            $lc = \substr($diff[$i][0], -1);
+            if ($lc !== "\n" && $lc !== "\r") {
+                \fwrite($output, "\n"); // \No newline at end of file
+            }
+        }
+    }
+
+    private function getChunkRange(array $diff, int $diffStartIndex, int $diffEndIndex): array
+    {
+        $toRange   = 0;
+        $fromRange = 0;
+
+        for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
+            if ($diff[$i][1] === 1) { // added
+                ++$toRange;
+            } elseif ($diff[$i][1] === 2) { // removed
+                ++$fromRange;
+            } elseif ($diff[$i][1] === 0) { // same
+                ++$fromRange;
+                ++$toRange;
+            }
+        }
+
+        return [$fromRange, $toRange];
+    }
+}