FM / Internal

/opt/cpanel/ea-wappspector/vendor/nikic/php-parser/lib/PhpParser/Internal/

/opt/cpanel/ea-wappspector/vendor/nikic/php-parser/lib/PhpParser/Internal

Name	Size	Mode	Actions
DiffElem.php	763	0644	edit dl rm
Differ.php	5093	0644	edit dl rm
PrintableNewAnonClassNode.php	2669	0644	edit dl rm
TokenPolyfill.php	9632	0644	edit dl rm
TokenStream.php	9239	0644	edit dl rm

Edit: /opt/cpanel/ea-wappspector/vendor/nikic/php-parser/lib/PhpParser/Internal/Differ.php (5093B)

<?php declare(strict_types=1);

namespace PhpParser\Internal;

/**
 * Implements the Myers diff algorithm.
 *
 * Myers, Eugene W. "An O (ND) difference algorithm and its variations."
 * Algorithmica 1.1 (1986): 251-266.
 *
 * @template T
 * @internal
 */
class Differ {
    /** @var callable(T, T): bool */
    private $isEqual;

/**
     * Create differ over the given equality relation.
     *
     * @param callable(T, T): bool $isEqual Equality relation
     */
    public function __construct(callable $isEqual) {
        $this->isEqual = $isEqual;
    }

/**
     * Calculate diff (edit script) from $old to $new.
     *
     * @param T[] $old Original array
     * @param T[] $new New array
     *
     * @return DiffElem[] Diff (edit script)
     */
    public function diff(array $old, array $new): array {
        $old = \array_values($old);
        $new = \array_values($new);
        list($trace, $x, $y) = $this->calculateTrace($old, $new);
        return $this->extractDiff($trace, $x, $y, $old, $new);
    }

/**
     * Calculate diff, including "replace" operations.
     *
     * If a sequence of remove operations is followed by the same number of add operations, these
     * will be coalesced into replace operations.
     *
     * @param T[] $old Original array
     * @param T[] $new New array
     *
     * @return DiffElem[] Diff (edit script), including replace operations
     */
    public function diffWithReplacements(array $old, array $new): array {
        return $this->coalesceReplacements($this->diff($old, $new));
    }

/**
     * @param T[] $old
     * @param T[] $new
     * @return array{array<int, array<int, int>>, int, int}
     */
    private function calculateTrace(array $old, array $new): array {
        $n = \count($old);
        $m = \count($new);
        $max = $n + $m;
        $v = [1 => 0];
        $trace = [];
        for ($d = 0; $d <= $max; $d++) {
            $trace[] = $v;
            for ($k = -$d; $k <= $d; $k += 2) {
                if ($k === -$d || ($k !== $d && $v[$k - 1] < $v[$k + 1])) {
                    $x = $v[$k + 1];
                } else {
                    $x = $v[$k - 1] + 1;
                }

$y = $x - $k;
                while ($x < $n && $y < $m && ($this->isEqual)($old[$x], $new[$y])) {
                    $x++;
                    $y++;
                }

$v[$k] = $x;
                if ($x >= $n && $y >= $m) {
                    return [$trace, $x, $y];
                }
            }
        }
        throw new \Exception('Should not happen');
    }

/**
     * @param array<int, array<int, int>> $trace
     * @param T[] $old
     * @param T[] $new
     * @return DiffElem[]
     */
    private function extractDiff(array $trace, int $x, int $y, array $old, array $new): array {
        $result = [];
        for ($d = \count($trace) - 1; $d >= 0; $d--) {
            $v = $trace[$d];
            $k = $x - $y;

if ($k === -$d || ($k !== $d && $v[$k - 1] < $v[$k + 1])) {
                $prevK = $k + 1;
            } else {
                $prevK = $k - 1;
            }

$prevX = $v[$prevK];
            $prevY = $prevX - $prevK;

while ($x > $prevX && $y > $prevY) {
                $result[] = new DiffElem(DiffElem::TYPE_KEEP, $old[$x - 1], $new[$y - 1]);
                $x--;
                $y--;
            }

if ($d === 0) {
                break;
            }

while ($x > $prevX) {
                $result[] = new DiffElem(DiffElem::TYPE_REMOVE, $old[$x - 1], null);
                $x--;
            }

while ($y > $prevY) {
                $result[] = new DiffElem(DiffElem::TYPE_ADD, null, $new[$y - 1]);
                $y--;
            }
        }
        return array_reverse($result);
    }

/**
     * Coalesce equal-length sequences of remove+add into a replace operation.
     *
     * @param DiffElem[] $diff
     * @return DiffElem[]
     */
    private function coalesceReplacements(array $diff): array {
        $newDiff = [];
        $c = \count($diff);
        for ($i = 0; $i < $c; $i++) {
            $diffType = $diff[$i]->type;
            if ($diffType !== DiffElem::TYPE_REMOVE) {
                $newDiff[] = $diff[$i];
                continue;
            }

$j = $i;
            while ($j < $c && $diff[$j]->type === DiffElem::TYPE_REMOVE) {
                $j++;
            }

$k = $j;
            while ($k < $c && $diff[$k]->type === DiffElem::TYPE_ADD) {
                $k++;
            }

if ($j - $i === $k - $j) {
                $len = $j - $i;
                for ($n = 0; $n < $len; $n++) {
                    $newDiff[] = new DiffElem(
                        DiffElem::TYPE_REPLACE, $diff[$i + $n]->old, $diff[$j + $n]->new
                    );
                }
            } else {
                for (; $i < $k; $i++) {
                    $newDiff[] = $diff[$i];
                }
            }
            $i = $k - 1;
        }
        return $newDiff;
    }
}

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