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- <?php
- namespace Drupal\Component\Diff;
- /**
- * FIXME: bad name.
- * @todo document
- * @private
- * @subpackage DifferenceEngine
- */
- class MappedDiff extends Diff {
- /**
- * Constructor.
- *
- * Computes diff between sequences of strings.
- *
- * This can be used to compute things like
- * case-insensitive diffs, or diffs which ignore
- * changes in white-space.
- *
- * @param array $from_lines
- * An array of strings.
- * (Typically these are lines from a file.)
- * @param array $to_lines
- * An array of strings.
- * @param array $mapped_from_lines
- * This array should have the same size number of elements as $from_lines.
- * The elements in $mapped_from_lines and $mapped_to_lines are what is
- * actually compared when computing the diff.
- * @param array $mapped_to_lines
- * This array should have the same number of elements as $to_lines.
- */
- public function __construct($from_lines, $to_lines, $mapped_from_lines, $mapped_to_lines) {
- assert(sizeof($from_lines) == sizeof($mapped_from_lines));
- assert(sizeof($to_lines) == sizeof($mapped_to_lines));
- parent::__construct($mapped_from_lines, $mapped_to_lines);
- $xi = $yi = 0;
- for ($i = 0; $i < sizeof($this->edits); $i++) {
- $orig = &$this->edits[$i]->orig;
- if (is_array($orig)) {
- $orig = array_slice($from_lines, $xi, sizeof($orig));
- $xi += sizeof($orig);
- }
- $closing = &$this->edits[$i]->closing;
- if (is_array($closing)) {
- $closing = array_slice($to_lines, $yi, sizeof($closing));
- $yi += sizeof($closing);
- }
- }
- }
- }
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