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view core/lib/Drupal/Component/Diff/MappedDiff.php @ 19:fa3358dc1485 tip
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author | Chris Cannam |
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date | Wed, 28 Aug 2019 13:14:47 +0100 |
parents | 4c8ae668cc8c |
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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); } } } }