/**
* Computes a diff between sequences of strings.
*
* This can be used to compute things like case-insensitve diffs, or diffs
* which ignore changes in white-space.
*
* @param array $from_lines An array of strings.
* @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 $to_lines.
*/
function mapped_diff(&$from_lines, &$to_lines, &$mapped_from_lines, &$mapped_to_lines)
{
if (sizeof($from_lines) != sizeof($mapped_from_lines) || sizeof($to_lines) != sizeof($mapped_to_lines)) {
return false;
}
parent::diff($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);
}
$final =& $this->_edits[$i]->final;
if (is_array($final)) {
$final = array_slice($to_lines, $yi, sizeof($final));
$yi += sizeof($final);
}
}
}
