/**
* Constructor.
*
* Computes 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 $from_lines array An array of strings.
* (Typically these are lines from a file.)
*
* @param $to_lines array An array of strings.
*
* @param $mapped_from_lines array 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 $mapped_to_lines array 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);
}
}
}
