function MappedDiff::__construct

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.

Parameters

$from_lines array An array of strings.: Typically these are lines from a file.

$to_lines array An array of strings.:

$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.

$mapped_to_lines array This array should: have the same number of elements as $to_lines.

Overrides Diff::__construct

File

includes/diff.inc, line 795

A PHP diff engine for phpwiki. (Taken from phpwiki-1.3.3)

Class

MappedDiff

@private

Code

function __construct($from_lines, $to_lines, $mapped_from_lines, $mapped_to_lines) {
  assert(count($from_lines) == count($mapped_from_lines));
  assert(count($to_lines) == count($mapped_to_lines));

  parent::__construct($mapped_from_lines, $mapped_to_lines);

  $xi = $yi = 0;
  $editCount = count($this->edits);
  for ($i = 0; $i < $editCount; $i++) {
    $orig = & $this->edits[$i]->orig;
    if (is_array($orig)) {
      $orig = array_slice($from_lines, $xi, count($orig));
      $xi += count($orig);
    }

    $closing = & $this->edits[$i]->closing;
    if (is_array($closing)) {
      $closing = array_slice($to_lines, $yi, count($closing));
      $yi += count($closing);
    }
  }
}