function _DiffEngine::_lcs_pos in Diff 7.2

Same name and namespace in other branches

1. 5.2 DiffEngine.php \_DiffEngine::_lcs_pos()
2. 5 DiffEngine.php \_DiffEngine::_lcs_pos()
3. 6.2 DiffEngine.php \_DiffEngine::_lcs_pos()
4. 6 DiffEngine.php \_DiffEngine::_lcs_pos()
5. 7.3 DiffEngine.php \_DiffEngine::_lcs_pos()

1 call to _DiffEngine::_lcs_pos()

_DiffEngine::_diag in ./DiffEngine.php

Divide the Largest Common Subsequence (LCS) of the sequences [XOFF, XLIM) and [YOFF, YLIM) into NCHUNKS approximately equally sized segments.

File

./DiffEngine.php, line 348

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

Class

_DiffEngine

Class used internally by Diff to actually compute the diffs.

Code

function _lcs_pos($ypos) {
  $end = $this->lcs;
  if ($end == 0 || $ypos > $this->seq[$end]) {
    $this->seq[++$this->lcs] = $ypos;
    $this->in_seq[$ypos] = 1;
    return $this->lcs;
  }
  $beg = 1;
  while ($beg < $end) {
    $mid = (int) (($beg + $end) / 2);
    if ($ypos > $this->seq[$mid]) {
      $beg = $mid + 1;
    }
    else {
      $end = $mid;
    }
  }
  USE_ASSERTS && assert($ypos != $this->seq[$end]);
  $this->in_seq[$this->seq[$end]] = FALSE;
  $this->seq[$end] = $ypos;
  $this->in_seq[$ypos] = 1;
  return $end;
}