$ec ($[View changes])
\n"; } /** * Text_Diff * * General API for generating and formatting diffs - the differences between * two sequences of strings. * * The PHP diff code used in this package was originally written by Geoffrey * T. Dairiki and is used with his permission. * * $Horde: framework/Text_Diff/Diff.php,v 1.17 2006年02月06日 00:16:09 jan Exp $ * * @package Text_Diff * @author Geoffrey T. Dairiki
* $diff = &new Text_Diff($lines1, $lines2);
* $rev = $diff->reverse();
*
*
* @return Text_Diff A Diff object representing the inverse of the
* original diff. Note that we purposely don't return a
* reference here, since this essentially is a clone()
* method.
*/
function reverse()
{
if (version_compare(zend_version(), '2', '>')) {
$rev = clone($this);
} else {
$rev = $this;
}
$rev->_edits = array();
foreach ($this->_edits as $edit) {
$rev->_edits[] = $edit->reverse();
}
return $rev;
}
/**
* Checks for an empty diff.
*
* @return boolean True if two sequences were identical.
*/
function isEmpty()
{
foreach ($this->_edits as $edit) {
if (!is_a($edit, 'Text_Diff_Op_copy')) {
return false;
}
}
return true;
}
/**
* Computes the length of the Longest Common Subsequence (LCS).
*
* This is mostly for diagnostic purposes.
*
* @return integer The length of the LCS.
*/
function lcs()
{
$lcs = 0;
foreach ($this->_edits as $edit) {
if (is_a($edit, 'Text_Diff_Op_copy')) {
$lcs += count($edit->orig);
}
}
return $lcs;
}
/**
* Gets the original set of lines.
*
* This reconstructs the $from_lines parameter passed to the constructor.
*
* @return array The original sequence of strings.
*/
function getOriginal()
{
$lines = array();
foreach ($this->_edits as $edit) {
if ($edit->orig) {
array_splice($lines, count($lines), 0, $edit->orig);
}
}
return $lines;
}
/**
* Gets the final set of lines.
*
* This reconstructs the $to_lines parameter passed to the constructor.
*
* @return array The sequence of strings.
*/
function getFinal()
{
$lines = array();
foreach ($this->_edits as $edit) {
if ($edit->final) {
array_splice($lines, count($lines), 0, $edit->final);
}
}
return $lines;
}
/**
* Removes trailing newlines from a line of text. This is meant to be used
* with array_walk().
*
* @param string $line The line to trim.
* @param integer $key The index of the line in the array. Not used.
*/
function trimNewlines(&$line, $key)
{
$line = str_replace(array("\n", "\r"), '', $line);
}
/**
* Checks a diff for validity.
*
* This is here only for debugging purposes.
*/
function _check($from_lines, $to_lines)
{
if (serialize($from_lines) != serialize($this->getOriginal())) {
trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
}
if (serialize($to_lines) != serialize($this->getFinal())) {
trigger_error("Reconstructed final doesn't match", E_USER_ERROR);
}
$rev = $this->reverse();
if (serialize($to_lines) != serialize($rev->getOriginal())) {
trigger_error("Reversed original doesn't match", E_USER_ERROR);
}
if (serialize($from_lines) != serialize($rev->getFinal())) {
trigger_error("Reversed final doesn't match", E_USER_ERROR);
}
$prevtype = null;
foreach ($this->_edits as $edit) {
if ($prevtype == get_class($edit)) {
trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
}
$prevtype = get_class($edit);
}
return true;
}
}
/**
* $Horde: framework/Text_Diff/Diff.php,v 1.17 2006年02月06日 00:16:09 jan Exp $
*
* @package Text_Diff
* @author Geoffrey T. Dairiki