+<?php

+/**

+*

+* @package phpBB3

+* @version $Id$

+* @copyright (c) 2006 phpBB Group

+* @license http://opensource.org/licenses/gpl-license.php GNU Public License

+*

+*/

+

+/**

+*/

+if (!defined('IN_PHPBB'))

+{

+ exit;

+}

+

+// Include renderer and engine

+include_once($phpbb_root_path . 'includes/diff/engine.' . $phpEx);

+include_once($phpbb_root_path . 'includes/diff/renderer.' . $phpEx);

+

+/**

+* Code from pear.php.net, Text_Diff-0.2.1 (beta) package

+* http://pear.php.net/package/Text_Diff/

+*

+* Modified by Acyd Burn to meet our coding standards

+* and being able to integrate into phpBB

+*/

+

+/**

+* 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.

+*

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*/

+class diff

+{

+ /**

+ * Array of changes.

+ * @var array

+ */

+ var $_edits;

+

+ /**

+ * Computes diffs between sequences of strings.

+ *

+ * @param array $from_lines An array of strings. Typically these are lines from a file.

+ * @param array $to_lines An array of strings.

+ */

+ function diff($from_lines, $to_lines)

+ {

+ $diff_engine = &new diff_engine();

+ $this->_edits = call_user_func_array(array($diff_engine, 'diff'), array($from_lines, $to_lines));

+ }

+

+ /**

+ * Returns the array of differences.

+ */

+ function get_diff()

+ {

+ return $this->_edits;

+ }

+

+ /**

+ * Computes a reversed diff.

+ *

+ * Example:

+ * <code>

+ * $diff = &new diff($lines1, $lines2);

+ * $rev = $diff->reverse();

+ * </code>

+ *

+ * @return 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 is_empty()

+ {

+ foreach ($this->_edits as $edit)

+ {

+ if (!is_a($edit, '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, 'diff_op_copy'))

+ {

+ $lcs += sizeof($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 get_original()

+ {

+ $lines = array();

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->orig)

+ {

+ array_splice($lines, sizeof($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 get_final()

+ {

+ $lines = array();

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->final)

+ {

+ array_splice($lines, sizeof($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 trim_newlines(&$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->get_original()))

+ {

+ trigger_error("[diff] Reconstructed original doesn't match", E_USER_ERROR);

+ }

+

+ if (serialize($to_lines) != serialize($this->get_final()))

+ {

+ trigger_error("[diff] Reconstructed final doesn't match", E_USER_ERROR);

+ }

+

+ $rev = $this->reverse();

+

+ if (serialize($to_lines) != serialize($rev->get_original()))

+ {

+ trigger_error("[diff] Reversed original doesn't match", E_USER_ERROR);

+ }

+

+ if (serialize($from_lines) != serialize($rev->get_final()))

+ {

+ trigger_error("[diff] Reversed final doesn't match", E_USER_ERROR);

+ }

+

+ $prevtype = null;

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($prevtype == get_class($edit))

+ {

+ trigger_error("[diff] Edit sequence is non-optimal", E_USER_ERROR);

+ }

+ $prevtype = get_class($edit);

+ }

+

+ return true;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*/

+class mapped_diff extends diff

+{

+ /**

+ * 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);

+ }

+ }

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff_op

+{

+ var $orig;

+ var $final;

+

+ function reverse()

+ {

+ trigger_error('[diff] Abstract method', E_USER_ERROR);

+ }

+

+ function norig()

+ {

+ return ($this->orig) ? sizeof($this->orig) : 0;

+ }

+

+ function nfinal()

+ {

+ return ($this->final) ? sizeof($this->final) : 0;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff_op_copy extends diff_op

+{

+ function diff_op_copy($orig, $final = false)

+ {

+ if (!is_array($final))

+ {

+ $final = $orig;

+ }

+ $this->orig = $orig;

+ $this->final = $final;

+ }

+

+ function &reverse()

+ {

+ $reverse = &new diff_op_copy($this->final, $this->orig);

+ return $reverse;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff_op_delete extends diff_op

+{

+ function diff_op_delete($lines)

+ {

+ $this->orig = $lines;

+ $this->final = false;

+ }

+

+ function &reverse()

+ {

+ $reverse = &new diff_op_add($this->orig);

+ return $reverse;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff_op_add extends diff_op

+{

+ function diff_op_add($lines)

+ {

+ $this->final = $lines;

+ $this->orig = false;

+ }

+

+ function &reverse()

+ {

+ $reverse = &new diff_op_delete($this->final);

+ return $reverse;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff_op_change extends diff_op

+{

+ function diff_op_change($orig, $final)

+ {

+ $this->orig = $orig;

+ $this->final = $final;

+ }

+

+ function &reverse()

+ {

+ $reverse = &new diff_op_change($this->final, $this->orig);

+ return $reverse;

+ }

+}

+

+

+/**

+* A class for computing three way diffs.

+*

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*/

+class diff3 extends diff

+{

+ /**

+ * Conflict counter.

+ * @var integer

+ */

+ var $_conflicting_blocks = 0;

+

+ /**

+ * Computes diff between 3 sequences of strings.

+ *

+ * @param array $orig The original lines to use.

+ * @param array $final1 The first version to compare to.

+ * @param array $final2 The second version to compare to.

+ */

+ function diff3($orig, $final1, $final2)

+ {

+ $engine = new diff_engine();

+ $this->_edits = $this->_diff3($engine->diff($orig, $final1), $engine->diff($orig, $final2));

+ }

+

+ /**

+ * Return merged output

+ *

+ * @param string $label1 the cvs file version/label from the original set of lines

+ * @param string $label2 the cvs file version/label from the new set of lines

+ * @param bool $get_conflicts if set to true only the number of conflicts is returned

+ * @param bool $merge_new if set to true the merged output will have the new file contents on a conflicting merge

+ *

+ * @return mixed the merged output

+ */

+ function merged_output($label1 = 'CURRENT_FILE', $label2 = 'NEW_FILE', $get_conflicts = false, $merge_new = false)

+ {

+ global $user;

+

+ if ($get_conflicts)

+ {

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->is_conflict())

+ {

+ $this->_conflicting_blocks++;

+ }

+ }

+

+ return $this->_conflicting_blocks;

+ }

+

+ $label1 = (!empty($user->lang[$label1])) ? $user->lang[$label1] : $label1;

+ $label2 = (!empty($user->lang[$label2])) ? $user->lang[$label2] : $label2;

+

+ $lines = array();

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->is_conflict())

+ {

+ if (!$merge_new)

+ {

+ $lines = array_merge($lines, array('<<<<<<<' . ($label1 ? ' ' . $label1 : '')), $edit->final1, array('======='), $edit->final2, array('>>>>>>>' . ($label2 ? ' ' . $label2 : '')));

+ }

+ else

+ {

+ $lines = array_merge($lines, $edit->final1);

+ }

+ $this->_conflicting_blocks++;

+ }

+ else

+ {

+ $lines = array_merge($lines, $edit->merged());

+ }

+ }

+

+ return $lines;

+ }

+

+ /**

+ * Merge the output and use the new file code for conflicts

+ */

+ function merged_new_output()

+ {

+ $lines = array();

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->is_conflict())

+ {

+ $lines = array_merge($lines, $edit->final2);

+ }

+ else

+ {

+ $lines = array_merge($lines, $edit->merged());

+ }

+ }

+

+ return $lines;

+ }

+

+ /**

+ * Merge the output and use the original file code for conflicts

+ */

+ function merged_orig_output()

+ {

+ $lines = array();

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->is_conflict())

+ {

+ $lines = array_merge($lines, $edit->final1);

+ }

+ else

+ {

+ $lines = array_merge($lines, $edit->merged());

+ }

+ }

+

+ return $lines;

+ }

+

+ /**

+ * Get conflicting block(s)

+ */

+ function get_conflicts()

+ {

+ $conflicts = array();

+

+ foreach ($this->_edits as $edit)

+ {

+ if ($edit->is_conflict())

+ {

+ $conflicts[] = array($edit->final1, $edit->final2);

+ }

+ }

+

+ return $conflicts;

+ }

+

+ /**

+ * @access private

+ */

+ function _diff3($edits1, $edits2)

+ {

+ $edits = array();

+ $bb = &new diff3_block_builder();

+

+ $e1 = current($edits1);

+ $e2 = current($edits2);

+

+ while ($e1 || $e2)

+ {

+ if ($e1 && $e2 && is_a($e1, 'diff_op_copy') && is_a($e2, 'diff_op_copy'))

+ {

+ // We have copy blocks from both diffs. This is the (only) time we want to emit a diff3 copy block.

+ // Flush current diff3 diff block, if any.

+ if ($edit = $bb->finish())

+ {

+ $edits[] = $edit;

+ }

+

+ $ncopy = min($e1->norig(), $e2->norig());

+ $edits[] = &new diff3_op_copy(array_slice($e1->orig, 0, $ncopy));

+

+ if ($e1->norig() > $ncopy)

+ {

+ array_splice($e1->orig, 0, $ncopy);

+ array_splice($e1->final, 0, $ncopy);

+ }

+ else

+ {

+ $e1 = next($edits1);

+ }

+

+ if ($e2->norig() > $ncopy)

+ {

+ array_splice($e2->orig, 0, $ncopy);

+ array_splice($e2->final, 0, $ncopy);

+ }

+ else

+ {

+ $e2 = next($edits2);

+ }

+ }

+ else

+ {

+ if ($e1 && $e2)

+ {

+ if ($e1->orig && $e2->orig)

+ {

+ $norig = min($e1->norig(), $e2->norig());

+ $orig = array_splice($e1->orig, 0, $norig);

+ array_splice($e2->orig, 0, $norig);

+ $bb->input($orig);

+ }

+ else

+ {

+ $norig = 0;

+ }

+

+ if (is_a($e1, 'diff_op_copy'))

+ {

+ $bb->out1(array_splice($e1->final, 0, $norig));

+ }

+

+ if (is_a($e2, 'diff_op_copy'))

+ {

+ $bb->out2(array_splice($e2->final, 0, $norig));

+ }

+ }

+

+ if ($e1 && ! $e1->orig)

+ {

+ $bb->out1($e1->final);

+ $e1 = next($edits1);

+ }

+

+ if ($e2 && ! $e2->orig)

+ {

+ $bb->out2($e2->final);

+ $e2 = next($edits2);

+ }

+ }

+ }

+

+ if ($edit = $bb->finish())

+ {

+ $edits[] = $edit;

+ }

+

+ return $edits;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff3_op

+{

+ function diff3_op($orig = false, $final1 = false, $final2 = false)

+ {

+ $this->orig = $orig ? $orig : array();

+ $this->final1 = $final1 ? $final1 : array();

+ $this->final2 = $final2 ? $final2 : array();

+ }

+

+ function merged()

+ {

+ if (!isset($this->_merged))

+ {

+ if ($this->final1 === $this->final2)

+ {

+ $this->_merged = &$this->final1;

+ }

+ else if ($this->final1 === $this->orig)

+ {

+ $this->_merged = &$this->final2;

+ }

+ else if ($this->final2 === $this->orig)

+ {

+ $this->_merged = &$this->final1;

+ }

+ else

+ {

+ $this->_merged = false;

+ }

+ }

+

+ return $this->_merged;

+ }

+

+ function is_conflict()

+ {

+ return ($this->merged() === false) ? true : false;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff3_op_copy extends diff3_op

+{

+ function diff3_op_copy($lines = false)

+ {

+ $this->orig = $lines ? $lines : array();

+ $this->final1 = &$this->orig;

+ $this->final2 = &$this->orig;

+ }

+

+ function merged()

+ {

+ return $this->orig;

+ }

+

+ function is_conflict()

+ {

+ return false;

+ }

+}

+

+/**

+* @package phpBB3

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+*

+* @access private

+*/

+class diff3_block_builder

+{

+ function diff3_block_builder()

+ {

+ $this->_init();

+ }

+

+ function input($lines)

+ {

+ if ($lines)

+ {

+ $this->_append($this->orig, $lines);

+ }

+ }

+

+ function out1($lines)

+ {

+ if ($lines)

+ {

+ $this->_append($this->final1, $lines);

+ }

+ }

+

+ function out2($lines)

+ {

+ if ($lines)

+ {

+ $this->_append($this->final2, $lines);

+ }

+ }

+

+ function is_empty()

+ {

+ return !$this->orig && !$this->final1 && !$this->final2;

+ }

+

+ function finish()

+ {

+ if ($this->is_empty())

+ {

+ return false;

+ }

+ else

+ {

+ $edit = &new diff3_op($this->orig, $this->final1, $this->final2);

+ $this->_init();

+ return $edit;

+ }

+ }

+

+ function _init()

+ {

+ $this->orig = $this->final1 = $this->final2 = array();

+ }

+

+ function _append(&$array, $lines)

+ {

+ array_splice($array, sizeof($array), 0, $lines);

+ }

+}

+

+?> \ No newline at end of file

+<?php

+/**

+*

+* @package phpBB3

+* @version $Id$

+* @copyright (c) 2006 phpBB Group

+* @license http://opensource.org/licenses/gpl-license.php GNU Public License

+*

+*/

+

+/**

+*/

+if (!defined('IN_PHPBB'))

+{

+ exit;

+}

+

+/**

+* Code from pear.php.net, Text_Diff-0.2.1 (beta) package

+* http://pear.php.net/package/Text_Diff/

+*

+* Modified by Acyd Burn to meet our coding standards

+* and being able to integrate into phpBB

+*/

+

+/**

+* Class used internally by Diff to actually compute the diffs. This class is

+* implemented using native PHP code.

+*

+* The algorithm used here is mostly lifted from the perl module

+* Algorithm::Diff (version 1.06) by Ned Konz, which is available at:

+* http://www.perl.com/CPAN/authors/id/N/NE/NEDKONZ/Algorithm-Diff-1.06.zip

+*

+* More ideas are taken from:

+* http://www.ics.uci.edu/~eppstein/161/960229.html

+*

+* Some ideas (and a bit of code) are taken from analyze.c, of GNU

+* diffutils-2.7, which can be found at:

+* ftp://gnudist.gnu.org/pub/gnu/diffutils/diffutils-2.7.tar.gz

+*

+* Some ideas (subdivision by NCHUNKS > 2, and some optimizations) are from

+* Geoffrey T. Dairiki <dairiki@dairiki.org>. The original PHP version of this

+* code was written by him, and is used/adapted with his permission.

+*

+* @author Geoffrey T. Dairiki <dairiki@dairiki.org>

+* @package phpBB3

+*

+* @access private

+*/

+class diff_engine

+{

+ function diff($from_lines, $to_lines)

+ {

+ array_walk($from_lines, array('diff', 'trim_newlines'));

+ array_walk($to_lines, array('diff', 'trim_newlines'));

+

+ $n_from = sizeof($from_lines);

+ $n_to = sizeof($to_lines);

+

+ $this->xchanged = $this->ychanged = $this->xv = $this->yv = $this->xind = $this->yind = array();

+ unset($this->seq, $this->in_seq, $this->lcs);

+

+ // Skip leading common lines.

+ for ($skip = 0; $skip < $n_from && $skip < $n_to; $skip++)

+ {

+ if ($from_lines[$skip] !== $to_lines[$skip])

+ {

+ break;

+ }

+ $this->xchanged[$skip] = $this->ychanged[$skip] = false;

+ }

+

+ // Skip trailing common lines.

+ $xi = $n_from;

+ $yi = $n_to;

+

+ for ($endskip = 0; --$xi > $skip && --$yi > $skip; $endskip++)

+ {

+ if ($from_lines[$xi] !== $to_lines[$yi])

+ {

+ break;

+ }

+ $this->xchanged[$xi] = $this->ychanged[$yi] = false;

+ }

+

+ // Ignore lines which do not exist in both files.

+ for ($xi = $skip; $xi < $n_from - $endskip; $xi++)

+ {

+ $xhash[$from_lines[$xi]] = 1;

+ }

+

+ for ($yi = $skip; $yi < $n_to - $endskip; $yi++)

+ {

+ $line = $to_lines[$yi];

+

+ if (($this->ychanged[$yi] = empty($xhash[$line])))

+ {

+ continue;

+ }

+ $yhash[$line] = 1;

+ $this->yv[] = $line;

+ $this->yind[] = $yi;

+ }

+

+ for ($xi = $skip; $xi < $n_from - $endskip; $xi++)

+ {

+ $line = $from_lines[$xi];

+

+ if (($this->xchanged[$xi] = empty($yhash[$line])))

+ {

+ continue;

+ }

+ $this->xv[] = $line;

+ $this->xind[] = $xi;

+ }

+

+ // Find the LCS.

+ $this->_compareseq(0, sizeof($this->xv), 0, sizeof($this->yv));

+

+ // Merge edits when possible.

+ $this->_shift_boundaries($from_lines, $this->xchanged, $this->ychanged);

+ $this->_shift_boundaries($to_lines, $this->ychanged, $this->xchanged);

+

+ // Compute the edit operations.

+ $edits = array();

+ $xi = $yi = 0;

+

+ while ($xi < $n_from || $yi < $n_to)

+ {

+ // Skip matching "snake".

+ $copy = array();

+

+ while ($xi < $n_from && $yi < $n_to && !$this->xchanged[$xi] && !$this->ychanged[$yi])

+ {

+ $copy[] = $from_lines[$xi++];

+ $yi++;

+ }

+

+ if ($copy)

+ {

+ $edits[] = &new diff_op_copy($copy);

+ }

+

+ // Find deletes & adds.

+ $delete = array();

+ while ($xi < $n_from && $this->xchanged[$xi])

+ {

+ $delete[] = $from_lines[$xi++];

+ }

+

+ $add = array();

+ while ($yi < $n_to && $this->ychanged[$yi])

+ {

+ $add[] = $to_lines[$yi++];

+ }

+

+ if ($delete && $add)

+ {

+ $edits[] = &new diff_op_change($delete, $add);

+ }

+ else if ($delete)

+ {

+ $edits[] = &new diff_op_delete($delete);

+ }

+ else if ($add)

+ {

+ $edits[] = &new diff_op_add($add);

+ }

+ }

+

+ return $edits;

+ }

+

+ /**

+ * Divides the Largest Common Subsequence (LCS) of the sequences (XOFF,

+ * XLIM) and (YOFF, YLIM) into NCHUNKS approximately equally sized segments.

+ *

+ * Returns (LCS, PTS). LCS is the length of the LCS. PTS is an array of

+ * NCHUNKS+1 (X, Y) indexes giving the diving points between sub

+ * sequences. The first sub-sequence is contained in (X0, X1), (Y0, Y1),

+ * the second in (X1, X2), (Y1, Y2) and so on. Note that (X0, Y0) ==

+ * (XOFF, YOFF) and (X[NCHUNKS], Y[NCHUNKS]) == (XLIM, YLIM).

+ *

+ * This function assumes that the first lines of the specified portions of

+ * the two files do not match, and likewise that the last lines do not

+ * match. The caller must trim matching lines from the beginning and end

+ * of the portions it is going to specify.

+ */

+ function _diag($xoff, $xlim, $yoff, $ylim, $nchunks)

+ {

+ $flip = false;

+

+ if ($xlim - $xoff > $ylim - $yoff)

+ {

+ // Things seems faster (I'm not sure I understand why) when the shortest sequence is in X.

+ $flip = true;

+ list($xoff, $xlim, $yoff, $ylim) = array($yoff, $ylim, $xoff, $xlim);

+ }

+

+ if ($flip)

+ {

+ for ($i = $ylim - 1; $i >= $yoff; $i--)

+ {

+ $ymatches[$this->xv[$i]][] = $i;

+ }

+ }

+ else

+ {

+ for ($i = $ylim - 1; $i >= $yoff; $i--)

+ {

+ $ymatches[$this->yv[$i]][] = $i;

+ }

+ }

+

+ $this->lcs = 0;

+ $this->seq[0]= $yoff - 1;

+ $this->in_seq = array();

+ $ymids[0] = array();

+

+ $numer = $xlim - $xoff + $nchunks - 1;

+ $x = $xoff;

+

+ for ($chunk = 0; $chunk < $nchunks; $chunk++)

+ {

+ if ($chunk > 0)

+ {

+ for ($i = 0; $i <= $this->lcs; $i++)

+ {

+ $ymids[$i][$chunk - 1] = $this->seq[$i];

+ }

+ }

+

+ $x1 = $xoff + (int)(($numer + ($xlim-$xoff)*$chunk) / $nchunks);

+

+ for (; $x < $x1; $x++)

+ {

+ $line = $flip ? $this->yv[$x] : $this->xv[$x];

+ if (empty($ymatches[$line]))

+ {

+ continue;

+ }

+ $matches = $ymatches[$line];

+

+ foreach ($matches as $y)

+ {

+ if (empty($this->in_seq[$y]))

+ {

+ $k = $this->_lcs_pos($y);

+ $ymids[$k] = $ymids[$k - 1];

+ break;

+ }

+ }

+

+ while (list($junk, $y) = each($matches))

+ {

+ if ($y > $this->seq[$k - 1])

+ {

+ // Optimization: this is a common case: next match is just replacing previous match.

+ $this->in_seq[$this->seq[$k]] = false;

+ $this->seq[$k] = $y;

+ $this->in_seq[$y] = 1;

+ }

+ else if (empty($this->in_seq[$y]))

+ {

+ $k = $this->_lcs_pos($y);

+ $ymids[$k] = $ymids[$k - 1];

+ }

+ }

+ }

+ }

+

+ $seps[] = $flip ? array($yoff, $xoff) : array($xoff, $yoff);

+ $ymid = $ymids[$this->lcs];

+

+ for ($n = 0; $n < $nchunks - 1; $n++)

+ {

+ $x1 = $xoff + (int)(($numer + ($xlim - $xoff) * $n) / $nchunks);

+ $y1 = $ymid[$n] + 1;

+ $seps[] = $flip ? array($y1, $x1) : array($x1, $y1);

+ }

+ $seps[] = $flip ? array($ylim, $xlim) : array($xlim, $ylim);

+

+ return array($this->lcs, $seps);

+ }

+

+ 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;

+ }

+ }

+

+ $this->in_seq[$this->seq[$end]] = false;

+ $this->seq[$end] = $ypos;

+ $this->in_seq[$ypos] = 1;

+

+ return $end;

+ }

+

+ /**

+ * Finds LCS of two sequences.

+ *

+ * The results are recorded in the vectors $this->{x,y}changed[], by

+ * storing a 1 in the element for each line that is an insertion or

+ * deletion (ie. is not in the LCS).

+ *

+ * The subsequence of file 0 is (XOFF, XLIM) and likewise for file 1.

+ *

+ * Note that XLIM, YLIM are exclusive bounds. All line numbers are

+ * origin-0 and discarded lines are not counted.

+ */

+ function _compareseq($xoff, $xlim, $yoff, $ylim)

+ {

+ // Slide down the bottom initial diagonal.

+ while ($xoff < $xlim && $yoff < $ylim && $this->xv[$xoff] == $this->yv[$yoff])

+ {

+ ++$xoff;

+ ++$yoff;

+ }

+

+ // Slide up the top initial diagonal.

+ while ($xlim > $xoff && $ylim > $yoff && $this->xv[$xlim - 1] == $this->yv[$ylim - 1])

+ {

+ --$xlim;

+ --$ylim;

+ }

+

+ if ($xoff == $xlim || $yoff == $ylim)

+ {

+ $lcs = 0;

+ }

+ else

+ {

+ // This is ad hoc but seems to work well.

+ // $nchunks = sqrt(min($xlim - $xoff, $ylim - $yoff) / 2.5);

+ // $nchunks = max(2,min(8,(int)$nchunks));

+ $nchunks = min(7, $xlim - $xoff, $ylim - $yoff) + 1;

+ list($lcs, $seps) = $this->_diag($xoff, $xlim, $yoff, $ylim, $nchunks);

+ }

+

+ if ($lcs == 0)

+ {

+ // X and Y sequences have no common subsequence: mark all changed.

+ while ($yoff < $ylim)

+ {

+ $this->ychanged[$this->yind[$yoff++]] = 1;

+ }

+

+ while ($xoff < $xlim)

+ {

+ $this->xchanged[$this->xind[$xoff++]] = 1;

+ }

+ }

+ else

+ {

+ // Use the partitions to split this problem into subproblems.

+ reset($seps);

+ $pt1 = $seps[0];

+

+ while ($pt2 = next($seps))

+ {

+ $this->_compareseq($pt1[0], $pt2[0], $pt1[1], $pt2[1]);

+ $pt1 = $pt2;

+ }

+ }

+ }

+

+ /**

+ * Adjusts inserts/deletes of identical lines to join changes as much as possible.

+ *

+ * We do something when a run of changed lines include a line at one end

+ * and has an excluded, identical line at the other. We are free to

+ * choose which identical line is included. 'compareseq' usually chooses

+ * the one at the beginning, but usually it is cleaner to consider the

+ * following identical line to be the "change".

+ *

+ * This is extracted verbatim from analyze.c (GNU diffutils-2.7).

+ */

+ function _shift_boundaries($lines, &$changed, $other_changed)

+ {

+ $i = 0;

+ $j = 0;

+

+ $len = sizeof($lines);

+ $other_len = sizeof($other_changed);

+

+ while (1)

+ {

+ // Scan forward to find the beginning of another run of

+ // changes. Also keep track of the corresponding point in the other file.

+ //

+ // Throughout this code, $i and $j are adjusted together so that

+ // the first $i elements of $changed and the first $j elements of

+ // $other_changed both contain the same number of zeros (unchanged lines).

+ //

+ // Furthermore, $j is always kept so that $j == $other_len or $other_changed[$j] == false.

+ while ($j < $other_len && $other_changed[$j])

+ {

+ $j++;

+ }

+

+ while ($i < $len && ! $changed[$i])

+ {

+ $i++;

+ $j++;

+

+ while ($j < $other_len && $other_changed[$j])

+ {

+ $j++;

+ }

+ }

+

+ if ($i == $len)

+ {

+ break;

+ }

+

+ $start = $i;

+

+ // Find the end of this run of changes.

+ while (++$i < $len && $changed[$i])

+ {

+ continue;

+ }

+

+ do

+ {

+ // Record the length of this run of changes, so that we can later determine whether the run has grown.

+ $runlength = $i - $start;

+

+ // Move the changed region back, so long as the previous unchanged line matches the last changed one.

+ // This merges with previous changed regions.

+ while ($start > 0 && $lines[$start - 1] == $lines[$i - 1])

+ {

+ $changed[--$start] = 1;

+ $changed[--$i] = false;

+

+ while ($start > 0 && $changed[$start - 1])

+ {

+ $start--;

+ }

+

+ while ($other_changed[--$j])

+ {

+ continue;

+ }

+ }

+

+ // Set CORRESPONDING to the end of the changed run, at the last point where it corresponds to a changed run in the

+ // other file. CORRESPONDING == LEN means no such point has been found.

+ $corresponding = $j < $other_len ? $i : $len;

+

+ // Move the changed region forward, so long as the first changed line matches the following unchanged one.

+ // This merges with following changed regions.

+ // Do this second, so that if there are no merges, the changed region is moved forward as far as possible.

+ while ($i < $len && $lines[$start] == $lines[$i])

+ {

+ $changed[$start++] = false;

+ $changed[$i++] = 1;

+

+ while ($i < $len && $changed[$i])

+ {

+ $i++;

+ }

+

+ $j++;

+ if ($j < $other_len && $other_changed[$j])

+ {

+ $corresponding = $i;

+ while ($j < $other_len && $other_changed[$j])

+ {

+ $j++;

+ }

+ }

+ }

+ }

+ while ($runlength != $i - $start);

+

+ // If possible, move the fully-merged run of changes back to a corresponding run in the other file.

+ while ($corresponding < $i)

+ {

+ $changed[--$start] = 1;

+ $changed[--$i] = 0;

+

+ while ($other_changed[--$j])

+ {

+ continue;

+ }

+ }

+ }

+ }

+}

+

+?> \ No newline at end of file

+<?php

+/**

+*

+* @package phpBB3

+* @version $Id$

+* @copyright (c) 2006 phpBB Group

+* @license http://opensource.org/licenses/gpl-license.php GNU Public License

+*

+*/

+

+/**

+*/

+if (!defined('IN_PHPBB'))

+{

+ exit;

+}

+

+/**

+* Code from pear.php.net, Text_Diff-0.2.1 (beta) package

+* http://pear.php.net/package/Text_Diff/

+*

+* Modified by Acyd Burn to meet our coding standards

+* and being able to integrate into phpBB

+*/

+

+/**

+* A class to render Diffs in different formats.

+*

+* This class renders the diff in classic diff format. It is intended that

+* this class be customized via inheritance, to obtain fancier outputs.

+*

+* @package phpBB3

+*/

+class diff_renderer

+{

+ /**

+ * Number of leading context "lines" to preserve.

+ *

+ * This should be left at zero for this class, but subclasses may want to

+ * set this to other values.

+ */

+ var $_leading_context_lines = 0;

+

+ /**

+ * Number of trailing context "lines" to preserve.

+ *

+ * This should be left at zero for this class, but subclasses may want to

+ * set this to other values.

+ */

+ var $_trailing_context_lines = 0;

+

+ /**

+ * Constructor.

+ */

+ function diff_renderer($params = array())

+ {

+ foreach ($params as $param => $value)

+ {

+ $v = '_' . $param;

+ if (isset($this->$v))

+ {

+ $this->$v = $value;

+ }

+ }

+ }

+

+ /**

+ * Get any renderer parameters.

+ *

+ * @return array All parameters of this renderer object.

+ */

+ function get_params()

+ {

+ $params = array();

+ foreach (get_object_vars($this) as $k => $v)

+ {

+ if ($k[0] == '_')

+ {

+ $params[substr($k, 1)] = $v;

+ }

+ }

+

+ return $params;

+ }

+

+ /**

+ * Renders a diff.

+ *

+ * @param diff $diff A diff object.

+ *

+ * @return string The formatted output.

+ */

+ function render(&$diff)

+ {

+ $xi = $yi = 1;

+ $block = false;

+ $context = array();

+

+ // Create a new diff object if it is a 3-way diff

+ if (is_a($diff, 'diff3'))

+ {

+ $diff3 = &$diff;

+ $diff = &new diff($diff3->get_original(), $diff3->merged_output());

+ unset($diff3);

+ }

+

+ $nlead = $this->_leading_context_lines;

+ $ntrail = $this->_trailing_context_lines;

+

+ $output = $this->_start_diff();

+ $diffs = $diff->get_diff();

+

+ foreach ($diffs as $i => $edit)

+ {

+ if (is_a($edit, 'diff_op_copy'))

+ {

+ if (is_array($block))

+ {

+ $keep = ($i == sizeof($diffs) - 1) ? $ntrail : $nlead + $ntrail;

+ if (sizeof($edit->orig) <= $keep)

+ {

+ $block[] = $edit;

+ }

+ else

+ {

+ if ($ntrail)

+ {

+ $context = array_slice($edit->orig, 0, $ntrail);

+ $block[] = &new diff_op_copy($context);

+ }

+

+ $output .= $this->_block($x0, $ntrail + $xi - $x0, $y0, $ntrail + $yi - $y0, $block);

+ $block = false;

+ }

+ }

+ $context = $edit->orig;

+ }

+ else

+ {

+ if (!is_array($block))

+ {

+ $context = array_slice($context, sizeof($context) - $nlead);

+ $x0 = $xi - sizeof($context);

+ $y0 = $yi - sizeof($context);

+ $block = array();

+

+ if ($context)

+ {

+ $block[] = &new diff_op_copy($context);

+ }

+ }

+ $block[] = $edit;

+ }

+

+ $xi += ($edit->orig) ? sizeof($edit->orig) : 0;

+ $yi += ($edit->final) ? sizeof($edit->final) : 0;

+ }

+

+ if (is_array($block))

+ {

+ $output .= $this->_block($x0, $xi - $x0, $y0, $yi - $y0, $block);

+ }

+

+ return $output . $this->_end_diff();

+ }

+

+ function _block($xbeg, $xlen, $ybeg, $ylen, &$edits)

+ {

+ $output = $this->_start_block($this->_block_header($xbeg, $xlen, $ybeg, $ylen));

+

+ foreach ($edits as $edit)

+ {

+ switch (get_class($edit))

+ {

+ case 'diff_op_copy':

+ $output .= $this->_context($edit->orig);

+ break;

+

+ case 'diff_op_add':

+ $output .= $this->_added($edit->final);

+ break;

+

+ case 'diff_op_delete':

+ $output .= $this->_deleted($edit->orig);

+ break;

+

+ case 'diff_op_change':

+ $output .= $this->_changed($edit->orig, $edit->final);

+ break;

+ }

+ }

+

+ return $output . $this->_end_block();

+ }

+

+ function _start_diff()

+ {

+ return '';

+ }

+

+ function _end_diff()

+ {

+ return '';

+ }

+

+ function _block_header($xbeg, $xlen, $ybeg, $ylen)

+ {

+ if ($xlen > 1)

+ {

+ $xbeg .= ',' . ($xbeg + $xlen - 1);

+ }

+

+ if ($ylen > 1)

+ {

+ $ybeg .= ',' . ($ybeg + $ylen - 1);

+ }

+

+ return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;

+ }

+

+ function _start_block($header)

+ {

+ return $header . "\n";

+ }

+

+ function _end_block()

+ {

+ return '';

+ }

+

+ function _lines($lines, $prefix = ' ')

+ {

+ return $prefix . implode("\n$prefix", $lines) . "\n";

+ }

+

+ function _context($lines)

+ {

+ return $this->_lines($lines, ' ');

+ }

+

+ function _added($lines)

+ {

+ return $this->_lines($lines, '> ');

+ }

+

+ function _deleted($lines)

+ {

+ return $this->_lines($lines, '< ');

+ }

+

+ function _changed($orig, $final)

+ {

+ return $this->_deleted($orig) . "---\n" . $this->_added($final);

+ }

+

+ /**

+ * Our function to get the diff

+ */

+ function get_diff_content($diff)

+ {

+ return $this->render($diff);

+ }

+}

+

+/**

+* Renders a unified diff

+* @package phpBB3

+*/

+class diff_renderer_unified extends diff_renderer

+{

+ var $_leading_context_lines = 4;

+ var $_trailing_context_lines = 4;

+

+ /**

+ * Our function to get the diff

+ */

+ function get_diff_content($diff)

+ {

+ return nl2br($this->render($diff));

+ }

+

+ function _block_header($xbeg, $xlen, $ybeg, $ylen)

+ {

+ if ($xlen != 1)

+ {

+ $xbeg .= ',' . $xlen;

+ }

+

+ if ($ylen != 1)

+ {

+ $ybeg .= ',' . $ylen;

+ }

+ return '<div class="diff"><big class="info">@@ -' . $xbeg . ' +' . $ybeg . ' @@</big></div>';

+ }

+

+ function _context($lines)

+ {

+ return '<pre class="diff context">' . htmlspecialchars($this->_lines($lines, ' ')) . '</pre>';

+ }

+

+ function _added($lines)

+ {

+ return '<pre class="diff added">' . htmlspecialchars($this->_lines($lines, '+')) . '</pre>';

+ }

+

+ function _deleted($lines)

+ {

+ return '<pre class="diff removed">' . htmlspecialchars($this->_lines($lines, '-')) . '</pre>';

+ }

+

+ function _changed($orig, $final)

+ {

+ return $this->_deleted($orig) . $this->_added($final);

+ }

+

+ function _start_diff()

+ {

+ $start = '<div class="file">';

+

+ return $start;

+ }

+

+ function _end_diff()

+ {

+ return '</div>';

+ }

+

+ function _end_block()

+ {

+ return '';

+ }

+}

+

+/**

+* "Inline" diff renderer.

+*

+* This class renders diffs in the Wiki-style "inline" format.

+*

+* @author Ciprian Popovici

+* @package phpBB3

+*/

+class diff_renderer_inline extends diff_renderer

+{

+ var $_leading_context_lines = 10000;

+ var $_trailing_context_lines = 10000;

+

+ // Prefix and suffix for inserted text

+ var $_ins_prefix = '<span class="ins">';

+ var $_ins_suffix = '</span>';

+

+ // Prefix and suffix for deleted text

+ var $_del_prefix = '<span class="del">';

+ var $_del_suffix = '</span>';

+

+ var $_block_head = '';

+

+ // What are we currently splitting on? Used to recurse to show word-level

+ var $_split_level = 'lines';

+

+ /**

+ * Our function to get the diff

+ */

+ function get_diff_content($diff)

+ {

+ return '<pre>' . nl2br($this->render($diff)) . '</pre>';

+ }

+

+ function _start_diff()

+ {

+ return '';

+ }

+

+ function _end_diff()

+ {

+ return '';

+ }

+

+ function _block_header($xbeg, $xlen, $ybeg, $ylen)

+ {

+ return $this->_block_head;

+ }

+

+ function _start_block($header)

+ {

+ return $header;

+ }

+

+ function _lines($lines, $prefix = ' ', $encode = true)

+ {

+ if ($encode)

+ {

+ array_walk($lines, array(&$this, '_encode'));

+ }

+

+ if ($this->_split_level == 'words')

+ {

+ return implode('', $lines);

+ }

+ else

+ {

+ return implode("\n", $lines) . "\n";

+ }

+ }

+

+ function _added($lines)

+ {

+ array_walk($lines, array(&$this, '_encode'));

+ $lines[0] = $this->_ins_prefix . $lines[0];

+ $lines[sizeof($lines) - 1] .= $this->_ins_suffix;

+ return $this->_lines($lines, ' ', false);

+ }

+

+ function _deleted($lines, $words = false)

+ {

+ array_walk($lines, array(&$this, '_encode'));

+ $lines[0] = $this->_del_prefix . $lines[0];

+ $lines[sizeof($lines) - 1] .= $this->_del_suffix;

+ return $this->_lines($lines, ' ', false);

+ }

+

+ function _changed($orig, $final)

+ {

+ // If we've already split on words, don't try to do so again - just display.

+ if ($this->_split_level == 'words')

+ {

+ $prefix = '';

+ while ($orig[0] !== false && $final[0] !== false && substr($orig[0], 0, 1) == ' ' && substr($final[0], 0, 1) == ' ')

+ {

+ $prefix .= substr($orig[0], 0, 1);

+ $orig[0] = substr($orig[0], 1);

+ $final[0] = substr($final[0], 1);

+ }

+

+ return $prefix . $this->_deleted($orig) . $this->_added($final);

+ }

+

+ $text1 = implode("\n", $orig);

+ $text2 = implode("\n", $final);

+

+ // Non-printing newline marker.

+ $nl = "\0";

+

+ // We want to split on word boundaries, but we need to preserve whitespace as well.

+ // Therefore we split on words, but include all blocks of whitespace in the wordlist.

+ $diff = &new diff($this->_split_on_words($text1, $nl), $this->_split_on_words($text2, $nl));

+

+ // Get the diff in inline format.

+ $renderer = &new diff_renderer_inline(array_merge($this->get_params(), array('split_level' => 'words')));

+

+ // Run the diff and get the output.

+ return str_replace($nl, "\n", $renderer->render($diff)) . "\n";

+ }

+

+ function _split_on_words($string, $newline_escape = "\n")

+ {

+ // Ignore \0; otherwise the while loop will never finish.

+ $string = str_replace("\0", '', $string);

+

+ $words = array();

+ $length = strlen($string);

+ $pos = 0;

+

+ $tab_there = true;

+ while ($pos < $length)

+ {

+ // Check for tabs... do not include them

+ if ($tab_there && substr($string, $pos, 1) === "\t")

+ {

+ $words[] = "\t";

+ $pos++;

+

+ continue;

+ }

+ else

+ {

+ $tab_there = false;

+ }

+

+ // Eat a word with any preceding whitespace.

+ $spaces = strspn(substr($string, $pos), " \n");

+ $nextpos = strcspn(substr($string, $pos + $spaces), " \n");

+ $words[] = str_replace("\n", $newline_escape, substr($string, $pos, $spaces + $nextpos));

+ $pos += $spaces + $nextpos;

+ }

+

+ return $words;

+ }

+

+ function _encode(&$string)

+ {

+ $string = htmlspecialchars($string);

+ }

+}

+

+/**

+* "raw" diff renderer.

+* This class could be used to output a raw unified patch file

+*

+* @package phpBB3

+*/

+class diff_renderer_raw extends diff_renderer

+{

+ var $_leading_context_lines = 4;

+ var $_trailing_context_lines = 4;

+

+ /**

+ * Our function to get the diff

+ */

+ function get_diff_content($diff)

+ {

+ return '<textarea style="height: 400px;" class="full">' . htmlspecialchars($this->render($diff)) . '</textarea>';

+ }

+

+ function _block_header($xbeg, $xlen, $ybeg, $ylen)

+ {

+ if ($xlen != 1)

+ {

+ $xbeg .= ',' . $xlen;

+ }

+

+ if ($ylen != 1)

+ {

+ $ybeg .= ',' . $ylen;

+ }

+ return '@@ -' . $xbeg . ' +' . $ybeg . ' @@';

+ }

+

+ function _context($lines)

+ {

+ return $this->_lines($lines, ' ');

+ }

+

+ function _added($lines)

+ {

+ return $this->_lines($lines, '+');

+ }

+

+ function _deleted($lines)

+ {

+ return $this->_lines($lines, '-');

+ }

+

+ function _changed($orig, $final)

+ {

+ return $this->_deleted($orig) . $this->_added($final);

+ }

+}

+

+/**

+* "chora (Horde)" diff renderer - similar style.

+* This renderer class is a modified human_readable function from the Horde Framework.

+*

+* @package phpBB3

+*/

+class diff_renderer_side_by_side extends diff_renderer

+{

+ var $_leading_context_lines = 3;

+ var $_trailing_context_lines = 3;

+

+ var $lines = array();

+

+ // Hold the left and right columns of lines for change blocks.

+ var $cols;

+ var $state;

+

+ var $data = false;

+

+ /**

+ * Our function to get the diff

+ */

+ function get_diff_content($diff)

+ {

+ global $user;

+

+ $output = '';

+ $output .= '<table cellspacing="0" class="hrdiff">

+<caption>

+ <span class="unmodified">&nbsp;</span> ' . $user->lang['LINE_UNMODIFIED'] . '

+ <span class="added">&nbsp;</span> ' . $user->lang['LINE_ADDED'] . '

+ <span class="modified">&nbsp;</span> ' . $user->lang['LINE_MODIFIED'] . '

+ <span class="removed">&nbsp;</span> ' . $user->lang['LINE_REMOVED'] . '

+</caption>

+<tbody>

+';

+

+ $this->render($diff);

+

+ // Is the diff empty?

+ if (!sizeof($this->lines))

+ {

+ $output .= '<tr><th colspan="2">' . $user->lang['NO_VISIBLE_CHANGES'] . '</th></tr>';

+ }

+ else

+ {

+ // Iterate through every header block of changes

+ foreach ($this->lines as $header)

+ {

+ $output .= '<tr><th>Line ' . $header['oldline'] . '</th><th>' . $user->lang['LINE'] . ' ' . $header['newline'] . '</th></tr>';

+

+ // Each header block consists of a number of changes (add, remove, change).

+ $current_context = '';

+

+ foreach ($header['contents'] as $change)

+ {

+ if (!empty($current_context) && $change['type'] != 'empty')

+ {

+ $line = $current_context;

+ $current_context = '';

+

+ $output .= '<tr class="unmodified"><td><pre>' . ((strlen($line)) ? $line : '&nbsp;') . '</pre></td>

+ <td><pre>' . ((strlen($line)) ? $line : '&nbsp;') . '</pre></td></tr>';

+ }

+

+ switch ($change['type'])

+ {

+ case 'add':

+ $line = '';

+

+ foreach ($change['lines'] as $_line)

+ {

+ $line .= htmlspecialchars($_line) . '<br />';

+ }

+

+ $output .= '<tr><td class="added_empty">&nbsp;</td><td class="added"><pre>' . ((strlen($line)) ? $line : '&nbsp;') . '</pre></td></tr>';

+ break;

+

+ case 'remove':

+ $line = '';

+

+ foreach ($change['lines'] as $_line)

+ {

+ $line .= htmlspecialchars($_line) . '<br />';

+ }

+

+ $output .= '<tr><td class="removed"><pre>' . ((strlen($line)) ? $line : '&nbsp;') . '</pre></td><td class="removed_empty">&nbsp;</td></tr>';

+ break;

+

+ case 'empty':

+ $current_context .= htmlspecialchars($change['line']) . '<br />';

+ break;

+

+ case 'change':

+ // Pop the old/new stacks one by one, until both are empty.

+ $oldsize = sizeof($change['old']);

+ $newsize = sizeof($change['new']);

+ $left = $right = '';

+

+ for ($row = 0, $row_max = max($oldsize, $newsize); $row < $row_max; ++$row)

+ {

+ $left .= isset($change['old'][$row]) ? htmlspecialchars($change['old'][$row]) : '';

+ $left .= '<br />';

+ $right .= isset($change['new'][$row]) ? htmlspecialchars($change['new'][$row]) : '';

+ $right .= '<br />';

+ }

+

+ $output .= '<tr>';

+

+ if (!empty($left))

+ {

+ $output .= '<td class="modified"><pre>' . $left . '</pre></td>';

+ }

+ else if ($row < $oldsize)

+ {

+ $output .= '<td class="modified">&nbsp;</td>';

+ }

+ else

+ {

+ $output .= '<td class="unmodified">&nbsp;</td>';

+ }

+

+ if (!empty($right))

+ {

+ $output .= '<td class="modified"><pre>' . $right . '</pre></td>';

+ }

+ else if ($row < $newsize)

+ {

+ $output .= '<td class="modified">&nbsp;</td>';

+ }

+ else

+ {

+ $output .= '<td class="unmodified">&nbsp;</td>';

+ }

+

+ $output .= '</tr>';

+ break;

+ }

+ }

+

+ if (!empty($current_context))

+ {

+ $line = $current_context;

+ $current_context = '';

+

+ $output .= '<tr class="unmodified"><td><pre>' . ((strlen($line)) ? $line : '&nbsp;') . '</pre></td>';

+ $output .= '<td><pre>' . ((strlen($line)) ? $line : '&nbsp;') . '</pre></td></tr>';

+ }

+ }

+ }

+

+ $output .= '</tbody></table>';

+

+ return $output;

+ }

+

+ function _start_diff()

+ {

+ $this->lines = array();

+

+ $this->data = false;

+ $this->cols = array(array(), array());

+ $this->state = 'empty';

+

+ return '';

+ }

+

+ function _end_diff()

+ {

+ // Just flush any remaining entries in the columns stack.

+ switch ($this->state)

+ {

+ case 'add':

+ $this->data['contents'][] = array('type' => 'add', 'lines' => $this->cols[0]);

+ break;

+

+ case 'remove':

+ // We have some removal lines pending in our stack, so flush them.

+ $this->data['contents'][] = array('type' => 'remove', 'lines' => $this->cols[0]);

+ break;

+

+ case 'change':

+ // We have both remove and addition lines, so this is a change block.

+ $this->data['contents'][] = array('type' => 'change', 'old' => $this->cols[0], 'new' => $this->cols[1]);

+ break;

+ }

+

+ if ($this->data !== false)

+ {

+ $this->lines[] = $this->data;

+ }

+

+ return '';

+ }

+

+ function _block_header($xbeg, $xlen, $ybeg, $ylen)

+ {

+ // Push any previous header information to the return stack.

+ if ($this->data !== false)

+ {

+ $this->lines[] = $this->data;

+ }

+

+ $this->data = array('type' => 'header', 'oldline' => $xbeg, 'newline' => $ybeg, 'contents' => array());

+ $this->state = 'dump';

+ }

+

+ function _added($lines)

+ {

+ array_walk($lines, array(&$this, '_perform_add'));

+ }

+

+ function _perform_add($line)

+ {

+ if ($this->state == 'empty')

+ {

+ return '';

+ }

+

+ // This is just an addition line.

+ if ($this->state == 'dump' || $this->state == 'add')

+ {

+ // Start adding to the addition stack.

+ $this->cols[0][] = $line;

+ $this->state = 'add';

+ }

+ else

+ {

+ // This is inside a change block, so start accumulating lines.

+ $this->state = 'change';

+ $this->cols[1][] = $line;

+ }

+ }

+

+ function _deleted($lines)

+ {

+ array_walk($lines, array(&$this, '_perform_delete'));

+ }

+

+ function _perform_delete($line)

+ {

+ // This is a removal line.

+ $this->state = 'remove';

+ $this->cols[0][] = $line;

+ }

+

+ function _context($lines)

+ {

+ array_walk($lines, array(&$this, '_perform_context'));

+ }

+

+ function _perform_context($line)

+ {

+ // An empty block with no action.

+ switch ($this->state)

+ {

+ case 'add':

+ $this->data['contents'][] = array('type' => 'add', 'lines' => $this->cols[0]);

+ break;

+

+ case 'remove':

+ // We have some removal lines pending in our stack, so flush them.

+ $this->data['contents'][] = array('type' => 'remove', 'lines' => $this->cols[0]);

+ break;

+

+ case 'change':

+ // We have both remove and addition lines, so this is a change block.

+ $this->data['contents'][] = array('type' => 'change', 'old' => $this->cols[0], 'new' => $this->cols[1]);

+ break;

+ }

+

+ $this->cols = array(array(), array());

+ $this->data['contents'][] = array('type' => 'empty', 'line' => $line);

+ $this->state = 'dump';

+ }

+

+ function _changed($orig, $final)

+ {

+ return $this->_deleted($orig) . $this->_added($final);

+ }

+

+}

+

+?> \ No newline at end of file