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<?php

/**

*

* @package diff

* @copyright (c) 2006 phpBB Group

* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2

*

*/

/**

* @ignore

*/

if (!defined('IN_PHPBB'))

{

        exit;

}

/**

* Code from pear.php.net, Text_Diff-1.1.0 package

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

*

* Modified by phpBB Group 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.

*

* Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org>

* Copyright 2004-2008 The Horde Project (http://www.horde.org/)

*

* @package diff

* @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(&$from_content, &$to_content, $preserve_cr = true)

        {

                $diff_engine = new diff_engine();

                $this->_edits = $diff_engine->diff($from_content, $to_content, $preserve_cr);

        }

        /**

        * Returns the array of differences.

        */

        function get_diff()

        {

                return $this->_edits;

        }

        /**

        * returns the number of new (added) lines in a given diff.

        *

        * @since Text_Diff 1.1.0

        *

        * @return integer The number of new lines

        */

        function count_added_lines()

        {

                $count = 0;

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        if (is_a($edit, 'diff_op_add') || is_a($edit, 'diff_op_change'))

                        {

                                $count += $edit->nfinal();

                        }

                }

                return $count;

        }

        /**

        * Returns the number of deleted (removed) lines in a given diff.

        *

        * @since Text_Diff 1.1.0

        *

        * @return integer The number of deleted lines

        */

        function count_deleted_lines()

        {

                $count = 0;

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        if (is_a($edit, 'diff_op_delete') || is_a($edit, 'diff_op_change'))

                        {

                                $count += $edit->norig();

                        }

                }

                return $count;

        }

        /**

        * 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();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        $rev->_edits[] = $edit->reverse();

                }

                return $rev;

        }

        /**

        * Checks for an empty diff.

        *

        * @return boolean  True if two sequences were identical.

        */

        function is_empty()

        {

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        // skip diff_op_copy

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

                        {

                                continue;

                        }

                        if (is_a($edit, 'diff_op_delete') || is_a($edit, 'diff_op_add'))

                        {

                                $orig = $edit->orig;

                                $final = $edit->final;

                                // We can simplify one case where the array is usually supposed to be empty...

                                if (sizeof($orig) == 1 && trim($orig[0]) === '') $orig = array();

                                if (sizeof($final) == 1 && trim($final[0]) === '') $final = array();

                                if (!$orig && !$final)

                                {

                                        continue;

                                }

                                return false;

                        }

                        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;

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        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();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        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();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        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;

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

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

                        {

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

                        }

                        $prevtype = get_class($edit);

                }

                return true;

        }

}

/**

* @package diff

* @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 diff

* @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 diff

* @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 diff

* @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 diff

* @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 diff

* @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 diff

* @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, $preserve_cr = true)

        {

                $diff_engine = new diff_engine();

                $diff_1 = $diff_engine->diff($orig, $final1, $preserve_cr);

                $diff_2 = $diff_engine->diff($orig, $final2, $preserve_cr);

                unset($diff_engine);

                $this->_edits = $this->_diff3($diff_1, $diff_2);

        }

        /**

        * Return number of conflicts

        */

        function get_num_conflicts()

        {

                $conflicts = 0;

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        if ($edit->is_conflict())

                        {

                                $conflicts++;

                        }

                }

                return $conflicts;

        }

        /**

        * Get conflicts content for download. This is generally a merged file, but preserving conflicts and adding explanations to it.

        * A user could then go through this file, search for the conflicts and changes the code accordingly.

        *

        * @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 string $label_sep the explanation between label1 and label2 - more of a helper for the user

        *

        * @return mixed the merged output

        */

        function get_conflicts_content($label1 = 'CURRENT_FILE', $label2 = 'NEW_FILE', $label_sep = 'DIFF_SEP_EXPLAIN')

        {

                global $user;

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

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

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

                $lines = array();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        if ($edit->is_conflict())

                        {

                                // Start conflict label

                                $label_start        = array('<<<<<<< ' . $label1);

                                $label_mid                = array('======= ' . $label_sep);

                                $label_end                = array('>>>>>>> ' . $label2);

                                $lines = array_merge($lines, $label_start, $edit->final1, $label_mid, $edit->final2, $label_end);

                                $this->_conflicting_blocks++;

                        }

                        else

                        {

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

                        }

                }

                return $lines;

        }

        /**

        * Return merged output (used by the renderer)

        *

        * @return mixed the merged output

        */

        function merged_output()

        {

                return $this->get_conflicts_content();

        }

        /**

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

        */

        function merged_new_output()

        {

                $lines = array();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        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();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        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();

                for ($i = 0, $size = sizeof($this->_edits); $i < $size; $i++)

                {

                        $edit = $this->_edits[$i];

                        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 diff

* @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))

                {

                        // Prepare the arrays before we compare them. ;)

                        $this->solve_prepare();

                        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

                        {

                                // The following tries to aggressively solve conflicts...

                                $this->_merged = false;

                                $this->solve_conflict();

                        }

                }

                return $this->_merged;

        }

        function is_conflict()

        {

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

        }

        /**

        * Function to prepare the arrays for comparing - we want to skip over newline changes

        * @author acydburn

        */

        function solve_prepare()

        {

                // We can simplify one case where the array is usually supposed to be empty...

                if (sizeof($this->orig) == 1 && trim($this->orig[0]) === '') $this->orig = array();

                if (sizeof($this->final1) == 1 && trim($this->final1[0]) === '') $this->final1 = array();

                if (sizeof($this->final2) == 1 && trim($this->final2[0]) === '') $this->final2 = array();

                // Now we only can have the case where the only difference between arrays are newlines, so compare all cases

                // First, some strings we can compare...

                $orig = $final1 = $final2 = '';

                foreach ($this->orig as $null => $line) $orig .= trim($line);

                foreach ($this->final1 as $null => $line) $final1 .= trim($line);

                foreach ($this->final2 as $null => $line) $final2 .= trim($line);

                // final1 === final2

                if ($final1 === $final2)

                {

                        // We preserve the part which will be used in the merge later

                        $this->final2 = $this->final1;

                }

                // final1 === orig

                else if ($final1 === $orig)

                {

                        // Here it does not really matter what we choose, but we will use the new code

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

                }

                // final2 === orig

                else if ($final2 === $orig)

                {

                        // Here it does not really matter too (final1 will be used), but we will use the new code

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

                }

        }

        /**

        * Find code portions from $orig in $final1 and use $final2 as merged instance if provided

        * @author acydburn

        */

        function _compare_conflict_seq($orig, $final1, $final2 = false)

        {

                $result = array('merge_found' => false, 'merge' => array());

                $_orig = &$this->$orig;

                $_final1 = &$this->$final1;

                // Ok, we basically search for $orig in $final1

                $compare_seq = sizeof($_orig);