Code Changes

*
* Copyright 2004 Geoffrey T. Dairiki <[email protected]>
* Copyright 2004-2008 The Horde Project (http://www.horde.org/)

	}

	/**
	* 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;

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

				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;

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

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

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

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

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

	/**
	* 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;

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

	}

	/**
	* Return merged output (used by the renderer)
	*
	* @return mixed the merged output
	*/
	function merged_output()
	{
		return $this->get_conflicts_content();

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

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

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

			// Prepare the arrays before we compare them. ;)
			$this->solve_prepare();

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

				$this->solve_conflict();

	}

	/**
	* 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);

		// Go through the conflict code
		for ($i = 0, $j = 0, $size = sizeof($_final1); $i < $size; $i++, $j = $i)
		{
			$line = $_final1[$i];
			$skip = 0;

			for ($x = 0; $x < $compare_seq; $x++)
			{
				// Try to skip all matching lines
				if (trim($line) === trim($_orig[$x]))
				{
					$line = (++$j < $size) ? $_final1[$j] : $line;
					$skip++;
				}
			}

			if ($skip === $compare_seq)
			{
				$result['merge_found'] = true;

				if ($final2 !== false)
				{
					$result['merge'] = array_merge($result['merge'], $this->$final2);
				}
				$i += ($skip - 1);
			}
			else if ($final2 !== false)
			{
				$result['merge'][] = $line;
			}
		}

		return $result;
	}

	/**
	* Tries to solve conflicts aggressively based on typical "assumptions"
	* @author acydburn
	*/
	function solve_conflict()
	{
		$this->_merged = false;

		// CASE ONE: orig changed into final2, but modified/unknown code in final1.
		// IF orig is found "as is" in final1 we replace the code directly in final1 and populate this as final2/merge
		if (sizeof($this->orig) && sizeof($this->final2))
		{
			$result = $this->_compare_conflict_seq('orig', 'final1', 'final2');

			if ($result['merge_found'])
			{
				$this->final2 = $result['merge'];
				$this->_merged = &$this->final2;
				return;
			}

			$result = $this->_compare_conflict_seq('final2', 'final1');

			if ($result['merge_found'])
			{
				$this->_merged = &$this->final1;
				return;
			}

			// Try to solve $Id$ issues. ;)
			if (sizeof($this->orig) == 1 && sizeof($this->final1) == 1 && sizeof($this->final2) == 1)
			{
				$match = '#^' . preg_quote('* @version $Id: ', '#') . '[a-z\._\- ]+[0-9]+ [0-9]{4}-[0-9]{2}-[0-9]{2} [0-9\:Z]+ [a-z0-9_\- ]+\$$#';

				if (preg_match($match, $this->orig[0]) && preg_match($match, $this->final1[0]) && preg_match($match, $this->final2[0]))
				{
					$this->_merged = &$this->final2;
					return;
				}
			}

			$second_run = false;

			// Try to solve issues where the only reason why the above did not work is a newline being removed in the final1 code but exist in the orig/final2 code
			if (trim($this->orig[0]) === '' && trim($this->final2[0]) === '')
			{
				unset($this->orig[0], $this->final2[0]);
				$this->orig = array_values($this->orig);
				$this->final2 = array_values($this->final2);

				$second_run = true;
			}

			// The same is true for a line at the end. ;)
			if (sizeof($this->orig) && sizeof($this->final2) && sizeof($this->orig) === sizeof($this->final2) && trim($this->orig[sizeof($this->orig)-1]) === '' && trim($this->final2[sizeof($this->final2)-1]) === '')
			{
				unset($this->orig[sizeof($this->orig)-1], $this->final2[sizeof($this->final2)-1]);
				$this->orig = array_values($this->orig);
				$this->final2 = array_values($this->final2);

				$second_run = true;
			}

			if ($second_run)
			{
				$result = $this->_compare_conflict_seq('orig', 'final1', 'final2');

				if ($result['merge_found'])
				{
					$this->final2 = $result['merge'];
					$this->_merged = &$this->final2;
					return;
				}

				$result = $this->_compare_conflict_seq('final2', 'final1');

				if ($result['merge_found'])
				{
					$this->_merged = &$this->final1;
					return;
				}
			}

			return;
		}

		// CASE TWO: Added lines from orig to final2 but final1 had added lines too. Just merge them.
		if (!sizeof($this->orig) && $this->final1 !== $this->final2 && sizeof($this->final1) && sizeof($this->final2))
		{
			$result = $this->_compare_conflict_seq('final2', 'final1');

			if ($result['merge_found'])
			{
				$this->final2 = $this->final1;
				$this->_merged = &$this->final1;
			}
			else
			{
				$result = $this->_compare_conflict_seq('final1', 'final2');

				if (!$result['merge_found'])
				{
					$this->final2 = array_merge($this->final1, $this->final2);
					$this->_merged = &$this->final2;
				}
				else
				{
					$this->final2 = $this->final1;
					$this->_merged = &$this->final1;
				}
			}

			return;
		}

		// CASE THREE: Removed lines (orig has the to-remove line(s), but final1 has additional lines which does not need to be removed). Just remove orig from final1 and then use final1 as final2/merge
		if (!sizeof($this->final2) && sizeof($this->orig) && sizeof($this->final1) && $this->orig !== $this->final1)
		{
			$result = $this->_compare_conflict_seq('orig', 'final1');

			if (!$result['merge_found'])
			{
				return;
			}

			// First of all, try to find the code in orig in final1. ;)
			$compare_seq = sizeof($this->orig);
			$begin = $end = -1;
			$j = 0;

			for ($i = 0, $size = sizeof($this->final1); $i < $size; $i++)
			{
				$line = $this->final1[$i];

				if (trim($line) === trim($this->orig[$j]))
				{
					// Mark begin
					if ($begin === -1)
					{
						$begin = $i;
					}

					// End is always $i, the last found line
					$end = $i;

					if (isset($this->orig[$j+1]))
					{
						$j++;
					}
				}
			}

			if ($begin !== -1 && $begin + ($compare_seq - 1) == $end)
			{
				foreach ($this->final1 as $i => $line)
				{
					if ($i < $begin || $i > $end)
					{
						$merged[] = $line;
					}
				}

				$this->final2 = $merged;
				$this->_merged = &$this->final2;
			}

			return;
		}

		return;