<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
/**
* @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 Limited 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.
*
* Copyright 2004-2008 The Horde Project (http://www.horde.org/)
*
* @package diff
*/
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 $_trailing_context_lines = 0;
/**
* Constructor.
*/
function __construct($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_1 = $diff3->get_original();
$diff_2 = $diff3->merged_output();
unset($diff3);
$diff = new diff($diff_1, $diff_2);
}
$nlead = $this->_leading_context_lines;
$ntrail = $this->_trailing_context_lines;
$output = $this->_start_diff();
$diffs = $diff->get_diff();
foreach ($diffs as $i => $edit)
{
// If these are unchanged (copied) lines, and we want to keep leading or trailing context lines, extract them from the copy block.
if (is_a($edit, 'diff_op_copy'))
{
// Do we have any diff blocks yet?
if (is_array($block))
{
// How many lines to keep as context from the copy block.
$keep = ($i == count($diffs) - 1) ? $ntrail : $nlead + $ntrail;
if (count($edit->orig) <= $keep)
{
// We have less lines in the block than we want for context => keep the whole block.
$block[] = $edit;
}
else
{
if ($ntrail)
{
// Create a new block with as many lines as we need for the trailing context.
$context = array_slice($edit->orig, 0, $ntrail);
$block[] = new diff_op_copy($context);
}
$output .= $this->_block($x0, $ntrail + $xi - $x0, $y0, $ntrail + $yi - $y0, $block);
$block = false;
}
}
// Keep the copy block as the context for the next block.
$context = $edit->orig;
}
else
{
// Don't we have any diff blocks yet?
if (!is_array($block))
{
// Extract context lines from the preceding copy block.
$context = array_slice($context, count($context) - $nlead);
$x0 = $xi - count($context);
$y0 = $yi - count($context);
$block = array();
if ($context)
{
$block[] = new diff_op_copy($context);
}
}
$block[] = $edit;
}
$xi += ($edit->orig) ? count($edit->orig) : 0;
$yi += ($edit->final) ? count($edit->final) : 0;
}
if (is_array($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 + $ylen - 1);
}
// this matches the GNU Diff behaviour
if ($xlen && !$ylen)
{
$ybeg--;
}
else if (!$xlen)
{
$xbeg--;
}
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 diff
*/
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, ' '), ENT_COMPAT) . '<br /></pre>';
}
function _added($lines)
{
return '<pre class="diff added">' . htmlspecialchars($this->_lines($lines, '+'), ENT_COMPAT) . '<br /></pre>';
}
function _deleted($lines)
{
return '<pre class="diff removed">' . htmlspecialchars($this->_lines($lines, '-'), ENT_COMPAT) . '<br /></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 diff
*/
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)) . '<br /></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];
$lines[count($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];
$lines[count($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.
$splitted_text_1 = $this->_split_on_words($text1, $nl);
$splitted_text_2 = $this->_split_on_words($text2, $nl);
$diff = new diff($splitted_text_1, $splitted_text_2);
unset($splitted_text_1, $splitted_text_2);
// 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, ENT_COMPAT);
}
}
/**
* "raw" diff renderer.
* This class could be used to output a raw unified patch file
*
* @package diff
*/
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: 290px;" rows="15" cols="76" class="full">' . htmlspecialchars($this->render($diff), ENT_COMPAT) . '</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 diff
*/
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"> </span> ' . $user->lang['LINE_UNMODIFIED'] . '
<span class="added"> </span> ' . $user->lang['LINE_ADDED'] . '
<span class="modified"> </span> ' . $user->lang['LINE_MODIFIED'] . '
<span class="removed"> </span> ' . $user->lang['LINE_REMOVED'] . '
</caption>
<tbody>
';
$this->render($diff);
// Is the diff empty?
if (!count($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>' . $user->lang['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)) ? $line : ' ') . '<br /></pre></td>
<td><pre>' . ((strlen($line)) ? $line : ' ') . '<br /></pre></td></tr>';
}
switch ($change['type'])
{
case 'add':
$line = '';
foreach ($change['lines'] as $_line)
{
$line .= htmlspecialchars($_line, ENT_COMPAT) . '<br />';
}
$output .= '<tr><td class="added_empty"> </td><td class="added"><pre>' . ((strlen($line)) ? $line : ' ') . '<br /></pre></td></tr>';
break;
case 'remove':
$line = '';
foreach ($change['lines'] as $_line)
{
$line .= htmlspecialchars($_line, ENT_COMPAT) . '<br />';
}
$output .= '<tr><td class="removed"><pre>' . ((strlen($line)) ? $line : ' ') . '<br /></pre></td><td class="removed_empty"> </td></tr>';
break;
case 'empty':
$current_context .= htmlspecialchars($change['line'], ENT_COMPAT) . '<br />';
break;
case 'change':
// Pop the old/new stacks one by one, until both are empty.
$oldsize = count($change['old']);
$newsize = count($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], ENT_COMPAT) : '';
$left .= '<br />';
$right .= isset($change['new'][$row]) ? htmlspecialchars($change['new'][$row], ENT_COMPAT) : '';
$right .= '<br />';
}
$output .= '<tr>';
if (!empty($left))
{
$output .= '<td class="modified"><pre>' . $left . '<br /></pre></td>';
}
else if ($row < $oldsize)
{
$output .= '<td class="modified"> </td>';
}
else
{
$output .= '<td class="unmodified"> </td>';
}
if (!empty($right))
{
$output .= '<td class="modified"><pre>' . $right . '<br /></pre></td>';
}
else if ($row < $newsize)
{
$output .= '<td class="modified"> </td>';
}
else
{
$output .= '<td class="unmodified"> </td>';
}
$output .= '</tr>';
break;
}
}
if (!empty($current_context))
{
$line = $current_context;
$current_context = '';
$output .= '<tr class="unmodified"><td><pre>' . ((strlen($line)) ? $line : ' ') . '<br /></pre></td>';
$output .= '<td><pre>' . ((strlen($line)) ? $line : ' ') . '<br /></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);
}
}