renderer.php

这些都是我以前学习是用到的源码

<?php
/** 
*
* @package phpBB3
* @version $Id: renderer.php,v 1.2 2006/11/17 19:37:57 acydburn Exp $
* @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 phpBB Group 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;