includes/diffengine/Renderer/inline.php
author Dan Fuhry <dan@enanocms.org>
Mon, 19 Nov 2012 11:38:34 -0500
changeset 1371 d9814c4c2948
parent 1227 bdac73ed481e
permissions -rw-r--r--
Add Output class for Comet (HTTP incremental streams) -- experimental and not working with every browser/apache configuration.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<?php
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/**
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 * "Inline" diff renderer.
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 *
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 * This class renders diffs in the Wiki-style "inline" format.
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 *
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 * $Horde: framework/Text_Diff/Diff/Renderer/inline.php,v 1.16 2006/01/08 00:06:57 jan Exp $
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 *
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 * @author  Ciprian Popovici
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 * @package Text_Diff
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 */
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class Text_Diff_Renderer_inline extends Text_Diff_Renderer {
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		/**
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 		* Number of leading context "lines" to preserve.
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 		*/
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		var $_leading_context_lines = 10000;
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		/**
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 		* Number of trailing context "lines" to preserve.
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 		*/
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		var $_trailing_context_lines = 10000;
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		/**
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 		* Prefix for inserted text.
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 		*/
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		var $_ins_prefix = '<ins>';
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		/**
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 		* Suffix for inserted text.
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 		*/
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		var $_ins_suffix = '</ins>';
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		/**
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 		* Prefix for deleted text.
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 		*/
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		var $_del_prefix = '<del>';
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		/**
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 		* Suffix for deleted text.
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 		*/
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		var $_del_suffix = '</del>';
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		/**
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 		* Header for each change block.
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 		*/
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		var $_block_header = '';
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		/**
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 		* What are we currently splitting on? Used to recurse to show word-level
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 		* changes.
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 		*/
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		var $_split_level = 'words';
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		function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
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		{
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				return $this->_block_header;
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		}
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		function _startBlock($header)
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		{
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				return $header;
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		}
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		function _lines($lines, $prefix = ' ', $encode = true)
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		{
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				if ($encode) {
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						array_walk($lines, array(&$this, '_encode'));
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				}
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				if ($this->_split_level == 'words') {
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						return implode('', $lines);
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				} else {
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						return implode("\n", $lines) . "\n";
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				}
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		}
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		function _added($lines)
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		{
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				array_walk($lines, array(&$this, '_encode'));
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				$lines[0] = $this->_ins_prefix . $lines[0];
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				$lines[count($lines) - 1] .= $this->_ins_suffix;
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				return $this->_lines($lines, ' ', false);
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		}
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		function _deleted($lines, $words = false)
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		{
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				array_walk($lines, array(&$this, '_encode'));
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				$lines[0] = $this->_del_prefix . $lines[0];
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				$lines[count($lines) - 1] .= $this->_del_suffix;
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				return $this->_lines($lines, ' ', false);
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		}
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		function _context($lines)
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		{
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				return "<!-- Start context -->\n<tr><td></td><td class=\"diff-context\">".$this->_lines($lines).'</td></tr>'."\n<!-- End context -->\n\n";
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		}
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		function _changed($orig, $final)
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		{
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				/* If we've already split on words, don't try to do so again - just
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 				* display. */
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				if ($this->_split_level == 'words') {
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						$prefix = '';
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						while ($orig[0] !== false && $final[0] !== false &&
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 									substr($orig[0], 0, 1) == ' ' &&
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 									substr($final[0], 0, 1) == ' ') {
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								$prefix .= substr($orig[0], 0, 1);
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								$orig[0] = substr($orig[0], 1);
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								$final[0] = substr($final[0], 1);
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						}
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						return $prefix . $this->_deleted($orig) . $this->_added($final);
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				}
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				$text1 = implode("\n", $orig);
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				$text2 = implode("\n", $final);
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				/* Non-printing newline marker. */
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				$nl = "\0";
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				/* We want to split on word boundaries, but we need to
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 				* preserve whitespace as well. Therefore we split on words,
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 				* but include all blocks of whitespace in the wordlist. */
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				$diff = &new Text_Diff($this->_splitOnWords($text1, $nl),
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 															$this->_splitOnWords($text2, $nl));
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				/* Get the diff in inline format. */
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				$renderer = &new Text_Diff_Renderer_inline(array_merge($this->getParams(),
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 																															array('split_level' => 'words')));
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				/* Run the diff and get the output. */
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				return str_replace($nl, "\n", $renderer->render($diff)) . "\n";
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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		}
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		function _splitOnWords($string, $newlineEscape = "\n")
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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		{
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				$words = array();
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				$length = strlen($string);
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				$pos = 0;
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				while ($pos < $length) {
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						// Eat a word with any preceding whitespace.
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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						$spaces = strspn(substr($string, $pos), " \n");
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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						$nextpos = strcspn(substr($string, $pos + $spaces), " \n");
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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						$words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
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						$pos += $spaces + $nextpos;
bdac73ed481e Going ahead with the switch to tabs. This is a major coding standards change! If any unusual parser bugs show up, check this changeset. Converted all .php, .js, .tpl, .css, and .json files and did basic testing.
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				}
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				return $words;
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		}
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		function _encode(&$string)
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		{
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				$string = htmlspecialchars($string);
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		}
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}