'; /** * Suffix for inserted text. */ var $_ins_suffix = ''; /** * Prefix for deleted text. */ var $_del_prefix = ''; /** * Suffix for deleted text. */ var $_del_suffix = ''; /** * Header for each change block. */ var $_block_header = ''; /** * What are we currently splitting on? Used to recurse to show word-level * changes. */ var $_split_level = 'lines'; function _lines($lines, $prefix = ' ') { if ($this->_split_level == 'words') { return implode('', $lines); } else { return implode("\n", $lines) . "\n"; } } function _blockHeader($xbeg, $xlen, $ybeg, $ylen) { return $this->_block_header; } function _startBlock($header) { return $header; } function _added($lines) { $lines[0] = $this->_ins_prefix . $lines[0]; $lines[count($lines) - 1] .= $this->_ins_suffix; return $this->_lines($lines); } function _deleted($lines, $words = false) { $lines[0] = $this->_del_prefix . $lines[0]; $lines[count($lines) - 1] .= $this->_del_suffix; return $this->_lines($lines); } 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') { $prefix = ''; while (substr($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. */ $diff = &new Text_Diff($this->_splitOnWords($text1, $nl), $this->_splitOnWords($text2, $nl)); /* Get the diff in inline format. */ $renderer = &new Text_Diff_Renderer_inline(array_merge($this->getParams(), array('split_level' => 'words'))); /* Run the diff and get the output. */ return str_replace($nl, "\n", $renderer->render($diff)) . "\n"; } function _splitOnWords($string, $newlineEscape = "\n") { $words = array(); $length = strlen($string); $pos = 0; while ($pos < $length) { // Eat a word with any preceding whitespace. $spaces = strspn($string, " \n", $pos); $nextpos = strcspn($string, " \n", $pos + $spaces); $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos)); $pos += $spaces + $nextpos; } return $words; } }