includes/diffengine/Renderer/inline.php
author Dan
Sat, 25 Aug 2007 12:11:31 -0400
changeset 98 6457a9b983c6
parent 1 fe660c52c48f
permissions -rw-r--r--
Fixed non-object reference in databaseless template, added locking for Javascript paginator, made comments on AES key size more clear in constants, and disallowed "anonymous" and IP addresses for admin username in install.php; Loch Ness release candidate
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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";
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    }
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    function _splitOnWords($string, $newlineEscape = "\n")
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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.
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            $spaces = strspn(substr($string, $pos), " \n");
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            $nextpos = strcspn(substr($string, $pos + $spaces), " \n");
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            $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
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            $pos += $spaces + $nextpos;
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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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}