includes/diffengine/Renderer/inline.php
author Dan Fuhry <dan@enanocms.org>
Tue, 12 Jul 2011 22:37:21 -0400
changeset 344 0fa28c5aabe9
parent 1 fe660c52c48f
permissions -rw-r--r--
Release prep 1.0.6pl4
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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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}