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/**
 * &quot;Inline&quot; diff renderer.
 *
 * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
 *
 * @author  Ciprian Popovici
 * @package Text_Diff
 */

/** Text_Diff_Renderer */

// WP #7391
require_once dirname(dirname(__FILE__)) . '/Renderer.php';

/**
 * &quot;Inline&quot; diff renderer.
 *
 * This class renders diffs in the Wiki-style &quot;inline&quot; format.
 *
 * @author  Ciprian Popovici
 * @package Text_Diff
 */
class Text_Diff_Renderer_inline extends Text_Diff_Renderer {

    /**
     * Number of leading context &quot;lines&quot; to preserve.
     *
     * @var integer
     */
    var $_leading_context_lines = 10000;

    /**
     * Number of trailing context &quot;lines&quot; to preserve.
     *
     * @var integer
     */
    var $_trailing_context_lines = 10000;

    /**
     * Prefix for inserted text.
     *
     * @var string
     */
    var $_ins_prefix = '&lt;ins&gt;';

    /**
     * Suffix for inserted text.
     *
     * @var string
     */
    var $_ins_suffix = '&lt;/ins&gt;';

    /**
     * Prefix for deleted text.
     *
     * @var string
     */
    var $_del_prefix = '&lt;del&gt;';

    /**
     * Suffix for deleted text.
     *
     * @var string
     */
    var $_del_suffix = '&lt;/del&gt;';

    /**
     * Header for each change block.
     *
     * @var string
     */
    var $_block_header = '';

    /**
     * Whether to split down to character-level.
     *
     * @var boolean
     */
    var $_split_characters = false;

    /**
     * What are we currently splitting on? Used to recurse to show word-level
     * or character-level changes.
     *
     * @var string
     */
    var $_split_level = 'lines';

    function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        return $this-&gt;_block_header;
    }

    function _startBlock($header)
    {
        return $header;
    }

    function _lines($lines, $prefix = ' ', $encode = true)
    {
        if ($encode) {
            array_walk($lines, array(&amp;$this, '_encode'));
        }

        if ($this-&gt;_split_level == 'lines') {
            return implode(&quot;\n&quot;, $lines) . &quot;\n&quot;;
        } else {
            return implode('', $lines);
        }
    }

    function _added($lines)
    {
        array_walk($lines, array(&amp;$this, '_encode'));
        $lines[0] = $this-&gt;_ins_prefix . $lines[0];
        $lines[count($lines) - 1] .= $this-&gt;_ins_suffix;
        return $this-&gt;_lines($lines, ' ', false);
    }

    function _deleted($lines, $words = false)
    {
        array_walk($lines, array(&amp;$this, '_encode'));
        $lines[0] = $this-&gt;_del_prefix . $lines[0];
        $lines[count($lines) - 1] .= $this-&gt;_del_suffix;
        return $this-&gt;_lines($lines, ' ', false);
    }

    function _changed($orig, $final)
    {
        /* If we've already split on characters, just display. */
        if ($this-&gt;_split_level == 'characters') {
            return $this-&gt;_deleted($orig)
                . $this-&gt;_added($final);
        }

        /* If we've already split on words, just display. */
        if ($this-&gt;_split_level == 'words') {
            $prefix = '';
            while ($orig[0] !== false &amp;&amp; $final[0] !== false &amp;&amp;
                   substr($orig[0], 0, 1) == ' ' &amp;&amp;
                   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 . $this-&gt;_deleted($orig) . $this-&gt;_added($final);
        }

        $text1 = implode(&quot;\n&quot;, $orig);
        $text2 = implode(&quot;\n&quot;, $final);

        /* Non-printing newline marker. */
        $nl = &quot;\0&quot;;

        if ($this-&gt;_split_characters) {
            $diff = new Text_Diff('native',
                                  array(preg_split('//', $text1),
                                        preg_split('//', $text2)));
        } else {
            /* 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. */
            $diff = new Text_Diff('native',
                                  array($this-&gt;_splitOnWords($text1, $nl),
                                        $this-&gt;_splitOnWords($text2, $nl)));
        }

        /* Get the diff in inline format. */
        $renderer = new Text_Diff_Renderer_inline
            (array_merge($this-&gt;getParams(),
                         array('split_level' =&gt; $this-&gt;_split_characters ? 'characters' : 'words')));

        /* Run the diff and get the output. */
        return str_replace($nl, &quot;\n&quot;, $renderer-&gt;render($diff)) . &quot;\n&quot;;
    }

    function _splitOnWords($string, $newlineEscape = &quot;\n&quot;)
    {
        // Ignore \0; otherwise the while loop will never finish.
        $string = str_replace(&quot;\0&quot;, '', $string);

        $words = array();
        $length = strlen($string);
        $pos = 0;

        while ($pos &lt; $length) {
            // Eat a word with any preceding whitespace.
            $spaces = strspn(substr($string, $pos), &quot; \n&quot;);
            $nextpos = strcspn(substr($string, $pos + $spaces), &quot; \n&quot;);
            $words[] = str_replace(&quot;\n&quot;, $newlineEscape, substr($string, $pos, $spaces + $nextpos));
            $pos += $spaces + $nextpos;
        }

        return $words;
    }

    function _encode(&amp;$string)
    {
        $string = htmlspecialchars($string);
    }

}
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