XoopsModules25x/mylinks

<?php

/**
 * "Inline" diff renderer.
 *
 * This class renders diffs in the Wiki-style "inline" format.
 *
 * $Horde: framework/Text_Diff/Diff/Renderer/inline.php,v 1.14 2005/07/22 19:45:15 chuck Exp $
 *
 * @author  Ciprian Popovici
 * @package Text_Diff
 */
class Text_Diff_Renderer_inline extends Text_Diff_Renderer
{

    /**
     * Number of leading context "lines" to preserve.
     */
    public $_leading_context_lines = 10000;

    /**
     * Number of trailing context "lines" to preserve.
     */
    public $_trailing_context_lines = 10000;

    /**
     * Prefix for inserted text.
     */
    public $_ins_prefix = '<ins>';

    /**
     * Suffix for inserted text.
     */
    public $_ins_suffix = '</ins>';

    /**
     * Prefix for deleted text.
     */
    public $_del_prefix = '<del>';

    /**
     * Suffix for deleted text.
     */
    public $_del_suffix = '</del>';

    /**
     * Header for each change block.
     */
    public $_block_header = '';

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

    /**
     * @param $xbeg
     * @param $xlen
     * @param $ybeg
     * @param $ylen
     * @return string
     */
    public function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        return $this->_block_header;
    }

    /**
     * @param $header
     * @return mixed
     */
    public function _startBlock($header)
    {
        return $header;
    }

    /**
     * @param        $lines
     * @param string $prefix
     * @param bool   $encode
     * @return string
     */
    public function _lines($lines, $prefix = ' ', $encode = true)
    {
        if ($encode) {
            array_walk($lines, array(&$this, '_encode'));
        }

        if ($this->_split_level == 'words') {
            return implode('', $lines);
        } else {
            return implode("\n", $lines) . "\n";
        }
    }

    /**
     * @param $lines
     * @return string
     */
    public function _added($lines)
    {
        array_walk($lines, array(&$this, '_encode'));
        $lines[0] = $this->_ins_prefix . $lines[0];
        $lines[count($lines) - 1] .= $this->_ins_suffix;

        return $this->_lines($lines, ' ', false);
    }

    /**
     * @param      $lines
     * @param bool $words
     * @return string
     */
    public function _deleted($lines, $words = false)
    {
        array_walk($lines, array(&$this, '_encode'));
        $lines[0] = $this->_del_prefix . $lines[0];
        $lines[count($lines) - 1] .= $this->_del_suffix;

        return $this->_lines($lines, ' ', false);
    }

    /**
     * @param $orig
     * @param $final
     * @return string
     */
    public function _changed($orig, $final)
    {
        /* If we've already split on words, don't try to do so again - just
         * display. */
        if ($this->_split_level == 'words') {
            $prefix = '';
            while ($orig[0] !== false && $final[0] !== false && substr($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";
    }

    /**
     * @param        $string
     * @param string $newlineEscape
     * @return array
     */
    public function _splitOnWords($string, $newlineEscape = "\n")
    {
        $words  = array();
        $length = strlen($string);
        $pos    = 0;

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

        return $words;
    }

    /**
     * @param $string
     */
    public function _encode(&$string)
    {
        $string = htmlspecialchars($string);
    }
}