<?php

require_once dirname(dirname(__FILE__)) . '/Renderer.php';
class Text_Diff_Renderer_inline extends Text_Diff_Renderer
{
    var $_leading_context_lines = 10000;
    var $_trailing_context_lines = 10000;
    var $_ins_prefix = '<ins>';
    var $_ins_suffix = '</ins>';
    var $_del_prefix = '<del>';
    var $_del_suffix = '</del>';
    var $_block_header = '';
    var $_split_characters = false;
    var $_split_level = 'lines';
    function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        return $this->_block_header;
    }
    function _startBlock($header)
    {
        return $header;
    }
    function _lines($lines, $prefix = ' ', $encode = true)
    {
        if ($encode) {
            array_walk($lines, array(&$this, '_encode'));
        }
        if ($this->_split_level == 'lines') {
            return implode("\n", $lines) . "\n";
        } else {
            return implode('', $lines);
        }
    }
    function _added($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);
    }
    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);
    }
    function _changed($orig, $final)
    {
        if ($this->_split_level == 'characters') {
            return $this->_deleted($orig) . $this->_added($final);
        }
        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);
        $nl = "\0";
        if ($this->_split_characters) {
            $diff = new Text_Diff('native', array(preg_split('//', $text1), preg_split('//', $text2)));
        } else {
            $diff = new Text_Diff('native', array($this->_splitOnWords($text1, $nl), $this->_splitOnWords($text2, $nl)));
        }
        $renderer = new Text_Diff_Renderer_inline(array_merge($this->getParams(), array('split_level' => $this->_split_characters ? 'characters' : 'words')));
        return str_replace($nl, "\n", $renderer->render($diff)) . "\n";
    }
    function _splitOnWords($string, $newlineEscape = "\n")
    {
        $string = str_replace("\0", '', $string);
        $words = array();
        $length = strlen($string);
        $pos = 0;
        while ($pos < $length) {
            $spaces = strspn(substr($string, $pos), " \n");
            $nextpos = strcspn(substr($string, $pos + $spaces), " \n");
            $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
            $pos += $spaces + $nextpos;
        }
        return $words;
    }
    function _encode(&$string)
    {
        $string = htmlspecialchars($string);
    }
}