function htmlDiff($from, $to)
{
// Create an XML parser
$xml_parser = xml_parser_create('');
$domfrom = new DomTreeBuilder();
// Set the functions to handle opening and closing tags
xml_set_element_handler($xml_parser, array($domfrom, "startElement"), array($domfrom, "endElement"));
// Set the function to handle blocks of character data
xml_set_character_data_handler($xml_parser, array($domfrom, "characters"));
HTMLDiffer::diffDebug("Parsing " . strlen($from) . " characters worth of HTML\n");
if (!xml_parse($xml_parser, '<?xml version="1.0" encoding="UTF-8"?>' . Sanitizer::hackDocType() . '<body>', false) || !xml_parse($xml_parser, $from, false) || !xml_parse($xml_parser, '</body>', true)) {
$error = xml_error_string(xml_get_error_code($xml_parser));
$line = xml_get_current_line_number($xml_parser);
$col = xml_get_current_column_number($xml_parser);
HTMLDiffer::diffDebug("XML error: {$error} at line {$line} and column {$col}\n");
}
xml_parser_free($xml_parser);
unset($from);
$xml_parser = xml_parser_create('');
$domto = new DomTreeBuilder();
// Set the functions to handle opening and closing tags
xml_set_element_handler($xml_parser, array($domto, "startElement"), array($domto, "endElement"));
// Set the function to handle blocks of character data
xml_set_character_data_handler($xml_parser, array($domto, "characters"));
HTMLDiffer::diffDebug("Parsing " . strlen($to) . " characters worth of HTML\n");
if (!xml_parse($xml_parser, '<?xml version="1.0" encoding="UTF-8"?>' . Sanitizer::hackDocType() . '<body>', false) || !xml_parse($xml_parser, $to, false) || !xml_parse($xml_parser, '</body>', true)) {
$error = xml_error_string(xml_get_error_code($xml_parser));
$line = xml_get_current_line_number($xml_parser);
$col = xml_get_current_column_number($xml_parser);
HTMLDiffer::diffDebug("XML error: {$error} at line {$line} and column {$col}\n");
}
xml_parser_free($xml_parser);
unset($to);
$diffengine = new WikiDiff3();
$differences = $this->preProcess($diffengine->diff_range($domfrom->getDiffLines(), $domto->getDiffLines()));
unset($xml_parser, $diffengine);
$textNodeDiffer = new TextNodeDiffer($domto, $domfrom);
$currentIndexLeft = 0;
$currentIndexRight = 0;
foreach ($differences as &$d) {
if ($d->leftstart > $currentIndexLeft) {
$textNodeDiffer->handlePossibleChangedPart($currentIndexLeft, $d->leftstart, $currentIndexRight, $d->rightstart);
}
if ($d->leftlength > 0) {
$textNodeDiffer->markAsDeleted($d->leftstart, $d->leftend, $d->rightstart);
}
$textNodeDiffer->markAsNew($d->rightstart, $d->rightend);
$currentIndexLeft = $d->leftend;
$currentIndexRight = $d->rightend;
}
$oldLength = $textNodeDiffer->lengthOld();
if ($currentIndexLeft < $oldLength) {
$textNodeDiffer->handlePossibleChangedPart($currentIndexLeft, $oldLength, $currentIndexRight, $textNodeDiffer->lengthNew());
}
$textNodeDiffer->expandWhiteSpace();
$output = new HTMLOutput('htmldiff');
return $output->parse($textNodeDiffer->bodyNode);
}
