/**
* private
* check given html dom node for given check_id, save result into $this->result
* parameters:
* $e: simple html dom node
* $check_id: check id
*
* return "success" or "fail"
*/
private function check($e, $check_id)
{
global $msg, $base_href, $tag_size;
// don't check the lines before $line_offset
if ($e->linenumber <= $this->line_offset) {
return;
}
if ($e->linenumber == 1 && $this->col_offset > 0) {
$col_number = $e->colnumber - $this->col_offset;
} else {
$col_number = $e->colnumber;
}
$line_number = $e->linenumber - $this->line_offset;
$result = $this->get_check_result($line_number, $col_number, $check_id);
// has not been checked
if (!$result) {
$check_result = eval($this->check_func_array[$check_id]);
//CSS code variable
$css_code = BasicChecks::getCssOutput();
$checksDAO = new ChecksDAO();
$row = $checksDAO->getCheckByID($check_id);
if (is_null($check_result)) {
// when $check_result is not true/false, must be something wrong with the check function.
// show warning message and skip this check
$msg->addError(array('CHECK_FUNC', $row['html_tag'] . ': ' . _AC($row['name'])));
// skip this check
$check_result = true;
}
if ($check_result === true) {
$result = SUCCESS_RESULT;
//MB
// number of success checks
if (isset($this->num_success[$check_id])) {
$this->num_success[$check_id]++;
} else {
$this->num_success[$check_id] = 1;
}
} else {
$result = FAIL_RESULT;
}
if ($result == FAIL_RESULT) {
$preview_html = $e->outertext;
if (strlen($preview_html) > DISPLAY_PREVIEW_HTML_LENGTH) {
$html_code = substr($preview_html, 0, DISPLAY_PREVIEW_HTML_LENGTH) . " ...";
} else {
$html_code = $preview_html;
}
// find out preview images for validation on <img>
if (strtolower(trim($row['html_tag'])) == 'img') {
$image = BasicChecks::getFile($e->attr['src'], $base_href, $this->uri);
// The lines below to check the existence of the image slows down the validation process.
// So commented out.
//$handle = @fopen($image, 'r');
//if (!$handle) $image = '';
//else @fclose($handle);
// find out image alt text for preview image
if (!isset($e->attr['alt'])) {
$image_alt = '_NOT_DEFINED';
} else {
if ($e->attr['alt'] == '') {
$image_alt = '_EMPTY';
} else {
$image_alt = $e->attr['alt'];
}
}
}
// If its a duplicate ID, switch the line number from the element line (body)
// to the line where the duplicate ID appears.
global $has_duplicate_attribute;
if (is_array($has_duplicate_attribute)) {
$line_number = $has_duplicate_attribute[0];
$html_code .= "(" . $has_duplicate_attribute[1] . ")";
}
$this->save_result($line_number, $col_number, $html_code, $check_id, $result, $image, $image_alt, $css_code);
}
}
return $result;
}
