public static function checkColorContrastForNotVisitedLinkWCAG2AAA()
{
return BasicChecks::checkLinkContrastWcag2AAA("link", "link");
}
public static function checkLinkContrastWcag2AAA($cssPropriety, $bodyAttribute)
{
global $background, $foreground;
global $global_e, $global_content_dom;
global $stringa_testo_prova;
$e = $global_e;
$content_dom = $global_content_dom;
BasicChecks::setCssSelectors($content_dom);
if (!BasicChecks::isElementVisible($e)) {
return true;
}
$background = '';
$foreground = '';
if (trim(BasicChecks::remove_children($e)) == "" || trim(BasicChecks::remove_children($e)) == " ") {
//l'elemento non contiene testo "visibile": non eseguo il controllo del contrasto
// the element has no text "visible": Do not run the contrast control
return true;
}
$foreground = BasicChecks::getForegroundA($e, $cssPropriety);
if ($foreground == "undetermined") {
return true;
}
if (($foreground == "" || $foreground == null) && $bodyAttribute != null) {
$app = $e->parent();
while ($app->tag != "body" && $app->tag != "html" && $app->tag != null) {
$app = $app->parent();
}
if ($app != null && isset($app->attr[$bodyAttribute])) {
$foreground = $app->attr[$bodyAttribute];
}
}
if ($foreground == "undetermined") {
return true;
}
if ($foreground == "" || $foreground == null) {
return true;
}
$background = BasicChecks::getBackgroundA($e, $cssPropriety);
if ($background == "undetermined") {
return true;
}
if ($background == "" || $background == null) {
$background = BasicChecks::getBackground($e);
}
if ($background == "" || $background == null || $background == "-1") {
return true;
}
if ($background == "undetermined") {
return true;
}
$background = BasicChecks::convert_color_to_hex($background);
$foreground = BasicChecks::convert_color_to_hex($foreground);
$ris = '';
$ris = BasicChecks::ContrastRatio(strtolower($background), strtolower($foreground));
//echo "tag->"; echo $e->tag; echo " bg->"; echo $background; echo " fr->"; echo $foreground; echo " ris="; echo $ris; echo "<br>";
$size = BasicChecks::fontSizeToPt($e);
$bold = BasicChecks::get_p_css($e, "font-weight");
if ($size < 0) {
//formato non supportato
return true;
} elseif ($size >= 18 || $bold == "bold" && $size >= 14) {
$threashold = 4.5;
} else {
$threashold = 7;
}
$stringa_testo_prova = '';
$stringa_testo_prova = "<p>ris: " . $ris . " threashold: " . $threashold . "</p>";
if ($ris < $threashold) {
return false;
} else {
return true;
}
return true;
}
/**
* 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;
}