/**
* Normalize attribute values.
*
* @param string $source
* @param HtmlTokenizer $tokenizer
* @return mixed
*/
protected function normalizeAttributes($source, HtmlTokenizer $tokenizer)
{
$result = '';
foreach ($tokenizer->parse($source) as $token) {
if (empty($token[HtmlTokenizer::TOKEN_ATTRIBUTES])) {
$result .= $tokenizer->compile($token);
continue;
}
$attributes = [];
foreach ($token[HtmlTokenizer::TOKEN_ATTRIBUTES] as $attribute => $value) {
if (in_array($attribute, $this->options['attributes']['trim'])) {
$value = trim($value);
}
if (empty($value) && in_array($attribute, $this->options['attributes']['drop'])) {
//Empty value
continue;
}
$attributes[$attribute] = $value;
}
$token[HtmlTokenizer::TOKEN_ATTRIBUTES] = $attributes;
$result .= $tokenizer->compile($token);
}
return $result;
}
