NameSync.php

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<?php

class HTMLPurifier_AttrTransform_NameSync extends HTMLPurifier_AttrTransform
{

    public function __construct() {
        $this->idDef = new HTMLPurifier_AttrDef_HTML_ID();
    }

    public function transform($attr, $config, $context) {
        if (!isset($attr['name'])) return $attr;
        $name = $attr['name'];
        if (isset($attr['id']) && $attr['id'] === $name) return $attr;
        $result = $this->idDef->validate($name, $config, $context);
        if ($result === false) unset($attr['name']);
        else $attr['name'] = $result;
        return $attr;
    }

}

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