FrameTarget.php

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<?php

class HTMLPurifier_AttrDef_HTML_FrameTarget extends HTMLPurifier_AttrDef_Enum
{

    public $valid_values = false; // uninitialized value

    protected $case_sensitive = false;

    public function __construct()
    {
    }

    public function validate($string, $config, $context)
    {
        if ($this->valid_values === false) {
            $this->valid_values = $config->get('Attr.AllowedFrameTargets');
        }
        return parent::validate($string, $config, $context);
    }
}

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