<?php

namespace WPDT;

/**
 * Microsoft's proprietary filter: CSS property
 * @note Currently supports the alpha filter. In the future, this will
 *       probably need an extensible framework
 */
class HTMLPurifier_AttrDef_CSS_Filter extends \WPDT\HTMLPurifier_AttrDef
{
    /**
     * @type HTMLPurifier_AttrDef_Integer
     */
    protected $intValidator;
    public function __construct()
    {
        $this->intValidator = new \WPDT\HTMLPurifier_AttrDef_Integer();
    }
    /**
     * @param string $value
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($value, $config, $context)
    {
        $value = $this->parseCDATA($value);
        if ($value === 'none') {
            return $value;
        }
        // if we looped this we could support multiple filters
        $function_length = \strcspn($value, '(');
        $function = \trim(\substr($value, 0, $function_length));
        if ($function !== 'alpha' && $function !== 'Alpha' && $function !== 'progid:DXImageTransform.Microsoft.Alpha') {
            return \false;
        }
        $cursor = $function_length + 1;
        $parameters_length = \strcspn($value, ')', $cursor);
        $parameters = \substr($value, $cursor, $parameters_length);
        $params = \explode(',', $parameters);
        $ret_params = array();
        $lookup = array();
        foreach ($params as $param) {
            list($key, $value) = \explode('=', $param);
            $key = \trim($key);
            $value = \trim($value);
            if (isset($lookup[$key])) {
                continue;
            }
            if ($key !== 'opacity') {
                continue;
            }
            $value = $this->intValidator->validate($value, $config, $context);
            if ($value === \false) {
                continue;
            }
            $int = (int) $value;
            if ($int > 100) {
                $value = '100';
            }
            if ($int < 0) {
                $value = '0';
            }
            $ret_params[] = "{$key}={$value}";
            $lookup[$key] = \true;
        }
        $ret_parameters = \implode(',', $ret_params);
        $ret_function = "{$function}({$ret_parameters})";
        return $ret_function;
    }
}
// vim: et sw=4 sts=4
