Proyectos de Subversion Moodle

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<?php
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/**
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 * Validates Color as defined by CSS.
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 */
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class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
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{
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    /**
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     * @type HTMLPurifier_AttrDef_CSS_AlphaValue
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     */
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    protected $alpha;
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    public function __construct()
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    {
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        $this->alpha = new HTMLPurifier_AttrDef_CSS_AlphaValue();
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    }
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    /**
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     * @param string $color
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return bool|string
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     */
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    public function validate($color, $config, $context)
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    {
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        static $colors = null;
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        if ($colors === null) {
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            $colors = $config->get('Core.ColorKeywords');
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        }
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        $color = trim($color);
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        if ($color === '') {
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            return false;
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        }
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        $lower = strtolower($color);
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        if (isset($colors[$lower])) {
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            return $colors[$lower];
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        }
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        if (preg_match('#(rgb|rgba|hsl|hsla)\(#', $color, $matches) === 1) {
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            $length = strlen($color);
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            if (strpos($color, ')') !== $length - 1) {
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                return false;
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            }
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            // get used function : rgb, rgba, hsl or hsla
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            $function = $matches[1];
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            $parameters_size = 3;
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            $alpha_channel = false;
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            if (substr($function, -1) === 'a') {
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                $parameters_size = 4;
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                $alpha_channel = true;
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            }
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            /*
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             * Allowed types for values :
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             * parameter_position => [type => max_value]
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             */
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            $allowed_types = array(
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                1 => array('percentage' => 100, 'integer' => 255),
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                2 => array('percentage' => 100, 'integer' => 255),
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                3 => array('percentage' => 100, 'integer' => 255),
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            );
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            $allow_different_types = false;
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            if (strpos($function, 'hsl') !== false) {
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                $allowed_types = array(
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                    1 => array('integer' => 360),
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                    2 => array('percentage' => 100),
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                    3 => array('percentage' => 100),
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                );
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                $allow_different_types = true;
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            }
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            $values = trim(str_replace($function, '', $color), ' ()');
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            $parts = explode(',', $values);
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            if (count($parts) !== $parameters_size) {
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                return false;
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            }
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            $type = false;
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            $new_parts = array();
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            $i = 0;
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            foreach ($parts as $part) {
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                $i++;
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                $part = trim($part);
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                if ($part === '') {
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                    return false;
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                }
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                // different check for alpha channel
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                if ($alpha_channel === true && $i === count($parts)) {
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                    $result = $this->alpha->validate($part, $config, $context);
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                    if ($result === false) {
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                        return false;
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                    }
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                    $new_parts[] = (string)$result;
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                    continue;
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                }
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                if (substr($part, -1) === '%') {
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                    $current_type = 'percentage';
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                } else {
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                    $current_type = 'integer';
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                }
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                if (!array_key_exists($current_type, $allowed_types[$i])) {
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                    return false;
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                }
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                if (!$type) {
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                    $type = $current_type;
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                }
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                if ($allow_different_types === false && $type != $current_type) {
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                    return false;
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                }
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                $max_value = $allowed_types[$i][$current_type];
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                if ($current_type == 'integer') {
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                    // Return value between range 0 -> $max_value
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                    $new_parts[] = (int)max(min($part, $max_value), 0);
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                } elseif ($current_type == 'percentage') {
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                    $new_parts[] = (float)max(min(rtrim($part, '%'), $max_value), 0) . '%';
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                }
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            }
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            $new_values = implode(',', $new_parts);
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            $color = $function . '(' . $new_values . ')';
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        } else {
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            // hexadecimal handling
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            if ($color[0] === '#') {
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                $hex = substr($color, 1);
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            } else {
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                $hex = $color;
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                $color = '#' . $color;
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            }
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            $length = strlen($hex);
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            if ($length !== 3 && $length !== 6) {
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                return false;
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            }
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            if (!ctype_xdigit($hex)) {
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                return false;
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            }
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        }
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        return $color;
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    }
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}
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// vim: et sw=4 sts=4