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34 lines
843 B
PHP
34 lines
843 B
PHP
<?php
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/**
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* Validates a color according to the HTML spec.
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*/
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class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
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{
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public function validate($string, $config, $context) {
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static $colors = null;
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if ($colors === null) $colors = $config->get('Core.ColorKeywords');
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$string = trim($string);
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if (empty($string)) return false;
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$lower = strtolower($string);
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if (isset($colors[$lower])) return $colors[$lower];
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if ($string[0] === '#') $hex = substr($string, 1);
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else $hex = $string;
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$length = strlen($hex);
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if ($length !== 3 && $length !== 6) return false;
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if (!ctype_xdigit($hex)) return false;
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if ($length === 3) $hex = $hex[0].$hex[0].$hex[1].$hex[1].$hex[2].$hex[2];
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return "#$hex";
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}
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}
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// vim: et sw=4 sts=4
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