<?php

/**
 * Validates a color according to the HTML spec.
 */
class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
{

    /**
     * @param string $string
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($string, $config, $context)
    {
        static $colors = null;
        if ($colors === null) {
            $colors = $config->get('Core.ColorKeywords');
        }

        $string = trim($string);

        if (empty($string)) {
            return false;
        }
        $lower = strtolower($string);
        if (isset($colors[$lower])) {
            return $colors[$lower];
        }
        if ($string[0] === '#') {
            $hex = substr($string, 1);
        } else {
            $hex = $string;
        }

        $length = strlen($hex);
        if ($length !== 3 && $length !== 6) {
            return false;
        }
        if (!ctype_xdigit($hex)) {
            return false;
        }
        if ($length === 3) {
            $hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
        }
        return "#$hex";
    }
}

// vim: et sw=4 sts=4

• [F] Bool.php
  Delete
• [F] Class.php
  Delete
• [F] Color.php
  Delete
• [F] ContentEditable.php
  Delete
• [F] FrameTarget.php
  Delete
• [F] ID.php
  Delete
• [F] Length.php
  Delete
• [F] LinkTypes.php
  Delete
• [F] MultiLength.php
  Delete
• [F] Nmtokens.php
  Delete
• [F] Pixels.php
  Delete

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