<?php

namespace WPDT;

/**
 * Validates a MultiLength as defined by the HTML spec.
 *
 * A multilength is either a integer (pixel count), a percentage, or
 * a relative number.
 */
class HTMLPurifier_AttrDef_HTML_MultiLength extends \WPDT\HTMLPurifier_AttrDef_HTML_Length
{
    /**
     * @param string $string
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($string, $config, $context)
    {
        $string = \trim($string);
        if ($string === '') {
            return \false;
        }
        $parent_result = parent::validate($string, $config, $context);
        if ($parent_result !== \false) {
            return $parent_result;
        }
        $length = \strlen($string);
        $last_char = $string[$length - 1];
        if ($last_char !== '*') {
            return \false;
        }
        $int = \substr($string, 0, $length - 1);
        if ($int == '') {
            return '*';
        }
        if (!\is_numeric($int)) {
            return \false;
        }
        $int = (int) $int;
        if ($int < 0) {
            return \false;
        }
        if ($int == 0) {
            return '0';
        }
        if ($int == 1) {
            return '*';
        }
        return (string) $int . '*';
    }
}
// vim: et sw=4 sts=4
