class.ilDclTokenizer.php

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<?php

class ilDclTokenizer {

        public static function getTokens($expression) {
                $expression = ltrim($expression, '=');
                $expression = trim($expression);
                preg_match_all("/([^\\\\&]|\\\\&)*/ui", $expression, $matches);

                $results = $matches[0];

                $return = array();
                foreach ($results as $r) {
                        if (!$r) {
                                continue;
                        }
                        $return[] = str_ireplace('\&', '&', $r);
                }

                return array_map('trim', $return);
        }


        public static function getMathTokens($math_expression) {
                $operators = array_keys(ilDclExpressionParser::getOperators());
                $pattern = '#((^\[\[)[\d\.]+)|(\(|\)|\\' . implode("|\\", $operators) . ')#';
                $tokens = preg_split($pattern, $math_expression, - 1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);

                return array_map('trim', $tokens);
        }
}

?>