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);
    }
}