Flow\JSONPath\JSONPath::parseTokens PHP Method

    public function parseTokens($expression)
    {
        $cacheKey = md5($expression);
        if (isset(static::$tokenCache[$cacheKey])) {
            return static::$tokenCache[$cacheKey];
        }
        $lexer = new JSONPathLexer($expression);
        $tokens = $lexer->parseExpression();
        static::$tokenCache[$cacheKey] = $tokens;
        return $tokens;
    }