if (this.read_regx(stream, tokens)) continue;
if (this.read_numb(stream, tokens)) continue;
if (this.read_punc(stream, tokens)) continue;
+ if(typeof(tokens) == 'undefined') {console.log('empty????');}
if (this.read_newline(stream, tokens)) continue;
if (this.read_space(stream, tokens)) continue;
if (this.read_word(stream, tokens)) continue;