if (this.read_mlcomment(stream, tokens)) continue;
if (this.read_slcomment(stream, tokens)) continue;
if (this.read_dbquote(stream, tokens)) continue;
if (this.read_mlcomment(stream, tokens)) continue;
if (this.read_slcomment(stream, tokens)) continue;
if (this.read_dbquote(stream, tokens)) continue;