/*
 *  call-seq:
 *    ripper#lineno   -> Integer
 *
 *  Return line number of current parsing line.
 *  This number starts from 1.
 */
static VALUE
ripper_lineno(VALUE self)
{
    struct parser_params *parser;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, parser);
    if (!ripper_initialized_p(parser)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(parser->parsing_thread)) return Qnil;
    return INT2NUM(parser->parser_ruby_sourceline);
}