Re: Trailing comments in bison

[Maury Markowitz]

Ok, I managed to get this to work, and ultimately it was quite easy. First you 
do this in flex:

'.*         { yylval.s = g_string_new(strndup(yytext + 1, yyleng - 1)); return 
QUOTEREM; } // short form in MS
!.*         { yylval.s = g_string_new(strndup(yytext + 1, yyleng - 1)); return 
BANGREM; } // later MS allow bang as well

Then in your bison you do this:

statements:
        statement
        {
          $$ = g_list_prepend(NULL, $1);
        }
        |
    statement ':' statements
    {
          $$ = g_list_prepend($3, $1);
    }
    |
    statements QUOTEREM
    {
      $$ = g_list_prepend($1, NULL);
    }
    |
    statements BANGREM
    {
      $$ = g_list_prepend($1, NULL);
    }
        ;

and finally:

    |
    REM
    {
      statement_t *new = make_statement(REM);
      new->parms.rem = yylval.s;
      $$ = new;
    }
    |
    QUOTEREM
    {
      statement_t *new = make_statement(QUOTEREM);
      new->parms.rem = yylval.s;
      $$ = new;
    }
    |
    BANGREM
    {
      statement_t *new = make_statement(BANGREM);
      new->parms.rem = yylval.s;
      $$ = new;
    }

Presto! More work than I would have liked, but doesn't really upset the syntax 
too badly and is still self-documented to a good degree.