* tests/glr-regr1.at (Badly Collapsed GLR States): Prototype yylex

[bison.git] / tests / glr-regr1.at

# Checking GLR Parsing: Regression Test           -*- Autotest -*-
# Copyright (C) 2002 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

AT_BANNER([[GLR Regression Test #1.]])

AT_SETUP([Badly Collapsed GLR States])

AT_DATA([glr-regr1.y],
[[/* Regression Test: Improper state compression */
/* Reported by Scott McPeak */

%{
#include <stdio.h>    // fgetc, printf

#define YYSTYPE int
static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1);
int yylex (void);
int yyerror (char const *msg);
%}


%glr-parser


/* -------- productions ------ */
%%

StartSymbol: E  { $$=0; }                   %merge <exprMerge>
           ;

E: E 'P' E { $$=1; printf("E -> E 'P' E\n"); }  %merge <exprMerge>
 | 'B'     { $$=2; printf("E -> 'B'\n"); }      %merge <exprMerge>
 ;



/* ---------- C code ----------- */
%%

static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1)
{
  (void) x0;
  (void) x1;
  printf ("<OR>\n");
  return 0;
}

int
main (void)
{
  yyparse();
  return 0;
}

int
yyerror (char const *msg)
{
  printf("%s\n", msg);
  exit(4);
}


int
yylex (void)
{
  while (1) {
    int ch = fgetc(stdin);
    if (ch == EOF) {
      return 0;   // bison's EOF
    } else if (ch == 'B' || ch == 'P') {
      return ch;
    }
  }
}
]])

AT_CHECK([[bison -o glr-regr1.c glr-regr1.y]], 0, [],
[glr-regr1.y: warning: 1 shift/reduce conflict
])
AT_COMPILE([glr-regr1])
AT_CHECK([[echo BPBPB | ./glr-regr1]], 0,
[[E -> 'B'
E -> 'B'
E -> E 'P' E
E -> 'B'
E -> E 'P' E
E -> 'B'
E -> E 'P' E
E -> E 'P' E
<OR>
]], [])

AT_CLEANUP