* doc/bison.texinfo (Stack Overflow): xref to Recursion.

[bison.git] / tests / input.at

# Checking the output filenames.                    -*- 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([[Input Processing.]])

# Mostly test that we are robust to mistakes.


## ------------ ##
## Invalid $n.  ##
## ------------ ##

AT_SETUP([Invalid $n])

AT_DATA([input.y],
[[%%
exp: { $$ = $1 ; };
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:2.6-14: invalid value: $1
]])

AT_CLEANUP


## ------------ ##
## Invalid @n.  ##
## ------------ ##

AT_SETUP([Invalid @n])

AT_DATA([input.y],
[[%%
exp: { @$ = @1 ; };
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:2.6-14: invalid value: @1
]])

AT_CLEANUP


## -------------- ##
## Type Clashes.  ##
## -------------- ##

AT_SETUP([Type Clashes])

AT_DATA([input.y],
[[%token foo
%type <bar> exp
%%
exp: foo {} foo
   | foo
   | /* Empty. */
   ;
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:4.4-15: type clash (`bar' `') on default action
input.y:5.4-8: type clash (`bar' `') on default action
input.y:6.4: empty rule for typed nonterminal, and no action
]])

AT_CLEANUP



## ----------------------- ##
## Torturing the Scanner.  ##
## ----------------------- ##

# Be sure to compile and run, so that the C compiler checks what
# we do.

AT_SETUP([Torturing the Scanner])

AT_DATA([input.y],
[[%{
/* This is seen in GCC: a %{ and %} in middle of a comment. */
const char *foo = "So %{ and %} can be here too.";

#include <stdio.h>
%}
/* %{ and %} can be here too. */

%{
/* Exercise pre-prologue dependency to %union.  */
typedef int value_t;
%}

/* Exercise M4 quoting: '@:>@@:>@', 0.  */

/* Also exercise %union. */
%union
{
  value_t ival; /* A comment to exercise an old bug. */
};


/* Exercise post-prologue dependency to %union.  */
%{
static YYSTYPE value_t_as_yystype (value_t val);

/* Exercise quotes in declarations.  */
char quote[] = "@:>@@:>@,";
%}

%{
static void yyerror (const char *s);
static int yylex (void);
%}

%type <ival> '1'

/* Exercise quotes in strings.  */
%token FAKE "fake @<:@@:>@,"

%%
/* Exercise M4 quoting: '@:>@@:>@', 1.  */
exp: '1'
  {
    /* Exercise quotes in braces.  */
    char tmp[] = "@<:@%c@:>@,\n";
    printf (tmp, $1);
  }
;
%%
/* Exercise M4 quoting: '@:>@@:>@', 2.  */

static YYSTYPE
value_t_as_yystype (value_t val)
{
  YYSTYPE res;
  res.ival = val;
  return res;
}

static int
yylex (void)
{
  static const char *input = "1";
  yylval = value_t_as_yystype (*input);
  return *input++;
}

static void
yyerror (const char *msg)
{
  fprintf (stderr, "%s\n", msg);
}
]])

AT_DATA([main.c],
[[typedef int value_t;
#include "input.h"

int yyparse (void);

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

AT_CHECK([bison input.y -d -v -o input.c])
AT_COMPILE([input], [input.c main.c])
AT_PARSER_CHECK([./input], 0,
[[[1],
]])

AT_CLEANUP