* src/reduce.c (nonterminals_reduce): Instead of throwing away

[bison.git] / tests / regression.at

# Bison Regressions.                               -*- Autotest -*-
# Copyright 2001 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([[Regression tests.]])

## ------------------ ##
## Duplicate string.  ##
## ------------------ ##


AT_SETUP([Duplicate string])

AT_DATA([duplicate.y],
[[/* `Bison -v' used to dump core when two tokens are defined with the same
   string, as LE and GE below. */

%token NUM
%token LE "<="
%token GE "<="

%%
exp: '(' exp ')' | NUM ;
%%
]])

AT_CHECK([bison -v duplicate.y -o duplicate.c], 0, ignore, ignore)

AT_CLEANUP


## ------------------------- ##
## Unresolved SR Conflicts.  ##
## ------------------------- ##

AT_SETUP([Unresolved SR Conflicts])

AT_DATA([input.y],
[[%token NUM OP
%%
exp: exp OP exp | NUM;
]])

AT_CHECK([bison input.y -o input.c -v], 0, [],
[input.y contains 1 shift/reduce conflict.
])

# Check the contents of the report.
AT_CHECK([cat input.output], [],
[[State 4 contains 1 shift/reduce conflict.

Grammar

  Number, Line, Rule
    1   3 exp -> exp OP exp
    2   3 exp -> NUM

Terminals, with rules where they appear

$ (-1)
error (256)
NUM (257) 2
OP (258) 1

Nonterminals, with rules where they appear

exp (5)
    on left: 1 2, on right: 1


state 0

    NUM 	shift, and go to state 1

    exp 	go to state 2



state 1

    exp  ->  NUM .   (rule 2)

    $default	reduce using rule 2 (exp)



state 2

    exp  ->  exp . OP exp   (rule 1)

    $   	go to state 5
    OP  	shift, and go to state 3



state 3

    exp  ->  exp OP . exp   (rule 1)

    NUM 	shift, and go to state 1

    exp 	go to state 4



state 4

    exp  ->  exp . OP exp   (rule 1)
    exp  ->  exp OP exp .   (rule 1)

    OP  	shift, and go to state 3

    OP  	[reduce using rule 1 (exp)]
    $default	reduce using rule 1 (exp)



state 5

    $   	go to state 6



state 6

    $default	accept
]])

AT_CLEANUP


## --------------------- ##
## Solved SR Conflicts.  ##
## --------------------- ##

AT_SETUP([Solved SR Conflicts])

AT_DATA([input.y],
[[%token NUM OP
%right OP
%%
exp: exp OP exp | NUM;
]])

AT_CHECK([bison input.y -o input.c -v], 0, [], [])

# Check the contents of the report.
AT_CHECK([cat input.output], [],
[[Conflict in state 4 between rule 1 and token OP resolved as shift.

Grammar

  Number, Line, Rule
    1   4 exp -> exp OP exp
    2   4 exp -> NUM

Terminals, with rules where they appear

$ (-1)
error (256)
NUM (257) 2
OP (258) 1

Nonterminals, with rules where they appear

exp (5)
    on left: 1 2, on right: 1


state 0

    NUM 	shift, and go to state 1

    exp 	go to state 2



state 1

    exp  ->  NUM .   (rule 2)

    $default	reduce using rule 2 (exp)



state 2

    exp  ->  exp . OP exp   (rule 1)

    $   	go to state 5
    OP  	shift, and go to state 3



state 3

    exp  ->  exp OP . exp   (rule 1)

    NUM 	shift, and go to state 1

    exp 	go to state 4



state 4

    exp  ->  exp . OP exp   (rule 1)
    exp  ->  exp OP exp .   (rule 1)

    OP  	shift, and go to state 3

    $default	reduce using rule 1 (exp)



state 5

    $   	go to state 6



state 6

    $default	accept
]])

AT_CLEANUP




## ------------------- ##
## Rule Line Numbers.  ##
## ------------------- ##

AT_SETUP([Rule Line Numbers])

AT_DATA([input.y],
[[%%
expr:
'a'

{

}

'b'

{

}

|


{


}

'c'

{

}
]])

AT_CHECK([bison input.y -o input.c -v], 0, [], [])

# Check the contents of the report.
AT_CHECK([cat input.output], [],
[[
Grammar

  Number, Line, Rule
    1   2 @1 -> /* empty */
    2   2 expr -> 'a' @1 'b'
    3  15 @2 -> /* empty */
    4  15 expr -> @2 'c'

Terminals, with rules where they appear

$ (-1)
'a' (97) 2
'b' (98) 2
'c' (99) 4
error (256)

Nonterminals, with rules where they appear

expr (6)
    on left: 2 4
@1 (7)
    on left: 1, on right: 2
@2 (8)
    on left: 3, on right: 4


state 0

    'a' 	shift, and go to state 1

    $default	reduce using rule 3 (@2)

    expr	go to state 6
    @2  	go to state 2



state 1

    expr  ->  'a' . @1 'b'   (rule 2)

    $default	reduce using rule 1 (@1)

    @1  	go to state 3



state 2

    expr  ->  @2 . 'c'   (rule 4)

    'c' 	shift, and go to state 4



state 3

    expr  ->  'a' @1 . 'b'   (rule 2)

    'b' 	shift, and go to state 5



state 4

    expr  ->  @2 'c' .   (rule 4)

    $default	reduce using rule 4 (expr)



state 5

    expr  ->  'a' @1 'b' .   (rule 2)

    $default	reduce using rule 2 (expr)



state 6

    $   	go to state 7



state 7

    $   	go to state 8



state 8

    $default	accept
]])

AT_CLEANUP



## -------------------- ##
## %expect not enough.  ##
## -------------------- ##

AT_SETUP([%expect not enough])

AT_DATA([input.y],
[[%token NUM OP
%expect 0
%%
exp: exp OP exp | NUM;
]])

AT_CHECK([bison input.y -o input.c], 1, [],
[input.y contains 1 shift/reduce conflict.
expected 0 shift/reduce conflicts
])
AT_CLEANUP


## --------------- ##
## %expect right.  ##
## --------------- ##

AT_SETUP([%expect right])

AT_DATA([input.y],
[[%token NUM OP
%expect 1
%%
exp: exp OP exp | NUM;
]])

AT_CHECK([bison input.y -o input.c], 0)
AT_CLEANUP


## ------------------ ##
## %expect too much.  ##
## ------------------ ##

AT_SETUP([%expect too much])

AT_DATA([input.y],
[[%token NUM OP
%expect 2
%%
exp: exp OP exp | NUM;
]])

AT_CHECK([bison input.y -o input.c], 1, [],
[input.y contains 1 shift/reduce conflict.
expected 2 shift/reduce conflicts
])
AT_CLEANUP


## ---------------------- ##
## Mixing %token styles.  ##
## ---------------------- ##


AT_SETUP([Mixing %token styles])

# Taken from the documentation.
AT_DATA([input.y],
[[%token  <operator>  OR      "||"
%token  <operator>  LE 134  "<="
%left  OR  "<="
%%
exp: ;
%%
]])

AT_CHECK([bison -v input.y -o input.c], 0, ignore, ignore)

AT_CLEANUP



## ---------------------- ##
## %union and --defines.  ##
## ---------------------- ##


AT_SETUP([%union and --defines])

AT_DATA([union.y],
[%union
{
  int   integer;
  char *string ;
}
%%
exp: {};
])

AT_CHECK([bison --defines union.y])

AT_CLEANUP


## --------------------------------------- ##
## Duplicate '/' in C comments in %union   ##
## --------------------------------------- ##


AT_SETUP([%union and C comments])

AT_DATA([union-comment.y],
[%union
{
  /* The int.  */	int   integer;
  /* The string.  */	char *string ;
}
%%
exp: {};
])

AT_CHECK([bison union-comment.y])
AT_CHECK([fgrep '//*' union-comment.tab.c], [1], [])

AT_CLEANUP


## ----------------- ##
## Invalid input 1.  ##
## ----------------- ##


AT_SETUP([Invalid input: 1])

AT_DATA([input.y],
[[%%
?
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:2: invalid input: `?'
input.y:3: fatal error: no rules in the input grammar
]])

AT_CLEANUP


## ----------------- ##
## Invalid input 2.  ##
## ----------------- ##


AT_SETUP([Invalid input: 2])

AT_DATA([input.y],
[[%%
default: 'a' }
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:2: invalid input: `}'
]])

AT_CLEANUP



## -------------------- ##
## Invalid %directive.  ##
## -------------------- ##


AT_SETUP([Invalid %directive])

AT_DATA([input.y],
[[%invalid
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:1: unrecognized: %invalid
input.y:1:    Skipping to next %
input.y:2: fatal error: no input grammar
]])

AT_CLEANUP



## --------------------- ##
## Invalid CPP headers.  ##
## --------------------- ##

# AT_TEST_CPP_GUARD_H([INPUT-FILE-BASE)
# -------------------------------------
m4_define([AT_TEST_CPP_GUARD_H],
[AT_SETUP([Invalid CPP guards: $1])

# Possibly create inner directories.
dirname=`AS_DIRNAME([$1])`
AS_MKDIR_P([$dirname])

AT_DATA([$1.y],
[%%
dummy:
])

AT_CHECK([bison --defines=$1.h $1.y])

# CPP should be happy with it.
AT_CHECK([$CC -E $1.h], 0, [ignore])

AT_CLEANUP
])

AT_TEST_CPP_GUARD_H([input/input])
AT_TEST_CPP_GUARD_H([9foo])