[bison.git] / tests / input.at

# Checking the Bison scanner.                    -*- Autotest -*-

# Copyright (C) 2002-2013 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.

AT_BANNER([[Input Processing.]])

# Mostly test that we are robust to mistakes.


## ----------------- ##
## Invalid options.  ##
## ----------------- ##

AT_SETUP([Invalid options])

AT_DATA([input.y],
[[%%
exp: '0'
]])

# We used to accept these, as -f, --report and others were sharing
# their code with -W.
AT_BISON_CHECK([-ferror=caret input.y], [1], [], [ignore])
AT_BISON_CHECK([--report=error=itemsets input.y], [1], [], [ignore])

# We used to accept any character after "-Werror", instead of ensuring
# this is "=".
AT_BISON_CHECK([-Werror?all input.y], [1], [], [ignore])

AT_CLEANUP


## ---------------- ##
## Invalid inputs.  ##
## ---------------- ##

AT_SETUP([Invalid inputs])

AT_DATA([input.y],
[[\000\001\002\377?
%%
?
default: 'a' }
%&
%a-does-not-exist
%-
%{
]])
AT_CHECK([[$PERL -pi -e 's/\\(\d{3})/chr(oct($1))/ge' input.y || exit 77]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:1.1-2: error: invalid characters: '\0\001\002\377?'
input.y:3.1: error: invalid character: '?'
input.y:4.14: error: invalid character: '}'
input.y:5.1: error: invalid character: '%'
input.y:5.2: error: invalid character: '&'
input.y:6.1-17: error: invalid directive: '%a-does-not-exist'
input.y:7.1: error: invalid character: '%'
input.y:7.2: error: invalid character: '-'
input.y:8.1-9.0: error: missing '%}' at end of file
input.y:8.1-9.0: error: syntax error, unexpected %{...%}
]])

AT_CLEANUP


AT_SETUP([Invalid inputs with {}])

# We used to SEGV here.  See
# http://lists.gnu.org/archive/html/bug-bison/2005-07/msg00053.html

AT_DATA([input.y],
[[
%destructor
%initial-action
%lex-param
%parse-param
%printer
%union
]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:3.1-15: error: syntax error, unexpected %initial-action, expecting {...}
]])

AT_CLEANUP


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

AT_SETUP([Invalid $n and @n])

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

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.13-14: error: integer out of range: '$1'
 exp: { $$ = $1 ; };
             ^^
input.y:3.13-14: error: integer out of range: '@1'
 exp: { @$ = @1 ; };
             ^^
]])

AT_CLEANUP


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

AT_SETUP([Type Clashes])

AT_DATA([input.y],
[[%union { int bar; }
%token foo
%type <bar> exp
%%
exp: foo { $$; } foo { $2; } foo
   | foo
   | /* empty. */
   ;
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:5.12-13: error: $$ for the midrule at $2 of 'exp' has no declared type
 exp: foo { $$; } foo { $2; } foo
            ^^
input.y:5.24-25: error: $2 of 'exp' has no declared type
 exp: foo { $$; } foo { $2; } foo
                        ^^
input.y:5.6-32: warning: type clash on default action: <bar> != <> [-Wother]
 exp: foo { $$; } foo { $2; } foo
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:6.6-8: warning: type clash on default action: <bar> != <> [-Wother]
    | foo
      ^^^
input.y:7.5: warning: empty rule for typed nonterminal, and no action [-Wother]
    | /* empty. */
     ^
]])

AT_CLEANUP


# _AT_UNUSED_VALUES_DECLARATIONS()
# --------------------------------
# Generate the token, type, and destructor
# declarations for the unused values tests.
m4_define([_AT_UNUSED_VALUES_DECLARATIONS],
[[[%token <integer> INT;
%type <integer> a b c d e f g h i j k l;
%destructor { destroy ($$); } INT a b c d e f g h i j k l;]]])


# AT_CHECK_UNUSED_VALUES(DECLARATIONS_AFTER, CHECK_MIDRULE_VALUES)
# ----------------------------------------------------------------
# Generate a grammar to test unused values, compile it, run it.  If
# DECLARATIONS_AFTER is set, then the token, type, and destructor
# declarations are generated after the rules rather than before.  If
# CHECK_MIDRULE_VALUES is set, then --warnings=midrule-values is set.
m4_define([AT_CHECK_UNUSED_VALUES],
[AT_DATA([input.y],
m4_ifval($1, [


], [_AT_UNUSED_VALUES_DECLARATIONS
])[[%%
start:
  'a' a { $]2[; } | 'b' b { $]2[; } | 'c' c { $]2[; } | 'd' d { $]2[; }
| 'e' e { $]2[; } | 'f' f { $]2[; } | 'g' g { $]2[; } | 'h' h { $]2[; }
| 'i' i { $]2[; } | 'j' j { $]2[; } | 'k' k { $]2[; } | 'l' l { $]2[; }
;

a: INT | INT { } INT { } INT { };
b: INT | /* empty */;
c: INT | INT { $]1[; } INT { $<integer>2; } INT { $<integer>4; };
d: INT | INT { } INT { $]1[; } INT { $<integer>2; };
e: INT | INT { } INT {  } INT { $]1[; };
f: INT | INT { } INT {  } INT { $]$[ = $]1[ + $]3[ + $]5[; };
g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
i: INT | INT INT { } { $]$[ = $]1[ + $]2[; };
j: INT | INT INT { $<integer>$ = 1; } { $]$[ = $]1[ + $]2[; };
k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
l: INT | INT { $<integer>$ = $<integer>1; } INT { $<integer>$ = $<integer>2 + $<integer>3; } INT { $<integer>$ = $<integer>4 + $<integer>5; };]]m4_ifval($1, [
_AT_UNUSED_VALUES_DECLARATIONS])
)

AT_BISON_CHECK(m4_ifval($2, [--warnings=midrule-values ])[-fcaret input.y],
               [0], [],
[[input.y:11.10-32: warning: unset value: $][$ [-Wother]
 a: INT | INT { } INT { } INT { };
          ^^^^^^^^^^^^^^^^^^^^^^^
input.y:11.10-12: warning: unused value: $][1 [-Wother]
 a: INT | INT { } INT { } INT { };
          ^^^
input.y:11.18-20: warning: unused value: $][3 [-Wother]
 a: INT | INT { } INT { } INT { };
                  ^^^
input.y:11.26-28: warning: unused value: $][5 [-Wother]
 a: INT | INT { } INT { } INT { };
                          ^^^
input.y:12.9: warning: empty rule for typed nonterminal, and no action [-Wother]
 b: INT | /* empty */;
         ^
]]m4_ifval($2, [[[input.y:13.14-20: warning: unset value: $][$ [-Wmidrule-values]
 c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
              ^^^^^^^
input.y:13.26-41: warning: unset value: $][$ [-Wmidrule-values]
 c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
                          ^^^^^^^^^^^^^^^^
]]])[[input.y:13.10-62: warning: unset value: $][$ [-Wother]
 c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:13.22-24: warning: unused value: $][3 [-Wother]
 c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
                      ^^^
input.y:13.43-45: warning: unused value: $][5 [-Wother]
 c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
                                           ^^^
]]m4_ifval($2, [[[input.y:14.14-16: warning: unset value: $][$ [-Wmidrule-values]
 d: INT | INT { } INT { $][1; } INT { $<integer>2; };
              ^^^
]]])[[input.y:14.10-49: warning: unset value: $][$ [-Wother]
 d: INT | INT { } INT { $][1; } INT { $<integer>2; };
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:14.18-20: warning: unused value: $][3 [-Wother]
 d: INT | INT { } INT { $][1; } INT { $<integer>2; };
                  ^^^
input.y:14.30-32: warning: unused value: $][5 [-Wother]
 d: INT | INT { } INT { $][1; } INT { $<integer>2; };
                              ^^^
input.y:15.10-37: warning: unset value: $][$ [-Wother]
 e: INT | INT { } INT {  } INT { $][1; };
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:15.18-20: warning: unused value: $][3 [-Wother]
 e: INT | INT { } INT {  } INT { $][1; };
                  ^^^
input.y:15.27-29: warning: unused value: $][5 [-Wother]
 e: INT | INT { } INT {  } INT { $][1; };
                           ^^^
input.y:17.10-58: warning: unset value: $][$ [-Wother]
 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:17.10-12: warning: unused value: $][1 [-Wother]
 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
          ^^^
]]m4_ifval($2, [[[input.y:17.14-29: warning: unused value: $][2 [-Wmidrule-values]
 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
              ^^^^^^^^^^^^^^^^
]]])[[input.y:17.31-33: warning: unused value: $][3 [-Wother]
 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
                               ^^^
]]m4_ifval($2, [[[input.y:17.35-50: warning: unused value: $][4 [-Wmidrule-values]
 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
                                   ^^^^^^^^^^^^^^^^
]]])[[input.y:17.52-54: warning: unused value: $][5 [-Wother]
 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
                                                    ^^^
input.y:18.10-72: warning: unset value: $][$ [-Wother]
 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:18.10-12: warning: unused value: $][1 [-Wother]
 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
          ^^^
input.y:18.31-33: warning: unused value: $][3 [-Wother]
 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
                               ^^^
]]m4_ifval($2, [[[input.y:18.35-64: warning: unused value: $][4 [-Wmidrule-values]
 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
]]])[[input.y:18.66-68: warning: unused value: $][5 [-Wother]
 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
                                                                  ^^^
]]m4_ifval($2, [[[input.y:20.18-37: warning: unused value: $][3 [-Wmidrule-values]
 j: INT | INT INT { $<integer>$ = 1; } { $][$ = $][1 + $][2; };
                  ^^^^^^^^^^^^^^^^^^^^
]]])[[input.y:21.10-68: warning: unset value: $][$ [-Wother]
 k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:21.10-12: warning: unused value: $][1 [-Wother]
 k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
          ^^^
input.y:21.14-16: warning: unused value: $][2 [-Wother]
 k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
              ^^^
]]m4_ifval($2, [[[input.y:21.35-64: warning: unused value: $][4 [-Wmidrule-values]
 k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
]]]))
])

## --------------- ##
## Unused values.  ##
## --------------- ##

AT_SETUP([Unused values])
AT_CHECK_UNUSED_VALUES
AT_CHECK_UNUSED_VALUES(, [1])
AT_CLEANUP


## ------------------------------------------ ##
## Unused values before symbol declarations.  ##
## ------------------------------------------ ##

AT_SETUP([Unused values before symbol declarations])
AT_CHECK_UNUSED_VALUES([1])
AT_CHECK_UNUSED_VALUES([1], [1])
AT_CLEANUP


## --------------------------------------------- ##
## Default %printer and %destructor redeclared.  ##
## --------------------------------------------- ##

AT_SETUP([Default %printer and %destructor redeclared])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <*> <*>
%printer { print ($$); } <*> <*>

%destructor { destroy ($$); } <*>
%printer { print ($$); } <*>

%destructor { destroy ($$); } <> <>
%printer { print ($$); } <> <>

%destructor { destroy ($$); } <>
%printer { print ($$); } <>

%%

start: ;

%destructor { destroy ($$); } <*>;
%printer { print ($$); } <*>;

%destructor { destroy ($$); } <>;
%printer { print ($$); } <>;
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:1.13-29: error: %destructor redeclaration for <*>
 %destructor { destroy ($$); } <*> <*>
             ^^^^^^^^^^^^^^^^^
input.y:1.13-29:     previous declaration
 %destructor { destroy ($$); } <*> <*>
             ^^^^^^^^^^^^^^^^^
input.y:2.10-24: error: %printer redeclaration for <*>
 %printer { print ($$); } <*> <*>
          ^^^^^^^^^^^^^^^
input.y:2.10-24:     previous declaration
 %printer { print ($$); } <*> <*>
          ^^^^^^^^^^^^^^^
input.y:4.13-29: error: %destructor redeclaration for <*>
 %destructor { destroy ($$); } <*>
             ^^^^^^^^^^^^^^^^^
input.y:1.13-29:     previous declaration
 %destructor { destroy ($$); } <*> <*>
             ^^^^^^^^^^^^^^^^^
input.y:5.10-24: error: %printer redeclaration for <*>
 %printer { print ($$); } <*>
          ^^^^^^^^^^^^^^^
input.y:2.10-24:     previous declaration
 %printer { print ($$); } <*> <*>
          ^^^^^^^^^^^^^^^
input.y:7.13-29: error: %destructor redeclaration for <>
 %destructor { destroy ($$); } <> <>
             ^^^^^^^^^^^^^^^^^
input.y:7.13-29:     previous declaration
 %destructor { destroy ($$); } <> <>
             ^^^^^^^^^^^^^^^^^
input.y:8.10-24: error: %printer redeclaration for <>
 %printer { print ($$); } <> <>
          ^^^^^^^^^^^^^^^
input.y:8.10-24:     previous declaration
 %printer { print ($$); } <> <>
          ^^^^^^^^^^^^^^^
input.y:10.13-29: error: %destructor redeclaration for <>
 %destructor { destroy ($$); } <>
             ^^^^^^^^^^^^^^^^^
input.y:7.13-29:      previous declaration
 %destructor { destroy ($$); } <> <>
             ^^^^^^^^^^^^^^^^^
input.y:11.10-24: error: %printer redeclaration for <>
 %printer { print ($$); } <>
          ^^^^^^^^^^^^^^^
input.y:8.10-24:      previous declaration
 %printer { print ($$); } <> <>
          ^^^^^^^^^^^^^^^
input.y:17.13-29: error: %destructor redeclaration for <*>
 %destructor { destroy ($$); } <*>;
             ^^^^^^^^^^^^^^^^^
input.y:4.13-29:      previous declaration
 %destructor { destroy ($$); } <*>
             ^^^^^^^^^^^^^^^^^
input.y:18.10-24: error: %printer redeclaration for <*>
 %printer { print ($$); } <*>;
          ^^^^^^^^^^^^^^^
input.y:5.10-24:      previous declaration
 %printer { print ($$); } <*>
          ^^^^^^^^^^^^^^^
input.y:20.13-29: error: %destructor redeclaration for <>
 %destructor { destroy ($$); } <>;
             ^^^^^^^^^^^^^^^^^
input.y:10.13-29:     previous declaration
 %destructor { destroy ($$); } <>
             ^^^^^^^^^^^^^^^^^
input.y:21.10-24: error: %printer redeclaration for <>
 %printer { print ($$); } <>;
          ^^^^^^^^^^^^^^^
input.y:11.10-24:     previous declaration
 %printer { print ($$); } <>
          ^^^^^^^^^^^^^^^
]])

AT_CLEANUP


## ---------------------------------------------- ##
## Per-type %printer and %destructor redeclared.  ##
## ---------------------------------------------- ##

AT_SETUP([Per-type %printer and %destructor redeclared])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <field1> <field2>
%printer { print ($$); } <field1> <field2>

%destructor { destroy ($$); } <field1> <field1>
%printer { print ($$); } <field2> <field2>

%%

start: ;

%destructor { destroy ($$); } <field2> <field1>;
%printer { print ($$); } <field2> <field1>;
]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:4.13-29: error: %destructor redeclaration for <field1>
input.y:1.13-29:     previous declaration
input.y:4.13-29: error: %destructor redeclaration for <field1>
input.y:4.13-29:     previous declaration
input.y:5.10-24: error: %printer redeclaration for <field2>
input.y:2.10-24:     previous declaration
input.y:5.10-24: error: %printer redeclaration for <field2>
input.y:5.10-24:     previous declaration
input.y:11.13-29: error: %destructor redeclaration for <field2>
input.y:1.13-29:      previous declaration
input.y:11.13-29: error: %destructor redeclaration for <field1>
input.y:4.13-29:      previous declaration
input.y:12.10-24: error: %printer redeclaration for <field2>
input.y:5.10-24:      previous declaration
input.y:12.10-24: error: %printer redeclaration for <field1>
input.y:2.10-24:      previous declaration
]])

AT_CLEANUP

## ------------------- ##
## Undefined symbols.  ##
## ------------------- ##

AT_SETUP([Undefined symbols])

AT_DATA([[input.y]],
[[%printer {} foo baz
%destructor {} bar
%type <foo> qux
%%
exp: bar;
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.16-18: error: symbol bar is used, but is not defined as a token and has no rules
 %destructor {} bar
                ^^^
input.y:1.17-19: warning: symbol baz is used, but is not defined as a token and has no rules [-Wother]
 %printer {} foo baz
                 ^^^
input.y:1.13-15: warning: symbol foo is used, but is not defined as a token and has no rules [-Wother]
 %printer {} foo baz
             ^^^
input.y:3.13-15: warning: symbol qux is used, but is not defined as a token and has no rules [-Wother]
 %type <foo> qux
             ^^^
]])

AT_CLEANUP


## ----------------------------------------------------- ##
## Unassociated types used for a printer or destructor.  ##
## ----------------------------------------------------- ##

AT_SETUP([Unassociated types used for a printer or destructor])

AT_DATA([[input.y]],
[[%token <type1> tag1
%type <type2> tag2

%printer { } <type1> <type3>
%destructor { } <type2> <type4>

%%

exp: tag1 { $1; }
   | tag2 { $1; }

tag2: "a" { $$; }
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:4.22-28: warning: type <type3> is used, but is not associated to any symbol [-Wother]
input.y:5.25-31: warning: type <type4> is used, but is not associated to any symbol [-Wother]
]])

AT_CLEANUP


## --------------------------------- ##
## Useless printers or destructors.  ##
## --------------------------------- ##

AT_SETUP([Useless printers or destructors])

# AT_TEST([INPUT], [STDERR])
# --------------------------
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[$1
])
AT_BISON_CHECK([input.y], [0], [], [$2
])])

AT_TEST([[%token <type1> token1
%token <type2> token2
%token <type3> token3
%token <type4> token4
%token <type5> token51 token52
%token <type6> token61 token62
%token <type7> token7

%printer {} token1
%destructor {} token2
%printer {} token51
%destructor {} token61

%printer {} token7

%printer {} <type1>
%destructor {} <type2>
%printer {} <type3>
%destructor {} <type4>

%printer {} <type5>
%destructor {} <type6>

%destructor {} <type7>

%%
exp: "a";]],
[[input.y:16.13-19: warning: useless %printer for type <type1> [-Wother]
input.y:17.16-22: warning: useless %destructor for type <type2> [-Wother]]])

# If everybody is typed, <> is useless.
AT_TEST([[%type <type> exp
%token <type> a
%printer {} <> <*>
%%
exp: a;]],
[[input.y:3.13-14: warning: useless %printer for type <> [-Wother]]])

# If nobody is typed, <*> is useless.
AT_TEST([[%token a
%printer {} <> <*>
%%
exp: a;]],
[[input.y:2.16-18: warning: useless %printer for type <*> [-Wother]]])

m4_popdef([AT_TEST])

AT_CLEANUP


## ---------------------------------------- ##
## Unused values with default %destructor.  ##
## ---------------------------------------- ##

AT_SETUP([Unused values with default %destructor])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <>
%type <tag> tagged

%%

start: end end tagged tagged { $<tag>1; $3; } ;
end: { } ;
tagged: { } ;
]])

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:6.8-45: warning: unset value: $$ [-Wother]
 start: end end tagged tagged { $<tag>1; $3; } ;
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:6.12-14: warning: unused value: $2 [-Wother]
 start: end end tagged tagged { $<tag>1; $3; } ;
            ^^^
input.y:7.6-8: warning: unset value: $$ [-Wother]
 end: { } ;
      ^^^
]])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <*>
%type <tag> tagged

%%

start: end end tagged tagged { $<tag>1; $3; } ;
end: { } ;
tagged: { } ;
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:6.23-28: warning: unused value: $4 [-Wother]
input.y:8.9-11: warning: unset value: $$ [-Wother]
]])

AT_CLEANUP


## ----------------------------------------- ##
## Unused values with per-type %destructor.  ##
## ----------------------------------------- ##

AT_SETUP([Unused values with per-type %destructor])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <field1>
%type <field1> start end

%%

start: end end { $1; } ;
end: { }  ;
]])

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:6.8-22: warning: unset value: $$ [-Wother]
 start: end end { $1; } ;
        ^^^^^^^^^^^^^^^
input.y:6.12-14: warning: unused value: $2 [-Wother]
 start: end end { $1; } ;
            ^^^
input.y:7.6-8: warning: unset value: $$ [-Wother]
 end: { }  ;
      ^^^
]])

AT_CLEANUP


## ---------------------- ##
## Incompatible Aliases.  ##
## ---------------------- ##

AT_SETUP([Incompatible Aliases])

AT_DATA([input.y],
[[%token foo "foo"

%type <bar>       foo
%printer {bar}    foo
%destructor {bar} foo
%left             foo

%type <baz>       "foo"
%printer {baz}    "foo"
%destructor {baz} "foo"
%left             "foo"

%%
exp: foo;
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:8.7-11: error: %type redeclaration for foo
 %type <baz>       "foo"
       ^^^^^
input.y:3.7-11:     previous declaration
 %type <bar>       foo
       ^^^^^
input.y:10.13-17: error: %destructor redeclaration for foo
 %destructor {baz} "foo"
             ^^^^^
input.y:5.13-17:      previous declaration
 %destructor {bar} foo
             ^^^^^
input.y:9.10-14: error: %printer redeclaration for foo
 %printer {baz}    "foo"
          ^^^^^
input.y:4.10-14:     previous declaration
 %printer {bar}    foo
          ^^^^^
input.y:11.1-5: error: %left redeclaration for foo
 %left             "foo"
 ^^^^^
input.y:6.1-5:      previous declaration
 %left             foo
 ^^^^^
]])

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_BISON_OPTION_PUSHDEFS
AT_DATA([input.y], [])
AT_BISON_CHECK([input.y], [1], [],
[[input.y:1.1: error: syntax error, unexpected end of file
]])


AT_DATA([input.y],
[{}
])
AT_BISON_CHECK([-fcaret  input.y], [1], [],
[[input.y:1.1-2: error: syntax error, unexpected {...}
 {}
 ^^
]])


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

#if 0
/* These examples test Bison while not stressing C compilers too much.
   Many C compilers mishandle backslash-newlines, so this part of the
   test is inside "#if 0".  The comment and string are written so that
   the "#endif" will be seen regardless of the C compiler bugs that we
   know about, namely:

     HP C (as of late 2002) mishandles *\[newline]\[newline]/ within a
     comment.

     The Apple Darwin compiler (as of late 2002) mishandles
     \\[newline]' within a character constant.

   */

/\
* A comment with backslash-newlines in it. %} *\
\
/
/* { Close the above comment, if the C compiler mishandled it.  */

char str[] = "\\
" A string with backslash-newlines in it %{ %} \\
\
"";

char apostrophe = '\'';
#endif

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

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

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

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


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

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

%{
]AT_YYERROR_DECLARE[
]AT_YYLEX_DECLARE[
%}

%type <ival> '@<:@'

/* Exercise quotes in strings.  */
%token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x1\1"

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

two: '\x000000000000000000000000000000000000000000000000000000000000000000002';
oline: '@' 'o' 'l' 'i' 'n' 'e' '@' '_' '_' 'o' 'l' 'i' 'n' 'e' '_' '_';
output.or.oline.opt: ;|oline;;|output;;;
output: '#' 'o' 'u' 't' 'p' 'u' 't' ' ';
%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 2.  */

static YYSTYPE
value_as_yystype (value val)
{
  YYSTYPE res;
  res.ival = val;
  return res;
}
]AT_YYERROR_DEFINE[
static int
yylex (void)
{
  static char const input[] = "@<:@\1\2$@{@oline@__@&t@oline__\
#output "; /* "
  */
  static size_t toknum;
  assert (toknum < sizeof input);
  yylval = value_as_yystype (input[toknum]);
  return input[toknum++];
}
]])

# Pacify Emacs'font-lock-mode: "

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

int yyparse (void);
]AT_MAIN_DEFINE[
]])
AT_BISON_OPTION_POPDEFS

AT_BISON_CHECK([-d -v -o input.c input.y])
AT_COMPILE([input.o])
AT_COMPILE([main.o])
AT_COMPILE([input], [input.o main.o])
AT_PARSER_CHECK([./input], 0,
[[[@<:@],
]])

AT_CLEANUP


## ---------------------- ##
## Typed symbol aliases.  ##
## ---------------------- ##

AT_SETUP([Typed symbol aliases])

# Bison 2.0 broke typed symbol aliases - ensure they work.

AT_DATA_GRAMMAR([input.y],
[[%union
{
  int val;
};
%token <val> MY_TOKEN "MY TOKEN"
%type <val> exp
%%
exp: "MY TOKEN";
%%
]])

AT_BISON_CHECK([-o input.c input.y])

AT_CLEANUP


## --------- ##
## Require.  ##
## --------- ##

m4_define([AT_CHECK_REQUIRE],
[AT_SETUP([Require $1])
AT_DATA_GRAMMAR([input.y],
[[%require "$1";
%%
empty_file: /* empty */;
]])
AT_BISON_CHECK([-o input.c input.y], $2, [], ignore)
AT_CLEANUP
])

AT_CHECK_REQUIRE(1.0, 0)
AT_CHECK_REQUIRE(AT_PACKAGE_VERSION, 0)
## FIXME: Some day augment this version number.
AT_CHECK_REQUIRE(100.0, 63)


## ------------------------------------- ##
## String aliases for character tokens.  ##
## ------------------------------------- ##

AT_SETUP([String aliases for character tokens])

# Bison once thought a character token and its alias were different
# symbols with the same user token number.

AT_DATA_GRAMMAR([input.y],
[[%token 'a' "a"
%%
start: 'a';
%%
]])

AT_BISON_CHECK([-o input.c input.y])

AT_CLEANUP


## -------------- ##
## Symbol names.  ##
## -------------- ##

AT_SETUP([Symbols])

AT_BISON_OPTION_PUSHDEFS
AT_DATA_GRAMMAR([input.y],
[[%token WITH-DASH
%token WITHOUT_DASH "WITHOUT-DASH"
%token WITH.PERIOD
%token WITHOUT_PERIOD "WITHOUT.PERIOD"
%code {
  ]AT_YYERROR_DECLARE[
  ]AT_YYLEX_DECLARE[
}
%%
start: with-dash without_dash with.period without_period;
with-dash: WITH-DASH;
without_dash: "WITHOUT-DASH";
with.period: WITH.PERIOD;
without_period: "WITHOUT.PERIOD";
%%
]AT_YYERROR_DEFINE[
]AT_YYLEX_DEFINE[
]])
AT_BISON_OPTION_POPDEFS

# POSIX Yacc accept periods, but not dashes.
AT_BISON_CHECK([--yacc -Wno-error input.y], [], [],
[[input.y:9.8-16: warning: POSIX Yacc forbids dashes in symbol names: WITH-DASH [-Wyacc]
input.y:20.8-16: warning: POSIX Yacc forbids dashes in symbol names: with-dash [-Wyacc]
]])

# So warn about them.
AT_BISON_CHECK([-Wyacc input.y], [], [],
[[input.y:9.8-16: warning: POSIX Yacc forbids dashes in symbol names: WITH-DASH [-Wyacc]
input.y:20.8-16: warning: POSIX Yacc forbids dashes in symbol names: with-dash [-Wyacc]
]])

# Dashes are fine for GNU Bison.
AT_BISON_CHECK([-o input.c input.y])

# Make sure we don't export silly token identifiers with periods or dashes.
AT_COMPILE([input.o])


# Periods are genuine letters, they can start identifiers.
# Digits and dashes cannot.
AT_DATA_GRAMMAR([input.y],
[[%token .GOOD
         -GOOD
         1NV4L1D
         -123
%%
start: .GOOD GOOD
]])
AT_BISON_CHECK([-o input.c input.y], [1], [],
[[input.y:10.10: error: invalid character: '-'
input.y:11.10-16: error: invalid identifier: '1NV4L1D'
input.y:12.10: error: invalid character: '-'
]])

AT_CLEANUP


## ----------------- ##
## Numbered tokens.  ##
## ----------------- ##

AT_SETUP([Numbered tokens])

AT_DATA_GRAMMAR([redecl.y],
[[%token DECIMAL_1     11259375
         HEXADECIMAL_1 0xabcdef
         HEXADECIMAL_2 0xFEDCBA
         DECIMAL_2     16702650
%%
start: DECIMAL_1 HEXADECIMAL_2;
]])

AT_BISON_CHECK([redecl.y], [1], [],
[[redecl.y:10.10-22: error: user token number 11259375 redeclaration for HEXADECIMAL_1
redecl.y:9.8-16:       previous declaration for DECIMAL_1
redecl.y:12.10-18: error: user token number 16702650 redeclaration for DECIMAL_2
redecl.y:11.10-22:     previous declaration for HEXADECIMAL_2
]])

AT_DATA_GRAMMAR([too-large.y],
[[%token TOO_LARGE_DEC 999999999999999999999
         TOO_LARGE_HEX 0xFFFFFFFFFFFFFFFFFFF
%%
start: TOO_LARGE_DEC TOO_LARGE_HEX
%%
]])

AT_BISON_CHECK([too-large.y], [1], [],
[[too-large.y:9.22-42: error: integer out of range: '999999999999999999999'
too-large.y:10.24-44: error: integer out of range: '0xFFFFFFFFFFFFFFFFFFF'
]])

AT_CLEANUP


## --------------------- ##
## Unclosed constructs.  ##
## --------------------- ##

AT_SETUP([Unclosed constructs])

# Bison's scan-gram.l once forgot to STRING_FINISH some unclosed
# constructs, so they were prepended to whatever it STRING_GROW'ed
# next.  It also threw them away rather than returning them to the
# parser.  The effect was confusing subsequent error messages.

AT_DATA([input.y],
[[%token A "a
%token B "b"
%token AB "ab" // Used to complain that "ab" was already used.
%token C '1
%token TWO "2"
%token TICK_TWELVE "'12" // Used to complain that "'12" was already used.

%%

start: ;

// Used to report a syntax error because it didn't see any kind of symbol
// identifier.
%type <f> 'a
;
%type <f> "a
;
// Used to report a syntax error because it didn't see braced code.
%destructor { free ($$)
]])

AT_BISON_CHECK([-fcaret -o input.c input.y], 1, [],
[[input.y:1.10-2.0: error: missing '"' at end of line
 %token A "a
          ^^
input.y:4.10-5.0: error: missing "'" at end of line
 %token C '1
          ^^
input.y:14.11-15.0: error: missing "'" at end of line
 %type <f> 'a
           ^^
input.y:16.11-17.0: error: missing '"' at end of line
 %type <f> "a
           ^^
input.y:19.13-20.0: error: missing '}' at end of file
 %destructor { free ($$)
             ^^^^^^^^^^^
input.y:20.1: error: syntax error, unexpected end of file
]])

AT_CLEANUP


## ------------------------- ##
## %start after first rule.  ##
## ------------------------- ##

AT_SETUP([%start after first rule])

# Bison once complained that a %start after the first rule was a
# redeclaration of the start symbol.

AT_DATA([input.y],
[[%%
false_start: ;
start: false_start ;
%start start;
]])

AT_BISON_CHECK([-o input.c input.y])

AT_CLEANUP


## --------------------- ##
## %prec takes a token.  ##
## --------------------- ##

AT_SETUP([%prec takes a token])

# Bison once allowed %prec sym where sym was a nonterminal.

AT_DATA([input.y],
[[%%
start: PREC %prec PREC ;
PREC: ;
]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:3.1-4: error: rule given for PREC, which is a token
]])

AT_CLEANUP


## ------------------------------- ##
## %prec's token must be defined.  ##
## ------------------------------- ##

AT_SETUP([[%prec's token must be defined]])

# According to POSIX, a %prec token must be defined separately.

AT_DATA([[input.y]],
[[%%
start: %prec PREC ;
]])

AT_BISON_CHECK([[input.y]], [[0]], [],
[[input.y:2.8-17: warning: token for %prec is not defined: PREC [-Wother]
]])

AT_CLEANUP


## -------------------------------- ##
## Reject unused %code qualifiers.  ##
## -------------------------------- ##

AT_SETUP([Reject unused %code qualifiers])

AT_DATA([input-c.y],
[[%code q {}
%code bad {}
%code bad {}
%code format {}
%%
start: ;
]])
AT_BISON_CHECK([[input-c.y]], [[1]], [],
[[input-c.y:1.7: error: %code qualifier 'q' is not used
input-c.y:2.7-9: error: %code qualifier 'bad' is not used
input-c.y:3.7-9: error: %code qualifier 'bad' is not used
input-c.y:4.7-12: error: %code qualifier 'format' is not used
]])

AT_DATA([input-c-glr.y],
[[%code q {}
%code bad {}
 %code bad {}
%%
start: ;
]])
AT_BISON_CHECK([[input-c-glr.y]], [[1]], [],
[[input-c-glr.y:1.7: error: %code qualifier 'q' is not used
input-c-glr.y:2.7-9: error: %code qualifier 'bad' is not used
input-c-glr.y:3.8-10: error: %code qualifier 'bad' is not used
]])

AT_DATA([input-c++.y],
[[%code q {}
%code bad {}
 %code q {}
%%
start: ;
]])
AT_BISON_CHECK([[input-c++.y]], [[1]], [],
[[input-c++.y:1.7: error: %code qualifier 'q' is not used
input-c++.y:2.7-9: error: %code qualifier 'bad' is not used
input-c++.y:3.8: error: %code qualifier 'q' is not used
]])

AT_DATA([input-c++-glr.y],
[[%code bad {}
%code q {}
%code q {}
%%
start: ;
]])
AT_BISON_CHECK([[input-c++-glr.y]], [[1]], [],
[[input-c++-glr.y:1.7-9: error: %code qualifier 'bad' is not used
input-c++-glr.y:2.7: error: %code qualifier 'q' is not used
input-c++-glr.y:3.7: error: %code qualifier 'q' is not used
]])

AT_DATA([special-char-@@.y],
[[%code bad {}
%code q {}
%code q {}
%%
start: ;
]])
AT_BISON_CHECK([[special-char-@@.y]], [[1]], [],
[[special-char-@@.y:1.7-9: error: %code qualifier 'bad' is not used
special-char-@@.y:2.7: error: %code qualifier 'q' is not used
special-char-@@.y:3.7: error: %code qualifier 'q' is not used
]])

AT_DATA([special-char-@:>@.y],
[[%code bad {}
%code q {}
%code q {}
%%
start: ;
]])
AT_BISON_CHECK([[special-char-@:>@.y]], [[1]], [],
[[special-char-@:>@.y:1.7-9: error: %code qualifier 'bad' is not used
special-char-@:>@.y:2.7: error: %code qualifier 'q' is not used
special-char-@:>@.y:3.7: error: %code qualifier 'q' is not used
]])

AT_CLEANUP


## ---------------- ##
## %define errors.  ##
## ---------------- ##

AT_SETUP([%define errors])

AT_DATA([input-redefined.y],
[[%define var "value1"
%define var "value1"
 %define var "value2"
%define special1 "@:>@"
%define special2 "@<:@"
%%
start: ;
]])

AT_BISON_CHECK([[input-redefined.y]], [[1]], [],
[[input-redefined.y:2.9-11: error: %define variable 'var' redefined
input-redefined.y:1.9-11:     previous definition
input-redefined.y:3.10-12: error: %define variable 'var' redefined
input-redefined.y:2.9-11:      previous definition
]])

AT_DATA([input-unused.y],
[[%define var "value"
%%
start: ;
]])

AT_BISON_CHECK([[input-unused.y]], [[1]], [],
[[input-unused.y:1.9-11: error: %define variable 'var' is not used
]])

AT_CLEANUP


## ----------------------------------- ##
## %define, --define, --force-define.  ##
## ----------------------------------- ##

AT_SETUP([[%define, --define, --force-define]])

AT_DATA([[skel.c]],
[[m4@&t@_divert_push(0)@
@output(b4_parser_file_name@)@
[var-dd: ]b4_percent_define_get([[var-dd]])[
var-ff: ]b4_percent_define_get([[var-ff]])[
var-dfg: ]b4_percent_define_get([[var-dfg]])[
var-fd: ]b4_percent_define_get([[var-fd]])
m4@&t@_divert_pop(0)
]])
AT_DATA([[input.y]],
[[%define var-dfg "gram"
%%
start: ;
]])
AT_BISON_CHECK([[-Dvar-dd=cmd-d1 -Dvar-dd=cmd-d2 \
                 -Fvar-ff=cmd-f1 -Fvar-ff=cmd-f2 \
                 -Dvar-dfg=cmd-d -Fvar-dfg=cmd-f \
                 -Fvar-fd=cmd-f -Dvar-fd=cmd-d   \
                 --skeleton ./skel.c input.y]])
AT_CHECK([[cat input.tab.c]], [[0]],
[[var-dd: cmd-d2
var-ff: cmd-f2
var-dfg: cmd-f
var-fd: cmd-d
]])

AT_DATA([[input-dg.y]],
[[%define var "gram"
%%
start: ;
]])
AT_BISON_CHECK([[-Dvar=cmd-d input-dg.y]], [[1]], [],
[[input-dg.y:1.9-11: error: %define variable 'var' redefined
<command line>:2:      previous definition
]])

AT_DATA([[input-dg.y]],
[[%define var "gram"
%%
start: ;
]])
AT_BISON_CHECK([[-fcaret -Dvar=cmd-d input-dg.y]], [[1]], [],
[[input-dg.y:1.9-11: error: %define variable 'var' redefined
 %define var "gram"
         ^^^
<command line>:3:      previous definition
]])

AT_DATA([[input-unused.y]],
[[%%
start: ;
]])
AT_BISON_CHECK([[-Dunused-d -Funused-f input-unused.y]], [[1]], [],
[[<command line>:2: error: %define variable 'unused-d' is not used
<command line>:3: error: %define variable 'unused-f' is not used
]])

AT_CLEANUP

## --------------------------- ##
## %define Boolean variables.  ##
## --------------------------- ##

AT_SETUP([["%define" Boolean variables]])

AT_DATA([Input.y],
[[%language "Java"
%define public "maybe"
%define parser_class_name "Input"
%%
start: ;
]])

AT_BISON_CHECK([[Input.y]], [1], [],
[[Input.y:2.9-14: error: invalid value for %define Boolean variable 'public'
]])

AT_CLEANUP

## ------------------------ ##
## %define enum variables.  ##
## ------------------------ ##

AT_SETUP([["%define" enum variables]])

# Check errors from the front-end, and the back-end.  Since the
# front-end quits before calling the back-end, these tests cannot be
# fused.

# Front-end.
AT_DATA([[input.y]],
[[%define lr.default-reduction bogus
%%
start: ;
]])
AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:1.9-28: error: invalid value for %define variable 'lr.default-reduction': 'bogus'
 %define lr.default-reduction bogus
         ^^^^^^^^^^^^^^^^^^^^
input.y:1.9-28:     accepted value: 'most'
input.y:1.9-28:     accepted value: 'consistent'
input.y:1.9-28:     accepted value: 'accepting'
]])

# Back-end.
AT_DATA([[input.y]],
[[%define api.push-pull neither
%%
start: ;
]])
AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:1.9-21: error: invalid value for %define variable 'api.push-pull': 'neither'
 %define api.push-pull neither
         ^^^^^^^^^^^^^
input.y:1.9-21:     accepted value: 'pull'
input.y:1.9-21:     accepted value: 'push'
input.y:1.9-21:     accepted value: 'both'
]])

AT_CLEANUP

## -------------------------------- ##
## %define backward compatibility.  ##
## -------------------------------- ##

AT_SETUP([["%define" backward compatibility]])

# The error messages tell us whether the variables are properly updated.
AT_DATA([[input.y]],
[[%define api.push_pull both
%define lr.keep_unreachable_states maybe
%define namespace "foo"
%define api.namespace "foo"
%define variant
%%
start: ;
]])
AT_BISON_CHECK([[-fcaret input.y]], [1], [],
[[input.y:1.9-21: warning: deprecated directive, use '%define api.push-pull both' [-Wdeprecated]
 %define api.push_pull both
         ^^^^^^^^^^^^^
input.y:2.9-34: warning: deprecated directive, use '%define lr.keep-unreachable-state maybe' [-Wdeprecated]
 %define lr.keep_unreachable_states maybe
         ^^^^^^^^^^^^^^^^^^^^^^^^^^
input.y:3.9-17: warning: deprecated directive, use '%define api.namespace foo' [-Wdeprecated]
 %define namespace "foo"
         ^^^^^^^^^
input.y:4.9-21: error: %define variable 'api.namespace' redefined
 %define api.namespace "foo"
         ^^^^^^^^^^^^^
input.y:3.9-17:     previous definition
 %define namespace "foo"
         ^^^^^^^^^
input.y:5.9-15: warning: deprecated directive, use '%define api.value.type variant' [-Wdeprecated]
 %define variant
         ^^^^^^^
]])

AT_CLEANUP

## ------------------------- ##
## Unused %define api.pure.  ##
## ------------------------- ##

AT_SETUP([[Unused %define api.pure]])

# AT_CHECK_API_PURE(DECLS, VALUE)
# -------------------------------
# Make sure Bison reports that `%define api.pure VALUE' is unused when DECLS
# are specified.
m4_define([AT_CHECK_API_PURE],
[
AT_DATA([[input.y]],
[[%define api.pure ]$2[
]$1[
%%
start: ;
]])

AT_BISON_CHECK([[input.y]], [[1]], [],
[[input.y:1.9-16: error: %define variable 'api.pure' is not used
]])
])

AT_CHECK_API_PURE([[%language "c++"]], [[]])
AT_CHECK_API_PURE([[%language "c++"]], [[false]])
AT_CHECK_API_PURE([[%language "c++" %glr-parser]], [[""]])
AT_CHECK_API_PURE([[%language "c++" %glr-parser]], [[false]])
AT_CHECK_API_PURE([[%language "java"]], [[true]])
AT_CHECK_API_PURE([[%language "java"]], [[false]])

AT_CLEANUP

## -------------------------------- ##
## C++ namespace reference errors.  ##
## -------------------------------- ##

AT_SETUP([[C++ namespace reference errors]])

# AT_CHECK_NAMESPACE_ERROR(NAMESPACE-DECL, ERROR, [ERROR], ...)
# -------------------------------------------------------------
# Make sure Bison reports all ERROR's for %define namespace "NAMESPACE-DECL".
m4_define([AT_CHECK_NAMESPACE_ERROR],
[
AT_DATA([[input.y]],
[[%language "C++"
%defines
%define api.namespace "]$1["
%%
start: ;
]])

AT_BISON_CHECK([[input.y]], [1], [],
[m4_foreach([b4_arg], m4_dquote(m4_shift($@)),
[[input.y:3.9-21: error: ]b4_arg[
]])])
])

AT_CHECK_NAMESPACE_ERROR([[]],
                         [[namespace reference is empty]])
AT_CHECK_NAMESPACE_ERROR([[ @tb@@tb@  @tb@ @tb@]],
                         [[namespace reference is empty]])
AT_CHECK_NAMESPACE_ERROR([[foo::::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo:: @tb@::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[::::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[:: ::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar::@tb@::]],
                         [[namespace reference has consecutive "::"]],
                         [[namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar::]],
                         [[namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar:: @tb@]],
                         [[namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[::]],
                         [[namespace reference has a trailing "::"]])

AT_CLEANUP

## ------------------------ ##
## Bad character literals.  ##
## ------------------------ ##

# Bison used to accept character literals that were empty or contained
# too many characters.

# FIXME: AT_DATA or some variant of AT_DATA may eventually permit
# the final newline to be omitted.  See the threads starting at
# <http://lists.gnu.org/archive/html/bison-patches/2009-07/msg00019.html>.

AT_SETUP([[Bad character literals]])

AT_DATA([empty.y],
[[%%
start: '';
start: '
]])
AT_CHECK([[$PERL -e "print 'start: \'';" >> empty.y || exit 77]])

AT_BISON_CHECK([-fcaret empty.y], [1], [],
[[empty.y:2.8-9: warning: empty character literal [-Wother]
 start: '';
        ^^
empty.y:3.8-4.0: error: missing "'" at end of line
 start: '
        ^
empty.y:3.8-4.0: warning: empty character literal [-Wother]
 start: '
        ^
empty.y:4.8: error: missing "'" at end of file
 start: '
        ^
empty.y:4.8: warning: empty character literal [-Wother]
 start: '
        ^
]])

AT_DATA([two.y],
[[%%
start: 'ab';
start: 'ab
]])
AT_CHECK([[$PERL -e "print 'start: \'ab';" >> two.y || exit 77]])

AT_BISON_CHECK([two.y], [1], [],
[[two.y:2.8-11: warning: extra characters in character literal [-Wother]
two.y:3.8-4.0: error: missing "'" at end of line
two.y:3.8-4.0: warning: extra characters in character literal [-Wother]
two.y:4.8-10: error: missing "'" at end of file
two.y:4.8-10: warning: extra characters in character literal [-Wother]
]])

AT_DATA([three.y],
[[%%
start: 'abc';
start: 'abc
]])
AT_CHECK([[$PERL -e "print 'start: \'abc';" >> three.y || exit 77]])

AT_BISON_CHECK([three.y], [1], [],
[[three.y:2.8-12: warning: extra characters in character literal [-Wother]
three.y:3.8-4.0: error: missing "'" at end of line
three.y:3.8-4.0: warning: extra characters in character literal [-Wother]
three.y:4.8-11: error: missing "'" at end of file
three.y:4.8-11: warning: extra characters in character literal [-Wother]
]])

AT_CLEANUP

## ------------------------- ##
## Bad escapes in literals.  ##
## ------------------------- ##

AT_SETUP([[Bad escapes in literals]])

AT_DATA([input.y],
[[%%
start: '\777' '\0' '\xfff' '\x0'
       '\uffff' '\u0000' '\Uffffffff' '\U00000000'
       '\ ' '\A';
]])

# It is not easy to create special characters, we cannot even trust tr.
# Beside we cannot even expect "echo '\0'" to output two characters
# (well three with \n): at least Bash 3.2 converts the two-character
# sequence "\0" into a single NUL character.
AT_CHECK([[$PERL -e 'print "start: \"\\\t\\\f\\\0\\\1\" ;";' >> input.y \
           || exit 77]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:2.9-12: error: invalid number after \-escape: 777
input.y:2.8-13: warning: empty character literal [-Wother]
input.y:2.16-17: error: invalid number after \-escape: 0
input.y:2.15-18: warning: empty character literal [-Wother]
input.y:2.21-25: error: invalid number after \-escape: xfff
input.y:2.20-26: warning: empty character literal [-Wother]
input.y:2.29-31: error: invalid number after \-escape: x0
input.y:2.28-32: warning: empty character literal [-Wother]
input.y:3.9-14: error: invalid number after \-escape: uffff
input.y:3.8-15: warning: empty character literal [-Wother]
input.y:3.18-23: error: invalid number after \-escape: u0000
input.y:3.17-24: warning: empty character literal [-Wother]
input.y:3.27-36: error: invalid number after \-escape: Uffffffff
input.y:3.26-37: warning: empty character literal [-Wother]
input.y:3.40-49: error: invalid number after \-escape: U00000000
input.y:3.39-50: warning: empty character literal [-Wother]
input.y:4.9-10: error: invalid character after \-escape: ' '
input.y:4.8-11: warning: empty character literal [-Wother]
input.y:4.14-15: error: invalid character after \-escape: A
input.y:4.13-16: warning: empty character literal [-Wother]
input.y:5.9-16: error: invalid character after \-escape: \t
input.y:5.17: error: invalid character after \-escape: \f
input.y:5.18: error: invalid character after \-escape: \0
input.y:5.19: error: invalid character after \-escape: \001
]])

AT_CLEANUP

## ------------------------- ##
## LAC: Errors for %define.  ##
## ------------------------- ##

AT_SETUP([[LAC: Errors for %define]])

AT_DATA([[input.y]],
[[%%
start: ;
]])

# parse.lac.* options are useless if LAC isn't actually activated.
AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 input.y]],
               [[1]], [],
[[<command line>:2: error: %define variable 'parse.lac.es-capacity-initial' is not used
]])
AT_BISON_CHECK([[-Dparse.lac.memory-trace=full input.y]],
               [[1]], [],
[[<command line>:2: error: %define variable 'parse.lac.memory-trace' is not used
]])

AT_CLEANUP

## --------------------------------------------- ##
## -Werror is not affected by -Wnone and -Wall.  ##
## --------------------------------------------- ##

AT_SETUP([[-Werror is not affected by -Wnone and -Wall]])

AT_DATA([[input.y]],
[[%%
foo-bar: ;
]])

# -Werror is not enabled by -Wall or equivalent.
AT_BISON_CHECK([[-Wall input.y]], [[0]], [[]],
[[input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar [-Wyacc]
]])
AT_BISON_CHECK([[-W input.y]], [[0]], [[]],
[[input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar [-Wyacc]
]])
AT_BISON_CHECK([[-Wno-none input.y]], [[0]], [[]],
[[input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar [-Wyacc]
]])

# -Werror is not disabled by -Wnone or equivalent.
AT_BISON_CHECK([[-Werror,none,yacc input.y]], [[1]], [[]], [[stderr]])
AT_CHECK([[sed 's/^.*bison:/bison:/' stderr]], [[0]],
[[input.y:2.1-7: error: POSIX Yacc forbids dashes in symbol names: foo-bar [-Werror=yacc]
]])
[mv stderr experr]
AT_BISON_CHECK([[-Werror,no-all,yacc input.y]], [[1]], [[]], [[experr]])

AT_CLEANUP


## ------------------------------------------------------ ##
## %name-prefix and %define api.prefix are incompatible.  ##
## ------------------------------------------------------ ##

AT_SETUP([[%name-prefix and api.prefix are incompatible]])

# AT_TEST(DIRECTIVES, OPTIONS, ERROR-LOCATION)
# --------------------------------------------
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[[$1
%%
exp: /* empty */;
]])
AT_BISON_CHECK([[$2 input.y]], [[1]], [[]],
[[$3: error: '%name-prefix' and '%define api.prefix' cannot be used together
]])
])

AT_TEST([%define api.prefix foo %name-prefix "bar"], [], [input.y:1.9-18])
AT_TEST([], [-Dapi.prefix=foo -p bar], [<command line>:2])
AT_TEST([%name-prefix "bar"], [-Dapi.prefix=foo], [<command line>:2])
AT_TEST([%define api.prefix foo], [-p bar], [input.y:1.9-18])

m4_popdef([AT_TEST])

AT_CLEANUP


## -------------- ##
## Stray $ or @.  ##
## -------------- ##

AT_SETUP([[Stray $ or @]])

# Give %printer and %destructor "<*> exp TOK" instead of "<*>" to
# check that the warnings are reported once, not three times.

AT_DATA_GRAMMAR([[input.y]],
[[%type <TYPE> exp
%token <TYPE> TOK TOK2
%destructor     { $%; @%; } <*> exp TOK;
%initial-action { $%; @%; };
%printer        { $%; @%; } <*> exp TOK;
%{ $ @ %} // Should not warn.
%%
exp: TOK        { $%; @%; $$ = $1; };
%%
$ @ // Should not warn.
]])

AT_BISON_CHECK([[-Wall input.y]], 0, [],
[[input.y:11.19: warning: stray '$' [-Wother]
input.y:11.23: warning: stray '@' [-Wother]
input.y:12.19: warning: stray '$' [-Wother]
input.y:12.23: warning: stray '@' [-Wother]
input.y:13.19: warning: stray '$' [-Wother]
input.y:13.23: warning: stray '@' [-Wother]
input.y:16.19: warning: stray '$' [-Wother]
input.y:16.23: warning: stray '@' [-Wother]
]])

AT_CLEANUP


## ---------------- ##
## Code injection.  ##
## ---------------- ##


AT_SETUP([[Code injection]])

m4_pattern_allow([^m4_errprintn$])

# AT_TEST([MACRO])
# ----------------
# Try to have MACRO be run by bison.
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[[%type <$1(DEAD %type)> exp
%token <$1(DEAD %token)> a
%token b
%initial-action
{
  $$;
  $<$1(DEAD %initial-action)>$
};
%printer
{
  $$
  $<$1(DEAD %printer)>$
} <> <*>;
%lex-param
{
  $1(DEAD %lex-param)
};
%parse-param
{
  $1(DEAD %parse-param)
};
%%
exp:
  a a[name] b
  {
    $$;
    $][1;
    $<$1(DEAD action 1)>$
    $<$1(DEAD action 2)>1
    $<$1(DEAD action 3)>name
    $<$1(DEAD action 4)>0
    ;
  };
]])

# FIXME: Provide a means to iterate over all the skeletons.
AT_BISON_CHECK([[-d               input.y]])
AT_BISON_CHECK([[-d -S glr.c      input.y]])
AT_BISON_CHECK([[-d -S lalr1.cc   input.y]])
AT_BISON_CHECK([[-d -S glr.cc     input.y]])
AT_BISON_CHECK([[   -S lalr1.java input.y]])
])

AT_TEST([m4_errprintn])
AT_TEST([@:>@m4_errprintn])

m4_popdef([AT_TEST])

AT_CLEANUP

##----------------------- ##
## Deprecated directives. ##
## ---------------------- ##

AT_SETUP([[Deprecated directives]])

AT_KEYWORDS([[deprec]])

AT_DATA_GRAMMAR([[input.y]],
[[
%default_prec
%error_verbose
%expect_rr 0
%file-prefix = "foo"
%file-prefix
 =
"bar"
%fixed-output_files
%fixed_output-files
%fixed-output-files
%name-prefix= "foo"
%no-default_prec
%no_default-prec
%no_lines
%output = "foo"
%pure_parser
%token_table
%glr-parser
%% exp : '0'
]])

AT_BISON_CHECK([[input.y]], [[0]], [[]],
[[input.y:10.1-13: warning: deprecated directive: '%default_prec', use '%default-prec' [-Wdeprecated]
input.y:11.1-14: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
input.y:12.1-10: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
input.y:13.1-14: warning: deprecated directive: '%file-prefix =', use '%file-prefix' [-Wdeprecated]
input.y:14.1-15.2: warning: deprecated directive: '%file-prefix\n =', use '%file-prefix' [-Wdeprecated]
input.y:17.1-19: warning: deprecated directive: '%fixed-output_files', use '%fixed-output-files' [-Wdeprecated]
input.y:18.1-19: warning: deprecated directive: '%fixed_output-files', use '%fixed-output-files' [-Wdeprecated]
input.y:20.1-13: warning: deprecated directive: '%name-prefix=', use '%name-prefix' [-Wdeprecated]
input.y:21.1-16: warning: deprecated directive: '%no-default_prec', use '%no-default-prec' [-Wdeprecated]
input.y:22.1-16: warning: deprecated directive: '%no_default-prec', use '%no-default-prec' [-Wdeprecated]
input.y:23.1-9: warning: deprecated directive: '%no_lines', use '%no-lines' [-Wdeprecated]
input.y:24.1-9: warning: deprecated directive: '%output =', use '%output' [-Wdeprecated]
input.y:25.1-12: warning: deprecated directive: '%pure_parser', use '%pure-parser' [-Wdeprecated]
input.y:26.1-12: warning: deprecated directive: '%token_table', use '%token-table' [-Wdeprecated]
]])

AT_CLEANUP

## ---------------------------- ##
## Unput's effect on locations. ##
## ---------------------------- ##
dnl When the scanner detects a deprecated construct, it unputs the correct
dnl version, but it should *not* have any impact on the scanner cursor. If it
dnl does, the locations of directives on the same line become erroneous.

AT_SETUP([[Unput's effect on locations]])

AT_KEYWORDS([[deprec]])

AT_DATA_GRAMMAR([[input.y]],
[[
%glr-parser
%expect_rr 42 %expect_rr 42
              %expect_rr 42
%error_verbose %error_verbose
               %error_verbose
%% exp: '0'
]])

AT_BISON_CHECK([[input.y]], [[1]], [[]],
[[input.y:11.1-10: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
input.y:11.15-24: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
input.y:12.15-24: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
input.y:13.1-14: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
input.y:13.16-29: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
input.y:13.11-21: error: %define variable 'parse.error' redefined
input.y:13-6:         previous definition
input.y:14.16-29: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
input.y:14.11-21: error: %define variable 'parse.error' redefined
input.y:13.11-21:     previous definition
]])

AT_CLEANUP

##--------------------------- ##
## Non-deprecated directives. ##
## -------------------------- ##

AT_SETUP([[Non-deprecated directives]])

AT_KEYWORDS([[deprec]])

AT_DATA_GRAMMAR([[input.y]],
[[
%default-prec
%error-verbose
%expect-rr 42
%file-prefix "foo"
%file-prefix
"bar"
%fixed-output-files
%name-prefix "foo"
%no-default-prec
%no-lines
%output "foo"
%pure-parser
%token-table
%% exp : '0'
]])

AT_BISON_CHECK([[input.y]], [[0]], [[]],
[[input.y: warning: %expect-rr applies only to GLR parsers [-Wother]
]])

AT_CLEANUP