tests/input.at

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

# Copyright (C) 2002-2015, 2018-2021 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 <https://www.gnu.org/licenses/>.

AT_BANNER([[Input Processing.]])

# Mostly test that we are robust to mistakes.


## ----------------------------- ##
## Invalid number of arguments.  ##
## ----------------------------- ##

AT_SETUP([Invalid number of arguments])

AT_BISON_CHECK([], [1], [],
[[bison: missing operand
Try 'bison --help' for more information.
]])

AT_BISON_CHECK([1.y 2.y], [1], [],
[[bison: extra operand '2.y'
Try 'bison --help' for more information.
]])

# For some reason, on some systems we use the system's getopt, not the
# one we ship in gnulib.  So we can get two different error messages.
# See https://lists.gnu.org/r/bison-patches/2018-10/msg00154.html
AT_BISON_CHECK([--skeleton], [1], [], [stderr])
AT_CHECK([[sed -e \
  "s/requires an argument -- skeleton/'--skeleton' requires an argument/" \
  stderr]], 0,
[[bison: option '--skeleton' requires an argument
Try 'bison --help' for more information.
]])

AT_CLEANUP



## ----------------- ##
## 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.  ##
## ---------------- ##

# The truly bad guys no human would write, but easily uncovered by
# fuzzers.
AT_SETUP([Invalid inputs])

AT_DATA([input.y],
[[%header "\360\000\200\210"
\000\001\002\377?
"\000"
%%
?
default: 'a' }
%&
%a-does-not-exist
%-
%{
]])
AT_PERL_REQUIRE([[-pi -e 's/\\(\d{3})/chr(oct($1))/ge' input.y]])

AT_BISON_CHECK([-fcaret input.y], [1], [], [stderr])

# Autotest's diffing, when there are NUL bytes, just reports "binary
# files differ".  So don't leave NUL bytes.  And don't leave invalid
# mbchars either: escape raw binary.
AT_PERL_CHECK([[-p -e 's{([\0\200\210\360\377])}{sprintf "\\x%02x", ord($1)}ge' stderr]], [],
[[input.y:1.11: error: invalid null character
    1 | %header "\xf0\x00\x80\x88"
      |           ^
input.y:2.1-2: error: invalid characters: '\0\001\002\377?'
    2 | \x00
\xff?
      | ^~
input.y:3.2: error: invalid null character
    3 | "\x00"
      |  ^
input.y:5.1: error: invalid character: '?'
    5 | ?
      | ^
input.y:6.14: error: invalid character: '}'
    6 | default: 'a' }
      |              ^
input.y:7.1: error: invalid character: '%'
    7 | %&
      | ^
input.y:7.2: error: invalid character: '&'
    7 | %&
      |  ^
input.y:8.1-17: error: invalid directive: '%a-does-not-exist'
    8 | %a-does-not-exist
      | ^~~~~~~~~~~~~~~~~
input.y:9.1: error: invalid character: '%'
    9 | %-
      | ^
input.y:9.2: error: invalid character: '-'
    9 | %-
      |  ^
input.y:10.1-11.0: error: missing '%}' at end of file
   10 | %{
      | ^~
]])

AT_CLEANUP


## ------------------------ ##
## Invalid inputs with {}.  ##
## ------------------------ ##

AT_SETUP([Invalid inputs with {}])

# We used to SEGV here.  See
# https://lists.gnu.org/r/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: expected {...} before %initial-action
]])

AT_CLEANUP


## -------------------------- ##
## Yacc warnings on symbols.  ##
## -------------------------- ##

AT_SETUP([Yacc warnings on symbols])

AT_DATA([input.y],
[[%nterm exp
%token NUM 0x40 "number"
%%
exp: "number";
]])

AT_BISON_CHECK([-fcaret -Wyacc input.y], [0], [],
[[input.y:1.1-6: warning: POSIX Yacc does not support %nterm [-Wyacc]
    1 | %nterm exp
      | ^~~~~~
input.y:2.12-15: warning: POSIX Yacc does not support hexadecimal literals [-Wyacc]
    2 | %token NUM 0x40 "number"
      |            ^~~~
input.y:2.17-24: warning: POSIX Yacc does not support string literals [-Wyacc]
    2 | %token NUM 0x40 "number"
      |                 ^~~~~~~~
input.y:4.6-13: warning: POSIX Yacc does not support string literals [-Wyacc]
    4 | exp: "number";
      |      ^~~~~~~~
]])

AT_CLEANUP


## --------------- ##
## Yacc warnings.  ##
## --------------- ##

AT_SETUP([Yacc warnings])

AT_DATA([input.y],
[[%destructor {} <int>
%printer {} <int>
%type <int> exp a b
%%
exp: a b             { $$ = $1 + $2; };
a: <int>{ $$ = 42; } { $$ = $1; };
b: %empty            { $$ = 42; };
]])

AT_BISON_CHECK([-fcaret -Wyacc input.y], [0], [],
[[input.y:1.1-11: warning: POSIX Yacc does not support %destructor [-Wyacc]
    1 | %destructor {} <int>
      | ^~~~~~~~~~~
input.y:2.1-8: warning: POSIX Yacc does not support %printer [-Wyacc]
    2 | %printer {} <int>
      | ^~~~~~~~
input.y:6.9-20: warning: POSIX Yacc does not support typed midrule actions [-Wyacc]
    6 | a: <int>{ $$ = 42; } { $$ = $1; };
      |         ^~~~~~~~~~~~
input.y:7.4-9: warning: POSIX Yacc does not support %empty [-Wyacc]
    7 | b: %empty            { $$ = 42; };
      |    ^~~~~~
]])

AT_CLEANUP


## -------------- ##
## Yacc's %type.  ##
## -------------- ##

AT_SETUP([Yacc's %type])

AT_DATA([input.y],
[[%token TOKEN1
%nterm nterm1
%type <ival> TOKEN1 TOKEN2 "TOKEN3" nterm1 nterm2 nterm3 '+'
%token TOKEN2
%nterm nterm2
%%
expr: nterm1 nterm2 nterm3
nterm1: TOKEN1
nterm2: TOKEN2
nterm3: "TOKEN3"
]])

AT_BISON_CHECK([-fcaret -Wyacc input.y], [0], [],
[[input.y:2.1-6: warning: POSIX Yacc does not support %nterm [-Wyacc]
    2 | %nterm nterm1
      | ^~~~~~
input.y:3.14-19: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
    3 | %type <ival> TOKEN1 TOKEN2 "TOKEN3" nterm1 nterm2 nterm3 '+'
      |              ^~~~~~
input.y:3.28-35: warning: POSIX Yacc does not support string literals [-Wyacc]
    3 | %type <ival> TOKEN1 TOKEN2 "TOKEN3" nterm1 nterm2 nterm3 '+'
      |                            ^~~~~~~~
input.y:3.28-35: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
    3 | %type <ival> TOKEN1 TOKEN2 "TOKEN3" nterm1 nterm2 nterm3 '+'
      |                            ^~~~~~~~
input.y:3.58-60: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
    3 | %type <ival> TOKEN1 TOKEN2 "TOKEN3" nterm1 nterm2 nterm3 '+'
      |                                                          ^~~
input.y:5.1-6: warning: POSIX Yacc does not support %nterm [-Wyacc]
    5 | %nterm nterm2
      | ^~~~~~
input.y:3.21-26: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
    3 | %type <ival> TOKEN1 TOKEN2 "TOKEN3" nterm1 nterm2 nterm3 '+'
      |                     ^~~~~~
input.y:10.9-16: warning: POSIX Yacc does not support string literals [-Wyacc]
   10 | nterm3: "TOKEN3"
      |         ^~~~~~~~
]])

AT_CLEANUP


## ----------------------------- ##
## Invalid symbol declarations.  ##
## ----------------------------- ##

AT_SETUP([Invalid symbol declarations])

AT_DATA([input.y],
[[%nterm expr "expression";
%nterm term 123;
%nterm fact 124 "factor";
%nterm '+' '*';
%nterm "number";
%token "tok1" 1;
%left "tok2" 2;
%type "tok3" 3;
%%
expr: expr '+' term | term;
term: term '*' fact | fact;
fact: "number";
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:1.13-24: error: nonterminals cannot be given a string alias
    1 | %nterm expr "expression";
      |             ^~~~~~~~~~~~
input.y:2.13-15: error: nonterminals cannot be given a token code
    2 | %nterm term 123;
      |             ^~~
input.y:3.13-15: error: nonterminals cannot be given a token code
    3 | %nterm fact 124 "factor";
      |             ^~~
input.y:3.17-24: error: nonterminals cannot be given a string alias
    3 | %nterm fact 124 "factor";
      |                 ^~~~~~~~
input.y:4.8-10: error: character literals cannot be nonterminals
    4 | %nterm '+' '*';
      |        ^~~
input.y:5.8-15: error: expected character literal or identifier or <tag> before string
    5 | %nterm "number";
      |        ^~~~~~~~
input.y:6.8-13: error: expected character literal or identifier or <tag> before string
    6 | %token "tok1" 1;
      |        ^~~~~~
input.y:7.14: error: unexpected integer literal
    7 | %left "tok2" 2;
      |              ^
input.y:8.14: error: unexpected integer literal
    8 | %type "tok3" 3;
      |              ^
]])

AT_CLEANUP


## ---------------------------- ##
## Redefining the error token.  ##
## ---------------------------- ##

AT_SETUP([Redefining the error token])

# We used to crash when trying to display the original definition of
# "error", which is a builtin without any location.
AT_BISON_OPTION_PUSHDEFS

AT_DATA([input.y],
[[%token error 123
%token error 124
%%
exp:
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.8-12: warning: symbol error redeclared [-Wother]
    2 | %token error 124
      |        ^~~~~
input.y:1.8-12: note: previous declaration
    1 | %token error 123
      |        ^~~~~
input.y:2.14-16: error: redefining code of token error
    2 | %token error 124
      |              ^~~
]])

# While at it, make sure we properly used the user's number for
# "error".  I don't see what it buys us, but...
AT_DATA([input.y],
[[%{
#include <assert.h>
#include <stdio.h>
]AT_YYERROR_DEFINE[
]AT_YYLEX_DEFINE[
%}

%token error 123
%%
exp:
%%
int main (void)
{
  assert (YYerror == 123);
  assert (YYTRANSLATE (YYEOF) == YYSYMBOL_YYEOF);
  assert (YYTRANSLATE (YYerror) == YYSYMBOL_YYerror);
  assert (YYTRANSLATE (YYUNDEF) == YYSYMBOL_YYUNDEF);
  return 0;
}
]])

AT_FULL_COMPILE([input])
AT_PARSER_CHECK([input], 0)

AT_BISON_OPTION_POPDEFS
AT_CLEANUP


## ------------------ ##
## Dangling aliases.  ##
## ------------------ ##

AT_SETUP([Dangling aliases])

AT_DATA([input.y],
[[%token FOO "foo"
%type <val> "bar"
%%
expr: "foo" "bar" "baz"
]])

AT_BISON_CHECK([-fcaret -Wdangling input.y], [0], [],
[[input.y:2.13-17: warning: string literal "bar" not attached to a symbol [-Wdangling-alias]
    2 | %type <val> "bar"
      |             ^~~~~
input.y:4.19-23: warning: string literal "baz" not attached to a symbol [-Wdangling-alias]
    4 | expr: "foo" "bar" "baz"
      |                   ^~~~~
]])

AT_CLEANUP


## --------------------- ##
## Symbol declarations.  ##
## --------------------- ##

# Check the parsing of %token, %nterm, %type and %left...
AT_SETUP([Symbol declarations])

AT_DATA([dump-symbols.m4],
[[m4@&t@_define([b4_api_PREFIX], [YY])

m4@&t@_define([b4_symbol_dump],
[$1, d@&t@nl
b4_symbol_if([$1], [is_token], [Token], [Nonterminal]), d@&t@nl
b4_symbol([$1], [tag]), d@&t@nl
b4_symbol([$1], [id]), d@&t@nl
b4_symbol([$1], [code]), d@&t@nl
b4_symbol([$1], [type]),
])

b4_output_begin([symbols.csv])
number, class, tag, id, code, type,
b4_symbol_foreach([b4_symbol_dump])d@&t@nl
b4_output_end
]])

AT_DATA([input.y],
[[%token 'a' A1 1 "A1" A2 A3 "A3" A4 4
      <type_b> 'b' B5 5 "B5" B6 B7 "B8" B9 9
      <type_c> 'c' C10 10 "C10" C11 C12 "C12" C13 13

%left 'd' D20 20 "D20" D21 D22 "D22" D23 23
      <type_e> 'e' E25 25 "E25" E26 E27 "E28" E29 29
      <type_f> 'f' F30 30 "F30" F31 F32 "F32" F33 33

%type 'g' G40 "D40" G21 G22 G23
      <type_h> 'h' H25 "H25" H26 H27 "H28" H29
      <type_i> 'i' I30 "I30" I31 I32 "I32" I33

%nterm j60 j61 j62 j63
      <type_k> k75 k76 k77 k79
      <type_l> l80 l81 l82 l83
%%
exp:;
]])

AT_BISON_CHECK([-Wno-other -S./dump-symbols.m4 input.y])
AT_CHECK([cat symbols.csv], [],
[[number, class, tag, id, code, type,
0, Token, "end of file", YYEOF, 0, ,
1, Token, error, YYerror, 256, ,
2, Token, "invalid token", YYUNDEF, 257, ,
3, Token, 'a', , 97, ,
4, Token, "A1", A1, 1, ,
5, Token, A2, A2, 258, ,
6, Token, "A3", A3, 259, ,
7, Token, A4, A4, 4, ,
8, Token, 'b', , 98, type_b,
9, Token, "B5", B5, 5, type_b,
10, Token, B6, B6, 260, type_b,
11, Token, "B8", B7, 261, type_b,
12, Token, B9, B9, 9, type_b,
13, Token, 'c', , 99, type_c,
14, Token, "C10", C10, 10, type_c,
15, Token, C11, C11, 262, type_c,
16, Token, "C12", C12, 263, type_c,
17, Token, C13, C13, 13, type_c,
18, Token, 'd', , 100, ,
19, Token, D20, D20, 20, ,
20, Token, "D20", , 264, ,
21, Token, D21, D21, 265, ,
22, Token, D22, D22, 266, ,
23, Token, "D22", , 267, ,
24, Token, D23, D23, 23, ,
25, Token, 'e', , 101, type_e,
26, Token, E25, E25, 25, type_e,
27, Token, "E25", , 268, type_e,
28, Token, E26, E26, 269, type_e,
29, Token, E27, E27, 270, type_e,
30, Token, "E28", , 271, type_e,
31, Token, E29, E29, 29, type_e,
32, Token, 'f', , 102, type_f,
33, Token, F30, F30, 30, type_f,
34, Token, "F30", , 272, type_f,
35, Token, F31, F31, 273, type_f,
36, Token, F32, F32, 274, type_f,
37, Token, "F32", , 275, type_f,
38, Token, F33, F33, 33, type_f,
39, Token, 'g', , 103, ,
40, Token, "D40", , 276, ,
41, Token, 'h', , 104, type_h,
42, Token, "H25", , 277, type_h,
43, Token, "H28", , 278, type_h,
44, Token, 'i', , 105, type_i,
45, Token, "I30", , 279, type_i,
46, Token, "I32", , 280, type_i,
47, Nonterminal, $accept, , -1, ,
48, Nonterminal, exp, exp, -1, ,
]])

AT_CLEANUP


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

AT_SETUP([Invalid $n and @n])

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

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.20-21: error: integer out of range: '$1'
    2 | exp: %empty { $$ = $1 ; };
      |                    ^~
input.y:3.20-21: error: integer out of range: '@1'
    3 | exp: %empty { @$ = @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: $$ for the midrule at $2 of 'exp' has no declared type
    5 | exp: foo { $$; } foo { $2; } foo
      |            ^~
input.y:5.24-25: error: $2 of 'exp' has no declared type
    5 | exp: foo { $$; } foo { $2; } foo
      |                        ^~
input.y:5.6-32: warning: type clash on default action: <bar> != <> [-Wother]
    5 | exp: foo { $$; } foo { $2; } foo
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:6.6-8: warning: type clash on default action: <bar> != <> [-Wother]
    6 |    | foo
      |      ^~~
input.y:7.6-11: warning: empty rule for typed nonterminal, and no action [-Wother]
    7 |    | %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 m n o;
%destructor { destroy ($$); } <integer>;]]])


# AT_CHECK_UNUSED_VALUES(DECLARATIONS_AFTER, CHECK_MIDRULE_VALUES)
# ----------------------------------------------------------------
# Generate a grammar to test unused values, and compile 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; }
| 'm' m { $][2; } | 'n' n { $][2; } | 'o' o { $][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; };
m: INT | INT <integer>{ $][$ = $][1; } INT <integer>{ $][$ = $][2 + $][3; } INT { $][$ = $][4 + $][5; };
n: INT | INT <integer>{ } INT <integer>{ } INT { };
o: INT | INT <integer>{ } INT <integer>{ } INT { $][$ = $][1 + $][2 + $][3 + $][4 + $][5; };
]]m4_ifval([$1], [
_AT_UNUSED_VALUES_DECLARATIONS])
)

AT_BISON_CHECK(m4_ifval([$2], [--warnings=midrule-values ])[-fcaret input.y],
               [0], [],
[[input.y:12.10-32: warning: unset value: $][$ [-Wother]
   12 | a: INT | INT { } INT { } INT { };
      |          ^~~~~~~~~~~~~~~~~~~~~~~
input.y:12.10-12: warning: unused value: $][1 [-Wother]
   12 | a: INT | INT { } INT { } INT { };
      |          ^~~
input.y:12.18-20: warning: unused value: $][3 [-Wother]
   12 | a: INT | INT { } INT { } INT { };
      |                  ^~~
input.y:12.26-28: warning: unused value: $][5 [-Wother]
   12 | a: INT | INT { } INT { } INT { };
      |                          ^~~
input.y:13.10-15: warning: empty rule for typed nonterminal, and no action [-Wother]
   13 | b: INT | %empty;
      |          ^~~~~~
]]m4_ifval([$2], [[[input.y:14.14-20: warning: unset value: $][$ [-Wmidrule-values]
   14 | c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
      |              ^~~~~~~
input.y:14.26-41: warning: unset value: $][$ [-Wmidrule-values]
   14 | c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
      |                          ^~~~~~~~~~~~~~~~
]]])[[input.y:14.10-62: warning: unset value: $][$ [-Wother]
   14 | c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:14.22-24: warning: unused value: $][3 [-Wother]
   14 | c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
      |                      ^~~
input.y:14.43-45: warning: unused value: $][5 [-Wother]
   14 | c: INT | INT { $][1; } INT { $<integer>2; } INT { $<integer>4; };
      |                                           ^~~
]]m4_ifval([$2], [[[input.y:15.14-16: warning: unset value: $][$ [-Wmidrule-values]
   15 | d: INT | INT { } INT { $][1; } INT { $<integer>2; };
      |              ^~~
]]])[[input.y:15.10-49: warning: unset value: $][$ [-Wother]
   15 | d: INT | INT { } INT { $][1; } INT { $<integer>2; };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:15.18-20: warning: unused value: $][3 [-Wother]
   15 | d: INT | INT { } INT { $][1; } INT { $<integer>2; };
      |                  ^~~
input.y:15.30-32: warning: unused value: $][5 [-Wother]
   15 | d: INT | INT { } INT { $][1; } INT { $<integer>2; };
      |                              ^~~
input.y:16.10-37: warning: unset value: $][$ [-Wother]
   16 | e: INT | INT { } INT {  } INT { $][1; };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:16.18-20: warning: unused value: $][3 [-Wother]
   16 | e: INT | INT { } INT {  } INT { $][1; };
      |                  ^~~
input.y:16.27-29: warning: unused value: $][5 [-Wother]
   16 | e: INT | INT { } INT {  } INT { $][1; };
      |                           ^~~
input.y:18.10-58: warning: unset value: $][$ [-Wother]
   18 | g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:18.10-12: warning: unused value: $][1 [-Wother]
   18 | g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
      |          ^~~
]]m4_ifval([$2], [[[input.y:18.14-29: warning: unused value: $][2 [-Wmidrule-values]
   18 | g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
      |              ^~~~~~~~~~~~~~~~
]]])[[input.y:18.31-33: warning: unused value: $][3 [-Wother]
   18 | g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
      |                               ^~~
]]m4_ifval([$2], [[[input.y:18.35-50: warning: unused value: $][4 [-Wmidrule-values]
   18 | g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
      |                                   ^~~~~~~~~~~~~~~~
]]])[[input.y:18.52-54: warning: unused value: $][5 [-Wother]
   18 | g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
      |                                                    ^~~
input.y:19.10-72: warning: unset value: $][$ [-Wother]
   19 | h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:19.10-12: warning: unused value: $][1 [-Wother]
   19 | h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
      |          ^~~
input.y:19.31-33: warning: unused value: $][3 [-Wother]
   19 | h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
      |                               ^~~
]]m4_ifval([$2], [[[input.y:19.35-64: warning: unused value: $][4 [-Wmidrule-values]
   19 | h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
]]])[[input.y:19.66-68: warning: unused value: $][5 [-Wother]
   19 | h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
      |                                                                  ^~~
]]m4_ifval([$2], [[[input.y:21.18-37: warning: unused value: $][3 [-Wmidrule-values]
   21 | j: INT | INT INT { $<integer>$ = 1; } { $][$ = $][1 + $][2; };
      |                  ^~~~~~~~~~~~~~~~~~~~
]]])[[input.y:22.10-68: warning: unset value: $][$ [-Wother]
   22 | k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:22.10-12: warning: unused value: $][1 [-Wother]
   22 | k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
      |          ^~~
input.y:22.14-16: warning: unused value: $][2 [-Wother]
   22 | k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
      |              ^~~
]]m4_ifval([$2], [[[input.y:22.35-64: warning: unused value: $][4 [-Wmidrule-values]
   22 | k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
]]])[[input.y:25.23-25: warning: unset value: $][$ [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |                       ^~~
input.y:25.40-42: warning: unset value: $][$ [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |                                        ^~~
input.y:25.10-50: warning: unset value: $][$ [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:25.10-12: warning: unused value: $][1 [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |          ^~~
input.y:25.23-25: warning: unused value: $][2 [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |                       ^~~
input.y:25.27-29: warning: unused value: $][3 [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |                           ^~~
input.y:25.40-42: warning: unused value: $][4 [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |                                        ^~~
input.y:25.44-46: warning: unused value: $][5 [-Wother]
   25 | n: INT | INT <integer>{ } INT <integer>{ } INT { };
      |                                            ^~~
input.y:26.23-25: warning: unset value: $][$ [-Wother]
   26 | o: INT | INT <integer>{ } INT <integer>{ } INT { $][$ = $][1 + $][2 + $][3 + $][4 + $][5; };
      |                       ^~~
input.y:26.40-42: warning: unset value: $][$ [-Wother]
   26 | o: INT | INT <integer>{ } INT <integer>{ } INT { $][$ = $][1 + $][2 + $][3 + $][4 + $][5; };
      |                                        ^~~
]])

])

## --------------- ##
## 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


## ------------------- ##
## Symbol redeclared.  ##
## ------------------- ##

AT_SETUP([Symbol redeclared])

AT_DATA([[input.y]],
[[%token FOO FOO
%token BAR 12 BAR 12
%token EOF 0 EOF 0
%%
exp: FOO BAR
]])

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:1.12-14: warning: symbol FOO redeclared [-Wother]
    1 | %token FOO FOO
      |            ^~~
input.y:1.8-10: note: previous declaration
    1 | %token FOO FOO
      |        ^~~
input.y:2.15-17: warning: symbol BAR redeclared [-Wother]
    2 | %token BAR 12 BAR 12
      |               ^~~
input.y:2.8-10: note: previous declaration
    2 | %token BAR 12 BAR 12
      |        ^~~
input.y:3.14-16: warning: symbol EOF redeclared [-Wother]
    3 | %token EOF 0 EOF 0
      |              ^~~
input.y:3.8-10: note: previous declaration
    3 | %token EOF 0 EOF 0
      |        ^~~
]])

AT_CLEANUP


## ---------------- ##
## EOF redeclared.  ##
## ---------------- ##

AT_SETUP([EOF redeclared])

# We used to crash when redefining a token after having defined EOF.
# See https://lists.gnu.org/r/bug-bison/2020-08/msg00008.html.

AT_DATA([[input.y]],
[[%token FOO BAR FOO 0
%%
input: %empty
]])

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:1.16-18: warning: symbol FOO redeclared [-Wother]
    1 | %token FOO BAR FOO 0
      |                ^~~
input.y:1.8-10: note: previous declaration
    1 | %token FOO BAR FOO 0
      |        ^~~
]])

AT_CLEANUP


## --------------------------- ##
## Symbol class redefinition.  ##
## --------------------------- ##

AT_SETUP([Symbol class redefinition])

AT_DATA([[input.y]],
[[%token FOO
%nterm FOO BAR
%token BAR
%nterm error // The token error cannot be redefined as an nterm.
%%
FOO: BAR
BAR:
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.8-10: error: symbol FOO redeclared as a nonterminal
    2 | %nterm FOO BAR
      |        ^~~
input.y:1.8-10: note: previous definition
    1 | %token FOO
      |        ^~~
input.y:3.8-10: error: symbol BAR redeclared as a token
    3 | %token BAR
      |        ^~~
input.y:2.12-14: note: previous definition
    2 | %nterm FOO BAR
      |            ^~~
input.y:4.8-12: error: symbol error redeclared as a nonterminal
    4 | %nterm error // The token error cannot be redefined as an nterm.
      |        ^~~~~
input.y:6.1-3: error: rule given for FOO, which is a token
    6 | FOO: BAR
      | ^~~
]])

AT_CLEANUP


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

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

# AT_TEST([*])
# ------------
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <$1> <$1>
%printer { print ($$); } <$1> <$1>

%destructor { destroy ($$); } <$1>
%printer { print ($$); } <$1>

%%

start: %empty;

%destructor { destroy ($$); } <$1>;
%printer { print ($$); } <$1>;
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:1.13-29: error: %destructor redeclaration for <>
    1 | %destructor { destroy ($$); } <> <>
      |             ^~~~~~~~~~~~~~~~~
input.y:1.13-29: note: previous declaration
    1 | %destructor { destroy ($$); } <> <>
      |             ^~~~~~~~~~~~~~~~~
input.y:2.10-24: error: %printer redeclaration for <>
    2 | %printer { print ($$); } <> <>
      |          ^~~~~~~~~~~~~~~
input.y:2.10-24: note: previous declaration
    2 | %printer { print ($$); } <> <>
      |          ^~~~~~~~~~~~~~~
input.y:4.13-29: error: %destructor redeclaration for <>
    4 | %destructor { destroy ($$); } <>
      |             ^~~~~~~~~~~~~~~~~
input.y:1.13-29: note: previous declaration
    1 | %destructor { destroy ($$); } <> <>
      |             ^~~~~~~~~~~~~~~~~
input.y:5.10-24: error: %printer redeclaration for <>
    5 | %printer { print ($$); } <>
      |          ^~~~~~~~~~~~~~~
input.y:2.10-24: note: previous declaration
    2 | %printer { print ($$); } <> <>
      |          ^~~~~~~~~~~~~~~
input.y:11.13-29: error: %destructor redeclaration for <>
   11 | %destructor { destroy ($$); } <>;
      |             ^~~~~~~~~~~~~~~~~
input.y:1.13-29: note: previous declaration
    1 | %destructor { destroy ($$); } <> <>
      |             ^~~~~~~~~~~~~~~~~
input.y:12.10-24: error: %printer redeclaration for <>
   12 | %printer { print ($$); } <>;
      |          ^~~~~~~~~~~~~~~
input.y:2.10-24: note: previous declaration
    2 | %printer { print ($$); } <> <>
      |          ^~~~~~~~~~~~~~~
]])
])

AT_TEST([], [], [])
AT_TEST([], [*], [*])
m4_popdef([AT_TEST])

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: %empty;

%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: note: previous declaration
input.y:4.13-29: error: %destructor redeclaration for <field1>
input.y:1.13-29: note: previous declaration
input.y:5.10-24: error: %printer redeclaration for <field2>
input.y:2.10-24: note: previous declaration
input.y:5.10-24: error: %printer redeclaration for <field2>
input.y:2.10-24: note: previous declaration
input.y:11.13-29: error: %destructor redeclaration for <field2>
input.y:1.13-29: note: previous declaration
input.y:11.13-29: error: %destructor redeclaration for <field1>
input.y:1.13-29: note: previous declaration
input.y:12.10-24: error: %printer redeclaration for <field2>
input.y:2.10-24: note: previous declaration
input.y:12.10-24: error: %printer redeclaration for <field1>
input.y:2.10-24: note: 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:1.13-15: warning: symbol 'foo' is used, but is not defined as a token and has no rules [-Wother]
    1 | %printer {} foo baz
      |             ^~~
input.y:1.17-19: warning: symbol 'baz' is used, but is not defined as a token and has no rules [-Wother]
    1 | %printer {} foo baz
      |                 ^~~
input.y:2.16-18: error: symbol 'bar' is used, but is not defined as a token and has no rules
    2 | %destructor {} bar
      |                ^~~
input.y:3.13-15: warning: symbol 'qux' is used, but is not defined as a token and has no rules [-Wother]
    3 | %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: $$ [-Wother]
    6 | start: end end tagged tagged { $<tag>1; $3; } ;
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:6.12-14: warning: unused value: $2 [-Wother]
    6 | start: end end tagged tagged { $<tag>1; $3; } ;
      |            ^~~
input.y:7.6-8: warning: unset value: $$ [-Wother]
    7 | 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: $$ [-Wother]
    6 | start: end end { $1; } ;
      |        ^~~~~~~~~~~~~~~
input.y:6.12-14: warning: unused value: $2 [-Wother]
    6 | start: end end { $1; } ;
      |            ^~~
input.y:7.6-8: warning: unset value: $$ [-Wother]
    7 | end: { }  ;
      |      ^~~
]])

AT_CLEANUP


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


AT_SETUP([Duplicate string])

AT_BISON_OPTION_PUSHDEFS
AT_DATA([input.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_BISON_OPTION_POPDEFS

AT_BISON_CHECK([-v -o input.c input.y], 0, [],
[[input.y:6.11-14: warning: symbol "<=" used more than once as a literal string [-Wother]
]])

AT_CLEANUP


## ------------------ ##
## Token collisions.  ##
## ------------------ ##

AT_SETUP([Token collisions])

AT_DATA([[input.y]],
[[%token FOO 42 "foo"
         BAR 42 "foo"
%%
exp: FOO BAR;
]])

AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.17-21: warning: symbol "foo" used more than once as a literal string [-Wother]
    2 |          BAR 42 "foo"
      |                 ^~~~~
input.y:2.10-12: error: code 42 reassigned to token BAR
    2 |          BAR 42 "foo"
      |          ^~~
input.y:1.15-19: note: previous declaration for "foo"
    1 | %token FOO 42 "foo"
      |               ^~~~~
]])

AT_CLEANUP


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

AT_SETUP([Incompatible Aliases])

m4_pushdef([AT_TEST],
[AT_DATA([input.y], [$1])
AT_BISON_CHECK([-fcaret input.y], [1], [], [$2])
])

# Use the string-alias first to check the order between "first
# declaration" and second.

AT_TEST([[%token foo "foo"
%type <bar> "foo"
%type <baz> foo
%%
exp: foo;
]],
[[input.y:3.13-15: error: %type redeclaration for foo
    3 | %type <baz> foo
      |             ^~~
input.y:2.13-17: note: previous declaration
    2 | %type <bar> "foo"
      |             ^~~~~
]])

AT_TEST([[%token foo "foo"
%printer {bar} "foo"
%printer {baz} foo
%%
exp: foo;
]],
[[input.y:3.10-14: error: %printer redeclaration for foo
    3 | %printer {baz} foo
      |          ^~~~~
input.y:2.10-14: note: previous declaration
    2 | %printer {bar} "foo"
      |          ^~~~~
]])

AT_TEST([[%token foo "foo"
%destructor {bar} "foo"
%destructor {baz} foo
%%
exp: foo;
]],
[[input.y:3.13-17: error: %destructor redeclaration for foo
    3 | %destructor {baz} foo
      |             ^~~~~
input.y:2.13-17: note: previous declaration
    2 | %destructor {bar} "foo"
      |             ^~~~~
]])

AT_TEST([[%token foo "foo"
%left "foo"
%left foo
%%
exp: foo;
]],
[[input.y:3.1-5: error: %left redeclaration for foo
    3 | %left foo
      | ^~~~~
input.y:2.1-5: note: previous declaration
    2 | %left "foo"
      | ^~~~~
]])

# This time, declare the alias after its use.

# Precedence/associativity.
AT_TEST([[%left "foo"
%left foo
%token foo "foo"
%%
exp: foo;
]],
[[input.y:2.1-5: error: %left redeclaration for foo
    2 | %left foo
      | ^~~~~
input.y:1.1-5: note: previous declaration
    1 | %left "foo"
      | ^~~~~
]])

# Printer.
AT_TEST([[%printer {} "foo"
%printer {} foo
%token foo "foo"
%%
exp: foo;
]],
[[input.y:2.10-11: error: %printer redeclaration for foo
    2 | %printer {} foo
      |          ^~
input.y:1.10-11: note: previous declaration
    1 | %printer {} "foo"
      |          ^~
]])

# Destructor.
AT_TEST([[%destructor {} "foo"
%destructor {} foo
%token foo "foo"
%%
exp: foo;
]],
[[input.y:2.13-14: error: %destructor redeclaration for foo
    2 | %destructor {} foo
      |             ^~
input.y:1.13-14: note: previous declaration
    1 | %destructor {} "foo"
      |             ^~
]])

m4_popdef([AT_TEST])
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([-fcaret  input.y], [1], [],
[[input.y:1.1-2: error: unexpected {...}
    1 | {}
      | ^~
]])


# Clang chokes on some of our comments, because it tries to "parse"
# some documentation directives in the comments:
#
# input.c:166:50: error: '\a' command does not have a valid word argument [-Werror,-Wdocumentation]
#     FAKE = 258                     /* "fake [] \a\b\f\n\r\t\v\"'?\\[\\ ??!??'??(??)??-??/??<??=??> \001\001"  */
#                                                ~~^
AT_DATA_GRAMMAR([input.y],
[[%code requires {
#if defined __clang__ && 10 <= __clang_major__
# pragma clang diagnostic ignored "-Wdocumentation"
#endif
}

%{
/* 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"

/* Beware of the generated comments that embed string aliases that
   might close the comment.  */
%token COMMENT_CLOSE "*/"
%token COMMENT       "/* comment */"

%%
/* 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: %empty;|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 "; /* "
  */
  enum { input_elts = sizeof input };
  (void) input_elts;
  static int toknum;
  assert (0 <= toknum && toknum < input_elts);
  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_BISON_OPTION_PUSHDEFS

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_BISON_OPTION_POPDEFS
AT_CLEANUP


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

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

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

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

AT_BISON_OPTION_POPDEFS
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[
]])

# POSIX Yacc accept periods, but not dashes.
AT_BISON_CHECK([--yacc input.y], [], [],
[[input.y:1.1-5: warning: POSIX Yacc does not support %code [-Wyacc]
input.y:9.8-16: warning: POSIX Yacc forbids dashes in symbol names: WITH-DASH [-Wyacc]
input.y:10.21-34: warning: POSIX Yacc does not support string literals [-Wyacc]
input.y:12.23-38: warning: POSIX Yacc does not support string literals [-Wyacc]
input.y:13.1-5: warning: POSIX Yacc does not support %code [-Wyacc]
input.y:20.8-16: warning: POSIX Yacc forbids dashes in symbol names: with-dash [-Wyacc]
input.y:22.15-28: warning: POSIX Yacc does not support string literals [-Wyacc]
input.y:24.17-32: warning: POSIX Yacc does not support string literals [-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_BISON_OPTION_POPDEFS
AT_CLEANUP


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

AT_SETUP([Numbered tokens])

AT_BISON_OPTION_PUSHDEFS
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: code 11259375 reassigned to token HEXADECIMAL_1
redecl.y:9.8-16: note: previous declaration for DECIMAL_1
redecl.y:12.10-18: error: code 16702650 reassigned to token DECIMAL_2
redecl.y:11.10-22: note: 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:9.22-42: error: code of token TOO_LARGE_DEC too large
too-large.y:10.24-44: error: integer out of range: '0xFFFFFFFFFFFFFFFFFFF'
too-large.y:10.24-44: error: code of token TOO_LARGE_HEX too large
]])

AT_BISON_OPTION_POPDEFS
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: %empty;

// 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
    1 | %token A "a
      |          ^~
input.y:4.10-5.0: error: missing "'" at end of line
    4 | %token C '1
      |          ^~
input.y:14.11-15.0: error: missing "'" at end of line
   14 | %type <f> 'a
      |           ^~
input.y:16.11-17.0: error: missing '"' at end of line
   16 | %type <f> "a
      |           ^~
input.y:19.13-20.0: error: missing '}' at end of file
   19 | %destructor { free ($$)
      |             ^~~~~~~~~~~
input.y:20.1: 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: %empty;
start: false_start ;
%start start;
]])

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

AT_CLEANUP


## ------------------------- ##
## Duplicate %start symbol.  ##
## ------------------------- ##

AT_SETUP([Duplicate %start symbol])

AT_KEYWORDS([multistart])

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

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:1.12-14: warning: duplicate directive [-Wother]
    1 | %start exp exp exp
      |            ^~~
input.y:1.8-10: note: previous declaration
    1 | %start exp exp exp
      |        ^~~
input.y:1.16-18: warning: duplicate directive [-Wother]
    1 | %start exp exp exp
      |                ^~~
input.y:1.8-10: note: previous declaration
    1 | %start exp exp exp
      |        ^~~
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

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

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:1.16-18: warning: duplicate directive [-Wother]
    1 | %start exp foo exp
      |                ^~~
input.y:1.8-10: note: previous declaration
    1 | %start exp foo exp
      |        ^~~
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

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

AT_BISON_CHECK([-fcaret input.y], [0], [],
[[input.y:2.8-10: warning: duplicate directive [-Wother]
    2 | %start exp
      |        ^~~
input.y:1.8-10: note: previous declaration
    1 | %start exp foo
      |        ^~~
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])


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: %empty;
]])

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: %empty;
]])
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: %empty;
]])
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: %empty;
]])
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: %empty;
]])
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: %empty;
]])
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: %empty;
]])
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


## ---------------- ##
## Multiple %code.  ##
## ---------------- ##

AT_SETUP([Multiple %code])

# Make sure that repeated arguments to %code are separated by
# end-of-lines.  At some point, a missing eol would leave synclines
# appended to the previous value.  Here, we use CPP directive to
# introduce dependency on the absence/presence of the eol.
AT_BISON_OPTION_PUSHDEFS

AT_DATA([input.y],
[[%code {#include <assert.h>}
%code {#define A B}
%code {#define B C}
%code {#define C D}
%code {#define D 42}
%code {
  ]AT_YYERROR_DECLARE[
  ]AT_YYLEX_DECLARE[
}
%%
start: %empty;
%%
]AT_YYERROR_DEFINE[
]AT_YYLEX_DEFINE[
int main (void)
{
  assert (A == 42);
  return 0;
}
]])
AT_FULL_COMPILE([input])
AT_PARSER_CHECK([input])

AT_BISON_OPTION_POPDEFS
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: %empty;
]])

AT_BISON_CHECK([[input-redefined.y]], [[1]], [],
[[input-redefined.y:2.1-20: warning: %define variable 'var' redefined [-Wother]
input-redefined.y:1.1-20: note: previous definition
input-redefined.y:3.2-21: error: %define variable 'var' redefined
input-redefined.y:2.1-20: note: previous definition
input-redefined.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

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

AT_BISON_CHECK([[input-unused.y]], [[1]], [],
[[input-unused.y:1.1-19: 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: %empty;
]])
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: %empty;
]])
AT_BISON_CHECK([[-Dvar=cmd-d input-dg.y]], [[1]], [],
[[input-dg.y:1.1-18: error: %define variable 'var' redefined
<command line>:3: note: previous definition
input-dg.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_DATA([[input-dg.y]],
[[%define var "gram"
%%
start: %empty;
]])
AT_BISON_CHECK([[-fcaret -Dvar=cmd-d input-dg.y]], [[1]], [],
[[input-dg.y:1.1-18: error: %define variable 'var' redefined
    1 | %define var "gram"
      | ^~~~~~~~~~~~~~~~~~
<command line>:4: note: previous definition
input-dg.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_DATA([[input-unused.y]],
[[%%
start: %empty;
]])
AT_BISON_CHECK([[-Dunused-d -Funused-f input-unused.y]], [[1]], [],
[[<command line>:3: error: %define variable 'unused-d' is not used
<command line>:4: 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 api.parser.class {Input}
%define api.parser.public {maybe}
%%
start: %empty;
]])

AT_BISON_CHECK([[Input.y]], [1], [],
[[Input.y:3.1-33: error: invalid value for %define Boolean variable 'api.parser.public'
]])

AT_CLEANUP


## ------------------------ ##
## %define code variables.  ##
## ------------------------ ##

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

m4_pushdef([AT_TEST],
[AT_DATA([input.yy],
[[%skeleton "lalr1.cc" %locations
%define api.location.type ]$1[quux]$2[
%define api.namespace     ]$1[quux]$2[
%define api.prefix        ]$1[quux]$2[
%define api.token.prefix  ]$1[quux]$2[
%token TOK // Otherwise api.token.prefix is unused.
%%
start: TOK;
]])

AT_BISON_CHECK([[input.yy]], [0], [],
[[input.yy:2.$3: warning: %define variable 'api.location.type' requires '{...}' values [-Wdeprecated]
input.yy:4.$3: warning: %define variable 'api.prefix' requires '{...}' values [-Wdeprecated]
input.yy:5.$3: warning: %define variable 'api.token.prefix' requires '{...}' values [-Wdeprecated]
input.yy:3.$3: warning: %define variable 'api.namespace' requires '{...}' values [-Wdeprecated]
]])
])

AT_TEST([],  [],  [1-30])
AT_TEST(["], ["], [1-32])
m4_popdef([AT_TEST])

AT_CLEANUP


## --------------------------- ##
## %define keyword variables.  ##
## --------------------------- ##

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

m4_pushdef([AT_TEST],
[AT_DATA([input.y],
[[%define api.pure                ]$1[true]$2[
%define api.push-pull             ]$1[both]$2[
%define lr.default-reduction      ]$1[most]$2[
%define lr.keep-unreachable-state ]$1[true]$2[
%define lr.type                   ]$1[lalr]$2[
%%
exp: %empty
]])

AT_BISON_CHECK([[input.y]], [0], [],
[[input.y:5.1-40: warning: %define variable 'lr.type' requires keyword values [-Wdeprecated]
input.y:3.1-40: warning: %define variable 'lr.default-reduction' requires keyword values [-Wdeprecated]
input.y:4.1-40: warning: %define variable 'lr.keep-unreachable-state' requires keyword values [-Wdeprecated]
input.y:1.1-38: warning: %define variable 'api.pure' requires keyword values [-Wdeprecated]
input.y:2.1-40: warning: %define variable 'api.push-pull' requires keyword values [-Wdeprecated]
]])
])

AT_TEST(["], ["])
AT_TEST([{], [}])
m4_popdef([AT_TEST])

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: %empty;
]])
AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:1.1-34: error: invalid value for %define variable 'lr.default-reduction': 'bogus'
    1 | %define lr.default-reduction bogus
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:1.1-34: note: accepted value: 'most'
input.y:1.1-34: note: accepted value: 'consistent'
input.y:1.1-34: note: accepted value: 'accepting'
]])

# Check escapes.
AT_DATA([[input.y]],
[[%define lr.default-reduction {[$@]}
%%
start: %empty;
]])
AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:1.1-35: warning: %define variable 'lr.default-reduction' requires keyword values [-Wdeprecated]
    1 | %define lr.default-reduction {[$@]}
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:1.1-35: error: invalid value for %define variable 'lr.default-reduction': '[$@]'
    1 | %define lr.default-reduction {[$@]}
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:1.1-35: note: accepted value: 'most'
input.y:1.1-35: note: accepted value: 'consistent'
input.y:1.1-35: note: accepted value: 'accepting'
]])


# Back-end.
AT_DATA([[input.y]],
[[%define api.push-pull neither
%%
start: %empty;
]])
AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:1.1-29: error: invalid value for %define variable 'api.push-pull': 'neither'
    1 | %define api.push-pull neither
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y:1.1-29: note: accepted value: 'pull'
input.y:1.1-29: note: accepted value: 'push'
input.y:1.1-29: note: accepted value: 'both'
]])

AT_CLEANUP



## ------------------------ ##
## %define file variables.  ##
## ------------------------ ##

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

AT_DATA([[input.y]],
[[%skeleton "lalr1.cc"
%locations
%define api.location.file {bogus}
%%
start: %empty;
]])
AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:3.1-33: error: %define variable 'api.location.file' requires 'none' or '"..."' values
    3 | %define api.location.file {bogus}
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
]])

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 variant
%define parser_class_name {parser}
%define filename_type {filename}
%%
start: %empty;
]])
AT_BISON_CHECK([[-fcaret input.y]], [1], [],
[[input.y:1.1-26: warning: deprecated directive: '%define api.push_pull both', use '%define api.push-pull both' [-Wdeprecated]
    1 | %define api.push_pull both
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~
      | %define api.push-pull both
input.y:2.1-40: warning: deprecated directive: '%define lr.keep_unreachable_states maybe', use '%define lr.keep-unreachable-state maybe' [-Wdeprecated]
    2 | %define lr.keep_unreachable_states maybe
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      | %define lr.keep-unreachable-state maybe
input.y:3.1-23: warning: deprecated directive: '%define namespace "foo"', use '%define api.namespace {foo}' [-Wdeprecated]
    3 | %define namespace "foo"
      | ^~~~~~~~~~~~~~~~~~~~~~~
      | %define api.namespace {foo}
input.y:4.1-15: warning: deprecated directive: '%define variant', use '%define api.value.type variant' [-Wdeprecated]
    4 | %define variant
      | ^~~~~~~~~~~~~~~
      | %define api.value.type variant
input.y:5.1-34: warning: deprecated directive: '%define parser_class_name {parser}', use '%define api.parser.class {parser}' [-Wdeprecated]
    5 | %define parser_class_name {parser}
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      | %define api.parser.class {parser}
input.y:6.1-32: warning: deprecated directive: '%define filename_type {filename}', use '%define api.filename.type {filename}' [-Wdeprecated]
    6 | %define filename_type {filename}
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      | %define api.filename.type {filename}
input.y:2.1-40: error: invalid value for %define Boolean variable 'lr.keep-unreachable-state'
    2 | %define lr.keep_unreachable_states maybe
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_CLEANUP


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

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

# AT_TEST(DECLS, VALUE, LOCATION)
# -------------------------------
# Make sure Bison reports that '%define api.pure VALUE' is unused when DECLS
# are specified.
m4_pushdef([AT_TEST],
[
AT_DATA([[input.y]],
[[%define api.pure ]$2[
]$1[
%%
start: %empty;
]])

AT_BISON_CHECK([[input.y]], [[1]], [],
[[input.y:]$3[: error: %define variable 'api.pure' is not used
]])
])

AT_TEST([[%language "c++"]],             [[]],      [[1.1-16]])
AT_TEST([[%language "c++"]],             [[false]], [[1.1-22]])
AT_TEST([[%language "c++" %glr-parser]], [[""]],    [[1.1-19]])
AT_TEST([[%language "c++" %glr-parser]], [[false]], [[1.1-22]])
AT_TEST([[%language "java"]],            [[true]],  [[1.1-21]])
AT_TEST([[%language "java"]],            [[false]], [[1.1-22]])

m4_popdef([AT_TEST])

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++"
%header
%define api.namespace {]$1[}
%%
start: %empty;
]])

AT_BISON_CHECK([[input.y]], [1], [],
[m4_foreach([b4_arg], m4_dquote(m4_shift($@)),
[b4_arg
])])
])

AT_CHECK_NAMESPACE_ERROR([[]],
                         [[input.y:3.1-24: error: namespace reference is empty]])
AT_CHECK_NAMESPACE_ERROR([[ @tb@@tb@  @tb@ @tb@]],
                         [[input.y:3.1-57: error: namespace reference is empty]])
AT_CHECK_NAMESPACE_ERROR([[foo::::bar]],
                         [[input.y:3.1-34: error: namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo:: @tb@::bar]],
                         [[input.y:3.1-38: error: namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[::::bar]],
                         [[input.y:3.1-31: error: namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[:: ::bar]],
                         [[input.y:3.1-32: error: namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar::@tb@::]],
                         [[input.y:3.1-43: error: namespace reference has consecutive "::"]],
                         [[input.y:3.1-43: error: namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar::]],
                         [[input.y:3.1-34: error: namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar:: @tb@]],
                         [[input.y:3.1-41: error: namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[::]],
                         [[input.y:3.1-26: 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.

AT_SETUP([[Bad character literals]])

AT_DATA_NO_FINAL_EOL([empty.y],
[[%%
start: '';
start: '
start: ']])

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

AT_DATA_NO_FINAL_EOL([two.y],
[[%%
start: 'ab';
start: 'ab
start: 'ab]])

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

AT_DATA_NO_FINAL_EOL([three.y],
[[%%
start: 'abc';
start: 'abc
start: 'abc]])

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

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_PERL_REQUIRE([[-e 'print "start: \"\\\t\\\f\\\0\\\1\" ;";' >> input.y]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:2.9-12: error: invalid number after \-escape: 777
input.y:2.16-17: error: invalid number after \-escape: 0
input.y:2.21-25: error: invalid number after \-escape: xfff
input.y:2.29-31: error: invalid number after \-escape: x0
input.y:3.9-14: error: invalid number after \-escape: uffff
input.y:3.18-23: error: invalid number after \-escape: u0000
input.y:3.27-36: error: invalid number after \-escape: Uffffffff
input.y:3.40-49: error: invalid number after \-escape: U00000000
input.y:4.9-10: error: invalid character after \-escape: ' '
input.y:4.14-15: error: invalid character after \-escape: A
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


## ------------------------ ##
## Unexpected end of file.  ##
## ------------------------ ##

AT_SETUP([[Unexpected end of file]])


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


AT_DATA_NO_FINAL_EOL([char.y],
[[%token FOO ']])

AT_BISON_CHECK([-fcaret char.y], [1], [],
[[char.y:1.12: error: missing "'" at end of file
    1 | %token FOO '
      |            ^
char.y:1.12: error: empty character literal
    1 | %token FOO '
      |            ^
]])


AT_DATA_NO_FINAL_EOL([escape-in-char.y],
[[%token FOO '\]])

AT_BISON_CHECK([-fcaret escape-in-char.y], [1], [],
[[escape-in-char.y:1.12-13: error: missing '?\'' at end of file
    1 | %token FOO '\
      |            ^~
escape-in-char.y:1.14: error: unexpected end of file
    1 | %token FOO '\
      |              ^
]])


AT_DATA_NO_FINAL_EOL([string.y],
[[%token FOO "]])

AT_BISON_CHECK([-fcaret string.y], [1], [],
[[string.y:1.12: error: missing '"' at end of file
    1 | %token FOO "
      |            ^
string.y:1.13: error: unexpected end of file
    1 | %token FOO "
      |             ^
]])


AT_DATA_NO_FINAL_EOL([escape-in-string.y],
[[%token FOO "\]])

AT_BISON_CHECK([-fcaret escape-in-string.y], [1], [],
[[escape-in-string.y:1.12-13: error: missing '?"' at end of file
    1 | %token FOO "\
      |            ^~
escape-in-string.y:1.14: error: unexpected end of file
    1 | %token FOO "\
      |              ^
]])


AT_DATA_NO_FINAL_EOL([tstring.y],
[[%token FOO _("]])

AT_BISON_CHECK([-fcaret tstring.y], [1], [],
[[tstring.y:1.12-14: error: missing '")' at end of file
    1 | %token FOO _("
      |            ^~~
tstring.y:1.15: error: unexpected end of file
    1 | %token FOO _("
      |               ^
]])


AT_DATA_NO_FINAL_EOL([escape-in-tstring.y],
[[%token FOO _("\]])

AT_BISON_CHECK([-fcaret escape-in-tstring.y], [1], [],
[[escape-in-tstring.y:1.12-15: error: missing '?")' at end of file
    1 | %token FOO _("\
      |            ^~~~
escape-in-tstring.y:1.16: error: unexpected end of file
    1 | %token FOO _("\
      |                ^
]])

AT_CLEANUP


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

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

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

# Only "full" and "none" are accepted for parse.lac
# Unknown values (such as "unsupported") are rejected
m4_foreach([b4_skel], [[yacc.c], [lalr1.cc], [lalr1.d], [lalr1.java]],
[AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=none input.y]])
AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=full input.y]])
AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=unsupported input.y]],
               [[1]], [],
[[<command line>:4: error: invalid value for %define variable 'parse.lac': 'unsupported'
<command line>:4: note: accepted value: 'full'
<command line>:4: note: accepted value: 'none'
]])
])

# parse.lac.* options are useless if LAC isn't actually activated.
AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 -Dparse.lac.memory-trace=full input.y]],
               [[1]], [],
[[<command line>:3: error: %define variable 'parse.lac.es-capacity-initial' is not used
<command line>:4: error: %define variable 'parse.lac.memory-trace' is not used
]])

# parse.lac.* options are useless in C++/Java even if LAC is actually activated.
m4_foreach([b4_skel], [[lalr1.cc], [lalr1.java]],
[AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=full -Dparse.lac.es-capacity-initial=1 -Dparse.lac.memory-trace=full input.y]],
               [[1]], [],
[[<command line>:5: error: %define variable 'parse.lac.es-capacity-initial' is not used
<command line>:6: error: %define variable 'parse.lac.memory-trace' is not used
]])
])

AT_CLEANUP


## ---------------------- ##
## -Werror combinations.  ##
## ---------------------- ##

AT_SETUP([[-Werror combinations]])

AT_DATA([[input.y]],
[[%%
a: '0' { $$ = $; };
]])

# -Werror is not enabled by -Wall or equivalent.
AT_BISON_CHECK([[-Wall input.y]], [[0]], [[]],
[[input.y:2.15: warning: stray '$' [-Wother]
]])
AT_BISON_CHECK([[-W input.y]], [[0]], [[]],
[[input.y:2.15: warning: stray '$' [-Wother]
]])
AT_BISON_CHECK([[-Wno-none input.y]], [[0]], [[]],
[[input.y:2.15: warning: stray '$' [-Wother]
]])

# -Werror is not disabled by -Wnone or equivalent.
AT_BISON_CHECK([[-Werror,none,other input.y]], [[1]], [[]],
[[input.y:2.15: error: stray '$' [-Werror=other]
]])
AT_BISON_CHECK([[-Werror,no-all,other input.y]], [[1]], [[]],
[[input.y:2.15: error: stray '$' [-Werror=other]
]])

# Check that -Wno-error keeps warnings enabled, but non fatal.
AT_BISON_CHECK([[-Werror -Wno-error=other input.y]], [[0]], [[]],
[[input.y:2.15: warning: stray '$' [-Wother]
]])

AT_BISON_CHECK([[-Wno-error=other -Werror input.y]], [[0]], [[]],
[[input.y:2.15: warning: stray '$' [-Wother]
]])

AT_BISON_CHECK([[-Werror=other -Wno-other input.y]], [[0]], [[]],
[[]])

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 -Wno-deprecated 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:1.1-24])
AT_TEST([], [-Dapi.prefix={foo} -p bar],                   [<command line>:3])
AT_TEST([%name-prefix "bar"], [-Dapi.prefix={foo}],        [<command line>:3])
AT_TEST([%define api.prefix {foo}], [-p bar],              [input.y:1.1-24])

m4_popdef([AT_TEST])

AT_CLEANUP


## ----------------------- ##
## Redefined %union name.  ##
## ----------------------- ##

AT_SETUP([[Redefined %union name]])

# AT_TEST(DIRECTIVES, EXIT-STATUS, ERROR)
# ---------------------------------------
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[$1
%%
exp: %empty;
])

AT_BISON_CHECK([[input.y]], [$2], [[]],
[$3])
])

AT_TEST([[%union foo {};
%union {};
%union foo {};
%define api.value.union.name foo]],
[0],
[[input.y:3.8-10: warning: %define variable 'api.value.union.name' redefined [-Wother]
input.y:1.8-10: note: previous definition
input.y:4.1-32: warning: %define variable 'api.value.union.name' redefined [-Wother]
input.y:3.8-10: note: previous definition
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_TEST([[%define api.value.union.name {foo}]], [1],
[[input.y:1.1-34: error: %define variable 'api.value.union.name' requires keyword values
input.y:1.1-34: error: %define variable 'api.value.union.name' is not used
]])

AT_TEST([[%define api.value.union.name "foo"]], [1],
[[input.y:1.1-34: error: %define variable 'api.value.union.name' requires keyword values
input.y:1.1-34: error: %define variable 'api.value.union.name' is not used
]])

m4_popdef([AT_TEST])
AT_CLEANUP




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

AT_SETUP([[Stray $ or @]])
AT_BISON_OPTION_PUSHDEFS

# 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        { $%; @%; $$ = $1; }
   | 'a'        { $<->1; $$ = 1; }
   | 'b'        { $<foo->bar>$; }
%%
$ @ // 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]
input.y:17.19: warning: stray '$' [-Wother]
]])

AT_BISON_OPTION_POPDEFS
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(%type)> exp
%token <$1(%token)> a
%token b
%initial-action
{
  $$;
  $<$1(%initial-action)>$
};
%printer
{
  $$
  $<$1(%printer)>$
} <> <*>;
%lex-param
{
  $1(%lex-param)
};
%parse-param
{
  $1(%parse-param)
};
%%
exp:
  a a[name] b
  {
    $$;
    $][1;
    $<$1(action 1)>$
    $<$1(action 2)>1
    $<$1(action 3)>name
    $<$1(action 4)>0
    ;
  };
]])

# Disable -Wother to avoid the warnings about the suspicious presence
# of `b4_canary` in the output.
AT_FOR_EACH_SKEL(
[AT_BISON_CHECK([[-Wno-other -S ]b4_skel[ ]m4_bmatch(b4_skel, [.*\.\(d\|java\)$], [], [-d])[ input.y]])
])
])

AT_TEST([b4_canary])
AT_TEST([@:>@b4_canary])

m4_popdef([AT_TEST])

AT_CLEANUP


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

AT_SETUP([[Deprecated directives]])

AT_KEYWORDS([[deprec]])

AT_BISON_OPTION_PUSHDEFS
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 = "output.c"
%pure_parser
%token_table
%error-verbose
%glr-parser
%name-prefix "bar"
%defines "header.h"
%%
exp : '0'
]])

AT_DATA([errors-all],
[[input.y:10.1-13: warning: deprecated directive: '%default_prec', use '%default-prec' [-Wdeprecated]
fix-it:"input.y":{10:1-10:14}:"%default-prec"
input.y:11.1-14: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
fix-it:"input.y":{11:1-11:15}:"%define parse.error verbose"
input.y:12.1-10: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
fix-it:"input.y":{12:1-12:11}:"%expect-rr"
input.y:13.1-14: warning: deprecated directive: '%file-prefix =', use '%file-prefix' [-Wdeprecated]
fix-it:"input.y":{13:1-13:15}:"%file-prefix"
input.y:14.1-16.5: warning: duplicate directive: '%file-prefix\n =' [-Wother]
input.y:13.1-20: note: previous declaration
fix-it:"input.y":{14:1-16:6}:""
input.y:17.9-27: warning: deprecated directive: '%fixed-output_files', use '%output "y.tab.c"' [-Wdeprecated]
fix-it:"input.y":{17:2-17:21}:"%output \"y.tab.c\""
input.y:18.9-27: warning: deprecated directive: '%fixed_output-files', use '%output "y.tab.c"' [-Wdeprecated]
fix-it:"input.y":{18:9-18:28}:"%output \"y.tab.c\""
input.y:19.1-19: warning: deprecated directive: '%fixed-output-files', use '%output "y.tab.c"' [-Wdeprecated]
fix-it:"input.y":{19:1-19:20}:"%output \"y.tab.c\""
input.y:20.1-19: warning: deprecated directive: '%name-prefix= "foo"', use '%define api.prefix {foo}' [-Wdeprecated]
fix-it:"input.y":{20:1-20:20}:"%define api.prefix {foo}"
input.y:21.1-16: warning: deprecated directive: '%no-default_prec', use '%no-default-prec' [-Wdeprecated]
fix-it:"input.y":{21:1-21:17}:"%no-default-prec"
input.y:22.1-16: warning: deprecated directive: '%no_default-prec', use '%no-default-prec' [-Wdeprecated]
fix-it:"input.y":{22:1-22:17}:"%no-default-prec"
input.y:23.1-9: warning: deprecated directive: '%no_lines', use '%no-lines' [-Wdeprecated]
fix-it:"input.y":{23:1-23:10}:"%no-lines"
input.y:24.1-9: warning: deprecated directive: '%output =', use '%output' [-Wdeprecated]
fix-it:"input.y":{24:1-24:10}:"%output"
input.y:25.1-12: warning: deprecated directive: '%pure_parser', use '%define api.pure' [-Wdeprecated]
fix-it:"input.y":{25:1-25:13}:"%define api.pure"
input.y:26.1-12: warning: deprecated directive: '%token_table', use '%token-table' [-Wdeprecated]
fix-it:"input.y":{26:1-26:13}:"%token-table"
input.y:27.1-14: warning: %define variable 'parse.error' redefined [-Wother]
input.y:11.1-14: note: previous definition
fix-it:"input.y":{27:1-27:15}:""
input.y:29.1-18: warning: duplicate directive: '%name-prefix "bar"' [-Wother]
input.y:13.1-20: note: previous declaration
fix-it:"input.y":{29:1-29:19}:""
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_CHECK([cp errors-all experr])
AT_BISON_CHECK([[-ffixit input.y]], [], [], [experr])

AT_CHECK([[sed -e '/^fix-it:/d' errors-all >experr]])
AT_BISON_CHECK([[input.y]], [], [], [experr])


# Update the input file.  Make sure we generated nothing.
AT_CHECK([rm -f output.c])
AT_CHECK([cp input.y input.y.orig])
AT_CHECK([sed -e '/fix-it/d' <errors-all >experr])
AT_CHECK([echo "bison: file 'input.y' was updated (backup: 'input.y~')" >>experr])
AT_BISON_CHECK([[--update input.y]], [], [[]], [experr])

# Check the backup.
AT_CHECK([diff input.y.orig input.y~])

# Check we did not generate any file.
AT_CHECK([test ! -f output.c])

# Check the update.
AT_CHECK([sed -e '1,8d' input.y], [],
[[
%default-prec
%define parse.error verbose
%expect-rr 0
%file-prefix "foo"
	%output "y.tab.c"
        %output "y.tab.c"
%output "y.tab.c"
%define api.prefix {foo}
%no-default-prec
%no-default-prec
%no-lines
%output "output.c"
%define api.pure
%token-table
%glr-parser
%defines "header.h"
%%
exp : '0'
]])

AT_BISON_CHECK([[input.y]])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP


## ---------------------------- ##
## Unput's effect on locations. ##
## ---------------------------- ##

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

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

AT_KEYWORDS([[deprec]])

AT_BISON_OPTION_PUSHDEFS
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: %define variable 'parse.error' redefined [-Wother]
input.y:13.1-14: note: previous definition
input.y:14.16-29: warning: %define variable 'parse.error' redefined [-Wother]
input.y:13.16-29: note: previous definition
input.y: error: reduce/reduce conflicts: 0 found, 42 expected
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP


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

AT_SETUP([[Non-deprecated directives]])

AT_KEYWORDS([[deprec]])

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

AT_BISON_CHECK([[input.y]], [[0]], [[]],
[[input.y:14.1-15.5: warning: duplicate directive: '%file-prefix' [-Wother]
input.y:13.1-18: note: previous declaration
input.y: warning: %expect-rr applies only to GLR parsers [-Wother]
input.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
]])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP


## -------------------- ##
## Cannot type action.  ##
## -------------------- ##

AT_SETUP([[Cannot type action]])

AT_BISON_OPTION_PUSHDEFS
AT_DATA_GRAMMAR([[input.y]],
[[%%
exp: <int> {}
]])

AT_BISON_CHECK([[-fcaret input.y]], [[0]], [[]],
[[input.y:10.6-13: warning: only midrule actions can be typed: int [-Wother]
   10 | exp: <int> {}
      |      ^~~~~~~~
]])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP



## -------------------------------------- ##
## Character literals and api.token.raw.  ##
## -------------------------------------- ##

AT_SETUP([[Character literals and api.token.raw]])

AT_BISON_OPTION_PUSHDEFS
AT_DATA_GRAMMAR([[input.y]],
[[%define api.token.raw
%token 'a'
%%
exp: 'b' "c" {}
]])

AT_BISON_CHECK([[-fcaret input.y]], [[1]], [[]],
[[input.y:10.8-10: error: character literals cannot be used together with api.token.raw
   10 | %token 'a'
      |        ^~~
input.y:9.1-21: note: definition of api.token.raw
    9 | %define api.token.raw
      | ^~~~~~~~~~~~~~~~~~~~~
input.y:12.6-8: error: character literals cannot be used together with api.token.raw
   12 | exp: 'b' "c" {}
      |      ^~~
input.y:9.1-21: note: definition of api.token.raw
    9 | %define api.token.raw
      | ^~~~~~~~~~~~~~~~~~~~~
]])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP



## ------------------------------ ##
## %token-table and parse.error.  ##
## ------------------------------ ##

AT_SETUP([[%token-table and parse.error]])

# AT_TEST(DIRECTIVES, ERROR-LOCATION)
# -----------------------------------
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[[$1
%%
exp: %empty;
]])
AT_BISON_CHECK([[input.y]], [[1]], [[]],
[$2: error: '%token-table' and '%define parse.error (custom|detailed)' cannot be used together
])
])

AT_TEST([%define parse.error custom %token-table],  [[input.y:1.1-26]])
AT_TEST([%define parse.error detailed %token-table],[[input.y:1.1-28]])

m4_popdef([AT_TEST])

AT_CLEANUP

## --------------------------------------- ##
## Invalid file prefix mapping arguments.  ##
## --------------------------------------- ##

AT_SETUP([[Invalid file prefix mapping arguments]])

# AT_TEST(DIRECTIVES, OPTIONS, ERROR-LOCATION)
# --------------------------------------------
m4_pushdef([AT_TEST],
[AT_DATA([[input.y]],
[[
%%
exp: %empty;
]])
AT_BISON_CHECK([[$1 input.y]], [[1]], [[]],
[[$3: error: invalid argument for '--file-prefix-map': $2
]])
])

AT_TEST([-M foo], [foo], [<command line>:4])
AT_TEST([--file-prefix-map foo], [foo], [<command line>:4])
AT_TEST([-M foo=bar -M baz], [baz], [<command line>:6])
AT_TEST([-M foo= -M baz], [baz], [<command line>:6])

m4_popdef([AT_TEST])

AT_CLEANUP