# Simple calculator.                         -*- Autotest -*-

# Copyright (C) 2000-2012 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/>.

## ---------------------------------------------------- ##
## Compile the grammar described in the documentation.  ##
## ---------------------------------------------------- ##


# ------------------------- #
# Helping Autotest macros.  #
# ------------------------- #


# _AT_DATA_CALC_Y($1, $2, $3, [BISON-DIRECTIVES])
# -----------------------------------------------
# Produce `calc.y' and, if %defines was specified, `calc-lex.c' or
# `calc-lex.cc'.
#
# Don't call this macro directly, because it contains some occurrences
# of `$1' etc. which will be interpreted by m4.  So you should call it
# with $1, $2, and $3 as arguments, which is what AT_DATA_CALC_Y does.
#
# When %defines is not passed, generate a single self-contained file.
# Otherwise, generate three: calc.y with the parser, calc-lex.c with
# the scanner, and calc-main.c with "main()".  This is in order to
# stress the use of the generated parser header.  To avoid code
# duplication, AT_CALC_LEX and AT_CALC_MAIN contain the body of these
# two later files.
m4_define([_AT_DATA_CALC_Y],
[m4_if([$1$2$3], $[1]$[2]$[3], [],
       [m4_fatal([$0: Invalid arguments: $@])])dnl

m4_pushdef([AT_CALC_MAIN],
[#include <assert.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#else
# undef alarm
# define alarm(seconds) /* empty */
#endif

AT_SKEL_CC_IF([[
/* A C++ ]AT_NAME_PREFIX[parse that simulates the C signature.  */
int
]AT_NAME_PREFIX[parse (]AT_PARAM_IF([semantic_value *result, int *count]))[
{
  ]AT_NAME_PREFIX[::parser parser]AT_PARAM_IF([ (result, count)])[;
#if ]AT_API_PREFIX[DEBUG
  parser.set_debug_level (1);
#endif
  return parser.parse ();
}
]])[

semantic_value global_result = 0;
int global_count = 0;

/* A C main function.  */
int
main (int argc, const char **argv)
{
  semantic_value result = 0;
  int count = 0;
  int status;

  /* This used to be alarm (10), but that isn't enough time for
     a July 1995 vintage DEC Alphastation 200 4/100 system,
     according to Nelson H. F. Beebe.  100 seconds is enough.  */
  alarm (100);

  if (argc == 2)
    input = fopen (argv[1], "r");
  else
    input = stdin;

  if (!input)
    {
      perror (argv[1]);
      return 3;
    }

]AT_SKEL_CC_IF([], [m4_bmatch([$4], [%debug],
[  ]AT_NAME_PREFIX[debug = 1;])])[
  status = ]AT_NAME_PREFIX[parse (]AT_PARAM_IF([[&result, &count]])[);
  if (fclose (input))
    perror ("fclose");
  assert (global_result == result);
  assert (global_count == count);
  return status;
}
]])


m4_pushdef([AT_CALC_LEX],
[[#include <ctype.h>

]AT_YYLEX_DECLARE_EXTERN[
static int get_char (]AT_YYLEX_FORMALS[);
static void unget_char (]AT_YYLEX_PRE_FORMALS[ int c);

]AT_LOCATION_IF([
static AT_YYLTYPE last_yylloc;
])[
static int
get_char (]AT_YYLEX_FORMALS[)
{
  int res = getc (input);
  ]AT_USE_LEX_ARGS[;
]AT_LOCATION_IF([
  last_yylloc = AT_LOC;
  if (res == '\n')
    {
      AT_LOC_LAST_LINE++;
      AT_LOC_LAST_COLUMN = 1;
    }
  else
    AT_LOC_LAST_COLUMN++;
])[
  return res;
}

static void
unget_char (]AT_YYLEX_PRE_FORMALS[ int c)
{
  ]AT_USE_LEX_ARGS[;
]AT_LOCATION_IF([
  /* Wrong when C == `\n'. */
  AT_LOC = last_yylloc;
])[
  ungetc (c, input);
}

static int
read_signed_integer (]AT_YYLEX_FORMALS[)
{
  int c = get_char (]AT_YYLEX_ARGS[);
  int sign = 1;
  int n = 0;

  ]AT_USE_LEX_ARGS[;
  if (c == '-')
    {
      c = get_char (]AT_YYLEX_ARGS[);
      sign = -1;
    }

  while (isdigit (c))
    {
      n = 10 * n + (c - '0');
      c = get_char (]AT_YYLEX_ARGS[);
    }

  unget_char (]AT_YYLEX_PRE_ARGS[ c);

  return sign * n;
}


/*---------------------------------------------------------------.
| Lexical analyzer returns an integer on the stack and the token |
| NUM, or the ASCII character read if not a number.  Skips all   |
| blanks and tabs, returns 0 for EOF.                            |
`---------------------------------------------------------------*/

]AT_YYLEX_PROTOTYPE[
{
  int c;
  /* Skip current token, then white spaces.  */
  do
    {
]AT_LOCATION_IF(
[     AT_LOC_FIRST_COLUMN = AT_LOC_LAST_COLUMN;
      AT_LOC_FIRST_LINE   = AT_LOC_LAST_LINE;
])[
    }
  while ((c = get_char (]AT_YYLEX_ARGS[)) == ' ' || c == '\t');

  /* process numbers   */
  if (c == '.' || isdigit (c))
    {
      unget_char (]AT_YYLEX_PRE_ARGS[ c);
      ]AT_VAL[.ival = read_signed_integer (]AT_YYLEX_ARGS[);
      return NUM;
    }

  /* Return end-of-file.  */
  if (c == EOF)
    return CALC_EOF;

  /* Return single chars. */
  return c;
}
]])

AT_DATA_GRAMMAR([calc.y],
[[/* Infix notation calculator--calc */
]$4
AT_SKEL_CC_IF(
[%define global_tokens_and_yystype])[
%code requires
{
]AT_LOCATION_TYPE_IF([[
# include <iostream>
  struct Point
  {
    int l;
    int c;
  };

  struct Span
  {
    Point first;
    Point last;
  };

# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
  do                                                                    \
    if (N)                                                              \
      {                                                                 \
        (Current).first = YYRHSLOC (Rhs, 1).first;                      \
        (Current).last  = YYRHSLOC (Rhs, N).last;                       \
      }                                                                 \
    else                                                                \
      {                                                                 \
        (Current).first = (Current).last = YYRHSLOC (Rhs, 0).last;      \
      }                                                                 \
  while (false)

]])[
  /* Exercise pre-prologue dependency to %union.  */
  typedef int semantic_value;
}

/* Exercise %union. */
%union
{
  semantic_value ival;
};
%printer { ]AT_SKEL_CC_IF([[yyoutput << $$]],
                          [[fprintf (yyoutput, "%d", $$)]])[; } <ival>;

%code provides
{
  #include <stdio.h>
  /* The input.  */
  extern FILE *input;
  extern semantic_value global_result;
  extern int global_count;
}

%code
{
#include <assert.h>
#include <string.h>
#define USE(Var)

FILE *input;
static int power (int base, int exponent);

]AT_YYERROR_DECLARE[
]AT_YYLEX_DECLARE_EXTERN[
}

]AT_SKEL_CC_IF([AT_LOCATION_TYPE_IF([[
%initial-action
{
  @$.first.l = @$.first.c = 1;
  @$.last = @$.first;
}]])])[

/* Bison Declarations */
%token CALC_EOF 0 "end of input"
%token <ival> NUM "number"
%type  <ival> exp

%nonassoc '=' /* comparison            */
%left '-' '+'
%left '*' '/'
%left NEG     /* negation--unary minus */
%right '^'    /* exponentiation        */

/* Grammar follows */
%%
input:
  line
| input line         { ]AT_PARAM_IF([++*count; ++global_count;])[ }
;

line:
  '\n'
| exp '\n'           { ]AT_PARAM_IF([*result = global_result = $1], [USE ($1)])[; }
;

exp:
  NUM                { $$ = $1;             }
| exp '=' exp
  {
    if ($1 != $3)
      fprintf (stderr, "calc: error: %d != %d\n", $1, $3);
    $$ = $1;
  }
| exp '+' exp        { $$ = $1 + $3;        }
| exp '-' exp        { $$ = $1 - $3;        }
| exp '*' exp        { $$ = $1 * $3;        }
| exp '/' exp        { $$ = $1 / $3;        }
| '-' exp  %prec NEG { $$ = -$2;            }
| exp '^' exp        { $$ = power ($1, $3); }
| '(' exp ')'        { $$ = $2;             }
| '(' error ')'      { $$ = 1111; yyerrok;  }
| '!'                { $$ = 0; YYERROR;     }
| '-' error          { $$ = 0; YYERROR;     }
;
%%

static int
power (int base, int exponent)
{
  int res = 1;
  assert (0 <= exponent);
  for (/* Niente */; exponent; --exponent)
    res *= base;
  return res;
}

]AT_SKEL_CC_IF(
[AT_LOCATION_TYPE_IF([[
  std::ostream&
  operator<< (std::ostream& o, const Span& s)
  {
    o << s.first.l << '.' << s.first.c;
    if (s.first.l != s.last.l)
      o << '-' << s.last.l << '.' << s.last.c - 1;
    else if (s.first.c != s.last.c - 1)
      o << '-' << s.last.c - 1;
    return o;
  }
]])])[
]AT_YYERROR_DEFINE[
]AT_DEFINES_IF([],
[AT_CALC_LEX
AT_CALC_MAIN])])

AT_DEFINES_IF([AT_DATA_SOURCE([[calc-lex.c]AT_SKEL_CC_IF([[c]])],
[[#include "calc.h]AT_SKEL_CC_IF([[h]])["

]AT_CALC_LEX])
AT_DATA_SOURCE([[calc-main.c]AT_SKEL_CC_IF([[c]])],
[[#include "calc.h]AT_SKEL_CC_IF([[h]])["

]AT_CALC_MAIN])
])
m4_popdef([AT_CALC_MAIN])
m4_popdef([AT_CALC_LEX])
])# _AT_DATA_CALC_Y


# AT_DATA_CALC_Y([BISON-OPTIONS])
# -------------------------------
# Produce `calc.y' and, if %defines was specified, `calc-lex.c' or
# `calc-lex.cc'.
m4_define([AT_DATA_CALC_Y],
[_AT_DATA_CALC_Y($[1], $[2], $[3], [$1])
])


# _AT_CHECK_CALC(BISON-OPTIONS, INPUT, [NUM-STDERR-LINES])
# --------------------------------------------------------
# Run `calc' on INPUT and expect no STDOUT nor STDERR.
#
# If BISON-OPTIONS contains `%debug' but not `%glr-parser', then
#
# NUM-STDERR-LINES is the number of expected lines on stderr.
# Currently this is ignored, though, since the output format is fluctuating.
#
# We don't count GLR's traces yet, since its traces are somewhat
# different from LALR's.
m4_define([_AT_CHECK_CALC],
[AT_DATA([[input]],
[[$2
]])
AT_PARSER_CHECK([./calc input], 0, [], [stderr])
])


# _AT_CHECK_CALC_ERROR(BISON-OPTIONS, EXIT-STATUS, INPUT,
#                      [NUM-STDERR-LINES],
#                      [VERBOSE-AND-LOCATED-ERROR-MESSAGE])
# ---------------------------------------------------------
# Run `calc' on INPUT, and expect a `syntax error' message.
#
# If INPUT starts with a slash, it is used as absolute input file name,
# otherwise as contents.
#
# NUM-STDERR-LINES is the number of expected lines on stderr.
# Currently this is ignored, though, since the output format is fluctuating.
#
# If BISON-OPTIONS contains `%location', then make sure the ERROR-LOCATION
# is correctly output on stderr.
#
# If BISON-OPTIONS contains `%error-verbose', then make sure the
# IF-YYERROR-VERBOSE message is properly output after `syntax error, '
# on STDERR.
#
# If BISON-OPTIONS contains `%debug' but not `%glr', then NUM-STDERR-LINES
# is the number of expected lines on stderr.
m4_define([_AT_CHECK_CALC_ERROR],
[m4_bmatch([$3], [^/],
           [AT_PARSER_CHECK([./calc $3], $2, [], [stderr])],
           [AT_DATA([[input]],
[[$3
]])
AT_PARSER_CHECK([./calc input], $2, [], [stderr])])

# Normalize the observed and expected error messages, depending upon the
# options.
# 1. Remove the traces from observed.
sed '/^Starting/d
/^Entering/d
/^Stack/d
/^Reading/d
/^Reducing/d
/^Return/d
/^Shifting/d
/^state/d
/^Cleanup:/d
/^Error:/d
/^Next/d
/^Now/d
/^Discarding/d
/ \$[[0-9$]]* = /d
/^yydestructor:/d' stderr >at-stderr
mv at-stderr stderr
# 2. Create the reference error message.
AT_DATA([[expout]],
[$5
])
# 3. If locations are not used, remove them.
AT_YYERROR_SEES_LOC_IF([],
[[sed 's/^[-0-9.]*: //' expout >at-expout
mv at-expout expout]])
# 4. If error-verbose is not used, strip the`, unexpected....' part.
m4_bmatch([$1], [%error-verbose], [],
[[sed 's/syntax error, .*$/syntax error/' expout >at-expout
mv at-expout expout]])
# 5. Check
AT_CHECK([cat stderr], 0, [expout])
])


# AT_CHECK_SPACES([FILE])
# -----------------------
# Make sure we did not introduce bad spaces.  Checked here because all
# the skeletons are (or should be) exercized here.
m4_define([AT_CHECK_SPACES],
[AT_CHECK([$PERL -ne '
  chomp;
  print "$.: {$_}\n"
    if (# No starting/ending empty lines.
        (eof || $. == 1) && /^\s*$/
        # No trailing space.  FIXME: not ready for "maint".
        # || /\s$/
        )' $1
])dnl
])


# AT_CHECK_CALC([BISON-OPTIONS])
# ------------------------------
# Start a testing chunk which compiles `calc' grammar with
# BISON-OPTIONS, and performs several tests over the parser.
m4_define([AT_CHECK_CALC],
[m4_ifval([$2], [m4_fatal([$0: expected a single argument])])

# We use integers to avoid dependencies upon the precision of doubles.
AT_SETUP([Calculator $1])

AT_BISON_OPTION_PUSHDEFS([$1])

AT_DATA_CALC_Y([$1])
AT_FULL_COMPILE([calc], AT_DEFINES_IF([[lex], [main]]))
AT_CHECK_SPACES([calc.AT_SKEL_CC_IF([cc], [c])])
AT_DEFINES_IF([AT_CHECK_SPACES([calc.AT_SKEL_CC_IF([hh], [h])])])

# Test the priorities.
_AT_CHECK_CALC([$1],
[1 + 2 * 3 = 7
1 + 2 * -3 = -5

-1^2 = -1
(-1)^2 = 1

---1 = -1

1 - 2 - 3 = -4
1 - (2 - 3) = 2

2^2^3 = 256
(2^2)^3 = 64],
               [842])

# Some syntax errors.
_AT_CHECK_CALC_ERROR([$1], [1], [1 2], [15],
                     [1.3: syntax error, unexpected number])
_AT_CHECK_CALC_ERROR([$1], [1], [1//2], [20],
                     [1.3: syntax error, unexpected '/', expecting number or '-' or '(' or '!'])
_AT_CHECK_CALC_ERROR([$1], [1], [error], [5],
                     [1.1: syntax error, unexpected $undefined])
_AT_CHECK_CALC_ERROR([$1], [1], [1 = 2 = 3], [30],
                     [1.7: syntax error, unexpected '='])
_AT_CHECK_CALC_ERROR([$1], [1],
                     [
+1],
                     [20],
                     [2.1: syntax error, unexpected '+'])
# Exercise error messages with EOF: work on an empty file.
_AT_CHECK_CALC_ERROR([$1], [1], [/dev/null], [4],
                     [1.1: syntax error, unexpected end of input])

# Exercise the error token: without it, we die at the first error,
# hence be sure to
#
# - have several errors which exercise different shift/discardings
#   - (): nothing to pop, nothing to discard
#   - (1 + 1 + 1 +): a lot to pop, nothing to discard
#   - (* * *): nothing to pop, a lot to discard
#   - (1 + 2 * *): some to pop and discard
#
# - test the action associated to `error'
#
# - check the lookahead that triggers an error is not discarded
#   when we enter error recovery.  Below, the lookahead causing the
#   first error is ")", which is needed to recover from the error and
#   produce the "0" that triggers the "0 != 1" error.
#
_AT_CHECK_CALC_ERROR([$1], [0],
                     [() + (1 + 1 + 1 +) + (* * *) + (1 * 2 * *) = 1],
                     [250],
[1.2: syntax error, unexpected ')', expecting number or '-' or '(' or '!'
1.18: syntax error, unexpected ')', expecting number or '-' or '(' or '!'
1.23: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
1.41: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
calc: error: 4444 != 1])

# The same, but this time exercising explicitly triggered syntax errors.
# POSIX says the lookahead causing the error should not be discarded.
_AT_CHECK_CALC_ERROR([$1], [0], [(!) + (1 2) = 1], [102],
[1.10: syntax error, unexpected number
calc: error: 2222 != 1])
_AT_CHECK_CALC_ERROR([$1], [0], [(- *) + (1 2) = 1], [113],
[1.4: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
1.12: syntax error, unexpected number
calc: error: 2222 != 1])

# Check that yyerrok works properly: second error is not reported,
# third and fourth are.  Parse status is succesfull.
_AT_CHECK_CALC_ERROR([$1], [0], [(* *) + (*) + (*)], [113],
[1.2: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
1.10: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
1.16: syntax error, unexpected '*', expecting number or '-' or '(' or '!'])

AT_BISON_OPTION_POPDEFS

AT_CLEANUP
])# AT_CHECK_CALC


# ------------------------ #
# Simple LALR Calculator.  #
# ------------------------ #

AT_BANNER([[Simple LALR(1) Calculator.]])

# AT_CHECK_CALC_LALR([BISON-OPTIONS])
# -----------------------------------
# Start a testing chunk which compiles `calc' grammar with
# BISON-OPTIONS, and performs several tests over the parser.
m4_define([AT_CHECK_CALC_LALR],
[AT_CHECK_CALC($@)])

AT_CHECK_CALC_LALR()

AT_CHECK_CALC_LALR([%defines])
AT_CHECK_CALC_LALR([%locations])

AT_CHECK_CALC_LALR([%name-prefix="calc"]) dnl test deprecated `='
AT_CHECK_CALC_LALR([%verbose])
AT_CHECK_CALC_LALR([%yacc])
AT_CHECK_CALC_LALR([%error-verbose])

AT_CHECK_CALC_LALR([%define api.pure full %locations])
AT_CHECK_CALC_LALR([%define api.push-pull both %define api.pure full %locations])
AT_CHECK_CALC_LALR([%error-verbose %locations])

AT_CHECK_CALC_LALR([%error-verbose %locations %defines %name-prefix "calc" %verbose %yacc])
AT_CHECK_CALC_LALR([%error-verbose %locations %defines %define api.prefix "calc" %verbose %yacc])

AT_CHECK_CALC_LALR([%debug])
AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc])

AT_CHECK_CALC_LALR([%define api.pure full %verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
AT_CHECK_CALC_LALR([%define api.push-pull both %define api.pure full %verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc])

AT_CHECK_CALC_LALR([%define api.pure %error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])


# ----------------------- #
# Simple GLR Calculator.  #
# ----------------------- #

AT_BANNER([[Simple GLR Calculator.]])

# AT_CHECK_CALC_GLR([BISON-OPTIONS])
# ----------------------------------
# Start a testing chunk which compiles `calc' grammar with
# BISON-OPTIONS and %glr-parser, and performs several tests over the parser.
m4_define([AT_CHECK_CALC_GLR],
[AT_CHECK_CALC([%glr-parser] $@)])


AT_CHECK_CALC_GLR()

AT_CHECK_CALC_GLR([%defines])
AT_CHECK_CALC_GLR([%locations])
AT_CHECK_CALC_GLR([%name-prefix "calc"])
AT_CHECK_CALC_GLR([%define api.prefix "calc"])
AT_CHECK_CALC_GLR([%verbose])
AT_CHECK_CALC_GLR([%yacc])
AT_CHECK_CALC_GLR([%error-verbose])

AT_CHECK_CALC_GLR([%define api.pure %locations])
AT_CHECK_CALC_GLR([%error-verbose %locations])

AT_CHECK_CALC_GLR([%error-verbose %locations %defines %name-prefix "calc" %verbose %yacc])

AT_CHECK_CALC_GLR([%debug])
AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc])

AT_CHECK_CALC_GLR([%define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])

AT_CHECK_CALC_GLR([%define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
AT_CHECK_CALC_GLR([%define api.pure %error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])


# ----------------------------- #
# Simple LALR1 C++ Calculator.  #
# ----------------------------- #

AT_BANNER([[Simple LALR(1) C++ Calculator.]])

# First let's try using %skeleton
AT_CHECK_CALC([%skeleton "lalr1.cc" %defines %locations])

# AT_CHECK_CALC_LALR1_CC([BISON-OPTIONS])
# ---------------------------------------
# Start a testing chunk which compiles `calc' grammar with
# the C++ skeleton, and performs several tests over the parser.
m4_define([AT_CHECK_CALC_LALR1_CC],
[AT_CHECK_CALC([%language "C++" %defines %locations] $@)])

AT_CHECK_CALC_LALR1_CC([])
AT_CHECK_CALC_LALR1_CC([%define api.location.type Span])
AT_CHECK_CALC_LALR1_CC([%error-verbose %name-prefix "calc" %verbose %yacc])
AT_CHECK_CALC_LALR1_CC([%error-verbose %define api.prefix "calc" %verbose %yacc])
AT_CHECK_CALC_LALR1_CC([%error-verbose %debug %name-prefix "calc" %verbose %yacc])

AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %define api.prefix "calc" %verbose %yacc])

AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])


# --------------------------- #
# Simple GLR C++ Calculator.  #
# --------------------------- #

AT_BANNER([[Simple GLR C++ Calculator.]])

# Again, we try also using %skeleton.
AT_CHECK_CALC([%skeleton "glr.cc" %defines %locations])

# AT_CHECK_CALC_GLR_CC([BISON-OPTIONS])
# -------------------------------------
# Start a testing chunk which compiles `calc' grammar with
# the GLR C++ skeleton, and performs several tests over the parser.
m4_define([AT_CHECK_CALC_GLR_CC],
[AT_CHECK_CALC([%language "C++" %glr-parser %defines %locations] $@)])

AT_CHECK_CALC_GLR_CC([])
AT_CHECK_CALC_GLR_CC([%define api.location.type Span])
AT_CHECK_CALC_GLR_CC([%error-verbose %name-prefix "calc" %verbose %yacc])
AT_CHECK_CALC_GLR_CC([%error-verbose %define api.prefix "calc" %verbose %yacc])

AT_CHECK_CALC_GLR_CC([%debug])
AT_CHECK_CALC_GLR_CC([%error-verbose %debug %name-prefix "calc" %verbose %yacc])

AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc])

AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])