examples: simplify/improve

[bison.git] / tests / c++.at

# Checking the C++ Features.                    -*- Autotest -*-

# Copyright (C) 2004-2005, 2007-2012 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/>.

AT_BANNER([[C++ Features.]])


## ---------- ##
## Variants.  ##
## ---------- ##

# AT_CHECK_VARIANTS([DIRECTIVES])
# -------------------------------
# Check the support of variants in C++, with the additional DIRECTIVES.
m4_define([AT_CHECK_VARIANTS],
[AT_SETUP([Variants $1])

# Store strings and integers in a list of strings.
AT_DATA_GRAMMAR([list.yy],
[[%debug
%skeleton "lalr1.cc"
%defines
%define variant
%locations
]m4_bpatsubst([$1], [\\n], [
])[

%code requires // code for the .hh file
{
#include <list>
#include <string>
typedef std::list<std::string> strings_type;
}

%code // code for the .cc file
{
#include <iostream>
#include <sstream>

  static
#if defined USE_LEX_SYMBOL
  yy::parser::symbol_type yylex ();
#else
  yy::parser::token_type yylex (yy::parser::semantic_type* yylval,
                                yy::parser::location_type* yylloc);
#endif

  // Printing a list of strings (for %printer).
  // Koening look up will look into std, since that's an std::list.
  namespace std
  {
    std::ostream&
    operator<<(std::ostream& o, const strings_type& s)
    {
      o << '(';
      for (strings_type::const_iterator i = s.begin (); i != s.end (); ++i)
        {
          if (i != s.begin ())
            o << ", ";
          o << *i;
        }
      return o << ')';
    }
  }

  // Conversion to string.
  template <typename T>
    inline
    std::string
    string_cast (const T& t)
  {
    std::ostringstream o;
    o << t;
    return o.str ();
  }
}

%token <::std::string> TEXT;
%token <int> NUMBER;
%token END_OF_FILE 0;

%type <::std::string> item;
// Using the template type to exercize its parsing.
// Starting with :: to ensure we don't output "<::" which starts by the
// digraph for the left square bracket.
%type <::std::list<std::string>> list result;

%printer { yyo << $][$; }
  <int> <::std::string> <::std::list<std::string>>;
%%

result:
  list          { std::cout << $][1 << std::endl; }
;

list:
  /* nothing */ { /* Generates an empty string list */ }
| list item     { std::swap ($][$,$][1); $$.push_back ($][2); }
| list error    { std::swap ($][$,$][1); }
;

item:
  TEXT          { std::swap ($][$,$][1); }
| NUMBER        { if ($][1 == 3) YYERROR; else $][$ = string_cast ($][1); }
;
%%

#define STAGE_MAX 5
static
#if defined USE_LEX_SYMBOL
yy::parser::symbol_type yylex ()
#else
yy::parser::token_type yylex (yy::parser::semantic_type* yylval,
                              yy::parser::location_type* yylloc)
#endif
{
#ifndef USE_LEX_SYMBOL
  typedef yy::parser::token token;
#endif
  typedef yy::parser::location_type location_type;
  static int stage = -1;
  ++stage;
  if (stage == STAGE_MAX)
    {
#if defined USE_LEX_SYMBOL
      return yy::parser::make_END_OF_FILE (location_type ());
#else
      *yylloc = location_type ();
      return token::END_OF_FILE;
#endif
    }
  else if (stage % 2)
    {
#if defined USE_LEX_SYMBOL
      return yy::parser::make_NUMBER (stage, location_type ());
#else
# if defined ONE_STAGE_BUILD
      yylval->build (stage);
# else
      yylval->build<int>() = stage;
# endif
      *yylloc = location_type ();
      return token::NUMBER;
#endif
    }
  else
    {
#if defined USE_LEX_SYMBOL
      return yy::parser::make_TEXT (string_cast (stage), location_type ());
#else
# if defined ONE_STAGE_BUILD
      yylval->build (string_cast (stage));
# else
      yylval->build<std::string>() = string_cast (stage);
# endif
      *yylloc = location_type ();
      return token::TEXT;
#endif
    }
  abort ();
}

void
yy::parser::error (const yy::parser::location_type&,
                   const std::string& message)
{
  std::cerr << message << std::endl;
}

int
main ()
{
  yy::parser p;
  p.set_debug_level (!!getenv ("YYDEBUG"));
  return p.parse ();
}
]])

AT_BISON_CHECK([-o list.cc list.yy])
AT_COMPILE_CXX([list])
AT_CHECK([./list], 0,
         [(0, 1, 2, 4)
])

AT_CLEANUP
])

AT_CHECK_VARIANTS([])
AT_CHECK_VARIANTS([%define parse.assert])
AT_CHECK_VARIANTS([[%define parse.assert %code {\n#define ONE_STAGE_BUILD\n}]])
AT_CHECK_VARIANTS([[%define parse.assert %define lex_symbol %code {\n#define USE_LEX_SYMBOL\n}]])
AT_CHECK_VARIANTS([[%define parse.assert %define lex_symbol %code {\n#define USE_LEX_SYMBOL\n} %define api.token.prefix "TOK_"]])


## ----------------------- ##
## Doxygen Documentation.  ##
## ----------------------- ##

m4_define([AT_CHECK_DOXYGEN],
[m4_case([$1],
         [Public],  [m4_pushdef([AT_DOXYGEN_PRIVATE], [NO])],
         [Private], [m4_pushdef([AT_DOXYGEN_PRIVATE], [YES])],
         [m4_fatal([invalid argument: $1])])
AT_SETUP([Doxygen $1 Documentation])

AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
AT_DATA([input.yy],
[[%skeleton "lalr1.cc"
%locations
%debug
%defines
%%
exp:;
%%
]AT_YYERROR_DEFINE[
]])

AT_BISON_CHECK([-o input.cc input.yy], 0)

AT_DATA([Doxyfile],
[# The PROJECT_NAME tag is a single word (or a sequence of words
# surrounded by quotes) that should identify the project.
PROJECT_NAME = "Bison C++ Parser"

# The QUIET tag can be used to turn on/off the messages that are
# generated by doxygen. Possible values are YES and NO. If left blank
# NO is used.
QUIET = YES

# The WARNINGS tag can be used to turn on/off the warning messages
# that are generated by doxygen. Possible values are YES and NO. If
# left blank NO is used.
WARNINGS     = YES
# If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate
# warnings for undocumented members. If EXTRACT_ALL is set to YES then
# this flag will automatically be disabled.
WARN_IF_UNDOCUMENTED   = YES
# If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings
# for potential errors in the documentation, such as not documenting
# some parameters in a documented function, or documenting parameters
# that don't exist or using markup commands wrongly.
WARN_IF_DOC_ERROR      = YES
# The WARN_FORMAT tag determines the format of the warning messages
# that doxygen can produce. The string should contain the $file,
# $line, and $text tags, which will be replaced by the file and line
# number from which the warning originated and the warning text.
WARN_FORMAT            = "$file:$line: $text"

# If the EXTRACT_ALL tag is set to YES doxygen will assume all
# entities in documentation are documented, even if no documentation
# was available.  Private class members and static file members will
# be hidden unless the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set
# to YES
EXTRACT_ALL            = YES

# If the EXTRACT_PRIVATE tag is set to YES all private members of a
# class will be included in the documentation.
EXTRACT_PRIVATE        = AT_DOXYGEN_PRIVATE

# If the EXTRACT_STATIC tag is set to YES all static members of a file
# will be included in the documentation.
EXTRACT_STATIC         = AT_DOXYGEN_PRIVATE
])

AT_CHECK([doxygen --version || exit 77], 0, ignore)
AT_CHECK([doxygen], 0, [], [ignore])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP

m4_popdef([AT_DOXYGEN_PRIVATE])
])# AT_CHECK_DOXYGEN

AT_CHECK_DOXYGEN([Public])
AT_CHECK_DOXYGEN([Private])


## ------------ ##
## Namespaces.  ##
## ------------ ##

# AT_CHECK_NAMESPACE(NAMESPACE-DECL, [COMPILE-ERROR])
# ---------------------------------------------------
# See if Bison can handle %define namespace "NAMESPACE-DECL".  If COMPILE-ERROR
# is specified, then Bison should accept the input, but compilation will fail,
# so don't check compilation.
m4_define([AT_CHECK_NAMESPACE],
[

AT_DATA_GRAMMAR([[input.y]],
[[%language "C++"
%defines
%define api.namespace "]$1["
%union { int i; }
%define global_tokens_and_yystype
%locations

%code {
  // YYSTYPE contains a namespace reference.
  int yylex (YYSTYPE *lval, const ]$1[::parser::location_type*) {
    lval->i = 3;
    return 0;
  }
}

%%

start: ;

%%

void
]$1[::parser::error (const ]$1[::parser::location_type &loc,
                     const std::string &msg)
{
  std::cerr << "At " << loc << ": " << msg << std::endl;
}

int
main ()
{
  ]$1[::parser p;
  return p.parse ();
}
]])

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

m4_if([$#], [1],
[AT_COMPILE_CXX([[input]], [[input.cc]])
AT_PARSER_CHECK([[./input]])])

])

AT_SETUP([[Relative namespace references]])
AT_CHECK_NAMESPACE([[foo]])
AT_CHECK_NAMESPACE([[foo::bar]])
AT_CHECK_NAMESPACE([[foo::bar::baz]])
AT_CLEANUP

AT_SETUP([[Absolute namespace references]])
AT_CHECK_NAMESPACE([[::foo]])
AT_CHECK_NAMESPACE([[::foo::bar]])
AT_CHECK_NAMESPACE([[::foo::bar::baz]])
AT_CHECK_NAMESPACE([[	::foo]])
AT_CHECK_NAMESPACE([[  	 ::foo::bar]])
AT_CHECK_NAMESPACE([[  ::foo::bar::baz]])
AT_CLEANUP

AT_SETUP([[Syntactically invalid namespace references]])
AT_CHECK_NAMESPACE([[:foo:bar]], [[-]])
AT_CHECK_NAMESPACE([[foo: :bar]], [[-]])
# This one is interesting because `[3]' is encoded as `@<:@3@:>@', which
# contains single occurrences of `:'.
AT_CHECK_NAMESPACE([[foo[3]::bar::baz]], [[-]])
AT_CHECK_NAMESPACE([[foo::bar,baz]], [[-]])
AT_CHECK_NAMESPACE([[foo::bar::(baz /* Pacify Emacs ) */]], [[-]])
AT_CLEANUP


## -------------------------------------- ##
## Syntax error discarding no lookahead.  ##
## -------------------------------------- ##

# After a syntax error, lalr1.cc used to not check whether there
# actually is a lookahead before discarding the lookahead.  As a result,
# it mistakenly invoked the destructor for the previous lookahead.

AT_SETUP([[Syntax error discarding no lookahead]])

AT_DATA_GRAMMAR([[input.yy]],
[[%skeleton "lalr1.cc"

%code {
  #include <string>
  int yylex (yy::parser::semantic_type *);
  #define USE(Args)
}

%defines
%define parse.error verbose

%nonassoc 'a' ;

%destructor {
  std::cerr << "Discarding 'a'." << std::endl;
} 'a'

%%

start: error-reduce consistent-error 'a' { USE ($3); };

error-reduce:
  'a' 'a' consistent-error 'a' { USE (($1, $2, $4)); }
| 'a' error { std::cerr << "Reducing 'a'." << std::endl; USE ($1); }
;

consistent-error:
  'a'
| /*empty*/ %prec 'a'
;

// Provide another context in which all rules are useful so that this
// test case looks a little more realistic.
start: 'b' consistent-error ;

%%

int
yylex (yy::parser::semantic_type *)
{
  static char const *input = "aa";
  return *input++;
}

void
yy::parser::error (const std::string &m)
{
  std::cerr << m << std::endl;
}

int
main ()
{
  yy::parser parser;
  return parser.parse ();
}
]])
AT_BISON_CHECK([[-o input.cc input.yy]])
AT_COMPILE_CXX([[input]])
# This used to print "Discarding 'a'." again at the end.
AT_PARSER_CHECK([[./input]], [[1]], [[]],
[[syntax error
Discarding 'a'.
Reducing 'a'.
]])

AT_CLEANUP


## --------------------------- ##
## Syntax error as exception.  ##
## --------------------------- ##

AT_SETUP([[Syntax error as exception]])

AT_DATA_GRAMMAR([[input.yy]],
[[%skeleton "lalr1.cc"

%code
{
  #include <cstdlib>
  int yylex (yy::parser::semantic_type *);
}

%defines
%define variant
%define parse.error verbose
%define parse.trace
%%

start:
  thing
| start thing
;

thing:
  error   { std::cerr << "caught error" << std::endl; }
| item
;

item:
  'a'
| 's'
  {
    throw yy::parser::syntax_error ("invalid expression");
  }

%%

int
yylex (yy::parser::semantic_type *)
{
  // 's': syntax error, 'l': lexical error.
  static char const *input = "asal";
  switch (int res = *input++)
  {
    case 'l':
      throw yy::parser::syntax_error ("invalid character");
    default:
      return res;
  }
}

void
yy::parser::error (const std::string &m)
{
  std::cerr << "error: " << m << std::endl;
}

int
main ()
{
  yy::parser parser;
  parser.set_debug_level (!!getenv ("YYDEBUG"));
  return parser.parse ();
}
]])
AT_BISON_CHECK([[-o input.cc input.yy]])
AT_COMPILE_CXX([[input]])

AT_PARSER_CHECK([[./input]], [[0]], [[]],
[[error: invalid expression
caught error
error: invalid character
caught error
]])

AT_CLEANUP


## ------------------ ##
## Exception safety.  ##
## ------------------ ##

AT_SETUP([[Exception safety]])

AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])

AT_DATA_GRAMMAR([[input.yy]],
[[%skeleton "lalr1.cc"
%defines // FIXME: Mandated in 2.6.
%debug
%error-verbose

%code requires
{
  #include <cassert>
  #include <cstdlib> // size_t and getenv.
  #include <iostream>
  #include <list>

  bool debug = false;

  /// A class that counts its number of instances.
  struct Object
  {
    typedef std::list<const Object*> objects;
    static objects instances;
    char val;

    static bool
    empty ()
    {
      return instances.empty();
    }

    static void
    log (Object const *o, const std::string& msg)
    {
      if (debug)
        {
          if (o)
            std::cerr << o << "->";
          std::cerr << msg << " {";
          const char* sep = " ";
          for (objects::const_iterator i = instances.begin(),
                                       i_end = instances.end();
               i != i_end;
               ++i)
            {
              std::cerr << sep << *i;
              sep = ", ";
            }
          std::cerr << " }" << std::endl;
        }
    }

    Object (char v)
      : val (v)
    {
      instances.push_back(this);
      log (this, "Object::Object");
    }

    ~Object ()
    {
      instances.remove(this);
      log (this, "Object::~Object");
    }
  };
}

%code
{
  #include <cassert>
  #include <cstring> // strchr
  #include <stdexcept>
  int yylex (yy::parser::semantic_type *);
  Object::objects Object::instances;
  static char const *input;
}

%union
{
  Object *obj;
}

%initial-action
{
  if (strchr (input, 'i'))
    throw std::runtime_error ("initial-action");
}

%destructor { delete $$; } <obj>;
%printer
{
  yyo << $$ << " '" << $$->val << '\'';
  if ($$->val == 'p')
    throw std::runtime_error ("printer");
} <obj>;

%token <obj> 'a' 'E' 'e' 'p' 'R' 's' 'T'
%type  <obj> list item

%%

start: list { delete $1; };

list:
  item       { $$ = $1; }
| item list  { $$ = $1; delete $2; } // Right recursion to load the stack.
;

item:
  'a'  { $$ = $1; }
| 'e'  { YYUSE ($$); YYUSE($1); error ("syntax error"); }
// Not just 'E', otherwise we reduce when 'E' is the lookahead, and
// then the stack is emptied, defeating the point of the test.
| 'E' 'a' { YYUSE($1); $$ = $2; }
| 'R'  { $$ = YY_NULL; delete $1; YYERROR; }
| 'p'  { $$ = $1; }
| 's'  { $$ = $1; throw std::runtime_error ("reduction"); }
| 'T'  { $$ = YY_NULL; delete $1; YYABORT; }
| error { $$ = YY_NULL; yyerrok; }
;
%%

int
yylex (yy::parser::semantic_type *lvalp)
{
  // 'a': no error.
  // 'e': user action calls error.
  // 'E': syntax error, with yyerror that throws.
  // 'i': initial action throws.
  // 'l': yylex throws.
  // 'R': call YYERROR in the action
  // 's': reduction throws.
  // 'T': call YYABORT in the action
  switch (int res = *input++)
  {
    case 'l':
      throw std::runtime_error ("yylex");
    default:
      lvalp->obj = new Object (res);
      // Fall through.
    case 0:
      return res;
  }
}

/* A C++ error reporting function.  */
void
yy::parser::error (const std::string& m)
{
  throw std::runtime_error (m);
}

int
main (int argc, const char *argv[])
{
  switch (argc)
  {
    case 2:
      input = argv[1];
      break;
    case 3:
      assert (!strcmp (argv[1], "--debug"));
      debug = 1;
      input = argv[2];
      break;
    default:
      abort ();
  }

  yy::parser parser;
  debug |= !!getenv ("YYDEBUG");
  parser.set_debug_level (debug);
  int res = 2;
  try
  {
    res = parser.parse ();
  }
  catch (const std::exception& e)
  {
    std::cerr << "exception caught: " << e.what () << std::endl;
  }
  catch (...)
  {
    std::cerr << "unknown exception caught" << std::endl;
  }
  Object::log (YY_NULL, "end");
  assert (Object::empty());
  return res;
}
]])
AT_BISON_CHECK([[-o input.cc --report=all input.yy]])
AT_COMPILE_CXX([[input]])

AT_PARSER_CHECK([[./input aaaas]], [[2]], [[]],
[[exception caught: reduction
]])

AT_PARSER_CHECK([[./input aaaal]], [[2]], [[]],
[[exception caught: yylex
]])

AT_PARSER_CHECK([[./input i]], [[2]], [[]],
[[exception caught: initial-action
]])

AT_PARSER_CHECK([[./input aaaap]])

AT_PARSER_CHECK([[./input --debug aaaap]], [[2]], [[]], [[stderr]])
AT_PARSER_CHECK([[grep '^exception caught: printer$' stderr]], [], [ignore])

AT_PARSER_CHECK([[./input aaaae]], [[2]], [[]],
[[exception caught: syntax error
]])

AT_PARSER_CHECK([[./input aaaaE]], [[2]], [[]],
[[exception caught: syntax error, unexpected $end, expecting 'a'
]])

AT_PARSER_CHECK([[./input aaaaT]], [[1]])

# There is error-recovery, so exit success.
AT_PARSER_CHECK([[./input aaaaR]], [[0]])

AT_BISON_OPTION_POPDEFS

AT_CLEANUP