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| Current File : //usr/share/bison/glr.cc |
-*- C -*-
# C++ GLR skeleton for Bison
# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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/>.
# This skeleton produces a C++ class that encapsulates a C glr parser.
# This is in order to reduce the maintenance burden. The glr.c
# skeleton is clean and pure enough so that there are no real
# problems. The C++ interface is the same as that of lalr1.cc. In
# fact, glr.c can replace yacc.c without the user noticing any
# difference, and similarly for glr.cc replacing lalr1.cc.
#
# The passing of parse-params
#
# The additional arguments are stored as members of the parser
# object, yyparser. The C routines need to carry yyparser
# throughout the C parser; that easy: just let yyparser become an
# additional parse-param. But because the C++ skeleton needs to
# know the "real" original parse-param, we save them
# (b4_parse_param_orig). Note that b4_parse_param is overquoted
# (and c.m4 strips one level of quotes). This is a PITA, and
# explains why there are so many levels of quotes.
#
# The locations
#
# We use location.cc just like lalr1.cc, but because glr.c stores
# the locations in a (C++) union, the position and location classes
# must not have a constructor. Therefore, contrary to lalr1.cc, we
# must not define "b4_location_constructors". As a consequence the
# user must initialize the first positions (in particular the
# filename member).
# We require a pure interface using locations.
m4_define([b4_locations_flag], [1])
m4_define([b4_pure_flag], [1])
# The header is mandatory.
b4_defines_if([],
[b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
m4_include(b4_pkgdatadir/[c++.m4])
m4_include(b4_pkgdatadir/[location.cc])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
# Save the parse parameters.
m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
# b4_yy_symbol_print_generate
# ---------------------------
# Bypass the default implementation to generate the "yy_symbol_print"
# and "yy_symbol_value_print" functions.
m4_define([b4_yy_symbol_print_generate],
[[
/*--------------------.
| Print this symbol. |
`--------------------*/
]b4_c_ansi_function_def([yy_symbol_print],
[static void],
[[FILE *], []],
[[int yytype], [yytype]],
[[const b4_namespace_ref::b4_parser_class_name::semantic_type *yyvaluep],
[yyvaluep]],
[[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp],
[yylocationp]],
b4_parse_param)[
{
]b4_parse_param_use[]dnl
[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
}
]])
# Declare yyerror.
m4_append([b4_post_prologue],
[b4_syncline([@oline@], [@ofile@])
b4_c_ansi_function_decl([yyerror],
[static void],
[[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
b4_parse_param,
[[const char* msg], [msg]])])
# Define yyerror.
m4_append([b4_epilogue],
[b4_syncline([@oline@], [@ofile@])[
/*------------------.
| Report an error. |
`------------------*/
]b4_c_ansi_function_def([yyerror],
[static void],
[[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
b4_parse_param,
[[const char* msg], [msg]])[
{
]b4_parse_param_use[]dnl
[ yyparser.error (*yylocationp, msg);
}
]b4_namespace_open[
]dnl In this section, the parse param are the original parse_params.
m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
[ /// Build a parser object.
]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
:])[
#if YYDEBUG
]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false),
yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
#endif]b4_parse_param_cons[
{
}
]b4_parser_class_name::~b4_parser_class_name[ ()
{
}
int
]b4_parser_class_name[::parse ()
{
return ::yyparse (*this]b4_user_args[);
}
#if YYDEBUG
/*--------------------.
| Print this symbol. |
`--------------------*/
inline void
]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
const semantic_type* yyvaluep, const location_type* yylocationp)
{
/* Pacify ``unused variable'' warnings. */
YYUSE (yyvaluep);
YYUSE (yylocationp);
switch (yytype)
{
]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
[ default:
break;
}
}
void
]b4_parser_class_name[::yy_symbol_print_ (int yytype,
const semantic_type* yyvaluep, const location_type* yylocationp)
{
*yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
<< ' ' << yytname[yytype] << " ("
<< *yylocationp << ": ";
yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
*yycdebug_ << ')';
}
std::ostream&
]b4_parser_class_name[::debug_stream () const
{
return *yycdebug_;
}
void
]b4_parser_class_name[::set_debug_stream (std::ostream& o)
{
yycdebug_ = &o;
}
]b4_parser_class_name[::debug_level_type
]b4_parser_class_name[::debug_level () const
{
return yydebug_;
}
void
]b4_parser_class_name[::set_debug_level (debug_level_type l)
{
yydebug_ = l;
}
#endif
]m4_popdef([b4_parse_param])dnl
b4_namespace_close[
]])
# Let glr.c believe that the user arguments include the parser itself.
m4_ifset([b4_parse_param],
[m4_pushdef([b4_parse_param],
m4_dquote([[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]],]
m4_defn([b4_parse_param])))],
[m4_pushdef([b4_parse_param],
[[[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]]]])
])
m4_include(b4_pkgdatadir/[glr.c])
m4_popdef([b4_parse_param])
m4_divert_push(0)
@output(b4_spec_defines_file@)
b4_copyright([Skeleton interface for Bison GLR parsers in C++],
[2002, 2003, 2004, 2005, 2006])[
/* C++ GLR parser skeleton written by Akim Demaille. */
#ifndef PARSER_HEADER_H
# define PARSER_HEADER_H
]b4_percent_code_get([[requires]])[
#include <string>
#include <iostream>
/* Using locations. */
#define YYLSP_NEEDED ]b4_locations_flag[
]b4_namespace_open[
class position;
class location;
]b4_namespace_close[
#include "location.hh"
/* Enabling traces. */
#ifndef YYDEBUG
# define YYDEBUG ]b4_debug_flag[
#endif
/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
If N is 0, then set CURRENT to the empty location which ends
the previous symbol: RHS[0] (always defined). */
#ifndef YYLLOC_DEFAULT
# define YYLLOC_DEFAULT(Current, Rhs, N) \
do \
if (N) \
{ \
(Current).begin = YYRHSLOC (Rhs, 1).begin; \
(Current).end = YYRHSLOC (Rhs, N).end; \
} \
else \
{ \
(Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \
} \
while (/*CONSTCOND*/ 0)
#endif
]b4_namespace_open[
/// A Bison parser.
class ]b4_parser_class_name[
{
public:
/// Symbol semantic values.
#ifndef YYSTYPE
]m4_ifdef([b4_stype],
[ union semantic_type
{
b4_user_stype
};],
[m4_if(b4_tag_seen_flag, 0,
[[ typedef int semantic_type;]],
[[ typedef YYSTYPE semantic_type;]])])[
#else
typedef YYSTYPE semantic_type;
#endif
/// Symbol locations.
typedef ]b4_percent_define_get([[location_type]])[ location_type;
/// Tokens.
struct token
{
]b4_token_enums(b4_tokens)[
};
/// Token type.
typedef token::yytokentype token_type;
/// Build a parser object.
]b4_parser_class_name[ (]b4_parse_param_decl[);
virtual ~]b4_parser_class_name[ ();
/// Parse.
/// \returns 0 iff parsing succeeded.
virtual int parse ();
/// The current debugging stream.
std::ostream& debug_stream () const;
/// Set the current debugging stream.
void set_debug_stream (std::ostream &);
/// Type for debugging levels.
typedef int debug_level_type;
/// The current debugging level.
debug_level_type debug_level () const;
/// Set the current debugging level.
void set_debug_level (debug_level_type l);
private:
public:
/// Report a syntax error.
/// \param loc where the syntax error is found.
/// \param msg a description of the syntax error.
virtual void error (const location_type& loc, const std::string& msg);
private:
#if YYDEBUG
public:
/// \brief Report a symbol value on the debug stream.
/// \param yytype The token type.
/// \param yyvaluep Its semantic value.
/// \param yylocationp Its location.
virtual void yy_symbol_value_print_ (int yytype,
const semantic_type* yyvaluep,
const location_type* yylocationp);
/// \brief Report a symbol on the debug stream.
/// \param yytype The token type.
/// \param yyvaluep Its semantic value.
/// \param yylocationp Its location.
virtual void yy_symbol_print_ (int yytype,
const semantic_type* yyvaluep,
const location_type* yylocationp);
private:
/* Debugging. */
int yydebug_;
std::ostream* yycdebug_;
#endif
/// \brief Reclaim the memory associated to a symbol.
/// \param yymsg Why this token is reclaimed.
/// \param yytype The symbol type.
/// \param yyvaluep Its semantic value.
/// \param yylocationp Its location.
inline void yydestruct_ (const char* yymsg,
int yytype,
semantic_type* yyvaluep,
location_type* yylocationp);
]b4_parse_param_vars[
};
]dnl Redirections for glr.c.
b4_percent_define_flag_if([[global_tokens_and_yystype]],
[b4_token_defines(b4_tokens)])
[
#ifndef YYSTYPE
# define YYSTYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
#endif
#ifndef YYLTYPE
# define YYLTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
#endif
]b4_namespace_close[
]b4_percent_code_get([[provides]])[]dnl
[#endif /* ! defined PARSER_HEADER_H */]
m4_divert_pop(0)