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- -*- 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)