-m4_divert(-1) -*- C -*-
-
# C++ GLR skeleton for Bison
-# Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
-# This program is free software; you can redistribute it and/or modify
+# Copyright (C) 2002-2012 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 2 of the License, or
+# 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, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301 USA
-
-# We require a pure interface using locations.
-m4_define([b4_location_flag], [1])
-m4_define([b4_pure], [1])
+# 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's easy: make yyparser 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 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.
+m4_define([b4_pure_flag], [1])
m4_include(b4_pkgdatadir/[c++.m4])
-m4_include(b4_pkgdatadir/[location.cc])
+b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+ [m4_include(b4_pkgdatadir/[location.cc])])])
+m4_define([b4_parser_class_name],
+ [b4_percent_define_get([[parser_class_name]])])
-# b4_yysymprint_generate(FUNCTION-DECLARATOR)
-# -------------------------------------------
-# Generate the "yysymprint" function, which declaration is issued using
-# FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
-# or "b4_c_function_def" for K&R.
-m4_define([b4_yysymprint_generate],
-[b4_c_ansi_function_decl([yyerror],
- [static void],
- [[yy::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
- b4_parse_param,
- [[const char* msg], [msg]])[
+# Save the parse parameters.
+m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
-/*--------------------------------.
-| Print this symbol on YYOUTPUT. |
-`--------------------------------*/
-]$1([yysymprint],
+# b4_yy_symbol_print_define
+# -------------------------
+# Bypass the default implementation to generate the "yy_symbol_print"
+# and "yy_symbol_value_print" functions.
+m4_define([b4_yy_symbol_print_define],
+[[
+/*--------------------.
+| Print this symbol. |
+`--------------------*/
+
+]b4_function_define([yy_symbol_print],
[static void],
- [[FILE *yyoutput], [yyoutput]],
- [[int yytype], [yytype]],
- [[const yy::b4_parser_class_name::semantic_type *yyvaluep],
- [yyvaluep]][]dnl
-b4_location_if([,
- [[const yy::b4_parser_class_name::location_type *yylocationp],
- [yylocationp]]])[]dnl
-m4_ifset([b4_parse_param], [, b4_parse_param]))[
+ [[FILE *], []],
+ [[int yytype], [yytype]],
+ [[const ]b4_namespace_ref::b4_parser_class_name[::semantic_type *yyvaluep],
+ [yyvaluep]][]dnl
+b4_locations_if([,
+ [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+ [yylocationp]]]),
+ b4_parse_param)[
{
- YYUSE (yyoutput);
]b4_parse_param_use[]dnl
-[
- yyparser.yysymprint_ (yytype, yyvaluep]b4_location_if([, yylocationp])[);
+[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
}
]])
-m4_prepend([b4_epilogue],
-[[
+
+# Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
+# and declaration of yyerror.
+m4_append([b4_post_prologue],
+[b4_syncline([@oline@], [@ofile@])[
+]b4_yylloc_default_define[
+#define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
+]b4_function_declare([yyerror],
+ [static void],b4_locations_if([
+ [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+ [yylocationp]],])
+ b4_parse_param,
+ [[const char* msg], [msg]])])
+
+
+# Hijack the epilogue to define implementations (yyerror, parser member
+# functions etc.).
+m4_append([b4_epilogue],
+[b4_syncline([@oline@], [@ofile@])[
/*------------------.
| Report an error. |
`------------------*/
-]b4_c_ansi_function_def([yyerror],
- [static void],
- [[yy::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
+]b4_function_define([yyerror],
+ [static void],b4_locations_if([
+ [[const ]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);
+[ yyparser.error (]b4_locations_if([[*yylocationp, ]])[msg);
}
-namespace yy
-{
-]dnl Restore the actual parser params.
-m4_popdef([b4_parse_param])dnl
-[
- /// Build a parser object.
- ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)
- : yycdebug_ (&std::cerr)]b4_parse_param_cons[
+]b4_namespace_open[
+]dnl In this section, the parse params 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 ]b4_api_PREFIX[DEBUG
+ ]m4_ifset([b4_parse_param], [ ], [ :])[yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
+#endif]b4_parse_param_cons[
{
}
return ::yyparse (*this]b4_user_args[);
}
-#if YYDEBUG
-
- /*--------------------------------.
- | Print this symbol on YYOUTPUT. |
- `--------------------------------*/
-
- void
- ]b4_parser_class_name[::yysymprint_ (int yytype,
- const semantic_type* yyvaluep, const location_type* yylocationp)
- {
- /* Pacify ``unused variable'' warnings. */
+#if ]b4_api_PREFIX[DEBUG
+ /*--------------------.
+ | Print this symbol. |
+ `--------------------*/
+
+ inline void
+ ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
+ const semantic_type* yyvaluep]b4_locations_if([[,
+ const location_type* yylocationp]])[)
+ {]b4_locations_if([[
+ YYUSE (yylocationp);]])[
YYUSE (yyvaluep);
- YYUSE (yylocationp);
- /* Backward compatibility, but should be removed eventually. */
- std::ostream& cdebug_ = *yycdebug_;
- YYUSE (cdebug_);
-
- *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
- << ' ' << yytname[yytype] << " ("
- << *yylocationp << ": ";
+ std::ostream& yyoutput = debug_stream ();
+ std::ostream& yyo = yyoutput;
+ YYUSE (yyo);
switch (yytype)
{
- ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
+]b4_symbol_foreach([b4_symbol_printer])dnl
[ default:
break;
}
+ }
+
+
+ void
+ ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
+ const semantic_type* yyvaluep]b4_locations_if([[,
+ const location_type* yylocationp]])[)
+ {
+ *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
+ << ' ' << yytname[yytype] << " ("]b4_locations_if([[
+ << *yylocationp << ": "]])[;
+ yy_symbol_value_print_ (yytype, yyvaluep]b4_locations_if([[, yylocationp]])[);
*yycdebug_ << ')';
}
]b4_parser_class_name[::debug_level_type
]b4_parser_class_name[::debug_level () const
{
- return ::yydebug;
+ return yydebug;
}
void
]b4_parser_class_name[::set_debug_level (debug_level_type l)
{
- ::yydebug = l;
+ // Actually, it is yydebug which is really used.
+ yydebug = l;
}
-#endif /* ! YYDEBUG */
-
-} // namespace yy
-
-]])
-
-# Let glr.c believe that the user arguments are only the parser itself.
-m4_pushdef([b4_parse_param],
- [[yy::b4_parser_class_name& yyparser, yyparser],]
- m4_defn([b4_parse_param]))
-m4_include(b4_pkgdatadir/[glr.c])
-@output @output_header_name@
-b4_copyright([C++ Skeleton parser for GLALR(1) parsing with Bison],
- [2002, 2003, 2004, 2005])[
-
-/* As a special exception, when this parser skeleton is copied by
- Bison into a Bison output file, you may use that output file
- without restriction. This special exception was added by the Free
- Software Foundation for C++ GLR parsers in version 2.2 of
- Bison. */
-
-/* C++ GLR parser skeleton written by Akim Demaille. */
-
-#ifndef PARSER_HEADER_H
-# define PARSER_HEADER_H
-
-#include <string>
-#include <iostream>
-
-/* Using locations. */
-#define YYLSP_NEEDED ]b4_locations_flag[
-
-namespace yy
-{
- class position;
- class location;
-}
-
-/* Copy the first part of user declarations. */
-]b4_pre_prologue[
-
-]/* Line __line__ of glr.cc. */
-b4_syncline([@oline@], [@ofile@])[
-
-#include "stack.hh"
-#include "location.hh"
-
-/* Enabling traces. */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug[
-#endif
-
-/* Enabling verbose error messages. */
-#ifdef YYERROR_VERBOSE
-# undef YYERROR_VERBOSE
-# define YYERROR_VERBOSE 1
-#else
-# define YYERROR_VERBOSE ]b4_error_verbose[
-#endif
-
-/* Enabling the token table. */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
#endif
+]m4_popdef([b4_parse_param])dnl
+b4_namespace_close
+])
+
+# b4_shared_declarations
+# ----------------------
+# Declaration that might either go into the header (if --defines)
+# or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[dnl In this section, the parse params are the original parse_params.
+m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
+b4_percent_code_get([[requires]])[
+
+#include <stdexcept>
+#include <string>
+#include <iostream>]b4_defines_if([
+b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+ [[#include "location.hh"]])])])[
-#if 0
-/* Copy the second part of user declarations. */
-]b4_post_prologue[
-
-]/* Line __line__ of glr.cc. */
+]b4_YYDEBUG_define[
-b4_syncline([@oline@], [@ofile@])[
-#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 (0)
-#endif
+]b4_namespace_open[
+]b4_defines_if([],
+[b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+ [b4_position_define
+b4_location_define])])])[
-namespace yy
-{
/// A Bison parser.
class ]b4_parser_class_name[
{
public:
- /// Symbol semantic values.
-#if ! defined (YYSTYPE)
-]m4_ifdef([b4_stype],
-[b4_syncline([b4_stype_line], [b4_file_name])
- union semantic_type b4_stype;
-/* Line __line__ of lalr1.cc. */
-b4_syncline([@oline@], [@ofile@])],
-[ typedef int semantic_type;])[
-#else
- typedef YYSTYPE semantic_type;
-#endif
- /// Symbol locations.
- typedef ]b4_location_type[ location_type;
- /// Tokens.
- struct token
- {
- ]b4_token_enums(b4_tokens)[
- };
+]b4_public_types_declare[
/// Build a parser object.
]b4_parser_class_name[ (]b4_parse_param_decl[);
/// 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.
+ /// Report a syntax error.]b4_locations_if([[
+ /// \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:
+ virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
-#if YYDEBUG
+# if ]b4_api_PREFIX[DEBUG
public:
+ /// \brief Report a symbol value on the debug stream.
+ /// \param yytype The token type.
+ /// \param yyvaluep Its semantic value.]b4_locations_if([[
+ /// \param yylocationp Its location.]])[
+ virtual void yy_symbol_value_print_ (int yytype,
+ const semantic_type* yyvaluep]b4_locations_if([[,
+ 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 yysymprint_ (int yytype,
- const semantic_type* yyvaluep,
- const location_type* yylocationp);
+ /// \param yyvaluep Its semantic value.]b4_locations_if([[
+ /// \param yylocationp Its location.]])[
+ virtual void yy_symbol_print_ (int yytype,
+ const semantic_type* yyvaluep]b4_locations_if([[,
+ const location_type* yylocationp]])[);
private:
-#endif /* ! YYDEBUG */
-
-
- /// \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);
-
/* Debugging. */
std::ostream* yycdebug_;
+#endif
+
]b4_parse_param_vars[
};
]dnl Redirections for glr.c.
-[#define YYSTYPE yy::]b4_parser_class_name[::semantic_type
-#define YYLTYPE yy::]b4_parser_class_name[::location_type
+b4_percent_define_flag_if([[global_tokens_and_yystype]],
+[b4_token_defines])
+[
+#ifndef ]b4_api_PREFIX[STYPE
+# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
+#endif
+#ifndef ]b4_api_PREFIX[LTYPE
+# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
+#endif
-}
+]b4_namespace_close[
+]b4_percent_code_get([[provides]])[
+]m4_popdef([b4_parse_param])dnl
+])
-#endif /* ! defined PARSER_HEADER_H */]
+b4_defines_if(
+[m4_changecom()dnl
+m4_divert_push(0)dnl
+@output(b4_spec_defines_file@)@
+b4_copyright([Skeleton interface for Bison GLR parsers in C++],
+ [2002-2012])[
+
+/* C++ GLR parser skeleton written by Akim Demaille. */
+
+]b4_cpp_guard_open([b4_spec_defines_file])[
+]b4_shared_declarations[
+]b4_cpp_guard_close([b4_spec_defines_file])[
+]m4_divert_pop(0)
+m4_changecom[#])])
+
+# Let glr.c (and b4_shared_declarations) believe that the user
+# arguments include the parser itself.
+m4_ifset([b4_parse_param],
+[m4_pushdef([b4_parse_param],
+ [[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])
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