m4_divert(-1) -*- C -*-
# C++ GLR skeleton for Bison
-# Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003, 2004, 2005, 2006 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
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
+
+# 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_location_flag], [1])
-m4_define([b4_pure], [1])
+m4_define([b4_locations_flag], [1])
+m4_define([b4_pure_flag], [1])
+
+# The header is mandatory.
+b4_defines_if([],
+ [m4_fatal(b4_skeleton[: using %defines is mandatory])])
m4_include(b4_pkgdatadir/[c++.m4])
m4_include(b4_pkgdatadir/[location.cc])
+# 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],
-[b4_c_ansi_function_decl([yyerror],
- [static void],
- [[yy::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
- b4_parse_param,
- [[const char* msg], [msg]])[
-
+[[
/*--------------------.
| Print this symbol. |
`--------------------*/
[static void],
[[FILE *], []],
[[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]))[
+ [[const b4_namespace::b4_parser_class_name::semantic_type *yyvaluep],
+ [yyvaluep]],
+ [[const b4_namespace::b4_parser_class_name::location_type *yylocationp],
+ [yylocationp]],
+ b4_parse_param)[
{
]b4_parse_param_use[]dnl
-[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_location_if([, yylocationp])[);
+[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
}
]])
-m4_prepend([b4_epilogue],
-[[
+
+# Declare yyerror.
+m4_append([b4_post_prologue],
+[b4_syncline([@oline@], [@ofile@])
+
+b4_c_ansi_function_decl([yyerror],
+ [static void],
+ [[b4_namespace::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],
- [[yy::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
+ [[b4_namespace::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
b4_parse_param,
[[const char* msg], [msg]])[
{
}
-namespace yy
+namespace ]b4_namespace[
{
-]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[
+]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[
{
}
inline void
]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
- const semantic_type* yyvaluep, const location_type* yylocationp)
+ const semantic_type* yyvaluep, const location_type* yylocationp)
{
/* Pacify ``unused variable'' warnings. */
YYUSE (yyvaluep);
{
]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
[ default:
- break;
+ break;
}
}
void
]b4_parser_class_name[::yy_symbol_print_ (int yytype,
- const semantic_type* yyvaluep, const location_type* yylocationp)
+ const semantic_type* yyvaluep, const location_type* yylocationp)
{
*yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
- << ' ' << yytname[yytype] << " ("
- << *yylocationp << ": ";
+ << ' ' << yytname[yytype] << " ("
+ << *yylocationp << ": ";
yy_symbol_value_print_ (yytype, yyvaluep, 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;
+ yydebug_ = l;
}
-#endif /* ! YYDEBUG */
-
-} // namespace yy
+#endif
+]m4_popdef([b4_parse_param])dnl
+[} // namespace ]b4_namespace[
]])
-# 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]))
+
+# 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::b4_parser_class_name& yyparser], [[yyparser]]],]
+m4_defn([b4_parse_param])))],
+[m4_pushdef([b4_parse_param],
+ [[[[b4_namespace::b4_parser_class_name& yyparser], [[yyparser]]]]])
+])
m4_include(b4_pkgdatadir/[glr.c])
+m4_popdef([b4_parse_param])
+
@output @output_header_name@
-b4_copyright([C++ Skeleton parser for GLALR(1) parsing with Bison],
- [2002, 2003, 2004, 2005])[
+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
+]m4_ifdef([b4_requires],
+[[/* Copy the %requires blocks. */
+]b4_user_requires])[
+
#include <string>
#include <iostream>
/* Using locations. */
#define YYLSP_NEEDED ]b4_locations_flag[
-namespace yy
+namespace ]b4_namespace[
{
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
-
-#if 0
-/* Copy the second part of user declarations. */
-]b4_post_prologue[
-
-]/* Line __line__ of glr.cc. */
-
-b4_syncline([@oline@], [@ofile@])[
+# define YYDEBUG ]b4_debug_flag[
#endif
/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
while (/*CONSTCOND*/ 0)
#endif
-namespace yy
+namespace ]b4_namespace[
{
/// A Bison parser.
class ]b4_parser_class_name[
{
public:
/// Symbol semantic values.
-#if ! defined (YYSTYPE)
+#ifndef 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;])[
+[ 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
{
]b4_token_enums(b4_tokens)[
};
+ /// Token type.
+ typedef token::yytokentype token_type;
/// Build a parser object.
]b4_parser_class_name[ (]b4_parse_param_decl[);
/// \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);
+ 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);
+ const semantic_type* yyvaluep,
+ const location_type* yylocationp);
private:
-#endif /* ! YYDEBUG */
+ /* Debugging. */
+ int yydebug_;
+ std::ostream* yycdebug_;
+#endif
/// \brief Reclaim the memory associated to a symbol.
/// \param yyvaluep Its semantic value.
/// \param yylocationp Its location.
inline void yydestruct_ (const char* yymsg,
- int yytype,
- semantic_type* yyvaluep,
- location_type* yylocationp);
+ int yytype,
+ semantic_type* yyvaluep,
+ location_type* yylocationp);
- /* Debugging. */
- std::ostream* yycdebug_;
]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
+m4_ifset([b4_global_tokens_and_yystype],
+[b4_token_defines(b4_tokens)])
+[
+#ifndef YYSTYPE
+# define YYSTYPE ]b4_namespace[::]b4_parser_class_name[::semantic_type
+#endif
+#ifndef YYLTYPE
+# define YYLTYPE ]b4_namespace[::]b4_parser_class_name[::location_type
+#endif
}
-#endif /* ! defined PARSER_HEADER_H */]
+]m4_ifdef([b4_provides],
+[[/* Copy the %provides blocks. */
+]b4_user_provides])[]dnl
+
+[#endif /* ! defined PARSER_HEADER_H */]
projects / bison.git / blobdiff