| 1 | -*- C -*-
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| 2 |
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| 3 | # C++ GLR skeleton for Bison
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| 4 | # Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation,
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| 5 | # Inc.
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| 6 |
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| 7 | # This program is free software: you can redistribute it and/or modify
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| 8 | # it under the terms of the GNU General Public License as published by
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| 9 | # the Free Software Foundation, either version 3 of the License, or
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| 10 | # (at your option) any later version.
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| 11 | #
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| 12 | # This program is distributed in the hope that it will be useful,
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | # GNU General Public License for more details.
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| 16 | #
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| 17 | # You should have received a copy of the GNU General Public License
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| 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 19 |
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| 20 |
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| 21 | # This skeleton produces a C++ class that encapsulates a C glr parser.
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| 22 | # This is in order to reduce the maintenance burden. The glr.c
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| 23 | # skeleton is clean and pure enough so that there are no real
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| 24 | # problems. The C++ interface is the same as that of lalr1.cc. In
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| 25 | # fact, glr.c can replace yacc.c without the user noticing any
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| 26 | # difference, and similarly for glr.cc replacing lalr1.cc.
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| 27 | #
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| 28 | # The passing of parse-params
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| 29 | #
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| 30 | # The additional arguments are stored as members of the parser
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| 31 | # object, yyparser. The C routines need to carry yyparser
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| 32 | # throughout the C parser; that easy: just let yyparser become an
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| 33 | # additional parse-param. But because the C++ skeleton needs to
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| 34 | # know the "real" original parse-param, we save them
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| 35 | # (b4_parse_param_orig). Note that b4_parse_param is overquoted
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| 36 | # (and c.m4 strips one level of quotes). This is a PITA, and
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| 37 | # explains why there are so many levels of quotes.
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| 38 | #
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| 39 | # The locations
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| 40 | #
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| 41 | # We use location.cc just like lalr1.cc, but because glr.c stores
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| 42 | # the locations in a (C++) union, the position and location classes
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| 43 | # must not have a constructor. Therefore, contrary to lalr1.cc, we
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| 44 | # must not define "b4_location_constructors". As a consequence the
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| 45 | # user must initialize the first positions (in particular the
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| 46 | # filename member).
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| 47 |
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| 48 | # We require a pure interface using locations.
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| 49 | m4_define([b4_locations_flag], [1])
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| 50 | m4_define([b4_pure_flag], [1])
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| 51 |
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| 52 | # The header is mandatory.
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| 53 | b4_defines_if([],
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| 54 | [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
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| 55 |
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| 56 | m4_include(b4_pkgdatadir/[c++.m4])
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| 57 | m4_include(b4_pkgdatadir/[location.cc])
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| 58 |
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| 59 | m4_define([b4_parser_class_name],
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| 60 | [b4_percent_define_get([[parser_class_name]])])
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| 61 |
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| 62 | # Save the parse parameters.
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| 63 | m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
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| 64 |
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| 65 |
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| 66 | # b4_yy_symbol_print_generate
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| 67 | # ---------------------------
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| 68 | # Bypass the default implementation to generate the "yy_symbol_print"
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| 69 | # and "yy_symbol_value_print" functions.
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| 70 | m4_define([b4_yy_symbol_print_generate],
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| 71 | [[
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| 72 | /*--------------------.
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| 73 | | Print this symbol. |
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| 74 | `--------------------*/
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| 75 |
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| 76 | ]b4_c_ansi_function_def([yy_symbol_print],
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| 77 | [static void],
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| 78 | [[FILE *], []],
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| 79 | [[int yytype], [yytype]],
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| 80 | [[const b4_namespace_ref::b4_parser_class_name::semantic_type *yyvaluep],
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| 81 | [yyvaluep]],
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| 82 | [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp],
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| 83 | [yylocationp]],
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| 84 | b4_parse_param)[
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| 85 | {
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| 86 | ]b4_parse_param_use[]dnl
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| 87 | [ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
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| 88 | }
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| 89 | ]])
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| 90 |
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| 91 |
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| 92 | # Declare yyerror.
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| 93 | m4_append([b4_post_prologue],
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| 94 | [b4_syncline([@oline@], [@ofile@])
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| 95 |
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| 96 | b4_c_ansi_function_decl([yyerror],
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| 97 | [static void],
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| 98 | [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
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| 99 | b4_parse_param,
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| 100 | [[const char* msg], [msg]])])
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| 101 |
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| 102 |
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| 103 | # Define yyerror.
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| 104 | m4_append([b4_epilogue],
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| 105 | [b4_syncline([@oline@], [@ofile@])[
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| 106 | /*------------------.
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| 107 | | Report an error. |
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| 108 | `------------------*/
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| 109 |
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| 110 | ]b4_c_ansi_function_def([yyerror],
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| 111 | [static void],
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| 112 | [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]],
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| 113 | b4_parse_param,
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| 114 | [[const char* msg], [msg]])[
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| 115 | {
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| 116 | ]b4_parse_param_use[]dnl
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| 117 | [ yyparser.error (*yylocationp, msg);
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| 118 | }
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| 119 |
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| 120 |
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| 121 | ]b4_namespace_open[
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| 122 | ]dnl In this section, the parse param are the original parse_params.
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| 123 | m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
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| 124 | [ /// Build a parser object.
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| 125 | ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
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| 126 | :])[
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| 127 | #if YYDEBUG
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| 128 | ]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false),
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| 129 | yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
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| 130 | #endif]b4_parse_param_cons[
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| 131 | {
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| 132 | }
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| 133 |
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| 134 | ]b4_parser_class_name::~b4_parser_class_name[ ()
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| 135 | {
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| 136 | }
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| 137 |
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| 138 | int
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| 139 | ]b4_parser_class_name[::parse ()
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| 140 | {
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| 141 | return ::yyparse (*this]b4_user_args[);
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| 142 | }
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| 143 |
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| 144 | #if YYDEBUG
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| 145 | /*--------------------.
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| 146 | | Print this symbol. |
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| 147 | `--------------------*/
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| 148 |
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| 149 | inline void
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| 150 | ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
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| 151 | const semantic_type* yyvaluep, const location_type* yylocationp)
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| 152 | {
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| 153 | /* Pacify ``unused variable'' warnings. */
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| 154 | YYUSE (yyvaluep);
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| 155 | YYUSE (yylocationp);
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| 156 | switch (yytype)
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| 157 | {
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| 158 | ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
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| 159 | [ default:
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| 160 | break;
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| 161 | }
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| 162 | }
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| 163 |
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| 164 |
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| 165 | void
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| 166 | ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
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| 167 | const semantic_type* yyvaluep, const location_type* yylocationp)
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| 168 | {
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| 169 | *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
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| 170 | << ' ' << yytname[yytype] << " ("
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| 171 | << *yylocationp << ": ";
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| 172 | yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
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| 173 | *yycdebug_ << ')';
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| 174 | }
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| 175 |
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| 176 | std::ostream&
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| 177 | ]b4_parser_class_name[::debug_stream () const
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| 178 | {
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| 179 | return *yycdebug_;
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| 180 | }
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| 181 |
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| 182 | void
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| 183 | ]b4_parser_class_name[::set_debug_stream (std::ostream& o)
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| 184 | {
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| 185 | yycdebug_ = &o;
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| 186 | }
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| 187 |
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| 188 |
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| 189 | ]b4_parser_class_name[::debug_level_type
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| 190 | ]b4_parser_class_name[::debug_level () const
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| 191 | {
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| 192 | return yydebug_;
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| 193 | }
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| 194 |
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| 195 | void
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| 196 | ]b4_parser_class_name[::set_debug_level (debug_level_type l)
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| 197 | {
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| 198 | yydebug_ = l;
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| 199 | }
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| 200 |
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| 201 | #endif
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| 202 | ]m4_popdef([b4_parse_param])dnl
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| 203 | b4_namespace_close[
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| 204 |
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| 205 | ]])
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| 206 |
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| 207 |
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| 208 | # Let glr.c believe that the user arguments include the parser itself.
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| 209 | m4_ifset([b4_parse_param],
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| 210 | [m4_pushdef([b4_parse_param],
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| 211 | m4_dquote([[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]],]
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| 212 | m4_defn([b4_parse_param])))],
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| 213 | [m4_pushdef([b4_parse_param],
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| 214 | [[[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]]]])
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| 215 | ])
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| 216 | m4_include(b4_pkgdatadir/[glr.c])
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| 217 | m4_popdef([b4_parse_param])
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| 218 |
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| 219 | m4_divert_push(0)
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| 220 | @output(b4_spec_defines_file@)
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| 221 | b4_copyright([Skeleton interface for Bison GLR parsers in C++],
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| 222 | [2002, 2003, 2004, 2005, 2006])[
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| 223 |
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| 224 | /* C++ GLR parser skeleton written by Akim Demaille. */
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| 225 |
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| 226 | #ifndef PARSER_HEADER_H
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| 227 | # define PARSER_HEADER_H
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| 228 |
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| 229 | ]b4_percent_code_get([[requires]])[
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| 230 |
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| 231 | #include <string>
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| 232 | #include <iostream>
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| 233 |
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| 234 | /* Using locations. */
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| 235 | #define YYLSP_NEEDED ]b4_locations_flag[
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| 236 |
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| 237 | ]b4_namespace_open[
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| 238 | class position;
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| 239 | class location;
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| 240 | ]b4_namespace_close[
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| 241 |
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| 242 | #include "location.hh"
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| 243 |
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| 244 | /* Enabling traces. */
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| 245 | #ifndef YYDEBUG
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| 246 | # define YYDEBUG ]b4_debug_flag[
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| 247 | #endif
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| 248 |
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| 249 | /* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
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| 250 | If N is 0, then set CURRENT to the empty location which ends
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| 251 | the previous symbol: RHS[0] (always defined). */
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| 252 |
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| 253 | #ifndef YYLLOC_DEFAULT
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| 254 | # define YYLLOC_DEFAULT(Current, Rhs, N) \
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| 255 | do \
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| 256 | if (N) \
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| 257 | { \
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| 258 | (Current).begin = YYRHSLOC (Rhs, 1).begin; \
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| 259 | (Current).end = YYRHSLOC (Rhs, N).end; \
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| 260 | } \
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| 261 | else \
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| 262 | { \
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| 263 | (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \
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| 264 | } \
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| 265 | while (/*CONSTCOND*/ 0)
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| 266 | #endif
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| 267 |
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| 268 | ]b4_namespace_open[
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| 269 | /// A Bison parser.
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| 270 | class ]b4_parser_class_name[
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| 271 | {
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| 272 | public:
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| 273 | /// Symbol semantic values.
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| 274 | #ifndef YYSTYPE
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| 275 | ]m4_ifdef([b4_stype],
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| 276 | [ union semantic_type
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| 277 | {
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| 278 | b4_user_stype
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| 279 | };],
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| 280 | [m4_if(b4_tag_seen_flag, 0,
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| 281 | [[ typedef int semantic_type;]],
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| 282 | [[ typedef YYSTYPE semantic_type;]])])[
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| 283 | #else
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| 284 | typedef YYSTYPE semantic_type;
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| 285 | #endif
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| 286 | /// Symbol locations.
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| 287 | typedef ]b4_percent_define_get([[location_type]])[ location_type;
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| 288 | /// Tokens.
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| 289 | struct token
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| 290 | {
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| 291 | ]b4_token_enums(b4_tokens)[
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| 292 | };
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| 293 | /// Token type.
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| 294 | typedef token::yytokentype token_type;
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| 295 |
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| 296 | /// Build a parser object.
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| 297 | ]b4_parser_class_name[ (]b4_parse_param_decl[);
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| 298 | virtual ~]b4_parser_class_name[ ();
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| 299 |
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| 300 | /// Parse.
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| 301 | /// \returns 0 iff parsing succeeded.
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| 302 | virtual int parse ();
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| 303 |
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| 304 | /// The current debugging stream.
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| 305 | std::ostream& debug_stream () const;
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| 306 | /// Set the current debugging stream.
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| 307 | void set_debug_stream (std::ostream &);
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| 308 |
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| 309 | /// Type for debugging levels.
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| 310 | typedef int debug_level_type;
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| 311 | /// The current debugging level.
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| 312 | debug_level_type debug_level () const;
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| 313 | /// Set the current debugging level.
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| 314 | void set_debug_level (debug_level_type l);
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| 315 |
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| 316 | private:
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| 317 |
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| 318 | public:
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| 319 | /// Report a syntax error.
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| 320 | /// \param loc where the syntax error is found.
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| 321 | /// \param msg a description of the syntax error.
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| 322 | virtual void error (const location_type& loc, const std::string& msg);
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| 323 | private:
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| 324 |
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| 325 | #if YYDEBUG
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| 326 | public:
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| 327 | /// \brief Report a symbol value on the debug stream.
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| 328 | /// \param yytype The token type.
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| 329 | /// \param yyvaluep Its semantic value.
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| 330 | /// \param yylocationp Its location.
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| 331 | virtual void yy_symbol_value_print_ (int yytype,
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| 332 | const semantic_type* yyvaluep,
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| 333 | const location_type* yylocationp);
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| 334 | /// \brief Report a symbol on the debug stream.
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| 335 | /// \param yytype The token type.
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| 336 | /// \param yyvaluep Its semantic value.
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| 337 | /// \param yylocationp Its location.
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| 338 | virtual void yy_symbol_print_ (int yytype,
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| 339 | const semantic_type* yyvaluep,
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| 340 | const location_type* yylocationp);
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| 341 | private:
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| 342 | /* Debugging. */
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| 343 | int yydebug_;
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| 344 | std::ostream* yycdebug_;
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| 345 | #endif
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| 346 |
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| 347 |
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| 348 | /// \brief Reclaim the memory associated to a symbol.
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| 349 | /// \param yymsg Why this token is reclaimed.
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| 350 | /// \param yytype The symbol type.
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| 351 | /// \param yyvaluep Its semantic value.
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| 352 | /// \param yylocationp Its location.
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| 353 | inline void yydestruct_ (const char* yymsg,
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| 354 | int yytype,
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| 355 | semantic_type* yyvaluep,
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| 356 | location_type* yylocationp);
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| 357 |
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| 358 | ]b4_parse_param_vars[
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| 359 | };
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| 360 |
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| 361 | ]dnl Redirections for glr.c.
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| 362 | b4_percent_define_flag_if([[global_tokens_and_yystype]],
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| 363 | [b4_token_defines(b4_tokens)])
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| 364 | [
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| 365 | #ifndef YYSTYPE
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| 366 | # define YYSTYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
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| 367 | #endif
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| 368 | #ifndef YYLTYPE
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| 369 | # define YYLTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
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| 370 | #endif
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| 371 |
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| 372 | ]b4_namespace_close[
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| 373 |
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| 374 | ]b4_percent_code_get([[provides]])[]dnl
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| 375 |
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| 376 | [#endif /* ! defined PARSER_HEADER_H */]
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| 377 | m4_divert_pop(0)
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