Dan Willemsen | 2212d17 | 2018-01-09 12:48:54 -0800 | [diff] [blame] | 1 | -*- Autoconf -*- |
| 2 | |
| 3 | # C++ skeleton for Bison |
| 4 | |
| 5 | # Copyright (C) 2002-2012 Free Software Foundation, Inc. |
| 6 | |
| 7 | # This program is free software: you can redistribute it and/or modify |
| 8 | # it under the terms of the GNU General Public License as published by |
| 9 | # the Free Software Foundation, either version 3 of the License, or |
| 10 | # (at your option) any later version. |
| 11 | # |
| 12 | # This program is distributed in the hope that it will be useful, |
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | # GNU General Public License for more details. |
| 16 | # |
| 17 | # You should have received a copy of the GNU General Public License |
| 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | |
| 20 | m4_include(b4_pkgdatadir/[c.m4]) |
| 21 | |
| 22 | ## ---------------- ## |
| 23 | ## Default values. ## |
| 24 | ## ---------------- ## |
| 25 | |
| 26 | # Default parser class name. |
| 27 | b4_percent_define_default([[parser_class_name]], [[parser]]) |
| 28 | |
| 29 | # Don't do that so that we remember whether we're using a user |
| 30 | # request, or the default value. |
| 31 | # |
| 32 | # b4_percent_define_default([[api.location.type]], [[location]]) |
| 33 | |
| 34 | b4_percent_define_default([[filename_type]], [[std::string]]) |
| 35 | b4_percent_define_default([[namespace]], m4_defn([b4_prefix])) |
| 36 | b4_percent_define_default([[global_tokens_and_yystype]], [[false]]) |
| 37 | b4_percent_define_default([[define_location_comparison]], |
| 38 | [m4_if(b4_percent_define_get([[filename_type]]), |
| 39 | [std::string], [[true]], [[false]])]) |
| 40 | |
| 41 | |
| 42 | ## ----------- ## |
| 43 | ## Namespace. ## |
| 44 | ## ----------- ## |
| 45 | |
| 46 | m4_define([b4_namespace_ref], [b4_percent_define_get([[namespace]])]) |
| 47 | |
| 48 | # Don't permit an empty b4_namespace_ref. Any `::parser::foo' appended to it |
| 49 | # would compile as an absolute reference with `parser' in the global namespace. |
| 50 | # b4_namespace_open would open an anonymous namespace and thus establish |
| 51 | # internal linkage. This would compile. However, it's cryptic, and internal |
| 52 | # linkage for the parser would be specified in all translation units that |
| 53 | # include the header, which is always generated. If we ever need to permit |
| 54 | # internal linkage somehow, surely we can find a cleaner approach. |
| 55 | m4_if(m4_bregexp(b4_namespace_ref, [^[ ]*$]), [-1], [], |
| 56 | [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| 57 | [[namespace reference is empty]])]) |
| 58 | |
| 59 | # Instead of assuming the C++ compiler will do it, Bison should reject any |
| 60 | # invalid b4_namepsace_ref that would be converted to a valid |
| 61 | # b4_namespace_open. The problem is that Bison doesn't always output |
| 62 | # b4_namespace_ref to uncommented code but should reserve the ability to do so |
| 63 | # in future releases without risking breaking any existing user grammars. |
| 64 | # Specifically, don't allow empty names as b4_namespace_open would just convert |
| 65 | # those into anonymous namespaces, and that might tempt some users. |
| 66 | m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*::]), [-1], [], |
| 67 | [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| 68 | [[namespace reference has consecutive "::"]])]) |
| 69 | m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*$]), [-1], [], |
| 70 | [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| 71 | [[namespace reference has a trailing "::"]])]) |
| 72 | |
| 73 | m4_define([b4_namespace_open], |
| 74 | [b4_user_code([b4_percent_define_get_syncline([[namespace]]) |
| 75 | [namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref), |
| 76 | [^\(.\)[ ]*::], [\1])), |
| 77 | [::], [ { namespace ])[ {]])]) |
| 78 | |
| 79 | m4_define([b4_namespace_close], |
| 80 | [b4_user_code([b4_percent_define_get_syncline([[namespace]]) |
| 81 | m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]), |
| 82 | [^\(.\)[ ]*\(::\)?\([^][:]\|:[^:]\)*], |
| 83 | [\1])), |
| 84 | [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])]) |
| 85 | |
| 86 | |
| 87 | # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER) |
| 88 | # ----------------------------------------------------- |
| 89 | # Output the definition of the tokens as enums. |
| 90 | m4_define([b4_token_enums], |
| 91 | [/* Tokens. */ |
| 92 | enum yytokentype { |
| 93 | m4_map_sep([ b4_token_enum], [, |
| 94 | ], |
| 95 | [$@]) |
| 96 | }; |
| 97 | ]) |
| 98 | |
| 99 | |
| 100 | |
| 101 | |
| 102 | ## ----------------- ## |
| 103 | ## Semantic Values. ## |
| 104 | ## ----------------- ## |
| 105 | |
| 106 | |
| 107 | # b4_lhs_value([TYPE]) |
| 108 | # -------------------- |
| 109 | # Expansion of $<TYPE>$. |
| 110 | m4_define([b4_lhs_value], |
| 111 | [(yyval[]m4_ifval([$1], [.$1]))]) |
| 112 | |
| 113 | |
| 114 | # b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) |
| 115 | # -------------------------------------- |
| 116 | # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH |
| 117 | # symbols on RHS. |
| 118 | m4_define([b4_rhs_value], |
| 119 | [(yysemantic_stack_@{($1) - ($2)@}m4_ifval([$3], [.$3]))]) |
| 120 | |
| 121 | # b4_lhs_location() |
| 122 | # ----------------- |
| 123 | # Expansion of @$. |
| 124 | m4_define([b4_lhs_location], |
| 125 | [(yyloc)]) |
| 126 | |
| 127 | |
| 128 | # b4_rhs_location(RULE-LENGTH, NUM) |
| 129 | # --------------------------------- |
| 130 | # Expansion of @NUM, where the current rule has RULE-LENGTH symbols |
| 131 | # on RHS. |
| 132 | m4_define([b4_rhs_location], |
| 133 | [(yylocation_stack_@{($1) - ($2)@})]) |
| 134 | |
| 135 | |
| 136 | # b4_parse_param_decl |
| 137 | # ------------------- |
| 138 | # Extra formal arguments of the constructor. |
| 139 | # Change the parameter names from "foo" into "foo_yyarg", so that |
| 140 | # there is no collision bw the user chosen attribute name, and the |
| 141 | # argument name in the constructor. |
| 142 | m4_define([b4_parse_param_decl], |
| 143 | [m4_ifset([b4_parse_param], |
| 144 | [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])]) |
| 145 | |
| 146 | m4_define([b4_parse_param_decl_1], |
| 147 | [$1_yyarg]) |
| 148 | |
| 149 | |
| 150 | |
| 151 | # b4_parse_param_cons |
| 152 | # ------------------- |
| 153 | # Extra initialisations of the constructor. |
| 154 | m4_define([b4_parse_param_cons], |
| 155 | [m4_ifset([b4_parse_param], |
| 156 | [ |
| 157 | b4_cc_constructor_calls(b4_parse_param)])]) |
| 158 | m4_define([b4_cc_constructor_calls], |
| 159 | [m4_map_sep([b4_cc_constructor_call], [, |
| 160 | ], [$@])]) |
| 161 | m4_define([b4_cc_constructor_call], |
| 162 | [$2 ($2_yyarg)]) |
| 163 | |
| 164 | # b4_parse_param_vars |
| 165 | # ------------------- |
| 166 | # Extra instance variables. |
| 167 | m4_define([b4_parse_param_vars], |
| 168 | [m4_ifset([b4_parse_param], |
| 169 | [ |
| 170 | /* User arguments. */ |
| 171 | b4_cc_var_decls(b4_parse_param)])]) |
| 172 | m4_define([b4_cc_var_decls], |
| 173 | [m4_map_sep([b4_cc_var_decl], [ |
| 174 | ], [$@])]) |
| 175 | m4_define([b4_cc_var_decl], |
| 176 | [ $1;]) |
| 177 | |
| 178 | |
| 179 | ## ---------## |
| 180 | ## Values. ## |
| 181 | ## ---------## |
| 182 | |
| 183 | # b4_yylloc_default_define |
| 184 | # ------------------------ |
| 185 | # Define YYLLOC_DEFAULT. |
| 186 | m4_define([b4_yylloc_default_define], |
| 187 | [[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N]. |
| 188 | If N is 0, then set CURRENT to the empty location which ends |
| 189 | the previous symbol: RHS[0] (always defined). */ |
| 190 | |
| 191 | # ifndef YYLLOC_DEFAULT |
| 192 | # define YYLLOC_DEFAULT(Current, Rhs, N) \ |
| 193 | do \ |
| 194 | if (N) \ |
| 195 | { \ |
| 196 | (Current).begin = YYRHSLOC (Rhs, 1).begin; \ |
| 197 | (Current).end = YYRHSLOC (Rhs, N).end; \ |
| 198 | } \ |
| 199 | else \ |
| 200 | { \ |
| 201 | (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \ |
| 202 | } \ |
| 203 | while (/*CONSTCOND*/ false) |
| 204 | # endif |
| 205 | ]]) |