| -*- Autoconf -*- |
| |
| # C++ skeleton for Bison |
| |
| # 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 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/>. |
| |
| m4_include(b4_pkgdatadir/[c.m4]) |
| |
| ## ---------------- ## |
| ## Default values. ## |
| ## ---------------- ## |
| |
| # Default parser class name. |
| b4_percent_define_default([[parser_class_name]], [[parser]]) |
| |
| # Don't do that so that we remember whether we're using a user |
| # request, or the default value. |
| # |
| # b4_percent_define_default([[api.location.type]], [[location]]) |
| |
| b4_percent_define_default([[filename_type]], [[std::string]]) |
| b4_percent_define_default([[namespace]], m4_defn([b4_prefix])) |
| b4_percent_define_default([[global_tokens_and_yystype]], [[false]]) |
| b4_percent_define_default([[define_location_comparison]], |
| [m4_if(b4_percent_define_get([[filename_type]]), |
| [std::string], [[true]], [[false]])]) |
| |
| |
| ## ----------- ## |
| ## Namespace. ## |
| ## ----------- ## |
| |
| m4_define([b4_namespace_ref], [b4_percent_define_get([[namespace]])]) |
| |
| # Don't permit an empty b4_namespace_ref. Any `::parser::foo' appended to it |
| # would compile as an absolute reference with `parser' in the global namespace. |
| # b4_namespace_open would open an anonymous namespace and thus establish |
| # internal linkage. This would compile. However, it's cryptic, and internal |
| # linkage for the parser would be specified in all translation units that |
| # include the header, which is always generated. If we ever need to permit |
| # internal linkage somehow, surely we can find a cleaner approach. |
| m4_if(m4_bregexp(b4_namespace_ref, [^[ ]*$]), [-1], [], |
| [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| [[namespace reference is empty]])]) |
| |
| # Instead of assuming the C++ compiler will do it, Bison should reject any |
| # invalid b4_namepsace_ref that would be converted to a valid |
| # b4_namespace_open. The problem is that Bison doesn't always output |
| # b4_namespace_ref to uncommented code but should reserve the ability to do so |
| # in future releases without risking breaking any existing user grammars. |
| # Specifically, don't allow empty names as b4_namespace_open would just convert |
| # those into anonymous namespaces, and that might tempt some users. |
| m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*::]), [-1], [], |
| [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| [[namespace reference has consecutive "::"]])]) |
| m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*$]), [-1], [], |
| [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| [[namespace reference has a trailing "::"]])]) |
| |
| m4_define([b4_namespace_open], |
| [b4_user_code([b4_percent_define_get_syncline([[namespace]]) |
| [namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref), |
| [^\(.\)[ ]*::], [\1])), |
| [::], [ { namespace ])[ {]])]) |
| |
| m4_define([b4_namespace_close], |
| [b4_user_code([b4_percent_define_get_syncline([[namespace]]) |
| m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]), |
| [^\(.\)[ ]*\(::\)?\([^][:]\|:[^:]\)*], |
| [\1])), |
| [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])]) |
| |
| |
| # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER) |
| # ----------------------------------------------------- |
| # Output the definition of the tokens as enums. |
| m4_define([b4_token_enums], |
| [/* Tokens. */ |
| enum yytokentype { |
| m4_map_sep([ b4_token_enum], [, |
| ], |
| [$@]) |
| }; |
| ]) |
| |
| |
| |
| |
| ## ----------------- ## |
| ## Semantic Values. ## |
| ## ----------------- ## |
| |
| |
| # b4_lhs_value([TYPE]) |
| # -------------------- |
| # Expansion of $<TYPE>$. |
| m4_define([b4_lhs_value], |
| [(yyval[]m4_ifval([$1], [.$1]))]) |
| |
| |
| # b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) |
| # -------------------------------------- |
| # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH |
| # symbols on RHS. |
| m4_define([b4_rhs_value], |
| [(yysemantic_stack_@{($1) - ($2)@}m4_ifval([$3], [.$3]))]) |
| |
| # b4_lhs_location() |
| # ----------------- |
| # Expansion of @$. |
| m4_define([b4_lhs_location], |
| [(yyloc)]) |
| |
| |
| # b4_rhs_location(RULE-LENGTH, NUM) |
| # --------------------------------- |
| # Expansion of @NUM, where the current rule has RULE-LENGTH symbols |
| # on RHS. |
| m4_define([b4_rhs_location], |
| [(yylocation_stack_@{($1) - ($2)@})]) |
| |
| |
| # b4_parse_param_decl |
| # ------------------- |
| # Extra formal arguments of the constructor. |
| # Change the parameter names from "foo" into "foo_yyarg", so that |
| # there is no collision bw the user chosen attribute name, and the |
| # argument name in the constructor. |
| m4_define([b4_parse_param_decl], |
| [m4_ifset([b4_parse_param], |
| [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])]) |
| |
| m4_define([b4_parse_param_decl_1], |
| [$1_yyarg]) |
| |
| |
| |
| # b4_parse_param_cons |
| # ------------------- |
| # Extra initialisations of the constructor. |
| m4_define([b4_parse_param_cons], |
| [m4_ifset([b4_parse_param], |
| [ |
| b4_cc_constructor_calls(b4_parse_param)])]) |
| m4_define([b4_cc_constructor_calls], |
| [m4_map_sep([b4_cc_constructor_call], [, |
| ], [$@])]) |
| m4_define([b4_cc_constructor_call], |
| [$2 ($2_yyarg)]) |
| |
| # b4_parse_param_vars |
| # ------------------- |
| # Extra instance variables. |
| m4_define([b4_parse_param_vars], |
| [m4_ifset([b4_parse_param], |
| [ |
| /* User arguments. */ |
| b4_cc_var_decls(b4_parse_param)])]) |
| m4_define([b4_cc_var_decls], |
| [m4_map_sep([b4_cc_var_decl], [ |
| ], [$@])]) |
| m4_define([b4_cc_var_decl], |
| [ $1;]) |
| |
| |
| ## ---------## |
| ## Values. ## |
| ## ---------## |
| |
| # b4_yylloc_default_define |
| # ------------------------ |
| # Define YYLLOC_DEFAULT. |
| m4_define([b4_yylloc_default_define], |
| [[/* 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*/ false) |
| # endif |
| ]]) |