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| 1 -*- Autoconf -*- |
| 2 |
| 3 # C++ skeleton for Bison |
| 4 |
| 5 # Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundatio
n, |
| 6 # Inc. |
| 7 |
| 8 # This program is free software: you can redistribute it and/or modify |
| 9 # it under the terms of the GNU General Public License as published by |
| 10 # the Free Software Foundation, either version 3 of the License, or |
| 11 # (at your option) any later version. |
| 12 # |
| 13 # This program is distributed in the hope that it will be useful, |
| 14 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 # GNU General Public License for more details. |
| 17 # |
| 18 # You should have received a copy of the GNU General Public License |
| 19 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 |
| 21 m4_include(b4_pkgdatadir/[c.m4]) |
| 22 |
| 23 ## ---------------- ## |
| 24 ## Default values. ## |
| 25 ## ---------------- ## |
| 26 |
| 27 # Default parser class name. |
| 28 b4_percent_define_default([[parser_class_name]], [[parser]]) |
| 29 b4_percent_define_default([[location_type]], [[location]]) |
| 30 b4_percent_define_default([[filename_type]], [[std::string]]) |
| 31 b4_percent_define_default([[namespace]], m4_defn([b4_prefix])) |
| 32 b4_percent_define_default([[global_tokens_and_yystype]], [[false]]) |
| 33 b4_percent_define_default([[define_location_comparison]], |
| 34 [m4_if(b4_percent_define_get([[filename_type]]), |
| 35 [std::string], [[true]], [[false]])]) |
| 36 |
| 37 |
| 38 ## ----------- ## |
| 39 ## Namespace. ## |
| 40 ## ----------- ## |
| 41 |
| 42 m4_define([b4_namespace_ref], [b4_percent_define_get([[namespace]])]) |
| 43 |
| 44 # Don't permit an empty b4_namespace_ref. Any `::parser::foo' appended to it |
| 45 # would compile as an absolute reference with `parser' in the global namespace. |
| 46 # b4_namespace_open would open an anonymous namespace and thus establish |
| 47 # internal linkage. This would compile. However, it's cryptic, and internal |
| 48 # linkage for the parser would be specified in all translation units that |
| 49 # include the header, which is always generated. If we ever need to permit |
| 50 # internal linkage somehow, surely we can find a cleaner approach. |
| 51 m4_if(m4_bregexp(b4_namespace_ref, [^[ ]*$]), [-1], [], |
| 52 [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| 53 [[namespace reference is empty]])]) |
| 54 |
| 55 # Instead of assuming the C++ compiler will do it, Bison should reject any |
| 56 # invalid b4_namepsace_ref that would be converted to a valid |
| 57 # b4_namespace_open. The problem is that Bison doesn't always output |
| 58 # b4_namespace_ref to uncommented code but should reserve the ability to do so |
| 59 # in future releases without risking breaking any existing user grammars. |
| 60 # Specifically, don't allow empty names as b4_namespace_open would just convert |
| 61 # those into anonymous namespaces, and that might tempt some users. |
| 62 m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*::]), [-1], [], |
| 63 [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| 64 [[namespace reference has consecutive "::"]])]) |
| 65 m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*$]), [-1], [], |
| 66 [b4_complain_at(b4_percent_define_get_loc([[namespace]]), |
| 67 [[namespace reference has a trailing "::"]])]) |
| 68 |
| 69 m4_define([b4_namespace_open], |
| 70 [b4_user_code([b4_percent_define_get_syncline([[namespace]]) |
| 71 [namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref), |
| 72 [^\(.\)[ ]*::], [\1])), |
| 73 [::], [ { namespace ])[ {]])]) |
| 74 |
| 75 m4_define([b4_namespace_close], |
| 76 [b4_user_code([b4_percent_define_get_syncline([[namespace]]) |
| 77 m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref), |
| 78 [^\(.\)[ ]*\(::\)?\([^][:]\|:[^][:]\)*], |
| 79 [\1])), |
| 80 [::\([^][:]\|:[^][:]\)*], [} ])[} // ]b4_namespace_ref])]) |
| 81 |
| 82 |
| 83 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER) |
| 84 # ----------------------------------------------------- |
| 85 # Output the definition of the tokens as enums. |
| 86 m4_define([b4_token_enums], |
| 87 [/* Tokens. */ |
| 88 enum yytokentype { |
| 89 m4_map_sep([ b4_token_enum], [, |
| 90 ], |
| 91 [$@]) |
| 92 }; |
| 93 ]) |
| 94 |
| 95 |
| 96 ## ----------------- ## |
| 97 ## Semantic Values. ## |
| 98 ## ----------------- ## |
| 99 |
| 100 |
| 101 # b4_lhs_value([TYPE]) |
| 102 # -------------------- |
| 103 # Expansion of $<TYPE>$. |
| 104 m4_define([b4_lhs_value], |
| 105 [(yyval[]m4_ifval([$1], [.$1]))]) |
| 106 |
| 107 |
| 108 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) |
| 109 # -------------------------------------- |
| 110 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH |
| 111 # symbols on RHS. |
| 112 m4_define([b4_rhs_value], |
| 113 [(yysemantic_stack_@{($1) - ($2)@}m4_ifval([$3], [.$3]))]) |
| 114 |
| 115 # b4_lhs_location() |
| 116 # ----------------- |
| 117 # Expansion of @$. |
| 118 m4_define([b4_lhs_location], |
| 119 [(yyloc)]) |
| 120 |
| 121 |
| 122 # b4_rhs_location(RULE-LENGTH, NUM) |
| 123 # --------------------------------- |
| 124 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols |
| 125 # on RHS. |
| 126 m4_define([b4_rhs_location], |
| 127 [(yylocation_stack_@{($1) - ($2)@})]) |
| 128 |
| 129 |
| 130 # b4_parse_param_decl |
| 131 # ------------------- |
| 132 # Extra formal arguments of the constructor. |
| 133 # Change the parameter names from "foo" into "foo_yyarg", so that |
| 134 # there is no collision bw the user chosen attribute name, and the |
| 135 # argument name in the constructor. |
| 136 m4_define([b4_parse_param_decl], |
| 137 [m4_ifset([b4_parse_param], |
| 138 [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])]) |
| 139 |
| 140 m4_define([b4_parse_param_decl_1], |
| 141 [$1_yyarg]) |
| 142 |
| 143 |
| 144 |
| 145 # b4_parse_param_cons |
| 146 # ------------------- |
| 147 # Extra initialisations of the constructor. |
| 148 m4_define([b4_parse_param_cons], |
| 149 [m4_ifset([b4_parse_param], |
| 150 [ |
| 151 b4_cc_constructor_calls(b4_parse_param)])]) |
| 152 m4_define([b4_cc_constructor_calls], |
| 153 [m4_map_sep([b4_cc_constructor_call], [, |
| 154 ], [$@])]) |
| 155 m4_define([b4_cc_constructor_call], |
| 156 [$2 ($2_yyarg)]) |
| 157 |
| 158 # b4_parse_param_vars |
| 159 # ------------------- |
| 160 # Extra instance variables. |
| 161 m4_define([b4_parse_param_vars], |
| 162 [m4_ifset([b4_parse_param], |
| 163 [ |
| 164 /* User arguments. */ |
| 165 b4_cc_var_decls(b4_parse_param)])]) |
| 166 m4_define([b4_cc_var_decls], |
| 167 [m4_map_sep([b4_cc_var_decl], [ |
| 168 ], [$@])]) |
| 169 m4_define([b4_cc_var_decl], |
| 170 [ $1;]) |
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