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646 lines
19 KiB
646 lines
19 KiB
-*- Autoconf -*-
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# C++ skeleton for Bison
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# Copyright (C) 2002-2019 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Sanity checks, before defaults installed by c.m4.
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b4_percent_define_ifdef([[api.value.union.name]],
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[b4_complain_at(b4_percent_define_get_loc([[api.value.union.name]]),
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[named %union is invalid in C++])])
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m4_include(b4_skeletonsdir/[c.m4])
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b4_percent_define_check_kind([api.namespace], [code], [deprecated])
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b4_percent_define_check_kind([api.parser.class], [code], [deprecated])
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## ----- ##
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## C++. ##
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## ----- ##
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# b4_comment(TEXT, [PREFIX])
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# --------------------------
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# Put TEXT in comment. Prefix all the output lines with PREFIX.
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m4_define([b4_comment],
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[_b4_comment([$1], [$2// ], [$2// ])])
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# b4_inline(hh|cc)
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# ----------------
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# Expand to `inline\n ` if $1 is hh.
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m4_define([b4_inline],
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[m4_case([$1],
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[cc], [],
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[hh], [[inline
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]],
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[m4_fatal([$0: invalid argument: $1])])])
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# b4_cxx_portability
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# ------------------
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m4_define([b4_cxx_portability],
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[#if defined __cplusplus
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# define YY_CPLUSPLUS __cplusplus
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#else
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# define YY_CPLUSPLUS 199711L
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#endif
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// Support move semantics when possible.
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#if 201103L <= YY_CPLUSPLUS
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# define YY_MOVE std::move
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# define YY_MOVE_OR_COPY move
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# define YY_MOVE_REF(Type) Type&&
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# define YY_RVREF(Type) Type&&
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# define YY_COPY(Type) Type
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#else
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# define YY_MOVE
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# define YY_MOVE_OR_COPY copy
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# define YY_MOVE_REF(Type) Type&
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# define YY_RVREF(Type) const Type&
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# define YY_COPY(Type) const Type&
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#endif
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// Support noexcept when possible.
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#if 201103L <= YY_CPLUSPLUS
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# define YY_NOEXCEPT noexcept
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# define YY_NOTHROW
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#else
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# define YY_NOEXCEPT
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# define YY_NOTHROW throw ()
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#endif
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// Support constexpr when possible.
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#if 201703 <= YY_CPLUSPLUS
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# define YY_CONSTEXPR constexpr
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#else
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# define YY_CONSTEXPR
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#endif[]dnl
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])
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## ---------------- ##
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## Default values. ##
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## ---------------- ##
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b4_percent_define_default([[api.parser.class]], [[parser]])
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# Don't do that so that we remember whether we're using a user
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# request, or the default value.
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#
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# b4_percent_define_default([[api.location.type]], [[location]])
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b4_percent_define_default([[filename_type]], [[std::string]])
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# Make it a warning for those who used betas of Bison 3.0.
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b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))
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b4_percent_define_default([[global_tokens_and_yystype]], [[false]])
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b4_percent_define_default([[define_location_comparison]],
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[m4_if(b4_percent_define_get([[filename_type]]),
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[std::string], [[true]], [[false]])])
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## ----------- ##
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## Namespace. ##
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## ----------- ##
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m4_define([b4_namespace_ref], [b4_percent_define_get([[api.namespace]])])
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# Don't permit an empty b4_namespace_ref. Any '::parser::foo' appended to it
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# would compile as an absolute reference with 'parser' in the global namespace.
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# b4_namespace_open would open an anonymous namespace and thus establish
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# internal linkage. This would compile. However, it's cryptic, and internal
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# linkage for the parser would be specified in all translation units that
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# include the header, which is always generated. If we ever need to permit
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# internal linkage somehow, surely we can find a cleaner approach.
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m4_if(m4_bregexp(b4_namespace_ref, [^[ ]*$]), [-1], [],
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[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
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[[namespace reference is empty]])])
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# Instead of assuming the C++ compiler will do it, Bison should reject any
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# invalid b4_namespace_ref that would be converted to a valid
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# b4_namespace_open. The problem is that Bison doesn't always output
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# b4_namespace_ref to uncommented code but should reserve the ability to do so
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# in future releases without risking breaking any existing user grammars.
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# Specifically, don't allow empty names as b4_namespace_open would just convert
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# those into anonymous namespaces, and that might tempt some users.
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m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*::]), [-1], [],
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[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
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[[namespace reference has consecutive "::"]])])
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m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*$]), [-1], [],
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[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
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[[namespace reference has a trailing "::"]])])
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m4_define([b4_namespace_open],
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[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
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[namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
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[^\(.\)[ ]*::], [\1])),
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[::], [ { namespace ])[ {]])])
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m4_define([b4_namespace_close],
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[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
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m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
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[^\(.\)[ ]*\(::\)?\([^][:]\|:[^:]\)*],
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[\1])),
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[::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])
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# b4_token_enums
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# --------------
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# Output the definition of the tokens as enums.
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m4_define([b4_token_enums],
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[[enum yytokentype
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{
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]m4_join([,
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],
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b4_symbol_map([b4_token_enum]))[
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};]dnl
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])
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## ----------------- ##
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## Semantic Values. ##
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## ----------------- ##
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# b4_value_type_declare
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# ---------------------
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# Declare semantic_type.
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m4_define([b4_value_type_declare],
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[b4_value_type_setup[]dnl
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[ /// Symbol semantic values.
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]m4_bmatch(b4_percent_define_get_kind([[api.value.type]]),
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[code],
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[[ typedef ]b4_percent_define_get([[api.value.type]])[ semantic_type;]],
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[m4_bmatch(b4_percent_define_get([[api.value.type]]),
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[union\|union-directive],
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[[ union semantic_type
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{
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]b4_user_union_members[
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};]])])dnl
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])
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# b4_public_types_declare
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# -----------------------
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# Define the public types: token, semantic value, location, and so forth.
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# Depending on %define token_lex, may be output in the header or source file.
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m4_define([b4_public_types_declare],
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[[#ifndef ]b4_api_PREFIX[STYPE
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]b4_value_type_declare[
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#else
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typedef ]b4_api_PREFIX[STYPE semantic_type;
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#endif]b4_locations_if([
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/// Symbol locations.
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typedef b4_percent_define_get([[api.location.type]],
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[[location]]) location_type;])[
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/// Syntax errors thrown from user actions.
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struct syntax_error : std::runtime_error
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{
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syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
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: std::runtime_error (m)]b4_locations_if([
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, location (l)])[
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{}
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syntax_error (const syntax_error& s)
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: std::runtime_error (s.what ())]b4_locations_if([
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, location (s.location)])[
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{}
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~syntax_error () YY_NOEXCEPT YY_NOTHROW;]b4_locations_if([
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location_type location;])[
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};
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/// Tokens.
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struct token
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{
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]b4_token_enums[
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};
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/// (External) token type, as returned by yylex.
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typedef token::yytokentype token_type;
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/// Symbol type: an internal symbol number.
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typedef int symbol_number_type;
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/// The symbol type number to denote an empty symbol.
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enum { empty_symbol = -2 };
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/// Internal symbol number for tokens (subsumed by symbol_number_type).
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typedef ]b4_int_type_for([b4_translate])[ token_number_type;
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]])
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# b4_symbol_type_define
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# ---------------------
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# Define symbol_type, the external type for symbols used for symbol
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# constructors.
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m4_define([b4_symbol_type_define],
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[[ /// A complete symbol.
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///
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/// Expects its Base type to provide access to the symbol type
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/// via type_get ().
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///
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/// Provide access to semantic value]b4_locations_if([ and location])[.
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template <typename Base>
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struct basic_symbol : Base
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{
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/// Alias to Base.
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typedef Base super_type;
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/// Default constructor.
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basic_symbol ()
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: value ()]b4_locations_if([
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, location ()])[
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{}
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#if 201103L <= YY_CPLUSPLUS
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/// Move constructor.
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basic_symbol (basic_symbol&& that);
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#endif
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/// Copy constructor.
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basic_symbol (const basic_symbol& that);]b4_variant_if([[
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/// Constructor for valueless symbols, and symbols from each type.
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]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
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/// Constructor for valueless symbols.
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basic_symbol (typename Base::kind_type t]b4_locations_if([,
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YY_MOVE_REF (location_type) l])[);
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/// Constructor for symbols with semantic value.
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basic_symbol (typename Base::kind_type t,
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YY_RVREF (semantic_type) v]b4_locations_if([,
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YY_RVREF (location_type) l])[);
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]])[
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/// Destroy the symbol.
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~basic_symbol ()
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{
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clear ();
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}
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/// Destroy contents, and record that is empty.
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void clear ()
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{]b4_variant_if([[
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// User destructor.
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symbol_number_type yytype = this->type_get ();
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basic_symbol<Base>& yysym = *this;
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(void) yysym;
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switch (yytype)
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{
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]b4_symbol_foreach([b4_symbol_destructor])dnl
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[ default:
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break;
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}
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// Type destructor.
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]b4_symbol_variant([[yytype]], [[value]], [[template destroy]])])[
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Base::clear ();
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}
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/// Whether empty.
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bool empty () const YY_NOEXCEPT;
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/// Destructive move, \a s is emptied into this.
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void move (basic_symbol& s);
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/// The semantic value.
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semantic_type value;]b4_locations_if([
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/// The location.
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location_type location;])[
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private:
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#if YY_CPLUSPLUS < 201103L
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/// Assignment operator.
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basic_symbol& operator= (const basic_symbol& that);
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#endif
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};
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/// Type access provider for token (enum) based symbols.
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struct by_type
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{
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/// Default constructor.
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by_type ();
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#if 201103L <= YY_CPLUSPLUS
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/// Move constructor.
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by_type (by_type&& that);
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#endif
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/// Copy constructor.
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by_type (const by_type& that);
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/// The symbol type as needed by the constructor.
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typedef token_type kind_type;
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/// Constructor from (external) token numbers.
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by_type (kind_type t);
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/// Record that this symbol is empty.
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void clear ();
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/// Steal the symbol type from \a that.
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void move (by_type& that);
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/// The (internal) type number (corresponding to \a type).
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/// \a empty when empty.
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symbol_number_type type_get () const YY_NOEXCEPT;
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/// The symbol type.
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/// \a empty_symbol when empty.
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/// An int, not token_number_type, to be able to store empty_symbol.
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int type;
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};
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/// "External" symbols: returned by the scanner.
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struct symbol_type : basic_symbol<by_type>
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{]b4_variant_if([[
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/// Superclass.
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typedef basic_symbol<by_type> super_type;
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/// Empty symbol.
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symbol_type () {}
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/// Constructor for valueless symbols, and symbols from each type.
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]b4_type_foreach([_b4_token_constructor_define])dnl
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])[};
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]])
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# b4_public_types_define(hh|cc)
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# -----------------------------
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# Provide the implementation needed by the public types.
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m4_define([b4_public_types_define],
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[[ // basic_symbol.
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#if 201103L <= YY_CPLUSPLUS
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template <typename Base>
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]b4_parser_class[::basic_symbol<Base>::basic_symbol (basic_symbol&& that)
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: Base (std::move (that))
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, value (]b4_variant_if([], [std::move (that.value)]))b4_locations_if([
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, location (std::move (that.location))])[
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{]b4_variant_if([
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b4_symbol_variant([this->type_get ()], [value], [move],
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[std::move (that.value)])
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])[}
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#endif
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template <typename Base>
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]b4_parser_class[::basic_symbol<Base>::basic_symbol (const basic_symbol& that)
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: Base (that)
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, value (]b4_variant_if([], [that.value]))b4_locations_if([
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, location (that.location)])[
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{]b4_variant_if([
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b4_symbol_variant([this->type_get ()], [value], [copy],
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[YY_MOVE (that.value)])
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])[}
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]b4_variant_if([], [[
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/// Constructor for valueless symbols.
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template <typename Base>
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]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
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[typename Base::kind_type t],
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b4_locations_if([YY_MOVE_REF (location_type) l]))[)
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: Base (t)
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, value ()]b4_locations_if([
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, location (l)])[
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{}
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template <typename Base>
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]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
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[typename Base::kind_type t],
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[YY_RVREF (semantic_type) v],
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b4_locations_if([YY_RVREF (location_type) l]))[)
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: Base (t)
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, value (]b4_variant_if([], [YY_MOVE (v)])[)]b4_locations_if([
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, location (YY_MOVE (l))])[
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{]b4_variant_if([[
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(void) v;
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]b4_symbol_variant([this->type_get ()], [value], [YY_MOVE_OR_COPY], [YY_MOVE (v)])])[}]])[
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template <typename Base>
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bool
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]b4_parser_class[::basic_symbol<Base>::empty () const YY_NOEXCEPT
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{
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return Base::type_get () == empty_symbol;
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}
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template <typename Base>
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void
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]b4_parser_class[::basic_symbol<Base>::move (basic_symbol& s)
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{
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super_type::move (s);
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]b4_variant_if([b4_symbol_variant([this->type_get ()], [value], [move],
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[YY_MOVE (s.value)])],
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[value = YY_MOVE (s.value);])[]b4_locations_if([
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location = YY_MOVE (s.location);])[
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}
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// by_type.
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]b4_inline([$1])b4_parser_class[::by_type::by_type ()
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: type (empty_symbol)
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{}
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#if 201103L <= YY_CPLUSPLUS
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]b4_inline([$1])b4_parser_class[::by_type::by_type (by_type&& that)
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: type (that.type)
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{
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that.clear ();
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}
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#endif
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]b4_inline([$1])b4_parser_class[::by_type::by_type (const by_type& that)
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: type (that.type)
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{}
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]b4_inline([$1])b4_parser_class[::by_type::by_type (token_type t)
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: type (yytranslate_ (t))
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{}
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]b4_inline([$1])[void
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]b4_parser_class[::by_type::clear ()
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{
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type = empty_symbol;
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}
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]b4_inline([$1])[void
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]b4_parser_class[::by_type::move (by_type& that)
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{
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type = that.type;
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that.clear ();
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}
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]b4_inline([$1])[int
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]b4_parser_class[::by_type::type_get () const YY_NOEXCEPT
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{
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return type;
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}
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]])
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# b4_token_constructor_define
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# ----------------------------
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# Define symbol constructors for all the value types.
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# Use at class-level. Redefined in variant.hh.
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m4_define([b4_token_constructor_define], [])
|
|
|
|
|
|
# b4_yytranslate_define(cc|hh)
|
|
# ----------------------------
|
|
# Define yytranslate_. Sometimes used in the header file ($1=hh),
|
|
# sometimes in the cc file.
|
|
m4_define([b4_yytranslate_define],
|
|
[ b4_inline([$1])b4_parser_class[::token_number_type
|
|
]b4_parser_class[::yytranslate_ (int t)
|
|
{
|
|
]b4_api_token_raw_if(
|
|
[[ return static_cast<token_number_type> (t);]],
|
|
[[ // YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to
|
|
// TOKEN-NUM as returned by yylex.
|
|
static
|
|
const token_number_type
|
|
translate_table[] =
|
|
{
|
|
]b4_translate[
|
|
};
|
|
const int user_token_number_max_ = ]b4_user_token_number_max[;
|
|
|
|
if (t <= 0)
|
|
return yyeof_;
|
|
else if (t <= user_token_number_max_)
|
|
return translate_table[t];
|
|
else
|
|
return yy_undef_token_;]])[
|
|
}
|
|
]])
|
|
|
|
|
|
# b4_lhs_value([TYPE])
|
|
# --------------------
|
|
m4_define([b4_lhs_value],
|
|
[b4_symbol_value([yyval], [$1])])
|
|
|
|
|
|
# b4_rhs_value(RULE-LENGTH, POS, [TYPE])
|
|
# --------------------------------------
|
|
# FIXME: Dead code.
|
|
m4_define([b4_rhs_value],
|
|
[b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])
|
|
|
|
|
|
# b4_lhs_location()
|
|
# -----------------
|
|
# Expansion of @$.
|
|
m4_define([b4_lhs_location],
|
|
[(yyloc)])
|
|
|
|
|
|
# b4_rhs_location(RULE-LENGTH, POS)
|
|
# ---------------------------------
|
|
# Expansion of @POS, 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 (false)
|
|
# endif
|
|
]])
|
|
|
|
## -------- ##
|
|
## Checks. ##
|
|
## -------- ##
|
|
|
|
b4_token_ctor_if([b4_variant_if([],
|
|
[b4_fatal_at(b4_percent_define_get_loc(api.token.constructor),
|
|
[cannot use '%s' without '%s'],
|
|
[%define api.token.constructor],
|
|
[%define api.value.type variant]))])])
|