mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_WEED_PARSER_DIRECTIVE_AS_TUPLE_HPP
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#define SPROUT_WEED_PARSER_DIRECTIVE_AS_TUPLE_HPP
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/weed/parser_result.hpp>
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#include <sprout/weed/expr/make_terminal_or_expr.hpp>
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#include <sprout/weed/expr/eval.hpp>
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#include <sprout/weed/parser/parser_base.hpp>
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#include <sprout/weed/traits/type/is_unused.hpp>
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#include <sprout/weed/traits/expr/terminal_or_expr_of.hpp>
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#include <sprout/weed/traits/parser/attribute_of.hpp>
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namespace sprout {
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namespace weed {
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//
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// as_tuple_p
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//
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template<typename Parser>
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struct as_tuple_p
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: public sprout::weed::parser_base
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{
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public:
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template<typename Context, typename Iterator>
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struct attribute {
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private:
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typedef typename sprout::weed::traits::attribute_of<Parser, Iterator, Context>::type attr_type;
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private:
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static_assert(!sprout::weed::traits::is_unused<attr_type>::value, "invalid attribute : unused");
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public:
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typedef sprout::tuples::tuple<attr_type> type;
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};
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template<typename Context, typename Iterator>
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struct result
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: public sprout::identity<sprout::weed::parser_result<Iterator, typename attribute<Context, Iterator>::type> >
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{};
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private:
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typedef typename sprout::weed::traits::terminal_or_expr_of<Parser>::type expr_type;
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private:
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expr_type expr_;
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private:
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template<typename Context, typename Iterator, typename Result>
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SPROUT_CONSTEXPR typename result<Context, Iterator>::type call(
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Iterator first,
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Result const& res
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) const
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{
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typedef typename result<Context, Iterator>::type result_type;
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typedef typename attribute<Context, Iterator>::type attribute_type;
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return res.success()
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? result_type(true, res.current(), attribute_type(res.attr()))
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: result_type(false, first, attribute_type())
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;
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}
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public:
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SPROUT_CONSTEXPR as_tuple_p() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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explicit SPROUT_CONSTEXPR as_tuple_p(
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Parser const& p
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)
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: expr_(sprout::weed::make_terminal_or_expr(p))
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{}
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template<typename Context, typename Iterator>
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SPROUT_CONSTEXPR typename result<Context, Iterator>::type operator()(
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Iterator first, Iterator,
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Context const& ctx
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) const
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{
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return call<Context>(first, sprout::weed::eval(expr_, ctx));
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}
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};
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//
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// as_tuple_d
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//
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struct as_tuple_d {
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public:
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template<typename Parser>
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SPROUT_CONSTEXPR sprout::weed::as_tuple_p<Parser> operator[](Parser const& p) const {
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return sprout::weed::as_tuple_p<Parser>(p);
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}
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};
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//
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// as_tuple
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//
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SPROUT_CONSTEXPR sprout::weed::as_tuple_d as_tuple = sprout::weed::as_tuple_d();
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_PARSER_DIRECTIVE_AS_TUPLE_HPP
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