mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2013 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_OMIT_HPP
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#define SPROUT_WEED_PARSER_DIRECTIVE_OMIT_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/weed/unused.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/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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// omit_p
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//
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template<typename Parser>
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struct omit_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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: public sprout::identity<sprout::weed::unused>
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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())
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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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omit_p() = default;
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explicit SPROUT_CONSTEXPR omit_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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// omit_d
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//
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struct omit_d {
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public:
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template<typename Parser>
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SPROUT_CONSTEXPR sprout::weed::omit_p<Parser> operator[](Parser const& p) const {
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return sprout::weed::omit_p<Parser>(p);
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}
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};
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//
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// omit
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//
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SPROUT_CONSTEXPR sprout::weed::omit_d omit = sprout::weed::omit_d();
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_PARSER_DIRECTIVE_OMIT_HPP
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