mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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100 lines
3.3 KiB
C++
100 lines
3.3 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_LIM_HPP
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#define SPROUT_WEED_PARSER_LIM_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/parser_result.hpp>
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#include <sprout/weed/limited.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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#include <sprout/weed/traits/parser/limit_of.hpp>
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namespace sprout {
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namespace weed {
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//
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// limit_p
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//
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template<typename Parser, std::size_t Limit>
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struct limit_p
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: public sprout::weed::parser_base
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{
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public:
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SPROUT_STATIC_CONSTEXPR std::size_t limit = Limit;
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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::weed::traits::attribute_of<Parser, Iterator, Context>
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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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sprout::weed::limited::category limited_category_;
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public:
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limit_p() = default;
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explicit SPROUT_CONSTEXPR limit_p(
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Parser const& p,
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sprout::weed::limited::category limited_category = sprout::weed::limited::discard
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)
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: expr_(sprout::weed::make_terminal_or_expr(p))
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, limited_category_(limited_category)
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{}
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SPROUT_CONSTEXPR sprout::weed::limited::category limited_category() const {
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return limited_category_;
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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, Iterator,
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Context const& ctx
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) const
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{
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return sprout::weed::eval(expr_, ctx).presult();
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}
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};
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template<typename Parser, std::size_t Limit>
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SPROUT_CONSTEXPR_OR_CONST std::size_t limit_p<Parser, Limit>::limit;
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//
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// lim
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//
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template<std::size_t Limit, typename Parser>
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SPROUT_CONSTEXPR sprout::weed::limit_p<Parser, Limit> lim(Parser const& p) {
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return sprout::weed::limit_p<Parser, Limit>(p);
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}
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template<std::size_t Limit, typename Parser>
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SPROUT_CONSTEXPR sprout::weed::limit_p<Parser, Limit> lim(
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Parser const& p,
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sprout::weed::limited::category limited_category
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)
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{
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return sprout::weed::limit_p<Parser, Limit>(p, limited_category);
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}
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namespace traits {
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//
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// limit_of
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//
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template<typename Parser, std::size_t Limit, typename Iterator, typename Context>
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struct limit_of<sprout::weed::limit_p<Parser, Limit>, Iterator, Context>
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: public std::integral_constant<std::size_t, Limit>
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{};
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} // namespace traits
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_PARSER_LIM_HPP
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