mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_CONTEXT_PARSE_CONTEXT_TERMINAL_STRING_HPP
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#define SPROUT_WEED_CONTEXT_PARSE_CONTEXT_TERMINAL_STRING_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/container/begin.hpp>
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#include <sprout/container/end.hpp>
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#include <sprout/container/size.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/algorithm/equal.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/weed/eval_result.hpp>
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#include <sprout/weed/expr/tag.hpp>
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#include <sprout/weed/traits/type/is_string.hpp>
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#include <sprout/weed/traits/expr/tag_of.hpp>
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#include <sprout/weed/traits/parser/attribute_of.hpp>
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#include <sprout/weed/context/parse_context_fwd.hpp>
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namespace sprout {
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namespace weed {
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//
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// parse_context::eval
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//
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template<typename Iterator>
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template<typename Expr>
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struct parse_context<Iterator>::eval<
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Expr,
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typename std::enable_if<
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std::is_same<
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typename sprout::weed::traits::tag_of<Expr>::type,
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sprout::weed::tag::terminal
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>::value
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&& sprout::weed::traits::is_string<
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typename sprout::tuples::tuple_element<0, typename Expr::args_type>::type
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>::value
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>::type
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> {
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private:
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typedef sprout::weed::parse_context<Iterator> context_type;
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public:
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typedef sprout::weed::unused attribute_type;
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typedef sprout::weed::eval_result<context_type, Iterator, attribute_type> result_type;
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private:
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template<typename Arg>
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SPROUT_CONSTEXPR result_type call(
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Arg const& arg,
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context_type const& ctx
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) const
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{
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return sprout::distance(ctx.begin(), ctx.end()) >= sprout::size(arg)
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&&sprout::equal(sprout::begin(arg), sprout::end(arg), ctx.begin())
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? result_type(
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true,
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sprout::next(ctx.begin(), sprout::size(arg)),
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attribute_type(),
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context_type(ctx, sprout::next(ctx.begin(), sprout::size(arg)))
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)
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: result_type(false, ctx.begin(), attribute_type(), ctx)
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;
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}
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public:
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SPROUT_CONSTEXPR result_type operator()(
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Expr const& expr,
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context_type const& ctx
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) const
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{
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return call(sprout::tuples::get<0>(expr.args()), ctx);
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}
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};
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_CONTEXT_PARSE_CONTEXT_TERMINAL_STRING_HPP
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