forked from enlightenment/efl
88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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* Copyright 2019 by its authors. See AUTHORS.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef EOLIAN_CXX_ATTRIBUTE_CONDITIONAL_HH
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#define EOLIAN_CXX_ATTRIBUTE_CONDITIONAL_HH
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#include "grammar/generator.hpp"
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namespace efl { namespace eolian { namespace grammar {
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template <typename F, typename G>
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struct functional_attribute_conditional_generator
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{
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template <typename OutputIterator, typename Attribute, typename Context>
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bool generate(OutputIterator sink, Attribute const& attribute, Context const& ctx) const
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{
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if(f(attribute))
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return as_generator(g).generate(sink, attribute, ctx);
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else
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return false;
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}
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F f;
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G g;
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};
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template <typename F>
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struct functional_attribute_conditional_directive
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{
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template <typename G>
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functional_attribute_conditional_generator<F, G> operator[](G g) const
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{
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return {f, g};
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}
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template <typename OutputIterator, typename Attribute, typename Context>
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bool generate(OutputIterator, Attribute const& attribute, Context const&) const
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{
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return f(attribute);
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}
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F f;
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};
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struct attribute_conditional_terminal
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{
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template <typename F>
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functional_attribute_conditional_directive<F> operator()(F f) const
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{
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return {f};
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}
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} const attribute_conditional = {};
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template <typename F, typename G>
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struct is_eager_generator<functional_attribute_conditional_generator<F, G>> : std::true_type {};
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template <typename F>
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struct is_eager_generator<functional_attribute_conditional_directive<F>> : std::true_type {};
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template <typename F, typename G>
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struct is_generator<functional_attribute_conditional_generator<F, G>> : std::true_type {};
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template <typename F>
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struct is_generator<functional_attribute_conditional_directive<F>> : std::true_type {};
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namespace type_traits {
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template <typename F, typename G>
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struct attributes_needed<functional_attribute_conditional_generator<F, G>>
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: std::conditional<(attributes_needed<G>::value >= 1)
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, attributes_needed<G>
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, std::integral_constant<int, 1>>::type {};
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template <typename F>
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struct attributes_needed<functional_attribute_conditional_directive<F>> : std::integral_constant<int, 1> {};
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}
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} } }
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#endif
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