forked from enlightenment/efl
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
#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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