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