forked from enlightenment/efl
104 lines
3.1 KiB
C++
104 lines
3.1 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_INTEGRAL_HH
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#define EOLIAN_CXX_INTEGRAL_HH
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#include <cstdlib>
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#include <cstring>
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#include "grammar/generator.hpp"
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#include "grammar/attributes.hpp"
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#include "grammar/case.hpp"
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namespace efl { namespace eolian { namespace grammar {
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namespace detail {
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template <typename OutputIterator, typename T>
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void generate_integral(OutputIterator sink, T integer)
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{
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std::stringstream stm;
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stm << integer;
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std::string string = stm.str();
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std::copy(string.begin(), string.end(), sink);
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}
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}
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// literal
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template <typename T>
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struct literal_integral_generator
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{
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T integral;
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template <typename OutputIterator, typename Attribute, typename Context>
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bool generate(OutputIterator sink, Attribute const&, Context const&) const
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{
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detail::generate_integral(sink, integral);
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return true;
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}
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};
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template <typename T, typename Enable = typename std::enable_if<std::is_integral<T>::value>::type>
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literal_integral_generator<T> as_generator(T&& literal) { return {std::forward<T>(literal)}; }
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literal_integral_generator<std::size_t> as_generator(std::size_t literal) { return {literal}; }
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struct integral_terminal {
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template <typename T>
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literal_integral_generator<T> operator()(T literal) const
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{
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return {literal};
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}
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} const int_ = {};
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struct integral_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&) const
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{
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detail::generate_integral(sink, attribute);
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return true;
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}
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};
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integral_generator as_generator(integral_terminal) { return {}; }
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template <typename T>
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struct is_eager_generator<literal_integral_generator<T>> : std::true_type {};
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template <>
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struct is_eager_generator<integral_generator> : std::true_type {};
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template <typename T>
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struct is_generator<literal_integral_generator<T>> : std::true_type {};
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template <>
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struct is_generator<integral_generator> : std::true_type {};
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template <typename T>
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struct is_generator<T, typename std::enable_if<std::is_integral<T>::value>::type> : std::true_type {};
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template <>
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struct is_generator<integral_terminal> : std::true_type {};
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namespace type_traits {
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template <typename T>
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struct attributes_needed<literal_integral_generator<T>> : std::integral_constant<int, 0> {};
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template <>
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struct attributes_needed<integral_generator> : std::integral_constant<int, 1> {};
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template <>
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struct attributes_needed<integral_terminal> : std::integral_constant<int, 1> {};
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}
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} } }
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#endif
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