130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Hartmut Kaiser
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Copyright (c) 2001-2014 Joel de Guzman
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Copyright (c) 2013 Agustin Berge
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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 BOOST_SPIRIT_X3_ATTR_JUL_23_2008_0956AM
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#define BOOST_SPIRIT_X3_ATTR_JUL_23_2008_0956AM
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#include <boost/spirit/home/x3/core/parser.hpp>
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#include <boost/spirit/home/x3/support/unused.hpp>
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#include <boost/spirit/home/x3/support/traits/container_traits.hpp>
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#include <boost/spirit/home/x3/support/traits/move_to.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <cstddef>
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#include <string>
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#include <utility>
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namespace boost { namespace spirit { namespace x3
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{
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namespace detail
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{
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template <typename Value, std::size_t N
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, typename = std::make_index_sequence<N>>
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struct array_helper;
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template <typename Value, std::size_t N, std::size_t... Is>
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struct array_helper<Value, N, std::index_sequence<Is...>>
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{
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constexpr array_helper(Value const (&value)[N])
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: value_{ value[Is]... } {}
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constexpr array_helper(Value (&&value)[N])
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: value_{ static_cast<Value&&>(value[Is])... } {}
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// silence MSVC warning C4512: assignment operator could not be generated
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array_helper& operator= (array_helper const&) = delete;
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Value value_[N];
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};
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}
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template <typename Value>
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struct attr_parser : parser<attr_parser<Value>>
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{
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typedef Value attribute_type;
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static bool const has_attribute =
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!is_same<unused_type, attribute_type>::value;
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static bool const handles_container =
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traits::is_container<attribute_type>::value;
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constexpr attr_parser(Value const& value)
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: value_(value) {}
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constexpr attr_parser(Value&& value)
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: value_(std::move(value)) {}
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template <typename Iterator, typename Context
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, typename RuleContext, typename Attribute>
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bool parse(Iterator& /* first */, Iterator const& /* last */
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, Context const& /* context */, RuleContext&, Attribute& attr_) const
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{
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// $$$ Change to copy_to once we have it $$$
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traits::move_to(value_, attr_);
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return true;
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}
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Value value_;
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// silence MSVC warning C4512: assignment operator could not be generated
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attr_parser& operator= (attr_parser const&) = delete;
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};
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template <typename Value, std::size_t N>
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struct attr_parser<Value[N]> : parser<attr_parser<Value[N]>>
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, detail::array_helper<Value, N>
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{
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using detail::array_helper<Value, N>::array_helper;
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typedef Value attribute_type[N];
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static bool const has_attribute =
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!is_same<unused_type, attribute_type>::value;
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static bool const handles_container = true;
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template <typename Iterator, typename Context
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, typename RuleContext, typename Attribute>
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bool parse(Iterator& /* first */, Iterator const& /* last */
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, Context const& /* context */, RuleContext&, Attribute& attr_) const
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{
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// $$$ Change to copy_to once we have it $$$
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traits::move_to(this->value_ + 0, this->value_ + N, attr_);
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return true;
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}
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// silence MSVC warning C4512: assignment operator could not be generated
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attr_parser& operator= (attr_parser const&) = delete;
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};
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template <typename Value>
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struct get_info<attr_parser<Value>>
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{
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typedef std::string result_type;
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std::string operator()(attr_parser<Value> const& /*p*/) const
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{
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return "attr";
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}
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};
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struct attr_gen
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{
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template <typename Value>
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constexpr attr_parser<typename remove_cv<
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typename remove_reference<Value>::type>::type>
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operator()(Value&& value) const
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{
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return { std::forward<Value>(value) };
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}
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};
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constexpr auto attr = attr_gen{};
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}}}
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#endif
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