316 lines
12 KiB
C++
316 lines
12 KiB
C++
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// Copyright (c) 2001-2011 Hartmut Kaiser
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// Copyright (c) 2001-2011 Joel de Guzman
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//
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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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#ifndef BOOST_SPIRIT_KARMA_OPERATOR_SEQUENCE_HPP
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#define BOOST_SPIRIT_KARMA_OPERATOR_SEQUENCE_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/karma/domain.hpp>
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#include <boost/spirit/home/karma/generator.hpp>
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#include <boost/spirit/home/karma/meta_compiler.hpp>
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#include <boost/spirit/home/karma/detail/fail_function.hpp>
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#include <boost/spirit/home/karma/detail/pass_container.hpp>
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#include <boost/spirit/home/karma/detail/get_stricttag.hpp>
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#include <boost/spirit/home/support/info.hpp>
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#include <boost/spirit/home/support/detail/what_function.hpp>
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#include <boost/spirit/home/karma/detail/attributes.hpp>
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#include <boost/spirit/home/karma/detail/indirect_iterator.hpp>
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#include <boost/spirit/home/support/algorithm/any_if.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/spirit/home/support/sequence_base_id.hpp>
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#include <boost/spirit/home/support/has_semantic_action.hpp>
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#include <boost/spirit/home/support/handles_container.hpp>
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#include <boost/spirit/home/support/attributes.hpp>
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#include <boost/fusion/include/vector.hpp>
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#include <boost/fusion/include/as_vector.hpp>
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#include <boost/fusion/include/for_each.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/mpl/bitor.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/fusion/include/transform.hpp>
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#include <boost/mpl/accumulate.hpp>
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#include <boost/proto/operators.hpp>
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#include <boost/proto/tags.hpp>
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#include <boost/config.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// Enablers
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///////////////////////////////////////////////////////////////////////////
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template <>
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struct use_operator<karma::domain, proto::tag::shift_left> // enables <<
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: mpl::true_ {};
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template <>
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struct flatten_tree<karma::domain, proto::tag::shift_left> // flattens <<
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: mpl::true_ {};
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}}
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit { namespace traits
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{
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// specialization for sequences
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template <typename Elements>
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struct sequence_properties
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{
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struct element_properties
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{
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template <typename T>
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struct result;
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template <typename F, typename Element>
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struct result<F(Element)>
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{
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typedef properties_of<Element> type;
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};
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// never called, but needed for decltype-based result_of (C++0x)
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template <typename Element>
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typename result<element_properties(Element)>::type
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operator()(Element&&) const;
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#endif
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};
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typedef typename mpl::accumulate<
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typename fusion::result_of::transform<
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Elements, element_properties>::type
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, mpl::int_<karma::generator_properties::no_properties>
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, mpl::bitor_<mpl::_2, mpl::_1>
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>::type type;
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};
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}}}
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit { namespace karma
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{
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template <typename Elements, typename Strict, typename Derived>
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struct base_sequence : nary_generator<Derived>
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{
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typedef typename traits::sequence_properties<Elements>::type properties;
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base_sequence(Elements const& elements)
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: elements(elements) {}
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typedef Elements elements_type;
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struct sequence_base_id;
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template <typename Context, typename Iterator = unused_type>
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struct attribute
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{
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// Put all the element attributes in a tuple
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typedef typename traits::build_attribute_sequence<
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Elements, Context, traits::sequence_attribute_transform
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, Iterator, karma::domain
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>::type all_attributes;
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// Now, build a fusion vector over the attributes. Note
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// that build_fusion_vector 1) removes all unused attributes
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// and 2) may return unused_type if all elements have
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// unused_type(s).
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typedef typename
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traits::build_fusion_vector<all_attributes>::type
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type_;
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// Finally, strip single element vectors into its
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// naked form: vector1<T> --> T
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typedef typename
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traits::strip_single_element_vector<type_>::type
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type;
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};
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// standard case. Attribute is a fusion tuple
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template <
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typename OutputIterator, typename Context, typename Delimiter
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, typename Attribute, typename Pred1, typename Pred2>
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bool generate_impl(OutputIterator& sink, Context& ctx
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, Delimiter const& d, Attribute& attr_, Pred1, Pred2) const
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{
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typedef detail::fail_function<
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OutputIterator, Context, Delimiter> fail_function;
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typedef traits::attribute_not_unused<Context> predicate;
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// wrap the attribute in a tuple if it is not a tuple or if the
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// attribute of this sequence is a single element tuple
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typedef typename attribute<Context>::type_ attr_type_;
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typename traits::wrap_if_not_tuple<Attribute
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, typename mpl::and_<
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traits::one_element_sequence<attr_type_>
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, mpl::not_<traits::one_element_sequence<Attribute> >
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>::type
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>::type attr(attr_);
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// return false if *any* of the generators fail
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bool r = spirit::any_if(elements, attr
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, fail_function(sink, ctx, d), predicate());
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typedef typename traits::attribute_size<Attribute>::type size_type;
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// fail generating if sequences have not the same (logical) length
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return !r && (!Strict::value ||
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// This ignores container element count (which is not good),
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// but allows valid attributes to succeed. This will lead to
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// false positives (failing generators, even if they shouldn't)
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// if the embedded component is restricting the number of
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// container elements it consumes (i.e. repeat). This solution
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// is not optimal but much better than letting _all_ repetitive
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// components fail.
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Pred1::value ||
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size_type(traits::sequence_size<attr_type_>::value) == traits::size(attr_));
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}
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// Special case when Attribute is an stl container and the sequence's
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// attribute is not a one element sequence
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template <
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typename OutputIterator, typename Context, typename Delimiter
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, typename Attribute>
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bool generate_impl(OutputIterator& sink, Context& ctx
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, Delimiter const& d, Attribute const& attr_
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, mpl::true_, mpl::false_) const
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{
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// return false if *any* of the generators fail
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typedef detail::fail_function<
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OutputIterator, Context, Delimiter> fail_function;
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typedef typename traits::container_iterator<
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typename add_const<Attribute>::type
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>::type iterator_type;
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typedef
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typename traits::make_indirect_iterator<iterator_type>::type
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indirect_iterator_type;
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typedef detail::pass_container<
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fail_function, Attribute, indirect_iterator_type, mpl::true_>
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pass_container;
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iterator_type begin = traits::begin(attr_);
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iterator_type end = traits::end(attr_);
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pass_container pass(fail_function(sink, ctx, d),
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indirect_iterator_type(begin), indirect_iterator_type(end));
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bool r = fusion::any(elements, pass);
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// fail generating if sequences have not the same (logical) length
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return !r && (!Strict::value || begin == end);
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}
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// main generate function. Dispatches to generate_impl depending
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// on the Attribute type.
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template <
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typename OutputIterator, typename Context, typename Delimiter
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, typename Attribute>
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bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
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, Attribute const& attr) const
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{
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typedef typename traits::is_container<Attribute>::type
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is_container;
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typedef typename attribute<Context>::type_ attr_type_;
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typedef typename traits::one_element_sequence<attr_type_>::type
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is_one_element_sequence;
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return generate_impl(sink, ctx, d, attr, is_container()
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, is_one_element_sequence());
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}
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template <typename Context>
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info what(Context& context) const
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{
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info result("sequence");
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fusion::for_each(elements,
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spirit::detail::what_function<Context>(result, context));
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return result;
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}
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Elements elements;
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};
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template <typename Elements>
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struct sequence
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: base_sequence<Elements, mpl::false_, sequence<Elements> >
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{
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typedef base_sequence<Elements, mpl::false_, sequence> base_sequence_;
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sequence(Elements const& subject)
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: base_sequence_(subject) {}
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};
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template <typename Elements>
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struct strict_sequence
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: base_sequence<Elements, mpl::true_, strict_sequence<Elements> >
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{
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typedef base_sequence<Elements, mpl::true_, strict_sequence>
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base_sequence_;
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strict_sequence(Elements const& subject)
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: base_sequence_(subject) {}
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};
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///////////////////////////////////////////////////////////////////////////
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// Generator generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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namespace detail
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{
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template <typename Elements, bool strict_mode = false>
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struct make_sequence
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: make_nary_composite<Elements, sequence>
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{};
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template <typename Elements>
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struct make_sequence<Elements, true>
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: make_nary_composite<Elements, strict_sequence>
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{};
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}
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template <typename Elements, typename Modifiers>
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struct make_composite<proto::tag::shift_left, Elements, Modifiers>
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: detail::make_sequence<Elements, detail::get_stricttag<Modifiers>::value>
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{};
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///////////////////////////////////////////////////////////////////////////
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// Helper template allowing to get the required container type for a rule
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// attribute, which is part of a sequence.
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template <typename Iterator>
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struct make_sequence_iterator_range
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{
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typedef iterator_range<detail::indirect_iterator<Iterator> > type;
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};
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}}}
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namespace boost { namespace spirit { namespace traits
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{
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///////////////////////////////////////////////////////////////////////////
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template <typename Elements>
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struct has_semantic_action<karma::sequence<Elements> >
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: nary_has_semantic_action<Elements> {};
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template <typename Elements>
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struct has_semantic_action<karma::strict_sequence<Elements> >
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: nary_has_semantic_action<Elements> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Elements, typename Attribute, typename Context
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, typename Iterator>
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struct handles_container<karma::sequence<Elements>, Attribute, Context
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, Iterator>
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: mpl::true_ {};
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template <typename Elements, typename Attribute, typename Context
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, typename Iterator>
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struct handles_container<karma::strict_sequence<Elements>, Attribute
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, Context, Iterator>
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: mpl::true_ {};
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}}}
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#endif
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