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165 lines
5.4 KiB
165 lines
5.4 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
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// Copyright (c) 2010 Bryce Lelbach |
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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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#if !defined(SPIRIT_KARMA_AS_DEC_18_0510PM) |
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#define SPIRIT_KARMA_AS_DEC_18_0510PM |
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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/meta_compiler.hpp> |
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#include <boost/spirit/home/karma/generator.hpp> |
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#include <boost/spirit/home/karma/domain.hpp> |
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#include <boost/spirit/home/karma/detail/output_iterator.hpp> |
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#include <boost/spirit/home/karma/detail/as.hpp> |
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#include <boost/spirit/home/support/unused.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/spirit/home/support/common_terminals.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/assert_msg.hpp> |
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#include <boost/spirit/home/support/container.hpp> |
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#include <boost/spirit/home/karma/detail/attributes.hpp> |
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namespace boost { namespace spirit { namespace karma |
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{ |
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template <typename T> |
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struct as |
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: stateful_tag_type<T, tag::as> |
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{ |
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BOOST_SPIRIT_ASSERT_MSG( |
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(traits::is_container<T>::type::value), |
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error_type_must_be_a_container, |
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(T)); |
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}; |
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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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// enables as_string[...] |
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template <> |
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struct use_directive<karma::domain, tag::as_string> |
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: mpl::true_ {}; |
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// enables as_wstring[...] |
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template <> |
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struct use_directive<karma::domain, tag::as_wstring> |
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: mpl::true_ {}; |
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// enables as<T>[...] |
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template <typename T> |
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struct use_directive<karma::domain, tag::stateful_tag<T, tag::as> > |
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: mpl::true_ |
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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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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS |
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using spirit::as_string; |
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using spirit::as_wstring; |
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#endif |
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using spirit::as_string_type; |
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using spirit::as_wstring_type; |
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/////////////////////////////////////////////////////////////////////////// |
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// as_directive allows to hook custom conversions to string into the |
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// output generation process |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename T> |
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struct as_directive |
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: unary_generator<as_directive<Subject, T> > |
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{ |
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typedef Subject subject_type; |
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typedef typename subject_type::properties properties; |
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as_directive(Subject const& subject) |
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: subject(subject) {} |
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template <typename Context, typename Iterator> |
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struct attribute |
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{ |
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typedef T type; |
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}; |
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template <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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if (!traits::valid_as<T>(attr)) |
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return false; |
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return subject.generate(sink, ctx, d, traits::as<T>(attr)) && |
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karma::delimit_out(sink, d); // always do post-delimiting |
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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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return info("as", subject.what(context)); |
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} |
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Subject 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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template <typename Subject, typename Modifiers> |
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struct make_directive<tag::as_string, Subject, Modifiers> |
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{ |
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typedef as_directive<Subject, std::string> result_type; |
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result_type operator()(unused_type, Subject const& subject |
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, unused_type) const |
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{ |
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return result_type(subject); |
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} |
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}; |
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template <typename Subject, typename Modifiers> |
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struct make_directive<tag::as_wstring, Subject, Modifiers> |
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{ |
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typedef as_directive<Subject, std::basic_string<wchar_t> > result_type; |
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result_type operator()(unused_type, Subject const& subject |
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, unused_type) const |
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{ |
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return result_type(subject); |
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} |
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}; |
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template <typename T, typename Subject, typename Modifiers> |
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struct make_directive<tag::stateful_tag<T, tag::as>, Subject, Modifiers> |
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{ |
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typedef as_directive<Subject, T> result_type; |
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result_type operator()(unused_type, Subject const& subject |
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, unused_type) const |
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{ |
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return result_type(subject); |
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} |
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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 Subject, typename T> |
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struct has_semantic_action<karma::as_directive<Subject, T> > |
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: unary_has_semantic_action<Subject> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename T, typename Attribute |
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, typename Context, typename Iterator> |
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struct handles_container<karma::as_directive<Subject, T>, Attribute |
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, Context, Iterator> |
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: mpl::false_ {}; // always dereference attribute if used in sequences |
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}}} |
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#endif
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