| // Copyright (c) 2001-2011 Hartmut Kaiser |
| // Copyright (c) 2010 Bryce Lelbach |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| #if !defined(SPIRIT_KARMA_AS_DEC_18_0510PM) |
| #define SPIRIT_KARMA_AS_DEC_18_0510PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/spirit/home/karma/meta_compiler.hpp> |
| #include <boost/spirit/home/karma/generator.hpp> |
| #include <boost/spirit/home/karma/domain.hpp> |
| #include <boost/spirit/home/karma/detail/output_iterator.hpp> |
| #include <boost/spirit/home/karma/detail/as.hpp> |
| #include <boost/spirit/home/support/unused.hpp> |
| #include <boost/spirit/home/support/info.hpp> |
| #include <boost/spirit/home/support/common_terminals.hpp> |
| #include <boost/spirit/home/support/has_semantic_action.hpp> |
| #include <boost/spirit/home/support/handles_container.hpp> |
| #include <boost/spirit/home/support/assert_msg.hpp> |
| #include <boost/spirit/home/support/container.hpp> |
| #include <boost/spirit/home/karma/detail/attributes.hpp> |
| |
| namespace boost { namespace spirit { namespace karma |
| { |
| template <typename T> |
| struct as |
| : stateful_tag_type<T, tag::as> |
| { |
| BOOST_SPIRIT_ASSERT_MSG( |
| (traits::is_container<T>::type::value), |
| error_type_must_be_a_container, |
| (T)); |
| }; |
| }}} |
| |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| // enables as_string[...] |
| template <> |
| struct use_directive<karma::domain, tag::as_string> |
| : mpl::true_ {}; |
| |
| // enables as_wstring[...] |
| template <> |
| struct use_directive<karma::domain, tag::as_wstring> |
| : mpl::true_ {}; |
| |
| // enables as<T>[...] |
| template <typename T> |
| struct use_directive<karma::domain, tag::stateful_tag<T, tag::as> > |
| : mpl::true_ |
| {}; |
| }} |
| |
| namespace boost { namespace spirit { namespace karma |
| { |
| #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS |
| using spirit::as_string; |
| using spirit::as_wstring; |
| #endif |
| using spirit::as_string_type; |
| using spirit::as_wstring_type; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // as_directive allows to hook custom conversions to string into the |
| // output generation process |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Subject, typename T> |
| struct as_directive |
| : unary_generator<as_directive<Subject, T> > |
| { |
| typedef Subject subject_type; |
| typedef typename subject_type::properties properties; |
| |
| as_directive(Subject const& subject) |
| : subject(subject) {} |
| |
| template <typename Context, typename Iterator> |
| struct attribute |
| { |
| typedef T type; |
| }; |
| |
| template <typename OutputIterator, typename Context, typename Delimiter |
| , typename Attribute> |
| bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d |
| , Attribute const& attr) const |
| { |
| if (!traits::valid_as<T>(attr)) |
| return false; |
| |
| return subject.generate(sink, ctx, d, traits::as<T>(attr)) && |
| karma::delimit_out(sink, d); // always do post-delimiting |
| } |
| |
| template <typename Context> |
| info what(Context& context) const |
| { |
| return info("as", subject.what(context)); |
| } |
| |
| Subject subject; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Generator generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Subject, typename Modifiers> |
| struct make_directive<tag::as_string, Subject, Modifiers> |
| { |
| typedef as_directive<Subject, std::string> result_type; |
| result_type operator()(unused_type, Subject const& subject |
| , unused_type) const |
| { |
| return result_type(subject); |
| } |
| }; |
| |
| template <typename Subject, typename Modifiers> |
| struct make_directive<tag::as_wstring, Subject, Modifiers> |
| { |
| typedef as_directive<Subject, std::basic_string<wchar_t> > result_type; |
| result_type operator()(unused_type, Subject const& subject |
| , unused_type) const |
| { |
| return result_type(subject); |
| } |
| }; |
| |
| template <typename T, typename Subject, typename Modifiers> |
| struct make_directive<tag::stateful_tag<T, tag::as>, Subject, Modifiers> |
| { |
| typedef as_directive<Subject, T> result_type; |
| result_type operator()(unused_type, Subject const& subject |
| , unused_type) const |
| { |
| return result_type(subject); |
| } |
| }; |
| }}} |
| |
| namespace boost { namespace spirit { namespace traits |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Subject, typename T> |
| struct has_semantic_action<karma::as_directive<Subject, T> > |
| : unary_has_semantic_action<Subject> {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Subject, typename T, typename Attribute |
| , typename Context, typename Iterator> |
| struct handles_container<karma::as_directive<Subject, T>, Attribute |
| , Context, Iterator> |
| : mpl::false_ {}; // always dereference attribute if used in sequences |
| }}} |
| |
| #endif |