Chris@16: //  Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16: //  Copyright (c)      2010 Bryce Lelbach
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #if !defined(SPIRIT_KARMA_AS_DEC_18_0510PM)
Chris@16: #define SPIRIT_KARMA_AS_DEC_18_0510PM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/home/karma/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/karma/generator.hpp>
Chris@16: #include <boost/spirit/home/karma/domain.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/output_iterator.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/as.hpp>
Chris@16: #include <boost/spirit/home/support/unused.hpp>
Chris@16: #include <boost/spirit/home/support/info.hpp>
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/spirit/home/support/has_semantic_action.hpp>
Chris@16: #include <boost/spirit/home/support/handles_container.hpp>
Chris@16: #include <boost/spirit/home/support/assert_msg.hpp>
Chris@16: #include <boost/spirit/home/support/container.hpp>
Chris@16: #include <boost/spirit/home/karma/detail/attributes.hpp>
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace karma
Chris@16: {
Chris@16:     template <typename T>
Chris@16:     struct as
Chris@16:       : stateful_tag_type<T, tag::as>
Chris@16:     {
Chris@16:         BOOST_SPIRIT_ASSERT_MSG(
Chris@16:             (traits::is_container<T>::type::value),
Chris@16:             error_type_must_be_a_container,
Chris@16:             (T));
Chris@16:     };
Chris@16: }}}
Chris@16: 
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Enablers
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // enables as_string[...]
Chris@16:     template <>
Chris@16:     struct use_directive<karma::domain, tag::as_string> 
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables as_wstring[...]
Chris@16:     template <>
Chris@16:     struct use_directive<karma::domain, tag::as_wstring> 
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables as<T>[...]
Chris@16:     template <typename T>
Chris@16:     struct use_directive<karma::domain, tag::stateful_tag<T, tag::as> > 
Chris@16:       : mpl::true_ 
Chris@16:     {};
Chris@16: }}
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace karma
Chris@16: {
Chris@16: #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
Chris@16:     using spirit::as_string;
Chris@16:     using spirit::as_wstring;
Chris@16: #endif
Chris@16:     using spirit::as_string_type;
Chris@16:     using spirit::as_wstring_type;
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // as_directive allows to hook custom conversions to string into the
Chris@16:     // output generation process
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename T>
Chris@16:     struct as_directive 
Chris@16:       : unary_generator<as_directive<Subject, T> >
Chris@16:     {
Chris@16:         typedef Subject subject_type;
Chris@16:         typedef typename subject_type::properties properties;
Chris@16: 
Chris@16:         as_directive(Subject const& subject)
Chris@16:           : subject(subject) {}
Chris@16: 
Chris@16:         template <typename Context, typename Iterator>
Chris@16:         struct attribute
Chris@16:         {
Chris@16:             typedef T type;
Chris@16:         };
Chris@16: 
Chris@16:         template <typename OutputIterator, typename Context, typename Delimiter
Chris@16:           , typename Attribute>
Chris@16:         bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
Chris@16:           , Attribute const& attr) const
Chris@16:         {
Chris@16:             if (!traits::valid_as<T>(attr))
Chris@16:                 return false;
Chris@16: 
Chris@16:             return subject.generate(sink, ctx, d, traits::as<T>(attr)) &&
Chris@16:                     karma::delimit_out(sink, d); // always do post-delimiting
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         info what(Context& context) const
Chris@16:         {
Chris@16:             return info("as", subject.what(context));
Chris@16:         }
Chris@16: 
Chris@16:         Subject subject;
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Generator generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename Modifiers>
Chris@16:     struct make_directive<tag::as_string, Subject, Modifiers>
Chris@16:     {
Chris@16:         typedef as_directive<Subject, std::string> result_type;
Chris@16:         result_type operator()(unused_type, Subject const& subject
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return result_type(subject);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename Subject, typename Modifiers>
Chris@16:     struct make_directive<tag::as_wstring, Subject, Modifiers>
Chris@16:     {
Chris@16:         typedef as_directive<Subject, std::basic_string<wchar_t> > result_type;
Chris@16:         result_type operator()(unused_type, Subject const& subject
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return result_type(subject);
Chris@16:         }
Chris@16:     };
Chris@16:     
Chris@16:     template <typename T, typename Subject, typename Modifiers>
Chris@16:     struct make_directive<tag::stateful_tag<T, tag::as>, Subject, Modifiers>
Chris@16:     {
Chris@16:         typedef as_directive<Subject, T> result_type;
Chris@16:         result_type operator()(unused_type, Subject const& subject
Chris@16:           , unused_type) const
Chris@16:         {
Chris@16:             return result_type(subject);
Chris@16:         }
Chris@16:     };
Chris@16: }}}
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace traits
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename T>
Chris@16:     struct has_semantic_action<karma::as_directive<Subject, T> >
Chris@16:       : unary_has_semantic_action<Subject> {};
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Subject, typename T, typename Attribute
Chris@16:       , typename Context, typename Iterator>
Chris@16:     struct handles_container<karma::as_directive<Subject, T>, Attribute
Chris@16:       , Context, Iterator>
Chris@16:       : mpl::false_ {};   // always dereference attribute if used in sequences
Chris@16: }}}
Chris@16: 
Chris@16: #endif