Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
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_AS_DECEMBER_6_2010_1013AM)
Chris@16: #define SPIRIT_AS_DECEMBER_6_2010_1013AM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/home/qi/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/qi/skip_over.hpp>
Chris@16: #include <boost/spirit/home/qi/parser.hpp>
Chris@16: #include <boost/spirit/home/qi/detail/assign_to.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/unused.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/range/iterator_range.hpp>
Chris@16: #include <string>
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace qi
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<qi::domain, tag::as_string>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     // enables as_wstring[...]
Chris@16:     template <>
Chris@16:     struct use_directive<qi::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<qi::domain, tag::stateful_tag<T, tag::as> >
Chris@16:       : mpl::true_
Chris@16:     {};
Chris@16: }}
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace qi
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:     template <typename Subject, typename T>
Chris@16:     struct as_directive : unary_parser<as_directive<Subject, T> >
Chris@16:     {
Chris@16:         typedef Subject subject_type;
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 Iterator, typename Context
Chris@16:           , typename Skipper, typename Attribute>
Chris@16:         bool parse(Iterator& first, Iterator const& last
Chris@16:           , Context& context, Skipper const& skipper, Attribute& attr_) const
Chris@16:         {
Chris@16:             Iterator i = first;
Chris@16:             T as_attr;
Chris@16:             if (subject.parse(i, last, context, skipper, as_attr))
Chris@16:             {
Chris@16:                 spirit::traits::assign_to(as_attr, attr_);
Chris@16:                 first = i;
Chris@16:                 return true;
Chris@16:             }
Chris@16:             return false;
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Iterator, typename Context, typename Skipper>
Chris@16:         bool parse(Iterator& first, Iterator const& last
Chris@16:           , Context& context, Skipper const& skipper, T& attr_) const
Chris@16:         {
Chris@16:             Iterator i = first;
Chris@16:             if (subject.parse(i, last, context, skipper, attr_))
Chris@16:             {
Chris@16:                 first = i;
Chris@16:                 return true;
Chris@16:             }
Chris@16:             return false;
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:     // Parser 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<qi::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<qi::as_directive<Subject, T>, Attribute
Chris@16:         , Context, Iterator>
Chris@16:       : mpl::false_ {};
Chris@16: }}}
Chris@16: 
Chris@16: #endif