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