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178 lines
5.7 KiB
178 lines
5.7 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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Copyright (c) 2001-2011 Hartmut Kaiser |
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Copyright (c) 2010 Bryce Lelbach |
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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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=============================================================================*/ |
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#if !defined(SPIRIT_AS_DECEMBER_6_2010_1013AM) |
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#define SPIRIT_AS_DECEMBER_6_2010_1013AM |
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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/qi/meta_compiler.hpp> |
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#include <boost/spirit/home/qi/skip_over.hpp> |
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#include <boost/spirit/home/qi/parser.hpp> |
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#include <boost/spirit/home/qi/detail/assign_to.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/unused.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/range/iterator_range.hpp> |
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#include <string> |
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namespace boost { namespace spirit { namespace qi |
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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<qi::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<qi::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<qi::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 qi |
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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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template <typename Subject, typename T> |
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struct as_directive : unary_parser<as_directive<Subject, T> > |
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{ |
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typedef Subject subject_type; |
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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 Iterator, typename Context |
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, typename Skipper, typename Attribute> |
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bool parse(Iterator& first, Iterator const& last |
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, Context& context, Skipper const& skipper, Attribute& attr) const |
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{ |
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Iterator i = first; |
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T as_attr; |
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if (subject.parse(i, last, context, skipper, as_attr)) |
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{ |
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spirit::traits::assign_to(as_attr, attr); |
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first = i; |
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return true; |
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} |
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return false; |
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} |
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template <typename Iterator, typename Context, typename Skipper> |
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bool parse(Iterator& first, Iterator const& last |
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, Context& context, Skipper const& skipper, T& attr) const |
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{ |
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Iterator i = first; |
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if (subject.parse(i, last, context, skipper, attr)) |
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{ |
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first = i; |
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return true; |
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} |
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return false; |
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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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// Parser 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<qi::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<qi::as_directive<Subject, T>, Attribute |
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, Context, Iterator> |
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: mpl::false_ {}; |
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}}} |
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#endif
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