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109 lines
3.7 KiB
109 lines
3.7 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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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_HOLD_FEBRUARY_6_2010_0917AM) |
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#define SPIRIT_HOLD_FEBRUARY_6_2010_0917AM |
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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/support/attributes.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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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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template <> |
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struct use_directive<qi::domain, tag::hold> // enables hold |
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: mpl::true_ {}; |
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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::hold; |
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#endif |
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using spirit::hold_type; |
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template <typename Subject> |
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struct hold_directive : unary_parser<hold_directive<Subject> > |
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{ |
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typedef Subject subject_type; |
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hold_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 typename |
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traits::attribute_of<subject_type, Context, Iterator>::type |
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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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Attribute copy(attr); |
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if (subject.parse(first, last, context, skipper, copy)) |
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{ |
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traits::swap_impl(copy, attr); |
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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("hold", 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::hold, Subject, Modifiers> |
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{ |
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typedef hold_directive<Subject> result_type; |
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result_type operator()(unused_type, Subject const& subject, 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> |
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struct has_semantic_action<qi::hold_directive<Subject> > |
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: unary_has_semantic_action<Subject> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Subject, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<qi::hold_directive<Subject>, Attribute |
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, Context, Iterator> |
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: unary_handles_container<Subject, Attribute, Context, Iterator> {}; |
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}}} |
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#endif
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