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150 lines
4.8 KiB
150 lines
4.8 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
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// |
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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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#if !defined(BOOST_SPIRIT_LEX_PLAIN_TOKENID_NOV_26_2010_0944AM) |
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#define BOOST_SPIRIT_LEX_PLAIN_TOKENID_NOV_26_2010_0944AM |
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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/support/info.hpp> |
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#include <boost/spirit/home/qi/detail/attributes.hpp> |
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#include <boost/spirit/home/support/common_terminals.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/spirit/home/qi/skip_over.hpp> |
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#include <boost/spirit/home/qi/domain.hpp> |
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#include <boost/spirit/home/qi/parser.hpp> |
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#include <boost/spirit/home/qi/meta_compiler.hpp> |
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#include <boost/spirit/home/qi/detail/assign_to.hpp> |
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#include <boost/range/iterator_range.hpp> |
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#include <boost/fusion/include/vector.hpp> |
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#include <boost/fusion/include/at.hpp> |
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#include <boost/mpl/or.hpp> |
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#include <boost/type_traits/is_integral.hpp> |
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#include <boost/type_traits/is_enum.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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// enables tokenid |
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template <> |
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struct use_terminal<qi::domain, tag::tokenid> |
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: mpl::true_ {}; |
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// enables tokenid(id) |
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template <typename A0> |
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struct use_terminal<qi::domain |
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, terminal_ex<tag::tokenid, fusion::vector1<A0> > |
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> : mpl::or_<is_integral<A0>, is_enum<A0> > {}; |
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// enables *lazy* tokenid(id) |
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template <> |
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struct use_lazy_terminal< |
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qi::domain, tag::tokenid, 1 |
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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::tokenid; |
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#endif |
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using spirit::tokenid_type; |
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/////////////////////////////////////////////////////////////////////////// |
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// The plain_tokenid represents a simple token defined by the lexer inside |
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// a Qi grammar. The difference to plain_token is that it exposes the |
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// matched token id instead of the iterator_range of the matched input. |
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template <typename TokenId> |
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struct plain_tokenid |
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: primitive_parser<plain_tokenid<TokenId> > |
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{ |
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template <typename Context, typename Iterator> |
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struct attribute |
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{ |
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typedef TokenId type; |
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}; |
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plain_tokenid(TokenId const& id) |
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: id(id) {} |
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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 |
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, Attribute& attr) const |
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{ |
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qi::skip_over(first, last, skipper); // always do a pre-skip |
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if (first != last) { |
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// simply match the token id with the id this component has |
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// been initialized with |
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typedef typename |
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boost::detail::iterator_traits<Iterator>::value_type |
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token_type; |
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typedef typename token_type::id_type id_type; |
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token_type const& t = *first; |
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if (std::size_t(~0) == id || id_type(id) == t.id()) { |
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spirit::traits::assign_to(id, attr); |
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++first; |
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return true; |
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} |
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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("tokenid"); |
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} |
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TokenId id; |
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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 Modifiers> |
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struct make_primitive<tag::tokenid, Modifiers> |
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{ |
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typedef plain_tokenid<std::size_t> result_type; |
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result_type operator()(unused_type, unused_type) const |
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{ |
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return result_type(std::size_t(~0)); |
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} |
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}; |
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template <typename Modifiers, typename TokenId> |
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struct make_primitive<terminal_ex<tag::tokenid, fusion::vector1<TokenId> > |
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, Modifiers> |
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{ |
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typedef plain_tokenid<TokenId> result_type; |
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template <typename Terminal> |
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result_type operator()(Terminal const& term, unused_type) const |
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{ |
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return result_type(fusion::at_c<0>(term.args)); |
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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 Idtype, typename Attr, typename Context, typename Iterator> |
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struct handles_container<qi::plain_tokenid<Idtype>, Attr, Context, Iterator> |
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: mpl::true_ |
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{}; |
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}}} |
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#endif
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