142 lines
4.7 KiB
C++
142 lines
4.7 KiB
C++
// 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_MASK_JUN_03_2011_0929PM)
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#define BOOST_SPIRIT_LEX_PLAIN_TOKENID_MASK_JUN_03_2011_0929PM
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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/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/range/iterator_range_core.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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#include <iterator> // for std::iterator_traits
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#include <sstream>
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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_mask(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_mask, fusion::vector1<A0> >
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> : mpl::or_<is_integral<A0>, is_enum<A0> > {};
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// enables *lazy* tokenid_mask(id)
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template <>
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struct use_lazy_terminal<
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qi::domain, tag::tokenid_mask, 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_mask;
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#endif
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using spirit::tokenid_mask_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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// Additionally it applies the given mask to the matched token id.
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template <typename Mask>
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struct plain_tokenid_mask
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: primitive_parser<plain_tokenid_mask<Mask> >
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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 Mask type;
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};
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plain_tokenid_mask(Mask const& mask)
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: mask(mask) {}
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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 mask this component has
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// been initialized with
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typedef typename
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std::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 ((t.id() & mask) == id_type(mask))
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{
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spirit::traits::assign_to(t.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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std::stringstream ss;
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ss << "tokenid_mask(" << mask << ")";
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return info("tokenid_mask", ss.str());
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}
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Mask mask;
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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, typename Mask>
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struct make_primitive<terminal_ex<tag::tokenid_mask, fusion::vector1<Mask> >
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, Modifiers>
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{
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typedef plain_tokenid_mask<Mask> 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 Mask, typename Attr, typename Context, typename Iterator>
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struct handles_container<qi::plain_tokenid_mask<Mask>, 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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