374 lines
12 KiB
Plaintext
374 lines
12 KiB
Plaintext
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/*=============================================================================
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Copyright (c) 2001-2003 Joel de Guzman
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Copyright (c) 2002-2003 Martin Wille
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Copyright (c) 2003 Hartmut Kaiser
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http://spirit.sourceforge.net/
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Use, modification and distribution is subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined BOOST_SPIRIT_GRAMMAR_IPP
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#define BOOST_SPIRIT_GRAMMAR_IPP
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#if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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#include <boost/spirit/home/classic/core/non_terminal/impl/object_with_id.ipp>
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#include <algorithm>
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#include <functional>
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#include <memory> // for std::auto_ptr
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#include <boost/weak_ptr.hpp>
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#endif
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#ifdef BOOST_SPIRIT_THREADSAFE
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#include <boost/spirit/home/classic/core/non_terminal/impl/static.hpp>
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#include <boost/thread/tss.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/lock_types.hpp>
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#endif
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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template <typename DerivedT, typename ContextT>
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struct grammar;
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//////////////////////////////////
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template <typename GrammarT, typename ScannerT>
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struct grammar_definition
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{
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typedef typename GrammarT::template definition<ScannerT> type;
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};
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namespace impl
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{
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#if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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struct grammar_tag {};
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//////////////////////////////////
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template <typename GrammarT>
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struct grammar_helper_base
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{
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virtual int undefine(GrammarT *) = 0;
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virtual ~grammar_helper_base() {}
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};
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//////////////////////////////////
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template <typename GrammarT>
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struct grammar_helper_list
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{
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typedef GrammarT grammar_t;
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typedef grammar_helper_base<GrammarT> helper_t;
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typedef std::vector<helper_t*> vector_t;
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grammar_helper_list() {}
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grammar_helper_list(grammar_helper_list const& /*x*/)
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{ // Does _not_ copy the helpers member !
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}
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grammar_helper_list& operator=(grammar_helper_list const& x)
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{ // Does _not_ copy the helpers member !
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return *this;
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}
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void push_back(helper_t *helper)
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{ helpers.push_back(helper); }
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void pop_back()
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{ helpers.pop_back(); }
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typename vector_t::size_type
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size() const
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{ return helpers.size(); }
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typename vector_t::reverse_iterator
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rbegin()
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{ return helpers.rbegin(); }
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typename vector_t::reverse_iterator
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rend()
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{ return helpers.rend(); }
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#ifdef BOOST_SPIRIT_THREADSAFE
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boost::mutex & mutex()
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{ return m; }
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#endif
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private:
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vector_t helpers;
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#ifdef BOOST_SPIRIT_THREADSAFE
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boost::mutex m;
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#endif
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};
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//////////////////////////////////
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struct grammartract_helper_list;
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#if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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struct grammartract_helper_list
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{
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template<typename GrammarT>
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static grammar_helper_list<GrammarT>&
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do_(GrammarT const* g)
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{
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return g->helpers;
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}
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};
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#endif
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//////////////////////////////////
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template <typename GrammarT, typename DerivedT, typename ScannerT>
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struct grammar_helper : private grammar_helper_base<GrammarT>
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{
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typedef GrammarT grammar_t;
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typedef ScannerT scanner_t;
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typedef DerivedT derived_t;
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typedef typename grammar_definition<DerivedT, ScannerT>::type definition_t;
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typedef grammar_helper<grammar_t, derived_t, scanner_t> helper_t;
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typedef boost::shared_ptr<helper_t> helper_ptr_t;
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typedef boost::weak_ptr<helper_t> helper_weak_ptr_t;
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grammar_helper*
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this_() { return this; }
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grammar_helper(helper_weak_ptr_t& p)
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: definitions_cnt(0)
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, self(this_())
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{ p = self; }
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definition_t&
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define(grammar_t const* target_grammar)
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{
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grammar_helper_list<GrammarT> &helpers =
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grammartract_helper_list::do_(target_grammar);
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typename grammar_t::object_id id = target_grammar->get_object_id();
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if (definitions.size()<=id)
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definitions.resize(id*3/2+1);
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if (definitions[id]!=0)
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return *definitions[id];
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std::auto_ptr<definition_t>
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result(new definition_t(target_grammar->derived()));
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#ifdef BOOST_SPIRIT_THREADSAFE
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boost::unique_lock<boost::mutex> lock(helpers.mutex());
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#endif
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helpers.push_back(this);
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++definitions_cnt;
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definitions[id] = result.get();
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return *(result.release());
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}
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int
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undefine(grammar_t* target_grammar)
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{
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typename grammar_t::object_id id = target_grammar->get_object_id();
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if (definitions.size()<=id)
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return 0;
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delete definitions[id];
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definitions[id] = 0;
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if (--definitions_cnt==0)
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self.reset();
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return 0;
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}
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private:
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std::vector<definition_t*> definitions;
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unsigned long definitions_cnt;
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helper_ptr_t self;
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};
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#endif /* defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE) */
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#ifdef BOOST_SPIRIT_THREADSAFE
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class get_definition_static_data_tag
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{
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template<typename DerivedT, typename ContextT, typename ScannerT>
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friend typename DerivedT::template definition<ScannerT> &
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get_definition(grammar<DerivedT, ContextT> const* self);
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get_definition_static_data_tag() {}
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};
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#endif
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template<typename DerivedT, typename ContextT, typename ScannerT>
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inline typename DerivedT::template definition<ScannerT> &
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get_definition(grammar<DerivedT, ContextT> const* self)
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{
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#if defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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typedef typename DerivedT::template definition<ScannerT> definition_t;
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static definition_t def(self->derived());
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return def;
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#else
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typedef grammar<DerivedT, ContextT> self_t;
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typedef impl::grammar_helper<self_t, DerivedT, ScannerT> helper_t;
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typedef typename helper_t::helper_weak_ptr_t ptr_t;
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# ifdef BOOST_SPIRIT_THREADSAFE
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boost::thread_specific_ptr<ptr_t> & tld_helper
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= static_<boost::thread_specific_ptr<ptr_t>,
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get_definition_static_data_tag>(get_definition_static_data_tag());
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if (!tld_helper.get())
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tld_helper.reset(new ptr_t);
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ptr_t &helper = *tld_helper;
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# else
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static ptr_t helper;
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# endif
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if (helper.expired())
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new helper_t(helper);
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return helper.lock()->define(self);
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#endif
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}
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template <int N>
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struct call_helper {
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template <typename RT, typename DefinitionT, typename ScannerT>
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static void
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do_ (RT &result, DefinitionT &def, ScannerT const &scan)
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{
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result = def.template get_start_parser<N>()->parse(scan);
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}
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};
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template <>
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struct call_helper<0> {
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template <typename RT, typename DefinitionT, typename ScannerT>
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static void
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do_ (RT &result, DefinitionT &def, ScannerT const &scan)
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{
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result = def.start().parse(scan);
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}
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};
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//////////////////////////////////
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template<int N, typename DerivedT, typename ContextT, typename ScannerT>
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inline typename parser_result<grammar<DerivedT, ContextT>, ScannerT>::type
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grammar_parser_parse(
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grammar<DerivedT, ContextT> const* self,
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ScannerT const &scan)
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{
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typedef
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typename parser_result<grammar<DerivedT, ContextT>, ScannerT>::type
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result_t;
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typedef typename DerivedT::template definition<ScannerT> definition_t;
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result_t result;
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definition_t &def = get_definition<DerivedT, ContextT, ScannerT>(self);
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call_helper<N>::do_(result, def, scan);
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return result;
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}
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//////////////////////////////////
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template<typename GrammarT>
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inline void
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grammar_destruct(GrammarT* self)
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{
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#if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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typedef grammar_helper_list<GrammarT> helper_list_t;
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helper_list_t& helpers =
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grammartract_helper_list::do_(self);
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# if defined(BOOST_INTEL_CXX_VERSION)
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typedef typename helper_list_t::vector_t::reverse_iterator iterator_t;
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for (iterator_t i = helpers.rbegin(); i != helpers.rend(); ++i)
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(*i)->undefine(self);
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# else
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typedef impl::grammar_helper_base<GrammarT> helper_base_t;
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std::for_each(helpers.rbegin(), helpers.rend(),
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std::bind2nd(std::mem_fun(&helper_base_t::undefine), self));
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# endif
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#else
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(void)self;
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#endif
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}
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///////////////////////////////////////////////////////////////////////////
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//
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// entry_grammar class
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//
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///////////////////////////////////////////////////////////////////////////
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template <typename DerivedT, int N, typename ContextT>
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class entry_grammar
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: public parser<entry_grammar<DerivedT, N, ContextT> >
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{
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public:
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typedef entry_grammar<DerivedT, N, ContextT> self_t;
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typedef self_t embed_t;
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typedef typename ContextT::context_linker_t context_t;
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typedef typename context_t::attr_t attr_t;
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template <typename ScannerT>
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struct result
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{
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typedef typename match_result<ScannerT, attr_t>::type type;
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};
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entry_grammar(DerivedT const &p) : target_grammar(p) {}
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template <typename ScannerT>
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typename parser_result<self_t, ScannerT>::type
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parse_main(ScannerT const& scan) const
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{ return impl::grammar_parser_parse<N>(&target_grammar, scan); }
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template <typename ScannerT>
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typename parser_result<self_t, ScannerT>::type
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parse(ScannerT const& scan) const
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{
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typedef typename parser_result<self_t, ScannerT>::type result_t;
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typedef parser_scanner_linker<ScannerT> scanner_t;
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BOOST_SPIRIT_CONTEXT_PARSE(scan, target_grammar, scanner_t,
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context_t, result_t)
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}
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private:
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DerivedT const &target_grammar;
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};
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} // namespace impl
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///////////////////////////////////////
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#if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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#define BOOST_SPIRIT_GRAMMAR_ID , public impl::object_with_id<impl::grammar_tag>
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#else
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#define BOOST_SPIRIT_GRAMMAR_ID
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#endif
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///////////////////////////////////////
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#if !defined(BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE)
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#define BOOST_SPIRIT_GRAMMAR_STATE \
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private: \
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friend struct impl::grammartract_helper_list; \
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mutable impl::grammar_helper_list<self_t> helpers;
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#else
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#define BOOST_SPIRIT_GRAMMAR_STATE
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#endif
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///////////////////////////////////////////////////////////////////////////////
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace boost::spirit
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#endif
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