comparison DEPENDENCIES/generic/include/boost/spirit/home/lex/lexer/token_def.hpp @ 16:2665513ce2d3

Add boost headers

+//  Copyright (c) 2001-2011 Hartmut Kaiser
+// 
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying 
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#if !defined(BOOST_SPIRIT_LEX_TOKEN_DEF_MAR_13_2007_0145PM)
+#define BOOST_SPIRIT_LEX_TOKEN_DEF_MAR_13_2007_0145PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/support/unused.hpp>
+#include <boost/spirit/home/support/argument.hpp>
+#include <boost/spirit/home/support/info.hpp>
+#include <boost/spirit/home/support/handles_container.hpp>
+#include <boost/spirit/home/qi/parser.hpp>
+#include <boost/spirit/home/qi/skip_over.hpp>
+#include <boost/spirit/home/qi/detail/construct.hpp>
+#include <boost/spirit/home/qi/detail/assign_to.hpp>
+#include <boost/spirit/home/lex/reference.hpp>
+#include <boost/spirit/home/lex/lexer_type.hpp>
+#include <boost/spirit/home/lex/lexer/terminals.hpp>
+
+#include <boost/fusion/include/vector.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/detail/iterator.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/variant.hpp>
+
+#include <string>
+#include <cstdlib>
+
+#if defined(BOOST_MSVC)
+# pragma warning(push)
+# pragma warning(disable: 4355) // 'this' : used in base member initializer list warning
+#endif
+
+namespace boost { namespace spirit { namespace lex
+{
+    ///////////////////////////////////////////////////////////////////////////
+    //  This component represents a token definition
+    ///////////////////////////////////////////////////////////////////////////
+    template<typename Attribute = unused_type
+      , typename Char = char
+      , typename Idtype = std::size_t>
+    struct token_def
+      : proto::extends<
+            typename proto::terminal<
+                lex::reference<token_def<Attribute, Char, Idtype> const, Idtype> 
+            >::type
+          , token_def<Attribute, Char, Idtype> >
+      , qi::parser<token_def<Attribute, Char, Idtype> >
+      , lex::lexer_type<token_def<Attribute, Char, Idtype> >
+    {
+    private:
+        // initialize proto base class
+        typedef lex::reference<token_def const, Idtype> reference_;
+        typedef typename proto::terminal<reference_>::type terminal_type;
+        typedef proto::extends<terminal_type, token_def> proto_base_type;
+
+        static std::size_t const all_states_id = static_cast<std::size_t>(-2);
+
+    public:
+        // Qi interface: meta-function calculating parser return type
+        template <typename Context, typename Iterator>
+        struct attribute
+        {
+            //  The return value of the token_def is either the specified 
+            //  attribute type, or the pair of iterators from the match of the 
+            //  corresponding token (if no attribute type has been specified),
+            //  or unused_type (if omit has been specified).
+            typedef typename Iterator::base_iterator_type iterator_type;
+            typedef typename mpl::if_<
+                traits::not_is_unused<Attribute>
+              , typename mpl::if_<
+                    is_same<Attribute, lex::omit>, unused_type, Attribute
+                >::type
+              , iterator_range<iterator_type>
+            >::type type;
+        };
+
+    public:
+        // Qi interface: parse functionality
+        template <typename Iterator, typename Context
+          , typename Skipper, typename Attribute_>
+        bool parse(Iterator& first, Iterator const& last
+          , Context& /*context*/, Skipper const& skipper
+          , Attribute_& attr) const
+        {
+            qi::skip_over(first, last, skipper);   // always do a pre-skip
+
+            if (first != last) {
+                typedef typename 
+                    boost::detail::iterator_traits<Iterator>::value_type 
+                token_type;
+
+                //  If the following assertion fires you probably forgot to  
+                //  associate this token definition with a lexer instance.
+                BOOST_ASSERT(std::size_t(~0) != token_state_);
+
+                token_type const& t = *first;
+                if (token_id_ == t.id() && 
+                    (all_states_id == token_state_ || token_state_ == t.state())) 
+                {
+                    spirit::traits::assign_to(t, attr);
+                    ++first;
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        template <typename Context>
+        info what(Context& /*context*/) const
+        {
+            if (0 == def_.which()) 
+                return info("token_def", boost::get<string_type>(def_));
+
+            return info("token_def", boost::get<char_type>(def_));
+        }
+
+        ///////////////////////////////////////////////////////////////////////
+        // Lex interface: collect token definitions and put it into the 
+        // provided lexer def
+        template <typename LexerDef, typename String>
+        void collect(LexerDef& lexdef, String const& state
+          , String const& targetstate) const
+        {
+            std::size_t state_id = lexdef.add_state(state.c_str());
+
+            // If the following assertion fires you are probably trying to use 
+            // a single token_def instance in more than one lexer state. This 
+            // is not possible. Please create a separate token_def instance 
+            // from the same regular expression for each lexer state it needs 
+            // to be associated with.
+            BOOST_ASSERT(
+                (std::size_t(~0) == token_state_ || state_id == token_state_) &&
+                "Can't use single token_def with more than one lexer state");
+
+            char_type const* target = targetstate.empty() ? 0 : targetstate.c_str();
+            if (target)
+                lexdef.add_state(target);
+
+            token_state_ = state_id;
+            if (0 == token_id_)
+                token_id_ = lexdef.get_next_id();
+
+            if (0 == def_.which()) {
+                unique_id_ = lexdef.add_token(state.c_str()
+                  , boost::get<string_type>(def_), token_id_, target);
+            }
+            else {
+                unique_id_ = lexdef.add_token(state.c_str()
+                  , boost::get<char_type>(def_), token_id_, target);
+            }
+        }
+
+        template <typename LexerDef>
+        void add_actions(LexerDef&) const {}
+
+    public:
+        typedef Char char_type;
+        typedef Idtype id_type;
+        typedef std::basic_string<char_type> string_type;
+
+        // Lex interface: constructing token definitions
+        token_def() 
+          : proto_base_type(terminal_type::make(reference_(*this)))
+          , def_('\0'), token_id_()
+          , unique_id_(std::size_t(~0)), token_state_(std::size_t(~0)) {}
+
+        token_def(token_def const& rhs) 
+          : proto_base_type(terminal_type::make(reference_(*this)))
+          , def_(rhs.def_), token_id_(rhs.token_id_)
+          , unique_id_(rhs.unique_id_), token_state_(rhs.token_state_) {}
+
+        explicit token_def(char_type def_, Idtype id_ = Idtype())
+          : proto_base_type(terminal_type::make(reference_(*this)))
+          , def_(def_)
+          , token_id_(Idtype() == id_ ? Idtype(def_) : id_)
+          , unique_id_(std::size_t(~0)), token_state_(std::size_t(~0)) {}
+
+        explicit token_def(string_type const& def_, Idtype id_ = Idtype())
+          : proto_base_type(terminal_type::make(reference_(*this)))
+          , def_(def_), token_id_(id_)
+          , unique_id_(std::size_t(~0)), token_state_(std::size_t(~0)) {}
+
+        template <typename String>
+        token_def& operator= (String const& definition)
+        {
+            def_ = definition;
+            token_id_ = Idtype();
+            unique_id_ = std::size_t(~0);
+            token_state_ = std::size_t(~0);
+            return *this;
+        }
+        token_def& operator= (token_def const& rhs)
+        {
+            def_ = rhs.def_;
+            token_id_ = rhs.token_id_;
+            unique_id_ = rhs.unique_id_;
+            token_state_ = rhs.token_state_;
+            return *this;
+        }
+
+        // general accessors 
+        Idtype const& id() const { return token_id_; }
+        void id(Idtype const& id) { token_id_ = id; }
+        std::size_t unique_id() const { return unique_id_; }
+
+        string_type definition() const 
+        { 
+            return (0 == def_.which()) ? 
+                boost::get<string_type>(def_) : 
+                string_type(1, boost::get<char_type>(def_));
+        }
+        std::size_t state() const { return token_state_; }
+
+    private:
+        variant<string_type, char_type> def_;
+        mutable Idtype token_id_;
+        mutable std::size_t unique_id_;
+        mutable std::size_t token_state_;
+    };
+}}}
+
+namespace boost { namespace spirit { namespace traits
+{
+    ///////////////////////////////////////////////////////////////////////////
+    template<typename Attribute, typename Char, typename Idtype
+      , typename Attr, typename Context, typename Iterator>
+    struct handles_container<
+            lex::token_def<Attribute, Char, Idtype>, Attr, Context, Iterator>
+      : traits::is_container<
+            typename attribute_of<
+                lex::token_def<Attribute, Char, Idtype>, Context, Iterator
+            >::type>
+    {};
+}}}
+
+#if defined(BOOST_MSVC)
+# pragma warning(pop)
+#endif
+
+#endif