ceph/src/boost/libs/spirit/include/boost/spirit/home/lex/lexer/action.hpp

   1 //  Copyright (c) 2001-2011 Hartmut Kaiser
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #if !defined(SPIRIT_LEX_ACTION_NOV_18_2007_0743PM)
   7 #define SPIRIT_LEX_ACTION_NOV_18_2007_0743PM
   8
   9 #if defined(_MSC_VER)
  10 #pragma once
  11 #endif
  12
  13 #include <boost/spirit/home/lex/meta_compiler.hpp>
  14 #include <boost/spirit/home/lex/lexer_type.hpp>
  15 #include <boost/spirit/home/lex/argument.hpp>
  16 #include <boost/spirit/home/lex/lexer/support_functions.hpp>
  17 #include <boost/mpl/if.hpp>
  18 #include <boost/type_traits/remove_const.hpp>
  19 #include <boost/type_traits/is_same.hpp>
  20
  21 ///////////////////////////////////////////////////////////////////////////////
  22 namespace boost { namespace spirit { namespace lex
  23 {
  24     ///////////////////////////////////////////////////////////////////////////
  25     template <typename Subject, typename Action>
  26     struct action : unary_lexer<action<Subject, Action> >
  27     {
  28         action(Subject const& subject, Action f)
  29           : subject(subject), f(f) {}
  30
  31         template <typename LexerDef, typename String>
  32         void collect(LexerDef& lexdef, String const& state
  33           , String const& targetstate) const
  34         {
  35             // collect the token definition information for the token_def
  36             // this action is attached to
  37             subject.collect(lexdef, state, targetstate);
  38         }
  39
  40         template <typename LexerDef>
  41         void add_actions(LexerDef& lexdef) const
  42         {
  43             // call to add all actions attached further down the hierarchy
  44             subject.add_actions(lexdef);
  45
  46             // retrieve the id of the associated token_def and register the
  47             // given semantic action with the lexer instance
  48             lexdef.add_action(subject.unique_id(), subject.state(), f);
  49         }
  50
  51         Subject subject;
  52         Action f;
  53
  54     private:
  55         // silence MSVC warning C4512: assignment operator could not be generated
  56         action& operator= (action const&);
  57     };
  58
  59 }}}
  60
  61 ///////////////////////////////////////////////////////////////////////////////
  62 namespace boost { namespace spirit
  63 {
  64     ///////////////////////////////////////////////////////////////////////////
  65     // Karma action meta-compiler
  66     template <>
  67     struct make_component<lex::domain, tag::action>
  68     {
  69         template <typename Sig>
  70         struct result;
  71
  72         template <typename This, typename Elements, typename Modifiers>
  73         struct result<This(Elements, Modifiers)>
  74         {
  75             typedef typename
  76                 remove_const<typename Elements::car_type>::type
  77             subject_type;
  78
  79             typedef typename
  80                 remove_const<typename Elements::cdr_type::car_type>::type
  81             action_type;
  82
  83             typedef lex::action<subject_type, action_type> type;
  84         };
  85
  86         template <typename Elements>
  87         typename result<make_component(Elements, unused_type)>::type
  88         operator()(Elements const& elements, unused_type) const
  89         {
  90             typename result<make_component(Elements, unused_type)>::type
  91                 result(elements.car, elements.cdr.car);
  92             return result;
  93         }
  94     };
  95 }}
  96
  97 #endif