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+// Copyright (c) 2001-2011 Hartmut Kaiser
+// Copyright (c) 2001-2011 Joel de Guzman
+// Copyright (c) 2010 Bryce Lelbach
+// Copyright (c) 2011 Thomas Heller
+//
+// 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_ARGUMENT_JUNE_07_2009_1106AM)
+#define BOOST_SPIRIT_LEX_ARGUMENT_JUNE_07_2009_1106AM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/include/phoenix_core.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>
+#include <boost/spirit/home/support/string_traits.hpp>
+#include <boost/spirit/home/lex/argument_phoenix.hpp>
+#include <boost/fusion/include/at.hpp>
+#include <boost/mpl/at.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit { namespace lex
+{
+ ///////////////////////////////////////////////////////////////////////////
+ // The state_getter is a Phoenix actor used to access the name of the
+ // current lexer state by calling get_state_name() on the context (which
+ // is the 5th parameter to any lexer semantic actions).
+ //
+ // This Phoenix actor is invoked whenever the placeholder '_state' is used
+ // as a rvalue inside a lexer semantic action:
+ //
+ // lex::token_def<> identifier = "[a-zA-Z_][a-zA-Z0-9_]*";
+ // this->self = identifier [ std::cout << _state ];
+ //
+ // The example shows how to print the lexer state after matching a token
+ // 'identifier'.
+ struct state_getter
+ {
+ typedef mpl::true_ no_nullary;
+
+ template <typename Env>
+ struct result
+ {
+ typedef
+ typename remove_reference<
+ typename remove_const<
+ typename mpl::at_c<typename Env::args_type, 4>::type
+ >::type
+ >::type
+ context_type;
+
+ typedef typename context_type::state_name_type type;
+ };
+
+ template <typename Env>
+ typename result<Env>::type
+ eval(Env const& env) const
+ {
+ return fusion::at_c<4>(env.args()).get_state_name();
+ }
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The state_setter is a Phoenix actor used to change the name of the
+ // current lexer state by calling set_state_name() on the context (which
+ // is the 5th parameter to any lexer semantic actions).
+ //
+ // This Phoenix actor is invoked whenever the placeholder '_state' is used
+ // as a lvalue inside a lexer semantic action:
+ //
+ // lex::token_def<> identifier = "[a-zA-Z_][a-zA-Z0-9_]*";
+ // this->self = identifier [ _state = "SOME_LEXER_STATE" ];
+ //
+ // The example shows how to change the lexer state after matching a token
+ // 'identifier'.
+ template <typename Actor>
+ struct state_setter
+ {
+ typedef mpl::true_ no_nullary;
+
+ template <typename Env>
+ struct result
+ {
+ typedef void type;
+ };
+
+ template <typename Env>
+ void eval(Env const& env) const
+ {
+ typedef
+ typename remove_reference<
+ typename remove_const<
+ typename mpl::at_c<typename Env::args_type, 4>::type
+ >::type
+ >::type
+ context_type;
+
+ typedef typename context_type::state_name_type string;
+
+ fusion::at_c<4>(env.args()).set_state_name(
+ traits::get_c_string(actor_.eval(env)));
+ }
+
+ state_setter(Actor const& actor)
+ : actor_(actor) {}
+
+ // see explanation for this constructor at the end of this file
+#ifndef BOOST_SPIRIT_USE_PHOENIX_V3
+ state_setter(phoenix::actor<state_getter>, Actor const& actor)
+ : actor_(actor) {}
+#endif
+
+ Actor actor_;
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The value_getter is used to create the _val placeholder, which is a
+ // Phoenix actor used to access the value of the current token.
+ //
+ // This Phoenix actor is invoked whenever the placeholder '_val' is used
+ // as a rvalue inside a lexer semantic action:
+ //
+ // lex::token_def<> identifier = "[a-zA-Z_][a-zA-Z0-9_]*";
+ // this->self = identifier [ std::cout << _val ];
+ //
+ // The example shows how to use _val to print the identifier name (which
+ // is the initial token value).
+ struct value_getter
+ {
+ typedef mpl::true_ no_nullary;
+
+ template <typename Env>
+ struct result
+ {
+ typedef
+ typename remove_reference<
+ typename remove_const<
+ typename mpl::at_c<typename Env::args_type, 4>::type
+ >::type
+ >::type
+ context_type;
+
+ typedef typename context_type::get_value_type type;
+ };
+
+ template <typename Env>
+ typename result<Env>::type
+ eval(Env const& env) const
+ {
+ return fusion::at_c<4>(env.args()).get_value();
+ }
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The value_setter is a Phoenix actor used to change the name of the
+ // current lexer state by calling set_state_name() on the context (which
+ // is the 5th parameter to any lexer semantic actions).
+ //
+ // This Phoenix actor is invoked whenever the placeholder '_val' is used
+ // as a lvalue inside a lexer semantic action:
+ //
+ // lex::token_def<> identifier = "[a-zA-Z_][a-zA-Z0-9_]*";
+ // this->self = identifier [ _val = "identifier" ];
+ //
+ // The example shows how to change the token value after matching a token
+ // 'identifier'.
+ template <typename Actor>
+ struct value_setter
+ {
+ typedef mpl::true_ no_nullary;
+
+ template <typename Env>
+ struct result
+ {
+ typedef void type;
+ };
+
+ template <typename Env>
+ void eval(Env const& env) const
+ {
+ fusion::at_c<4>(env.args()).set_value(actor_.eval(env));
+ }
+
+ value_setter(Actor const& actor)
+ : actor_(actor) {}
+
+#ifndef BOOST_SPIRIT_USE_PHOENIX_V3
+ // see explanation for this constructor at the end of this file
+ value_setter(phoenix::actor<value_getter>, Actor const& actor)
+ : actor_(actor) {}
+#endif
+
+ Actor actor_;
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The eoi_getter is used to create the _eoi placeholder, which is a
+ // Phoenix actor used to access the end of input iterator pointing to the
+ // end of the underlying input sequence.
+ //
+ // This actor is invoked whenever the placeholder '_eoi' is used in a
+ // lexer semantic action:
+ //
+ // lex::token_def<> identifier = "[a-zA-Z_][a-zA-Z0-9_]*";
+ // this->self = identifier
+ // [ std::cout << construct_<std::string>(_end, _eoi) ];
+ //
+ // The example shows how to use _eoi to print all remaining input after
+ // matching a token 'identifier'.
+ struct eoi_getter
+ {
+ typedef mpl::true_ no_nullary;
+
+ template <typename Env>
+ struct result
+ {
+ typedef
+ typename remove_reference<
+ typename remove_const<
+ typename mpl::at_c<typename Env::args_type, 4>::type
+ >::type
+ >::type
+ context_type;
+
+ typedef typename context_type::base_iterator_type const& type;
+ };
+
+ template <typename Env>
+ typename result<Env>::type
+ eval(Env const& env) const
+ {
+ return fusion::at_c<4>(env.args()).get_eoi();
+ }
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // '_start' and '_end' may be used to access the start and the end of
+ // the matched sequence of the current token
+ typedef phoenix::arg_names::_1_type _start_type;
+ typedef phoenix::arg_names::_2_type _end_type;
+#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+ _start_type const _start = _start_type();
+ _end_type const _end = _end_type();
+#endif
+
+ // We are reusing the placeholder '_pass' to access and change the pass
+ // status of the current match (see support/argument.hpp for its
+ // definition).
+ // typedef phoenix::arg_names::_3_type _pass_type;
+ using boost::spirit::_pass_type;
+#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+ using boost::spirit::_pass;
+#endif
+
+ // '_tokenid' may be used to access and change the tokenid of the current
+ // token
+ typedef phoenix::arg_names::_4_type _tokenid_type;
+#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+ _tokenid_type const _tokenid = _tokenid_type();
+#endif
+
+ typedef phoenix::actor<value_context> _val_type;
+ typedef phoenix::actor<state_context> _state_type;
+ typedef phoenix::actor<eoi_getter> _eoi_type;
+#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+ // '_val' may be used to access and change the token value of the current
+ // token
+ _val_type const _val = _val_type();
+ // _state may be used to access and change the name of the current lexer
+ // state
+ _state_type const _state = _state_type();
+ // '_eoi' may be used to access the end of input iterator of the input
+ // stream used by the lexer to match tokens from
+ _eoi_type const _eoi = _eoi_type();
+#endif
+}}}
+
+///////////////////////////////////////////////////////////////////////////////
+#ifndef BOOST_SPIRIT_USE_PHOENIX_V3
+namespace boost { namespace phoenix
+{
+ ///////////////////////////////////////////////////////////////////////////
+ // The specialization of as_actor_base<> below is needed to convert all
+ // occurrences of _state in places where it's used as a rvalue into the
+ // proper Phoenix actor (spirit::state_getter) accessing the lexer state.
+ template<>
+ struct as_actor_base<actor<spirit::lex::state_context> >
+ {
+ typedef spirit::lex::state_getter type;
+
+ static spirit::lex::state_getter
+ convert(actor<spirit::lex::state_context>)
+ {
+ return spirit::lex::state_getter();
+ }
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The specialization of as_composite<> below is needed to convert all
+ // assignments to _state (places where it's used as a lvalue) into the
+ // proper Phoenix actor (spirit::state_setter) allowing to change the
+ // lexer state.
+ template <typename RHS>
+ struct as_composite<assign_eval, actor<spirit::lex::state_context>, RHS>
+ {
+ // For an assignment to _state (a spirit::state_context actor), this
+ // specialization makes Phoenix's compose() function construct a
+ // spirit::state_setter actor from 1. the LHS, a spirit::state_getter
+ // actor (due to the specialization of as_actor_base<> above),
+ // and 2. the RHS actor.
+ // This is why spirit::state_setter needs a constructor which takes
+ // a dummy spirit::state_getter as its first argument in addition
+ // to its real, second argument (the RHS actor).
+ typedef spirit::lex::state_setter<typename as_actor<RHS>::type> type;
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The specialization of as_actor_base<> below is needed to convert all
+ // occurrences of _val in places where it's used as a rvalue into the
+ // proper Phoenix actor (spirit::value_getter) accessing the token value.
+ template<>
+ struct as_actor_base<actor<spirit::lex::value_context> >
+ {
+ typedef spirit::lex::value_getter type;
+
+ static spirit::lex::value_getter
+ convert(actor<spirit::lex::value_context>)
+ {
+ return spirit::lex::value_getter();
+ }
+ };
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The specialization of as_composite<> below is needed to convert all
+ // assignments to _val (places where it's used as a lvalue) into the
+ // proper Phoenix actor (spirit::value_setter) allowing to change the
+ // token value.
+ template <typename RHS>
+ struct as_composite<assign_eval, actor<spirit::lex::value_context>, RHS>
+ {
+ // For an assignment to _val (a spirit::value_context actor), this
+ // specialization makes Phoenix's compose() function construct a
+ // spirit::value_setter actor from 1. the LHS, a spirit::value_getter
+ // actor (due to the specialization of as_actor_base<> above),
+ // and 2. the RHS actor.
+ // This is why spirit::value_setter needs a constructor which takes
+ // a dummy spirit::value_getter as its first argument in addition
+ // to its real, second argument (the RHS actor).
+ typedef spirit::lex::value_setter<typename as_actor<RHS>::type> type;
+ };
+}}
+#endif
+
+#undef SPIRIT_DECLARE_ARG
+#endif
+