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// 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_LEXER_SEMANTIC_ACTION_DATA_JUN_10_2009_0417PM)
#define BOOST_SPIRIT_LEX_LEXER_SEMANTIC_ACTION_DATA_JUN_10_2009_0417PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/lex/lexer/pass_flags.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/function.hpp>
#include <vector>
namespace boost { namespace spirit { namespace lex { namespace lexertl
{
namespace detail
{
///////////////////////////////////////////////////////////////////////
template <typename Iterator, typename SupportsState, typename Data>
struct semantic_actions;
// This specialization of semantic_actions will be used if the token
// type (lexer definition) does not support states, which simplifies
// the data structures used to store the semantic action function
// objects.
template <typename Iterator, typename Data>
struct semantic_actions<Iterator, mpl::false_, Data>
{
typedef void functor_type(Iterator&, Iterator&
, BOOST_SCOPED_ENUM(pass_flags)&, std::size_t&, Data&);
typedef boost::function<functor_type> functor_wrapper_type;
// add a semantic action function object
template <typename F>
void add_action(std::size_t unique_id, std::size_t, F act)
{
if (actions_.size() <= unique_id)
actions_.resize(unique_id + 1);
actions_[unique_id] = act;
}
// try to invoke a semantic action for the given token (unique_id)
BOOST_SCOPED_ENUM(pass_flags) invoke_actions(std::size_t /*state*/
, std::size_t& id, std::size_t unique_id, Iterator& end
, Data& data) const
{
// if there is nothing to invoke, continue with 'match'
if (unique_id >= actions_.size() || !actions_[unique_id])
return pass_flags::pass_normal;
// Note: all arguments might be changed by the invoked semantic
// action
BOOST_SCOPED_ENUM(pass_flags) match = pass_flags::pass_normal;
actions_[unique_id](data.get_first(), end, match, id, data);
return match;
}
std::vector<functor_wrapper_type> actions_;
};
// This specialization of semantic_actions will be used if the token
// type (lexer definition) needs to support states, resulting in a more
// complex data structure needed for storing the semantic action
// function objects.
template <typename Iterator, typename Data>
struct semantic_actions<Iterator, mpl::true_, Data>
{
typedef void functor_type(Iterator&, Iterator&
, BOOST_SCOPED_ENUM(pass_flags)&, std::size_t&, Data&);
typedef boost::function<functor_type> functor_wrapper_type;
// add a semantic action function object
template <typename F>
void add_action(std::size_t unique_id, std::size_t state, F act)
{
if (actions_.size() <= state)
actions_.resize(state + 1);
std::vector<functor_wrapper_type>& actions (actions_[state]);
if (actions.size() <= unique_id)
actions.resize(unique_id + 1);
actions[unique_id] = act;
}
// try to invoke a semantic action for the given token (unique_id)
BOOST_SCOPED_ENUM(pass_flags) invoke_actions(std::size_t state
, std::size_t& id, std::size_t unique_id, Iterator& end
, Data& data) const
{
// if there is no action defined for this state, return match
if (state >= actions_.size())
return pass_flags::pass_normal;
// if there is nothing to invoke, continue with 'match'
std::vector<functor_wrapper_type> const& actions = actions_[state];
if (unique_id >= actions.size() || !actions[unique_id])
return pass_flags::pass_normal;
// set token value
data.set_end(end);
// Note: all arguments might be changed by the invoked semantic
// action
BOOST_SCOPED_ENUM(pass_flags) match = pass_flags::pass_normal;
actions[unique_id](data.get_first(), end, match, id, data);
return match;
}
std::vector<std::vector<functor_wrapper_type> > actions_;
};
}
}}}}
#endif
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Swift