// Copyright (c) 2001-2011 Hartmut Kaiser
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#if !defined(BOOST_SPIRIT_LEX_LEXER_SEMANTIC_ACTION_DATA_JUN_10_2009_0417PM)
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#define BOOST_SPIRIT_LEX_LEXER_SEMANTIC_ACTION_DATA_JUN_10_2009_0417PM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/lex/lexer/pass_flags.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/function.hpp>
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#include <vector>
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namespace boost { namespace spirit { namespace lex { namespace lexertl
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{
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namespace detail
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{
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///////////////////////////////////////////////////////////////////////
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template <typename Iterator, typename SupportsState, typename Data>
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struct semantic_actions;
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// This specialization of semantic_actions will be used if the token
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// type (lexer definition) does not support states, which simplifies
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// the data structures used to store the semantic action function
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// objects.
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template <typename Iterator, typename Data>
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struct semantic_actions<Iterator, mpl::false_, Data>
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{
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typedef void functor_type(Iterator&, Iterator&
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, BOOST_SCOPED_ENUM(pass_flags)&, std::size_t&, Data&);
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typedef boost::function<functor_type> functor_wrapper_type;
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// add a semantic action function object
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template <typename F>
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void add_action(std::size_t unique_id, std::size_t, F act)
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{
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if (actions_.size() <= unique_id)
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actions_.resize(unique_id + 1);
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actions_[unique_id] = act;
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}
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// try to invoke a semantic action for the given token (unique_id)
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BOOST_SCOPED_ENUM(pass_flags) invoke_actions(std::size_t /*state*/
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, std::size_t& id, std::size_t unique_id, Iterator& end
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, Data& data) const
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{
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// if there is nothing to invoke, continue with 'match'
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if (unique_id >= actions_.size() || !actions_[unique_id])
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return pass_flags::pass_normal;
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// Note: all arguments might be changed by the invoked semantic
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// action
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BOOST_SCOPED_ENUM(pass_flags) match = pass_flags::pass_normal;
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actions_[unique_id](data.get_first(), end, match, id, data);
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return match;
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}
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std::vector<functor_wrapper_type> actions_;
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};
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// This specialization of semantic_actions will be used if the token
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// type (lexer definition) needs to support states, resulting in a more
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// complex data structure needed for storing the semantic action
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// function objects.
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template <typename Iterator, typename Data>
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struct semantic_actions<Iterator, mpl::true_, Data>
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{
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typedef void functor_type(Iterator&, Iterator&
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, BOOST_SCOPED_ENUM(pass_flags)&, std::size_t&, Data&);
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typedef boost::function<functor_type> functor_wrapper_type;
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// add a semantic action function object
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template <typename F>
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void add_action(std::size_t unique_id, std::size_t state, F act)
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{
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if (actions_.size() <= state)
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actions_.resize(state + 1);
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std::vector<functor_wrapper_type>& actions (actions_[state]);
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if (actions.size() <= unique_id)
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actions.resize(unique_id + 1);
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actions[unique_id] = act;
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}
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// try to invoke a semantic action for the given token (unique_id)
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BOOST_SCOPED_ENUM(pass_flags) invoke_actions(std::size_t state
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, std::size_t& id, std::size_t unique_id, Iterator& end
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, Data& data) const
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{
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// if there is no action defined for this state, return match
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if (state >= actions_.size())
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return pass_flags::pass_normal;
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// if there is nothing to invoke, continue with 'match'
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std::vector<functor_wrapper_type> const& actions = actions_[state];
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if (unique_id >= actions.size() || !actions[unique_id])
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return pass_flags::pass_normal;
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// set token value
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data.set_end(end);
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// Note: all arguments might be changed by the invoked semantic
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// action
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BOOST_SCOPED_ENUM(pass_flags) match = pass_flags::pass_normal;
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actions[unique_id](data.get_first(), end, match, id, data);
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return match;
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}
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std::vector<std::vector<functor_wrapper_type> > actions_;
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};
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}
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}}}}
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#endif
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