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/*
Ousía
Copyright (C) 2014, 2015 Benjamin Paaßen, Andreas Stöckel
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file TokenRegistry.hpp
*
* Contains the TokenRegistry class used for registering all user defined tokens
* during the parsing process.
*
* @author Andreas Stöckel (astoecke@techfak.uni-bielefeld.de)
*/
#ifndef _OUSIA_PARSER_STACK_TOKEN_REGISTRY_HPP_
#define _OUSIA_PARSER_STACK_TOKEN_REGISTRY_HPP_
#include <string>
#include <unordered_map>
#include <core/common/Token.hpp>
namespace ousia {
namespace parser_stack {
// Forward declarations
class ParserCallbacks;
/**
* The TokenRegistry class is used for registering all user defined tokens
* during the Parsing process. The TokenRegistry class acts as an adapter
* between the parser which allocates a TokenId for each unique token and the
* Handler classes which may register the same token multiple times and expect
* the same TokenId to be returned for the same token.
*/
class TokenRegistry {
private:
/**
* Reference at the ParserCallback instance the tokens are relayed to.
*/
ParserCallbacks &parser;
/**
* Store containing all TokenId instances for all registered tokens. The map
* maps from the token strings to the corresponding TokenId and a reference
* count.
*/
std::unordered_map<std::string, std::pair<TokenId, size_t>> tokens;
/**
* Reverse map containing the string corresponding to a TokenId.
*/
std::unordered_map<TokenId, std::string> tokenIds;
public:
/**
* Constructor of the TokenRegistry class.
*
* @param parser is the underlying parser implementing the ParserCallbacks
* interface to which all calls are relayed.
*/
TokenRegistry(ParserCallbacks &parser) : parser(parser) {}
/**
* Destructor of the TokenRegistry class, removes all registered tokens from
* the parser.
*/
~TokenRegistry();
/* No copy construction */
TokenRegistry(const TokenRegistry &) = delete;
/* No assignment */
TokenRegistry &operator=(const TokenRegistry &) = delete;
/**
* Registers the given string token in the underlying parser and returns the
* TokenId of that token. If the same token string is given multiple times,
* the same TokenId is returned. The token is only registered once in the
* parser.
*
* @param token is the token that should be registered.
* @return the TokenId associated with this token.
*/
TokenId registerToken(const std::string &token);
/**
* Unregisters the token with the given TokenId from the parser. Note that
* the token will only be unregistered if unregisterToken() has been called
* as many times as registerToken() for the same token.
*
* @param id is the id of the token returned by registerToken() that should
* be unregistered.
*/
void unregisterToken(TokenId id);
};
}
}
#endif /* _OUSIA_PARSER_STACK_TOKEN_REGISTRY_HPP_ */
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