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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 Callbacks.hpp
*
* Contains an interface defining the callbacks that can be directed from a
* StateHandler to the StateStack, and from the StateStack to
* the actual parser.
*
* @author Andreas Stöckel (astoecke@techfak.uni-bielefeld.de)
*/
#ifndef _OUSIA_PARSER_STACK_CALLBACKS_HPP_
#define _OUSIA_PARSER_STACK_CALLBACKS_HPP_
#include <string>
#include <core/common/Whitespace.hpp>
namespace ousia {
namespace parser_stack {
/**
* Interface defining a set of callback functions that act as a basis for the
* StateStackCallbacks and the ParserCallbacks.
*/
class Callbacks {
public:
/**
* Virtual descructor.
*/
virtual ~Callbacks() {};
/**
* Sets the whitespace mode that specifies how string data should be
* processed.
*
* @param whitespaceMode specifies one of the three WhitespaceMode constants
* PRESERVE, TRIM or COLLAPSE.
*/
virtual void setWhitespaceMode(WhitespaceMode whitespaceMode) = 0;
/**
* Registers the given token as token that should be reported to the handler
* using the "token" function.
*
* @param token is the token string that should be reported.
*/
virtual void registerToken(const std::string &token) = 0;
/**
* Unregisters the given token, it will no longer be reported to the handler
* using the "token" function.
*
* @param token is the token string that should be unregistered.
*/
virtual void unregisterToken(const std::string &token) = 0;
};
/**
* Interface defining the callback functions that can be passed from a
* StateStack to the underlying parser.
*/
class ParserCallbacks : public Callbacks {
/**
* Checks whether the given token is supported by the parser. The parser
* returns true, if the token is supported, false if this token cannot be
* registered. Note that parsers that do not support the registration of
* tokens at all should always return "true".
*
* @param token is the token that should be checked for support.
* @return true if the token is generally supported (or the parser does not
* support registering tokens at all), false if the token is not supported,
* because e.g. it is a reserved token or it interferes with other tokens.
*/
virtual bool supportsToken(const std::string &token) = 0;
};
}
}
#endif /* _OUSIA_PARSER_STACK_CALLBACKS_HPP_ */
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