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// parser.h
#include "entity.h"
template <class T>
class ParserEventListener {
public:
virtual void update(T entity) = 0;
};
template <class T>
class Parser {
public:
virtual void add_listener(ParserEventListener<T*>* listener) = 0;
virtual void remove_listener(ParserEventListener<T*>* listener) = 0;
virtual void consume(char c, int pos) = 0;
virtual Array<T*>* get_result() = 0;
virtual void reset() = 0;
};
template <class T>
class AbstractParser: public Parser<T>, public ParserEventListener<T*> {
public:
static const int ZERO_STATE = 0;
AbstractParser();
virtual ~AbstractParser();
void add_listener(ParserEventListener<T*>* listener);
void remove_listener(ParserEventListener<T*>* listener);
void update(T* entity);
virtual void consume(char c, int pos) = 0;
Array<T*>* get_result();
virtual void reset() = 0;
protected:
void add_context(T* value);
bool has_state(int n, ...);
int _state;
private:
Array<ParserEventListener<T*>*> _listeners;
Array<T*> _context;
}; |