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#ifndef SYMBOL_H
#define SYMBOL_H
typedef unsigned int symbol;
extern size_t total_symbols;
// extern char *symbol_to_str[] ...
extern int (*symbol_is_terminal)(symbol s);
extern int (*symbol_is_input_end)(symbol s);
extern int (*symbol_is_valid)(symbol s);
// helper macro
#define IMPLEMENT_FUNCPTR(type, name, args, ...) \
type __##name args __VA_ARGS__ \
type (*name) args = __##name;
#endif
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