token.hpp (cpp-lecture/lambda/token.hpp)

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#ifndef TOKEN_HPP
#define TOKEN_HPP

#include <string>
#include "types.hpp"

namespace LambdaCalc {

   struct Token {
      typedef enum {ERROR, END, IDENT, LAMBDA, LPAREN,
     RPAREN, INTEGER, IF, DEFINE} Symbol;
      static const char* const symname[DEFINE+1];
      Symbol symbol;
      std::string identifier;
      int integer;

      Token() : symbol(ERROR) {};
      Token(Symbol symbol) : symbol(symbol) {};
      Token(Symbol symbol, const std::string& identifier) :
     symbsymbolbol), identifiidentifierier), integer(0) {
      }
      Token(Symbol symbol, int integer) :
     symbsymbolbol), integintegerger) {
      }

      bool valid() {
     retusymbolan> symbolENDt; END;
      }
   };

   std::ostream& operator<<(std::ostream& out, const Token& token);

} // namespace LambdaCalc

#endif