llvm-tutorial/source/Lexer.h

#ifndef _LEXER_H
#define _LEXER_H

// Standard includes
#include <string>

namespace lexer{
// The lexer returns tokens [0-255] if it is an unknown character, otherwise one
// of these for known things.
enum Token {
  tok_eof = -1,

  // commands
  tok_def = -2,
  tok_extern = -3,

  // primary
  tok_identifier = -4,
  tok_number = -5,

  // control
  tok_if = -6,
  tok_then = -7,
  tok_else = -8,
  tok_for = -9,
  tok_in = -10,
  // operators
  tok_binary = -11,
  tok_unary = -12
};

struct LexerObjects {
public:
  static std::string IdentifierStr; // Filled in if tok_identifier
  static double NumVal;
};

int gettok();
}

#endif