%{
#include <stdio.h>
#include <stdlib.h>
 
enum TokenType {
  INTEGER,
  OPERATOR,
  PARENTHESIS,
  EQUAL,
  UNKNOWN
};
 
const char *TokenTypeStrings[] = {
  "INTEGER",
  "OPERATOR",
  "PARENTHESIS",
  "EQUAL",
  "UNKNOWN"
};
 
struct Token {
  enum TokenType type;
  char *value;
};
%}
 
digit [0-9]
integer {digit}+
 
%%
 
{integer} {
  printf("INTEGER: %s\n", yytext);
}
 
[\+\-\*\/] {
  printf("OPERATOR: %s\n", yytext);
}
 
[\(\)] {
  printf("PARENTHESIS: %s\n", yytext);
}
 
\= {
  printf("EQUAL: %s\n", yytext);
}
 
. {
  printf("UNKNOWN: %s\n", yytext);
  exit(1);
}
 
%%
 
int main(int argc, char *argv[]) {
  yylex();
  return 0;
}
 

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