%{
#include "token.h"
%}
DIGIT [0-9]
LETTER [a-zA-Z]
%%
(" "|\t|\n) /* skip whitespace */
\+ { return TOKEN_ADD; }
"=" { return TOKEN_ASSIGNMENT; }
while { return TOKEN_WHILE; }
{LETTER}+ { return TOKEN_IDENT; }
{DIGIT}+ { return TOKEN_NUMBER; }
. { return TOKEN_ERROR; }
%%
int yywrap() { return 1; }