%%

%class Lexer 
%type Token
%function next_token
%char
%line
%eofval{
   return new Token (sym.EOF, null);
%eofval}
%yylexthrow{
   Exception
%yylexthrow}

WHITESPACE = [\ \t\r\n]+
INTEGER_LITERAL = [0-9]+
%%
<YYINITIAL> ";" 	{return new Token (sym.SEMICOLON,   yychar,yychar+1,yytext(),yyline);}
<YYINITIAL> "="         {return new Token (sym.EQUALS, yychar,yychar+1,yytext(),yyline);}




<YYINITIAL>{INTEGER_LITERAL} {return new Token (sym.INTEGER_LITERAL,yychar,yychar+yytext().length(),new Integer(yytext()),yyline);}

<YYINITIAL>{WHITESPACE}   { }
. { throw new Exception ("Lexical: unmatched input at line " + (yyline+1));
  }