import java_cup.runtime.Symbol;

%%

%public
%class Scanner

%type Symbol
%function token
%eofval{
  return new Symbol(sym.EOF);
%eofval}

comment	= ("#".*)
space	= [\ \t\b\015]+
digit	= [0-9]
integer	= {digit}+
exp	= ([eE]("+"|"-")?{digit}+)
real	= ({digit}+"."{digit}*{exp}?|"."{digit}+{exp}?|{digit}+{exp})

%%

{space}		{ }
{comment}	{ }
{integer}	{ return new Symbol(sym.CONSTANT, new Integer(yytext())); }
{integer}[lL]	{ return new Symbol(sym.CONSTANT,
		    new Long(yytext().substring(0, yytext().length()-1))); }
{real}		{ return new Symbol(sym.CONSTANT, new Double(yytext())); }
\n		{ return new Symbol(sym.NL); }
"+"		{ return new Symbol(sym.ADD); }
"-"		{ return new Symbol(sym.SUB); }
"*"		{ return new Symbol(sym.MUL); }
"/"		{ return new Symbol(sym.DIV); }
"%"		{ return new Symbol(sym.MOD); }
"("		{ return new Symbol(sym.LPAR); }
")"		{ return new Symbol(sym.RPAR); }
.		{ return new Symbol(sym.error); }