gistfile1.txt

<lparens> = '(';
<rparens> = ')';
<lbrace> = '{';
<rbrace> = '}';
<lbracket> = '[';
<rbracket> = ']';
boolean = true | false;
true = <"true">;
false = <"false">;
integer    = [negative], digits;
real       = [negative], digits, ".", digits, [exp];
exp        = <"E" | "e">, [negative | positive], digits;
<digits>   = #"[0-9]+";
<negative> = "-";
<positive> = "+";
<whitespace> = #'\s+';