public Code EvalLiteralWordAtom(ParseTreeNode node, ref CgContext ctx)
{
switch (node.Term.Name)
{
case "identifier":
return new Code(EvalIdentifier(node, ref ctx));
case "character":
return new Code(EvalCharacter(node, ref ctx));
case "number":
return new Code(EvalNumber(node, ref ctx));
case "DifferenceLiteral":
{
var @base = ctx.GetCurrentAddress();
var target = EvalLiteralWordAtom(node.ChildNodes[0].ChildNodes[0], ref ctx);
return ctx.EncodeDifference(new Difference(@base, target));
}
case "DifferenceTo":
return EvalLiteralWordAtom(node.ChildNodes[0], ref ctx);
default:
throw new UnexpectedGrammarException();
}
}