@Override
public void visit(Symbol symbol) {
if (context.hasVariable(symbol)) {
result = unpromise(context.getVariable(symbol));
} else {
result = symbol;
}
}
private PairList substituteArgumentList(PairList arguments) {
PairList.Builder builder = PairList.Node.newBuilder();
for (PairList.Node node : arguments.nodes()) {
if (node.getValue().equals(Symbols.ELLIPSES)) {
SEXP extraArguments = context.getVariable(Symbols.ELLIPSES);
if (extraArguments != Symbol.UNBOUND_VALUE) {
builder.addAll(unpackPromiseList((PromisePairList) extraArguments));
} else {
builder.add(Symbols.ELLIPSES);
}
} else {
builder.add(node.getRawTag(), substitute(node.getValue()));
}
}
return builder.build();
}