@Override
public void visit(ExpNode exp) throws ExpError {
// Note: Below we are passing 'null' as an EvalContext, this is not typically
// acceptable, but is 'safe enough' when we know the expression is a constant
if (exp instanceof BinaryOp) {
BinaryOp bo = (BinaryOp) exp;
if (bo.lSubExp instanceof Constant) {
// Just the left is a constant, store it in the binop
bo.lConstVal = bo.lSubExp.evaluate(null);
}
if (bo.rSubExp instanceof Constant) {
// Just the right is a constant, store it in the binop
bo.rConstVal = bo.rSubExp.evaluate(null);
}
}
if (exp instanceof Conditional) {
Conditional cond = (Conditional) exp;
if (cond.condExp instanceof Constant) {
cond.constCondRes = cond.condExp.evaluate(null);
}
if (cond.trueExp instanceof Constant) {
cond.constTrueRes = cond.trueExp.evaluate(null);
}
if (cond.falseExp instanceof Constant) {
cond.constFalseRes = cond.falseExp.evaluate(null);
}
}
if (exp instanceof FuncCall) {
FuncCall fc = (FuncCall) exp;
for (int i = 0; i < fc.args.size(); ++i) {
if (fc.args.get(i) instanceof Constant) {
fc.constResults.set(i, fc.args.get(i).evaluate(null));
}
}
}
}
