private Node transform(JsFor x) {
// The init expressions or var decl.
//
Node init;
if (x.getInitExpr() != null) {
init = transform(x.getInitExpr());
} else if (x.getInitVars() != null) {
init = transform(x.getInitVars());
} else {
init = IR.empty();
}
// The loop test.
//
Node cond;
if (x.getCondition() != null) {
cond = transform(x.getCondition());
} else {
cond = IR.empty();
}
// The incr expression.
//
Node incr;
if (x.getIncrExpr() != null) {
incr = transform(x.getIncrExpr());
} else {
incr = IR.empty();
}
Node body = transformBody(x.getBody(), x);
Node n = IR.forNode(init, cond, incr, body);
return applySourceInfo(n, x);
}
/**
* This is essentially a hacked-up version of JsFor.traverse to account for flow control differing
* from visitation order. It resets lastFile and lastLine before the condition and increment
* expressions in the for loop so that location data will be recorded correctly.
*/
@Override
public boolean visit(JsFor x, JsContext ctx) {
if (x.getInitExpr() != null) {
x.setInitExpr(accept(x.getInitExpr()));
} else if (x.getInitVars() != null) {
x.setInitVars(accept(x.getInitVars()));
}
if (x.getCondition() != null) {
resetPosition();
x.setCondition(accept(x.getCondition()));
}
if (x.getIncrExpr() != null) {
resetPosition();
x.setIncrExpr(accept(x.getIncrExpr()));
}
accept(x.getBody());
return false;
}