/**
* Returns a constructor function either by returning it from the registry if it exists or
* creating and registering a new type. If there is already a type, then warn if the existing type
* is different than the one we are creating, though still return the existing function if
* possible. The primary purpose of this is that registering a constructor will fail for all
* built-in types that are initialized in {@link JSTypeRegistry}. We a) want to make sure that the
* type information specified in the externs file matches what is in the registry and b) annotate
* the externs with the {@link JSType} from the registry so that there are not two separate JSType
* objects for one type.
*/
private FunctionType getOrCreateConstructor() {
FunctionType fnType =
typeRegistry.createConstructorType(fnName, sourceNode, parametersNode, returnType);
JSType existingType = typeRegistry.getType(fnName);
if (existingType != null) {
boolean isInstanceObject = existingType instanceof InstanceObjectType;
if (isInstanceObject || fnName.equals("Function")) {
FunctionType existingFn =
isInstanceObject
? ((InstanceObjectType) existingType).getConstructor()
: typeRegistry.getNativeFunctionType(FUNCTION_FUNCTION_TYPE);
if (existingFn.getSource() == null) {
existingFn.setSource(sourceNode);
}
if (!existingFn.hasEqualCallType(fnType)) {
reportWarning(TYPE_REDEFINITION, fnName, fnType.toString(), existingFn.toString());
}
return existingFn;
} else {
// We fall through and return the created type, even though it will fail
// to register. We have no choice as we have to return a function. We
// issue an error elsewhere though, so the user should fix it.
}
}
maybeSetBaseType(fnType);
if (getScopeDeclaredIn().isGlobal() && !fnName.isEmpty()) {
typeRegistry.declareType(fnName, fnType.getInstanceType());
}
return fnType;
}
