private boolean hasRTTImplements(ClassElement classElement) {
InterfaceType superType = classElement.getSupertype();
return ((superType != null && !superType.getElement().isObject())
|| !classElement.getInterfaces().isEmpty());
}
private InterfaceType checkedAsInstanceOf(
Type t, ClassElement element, Set<TypeVariable> variablesReferenced, Set<Type> checkedTypes) {
// check for recursion
if (checkedTypes.contains(t)) {
return null;
}
checkedTypes.add(t);
// check current Type
switch (TypeKind.of(t)) {
case FUNCTION_ALIAS:
case INTERFACE:
{
if (t.getElement().equals(element)) {
return (InterfaceType) t;
}
InterfaceType ti = (InterfaceType) t;
ClassElement tElement = ti.getElement();
InterfaceType supertype = tElement.getSupertype();
// super type
if (supertype != null) {
InterfaceType result =
checkedAsInstanceOf(
asSupertype(ti, supertype), element, variablesReferenced, checkedTypes);
if (result != null) {
return result;
}
}
// interfaces
for (InterfaceType intf : tElement.getInterfaces()) {
InterfaceType result =
checkedAsInstanceOf(
asSupertype(ti, intf), element, variablesReferenced, checkedTypes);
if (result != null) {
return result;
}
}
// mixins
for (InterfaceType mixin : tElement.getMixins()) {
if (mixin.getElement().equals(element)) {
return asSupertype(ti, mixin);
}
}
// no
return null;
}
case FUNCTION:
{
Element e = t.getElement();
switch (e.getKind()) {
case CLASS:
// e should be the interface Function in the core library. See the
// documentation comment on FunctionType.
InterfaceType ti = (InterfaceType) e.getType();
return checkedAsInstanceOf(ti, element, variablesReferenced, checkedTypes);
default:
return null;
}
}
case VARIABLE:
{
TypeVariable v = (TypeVariable) t;
Type bound = v.getTypeVariableElement().getBound();
// Check for previously encountered variables to avoid getting stuck in an infinite loop.
if (variablesReferenced.contains(v)) {
if (bound instanceof InterfaceType) {
return (InterfaceType) bound;
}
return typeProvider.getObjectType();
}
variablesReferenced.add(v);
return checkedAsInstanceOf(bound, element, variablesReferenced, checkedTypes);
}
default:
return null;
}
}
private void generateRTTAddToMethod(DartClass x) {
ClassElement classElement = x.getSymbol();
// 2) create "addTo" method
// Foo$Type$addTo(target, typeargs) {
// var rtt = Foo$lookupOrCreateRTT(typeargs)
// target.implementedTypes[rtt.classkey] = rtt;
// }
// Build the function
JsFunction addToFn = new JsFunction(globalScope);
addToFn.setBody(new JsBlock());
JsScope scope = new JsScope(globalScope, "temp");
JsName targetType = scope.declareName("target");
addToFn.getParameters().add(new JsParameter(targetType));
// Get the RTT info object
JsName rtt = scope.declareName("rtt");
List<JsStatement> body = addToFn.getBody().getStatements();
JsInvocation callLookup = newInvocation(getRTTLookupMethodName(classElement));
if (hasTypeParameters(classElement)) {
JsName typeArgs = scope.declareName("typeArgs");
addToFn.getParameters().add(new JsParameter(typeArgs));
callLookup.getArguments().add(new JsNameRef(typeArgs));
}
JsStatement rttLookup = newVar((SourceInfo) null, rtt, callLookup);
body.add(rttLookup);
// store it.
JsExpression addToTypes =
newAssignment(
new JsArrayAccess(
newNameRef(targetType.makeRef(), "implementedTypes"),
newNameRef(rtt.makeRef(), "classKey")),
rtt.makeRef());
body.add(addToTypes.makeStmt());
InterfaceType superType = classElement.getSupertype();
if (superType != null && !superType.getElement().isObject()) {
ClassElement interfaceElement = superType.getElement();
JsInvocation callAddTo =
newInvocation(getRTTAddToMethodName(interfaceElement), targetType.makeRef());
if (hasTypeParameters(interfaceElement) && !superType.hasDynamicTypeArgs()) {
JsArrayLiteral superTypeArgs = new JsArrayLiteral();
List<? extends Type> typeParams = classElement.getTypeParameters();
for (Type arg : superType.getArguments()) {
superTypeArgs
.getExpressions()
.add(
buildTypeLookupExpression(
arg, typeParams, nameref(null, targetType.makeRef(), "typeArgs")));
}
callAddTo.getArguments().add(superTypeArgs);
}
body.add(callAddTo.makeStmt());
}
// Add the interfaces
for (InterfaceType interfaceType : classElement.getInterfaces()) {
ClassElement interfaceElement = interfaceType.getElement();
JsInvocation callAddTo =
call(null, getRTTAddToMethodName(interfaceElement), targetType.makeRef());
if (hasTypeParameters(interfaceElement) && !interfaceType.hasDynamicTypeArgs()) {
JsArrayLiteral interfaceTypeArgs = new JsArrayLiteral();
List<? extends Type> typeParams = classElement.getTypeParameters();
for (Type arg : interfaceType.getArguments()) {
interfaceTypeArgs
.getExpressions()
.add(
buildTypeLookupExpression(
arg, typeParams, nameref(null, targetType.makeRef(), "typeArgs")));
}
callAddTo.getArguments().add(interfaceTypeArgs);
}
body.add(callAddTo.makeStmt());
}
// Add the function statement
JsExpression fnDecl = newAssignment(getRTTAddToMethodName(classElement), addToFn);
globalBlock.getStatements().add(fnDecl.makeStmt());
}