private JsExpression generateRawInterfaceTypeComparison(
JsExpression lhs, DartTypeNode typeNode, SourceInfo src) {
ClassElement element = (ClassElement) typeNode.getType().getElement();
if (element.equals(typeProvider.getObjectType().getElement())) {
// Everything is an object, including null
return this.translationContext.getProgram().getTrueLiteral();
}
String builtin = builtInTypeChecks.get(element);
if (builtin != null) {
return call(src, nameref(src, builtin), lhs);
}
// Due to implementing implied interfaces of classes, we always have to
// use $implements$ rather than using JS instanceof for classes.
// Inject: !!(tmp = target, tmp && tmp.$implements$type)
JsProgram program = translationContext.getProgram();
JsName tmp = context.createTemporary();
String mangledClass = translationContext.getMangler().mangleClassName(element);
return not(
src,
not(
src,
comma(
src,
assign(src, tmp.makeRef(), lhs),
and(
src,
neq(src, tmp.makeRef().setSourceRef(src), program.getNullLiteral()),
nameref(src, tmp, "$implements$" + mangledClass)))));
}
private void injectInterfaceMarkers(ClassElement classElement, SourceInfo srcRef) {
JsProgram program = translationContext.getProgram();
JsName classJsName = translationContext.getNames().getName(classElement);
for (InterfaceType iface : getAllInterfaces(classElement)) {
JsStatement assignment =
(JsStatement)
newAssignment(
newNameRef(
newNameRef(new JsNameRef(classJsName), "prototype"),
"$implements$"
+ translationContext
.getMangler()
.mangleClassName(iface.getElement())),
program.getNumberLiteral(1))
.makeStmt()
.setSourceRef(srcRef);
globalBlock.getStatements().add(assignment);
}
}