Known Issue

1. Scala for comprehension calls is not supported

For example:

class B() {
  def bar() = Option("bar")
}

class A(b: B) {
  def foo() = {
    val r = "foo" + b.bar().getOrElse("?")
    r
  }

  def foo2() = {
    val r = for {
      x <- b.bar()
    } yield "foo" + x
    r.getOrElse("?")
  }
}
                

the for comprehension call

    val r = for {
      x <- b.bar()
    } yield "foo" + x
                

it's UAST tree is `UastEmptyexpression`

UMethod (name = foo2)
            UBlockExpression
                UDeclarationsExpression
                    ULocalVariable (name = r)
                        UastEmptyExpression(type = PsiType:Option<String>)
                UReturnExpression
                    UQualifiedReferenceExpression
                        USimpleNameReferenceExpression (identifier = r)
                        UMethodCall(name = getOrElse)
                            UIdentifier (Identifier (getOrElse))
                            ULiteralExpression (value = "?")
                

so the `b.bar()` method call will not generate base on `UastEmptyexpression`. Hopefully, the UAST api will solve this problem sooner.

2. Groovy method body is not supported

For example:

/**
 * A Class description
 */
class Student {
    /** the name of the person */
    String name

    /**
     * Creates a greeting method for a certain person.
     *
     * @param otherPerson the person to greet
     * @return a greeting message
     */
    //known issue: groovy method will not generate in UAST
    String greet(String otherPerson) {
        "Hello ${otherPerson}"
        // call java
        Fruit fruit = new Banana()
        fruit.eat()

    }
}
                

Based on UAST api limitation, it's UAST tree is no method body mappings.

UFile (package = van.demo.grovvy)
    UClass (name = Student)
        UMethod (name = greet)
            UParameter (name = otherPerson)
                

When generate sequence of method `greet`, the calls in the method body will not generate (the call java code in the body of `greet`).

        "Hello ${otherPerson}"
        // call java
        Fruit fruit = new Banana()
        fruit.eat()