Forward ref check #136
Forward ref check #136
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cchantep
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| val implTpeName = Option(impl.tpe).fold("null")(_.toString) | ||
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| if (implTpeName.startsWith(forwardPrefix) || | ||
| (implTpeName.startsWith("play.api.libs.json") && |
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I don't think starting with play.api.libs.json proves it's a built-in format. If you use Writes.apply you'll have a class named something like play.api.libs.json.Writes$$anon$6@509f0a9d.
Maybe it's worth just skipping this check and doing the null check for everything?
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Are you sure? I'm pretty sure the lambda is defined in the class it's lexically inside. E.g. if you go to https://alvinalexander.com/scala/anonymous-classes-in-scala-examples and grep for AnonymousClassTest1 you'll see an example.
But I also have no problem with doing a null check for everything since the cost will be low.
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@cchantep can you verify this with a unit test?
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I may be mistaken here, but as I understand it impl is the Tree representing the implementation of the implicit Writes/Reads/Format. So if I have something like:
implicit val fooWrites = Writes[Foo] { foo => JsString(foo.value) }then Play is creating the anonymous class for you based on the lambda you passed. I wouldn't expect impl.tpe to be useful here in identifying Play-provided formats.
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Such factory is instantiating from FunctionalX classes, not excluded from the null-check, contrary to other types from the package
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| val implTpeName = Option(impl.tpe).fold("null")(_.toString) | ||
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| if (implTpeName.startsWith(forwardPrefix) || | ||
| (implTpeName.startsWith("play.api.libs.json") && |
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Are you sure? I'm pretty sure the lambda is defined in the class it's lexically inside. E.g. if you go to https://alvinalexander.com/scala/anonymous-classes-in-scala-examples and grep for AnonymousClassTest1 you'll see an example.
But I also have no problem with doing a null check for everything since the cost will be low.
| !implTpeName.contains("MacroSpec"))) { | ||
| impl // Avoid extra check for builtin formats | ||
| } else { | ||
| q"""_root_.java.util.Objects.requireNonNull($impl, "Invalid implicit resolution (forward reference?) for '" + $cn + "': " + ${implTpeName})""" |
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Invalid implicit resolution -> Implicit value was null?
cchantep
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| @@ -32,26 +32,27 @@ object OFormat { | |||
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| implicit def GenericOFormat[T](implicit fjs: Reads[T], tjs: OWrites[T]): Format[T] = apply(fjs, tjs) | |||
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| def apply[A](read: JsValue => JsResult[A], write: A => JsObject): OFormat[A] = new OFormat[A] { | |||
| def apply[A](read: JsValue => JsResult[A], write: A => JsObject): OFormat[A] = | |||
| new FunctionalOFormat[A](read, write) | |||
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Use specific impl class, not to exclude null-check for instances created by these factories
| val implTpeName = Option(impl.tpe).fold("null")(_.toString) | ||
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| if (implTpeName.startsWith(forwardPrefix) || | ||
| (implTpeName.startsWith("play.api.libs.json") && |
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Such factory is instantiating from FunctionalX classes, not excluded from the null-check, contrary to other types from the package
| @@ -187,44 +190,6 @@ object Reads extends ConstraintReads with PathReads with DefaultReads with Gener | |||
| implicit val JsArrayReducer = Reducer[JsValue, JsArray](js => JsArray(Array(js))) | |||
| } | |||
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| /** | |||
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is anyone interested in pursuing this further, or should we just close it for inactivity? |
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Fix #120