Annotator for custom language

IntelliJ Platform
1

I’m developing a custom language plugin.
The language support @xxxx to refer to xxxx argument defined some other golang files

I tried to add an annotator for those “@xxxx” element to make it

  • display in red color when there is no “xxxx” argument it can refer to.
final class MyAnnotator implements Annotator {
  @Override
  public void annotate(@NotNull final PsiElement element, @NotNull AnnotationHolder holder) {
     ...
  }
}

<annotator language="MyLang" implementationClass=".....MyAnnotator" />

But it seems like that then annotator is never called.

I have some similar annotator, it works for yaml. So I guess to support annotator, custom language PSI element should implement some special methods ? ( Just like this issue )

2

Hi!

When I create a new language support plugin I usually start highlighting the code nodes.
I use Annotators to highlight nodes that aren’t leaf, because there no other way.

As far as I remember there were no big issues with doing so.

Here is how .gitattributes plugin looks like inside:

image
image1486×748 81.3 KB

image
image1444×846 77.3 KB

image
image1584×680 93.2 KB

image
image1872×1280 355 KB

I don’t know may it help you or not, but you may check if there are no extra difficulty in your codebase.

I guess Annotator may not find you psi elements because they are not in the psi tree. Check your code snippet with PsiViewer.

3

Maybe the annotator did not get scheduled in the background the last time I tried.

Now it works.

4

Good news.
Sometimes restarting IDE really helps.