lahodaj opened a new pull request, #9285:
URL: https://github.com/apache/netbeans/pull/9285
This is something I was looking at long time ago, but was not very happy
about the UI. So I was trying to improve the UI, but I didn't make progress on
that, and this got stashed. So, now I decided to try to recover this, even with
the not-so-nice UI.
I would consider this patch to be a fairly advanced prototype.
Currently, having code like:
```
List.of("a", "b", "c")
.stream()
.map(s -> s).filter(s -> !s.isEmpty())
.forEach(s -> System.err.println(s));
}
```
putting a breakpoint at the line with `map` will mean the debugger will stop
at the line when `map` is called, and then each time any of the lambdas is
called. This is rarely what one wants. It would be better to be able to say
that I want the debugger to stop at e.g. the first lambda.
This is what this PR is trying to do. There's an ability to specify the
breakpoint applies to n-th lambda on the given line. Special values are `-1`,
which means to stop at the line outside of any lambda, and `Integer.MIN_VALUE`,
which means stop each time this line is reached, regardless of any lambdas.
This is the way it works on the backend.
Inside the NetBeans UI, it works like this:
- when a line breakpoint is added on a line with lambdas, it is considered
to be on the line only, and there's a disable lambda breakpoint added for each
lambda automatically. These can then be enabled/disabled independently.
- when the line breakpoint is removed, all the lambda breakpoints are
removed as well.
The ability is also used in the DAP Java server, for use in DAP clients
(e.g. in VS Code). The UI in VS Code is better, but also has some sharp edges.
Inside NB, it can look like this:
<img width="683" height="249" alt="lambda-breakpoints-editor"
src="https://github.com/user-attachments/assets/22850b02-5b07-4aa0-930f-7f6e367a45e4";
/>
<img width="1146" height="328" alt="lambda-breakpoints-view"
src="https://github.com/user-attachments/assets/2773fc6e-4a4c-4f54-9893-06ddbd50b754";
/>
---
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