jlsuarez7 opened a new issue, #9447:
URL: https://github.com/apache/netbeans/issues/9447
### Apache NetBeans version
Apache NetBeans 30
### What happened
The YAML editor reports syntax errors for valid YAML documents that use
tagged mappings.
For example, the following YAML is marked as invalid:
```yaml
customTaggedMapping: !example
name: test
enabled: true
plainMapping:
name: test
enabled: true
```
The editor reports:
```text
Mapping values are not allowed here.
```
on the nested mapping entries.
The same behavior occurs when using the standard YAML tag `!!map`:
```yaml
standardTaggedMapping: !!map
name: test
enabled: true
```
I also tested the flow-style equivalent:
```yaml
customTaggedMapping: !example { name: test, enabled: true }
standardTaggedMapping: !!map { name: test, enabled: true }
plainMapping: { name: test, enabled: true }
```
In this case NetBeans reports:
```text
Expected '<document start>', but found '<block mapping start>'
```
for the second and third lines.
The YAML validates in external YAML validators and is accepted by the
application consuming the file. The issue appears to be that NetBeans does not
correctly parse tagged nodes and subsequently loses synchronization with the
document structure, causing additional valid mappings to be reported as errors.
Expected behavior:
* Tagged mappings should be accepted as valid YAML syntax.
* Unknown custom tags such as `!example` may optionally generate a warning,
but should not cause syntax errors.
* Standard YAML tags such as `!!map` should be accepted without syntax
errors.
### Language / Project Type / NetBeans Component
YAML Editor
### How to reproduce
1. Open Apache NetBeans IDE 30.
2. Create a new file named `test.yaml`.
3. Paste the following content:
```yaml
a: !!map
b: 1
c:
d: 2
```
4. Save the file.
5. Observe that NetBeans reports:
```text
Mapping values are not allowed here.
```
on the line:
```yaml
b: 1
```
As an additional test, replace the contents with:
```yaml
a: !example
b: 1
c:
d: 2
```
The same error is reported.
As a control test, the following YAML is accepted:
```yaml
a:
b: 1
c:
d: 2
```
Minimal reproducer:
```yaml
a: !!map
b: 1
```
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Linux version 7.0.12-201.fc44.x86_64 running on amd64; UTF-8; en_US (nb)
### JDK
OpenJDK Runtime Environment 25.0.3
### Apache NetBeans packaging
Other
### Anything else
The problem occurs every time with tagged mappings.
One observation is that the parser appears to become confused after
encountering a tagged node. Subsequent valid mappings are then reported as
invalid as well, suggesting the YAML parser/editor loses synchronization with
the document structure after the tagged mapping is encountered.
Because the issue also occurs with the standard YAML tag `!!map`, this does
not appear to be limited to application-specific tags such as `!example`.
### Are you willing to submit a pull request?
No
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