RFR: 8262889: Compiler implementation for Record Patterns

[Vicente Romero]

On Thu, 5 May 2022 15:21:49 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> 8262889: Compiler implementation for Record Patterns
>> 
>> A first version of a patch that introduces record patterns into javac as a preview feature. For the specification, please see:
>> http://cr.openjdk.java.net/~gbierman/jep427+405/jep427+405-20220426/specs/patterns-switch-record-patterns-jls.html
>> 
>> There are two notable tricky parts:
>> -in the parser, it was necessary to improve the `analyzePattern` method to handle nested/record patterns, while still keeping error recovery reasonable
>> -in the `TransPatterns`, the desugaring of the record patterns is very straightforward - effectivelly the record patterns are desugared into guards/conditions. This will likely be improved in some future version/preview
>> 
>> `MatchException` has been extended to cover additional cases related to record patterns.
>
> src/java.base/share/classes/jdk/internal/javac/PreviewFeature.java line 64:
> 
>> 62:     public enum Feature {
>> 63:         SWITCH_PATTERN_MATCHING,
>> 64:         DECONSTRUCTION_PATTERNS,
> 
> The spec and JEP talks about record patterns - I think we should follow the correct name here

yup, I agree

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PR: https://git.openjdk.java.net/jdk/pull/8516