RFR: 7903788: preparation towards json configuration for jextract tool

[Maurizio Cimadamore]

On Fri, 16 Aug 2024 12:04:46 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> * adding json skara code into org.openjdk.jextract.json.parser package. Minor changes done - pretty printing, JSONValue is made sealed and access changes (private final fields).
>> * org.openjdk.jextract.json package for JSON interface to the rest of the jextract tool. Main interface is org.openjdk.jextract.json.JSON. parse and toString methods to convert record into JSON String and vice versa.
>> * Other classes are public mainly for testing purposes. build.gradle adjusted with the required --add-exports clauses so that jextract module does not have to export the new json packages.
>
> src/main/java/org/openjdk/jextract/json/parser/JSONArray.java line 59:
> 
>> 57:     }
>> 58: 
>> 59:     public JSONArray set(int i, boolean value) {
> 
> Given we're not really planning to use this API directly, I think the setters are redundant. E.g. we should probably strive to build _immutable_ JSON nodes (and then map them back and forth into records). In this particular case, just copying the elements into an immutable list (`List::of`) will suffice - then we can drop all the setters. Probably similar simple changes in other classes will work too.

I also note that all the other classes (except JSONObject) seem to be non-mutable...

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PR Review Comment: https://git.openjdk.org/jextract/pull/257#discussion_r1719759443