[fpc-pascal] Null values with JSON RPC

[Michael Van Canneyt]

On Fri, 7 Aug 2020, Ryan Joseph via fpc-pascal wrote:

> I'm trying to get the pascal language server working on Visual Studio Code and during testing I found that sending null values to the server is causing problems. i.e.:
>
> ...
>    "processId": 3997,
>    "clientInfo": {
>        "name": "vscode",
>        "version": "1.47.3"
>    },
>    "rootPath": null,
>    "rootUri": null,
> ...
>
> This is translated by the RPC layer to a message like:
>
> {"jsonrpc":"2.0","error":{"code":-32603,"message":"Cannot convert data from Null value"},"id":1}
>
> According to the protocol null values are allowed so is there a  way I can
> accept null values gracefully instead of failing with an error?  In
> particular rootPath is trying to be mapped to a string so it could be
> translated to just '' and that would be better than giving this error that
> prevents the server from working entirely and causes very confusing errors
> that are hard to debug.

By itself, fpJSON of course allows null values.

What are you using as a serialization technologgy ?

Michael.