textDocument/signatureHelp response is invalid

[Yuriy Balyuk]

I send textDocument/signatureHelp
and get an invalid response from server: {'signatures': null, 'activeSignature': null, 'activeParameter': null}

according to LSP specs If no signatures are available the signature help request should return "null".

null values are not valid for members of SignatureHelp interface.

export interface SignatureHelp {
	/**
	 * One or more signatures. If no signatures are available the signature help
	 * request should return `null`.
	 */
	signatures: SignatureInformation[];
        activeSignature?: uinteger;
        activeParameter?: uinteger;

[Damjan Cvetko]

Doesn't seem to make much difference in VsCode, but I can change this. Thanks.

[Yuriy Balyuk]

I'm using it in CudaText. it complains in status bar:

This is not a crash, but still it is better to stick to the specification.

Thanks!

BTW: I'm planning to open an issue about this server is not working in stdio mode. only working through TCP socket. Can you confirm it is not working for you too?

[Damjan Cvetko]

It seems the STDIO has a problem with blocking reads. I'll look into it if it can be resolved...

[Damjan Cvetko]

I did look into it a bit more. I work on windows and there reading from STDIN and not blocking on it seems just... impossible...
I strongly suggest you use TCP.

[Yuriy Balyuk]

okay thank you.