No suggestions in autocomplete

[Serhioromano]

I have managed to implement langium into my VS Code extension. Now I struggle with .langium syntax. Example.

entry Document:
    (functions+=Function)*;

Function:
    'FUNCTION' name=ID ':' return_type=Dtypes 'END_FUNCTION';

Dtypes returns string:
    'BOOL' | 'SINT' | 'USINT' | 'INT' | 'UINT' | 'DINT' | 'UDINT' | 'LINT' | 'ULINT' | 'REAL'
    | 'LREAL' | 'TIME' | 'TOD' | 'DT' | 'BYTE' | 'WORD' | 'DWORD';

terminal ID: /[_a-zA-Z][\w_]*/;

This is simplified version of file. But when I type in document

FUNCTION MyName : 

When I start type BOOL it immediately appear but other not. Why?

[msujew]

Hey @Serhioromano,

Interesting, it seems like the malformed input (i.e. 'B' which doesn't match any of the tokens) breaks the findLeafNodeAtOffset method and makes it return undefined. That will then result in no completion results:

https://github.com/langium/langium/blob/a18ebca4ce58391d1d7bbb7dc1509b6ec597bb23/packages/langium/src/lsp/completion/completion-provider.ts#L73-L79

I've created #778 to track this.