loadAstNode

[cdietrich]

the code in buildReference where the element is isAstNodeDescription

calls loadAstNode which calls this.langiumDocuments().getDocument

what is the proper way to make this work with lazy documents?

[msujew]

Hey @cdietrich,

if the document isn't in memory yet, you would need to load it from disk and parse it. Likely via this method:

langium/packages/langium/src/workspace/documents.ts

Line 138 in 21b1051

fromString<T extends AstNode = AstNode>(text: string, uri: URI, options?: ParserOptions): LangiumDocument<T>;

Since this can happen in the process of resolving a variable (which is happening in sync contexts), loading the file needs to happen in sync as well.

[cdietrich]

what i dont get though it goes into the if also if the document is present. need to check why

[cdietrich]

getOrCreateDocument calls getDocument ....

[msujew]

You should override loadAstNode. Loading a document dynamically is currently not supported directly in the framework.

[cdietrich]

ok

export class SampleLinker extends DefaultLinker {
    protected override loadAstNode(nodeDescription: AstNodeDescription): AstNode | undefined {
        if (nodeDescription.node) {
            return nodeDescription.node;
        }
        let doc = this.langiumDocuments().getDocument(nodeDescription.documentUri);
        if (!doc) {
            const content = fs.readFileSync(nodeDescription.documentUri.fsPath, 'utf-8')
            doc = this.langiumDocuments().createDocument(nodeDescription.documentUri, content);
            if (!doc) {
                return undefined;
            }
           
        }
        return this.astNodeLocator.getAstNode(doc.parseResult.value, nodeDescription.path);
    }
}

seems to work as well.

[msujew]

Cool :)