Support for multiple projects within a workspace

[we-wake-act21]

I am working on incorporating support for multiple projects within a single workspace, ensuring that the scopes of one project remain isolated from others.

Currently, a project is identified by the location of a specific project file (project.project).

In the provided figure, you can observe that new_test_project and project are distinct projects coexisting within the same workspace named Examples.

To achieve this, I am seeking guidance on the most effective approach for implementation.

[msujew]

Hey @we-wake-act21,

this should be relatively straightforward, assuming you have a good way of identifying which file belongs to a given workspace. You will need to override the global scope computation:

langium/packages/langium/src/references/scope-provider.ts

Lines 100 to 102 in 728b579

	protected getGlobalScope(referenceType: string, _context: ReferenceInfo): Scope {
	return this.globalScopeCache.get(referenceType, () => new MapScope(this.indexManager.allElements(referenceType)));
	}

in a custom scope provider and return a dedicated, filtered scope based on the current project. You can find the currently scoped document via the context argument.

Note that the current scope provider + index manager is heavily optimized towards a single global scope. You might run into performance issues, if you don't take care of stuff like caching etc.