Multiple Files with Web-Editor(s)

[thomasbaar]

When an input model becomes larger, it is generally a good idea to spread the model across multiple files. In this case - of course - one has to design the language in a way that every single file can be parsed successfully.

When working with VSCode-Extensions, this might work nicely: All input files in the workspace with the right file suffix (e.g. .hello) are parsed and the information flow between different files is usually done via import-statements and a careful design of scope-rules for identifiers.

My question: Is there something similar available for web-editors? One of the most convincing arguments for migrating from Xtext to Langium is the direct integration into web technologies of the latter. However - as far I have seen - all examples and tutorial projects just have ONE web editor. I would just love to see an example for a DSL, whose input can be split across multiple files (or web editor instances). Is anything available in this direction?

Thanks in advance,
Thomas

[msujew]

Hey @thomasbaar,

this isn't really related to Langium (we provide just the language server after all), so you're better off asking in repos that provide such a client solution. See for example the monaco-languageclient library and their app playground. In general, as long as your client solution correctly interfaces with the language server protocol, Langium will deal with it correctly.

[ponyatov]

This question looks more generally as the question about multiple modules support in Langium. Something about

• sharing multi-tree AST to do cross-module checks
• autogenerating some sort of interface-specification files (*.i) which also include shared type definitions, function prototypes etc
  • *.i files in a common can be seen as some sort of typed API specification also includes de/serialization specs
  • *.i (like *.h in C/C++) can be used for more effective cross-module analysis as it specs other modules API but don't require to load them

[msujew]

Hey @ponyatov, I don't follow. Is this related to the web support? Langium supports multi-file workspaces and cross-file reference resolution out of the box.