Is it possible to write an extension which will do code analysis? I looked at the api and I didnt see how I can get all variables that are declared in the document/xref on specific variable and get it flow in the code. If someone know api in visual studio code which actually helps with it, it will be great.
Creating such an extension is certainly possible, however you have to do your own language processing. AFAIK there's no way to access the internal structures (syntax tree, symbol table etc.) of the existing JS/TS (or other language for that matter) extensions.
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I'm looking to improve my own productivity by trying to figure out how to provide cmd+click functionality for variables declared at runtime. I work with a library that allows you to register objects to it at runtime to be accessed later — it would be great if I could cmd+click to definitions of these! How do you think I could achieve this? I'm open to any ideas. Thanks!
Edit:
Thoughts I have so far inspired by feedback from various Slack communities:
There is no such thing as 'runtime' when providing functionality in IDEs
We need to be able to teach the IDE about what definitions to expect. Whether this means writing an extension to use the VS Code API specifically for my use-case, or otherwise working within a system that generates files that the IDE already knows to look for, which allows it to connect the dots and provide the precious peek / goto definition functionality
Edit:
I'm starting work on a VS Code extension that reads a dotfile for configuration — I'll share what I find out as I go!
I am totally new to creating extensions in VS Code, and all the official examples of extensions are written in Typescript/Javascript, which I have no experience with. Is it possible to create VS Code extensions in other languages, such as Python or C++?
If so, could anyone point me to any resources to get me started?
It is possible by creating a C++ module for Node.js, which can then be loaded like any other node module. Of course, some glue code written in JS or TS is necessary to register the extension and translate calls to/from vscode.
I've gone this way in my ANTLR4 extension, but gave up eventually, because of the troubles I had due to incompatible dependencies (you have to make sure the extension uses the exact same V8 version, which was used to build the underlying Node.js used by vscode, on all supported platforms).
This situation might have change, I don't know, but with that in the background I don't recommend it.
If you want to add support for a new language in vscode you can also write a separate language server, as is mentioned in the linked SO answer. For other type of work, I'm afraid, you have no alternative to use.
No, as #rioV8 said, since VSCode is an electron app and runs on Javascript.
Is it possible to interact with the CSharp syntax tree from my own VS code extension? I have an extension which I made in Visual Studio proper which uses the Roslyn Syntax Tree to do a variety of code editing and sorting tasks and I want to migrate it to VS Code.
My naive assumption is that if I can get access to the OmnisharpServer object by reaching into the Omnisharp VS Code Extension I might be able to pull the relevant information out of there. I can get access to the extension itself by calling:
let csextension = vscode.extensions.getExtension('ms-vscode.csharp')
But the extension itself doesn't expose much so I'm wondering if this is the correct methodology? If so, how do I get access to the running server from my own extension?
The only other strategy I have is to run a .net core exe which uses Roslyn to do the analysis, but this seems to be duplicating a problem which must be solved somewhere in the stack.
I don't think there's any way to do this without going through the Omnisharp VSCode Extension / its extension API (unless perhaps the server implements some custom interface). If an API doesn't already exist, you could consider creating a feature request on the issue tracker?
From my extension, how can I access the abstract syntax tree that VS Code has for the active file? I have been looking through the API docs but haven't been able to find anything. I also came across this SO question but both the question and answer are pretty opaque to me.
There's no thing like a common AST for files loaded into an editor. In fact, many file aren't even parsed at all, unless an extension is installed which does that.
The linked answer describes a way to implement language support (via a language server), which is not the same as getting a fictional AST from vscode.
I'm looking into what would be the best option to extend VS code with an extension which add some more features to the JSON Format such as additional keyword highlighting.
What would be the best approach ?
Taking over the tmlanguage file for JSON and add additional options for eg syntax highlighting connected to a new language ?
"Extending" the JSON fomat ?
Custom linter ?
This looks my best bet I could find till now: Can a language in Visual Studio Code be extended?
Tnx in advance for giving advice what would be the best approach.
It depends on what features do you want and how much time you would like to spend on it.
If the syntax highlighting is the main purpose, just get a tmLanguage file for the programming language and use the official generator yocode to create an extension from it.
Visual Studio Code and Microsoft behind it are promoting the Language Server Protocol which may be the ultimate solution. And of course, it requires much more work.