Work in progress. 

An attempt to write a [Language Server Protocol](https://en.wikipedia.org/wiki/Language_Server_Protocol) server using XQuery 4.0 and the [BaseX websocket](https://docs.basex.org/main/WebSockets) feature.
## LSP Server
* `webapp/lsp` The LSP implementation in XQuery using WebSockets  for transport and the [JSON-RPC](https://www.jsonrpc.org/specification) 2.0 API for data format.
### Dev notes
State is held in websocket attributes.

|Name|Use|
|----|---|
|initized|set true after client sends intialized messag|
|files|A map whose keys are open uris, values are maps (doctype-> attribute name where doctype is stored| |
|file-{uuid}|name of websocket attribute with textDocument|
|parse-{uuid}|name of websocket attribute with parse tree XML|
## Sample html clients
### Using `CodeMirror6` https://codemirror.net/
* `webapp/static/codemirror` A test html page using the [CodeMirror6 editor](https://codemirror.net/)  that connects to the BaseX LSP instance

#### uses
* https://github.com/FurqanSoftware/codemirror-languageserver
* https://hjr265.me/blog/codemirror-lsp/
  
### Using `Ace Editor`
* `webapp/static/ace` A test html page using the [Ace editor](https://ace.c9.io/)  that connects to the BaseX LSP instance

#### Uses
* https://github.com/mkslanc/ace-linters https://mkslanc.github.io/ace-linters/

I needed `set NODE_OPTIONS=--max_old_space_size=8192` for build to complete

Or `node --max-old-space-size=8192 node_modules/webpack-dev-serve
r/bin/webpack-dev-server.js`


## Related links
java -cp org.eclipse.lemminx-uber.jar org.eclipse.lemminx.XMLServerSocketLauncher`


Make a websocket server for lsp on port 3000
https://mkslanc.github.io/ace-linters/websocket.html

http://localhost:3000/exampleServer

https://github.com/mkslanc/ace-linters/blob/c1b317e01299016ac7da6588361228637f4eac25/packages/demo/websockets-lsp/server/server.ts