Merge pull request #4 from x1unix/feat/support-wasm

feat: introduce connector for js/wasm

cmd/cmd.go

@@ -18,11 +18,11 @@ func GnoplsCmd() *cobra.Command {
 		SilenceUsage:       true,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			slog.Info("Initializing Server...")
-			env := &env.Env{
+			procEnv := &env.Env{
 				GNOROOT: os.Getenv("GNOROOT"),
 				GNOHOME: env.GnoHome(),
 			}
-			err := lsp.RunServer(cmd.Context(), env)
+			err := lsp.RunServer(cmd.Context(), procEnv)
 			if err != nil {
 				return err
 			}

internal/env/conn_js.go

@@ -0,0 +1,12 @@
+package env
+
+import (
+	"context"
+	"net"
+
+	"github.com/gnolang/gnopls/internal/js"
+)
+
+func GetConnection(ctx context.Context) (net.Conn, error) {
+	return js.DialHost(ctx)
+}

internal/env/conn_other.go

@@ -0,0 +1,15 @@
+//go:build !js
+
+package env
+
+import (
+	"context"
+	"net"
+	"os"
+
+	"go.lsp.dev/pkg/fakenet"
+)
+
+func GetConnection(_ context.Context) (net.Conn, error) {
+	return fakenet.NewConn("stdio", os.Stdin, os.Stdout), nil
+}

internal/js/conn_js.go

@@ -0,0 +1,22 @@
+// Package js provides primitives to integrate language server with javascript environments such as browsers and Node.
+package js
+
+import (
+	"context"
+	"net"
+
+	"go.lsp.dev/pkg/fakenet"
+)
+
+// DialHost registers LSP message listener in JavaScript host and returns connection to use by LSP server.
+//
+// This function should be called only once before starting LSP server.
+func DialHost(ctx context.Context) (net.Conn, error) {
+	reader, err := registerRequestListener(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	conn := fakenet.NewConn("js", reader, messageWriter)
+	return conn, nil
+}

internal/js/example/.gitignore

@@ -0,0 +1,4 @@
+node_modules
+.DS_Store
+.vscode
+.idea

internal/js/example/README.md

@@ -0,0 +1,14 @@
+# Gnopls Embedding Example
+
+This directory contains a bare-minimum code to integrate Gnopls as a WebAssembly module
+into browser or Node.js environment.
+
+This example omits such nuances as editor integration or file system support and focuses just on basics.
+
+## Prerequisites
+
+* Copy `wasm_exec.js` file using following command:
+    * `cp $(go env GOROOT)/misc/wasm/wasm_exec.js .`
+* Build gnopls as a WebAssembly file for JavaScript environment:
+    * `GOOS=js GOARCH=wasm make build`
+* Modify paths to `wasm_exec.js` and WASM file in [worker.ts](./worker.ts) file.

internal/js/example/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "example",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@types/golang-wasm-exec": "^1.15.2",
+    "comlink": "^4.4.1",
+    "monaco-languageclient": "^8.7.0",
+    "vscode-languageclient": "^9.0.1",
+    "vscode-languageserver-protocol": "^3.17.5"
+  }
+}