1 files changed, 38 insertions, 0 deletions

diff --git a/editors/code/src/commands/syntaxTree.ts b/editors/code/src/commands/syntaxTree.ts
new file mode 100644
index 000000000..dcb721eee
--- /dev/null
+++ b/editors/code/src/commands/syntaxTree.ts
@@ -0,0 +1,38 @@
+import * as vscode from 'vscode';
+import { TextDocumentIdentifier } from 'vscode-languageclient';
+
+import { Server } from '../server';
+
+export const syntaxTreeUri = vscode.Uri.parse('ra-lsp://syntaxtree');
+
+export class TextDocumentContentProvider implements vscode.TextDocumentContentProvider {
+    public eventEmitter = new vscode.EventEmitter<vscode.Uri>();
+    public syntaxTree: string = 'Not available';
+
+    public provideTextDocumentContent(uri: vscode.Uri): vscode.ProviderResult<string> {
+        const editor = vscode.window.activeTextEditor;
+        if (editor == null) { return ''; }
+        const request: SyntaxTreeParams = {
+            textDocument: { uri: editor.document.uri.toString() },
+        };
+        return Server.client.sendRequest<SyntaxTreeResult>('m/syntaxTree', request);
+    }
+
+    get onDidChange(): vscode.Event<vscode.Uri> {
+        return this.eventEmitter.event;
+    }
+}
+
+interface SyntaxTreeParams {
+    textDocument: TextDocumentIdentifier;
+}
+
+type SyntaxTreeResult = string;
+
+// Opens the virtual file that will show the syntax tree
+//
+// The contents of the file come from the `TextDocumentContentProvider`
+export async function handle() {
+    const document = await vscode.workspace.openTextDocument(syntaxTreeUri);
+    return vscode.window.showTextDocument(document, vscode.ViewColumn.Two, true);
+}