diff --git a/src/ide_services/endpoints/unofficial.ts b/src/ide_services/endpoints/unofficial.ts
index 750b89e..c6bdde5 100644
--- a/src/ide_services/endpoints/unofficial.ts
+++ b/src/ide_services/endpoints/unofficial.ts
@@ -1,5 +1,5 @@
 import { applyCodeWithDiff, applyEditCodeWithDiff } from "../../handler/diffHandler";
-
+import * as vscode from 'vscode';
 
 export namespace UnofficialEndpoints {
     export async function diffApply(filepath: string, content: string, autoedit: boolean = false) {
@@ -19,4 +19,33 @@ export namespace UnofficialEndpoints {
 		const res = eval(evalCode);
 		return res;
 	}
+
+    export async function selectRange(fileName: string, startLine: number, startColumn: number, endLine: number, endColumn: number) {
+        let editor = vscode.window.activeTextEditor;
+        
+        // If the file is not open or not the active editor, open it
+        if (!editor || editor.document.fileName !== fileName) {
+            const document = await vscode.workspace.openTextDocument(fileName);
+            editor = await vscode.window.showTextDocument(document);
+        }
+        
+        if (editor) {
+            if (startLine === -1) {
+                // Cancel selection
+                editor.selection = new vscode.Selection(editor.selection.active, editor.selection.active);
+            } else {
+                // Select range
+                const selection = new vscode.Selection(
+                    new vscode.Position(startLine, startColumn),
+                    new vscode.Position(endLine, endColumn)
+                );
+                editor.selection = selection;
+                
+                // Reveal the selection
+                editor.revealRange(selection, vscode.TextEditorRevealType.InCenter);
+            }
+            return true;
+        }
+        return false;
+    }
 }
diff --git a/src/ide_services/services.ts b/src/ide_services/services.ts
index f70f81f..f97c27a 100644
--- a/src/ide_services/services.ts
+++ b/src/ide_services/services.ts
@@ -100,6 +100,10 @@ const functionRegistry: any = {
     "/get_collapsed_code": {
         keys: ["fileName", "startLine", "endLine"],
         handler: getCollapsedCode,
+    },
+    "/select_range": {
+        keys: ["fileName", "startLine", "startColumn", "endLine", "endColumn"],
+        handler: UnofficialEndpoints.selectRange,
     }
 };