From f9fd365215485c0cde299d086fdf3669c7129caf Mon Sep 17 00:00:00 2001
From: steveluc <steveluc@microsoft.com>
Date: Mon, 2 Mar 2015 16:31:51 -0800
Subject: [PATCH] Added logic to handle requests for changes past the end of
 the buffer.

---
 src/server/editorServices.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 49a1ac4784c..5c85cfcaac5 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -1259,7 +1259,7 @@ module ts.server {
 
         getText(rangeStart: number, rangeLength: number) {
             var accum = "";
-            if (rangeLength > 0) {
+            if ((rangeLength > 0) && (rangeStart < this.root.charCount())) {
                 this.walk(rangeStart, rangeLength, {
                     goSubtree: true,
                     done: false,
@@ -1322,14 +1322,14 @@ module ts.server {
                 }
                 else if (pos >= this.root.charCount()) {
                     // insert at end
-                    var endString = this.getText(pos - 1, 1);
+                    pos = this.root.charCount() - 1;
+                    var endString = this.getText(pos, 1);
                     if (newText) {
                         newText = endString + newText;
                     }
                     else {
                         newText = endString;
                     }
-                    pos = pos - 1;
                     deleteLength = 0;
                     walker.suppressTrailingText = true;
                 }