From f400e5955af718a1ebb50745d629dcf1500ac7f3 Mon Sep 17 00:00:00 2001
From: Cyrus Najmabadi <cyrusn@microsoft.com>
Date: Wed, 10 Dec 2014 13:19:01 -0800
Subject: [PATCH] Don't call into the incremental parser for now.

Return a tree if the textChangeRange is empty.
---
 src/compiler/parser.ts   | 6 +++++-
 src/services/services.ts | 7 ++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index c8149a6cc95..7f6918c54fc 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -1180,12 +1180,16 @@ module ts {
         }
 
         function update(newText: string, textChangeRange: TextChangeRange) {
+            if (textChangeRange.isUnchanged()) {
+                // if the text didn't change, then we can just return our current source file as-is.
+                return sourceFile;
+            }
+
             // Don't pass along the text change range for now. We'll pass it along once incremental
             // parsing is enabled.
             return parseSourceFile(newText, /*textChangeRange:*/ undefined, /*setNodeParents*/ true);
         }
 
-
         function setContextFlag(val: Boolean, flag: ParserContextFlags) {
             if (val) {
                 contextFlags |= flag;
diff --git a/src/services/services.ts b/src/services/services.ts
index 856e4cb2c9a..93545fdaf8d 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1711,9 +1711,10 @@ module ts {
         // incrementally parse this file.
         if (textChangeRange) {
             if (version !== sourceFile.version || isOpen != sourceFile.isOpen) {
-                var newSourceFile = sourceFile.update(scriptSnapshot.getText(0, scriptSnapshot.getLength()), textChangeRange);
-                setSourceFileFields(newSourceFile, scriptSnapshot, version, isOpen);
-                return newSourceFile;
+                // Once incremental parsing is ready, then just call into this function.
+                // var newSourceFile = sourceFile.update(scriptSnapshot.getText(0, scriptSnapshot.getLength()), textChangeRange);
+                // setSourceFileFields(newSourceFile, scriptSnapshot, version, isOpen);
+                // return newSourceFile;
             }
         }