From 9d6b1cb173998c82783c1751b8ce88d3d7243dc3 Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Thu, 9 May 2013 16:22:31 +0000
Subject: [PATCH] [doc parsing]: don't attempt to fix single character commands
 (\t \n are common). \\ rdar://12381408

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181517 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/AST/CommentCommandTraits.cpp        | 4 ++++
 test/Sema/warn-documentation-fixits.cpp | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/lib/AST/CommentCommandTraits.cpp b/lib/AST/CommentCommandTraits.cpp
index dc4744a53c..2b5e624fb7 100644
--- a/lib/AST/CommentCommandTraits.cpp
+++ b/lib/AST/CommentCommandTraits.cpp
@@ -49,6 +49,10 @@ HelperTypoCorrectCommandInfo(SmallVectorImpl<const CommandInfo *> &BestCommand,
   const unsigned MaxEditDistance = 1;
   unsigned BestEditDistance = MaxEditDistance + 1;
   StringRef Name = Command->Name;
+  // Don't attempt trying to typo fix single character commands.
+  // \t and \n are very common
+  if (Name.size() <= 1)
+    return;
   
   unsigned MinPossibleEditDistance = abs((int)Name.size() - (int)Typo.size());
   if (MinPossibleEditDistance > 0 &&
diff --git a/test/Sema/warn-documentation-fixits.cpp b/test/Sema/warn-documentation-fixits.cpp
index 707ecb362f..a5a477f66d 100644
--- a/test/Sema/warn-documentation-fixits.cpp
+++ b/test/Sema/warn-documentation-fixits.cpp
@@ -67,6 +67,9 @@ int FooBar();
 /// \fooba bbb IS_DOXYGEN_END
 int gorf();
 
+/// \t bbb IS_DOXYGEN_END
+int Bar();
+
 // CHECK: fix-it:"{{.*}}":{5:12-5:22}:"a"
 // CHECK: fix-it:"{{.*}}":{9:12-9:15}:"aaa"
 // CHECK: fix-it:"{{.*}}":{13:13-13:23}:"T"
-- 
2.40.0