Vendor import of clang release_34 branch r197841 (effectively, 3.4 RC3):

https://llvm.org/svn/llvm-project/cfe/branches/release_34@197841

1 files changed, 43 insertions, 0 deletions

diff --git a/lib/AST/CommentCommandTraits.cpp b/lib/AST/CommentCommandTraits.cpp
index e24d542..01bd12e 100644
--- a/lib/AST/CommentCommandTraits.cpp
+++ b/lib/AST/CommentCommandTraits.cpp
@@ -43,6 +43,49 @@ const CommandInfo *CommandTraits::getCommandInfo(unsigned CommandID) const {
   return getRegisteredCommandInfo(CommandID);
 }
 
+static void
+HelperTypoCorrectCommandInfo(SmallVectorImpl<const CommandInfo *> &BestCommand,
+                             StringRef Typo, const CommandInfo *Command) {
+  const unsigned MaxEditDistance = 1;
+  unsigned BestEditDistance = MaxEditDistance + 1;
+  StringRef Name = Command->Name;
+  
+  unsigned MinPossibleEditDistance = abs((int)Name.size() - (int)Typo.size());
+  if (MinPossibleEditDistance > 0 &&
+      Typo.size() / MinPossibleEditDistance < 1)
+    return;
+  unsigned EditDistance = Typo.edit_distance(Name, true, MaxEditDistance);
+  if (EditDistance > MaxEditDistance)
+    return;
+  if (EditDistance == BestEditDistance)
+    BestCommand.push_back(Command);
+  else if (EditDistance < BestEditDistance) {
+    BestCommand.clear();
+    BestCommand.push_back(Command);
+    BestEditDistance = EditDistance;
+  }
+}
+
+const CommandInfo *
+CommandTraits::getTypoCorrectCommandInfo(StringRef Typo) const {
+  // single character command impostures, such as \t or \n must not go
+  // through the fixit logic.
+  if (Typo.size() <= 1)
+    return NULL;
+  
+  SmallVector<const CommandInfo *, 2> BestCommand;
+  
+  const int NumOfCommands = llvm::array_lengthof(Commands);
+  for (int i = 0; i < NumOfCommands; i++)
+    HelperTypoCorrectCommandInfo(BestCommand, Typo, &Commands[i]);
+  
+  for (unsigned i = 0, e = RegisteredCommands.size(); i != e; ++i)
+    if (!RegisteredCommands[i]->IsUnknownCommand)
+      HelperTypoCorrectCommandInfo(BestCommand, Typo, RegisteredCommands[i]);
+  
+  return (BestCommand.size() != 1) ? NULL : BestCommand[0];
+}
+
 CommandInfo *CommandTraits::createCommandInfoWithName(StringRef CommandName) {
   char *Name = Allocator.Allocate<char>(CommandName.size() + 1);
   memcpy(Name, CommandName.data(), CommandName.size());