1 files changed, 22 insertions, 0 deletions

diff --git a/lib/Support/StringExtras.cpp b/lib/Support/StringExtras.cpp
index c72f12165343..1b233ab200ae 100644
--- a/lib/Support/StringExtras.cpp
+++ b/lib/Support/StringExtras.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/SmallVector.h"
 #include <cstring>
 using namespace llvm;
 
@@ -56,3 +57,24 @@ void llvm::SplitString(const std::string &Source,
     S2 = getToken(S, Delimiters);
   }
 }
+
+void llvm::StringRef::split(SmallVectorImpl<StringRef> &A,
+                            StringRef Separators, int MaxSplit,
+                            bool KeepEmpty) const {
+  StringRef rest = *this;
+
+  // rest.data() is used to distinguish cases like "a," that splits into
+  // "a" + "" and "a" that splits into "a" + 0.
+  for (int splits = 0;
+       rest.data() != NULL && (MaxSplit < 0 || splits < MaxSplit);
+       ++splits) {
+    std::pair<llvm::StringRef, llvm::StringRef> p = rest.split(Separators);
+
+    if (p.first.size() != 0 || KeepEmpty)
+      A.push_back(p.first);
+    rest = p.second;
+  }
+  // If we have a tail left, add it.
+  if (rest.data() != NULL && (rest.size() != 0 || KeepEmpty))
+    A.push_back(rest);
+}