[ADT] Add edit_distance_insensitive to StringRef

In some instances its advantageous to calculate edit distances without worrying about casing.
Currently to achieve this both strings need to be converted to the same case first, then edit distance can be calculated.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D126159

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Support/StringRef.cpp b/llvm/lib/Support/StringRef.cpp
index 3ed08ed..096b2d2 100644
--- a/llvm/lib/Support/StringRef.cpp
+++ b/llvm/lib/Support/StringRef.cpp
@@ -98,6 +98,13 @@ unsigned StringRef::edit_distance(llvm::StringRef Other,
       AllowReplacements, MaxEditDistance);
 }
 
+unsigned llvm::StringRef::edit_distance_insensitive(
+    StringRef Other, bool AllowReplacements, unsigned MaxEditDistance) const {
+  return llvm::ComputeMappedEditDistance(
+      makeArrayRef(data(), size()), makeArrayRef(Other.data(), Other.size()),
+      llvm::toLower, AllowReplacements, MaxEditDistance);
+}
+
 //===----------------------------------------------------------------------===//
 // String Operations
 //===----------------------------------------------------------------------===//