Add convenient helper to get suffix of the file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47397 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/Path.h

@@ -266,6 +266,14 @@ namespace sys {
       /// @brief Get the base name of the path
       std::string getBasename() const;
 
+      /// This function strips off the path and basename(up to and
+      /// including the last dot) of the file or directory name and
+      /// returns just the suffix. For example /a/foo.bar would cause
+      /// this function to return "bar".
+      /// @returns std::string containing the suffix of the path
+      /// @brief Get the suffix of the path
+      std::string getSuffix() const;
+
       /// Obtain a 'C' string for the path name.
       /// @returns a 'C' string containing the path name.
       /// @brief Returns the path as a C string.

lib/System/Path.cpp

@@ -172,7 +172,10 @@ bool Path::hasMagicNumber(const std::string &Magic) const {
   return false;
 }
 
-
+std::string
+Path::getSuffix() const {
+  return path.substr(path.rfind('.') + 1);
+}
 
 // Include the truly platform-specific parts of this class.
 #if defined(LLVM_ON_UNIX)