[clang-tdiy] Add header file extension configuration support.

Summary: * Add a `HeaderFileExtensions` check option in misc-definitions-in-headers, google-build-namespaces and google-global-names-in-headers.

Reviewers: aaron.ballman, alexfh

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D16113

llvm-svn: 259879

1 files changed, 13 insertions, 1 deletions

diff --git a/clang-tools-extra/clang-tidy/ClangTidy.cpp b/clang-tools-extra/clang-tidy/ClangTidy.cpp
index 66ab56a77a1..b2dd7e7c74f 100644
--- a/clang-tools-extra/clang-tidy/ClangTidy.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidy.cpp
@@ -344,13 +344,25 @@ OptionsView::OptionsView(StringRef CheckName,
                          const ClangTidyOptions::OptionMap &CheckOptions)
     : NamePrefix(CheckName.str() + "."), CheckOptions(CheckOptions) {}
 
-std::string OptionsView::get(StringRef LocalName, std::string Default) const {
+std::string OptionsView::get(StringRef LocalName, StringRef Default) const {
   const auto &Iter = CheckOptions.find(NamePrefix + LocalName.str());
   if (Iter != CheckOptions.end())
     return Iter->second;
   return Default;
 }
 
+std::string OptionsView::getLocalOrGlobal(StringRef LocalName,
+                                          StringRef Default) const {
+  auto Iter = CheckOptions.find(NamePrefix + LocalName.str());
+  if (Iter != CheckOptions.end())
+    return Iter->second;
+  // Fallback to global setting, if present.
+  Iter = CheckOptions.find(LocalName.str());
+  if (Iter != CheckOptions.end())
+    return Iter->second;
+  return Default;
+}
+
 void OptionsView::store(ClangTidyOptions::OptionMap &Options,
                         StringRef LocalName, StringRef Value) const {
   Options[NamePrefix + LocalName.str()] = Value;