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diff --git a/lib/Format/AffectedRangeManager.h b/lib/Format/AffectedRangeManager.h
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+//===--- AffectedRangeManager.h - Format C++ code ---------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief AffectedRangeManager class manages affected ranges in the code.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_FORMAT_AFFECTEDRANGEMANAGER_H
+#define LLVM_CLANG_LIB_FORMAT_AFFECTEDRANGEMANAGER_H
+
+#include "clang/Basic/SourceManager.h"
+
+namespace clang {
+namespace format {
+
+struct FormatToken;
+class AnnotatedLine;
+
+class AffectedRangeManager {
+public:
+  AffectedRangeManager(const SourceManager &SourceMgr,
+                       const ArrayRef<CharSourceRange> Ranges)
+      : SourceMgr(SourceMgr), Ranges(Ranges.begin(), Ranges.end()) {}
+
+  // Determines which lines are affected by the SourceRanges given as input.
+  // Returns \c true if at least one line between I and E or one of their
+  // children is affected.
+  bool computeAffectedLines(SmallVectorImpl<AnnotatedLine *>::iterator I,
+                            SmallVectorImpl<AnnotatedLine *>::iterator E);
+
+  // Returns true if 'Range' intersects with one of the input ranges.
+  bool affectsCharSourceRange(const CharSourceRange &Range);
+
+private:
+  // Returns true if the range from 'First' to 'Last' intersects with one of the
+  // input ranges.
+  bool affectsTokenRange(const FormatToken &First, const FormatToken &Last,
+                         bool IncludeLeadingNewlines);
+
+  // Returns true if one of the input ranges intersect the leading empty lines
+  // before 'Tok'.
+  bool affectsLeadingEmptyLines(const FormatToken &Tok);
+
+  // Marks all lines between I and E as well as all their children as affected.
+  void markAllAsAffected(SmallVectorImpl<AnnotatedLine *>::iterator I,
+                         SmallVectorImpl<AnnotatedLine *>::iterator E);
+
+  // Determines whether 'Line' is affected by the SourceRanges given as input.
+  // Returns \c true if line or one if its children is affected.
+  bool nonPPLineAffected(AnnotatedLine *Line,
+                         const AnnotatedLine *PreviousLine);
+
+  const SourceManager &SourceMgr;
+  const SmallVector<CharSourceRange, 8> Ranges;
+};
+
+} // namespace format
+} // namespace clang
+
+#endif // LLVM_CLANG_LIB_FORMAT_AFFECTEDRANGEMANAGER_H