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+//===--- UnwrappedLineFormatter.h - Format C++ code -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Implements a combinartorial exploration of all the different
+/// linebreaks unwrapped lines can be formatted in.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_FORMAT_UNWRAPPEDLINEFORMATTER_H
+#define LLVM_CLANG_LIB_FORMAT_UNWRAPPEDLINEFORMATTER_H
+
+#include "ContinuationIndenter.h"
+#include "clang/Format/Format.h"
+#include <map>
+
+namespace clang {
+namespace format {
+
+class ContinuationIndenter;
+class WhitespaceManager;
+
+class UnwrappedLineFormatter {
+public:
+  UnwrappedLineFormatter(ContinuationIndenter *Indenter,
+                         WhitespaceManager *Whitespaces,
+                         const FormatStyle &Style,
+                         const AdditionalKeywords &Keywords,
+                         const SourceManager &SourceMgr,
+                         FormattingAttemptStatus *Status)
+      : Indenter(Indenter), Whitespaces(Whitespaces), Style(Style),
+        Keywords(Keywords), SourceMgr(SourceMgr), Status(Status) {}
+
+  /// Format the current block and return the penalty.
+  unsigned format(const SmallVectorImpl<AnnotatedLine *> &Lines,
+                  bool DryRun = false, int AdditionalIndent = 0,
+                  bool FixBadIndentation = false, unsigned FirstStartColumn = 0,
+                  unsigned NextStartColumn = 0, unsigned LastStartColumn = 0);
+
+private:
+  /// Add a new line and the required indent before the first Token
+  /// of the \c UnwrappedLine if there was no structural parsing error.
+  void formatFirstToken(const AnnotatedLine &Line,
+                        const AnnotatedLine *PreviousLine,
+                        const SmallVectorImpl<AnnotatedLine *> &Lines,
+                        unsigned Indent, unsigned NewlineIndent);
+
+  /// Returns the column limit for a line, taking into account whether we
+  /// need an escaped newline due to a continued preprocessor directive.
+  unsigned getColumnLimit(bool InPPDirective,
+                          const AnnotatedLine *NextLine) const;
+
+  // Cache to store the penalty of formatting a vector of AnnotatedLines
+  // starting from a specific additional offset. Improves performance if there
+  // are many nested blocks.
+  std::map<std::pair<const SmallVectorImpl<AnnotatedLine *> *, unsigned>,
+           unsigned>
+      PenaltyCache;
+
+  ContinuationIndenter *Indenter;
+  WhitespaceManager *Whitespaces;
+  const FormatStyle &Style;
+  const AdditionalKeywords &Keywords;
+  const SourceManager &SourceMgr;
+  FormattingAttemptStatus *Status;
+};
+} // end namespace format
+} // end namespace clang
+
+#endif // LLVM_CLANG_LIB_FORMAT_UNWRAPPEDLINEFORMATTER_H