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diff --git a/Source/CTest/cmCTestSVN.h b/Source/CTest/cmCTestSVN.h
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+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmCTestSVN_h
+#define cmCTestSVN_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cmCTestGlobalVC.h"
+
+#include <iosfwd>
+#include <list>
+#include <string>
+#include <vector>
+
+class cmCTest;
+class cmXMLWriter;
+
+/** \class cmCTestSVN
+ * \brief Interaction with subversion command-line tool
+ *
+ */
+class cmCTestSVN : public cmCTestGlobalVC
+{
+public:
+  /** Construct with a CTest instance and update log stream.  */
+  cmCTestSVN(cmCTest* ctest, std::ostream& log);
+
+  ~cmCTestSVN() override;
+
+private:
+  // Implement cmCTestVC internal API.
+  void CleanupImpl() override;
+  bool NoteOldRevision() override;
+  bool NoteNewRevision() override;
+  bool UpdateImpl() override;
+
+  bool RunSVNCommand(std::vector<char const*> const& parameters,
+                     OutputParser* out, OutputParser* err);
+
+  // Information about an SVN repository (root repository or external)
+  struct SVNInfo
+  {
+
+    SVNInfo(std::string const& path = std::string())
+      : LocalPath(path)
+    {
+    }
+    // Remove base from the filename
+    std::string BuildLocalPath(std::string const& path) const;
+
+    // LocalPath relative to the main source directory.
+    std::string LocalPath;
+
+    // URL of repository directory checked out in the working tree.
+    std::string URL;
+
+    // URL of repository root directory.
+    std::string Root;
+
+    // Directory under repository root checked out in working tree.
+    std::string Base;
+
+    // Old and new repository revisions.
+    std::string OldRevision;
+    std::string NewRevision;
+  };
+
+  // Extended revision structure to include info about external it refers to.
+  struct Revision;
+
+  friend struct Revision;
+
+  // Info of all the repositories (root, externals and nested ones).
+  // Use std::list so the elements don't move in memory.
+  std::list<SVNInfo> Repositories;
+
+  // Pointer to the infos of the root repository.
+  SVNInfo* RootInfo;
+
+  std::string LoadInfo(SVNInfo& svninfo);
+  bool LoadRepositories();
+  bool LoadModifications() override;
+  bool LoadRevisions() override;
+  bool LoadRevisions(SVNInfo& svninfo);
+
+  void GuessBase(SVNInfo& svninfo, std::vector<Change> const& changes);
+
+  void DoRevisionSVN(Revision const& revision,
+                     std::vector<Change> const& changes);
+
+  void WriteXMLGlobal(cmXMLWriter& xml) override;
+
+  class ExternalParser;
+  // Parsing helper classes.
+  class InfoParser;
+  class LogParser;
+  class StatusParser;
+  class UpdateParser;
+
+  friend class InfoParser;
+  friend class LogParser;
+  friend class StatusParser;
+  friend class UpdateParser;
+  friend class ExternalParser;
+};
+
+#endif