1 files changed, 85 insertions, 0 deletions
diff --git a/Source/cmWindowsRegistry.h b/Source/cmWindowsRegistry.h
new file mode 100644
index 0000000..bb9090e
--- /dev/null
+++ b/Source/cmWindowsRegistry.h
@@ -0,0 +1,85 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <cm/optional>
+#include <cm/string_view>
+#include <cmext/enum_set>
+#include <cmext/string_view>
+
+class cmMakefile;
+
+class cmWindowsRegistry
+{
+public:
+  enum class View
+  {
+    Both,
+    Target,
+    Host,
+    Reg64_32,
+    Reg32_64,
+    Reg32,
+    Reg64
+  };
+
+  // Registry supported types
+  enum class ValueType : std::uint8_t
+  {
+    Reg_SZ,
+    Reg_EXPAND_SZ,
+    Reg_MULTI_SZ,
+    Reg_DWORD,
+    Reg_QWORD
+  };
+  using ValueTypeSet = cm::enum_set<ValueType>;
+
+  // All types as defined by enum ValueType
+  static const ValueTypeSet AllTypes;
+  // same as AllTYpes but without type REG_MULTI_SZ
+  static const ValueTypeSet SimpleTypes;
+
+  cmWindowsRegistry(cmMakefile&,
+                    const ValueTypeSet& supportedTypes = AllTypes);
+
+  // Helper routine to convert string to enum value
+  static cm::optional<View> ToView(cm::string_view name);
+  // Helper routine to convert enum to string
+  static cm::string_view FromView(View view);
+
+  cm::optional<std::string> ReadValue(cm::string_view key,
+                                      View view = View::Both,
+                                      cm::string_view separator = "\0"_s)
+  {
+    return this->ReadValue(key, ""_s, view, separator);
+  }
+  cm::optional<std::string> ReadValue(cm::string_view key,
+                                      cm::string_view name,
+                                      View view = View::Both,
+                                      cm::string_view separator = "\0"_s);
+
+  cm::optional<std::vector<std::string>> GetValueNames(cm::string_view key,
+                                                       View view = View::Both);
+  cm::optional<std::vector<std::string>> GetSubKeys(cm::string_view key,
+                                                    View view = View::Both);
+
+  // Expand an expression which may contains multiple references
+  // to registry keys.
+  // Depending of the view specified, one or two expansions can be done.
+  cm::optional<std::vector<std::string>> ExpandExpression(
+    cm::string_view expression, View view, cm::string_view separator = "\0"_s);
+
+  cm::string_view GetLastError() const;
+
+private:
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  std::vector<View> ComputeViews(View view);
+
+  int TargetSize = 0;
+  ValueTypeSet SupportedTypes = AllTypes;
+#endif
+  std::string LastError;
+};