1 files changed, 80 insertions, 0 deletions
diff --git a/Source/cmCMakePresetsFileInternal.h b/Source/cmCMakePresetsFileInternal.h
index f05b8ce..ffb6ce9 100644
--- a/Source/cmCMakePresetsFileInternal.h
+++ b/Source/cmCMakePresetsFileInternal.h
@@ -1,5 +1,7 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
+#include <memory>
+
 #include "cmCMakePresetsFile.h"
 
 #define CHECK_OK(expr)                                                        \
@@ -20,3 +22,81 @@ enum class ExpandMacroResult
 using MacroExpander = std::function<ExpandMacroResult(
   const std::string&, const std::string&, std::string&, int version)>;
 }
+
+class cmCMakePresetsFile::Condition
+{
+public:
+  virtual ~Condition() = default;
+
+  virtual bool Evaluate(
+    const std::vector<cmCMakePresetsFileInternal::MacroExpander>& expanders,
+    int version, cm::optional<bool>& out) const = 0;
+  virtual bool IsNull() const { return false; }
+};
+
+namespace cmCMakePresetsFileInternal {
+
+class NullCondition : public cmCMakePresetsFile::Condition
+{
+  bool Evaluate(const std::vector<MacroExpander>& /*expanders*/,
+                int /*version*/, cm::optional<bool>& out) const override
+  {
+    out = true;
+    return true;
+  }
+
+  bool IsNull() const override { return true; }
+};
+
+class ConstCondition : public cmCMakePresetsFile::Condition
+{
+public:
+  bool Evaluate(const std::vector<MacroExpander>& /*expanders*/,
+                int /*version*/, cm::optional<bool>& out) const override
+  {
+    out = this->Value;
+    return true;
+  }
+
+  bool Value;
+};
+
+class EqualsCondition : public cmCMakePresetsFile::Condition
+{
+public:
+  bool Evaluate(const std::vector<MacroExpander>& expanders, int version,
+                cm::optional<bool>& out) const override;
+
+  std::string Lhs;
+  std::string Rhs;
+};
+
+class InListCondition : public cmCMakePresetsFile::Condition
+{
+public:
+  bool Evaluate(const std::vector<MacroExpander>& expanders, int version,
+                cm::optional<bool>& out) const override;
+
+  std::string String;
+  std::vector<std::string> List;
+};
+
+class AnyAllOfCondition : public cmCMakePresetsFile::Condition
+{
+public:
+  bool Evaluate(const std::vector<MacroExpander>& expanders, int version,
+                cm::optional<bool>& out) const override;
+
+  std::vector<std::unique_ptr<Condition>> Conditions;
+  bool StopValue;
+};
+
+class NotCondition : public cmCMakePresetsFile::Condition
+{
+public:
+  bool Evaluate(const std::vector<MacroExpander>& expanders, int version,
+                cm::optional<bool>& out) const override;
+
+  std::unique_ptr<Condition> SubCondition;
+};
+}