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diff --git a/xbmc/guilib/GUIIncludes.h b/xbmc/guilib/GUIIncludes.h
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+++ b/xbmc/guilib/GUIIncludes.h
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+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include "interfaces/info/InfoBool.h"
+
+#include <map>
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+// forward definitions
+class TiXmlElement;
+namespace INFO
+{
+  class CSkinVariableString;
+}
+
+class CGUIIncludes
+{
+public:
+  CGUIIncludes();
+  ~CGUIIncludes();
+
+  /*!
+   \brief Clear all include components (defaults, constants, variables, expressions and includes)
+  */
+  void Clear();
+
+  /*!
+   \brief Load all include components(defaults, constants, variables, expressions and includes)
+   from the main entrypoint \code{file}. Flattens nested expressions and expressions in variable
+   conditions after loading all other included files.
+
+   \param file the file to load
+  */
+  void Load(const std::string &file);
+
+  /*!
+   \brief Resolve all include components (defaults, constants, variables, expressions and includes)
+   for the given \code{node}. Place the conditions specified for <include> elements in \code{includeConditions}.
+
+   \param node the node from where we start to resolve the include components
+   \param includeConditions a map that holds the conditions for resolved includes
+   */
+  void Resolve(TiXmlElement *node, std::map<INFO::InfoPtr, bool>* includeConditions = NULL);
+
+  /*!
+   \brief Create a skin variable for the given \code{name} within the given \code{context}.
+
+   \param name the name of the skin variable
+   \param context the context where the variable is created in
+   \return skin variable
+   */
+  const INFO::CSkinVariableString* CreateSkinVariable(const std::string& name, int context);
+
+private:
+  enum ResolveParamsResult
+  {
+    NO_PARAMS_FOUND,
+    PARAMS_RESOLVED,
+    SINGLE_UNDEFINED_PARAM_RESOLVED
+  };
+
+  /*!
+   \brief Load all include components (defaults, constants, variables, expressions and includes)
+   from the given \code{file}.
+
+   \param file the file to load
+   \return true if the file was loaded otherwise false
+  */
+  bool Load_Internal(const std::string &file);
+
+  bool HasLoaded(const std::string &file) const;
+
+  void LoadDefaults(const TiXmlElement *node);
+  void LoadIncludes(const TiXmlElement *node);
+  void LoadVariables(const TiXmlElement *node);
+  void LoadConstants(const TiXmlElement *node);
+  void LoadExpressions(const TiXmlElement *node);
+
+  /*!
+   \brief Resolve all expressions containing other expressions to a single evaluatable expression.
+  */
+  void FlattenExpressions();
+
+  /*!
+   \brief Expand any expressions nested in this expression.
+
+   \param expression the expression to flatten
+   \param resolved list of already evaluated expression names, to avoid expanding circular references
+  */
+  void FlattenExpression(std::string &expression, const std::vector<std::string> &resolved);
+
+  /*!
+   \brief Resolve all variable conditions containing expressions to a single evaluatable condition.
+  */
+  void FlattenSkinVariableConditions();
+
+  void SetDefaults(TiXmlElement *node);
+  void ResolveIncludes(TiXmlElement *node, std::map<INFO::InfoPtr, bool>* xmlIncludeConditions = NULL);
+  void ResolveConstants(TiXmlElement *node);
+  void ResolveExpressions(TiXmlElement *node);
+
+  typedef std::map<std::string, std::string> Params;
+  static void InsertNested(TiXmlElement* controls, TiXmlElement* include, TiXmlElement* node);
+  static bool GetParameters(const TiXmlElement *include, const char *valueAttribute, Params& params);
+  static void ResolveParametersForNode(TiXmlElement *node, const Params& params);
+  static ResolveParamsResult ResolveParameters(const std::string& strInput, std::string& strOutput, const Params& params);
+
+  std::string ResolveConstant(const std::string &constant) const;
+  std::string ResolveExpressions(const std::string &expression) const;
+
+  std::vector<std::string> m_files;
+  std::map<std::string, std::pair<TiXmlElement, Params>> m_includes;
+  std::map<std::string, TiXmlElement> m_defaults;
+  std::map<std::string, TiXmlElement> m_skinvariables;
+  std::map<std::string, std::string> m_constants;
+  std::map<std::string, std::string> m_expressions;
+
+  std::set<std::string> m_constantAttributes;
+  std::set<std::string> m_constantNodes;
+
+  std::set<std::string> m_expressionAttributes;
+  std::set<std::string> m_expressionNodes;
+};