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diff --git a/Source/cmGeneratorExpressionEvaluator.h b/Source/cmGeneratorExpressionEvaluator.h
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@@ -0,0 +1,131 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2012 Stephen Kelly <steveire@gmail.com>
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmGeneratorExpressionEvaluator_h
+#define cmGeneratorExpressionEvaluator_h
+
+#include <vector>
+#include <string>
+
+#include "cmListFileCache.h"
+#include "cmGeneratorExpressionContext.h"
+
+class cmTarget;
+
+struct cmGeneratorExpressionDAGChecker;
+struct cmGeneratorExpressionNode;
+
+//----------------------------------------------------------------------------
+struct cmGeneratorExpressionEvaluator
+{
+  cmGeneratorExpressionEvaluator() {}
+  virtual ~cmGeneratorExpressionEvaluator() {}
+
+  enum Type
+  {
+    Text,
+    Generator
+  };
+
+  virtual Type GetType() const = 0;
+
+  virtual std::string Evaluate(cmGeneratorExpressionContext *context,
+                              cmGeneratorExpressionDAGChecker *) const = 0;
+
+private:
+  cmGeneratorExpressionEvaluator(const cmGeneratorExpressionEvaluator &);
+  void operator=(const cmGeneratorExpressionEvaluator &);
+};
+
+struct TextContent : public cmGeneratorExpressionEvaluator
+{
+  TextContent(const char *start, size_t length)
+    : Content(start), Length(length)
+  {
+
+  }
+
+  std::string Evaluate(cmGeneratorExpressionContext *,
+                       cmGeneratorExpressionDAGChecker *) const
+  {
+    return std::string(this->Content, this->Length);
+  }
+
+  Type GetType() const
+  {
+    return cmGeneratorExpressionEvaluator::Text;
+  }
+
+  void Extend(size_t length)
+  {
+    this->Length += length;
+  }
+
+  size_t GetLength()
+  {
+    return this->Length;
+  }
+
+private:
+  const char *Content;
+  size_t Length;
+};
+
+//----------------------------------------------------------------------------
+struct GeneratorExpressionContent : public cmGeneratorExpressionEvaluator
+{
+  GeneratorExpressionContent(const char *startContent, size_t length);
+  void SetIdentifier(std::vector<cmGeneratorExpressionEvaluator*> identifier)
+  {
+    this->IdentifierChildren = identifier;
+  }
+
+  void SetParameters(
+        std::vector<std::vector<cmGeneratorExpressionEvaluator*> > parameters)
+  {
+    this->ParamChildren = parameters;
+  }
+
+  Type GetType() const
+  {
+    return cmGeneratorExpressionEvaluator::Generator;
+  }
+
+  std::string Evaluate(cmGeneratorExpressionContext *context,
+                       cmGeneratorExpressionDAGChecker *) const;
+
+  std::string GetOriginalExpression() const;
+
+  ~GeneratorExpressionContent();
+
+private:
+  std::string EvaluateParameters(const cmGeneratorExpressionNode *node,
+                                 const std::string &identifier,
+                                 cmGeneratorExpressionContext *context,
+                                 cmGeneratorExpressionDAGChecker *dagChecker,
+                                 std::vector<std::string> &parameters) const;
+
+  std::string ProcessArbitraryContent(
+    const cmGeneratorExpressionNode *node,
+    const std::string &identifier,
+    cmGeneratorExpressionContext *context,
+    cmGeneratorExpressionDAGChecker *dagChecker,
+    std::vector<std::vector<cmGeneratorExpressionEvaluator*> >::const_iterator
+    pit) const;
+
+private:
+  std::vector<cmGeneratorExpressionEvaluator*> IdentifierChildren;
+  std::vector<std::vector<cmGeneratorExpressionEvaluator*> > ParamChildren;
+  const char *StartContent;
+  size_t ContentLength;
+};
+
+#endif