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diff --git a/xfa/fxfa/fm2js/xfa_expression.h b/xfa/fxfa/fm2js/xfa_expression.h
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+++ b/xfa/fxfa/fm2js/xfa_expression.h
@@ -0,0 +1,191 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FXFA_FM2JS_XFA_EXPRESSION_H_
+#define XFA_FXFA_FM2JS_XFA_EXPRESSION_H_
+
+#include <memory>
+
+#include "xfa/fxfa/fm2js/xfa_simpleexpression.h"
+
+enum XFA_FM_EXPTYPE {
+  XFA_FM_EXPTYPE_UNKNOWN,
+  XFA_FM_EXPTYPE_FUNC,
+  XFA_FM_EXPTYPE_VAR,
+  XFA_FM_EXPTYPE_EXP,
+  XFA_FM_EXPTYPE_BLOCK,
+  XFA_FM_EXPTYPE_IF,
+  XFA_FM_EXPTYPE_BREAK,
+  XFA_FM_EXPTYPE_CONTINUE,
+};
+
+class CXFA_FMExpression {
+ public:
+  explicit CXFA_FMExpression(FX_DWORD line);
+  CXFA_FMExpression(FX_DWORD line, XFA_FM_EXPTYPE type);
+  virtual ~CXFA_FMExpression() {}
+  virtual void ToJavaScript(CFX_WideTextBuf& javascript);
+  virtual void ToImpliedReturnJS(CFX_WideTextBuf&);
+  FX_DWORD GetLine() { return m_line; }
+  XFA_FM_EXPTYPE GetExpType() const { return m_type; }
+
+ protected:
+  XFA_FM_EXPTYPE m_type;
+  FX_DWORD m_line;
+};
+
+class CXFA_FMFunctionDefinition : public CXFA_FMExpression {
+ public:
+  CXFA_FMFunctionDefinition(FX_DWORD line,
+                            FX_BOOL isGlobal,
+                            const CFX_WideStringC& wsName,
+                            CFX_WideStringCArray* pArguments,
+                            CFX_PtrArray* pExpressions);
+  ~CXFA_FMFunctionDefinition() override;
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  CFX_WideStringC m_wsName;
+  CFX_WideStringCArray* m_pArguments;
+  CFX_PtrArray* m_pExpressions;
+  FX_BOOL m_isGlobal;
+};
+
+class CXFA_FMVarExpression : public CXFA_FMExpression {
+ public:
+  CXFA_FMVarExpression(FX_DWORD line,
+                       const CFX_WideStringC& wsName,
+                       CXFA_FMExpression* pInit);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  CFX_WideStringC m_wsName;
+  std::unique_ptr<CXFA_FMExpression> m_pInit;
+};
+
+class CXFA_FMExpExpression : public CXFA_FMExpression {
+ public:
+  CXFA_FMExpExpression(FX_DWORD line, CXFA_FMSimpleExpression* pExpression);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pExpression;
+};
+
+class CXFA_FMBlockExpression : public CXFA_FMExpression {
+ public:
+  CXFA_FMBlockExpression(FX_DWORD line, CFX_PtrArray* pExpressionList);
+  ~CXFA_FMBlockExpression() override;
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  CFX_PtrArray* m_pExpressionList;
+};
+
+class CXFA_FMDoExpression : public CXFA_FMExpression {
+ public:
+  CXFA_FMDoExpression(FX_DWORD line, CXFA_FMExpression* pList);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  std::unique_ptr<CXFA_FMExpression> m_pList;
+};
+
+class CXFA_FMIfExpression : public CXFA_FMExpression {
+ public:
+  CXFA_FMIfExpression(FX_DWORD line,
+                      CXFA_FMSimpleExpression* pExpression,
+                      CXFA_FMExpression* pIfExpression,
+                      CXFA_FMExpression* pElseExpression);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pExpression;
+  std::unique_ptr<CXFA_FMExpression> m_pIfExpression;
+  std::unique_ptr<CXFA_FMExpression> m_pElseExpression;
+};
+
+class CXFA_FMLoopExpression : public CXFA_FMExpression {
+ public:
+  explicit CXFA_FMLoopExpression(FX_DWORD line) : CXFA_FMExpression(line) {}
+  ~CXFA_FMLoopExpression() override;
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+};
+
+class CXFA_FMWhileExpression : public CXFA_FMLoopExpression {
+ public:
+  CXFA_FMWhileExpression(FX_DWORD line,
+                         CXFA_FMSimpleExpression* pCodition,
+                         CXFA_FMExpression* pExpression);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pCondition;
+  std::unique_ptr<CXFA_FMExpression> m_pExpression;
+};
+
+class CXFA_FMBreakExpression : public CXFA_FMExpression {
+ public:
+  explicit CXFA_FMBreakExpression(FX_DWORD line);
+  ~CXFA_FMBreakExpression() override;
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+};
+
+class CXFA_FMContinueExpression : public CXFA_FMExpression {
+ public:
+  explicit CXFA_FMContinueExpression(FX_DWORD line);
+  ~CXFA_FMContinueExpression() override;
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+};
+
+class CXFA_FMForExpression : public CXFA_FMLoopExpression {
+ public:
+  CXFA_FMForExpression(FX_DWORD line,
+                       const CFX_WideStringC& wsVariant,
+                       CXFA_FMSimpleExpression* pAssignment,
+                       CXFA_FMSimpleExpression* pAccessor,
+                       int32_t iDirection,
+                       CXFA_FMSimpleExpression* pStep,
+                       CXFA_FMExpression* pList);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  CFX_WideStringC m_wsVariant;
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pAssignment;
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pAccessor;
+  int32_t m_iDirection;
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pStep;
+  std::unique_ptr<CXFA_FMExpression> m_pList;
+};
+
+class CXFA_FMForeachExpression : public CXFA_FMLoopExpression {
+ public:
+  CXFA_FMForeachExpression(FX_DWORD line,
+                           const CFX_WideStringC& wsIdentifier,
+                           CFX_PtrArray* pAccessors,
+                           CXFA_FMExpression* pList);
+  ~CXFA_FMForeachExpression() override;
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf&) override;
+
+ private:
+  CFX_WideStringC m_wsIdentifier;
+  CFX_PtrArray* m_pAccessors;
+  std::unique_ptr<CXFA_FMExpression> m_pList;
+};
+
+#endif  // XFA_FXFA_FM2JS_XFA_EXPRESSION_H_