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diff --git a/xfa/src/fxfa/fm2js/xfa_simpleexpression.h b/xfa/src/fxfa/fm2js/xfa_simpleexpression.h
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+++ b/xfa/src/fxfa/fm2js/xfa_simpleexpression.h
@@ -0,0 +1,292 @@
+// 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_SRC_FXFA_FM2JS_XFA_SIMPLEEXPRESSION_H_
+#define XFA_SRC_FXFA_FM2JS_XFA_SIMPLEEXPRESSION_H_
+
+#include <memory>
+
+#include "core/include/fxcrt/fx_basic.h"
+#include "xfa/src/fxfa/fm2js/xfa_lexer.h"
+
+#define RUNTIMEFUNCTIONRETURNVALUE \
+  (FX_WSTRC(L"foxit_xfa_formcalc_runtime_func_return_value"))
+#define EXCLAMATION_IN_IDENTIFIER \
+  (FX_WSTRC(L"foxit_xfa_formcalc__exclamation__"))
+
+enum XFA_FM_SimpleExpressionType {
+  ASSIGN,
+  LOGICALOR,
+  LOGICALAND,
+  EQUALITY,
+  NOTEQUALITY,
+  LESS,
+  LESSEQUAL,
+  GREATER,
+  GREATEREQUAL,
+  PLUS,
+  MINUS,
+  MULTIPLE,
+  DIVIDE,
+  POSITIVE,
+  NEGATIVE,
+  NOT,
+  CALL,
+  DOT,
+  DOTDOT,
+  CONCATFMOBJECT,
+  ISFMOBJECT,
+  ISFMARRAY,
+  GETFMVALUE,
+  GETFMJSOBJ,
+  VARFILTER
+};
+
+CFX_WideStringC XFA_FM_EXPTypeToString(
+    XFA_FM_SimpleExpressionType simpleExpType);
+
+enum XFA_FM_AccessorIndex {
+  ACCESSOR_NO_INDEX,
+  ACCESSOR_NO_RELATIVEINDEX,
+  ACCESSOR_POSITIVE_INDEX,
+  ACCESSOR_NEGATIVE_INDEX
+};
+
+class CXFA_FMSimpleExpression {
+ public:
+  CXFA_FMSimpleExpression(FX_DWORD line, XFA_FM_TOKEN op);
+  virtual ~CXFA_FMSimpleExpression() {}
+  virtual void ToJavaScript(CFX_WideTextBuf& javascript);
+  virtual void ToImpliedReturnJS(CFX_WideTextBuf& javascript);
+
+  XFA_FM_TOKEN GetOperatorToken() const;
+
+ protected:
+  FX_DWORD m_line;
+  XFA_FM_TOKEN m_op;
+};
+
+class CXFA_FMNullExpression : public CXFA_FMSimpleExpression {
+ public:
+  explicit CXFA_FMNullExpression(FX_DWORD line);
+  ~CXFA_FMNullExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMNumberExpression : public CXFA_FMSimpleExpression {
+ public:
+  CXFA_FMNumberExpression(FX_DWORD line, CFX_WideStringC wsNumber);
+  ~CXFA_FMNumberExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  CFX_WideStringC m_wsNumber;
+};
+
+class CXFA_FMStringExpression : public CXFA_FMSimpleExpression {
+ public:
+  CXFA_FMStringExpression(FX_DWORD line, CFX_WideStringC wsString);
+  ~CXFA_FMStringExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  CFX_WideStringC m_wsString;
+};
+
+class CXFA_FMIdentifierExpressionn : public CXFA_FMSimpleExpression {
+ public:
+  CXFA_FMIdentifierExpressionn(FX_DWORD line, CFX_WideStringC wsIdentifier);
+  ~CXFA_FMIdentifierExpressionn() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  CFX_WideStringC m_wsIdentifier;
+};
+
+class CXFA_FMUnaryExpression : public CXFA_FMSimpleExpression {
+ public:
+  CXFA_FMUnaryExpression(FX_DWORD line,
+                         XFA_FM_TOKEN op,
+                         CXFA_FMSimpleExpression* pExp);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ protected:
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pExp;
+};
+
+class CXFA_FMBinExpression : public CXFA_FMSimpleExpression {
+ public:
+  CXFA_FMBinExpression(FX_DWORD line,
+                       XFA_FM_TOKEN op,
+                       CXFA_FMSimpleExpression* pExp1,
+                       CXFA_FMSimpleExpression* pExp2);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ protected:
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pExp1;
+  std::unique_ptr<CXFA_FMSimpleExpression> m_pExp2;
+};
+
+class CXFA_FMAssignExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMAssignExpression(FX_DWORD line,
+                          XFA_FM_TOKEN op,
+                          CXFA_FMSimpleExpression* pExp1,
+                          CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMAssignExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+  void ToImpliedReturnJS(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMLogicalOrExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMLogicalOrExpression(FX_DWORD line,
+                             XFA_FM_TOKEN op,
+                             CXFA_FMSimpleExpression* pExp1,
+                             CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMLogicalOrExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMLogicalAndExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMLogicalAndExpression(FX_DWORD line,
+                              XFA_FM_TOKEN op,
+                              CXFA_FMSimpleExpression* pExp1,
+                              CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMLogicalAndExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMEqualityExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMEqualityExpression(FX_DWORD line,
+                            XFA_FM_TOKEN op,
+                            CXFA_FMSimpleExpression* pExp1,
+                            CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMEqualityExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMRelationalExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMRelationalExpression(FX_DWORD line,
+                              XFA_FM_TOKEN op,
+                              CXFA_FMSimpleExpression* pExp1,
+                              CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMRelationalExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMAdditiveExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMAdditiveExpression(FX_DWORD line,
+                            XFA_FM_TOKEN op,
+                            CXFA_FMSimpleExpression* pExp1,
+                            CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMAdditiveExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMMultiplicativeExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMMultiplicativeExpression(FX_DWORD line,
+                                  XFA_FM_TOKEN op,
+                                  CXFA_FMSimpleExpression* pExp1,
+                                  CXFA_FMSimpleExpression* pExp2);
+  ~CXFA_FMMultiplicativeExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMPosExpression : public CXFA_FMUnaryExpression {
+ public:
+  CXFA_FMPosExpression(FX_DWORD line, CXFA_FMSimpleExpression* pExp);
+  ~CXFA_FMPosExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMNegExpression : public CXFA_FMUnaryExpression {
+ public:
+  CXFA_FMNegExpression(FX_DWORD line, CXFA_FMSimpleExpression* pExp);
+  ~CXFA_FMNegExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMNotExpression : public CXFA_FMUnaryExpression {
+ public:
+  CXFA_FMNotExpression(FX_DWORD line, CXFA_FMSimpleExpression* pExp);
+  ~CXFA_FMNotExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+class CXFA_FMCallExpression : public CXFA_FMUnaryExpression {
+ public:
+  CXFA_FMCallExpression(FX_DWORD line,
+                        CXFA_FMSimpleExpression* pExp,
+                        CFX_PtrArray* pArguments,
+                        FX_BOOL bIsSomMethod);
+  ~CXFA_FMCallExpression() override;
+  bool IsBuildInFunc(CFX_WideTextBuf* funcName);
+  FX_DWORD IsMethodWithObjParam(const CFX_WideStringC& methodName);
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  FX_BOOL m_bIsSomMethod;
+  CFX_PtrArray* m_pArguments;
+};
+
+class CXFA_FMDotAccessorExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMDotAccessorExpression(FX_DWORD line,
+                               CXFA_FMSimpleExpression* pAccessor,
+                               XFA_FM_TOKEN op,
+                               CFX_WideStringC wsIdentifier,
+                               CXFA_FMSimpleExpression* pIndexExp);
+  ~CXFA_FMDotAccessorExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  CFX_WideStringC m_wsIdentifier;
+};
+
+class CXFA_FMIndexExpression : public CXFA_FMUnaryExpression {
+ public:
+  CXFA_FMIndexExpression(FX_DWORD line,
+                         XFA_FM_AccessorIndex accessorIndex,
+                         CXFA_FMSimpleExpression* pIndexExp,
+                         FX_BOOL bIsStarIndex);
+  ~CXFA_FMIndexExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  XFA_FM_AccessorIndex m_accessorIndex;
+  FX_BOOL m_bIsStarIndex;
+};
+
+class CXFA_FMDotDotAccessorExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMDotDotAccessorExpression(FX_DWORD line,
+                                  CXFA_FMSimpleExpression* pAccessor,
+                                  XFA_FM_TOKEN op,
+                                  CFX_WideStringC wsIdentifier,
+                                  CXFA_FMSimpleExpression* pIndexExp);
+  ~CXFA_FMDotDotAccessorExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+
+ private:
+  CFX_WideStringC m_wsIdentifier;
+};
+
+class CXFA_FMMethodCallExpression : public CXFA_FMBinExpression {
+ public:
+  CXFA_FMMethodCallExpression(FX_DWORD line,
+                              CXFA_FMSimpleExpression* pAccessorExp1,
+                              CXFA_FMSimpleExpression* pCallExp);
+  ~CXFA_FMMethodCallExpression() override {}
+  void ToJavaScript(CFX_WideTextBuf& javascript) override;
+};
+
+#endif  // XFA_SRC_FXFA_FM2JS_XFA_SIMPLEEXPRESSION_H_