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diff --git a/xfa/fxfa/fm2js/cxfa_fmparser.h b/xfa/fxfa/fm2js/cxfa_fmparser.h
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+++ b/xfa/fxfa/fm2js/cxfa_fmparser.h
@@ -0,0 +1,59 @@
+// 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_CXFA_FMPARSER_H_
+#define XFA_FXFA_FM2JS_CXFA_FMPARSER_H_
+
+#include <memory>
+#include <vector>
+
+#include "xfa/fxfa/fm2js/cxfa_fmexpression.h"
+#include "xfa/fxfa/fm2js/cxfa_fmlexer.h"
+
+class CXFA_FMParser {
+ public:
+  explicit CXFA_FMParser(const CFX_WideStringC& wsFormcalc);
+  ~CXFA_FMParser();
+
+  std::unique_ptr<CXFA_FMFunctionDefinition> Parse();
+  bool HasError() const;
+
+ private:
+  bool NextToken();
+  bool CheckThenNext(XFA_FM_TOKEN op);
+
+  std::vector<std::unique_ptr<CXFA_FMExpression>> ParseTopExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseFunction();
+  std::unique_ptr<CXFA_FMExpression> ParseExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseVarExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseExpExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseBlockExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseIfExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseWhileExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseForExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseForeachExpression();
+  std::unique_ptr<CXFA_FMExpression> ParseDoExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseParenExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseSimpleExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseSubassignmentInForExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseLogicalOrExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseLogicalAndExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseEqualityExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseRelationalExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseAddtiveExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseMultiplicativeExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseUnaryExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParsePrimaryExpression();
+  std::unique_ptr<CXFA_FMSimpleExpression> ParsePostExpression(
+      std::unique_ptr<CXFA_FMSimpleExpression> e);
+  std::unique_ptr<CXFA_FMSimpleExpression> ParseIndexExpression();
+
+  std::unique_ptr<CXFA_FMLexer> m_lexer;
+  std::unique_ptr<CXFA_FMToken> m_token;
+  bool m_error;
+};
+
+#endif  // XFA_FXFA_FM2JS_CXFA_FMPARSER_H_