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diff --git a/fpdfsdk/src/javascript/JS_Runtime.h b/fpdfsdk/src/javascript/JS_Runtime.h
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+// 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 FPDFSDK_SRC_JAVASCRIPT_JS_RUNTIME_H_
+#define FPDFSDK_SRC_JAVASCRIPT_JS_RUNTIME_H_
+
+#include <set>
+#include <utility>
+
+#include "../../../third_party/base/nonstd_unique_ptr.h"
+#include "../../../core/include/fxcrt/fx_basic.h"
+#include "../../include/javascript/IJavaScript.h"
+#include "../../include/jsapi/fxjs_v8.h"
+#include "JS_EventHandler.h"
+
+class CJS_Context;
+
+class CJS_Runtime : public IFXJS_Runtime {
+ public:
+ class Observer {
+ public:
+ virtual void OnDestroyed() = 0;
+
+ protected:
+ virtual ~Observer() {}
+ };
+
+ using FieldEvent = std::pair<CFX_WideString, JS_EVENT_T>;
+
+ explicit CJS_Runtime(CPDFDoc_Environment* pApp);
+ ~CJS_Runtime() override;
+
+ // IFXJS_Runtime
+ IFXJS_Context* NewContext() override;
+ void ReleaseContext(IFXJS_Context* pContext) override;
+ IFXJS_Context* GetCurrentContext() override;
+ void SetReaderDocument(CPDFSDK_Document* pReaderDoc) override;
+ CPDFSDK_Document* GetReaderDocument() override { return m_pDocument; }
+
+ CPDFDoc_Environment* GetReaderApp() const { return m_pApp; }
+
+ // Returns true if the event isn't already found in the set.
+ bool AddEventToSet(const FieldEvent& event);
+ void RemoveEventFromSet(const FieldEvent& event);
+
+ void BeginBlock() { m_bBlocking = TRUE; }
+ void EndBlock() { m_bBlocking = FALSE; }
+ FX_BOOL IsBlocking() const { return m_bBlocking; }
+
+ v8::Isolate* GetIsolate() const { return m_isolate; }
+ v8::Local<v8::Context> NewJSContext();
+
+ virtual FX_BOOL GetHValueByName(const CFX_ByteStringC& utf8Name,
+ FXJSE_HVALUE hValue);
+ virtual FX_BOOL SetHValueByName(const CFX_ByteStringC& utf8Name,
+ FXJSE_HVALUE hValue);
+
+ void AddObserver(Observer* observer);
+ void RemoveObserver(Observer* observer);
+
+ private:
+ void DefineJSObjects();
+
+ CFX_ArrayTemplate<CJS_Context*> m_ContextArray;
+ CPDFDoc_Environment* m_pApp;
+ CPDFSDK_Document* m_pDocument;
+ FX_BOOL m_bBlocking;
+ std::set<FieldEvent> m_FieldEventSet;
+ v8::Isolate* m_isolate;
+ bool m_isolateManaged;
+ nonstd::unique_ptr<FXJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
+ v8::Global<v8::Context> m_context;
+ std::set<Observer*> m_observers;
+};
+
+#endif // FPDFSDK_SRC_JAVASCRIPT_JS_RUNTIME_H_