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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ExceptionState_h
     32 #define ExceptionState_h
     33 
     34 #include "bindings/v8/ScopedPersistent.h"
     35 #include "bindings/v8/V8ThrowException.h"
     36 #include "wtf/Noncopyable.h"
     37 #include "wtf/text/WTFString.h"
     38 #include <v8.h>
     39 
     40 namespace WebCore {
     41 
     42 typedef int ExceptionCode;
     43 
     44 class ExceptionState {
     45     WTF_MAKE_NONCOPYABLE(ExceptionState);
     46 public:
     47     explicit ExceptionState(v8::Isolate* isolate)
     48         : m_code(0)
     49         , m_isolate(isolate) { }
     50 
     51     virtual void throwDOMException(const ExceptionCode&,  const String& message = String());
     52     virtual void throwTypeError(const String& message = String());
     53 
     54     bool hadException() const { return !m_exception.isEmpty() || m_code; }
     55     void clearException();
     56 
     57     ExceptionCode code() { return m_code; }
     58 
     59     bool throwIfNeeded()
     60     {
     61         if (m_exception.isEmpty()) {
     62             if (!m_code)
     63                 return false;
     64             throwDOMException(m_code);
     65         }
     66 
     67         V8ThrowException::throwError(m_exception.newLocal(m_isolate));
     68         return true;
     69     }
     70 
     71 protected:
     72     ExceptionCode m_code;
     73 
     74 private:
     75     void setException(v8::Handle<v8::Value>);
     76 
     77     ScopedPersistent<v8::Value> m_exception;
     78     v8::Isolate* m_isolate;
     79 };
     80 
     81 class TrackExceptionState : public ExceptionState {
     82 public:
     83     TrackExceptionState(): ExceptionState(0) { }
     84     virtual void throwDOMException(const ExceptionCode&, const String& message = String()) OVERRIDE FINAL;
     85     virtual void throwTypeError(const String& message = String()) OVERRIDE FINAL;
     86 };
     87 
     88 } // namespace WebCore
     89 
     90 #endif // ExceptionState_h
     91