Source/bindings/v8/ExceptionState.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#ifndef ExceptionState_h
#define ExceptionState_h

#include "bindings/v8/ScopedPersistent.h"
#include "bindings/v8/V8ThrowException.h"
#include "wtf/Noncopyable.h"
#include "wtf/text/WTFString.h"
#include <v8.h>

namespace WebCore {

typedef int ExceptionCode;

class ExceptionState {
    WTF_MAKE_NONCOPYABLE(ExceptionState);
public:
    explicit ExceptionState(const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
        : m_code(0)
        , m_creationContext(creationContext)
        , m_isolate(isolate) { }

    virtual void throwDOMException(const ExceptionCode&, const String& message);
    virtual void throwTypeError(const String& message);
    virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String());

    // Please don't use these methods. Use ::throwDOMException and ::throwTypeError, and pass in a useful exception message.
    virtual void throwUninformativeAndGenericDOMException(const ExceptionCode& ec) { throwDOMException(ec, String()); }
    virtual void throwUninformativeAndGenericTypeError() { throwTypeError(String()); }

    bool hadException() const { return !m_exception.isEmpty() || m_code; }
    void clearException();

    ExceptionCode code() { return m_code; }

    bool throwIfNeeded()
    {
        if (m_exception.isEmpty()) {
            if (!m_code)
                return false;
            throwUninformativeAndGenericDOMException(m_code);
        }

        V8ThrowException::throwError(m_exception.newLocal(m_isolate), m_isolate);
        return true;
    }

protected:
    ExceptionCode m_code;

private:
    void setException(v8::Handle<v8::Value>);

    ScopedPersistent<v8::Value> m_exception;
    v8::Handle<v8::Object> m_creationContext;
    v8::Isolate* m_isolate;
};

class TrackExceptionState : public ExceptionState {
public:
    TrackExceptionState(): ExceptionState(v8::Handle<v8::Object>(), 0) { }
    virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE FINAL;
    virtual void throwTypeError(const String& message = String()) OVERRIDE FINAL;
    virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE FINAL;
};

} // namespace WebCore

#endif // ExceptionState_h