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//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Javascript exception abstraction

#ifndef ExceptionContext_h
#define ExceptionContext_h

#include <wtf/Noncopyable.h>
#include "ScriptController.h"

#if USE(JSC)
namespace JSC {
class ExecState;
}
#endif


namespace WebCore {

class Node;
#if USE(V8)
class ExceptionCatcher;
#endif

// Provides context of an exception. This class is an abstraction of JSC's
// ExecState. In V8, its purpose is to carry along the exceptions captured
// by the ExceptionCatcher.
class ExceptionContext : Noncopyable {
public:
    ExceptionContext(Node*);
#if USE(V8)
    ExceptionContext();
#elif USE(JSC)
    ExceptionContext(JSC::ExecState* exec) : m_exec(exec) {}
    JSC::ExecState* exec() const { return m_exec; }
#endif
    ~ExceptionContext() {}

    bool hadException();
    JSException exception() const;

    // Returns a non-exception code object.
    static JSException noException();

private:
#if USE(V8)
    friend class ExceptionCatcher;
    void setException(JSException exception) { m_exception = exception; }
    void setExceptionCatcher(ExceptionCatcher*);
    JSException m_exception;
    ExceptionCatcher* m_exceptionCatcher;
#elif USE(JSC)
    JSC::ExecState* m_exec;
#endif
};

#if USE(V8)
// A wrapper around v8::TryCatch helper in order to facilitate updating
// ExceptionContext with the latest exceptions that may have occurred.
class ExceptionCatcher {
public:
    ExceptionCatcher(ExceptionContext*);
    ~ExceptionCatcher();
    void updateContext();
    void detachContext();

private:
    ExceptionContext* m_context;
    v8::TryCatch m_catcher;
};
#endif

}  // namespace WebCore

#endif  // !defined(ExceptionContext_h)