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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     enum Context {
     48         ConstructionContext,
     49         ExecutionContext,
     50         DeletionContext,
     51         GetterContext,
     52         SetterContext,
     53         UnknownContext, // FIXME: Remove this once we've flipped over to the new API.
     54     };
     55 
     56     explicit ExceptionState(const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     57         : m_code(0)
     58         , m_context(UnknownContext)
     59         , m_propertyName(0)
     60         , m_interfaceName(0)
     61         , m_creationContext(creationContext)
     62         , m_isolate(isolate) { }
     63 
     64     ExceptionState(Context context, const char* propertyName, const char* interfaceName, const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     65         : m_code(0)
     66         , m_context(context)
     67         , m_propertyName(propertyName)
     68         , m_interfaceName(interfaceName)
     69         , m_creationContext(creationContext)
     70         , m_isolate(isolate) { }
     71 
     72     ExceptionState(Context context, const char* interfaceName, const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     73         : m_code(0)
     74         , m_context(context)
     75         , m_propertyName(0)
     76         , m_interfaceName(interfaceName)
     77         , m_creationContext(creationContext)
     78         , m_isolate(isolate) { ASSERT(m_context == ConstructionContext); }
     79 
     80     virtual void throwDOMException(const ExceptionCode&, const String& message);
     81     virtual void throwTypeError(const String& message);
     82     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String());
     83 
     84     // Please don't use these methods. Use ::throwDOMException and ::throwTypeError, and pass in a useful exception message.
     85     virtual void throwUninformativeAndGenericDOMException(const ExceptionCode& ec) { throwDOMException(ec, String()); }
     86     virtual void throwUninformativeAndGenericTypeError() { throwTypeError(String()); }
     87 
     88     bool hadException() const { return !m_exception.isEmpty() || m_code; }
     89     void clearException();
     90 
     91     ExceptionCode code() const { return m_code; }
     92 
     93     bool throwIfNeeded()
     94     {
     95         if (m_exception.isEmpty()) {
     96             if (!m_code)
     97                 return false;
     98             throwUninformativeAndGenericDOMException(m_code);
     99         }
    100 
    101         V8ThrowException::throwError(m_exception.newLocal(m_isolate), m_isolate);
    102         return true;
    103     }
    104 
    105     Context context() const { return m_context; }
    106     const char* propertyName() const { return m_propertyName; }
    107     const char* interfaceName() const { return m_interfaceName; }
    108 
    109 protected:
    110     ExceptionCode m_code;
    111     Context m_context;
    112     const char* m_propertyName;
    113     const char* m_interfaceName;
    114 
    115 private:
    116     void setException(v8::Handle<v8::Value>);
    117 
    118     String addExceptionContext(const String&) const;
    119 
    120     ScopedPersistent<v8::Value> m_exception;
    121     v8::Handle<v8::Object> m_creationContext;
    122     v8::Isolate* m_isolate;
    123 };
    124 
    125 class TrackExceptionState : public ExceptionState {
    126 public:
    127     TrackExceptionState(): ExceptionState(v8::Handle<v8::Object>(), 0) { }
    128     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE FINAL;
    129     virtual void throwTypeError(const String& message = String()) OVERRIDE FINAL;
    130     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE FINAL;
    131 };
    132 
    133 } // namespace WebCore
    134 
    135 #endif // ExceptionState_h
    136