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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         EnumerationContext,
     54         QueryContext,
     55         IndexedGetterContext,
     56         IndexedSetterContext,
     57         IndexedDeletionContext,
     58         UnknownContext, // FIXME: Remove this once we've flipped over to the new API.
     59     };
     60 
     61     ExceptionState(Context context, const char* propertyName, const char* interfaceName, const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     62         : m_code(0)
     63         , m_context(context)
     64         , m_propertyName(propertyName)
     65         , m_interfaceName(interfaceName)
     66         , m_creationContext(creationContext)
     67         , m_isolate(isolate) { }
     68 
     69     ExceptionState(Context context, const char* interfaceName, const v8::Handle<v8::Object>& creationContext, v8::Isolate* isolate)
     70         : m_code(0)
     71         , m_context(context)
     72         , m_propertyName(0)
     73         , m_interfaceName(interfaceName)
     74         , m_creationContext(creationContext)
     75         , m_isolate(isolate) { ASSERT(m_context == ConstructionContext || m_context == EnumerationContext || m_context == IndexedSetterContext || m_context == IndexedGetterContext || m_context == IndexedDeletionContext); }
     76 
     77     virtual void throwDOMException(const ExceptionCode&, const String& message);
     78     virtual void throwTypeError(const String& message);
     79     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String());
     80 
     81     bool hadException() const { return !m_exception.isEmpty() || m_code; }
     82     void clearException();
     83 
     84     ExceptionCode code() const { return m_code; }
     85     const String& message() const { return m_message; }
     86 
     87     bool throwIfNeeded()
     88     {
     89         if (!hadException())
     90             return false;
     91         throwException();
     92         return true;
     93     }
     94 
     95     Context context() const { return m_context; }
     96     const char* propertyName() const { return m_propertyName; }
     97     const char* interfaceName() const { return m_interfaceName; }
     98 
     99     void rethrowV8Exception(v8::Handle<v8::Value> value)
    100     {
    101         setException(value);
    102     }
    103 
    104 protected:
    105     ExceptionCode m_code;
    106     Context m_context;
    107     String m_message;
    108     const char* m_propertyName;
    109     const char* m_interfaceName;
    110 
    111 private:
    112     void setException(v8::Handle<v8::Value>);
    113     void throwException();
    114 
    115     String addExceptionContext(const String&) const;
    116 
    117     ScopedPersistent<v8::Value> m_exception;
    118     v8::Handle<v8::Object> m_creationContext;
    119     v8::Isolate* m_isolate;
    120 };
    121 
    122 // Used if exceptions can/should not be directly thrown.
    123 class NonThrowableExceptionState FINAL : public ExceptionState {
    124 public:
    125     NonThrowableExceptionState(): ExceptionState(ExceptionState::UnknownContext, 0, 0, v8::Handle<v8::Object>(), v8::Isolate::GetCurrent()) { }
    126     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE;
    127     virtual void throwTypeError(const String& message = String()) OVERRIDE;
    128     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE;
    129 };
    130 
    131 // Used if any exceptions thrown are ignorable.
    132 class TrackExceptionState FINAL : public ExceptionState {
    133 public:
    134     TrackExceptionState(): ExceptionState(ExceptionState::UnknownContext, 0, 0, v8::Handle<v8::Object>(), v8::Isolate::GetCurrent()) { }
    135     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE;
    136     virtual void throwTypeError(const String& message = String()) OVERRIDE;
    137     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE;
    138 };
    139 
    140 } // namespace WebCore
    141 
    142 #endif // ExceptionState_h
    143