third_party/WebKit/Source/core/events/ErrorEvent.cpp

/*
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#include "core/events/ErrorEvent.h"

#include <memory>

#include "bindings/core/v8/V8BindingForCore.h"
#include "v8/include/v8.h"

namespace blink {

ErrorEvent::ErrorEvent()
    : sanitized_message_(),
      location_(SourceLocation::Create(String(), 0, 0, nullptr)),
      world_(&DOMWrapperWorld::Current(v8::Isolate::GetCurrent())) {}

ErrorEvent::ErrorEvent(ScriptState* script_state,
                       const AtomicString& type,
                       const ErrorEventInit& initializer)
    : Event(type, initializer),
      sanitized_message_(),
      world_(&script_state->World()) {
  if (initializer.hasMessage())
    sanitized_message_ = initializer.message();
  location_ = SourceLocation::Create(
      initializer.hasFilename() ? initializer.filename() : String(),
      initializer.hasLineno() ? initializer.lineno() : 0,
      initializer.hasColno() ? initializer.colno() : 0, nullptr);
  if (initializer.hasError()) {
    error_.Set(initializer.error().GetIsolate(), initializer.error().V8Value());
  }
}

ErrorEvent::ErrorEvent(const String& message,
                       std::unique_ptr<SourceLocation> location,
                       ScriptValue error,
                       DOMWrapperWorld* world)
    : Event(EventTypeNames::error, false, true),
      sanitized_message_(message),
      location_(std::move(location)),
      world_(world) {
  if (!error.IsEmpty())
    error_.Set(error.GetIsolate(), error.V8Value());
}

void ErrorEvent::SetUnsanitizedMessage(const String& message) {
  DCHECK(unsanitized_message_.IsEmpty());
  unsanitized_message_ = message;
}

ErrorEvent::~ErrorEvent() = default;

const AtomicString& ErrorEvent::InterfaceName() const {
  return EventNames::ErrorEvent;
}

ScriptValue ErrorEvent::error(ScriptState* script_state) const {
  // Don't return |m_error| when we are in the different worlds to avoid
  // leaking a V8 value.
  // We do not clone Error objects (exceptions), for 2 reasons:
  // 1) Errors carry a reference to the isolated world's global object, and
  //    thus passing it around would cause leakage.
  // 2) Errors cannot be cloned (or serialized):
  if (World() != &script_state->World() || error_.IsEmpty())
    return ScriptValue();
  return ScriptValue(script_state, error_.NewLocal(script_state->GetIsolate()));
}

void ErrorEvent::Trace(blink::Visitor* visitor) {
  Event::Trace(visitor);
}

void ErrorEvent::TraceWrappers(const ScriptWrappableVisitor* visitor) const {
  visitor->TraceWrappers(error_);
  Event::TraceWrappers(visitor);
}

}  // namespace blink