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91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* vim: set ts=2 sw=2 et tw=79: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* A struct for tracking exceptions that need to be thrown to JS.
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*/
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#ifndef mozilla_ErrorResult_h
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#define mozilla_ErrorResult_h
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#include <stdarg.h>
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#include "jsapi.h"
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#include "nscore.h"
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#include "mozilla/Assertions.h"
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namespace mozilla {
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namespace dom {
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enum ErrNum {
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#define MSG_DEF(_name, _argc, _str) \
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_name,
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#include "mozilla/dom/Errors.msg"
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#undef MSG_DEF
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Err_Limit
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};
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} // namespace dom
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class ErrorResult {
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public:
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ErrorResult() {
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mResult = NS_OK;
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}
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#ifdef DEBUG
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~ErrorResult() {
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MOZ_ASSERT_IF(IsTypeError(), !mMessage);
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}
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#endif
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void Throw(nsresult rv) {
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MOZ_ASSERT(NS_FAILED(rv), "Please don't try throwing success");
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MOZ_ASSERT(rv != NS_ERROR_TYPE_ERR, "Use ThrowTypeError()");
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MOZ_ASSERT(!IsTypeError(), "Don't overwite TypeError");
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mResult = rv;
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}
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void ThrowTypeError(const dom::ErrNum errorNumber, ...);
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void ReportTypeError(JSContext* cx);
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bool IsTypeError() const { return ErrorCode() == NS_ERROR_TYPE_ERR; }
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// In the future, we can add overloads of Throw that take more
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// interesting things, like strings or DOM exception types or
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// something if desired.
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// Backwards-compat to make conversion simpler. We don't call
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// Throw() here because people can easily pass success codes to
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// this.
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void operator=(nsresult rv) {
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MOZ_ASSERT(rv != NS_ERROR_TYPE_ERR, "Use ThrowTypeError()");
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MOZ_ASSERT(!IsTypeError(), "Don't overwite TypeError");
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mResult = rv;
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}
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bool Failed() const {
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return NS_FAILED(mResult);
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}
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nsresult ErrorCode() const {
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return mResult;
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}
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private:
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nsresult mResult;
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struct Message;
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// Do not use nsAutoPtr to avoid extra initalizatoin and check.
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Message* mMessage;
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// Not to be implemented, to make sure people always pass this by
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// reference, not by value.
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ErrorResult(const ErrorResult&) MOZ_DELETE;
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};
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} // namespace mozilla
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#endif /* mozilla_ErrorResult_h */
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