dom/bindings/ToJSValue.cpp
author Sylvestre Ledru <sledru@mozilla.com>
Thu, 17 Aug 2017 11:13:01 +0200
changeset 648192 c236dfe7dc98c387219d7cb45d0693560db708fd
parent 561186 5505b53a0acb3dcf2c6a565169d99c23e1c8da52
permissions -rw-r--r--
indent all (with js specific coding style) MozReview-Commit-ID: LU1md2wyB8

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/Promise.h"
#include "nsAString.h"
#include "nsContentUtils.h"
#include "nsStringBuffer.h"
#include "xpcpublic.h"

namespace mozilla {
namespace dom {

bool
ToJSValue(JSContext* aCx,
          const nsAString& aArgument,
          JS::MutableHandle<JS::Value> aValue)
{
  // Make sure we're called in a compartment
  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));

  // XXXkhuey I'd love to use xpc::NonVoidStringToJsval here, but it requires
  // a non-const nsAString for silly reasons.
  nsStringBuffer* sharedBuffer;
  if (!XPCStringConvert::ReadableToJSVal(
        aCx, aArgument, &sharedBuffer, aValue)) {
    return false;
  }

  if (sharedBuffer) {
    NS_ADDREF(sharedBuffer);
  }

  return true;
}

bool
ToJSValue(JSContext* aCx,
          nsresult aArgument,
          JS::MutableHandle<JS::Value> aValue)
{
  RefPtr<Exception> exception = CreateException(aArgument);
  return ToJSValue(aCx, exception, aValue);
}

bool
ToJSValue(JSContext* aCx,
          ErrorResult& aArgument,
          JS::MutableHandle<JS::Value> aValue)
{
  MOZ_ASSERT(aArgument.Failed());
  MOZ_ASSERT(
    !aArgument.IsUncatchableException(),
    "Doesn't make sense to convert uncatchable exception to a JS value!");
  MOZ_ALWAYS_TRUE(aArgument.MaybeSetPendingException(aCx));
  MOZ_ALWAYS_TRUE(JS_GetPendingException(aCx, aValue));
  JS_ClearPendingException(aCx);
  return true;
}

bool
ToJSValue(JSContext* aCx,
          Promise& aArgument,
          JS::MutableHandle<JS::Value> aValue)
{
  aValue.setObject(*aArgument.PromiseObj());
  return MaybeWrapObjectValue(aCx, aValue);
}

} // namespace dom
} // namespace mozilla