/* -*- 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 "nsDOMSerializer.h"

#include "mozilla/Encoding.h"

#include "nsIDocument.h"

#include "nsIDocumentEncoder.h"

#include "nsComponentManagerUtils.h"

#include "nsContentCID.h"

#include "nsContentUtils.h"

#include "nsError.h"

#include "nsINode.h"

using namespace mozilla;

nsDOMSerializer::nsDOMSerializer()

{

}

static already_AddRefed<nsIDocumentEncoder>

SetUpEncoder(nsINode& aRoot, const nsAString& aCharset, ErrorResult& aRv)

{

  nsresult rv;

  nsCOMPtr<nsIDocumentEncoder> encoder =

    do_CreateInstance(NS_DOC_ENCODER_CONTRACTID_BASE "application/xhtml+xml", &rv);

  if (NS_FAILED(rv)) {

    aRv.Throw(rv);

    return nullptr;

  }

  nsIDocument* doc = aRoot.OwnerDoc();

  bool entireDocument = (doc == &aRoot);

  // This method will fail if no document

  rv = encoder->

    NativeInit(doc, NS_LITERAL_STRING("application/xhtml+xml"),

               nsIDocumentEncoder::OutputRaw |

               nsIDocumentEncoder::OutputDontRewriteEncodingDeclaration);

  if (NS_FAILED(rv)) {

    aRv.Throw(rv);

    return nullptr;

  }

  NS_ConvertUTF16toUTF8 charset(aCharset);

  if (charset.IsEmpty()) {

    doc->GetDocumentCharacterSet()->Name(charset);

  }

  rv = encoder->SetCharset(charset);

  if (NS_FAILED(rv)) {

    aRv.Throw(rv);

    return nullptr;

  }

  // If we are working on the entire document we do not need to

  // specify which part to serialize

  if (!entireDocument) {

    rv = encoder->SetNode(&aRoot);

  }

  if (NS_FAILED(rv)) {

    aRv.Throw(rv);

    return nullptr;

  }

  return encoder.forget();

}

void

nsDOMSerializer::SerializeToString(nsINode& aRoot, nsAString& aStr,

                                   ErrorResult& aRv)

{

  aStr.Truncate();

  if (!nsContentUtils::CanCallerAccess(&aRoot)) {

    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);

    return;

  }

  nsCOMPtr<nsIDocumentEncoder> encoder =

    SetUpEncoder(aRoot, EmptyString(), aRv);

  if (aRv.Failed()) {

    return;

  }

  nsresult rv = encoder->EncodeToString(aStr);

  if (NS_FAILED(rv)) {

    aRv.Throw(rv);

  }

}

void

nsDOMSerializer::SerializeToStream(nsINode& aRoot, nsIOutputStream* aStream,

                                   const nsAString& aCharset,

                                   ErrorResult& aRv)

{

  if (NS_WARN_IF(!aStream)) {

    aRv.Throw(NS_ERROR_INVALID_ARG);

    return;

  }

  // The charset arg can be empty, in which case we get the document's

  // charset and use that when serializing.

  // No point doing a CanCallerAccess check, because we can only be

  // called by system JS or C++.

  nsCOMPtr<nsIDocumentEncoder> encoder =

    SetUpEncoder(aRoot, aCharset, aRv);

  if (aRv.Failed()) {

    return;

  }

  nsresult rv = encoder->EncodeToStream(aStream);

  if (NS_FAILED(rv)) {

    aRv.Throw(rv);

  }

}