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nsHTMLContentSerializer.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=80: */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Ryan Jones <sciguyryan@gmail.com>
 *   Laurent Jouanneau <laurent.jouanneau@disruptive-innovations.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * nsIContentSerializer implementation that can be used with an
 * nsIDocumentEncoder to convert an HTML (not XHTML!) DOM to an HTML
 * string that could be parsed into more or less the original DOM.
 */

#include "nsHTMLContentSerializer.h"

#include "nsIDOMElement.h"
#include "nsIDOMText.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsINameSpaceManager.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsXPIDLString.h"
#include "nsIServiceManager.h"
#include "nsIDocumentEncoder.h"
#include "nsGkAtoms.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "nsEscape.h"
#include "nsITextToSubURI.h"
#include "nsCRT.h"
#include "nsIParserService.h"
#include "nsContentUtils.h"
#include "nsLWBrkCIID.h"
#include "nsIScriptElement.h"
#include "nsAttrName.h"
#include "nsHtml5Module.h"
#include "nsIHTMLDocument.h"

static const char kMozStr[] = "moz";

static const PRInt32 kLongLineLen = 128;

nsresult NS_NewHTMLContentSerializer(nsIContentSerializer** aSerializer)
{
  nsHTMLContentSerializer* it = new nsHTMLContentSerializer();
  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return CallQueryInterface(it, aSerializer);
}

nsHTMLContentSerializer::nsHTMLContentSerializer()
{
    mIsHTMLSerializer = PR_TRUE;
}

nsHTMLContentSerializer::~nsHTMLContentSerializer()
{
}


NS_IMETHODIMP
nsHTMLContentSerializer::AppendDocumentStart(nsIDOMDocument *aDocument,
                                             nsAString& aStr)
{
  return NS_OK;
}

void 
nsHTMLContentSerializer::SerializeAttributes(nsIContent* aContent,
                                             nsIDOMElement *aOriginalElement,
                                             nsAString& aTagPrefix,
                                             const nsAString& aTagNamespaceURI,
                                             nsIAtom* aTagName,
                                             nsAString& aStr)
{
  PRInt32 count = aContent->GetAttrCount();
  if (!count)
    return;

  nsresult rv;
  nsAutoString nameStr, valueStr;
  NS_NAMED_LITERAL_STRING(_mozStr, "_moz");

  // HTML5 parser stored them in the order they were parsed so we want to
  // loop forward in that case.
  nsIDocument* doc = aContent->GetOwnerDocument();
  PRBool caseSensitive = doc && doc->IsCaseSensitive();
  PRBool loopForward = PR_FALSE;
  if (!caseSensitive) {
    nsCOMPtr<nsIHTMLDocument> htmlDoc(do_QueryInterface(doc));
    if (htmlDoc) {
      loopForward = nsHtml5Module::sEnabled;
    }
  }
  PRInt32 index, limit, step;
  if (loopForward) {
    index = 0;
    limit = count;
    step = 1;
  }
  else {
    // Loop backward over the attributes, since the order they are stored in is
    // the opposite of the order they were parsed in (see bug 213347 for reason).
    index = count - 1;
    limit = -1;
    step = -1;
  }
  
  for (; index != limit; index += step) {
    const nsAttrName* name = aContent->GetAttrNameAt(index);
    PRInt32 namespaceID = name->NamespaceID();
    nsIAtom* attrName = name->LocalName();

    // Filter out any attribute starting with [-|_]moz
    const char* sharedName;
    attrName->GetUTF8String(&sharedName);
    if ((('_' == *sharedName) || ('-' == *sharedName)) &&
        !nsCRT::strncmp(sharedName+1, kMozStr, PRUint32(sizeof(kMozStr)-1))) {
      continue;
    }
    aContent->GetAttr(namespaceID, attrName, valueStr);

    // 
    // Filter out special case of <br type="_moz"> or <br _moz*>,
    // used by the editor.  Bug 16988.  Yuck.
    //
    if (aTagName == nsGkAtoms::br && attrName == nsGkAtoms::type &&
        StringBeginsWith(valueStr, _mozStr)) {
      continue;
    }

    if (mIsCopying && mIsFirstChildOfOL && (aTagName == nsGkAtoms::li) && 
        (attrName == nsGkAtoms::value)){
      // This is handled separately in SerializeLIValueAttribute()
      continue;
    }
    PRBool isJS = IsJavaScript(aContent, attrName, namespaceID, valueStr);
    
    if (((attrName == nsGkAtoms::href) || 
         (attrName == nsGkAtoms::src))) {
      // Make all links absolute when converting only the selection:
      if (mFlags & nsIDocumentEncoder::OutputAbsoluteLinks) {
        // Would be nice to handle OBJECT and APPLET tags,
        // but that gets more complicated since we have to
        // search the tag list for CODEBASE as well.
        // For now, just leave them relative.
        nsCOMPtr<nsIURI> uri = aContent->GetBaseURI();
        if (uri) {
          nsAutoString absURI;
          rv = NS_MakeAbsoluteURI(absURI, valueStr, uri);
          if (NS_SUCCEEDED(rv)) {
            valueStr = absURI;
          }
        }
      }
      // Need to escape URI.
      nsAutoString tempURI(valueStr);
      if (!isJS && NS_FAILED(EscapeURI(aContent, tempURI, valueStr)))
        valueStr = tempURI;
    }

    if (mRewriteEncodingDeclaration && aTagName == nsGkAtoms::meta &&
        attrName == nsGkAtoms::content) {
      // If we're serializing a <meta http-equiv="content-type">,
      // use the proper value, rather than what's in the document.
      nsAutoString header;
      aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::httpEquiv, header);
      if (header.LowerCaseEqualsLiteral("content-type")) {
        valueStr = NS_LITERAL_STRING("text/html; charset=") +
          NS_ConvertASCIItoUTF16(mCharset);
      }
    }

    attrName->ToString(nameStr);

    // Expand shorthand attribute.
    if (IsShorthandAttr(attrName, aTagName) && valueStr.IsEmpty()) {
      valueStr = nameStr;
    }
    SerializeAttr(EmptyString(), nameStr, valueStr, aStr, !isJS);
  }
}

NS_IMETHODIMP
nsHTMLContentSerializer::AppendElementStart(nsIDOMElement *aElement,
                                            nsIDOMElement *aOriginalElement,
                                            nsAString& aStr)
{
  NS_ENSURE_ARG(aElement);

  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  if (!content) return NS_ERROR_FAILURE;

  PRBool forceFormat = PR_FALSE;
  if (!CheckElementStart(content, forceFormat, aStr)) {
    return NS_OK;
  }

  nsIAtom *name = content->Tag();
  PRBool lineBreakBeforeOpen = LineBreakBeforeOpen(content->GetNameSpaceID(), name);

  if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {
    if (mColPos && lineBreakBeforeOpen) {
      AppendNewLineToString(aStr);
    }
    else {
      MaybeAddNewlineForRootNode(aStr);
    }
    if (!mColPos) {
      AppendIndentation(aStr);
    }
    else if (mAddSpace) {
      AppendToString(PRUnichar(' '), aStr);
      mAddSpace = PR_FALSE;
    }
  }
  else if (mAddSpace) {
    AppendToString(PRUnichar(' '), aStr);
    mAddSpace = PR_FALSE;
  }
  else {
    MaybeAddNewlineForRootNode(aStr);
  }
  // Always reset to avoid false newlines in case MaybeAddNewlineForRootNode wasn't
  // called
  mAddNewlineForRootNode = PR_FALSE;
  
  AppendToString(kLessThan, aStr);

  nsAutoString nameStr;
  name->ToString(nameStr);
  AppendToString(nameStr.get(), -1, aStr);

  MaybeEnterInPreContent(content);

  // for block elements, we increase the indentation
  if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw)
    IncrIndentation(name);

  // Need to keep track of OL and LI elements in order to get ordinal number 
  // for the LI.
  if (mIsCopying && name == nsGkAtoms::ol){
    // We are copying and current node is an OL;
    // Store its start attribute value in olState->startVal.
    nsAutoString start;
    PRInt32 startAttrVal = 0;
    aElement->GetAttribute(NS_LITERAL_STRING("start"), start);
    if (!start.IsEmpty()){
      PRInt32 rv = 0;
      startAttrVal = start.ToInteger(&rv);
      //If OL has "start" attribute, first LI element has to start with that value
      //Therefore subtracting 1 as all the LI elements are incrementing it before using it;
      //In failure of ToInteger(), default StartAttrValue to 0.
      if (NS_SUCCEEDED(rv))
        startAttrVal--; 
      else
        startAttrVal = 0;
    }
    mOLStateStack.AppendElement(olState(startAttrVal, PR_TRUE));
  }

  if (mIsCopying && name == nsGkAtoms::li) {
    mIsFirstChildOfOL = IsFirstChildOfOL(aOriginalElement);
    if (mIsFirstChildOfOL){
      // If OL is parent of this LI, serialize attributes in different manner.
      SerializeLIValueAttribute(aElement, aStr);
    }
  }

  // Even LI passed above have to go through this 
  // for serializing attributes other than "value".
  nsAutoString dummyPrefix;
  SerializeAttributes(content, aOriginalElement, dummyPrefix, EmptyString(), name, aStr);

  AppendToString(kGreaterThan, aStr);

  if (name == nsGkAtoms::script ||
      name == nsGkAtoms::style ||
      name == nsGkAtoms::noscript ||
      name == nsGkAtoms::noframes) {
    ++mDisableEntityEncoding;
  }

  if ((mDoFormat || forceFormat) && !mPreLevel &&
    !mDoRaw && LineBreakAfterOpen(content->GetNameSpaceID(), name)) {
    AppendNewLineToString(aStr);
  }

  AfterElementStart(content, aOriginalElement, aStr);

  return NS_OK;
}
  
NS_IMETHODIMP 
nsHTMLContentSerializer::AppendElementEnd(nsIDOMElement *aElement,
                                          nsAString& aStr)
{
  NS_ENSURE_ARG(aElement);

  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  if (!content) return NS_ERROR_FAILURE;

  nsIAtom *name = content->Tag();

  if (name == nsGkAtoms::script ||
      name == nsGkAtoms::style ||
      name == nsGkAtoms::noscript ||
      name == nsGkAtoms::noframes) {
    --mDisableEntityEncoding;
  }

  PRBool forceFormat = content->HasAttr(kNameSpaceID_None,
                                        nsGkAtoms::mozdirty);

  if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {
    DecrIndentation(name);
  }

  if (name == nsGkAtoms::script) {
    nsCOMPtr<nsIScriptElement> script = do_QueryInterface(aElement);

    if (script && script->IsMalformed()) {
      // We're looking at a malformed script tag. This means that the end tag
      // was missing in the source. Imitate that here by not serializing the end
      // tag.
      --mPreLevel;
      return NS_OK;
    }
  }
  else if (mIsCopying && name == nsGkAtoms::ol) {
    NS_ASSERTION((!mOLStateStack.IsEmpty()), "Cannot have an empty OL Stack");
    /* Though at this point we must always have an state to be deleted as all 
    the OL opening tags are supposed to push an olState object to the stack*/
    if (!mOLStateStack.IsEmpty()) {
      mOLStateStack.RemoveElementAt(mOLStateStack.Length() -1);
    }
  }
  
  nsIParserService* parserService = nsContentUtils::GetParserService();

  if (parserService) {
    PRBool isContainer;

    parserService->IsContainer(parserService->HTMLAtomTagToId(name),
                               isContainer);
    if (!isContainer)
      return NS_OK;
  }

  if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {

    PRBool lineBreakBeforeClose = LineBreakBeforeClose(content->GetNameSpaceID(), name);

    if (mColPos && lineBreakBeforeClose) {
      AppendNewLineToString(aStr);
    }
    if (!mColPos) {
      AppendIndentation(aStr);
    }
    else if (mAddSpace) {
      AppendToString(PRUnichar(' '), aStr);
      mAddSpace = PR_FALSE;
    }
  }
  else if (mAddSpace) {
    AppendToString(PRUnichar(' '), aStr);
    mAddSpace = PR_FALSE;
  }

  nsAutoString nameStr;
  name->ToString(nameStr);

  AppendToString(kEndTag, aStr);
  AppendToString(nameStr.get(), -1, aStr);
  AppendToString(kGreaterThan, aStr);

  MaybeLeaveFromPreContent(content);

  if ((mDoFormat || forceFormat) && !mPreLevel
      && !mDoRaw && LineBreakAfterClose(content->GetNameSpaceID(), name)) {
    AppendNewLineToString(aStr);
  }
  else {
    MaybeFlagNewlineForRootNode(aElement);
  }

  if (name == nsGkAtoms::body) {
    --mInBody;
  }

  return NS_OK;
}

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