~ubuntu-branches/ubuntu/karmic/xulrunner-1.9/karmic

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* ***** 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 Communicator client 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):

 *

 * 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 ***** */

#include "nsIDOMHTMLLinkElement.h"

#include "nsIDOMLinkStyle.h"

#include "nsIDOMEventTarget.h"

#include "nsGenericHTMLElement.h"

#include "nsILink.h"

#include "nsGkAtoms.h"

#include "nsStyleConsts.h"

#include "nsPresContext.h"

#include "nsIDOMStyleSheet.h"

#include "nsIStyleSheet.h"

#include "nsIStyleSheetLinkingElement.h"

#include "nsStyleLinkElement.h"

#include "nsReadableUtils.h"

#include "nsUnicharUtils.h"

#include "nsIURL.h"

#include "nsNetUtil.h"

#include "nsIDocument.h"

#include "nsIDOMEvent.h"

#include "nsIPrivateDOMEvent.h"

#include "nsIDOMDocumentEvent.h"

#include "nsIDOMEventTarget.h"

#include "nsParserUtils.h"

#include "nsContentUtils.h"

#include "nsPIDOMWindow.h"

#include "nsPLDOMEvent.h"

class nsHTMLLinkElement : public nsGenericHTMLElement,

                          public nsIDOMHTMLLinkElement,

                          public nsILink,

                          public nsStyleLinkElement

{

public:

  nsHTMLLinkElement(nsINodeInfo *aNodeInfo);

  virtual ~nsHTMLLinkElement();

  // nsISupports

  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode

  NS_FORWARD_NSIDOMNODE(nsGenericHTMLElement::)

  // nsIDOMElement

  NS_FORWARD_NSIDOMELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLElement

  NS_FORWARD_NSIDOMHTMLELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLLinkElement

  NS_DECL_NSIDOMHTMLLINKELEMENT

  // nsILink

  NS_IMETHOD    GetLinkState(nsLinkState &aState);

  NS_IMETHOD    SetLinkState(nsLinkState aState);

  NS_IMETHOD    GetHrefURI(nsIURI** aURI);

  NS_IMETHOD    LinkAdded();

  NS_IMETHOD    LinkRemoved();

  virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,

                              nsIContent* aBindingParent,

                              PRBool aCompileEventHandlers);

  virtual void UnbindFromTree(PRBool aDeep = PR_TRUE,

                              PRBool aNullParent = PR_TRUE);

  void CreateAndDispatchEvent(nsIDocument* aDoc, const nsAString& aEventName);

  nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,

                   const nsAString& aValue, PRBool aNotify)

  {

    return SetAttr(aNameSpaceID, aName, nsnull, aValue, aNotify);

  }

  virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,

                           nsIAtom* aPrefix, const nsAString& aValue,

                           PRBool aNotify);

  virtual nsresult UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute,

                             PRBool aNotify);

  virtual nsresult PreHandleEvent(nsEventChainPreVisitor& aVisitor);

  virtual nsresult PostHandleEvent(nsEventChainPostVisitor& aVisitor);

  virtual PRBool IsLink(nsIURI** aURI) const;

  virtual void GetLinkTarget(nsAString& aTarget);

  virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const;

protected:

  virtual void GetStyleSheetURL(PRBool* aIsInline,

                                nsIURI** aURI);

  virtual void GetStyleSheetInfo(nsAString& aTitle,

                                 nsAString& aType,

                                 nsAString& aMedia,

                                 PRBool* aIsAlternate);

  // The cached visited state

  nsLinkState mLinkState;

};

NS_IMPL_NS_NEW_HTML_ELEMENT(Link)

nsHTMLLinkElement::nsHTMLLinkElement(nsINodeInfo *aNodeInfo)

  : nsGenericHTMLElement(aNodeInfo),

    mLinkState(eLinkState_Unknown)

{

}

nsHTMLLinkElement::~nsHTMLLinkElement()

{

}

NS_IMPL_ADDREF_INHERITED(nsHTMLLinkElement, nsGenericElement) 

NS_IMPL_RELEASE_INHERITED(nsHTMLLinkElement, nsGenericElement) 

// QueryInterface implementation for nsHTMLLinkElement

NS_HTML_CONTENT_INTERFACE_TABLE_HEAD(nsHTMLLinkElement, nsGenericHTMLElement)

  NS_INTERFACE_TABLE_INHERITED4(nsHTMLLinkElement,

                                nsIDOMHTMLLinkElement,

                                nsIDOMLinkStyle,

                                nsILink,

                                nsIStyleSheetLinkingElement)

NS_HTML_CONTENT_INTERFACE_TABLE_TAIL_CLASSINFO(HTMLLinkElement)

NS_IMPL_ELEMENT_CLONE(nsHTMLLinkElement)

NS_IMETHODIMP

nsHTMLLinkElement::GetDisabled(PRBool* aDisabled)

{

  nsCOMPtr<nsIDOMStyleSheet> ss(do_QueryInterface(GetStyleSheet()));

  nsresult result = NS_OK;

  if (ss) {

    result = ss->GetDisabled(aDisabled);

  } else {

    *aDisabled = PR_FALSE;

  }

  return result;

}

NS_IMETHODIMP 

nsHTMLLinkElement::SetDisabled(PRBool aDisabled)

{

  nsCOMPtr<nsIDOMStyleSheet> ss(do_QueryInterface(GetStyleSheet()));

  nsresult result = NS_OK;

  if (ss) {

    result = ss->SetDisabled(aDisabled);

  }

  return result;

}

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Charset, charset)

NS_IMPL_URI_ATTR(nsHTMLLinkElement, Href, href)

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Hreflang, hreflang)

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Media, media)

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Rel, rel)

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Rev, rev)

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Target, target)

NS_IMPL_STRING_ATTR(nsHTMLLinkElement, Type, type)

nsresult

nsHTMLLinkElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,

                              nsIContent* aBindingParent,

                              PRBool aCompileEventHandlers)

{

  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,

                                                 aBindingParent,

                                                 aCompileEventHandlers);

  NS_ENSURE_SUCCESS(rv, rv);

  UpdateStyleSheetInternal(nsnull);

  CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMLinkAdded"));

  return rv;  

}

NS_IMETHODIMP

nsHTMLLinkElement::LinkAdded()

{

  CreateAndDispatchEvent(GetOwnerDoc(), NS_LITERAL_STRING("DOMLinkAdded"));

  return NS_OK;

}

NS_IMETHODIMP

nsHTMLLinkElement::LinkRemoved()

{

  CreateAndDispatchEvent(GetOwnerDoc(), NS_LITERAL_STRING("DOMLinkRemoved"));

  return NS_OK;

}

void

nsHTMLLinkElement::UnbindFromTree(PRBool aDeep, PRBool aNullParent)

{

  nsCOMPtr<nsIDocument> oldDoc = GetCurrentDoc();

  if (oldDoc) {

    GetCurrentDoc()->ForgetLink(this);

    // If this link is ever reinserted into a document, it might

    // be under a different xml:base, so forget the cached state now

    mLinkState = eLinkState_Unknown;

  }

  // Once we have XPCOMGC we shouldn't need to call UnbindFromTree during Unlink

  // and so this messy event dispatch can go away.

  CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMLinkRemoved"));

  nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);

  UpdateStyleSheetInternal(oldDoc);

}

void

nsHTMLLinkElement::CreateAndDispatchEvent(nsIDocument* aDoc,

                                          const nsAString& aEventName)

{

  if (!aDoc)

    return;

  // In the unlikely case that both rev is specified *and* rel=stylesheet,

  // this code will cause the event to fire, on the principle that maybe the

  // page really does want to specify that it's author is a stylesheet. Since

  // this should never actually happen and the performance hit is minimal,

  // doing the "right" thing costs virtually nothing here, even if it doesn't

  // make much sense.

  static nsIContent::AttrValuesArray strings[] =

    {&nsGkAtoms::_empty, &nsGkAtoms::stylesheet, nsnull};

  if (!nsContentUtils::HasNonEmptyAttr(this, kNameSpaceID_None,

                                       nsGkAtoms::rev) &&

      FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::rel,

                      strings, eIgnoreCase) != ATTR_VALUE_NO_MATCH)

    return;

  nsRefPtr<nsPLDOMEvent> event = new nsPLDOMEvent(this, aEventName);

  if (event) {

    // If we have script blockers on the stack then we want to run as soon as

    // they are removed. Otherwise punt the runable to the event loop as we

    // don't know when it will be safe to run script.

    if (nsContentUtils::IsSafeToRunScript())

      event->PostDOMEvent();

    else

      event->RunDOMEventWhenSafe();

  }

}

nsresult

nsHTMLLinkElement::SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,

                           nsIAtom* aPrefix, const nsAString& aValue,

                           PRBool aNotify)

{

  if (aName == nsGkAtoms::href && kNameSpaceID_None == aNameSpaceID) {

    nsIDocument* doc = GetCurrentDoc();

    if (doc) {

      doc->ForgetLink(this);

        // The change to 'href' will cause style reresolution which will

        // eventually recompute the link state and re-add this element

        // to the link map if necessary.

    }

    SetLinkState(eLinkState_Unknown);

  }

  nsresult rv = nsGenericHTMLElement::SetAttr(aNameSpaceID, aName, aPrefix,

                                              aValue, aNotify);

  if (NS_SUCCEEDED(rv)) {

    PRBool dropSheet = PR_FALSE;

    if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::rel &&

        GetStyleSheet()) {

      nsStringArray linkTypes(4);

      nsStyleLinkElement::ParseLinkTypes(aValue, linkTypes);

      dropSheet = linkTypes.IndexOf(NS_LITERAL_STRING("stylesheet")) < 0;

    }

    UpdateStyleSheetInternal(nsnull,

                             dropSheet ||

                             (aNameSpaceID == kNameSpaceID_None &&

                              (aName == nsGkAtoms::title ||

                               aName == nsGkAtoms::media ||

                               aName == nsGkAtoms::type)));

  }

  return rv;

}

nsresult

nsHTMLLinkElement::UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute,

                             PRBool aNotify)

{

  nsresult rv = nsGenericHTMLElement::UnsetAttr(aNameSpaceID, aAttribute,

                                                aNotify);

  if (NS_SUCCEEDED(rv)) {

    UpdateStyleSheetInternal(nsnull,

                             aNameSpaceID == kNameSpaceID_None &&

                             (aAttribute == nsGkAtoms::rel ||

                              aAttribute == nsGkAtoms::title ||

                              aAttribute == nsGkAtoms::media ||

                              aAttribute == nsGkAtoms::type));

  }

  return rv;

}

nsresult

nsHTMLLinkElement::PreHandleEvent(nsEventChainPreVisitor& aVisitor)

{

  return PreHandleEventForAnchors(aVisitor);

}

nsresult

nsHTMLLinkElement::PostHandleEvent(nsEventChainPostVisitor& aVisitor)

{

  return PostHandleEventForAnchors(aVisitor);

}

PRBool

nsHTMLLinkElement::IsLink(nsIURI** aURI) const

{

  return IsHTMLLink(aURI);

}

void

nsHTMLLinkElement::GetLinkTarget(nsAString& aTarget)

{

  GetAttr(kNameSpaceID_None, nsGkAtoms::target, aTarget);

  if (aTarget.IsEmpty()) {

    GetBaseTarget(aTarget);

  }

}

NS_IMETHODIMP

nsHTMLLinkElement::GetLinkState(nsLinkState &aState)

{

  aState = mLinkState;

  return NS_OK;

}

NS_IMETHODIMP

nsHTMLLinkElement::SetLinkState(nsLinkState aState)

{

  mLinkState = aState;

  return NS_OK;

}

NS_IMETHODIMP

nsHTMLLinkElement::GetHrefURI(nsIURI** aURI)

{

  return GetHrefURIForAnchors(aURI);

}

void

nsHTMLLinkElement::GetStyleSheetURL(PRBool* aIsInline,

                                    nsIURI** aURI)

{

  *aIsInline = PR_FALSE;

  GetHrefURIForAnchors(aURI);

  return;

}

void

nsHTMLLinkElement::GetStyleSheetInfo(nsAString& aTitle,

                                     nsAString& aType,

                                     nsAString& aMedia,

                                     PRBool* aIsAlternate)

{

  aTitle.Truncate();

  aType.Truncate();

  aMedia.Truncate();

  *aIsAlternate = PR_FALSE;

  nsAutoString rel;

  nsStringArray linkTypes(4);

  GetAttr(kNameSpaceID_None, nsGkAtoms::rel, rel);

  nsStyleLinkElement::ParseLinkTypes(rel, linkTypes);

  // Is it a stylesheet link?

  if (linkTypes.IndexOf(NS_LITERAL_STRING("stylesheet")) < 0) {

    return;

  }

  nsAutoString title;

  GetAttr(kNameSpaceID_None, nsGkAtoms::title, title);

  title.CompressWhitespace();

  aTitle.Assign(title);

  // If alternate, does it have title?

  if (-1 != linkTypes.IndexOf(NS_LITERAL_STRING("alternate"))) {

    if (aTitle.IsEmpty()) { // alternates must have title

      return;

    } else {

      *aIsAlternate = PR_TRUE;

    }

  }

  GetAttr(kNameSpaceID_None, nsGkAtoms::media, aMedia);

  ToLowerCase(aMedia); // HTML4.0 spec is inconsistent, make it case INSENSITIVE

  nsAutoString mimeType;

  nsAutoString notUsed;

  GetAttr(kNameSpaceID_None, nsGkAtoms::type, aType);

  nsParserUtils::SplitMimeType(aType, mimeType, notUsed);

  if (!mimeType.IsEmpty() && !mimeType.LowerCaseEqualsLiteral("text/css")) {

    return;

  }

  // If we get here we assume that we're loading a css file, so set the

  // type to 'text/css'

  aType.AssignLiteral("text/css");

  return;

}