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/* -*- 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.org code.
 * The Initial Developer of the Original Code is
 * IBM Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2003
 * IBM Corporation. All Rights Reserved.
 * Contributor(s):
 *   IBM Corporation
 * Alternatively, the contents of this file may be used under the terms of
 * either 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"),
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 * Storage of the children and attributes of a DOM node; storage for
 * the two is unified to minimize footprint.

#ifndef nsAttrAndChildArray_h___
#define nsAttrAndChildArray_h___

#include "nscore.h"
#include "nsAttrName.h"
#include "nsAttrValue.h"

class nsINode;
class nsIContent;
class nsMappedAttributes;
class nsHTMLStyleSheet;
class nsRuleWalker;
class nsMappedAttributeElement;






#define ATTRSIZE (sizeof(InternalAttr) / sizeof(void*))

class nsAttrAndChildArray

  PRUint32 ChildCount() const
    return mImpl ? (mImpl->mAttrAndChildCount >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) : 0;
  nsIContent* ChildAt(PRUint32 aPos) const
    NS_ASSERTION(aPos < ChildCount(), "out-of-bounds access in nsAttrAndChildArray");
    return reinterpret_cast<nsIContent*>(mImpl->mBuffer[AttrSlotsSize() + aPos]);
  nsIContent* GetSafeChildAt(PRUint32 aPos) const;
  nsresult AppendChild(nsIContent* aChild)
    return InsertChildAt(aChild, ChildCount());
  nsresult InsertChildAt(nsIContent* aChild, PRUint32 aPos);
  void RemoveChildAt(PRUint32 aPos);
  PRInt32 IndexOfChild(nsINode* aPossibleChild) const;

  PRUint32 AttrCount() const;
  const nsAttrValue* GetAttr(nsIAtom* aLocalName, PRInt32 aNamespaceID = kNameSpaceID_None) const;
  const nsAttrValue* AttrAt(PRUint32 aPos) const;
  nsresult SetAttr(nsIAtom* aLocalName, const nsAString& aValue);
  nsresult SetAndTakeAttr(nsIAtom* aLocalName, nsAttrValue& aValue);
  nsresult SetAndTakeAttr(nsINodeInfo* aName, nsAttrValue& aValue);

  // Remove the attr at position aPos.  The value of the attr is placed in
  // aValue; any value that was already in aValue is destroyed.
  nsresult RemoveAttrAt(PRUint32 aPos, nsAttrValue& aValue);

  // Returns attribute name at given position, *not* out-of-bounds safe
  const nsAttrName* AttrNameAt(PRUint32 aPos) const;

  // Returns attribute name at given position or null if aPos is out-of-bounds
  const nsAttrName* GetSafeAttrNameAt(PRUint32 aPos) const;

  // aName is UTF-8 encoded
  const nsAttrName* GetExistingAttrNameFromQName(const nsACString& aName) const;
  PRInt32 IndexOfAttr(nsIAtom* aLocalName, PRInt32 aNamespaceID = kNameSpaceID_None) const;

  nsresult SetAndTakeMappedAttr(nsIAtom* aLocalName, nsAttrValue& aValue,
                                nsMappedAttributeElement* aContent,
                                nsHTMLStyleSheet* aSheet);
  nsresult SetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet);
  void WalkMappedAttributeStyleRules(nsRuleWalker* aRuleWalker);

  void Compact();

  nsAttrAndChildArray(const nsAttrAndChildArray& aOther); // Not to be implemented
  nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther); // Not to be implemented

  void Clear();

  PRUint32 NonMappedAttrCount() const;
  PRUint32 MappedAttrCount() const;

  nsresult GetModifiableMapped(nsMappedAttributeElement* aContent,
                               nsHTMLStyleSheet* aSheet,
                               PRBool aWillAddAttr,
                               nsMappedAttributes** aModifiable);
  nsresult MakeMappedUnique(nsMappedAttributes* aAttributes);

  PRUint32 AttrSlotsSize() const
    return AttrSlotCount() * ATTRSIZE;

  PRUint32 AttrSlotCount() const
    return mImpl ? mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK : 0;

  void SetChildCount(PRUint32 aCount)
    mImpl->mAttrAndChildCount = 
        (mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |

  void SetAttrSlotCount(PRUint32 aCount)
    mImpl->mAttrAndChildCount =
        (mImpl->mAttrAndChildCount & ~ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |

  void SetAttrSlotAndChildCount(PRUint32 aSlotCount, PRUint32 aChildCount)
    mImpl->mAttrAndChildCount = aSlotCount |

  PRBool GrowBy(PRUint32 aGrowSize);
  PRBool AddAttrSlot();

  struct InternalAttr
    nsAttrName mName;
    nsAttrValue mValue;

  struct Impl {
    PRUint32 mAttrAndChildCount;
    PRUint32 mBufferSize;
    nsMappedAttributes* mMappedAttrs;
    void* mBuffer[1];

  Impl* mImpl;


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