/*

* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Matches CSS patterns

*

*/

#ifndef CCSSPatternMatcher_H

#define CCSSPatternMatcher_H

//  INCLUDES

#include "CSSParser.h"

#include "CSSSelector.h"

#include "nw_evt_event.h"

#include "nw_hed_documentnode.h"

#include "nw_hed_domhelper.h"

#include <e32base.h>

// CONSTANTS

// MACROS

// DATA TYPES

// FORWARD DECLARATIONS

// CLASS DECLARATION

/**

*  This class contains information about the node

*  @lib css.lib

*  @since 2.1

*/

class CCSSNodeData : public CBase

{

public:

  // class Value of node

  NW_Ucs2* classVal;

  // idValue of node

  NW_Ucs2* idVal;

  // if node is link

  TBool isLink;

  // if associated url os visited

  TBool isVisited;

  // if url is cached

  TBool isCached;

  // associated url;

  NW_Text_t* elementUrl;

  // constructor

	CCSSNodeData() 

    {  

      classVal = NULL;

      idVal = NULL;

      elementUrl = NULL;

      isCached = EFalse;

      isLink = EFalse;

      isVisited = EFalse;

    }

  // destructor

	virtual ~CCSSNodeData()

	{

    if (classVal)

    {

      NW_Mem_Free(classVal);

    }

    if (idVal)

    {

      NW_Mem_Free(idVal);

    }

    if (elementUrl)

    {

      NW_Object_Delete(elementUrl);

    }

  }

};

// CLASS DECLARATION

/**

*  This class matches patterns

*

*  @lib css.lib

*  @since 2.1

*/

class CCSSPatternMatcher : public CBase

{

  public:  // Constructors and destructor

    /**

    * Destructor.

    */

    virtual ~CCSSPatternMatcher(){};

    CCSSPatternMatcher(NW_WBXML_Dictionary_t* aDictionary, 

                       NW_HED_DocumentNode_t* aOwner,

                       NW_HED_DomHelper_t* aDomHelper)

    {

      iDictionary = aDictionary;

      iOwner = aOwner;

      iDomHelper = aDomHelper;

    }

  public: // New functions

    /**

    * This function matches selector pattern to element node using lazy parsing

    * @since 2.1

    * @param aElementNode: element node for which pattern needs to be matched

    * @param aParser: parser initialized to beginning of selector

    * @param aSelector: selector to be matched

    * @param aEvent: event 

    * @param aNodeData: node specific data containing class, id information

    * @return NW_FALSE if pattern not matched or NW_TRUE if pattern matches

    */

    TBool MatchPatternLazyL(NW_DOM_ElementNode_t* aElementNode,

                        TCSSParser* aParser,

                        NW_Byte* aSelector,

                        const NW_Evt_Event_t* aEvent,

                        CCSSNodeData* aNodeData);

    /**

    * This function matches selector pattern to element node

    * @since 2.1

    * @param aElementNode: element node for which pattern needs to be matched

    * @param aParser: parser initialized to beginning of selector

    * @param aSelector: selector to be matched

    * @param aEvent: event 

    * @param aNodeData: node specific data containing class, id information

    * @return NW_FALSE if pattern not matched or NW_TRUE if pattern matches

    */

    TBool MatchPatternL(NW_DOM_ElementNode_t* aElementNode,

                        CCSSSelector* aSelector,

                        const NW_Evt_Event_t* aEvent,

                        CCSSNodeData* aNodeData);

  private: // New functions

    // data associated with a simple selector

    struct TSimpleSelectorData

    {

      TCSSReaderUnit nameSpace;

      TUint16 elementToken;

      TText8* conditionListHandle;

      TUint16 simpleSelectorNum;

    };

    /**

    * This function matches selector pattern to element node

    * using lazy parsing

    * @since 2.1

    * @param aElementNode: element node for which pattern needs to be matched

    * @param aParser: parser initialized to beginning of selector

    * @param aEvent: event 

    * @param aNodeData: node specific data containing class, id information

    * @param aConditionListHandle pointer to beginning of conditions

    * @return NW_FALSE if conditions not matched or NW_TRUE if conditions matches

    */

    TBool MatchConditionLazyL(NW_DOM_ElementNode_t* aElementNode, 

                            NW_Byte* aConditionListHandle,

                            TCSSParser* aParser,

                            const NW_Evt_Event_t* aEvent,

                            CCSSNodeData* aNodeData);

    /**

    * This function matches selector pattern to element node

    * @since 2.1

    * @param aElementNode: element node for which pattern needs to be matched

    * @param aParser: parser initialized to beginning of selector

    * @param aEvent: event 

    * @param aNodeData: node specific data containing class, id information

    * @param aConditionList: list of conditions

    * @return NW_FALSE if conditions not matched or NW_TRUE if conditions matches

    */

    TBool MatchConditionL(NW_DOM_ElementNode_t* aElementNode, 

                            CCSSConditionList* aConditionList,

                            const NW_Evt_Event_t* aEvent,

                            CCSSNodeData* aNodeData);

    /**

    * This function gets the data associated with a simple selector (iterator method)

    * @since 2.1

    * @param aParser: parser to parse selector

    * @param aSelector: selector to be matched

    * @param aEvent: event 

    * @param aNodeData(OUT): node specific data containing class, id information

    * @return KBrsrIterateDone (if all simple selectors are parsed)

    *         KBrsrIterateMore (if more simple selectors need to be parsed)

    */

    TBrowserStatusCode GetNextSimpleSelectorL(TCSSParser* aParser,

                                      NW_Byte* aSelector,

                                      TSimpleSelectorData& aData);

    /**

    * This function matches selector pattern to element node

    * @since 2.1

    * @param aElementNode: element node whose url is to be matched

    * @return url associated with href

    */

    NW_Text_t* GetElementURLL(NW_DOM_ElementNode_t* aElementNode);

    /**

    * This function returns true if url is in history stack

    * @since 2.1

    * @param aElementNode: element node whose url is to be searched

    * @return true (if url is in history stack), otherwise false

    */

    TBool UrlInHistory(NW_DOM_ElementNode_t* aElementNode);

    /**

    * This function returns true if url is in cache

    * @since 2.1

    * @param aElementNode: element node whose url is to be searched

    * @return true (if url is in cache), otherwise false

    */

    TBool UrlInCache(NW_DOM_ElementNode_t* aElementNode);

    /**

    * This function returns true if url is in cache

    * @since 2.1

    * @param aParser: parser to parse selector

    * @param aSelector: selector to be matched

    * @param aData: simpleselector data

    * @return KBrsrSuccess or KBrsrFailure

    */

    TBrowserStatusCode InitSimpleSelectorData(TCSSParser* aParser, NW_Byte* aSelector, TSimpleSelectorData& aData);

  private:    // Data

    // dictionary for document

    NW_WBXML_Dictionary_t* iDictionary;

    // document 

    NW_HED_DocumentNode_t* iOwner;

    // domHelper for resolving entities

    NW_HED_DomHelper_t* iDomHelper;

};

#endif /* CCSSPatternMatcher_H */