/*

* 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:  CSS Lexer

*

*/

#ifndef TCSSReader_H

#define TCSSReader_H

//  INCLUDES

#include "nwx_defs.h"

#include "nw_string_string.h"

#include <e32std.h>

// CONSTANTS

// MACROS

// DATA TYPES

enum TCSSReaderTokenType{

  SPACE = 1,

  ATKEYWORD,

  HASH,

  ASTERISK,

  COMMA,

  DOT,

  COLON,

  HYPHEN,

  SEMI_COLON,

  LEFT_BRACE,

  RIGHT_BRACE,

  LEFT_BRACKET,

  RIGHT_BRACKET,

  EQUALS,

  CHARSET_RULE,

  IMPORT_RULE,

  MEDIA_RULE,

  LINK_PSEUDO_CLASS,

  VISITED_PSEUDO_CLASS,

  FOCUS_PSEUDO_CLASS,

  ACTIVE_PSEUDO_CLASS,

  CACHED_PSEUDO_CLASS,

  IMPORTANT,

  VERTICAL_LINE,

  CDO,

  CDC,

  BUFFER_END,

  IDENTIFIER,

  EMS,

  EXS,

  PXS,

  INS,

  CMS,

  MMS,

  PTS,

  PERCENTAGE,

  PCS,

  NUMBER,

  URI,

  RGB,

  STRING,

  RIGHT_PARENTHESIS,

  DIGIT,

  ALPHA,

  INVALID

};

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

// CLASS DECLARATION

/**

*  This class is a unit of text

*  @lib css.lib

*  @since 2.1

*/

class TCSSReaderUnit

{

  public:

    // constructor

	  TCSSReaderUnit(TText8* aStorage, TUint32 aLength, TUint32 aNumChars)

      {

        iStorage = aStorage;

        iLength = aLength;

        iNumChars = aNumChars;

      }

    TCSSReaderUnit()

      {

        iStorage = NULL;

        iLength = 0;

        iNumChars = 0;

      }

	  void Init(TText8* aStorage, TUint32 aLength, TUint32 aNumChars)

      {

        iStorage = aStorage;

        iLength = aLength;

        iNumChars = aNumChars;

      }

    /**

    * Converts the text to unicode

    * @since 2.1

    * @param aEncoding: encoding of the document being parsed

    * return unicode String

    */

    TText16* GetUnicodeL(TUint32 aEncoding);

    TText16* GetUnicode(TUint32 aEncoding);

  public: //data

    // pointer to beginning of text

    TText8* iStorage;

    // length of storage

    TUint32 iLength;

    // number of character

    TUint32 iNumChars;

};

// CLASS DECLARATION

/**

*  This class is the lexer for CSS syntax

*  @lib css.lib

*  @since 2.1

*/

class TCSSReader

{

  public:

    // constructor

	  TCSSReader(TText8* aBuffer, TUint32 aLength, TUint32 aEncoding)

      {

        iBuffer = aBuffer;

        iLength = aLength;

        iEncoding = aEncoding;

        iPosition = 0;

      }

    TCSSReader()

      {

        iBuffer = NULL;

        iLength = 0;

        iEncoding = 0;

        iPosition = 0;

      }

    void Init(TText8* aBuffer, TUint32 aLength, TUint32 aEncoding)

      {

        iBuffer = aBuffer;

        iLength = aLength;

        iEncoding = aEncoding;

        iPosition = 0;

      }

    /**

    * Skips white space as defined by CSS2 Spec

    * @since 2.1

    * return void

    */

    void SkipWhiteSpaces();

    /**

    * Finds if the media type is valid (all or handheld)

    * @since 2.1

    * @param aMedia: media to be evaluated

    * return ETrue if media is valid else EFalse

    */

    TBool IsValidMedia(TCSSReaderUnit* aMedia);

    TInt8 ReadNextToken(TCSSReaderUnit* aStr);

    TInt8 GetPseudoClass();

    TInt8 ReadNumberToken(TCSSReaderUnit* aStr);

    TBool ReadIdentifier(TCSSReaderUnit* aStr);

    TBool ReadString(TCSSReaderUnit* aStr);

    TBool ReadName(TCSSReaderUnit* aStr);

    TBool ReadURI(TCSSReaderUnit* aStr);

    TBool ReadCharset();

    TBrowserStatusCode GoToToken(TUint8 aTokenType, TText8** aPosition);

    /**

    * Ignores the At-rule of CSS starting at given position

    * @since 2.1

    * @param aPosition - starting of At-Rule

    * return void

    */

    TBool IgnoreAtRule(TUint32 aPosition);

    /**

    * Sets position of the reader

    * @since 2.1

    * @param aPosition - position of reader

    * return void

    */

    inline void SetPosition(TUint32 aPosition){iPosition = aPosition;}

    /**

    * Returns pointer to the buffer

    * @since 2.1

    * return pointer to the buffer

    */

    inline TText8* GetBuffer(){return iBuffer;}

    /**

    * Returns length of buffer

    * @since 2.1

    * return length of buffer

    */

    inline TUint32 GetLength(){return iLength;}

    /**

    * Returns current position of reader

    * @since 2.1

    * return current position of reader

    */

    inline TUint32 GetPosition(){return iPosition;}

    /**

    * Returns encoding of buffer

    * @since 2.1

    * return encoding of buffer

    */

    inline TUint32 GetEncoding(){return iEncoding;}

    /**

    * Advances the buffer by certain number of bytes

    * @since 2.1

    * @param aNumBytes - number of bytes to advance

    * return void

    */

    TBool Advance(TUint32 aNumBytes);

    /**

    * Sets encoding of the document

    * @since 2.1

    * @param aEncoding - encoding of buffer

    * return void

    */

    inline void SetEncoding(TUint32 aEncoding){iEncoding = aEncoding;}

    /**

    * Returns pointer to the buffer storage where reader is positioned

    * @since 2.1

    * return pointer to the buffer storage where reader is positioned

    */

    inline TText8* GetBufferPointer(){return (iBuffer+iPosition);}

    /**

    * Gets the encoding associated with the text

    * @since 2.1

    * return encoding of the document being parsed

    */

    TUint32 GetCharsetVal();

    /**

    * Reads a character

    * @since 2.1

    * return encoding of the document being parsed

    */

    TInt32 ReadChar(TText16* aChar);

    TUint16 ReadEscape(TText16* aOutChar);

  private:    // Functions

    TBool Equals(const TText16* aStr, TBool aCaseInsensitive);

    TBool ReadBlock(TText16 aClosingChar);

  private:    // Data

    // pointer to the CSS buffer

    TText8* iBuffer;

    // length of buffer

    TUint32 iLength;

    // encoding of buffer

    TUint32 iEncoding;

    // position in the buffer

    TUint32 iPosition;

};

#endif /* TCSSReader_H */