CssMinifier.phpclass

<?php
/**************************************************************************************************************

    NAME
        CssMinifier.phpclass

    DESCRIPTION
        Minifier for css sources.

    AUTHOR
        Christian Vigh, 10/2015.

    HISTORY
    [Version : 1.0]    [Date : 2015/10/16]     [Author : CV]
        Initial version.

 **************************************************************************************************************/

 require_once ( dirname ( __FILE__ ) . "/Minifier.phpclass" ) ;


/*==============================================================================================================

    CssMinifier class -
        Minifier for javascript sources.

  ==============================================================================================================*/
class	CssMinifier	extends  Minifier 
   {
	/*--------------------------------------------------------------------------------------------------------------

	   Constructor -
		Initializes the parent minifier class.
	 
	 *-------------------------------------------------------------------------------------------------------------*/
	public function  __construct ( )
	   {
		static	$single_comments	= [] ;
		static  $multi_comments		=  
		   [
			   [
				'start'		=>  '/*',
				'end'		=>  '*/',
				'nested'	=>  false 
			    ]
		    ] ;

		static	$quoted_strings		=
		   [
			   [
				'quote'		=>  '"'
			    ],
			   [
				'quote'		=>  "'"
			    ]
		    ] ;

		static  $tokens			=
		   [
			':', ';', '{', '}', ','
		    ] ;

		$this -> SetComments		( $single_comments, $multi_comments ) ;
		$this -> SetQuotedStrings	( $quoted_strings ) ;
		$this -> SetContinuation	( "\\" ) ;
		$this -> SetIdentifierRegex	( '[a-z0-9_.#\-\$][a-z0-9_.#\-\$]*' ) ;
		$this -> SetTokens		( $tokens ) ;

		parent::__construct ( ) ;
	    }


	/*--------------------------------------------------------------------------------------------------------------

	   MinifyData -
		Process the input stream.
	 
	 *-------------------------------------------------------------------------------------------------------------*/
	protected function  MinifyData ( )
	   {
		$data		=  '' ;
		$offset		=  0 ;
		$token		=  null ;
		$token_type	=  self::TOKEN_NONE ;

		while ( $this -> GetNextToken ( $offset, $token, $token_type ) )
		   {
			switch ( $token )
			   {
				case	"\n" :
					break ;

				default :
					if  ( $token_type  ==  self::TOKEN_IDENTIFIER ) 
						$token	.=  ' ' ;
					else if  ( $token_type  ==  self::TOKEN_ELEMENT )
						$data    =  rtrim ( $data ) ;

					$data	.=  $token ;
			    }
		    }

		return ( $data ) ;
	    }

    }