<?php

/* Based on a class by Michael Ettl(michael@ettl.com) */

class CSS
{	
	protected $css;
	protected $cssprops;
	protected $cssstr;

	/**
    * Constructor function for PHP5
    * 
    */
	public function __construct() 
	{
		$this->css = array();
		$this->cssprops = array();
		$this->cssstr = "";
	}
	
	/**
    * Parses an entire CSS file
    * 
    * @param mixed $filename CSS File to parse
    */
	public function parse_file($file_name)  
	{
		$fh = fopen($file_name, "r") or die("Error opening file $file_name");
		$css_str = fread($fh, filesize($file_name));
		fclose($fh);
		return($this->parse_css($css_str));
	}

	/**
    * Parses a CSS string
    * 
    * @param string $css_str CSS to parse
    */
	public function parse_css($css_str) 
	{
		$this->cssstr = $css_str;
		$this->css = "";
		$this->cssprops = "";

		// Strip all line endings and both single and multiline comments
		$css_str = preg_replace("/\/\*.+?\*\//s", "", $css_str);

		$css_class = explode("}", $css_str);
		
		while(list($key, $val) = each($css_class)){
		    $aCSSObj = explode("{", $val);
		    $cSel = strtolower(trim($aCSSObj[0]));
			if($cSel){
				$this->cssprops[] = $cSel;
	    	    $a = explode(";", $aCSSObj[1]);
	    	    while(list($key, $val0) = each($a)){
					if(trim($val0)){	  
						$aCSSSub = explode(":", $val0);
						$cAtt = strtolower(trim($aCSSSub[0]));
						if(isset($aCSSSub[1])){
							$aCSSItem[$cAtt] = trim($aCSSSub[1]);
						} 
	    	      	}
	    	    }
	    	    if((isset($this->css[$cSel])) && ($this->css[$cSel])){
	    	    	$aCSSItem = array_merge($this->css[$cSel], $aCSSItem);
	    	    }	    	    	
	    	    $this->css[$cSel] = $aCSSItem;
	    	    unset($aCSSItem);
			}
			if(strstr($cSel, ",")){
				$aTags = explode(",", $cSel);
				foreach($aTags as $key0 => $value0){
					$this->css[$value0] = $this->css[$cSel];
				}
				unset($this->css[$cSel]);
			}				
		} 
		unset($css_str, $css_class, $aCSSSub, $aCSSItem, $aCSSObj);
		return $this->css;
	}

    /**
    * Builds a CSS string out of an existing object
    * 
    * @param boolean $sorted Sort the attributes alphabetically
    * @return string Resulting CSS string
    */
	public function build_css($sorted = false) 
	{
		$this->cssstr = "";		
		foreach($this->css as $key0 => $value0) {
			$trimmed = trim($key0);
			$this->cssstr .= "$trimmed {\n";
			if($sorted) ksort($this->css[$key0], SORT_STRING);
			foreach($this->css[$key0] as $key1 => $value1) {
				$this->cssstr .= "\t$key1: $value1;\n";
			}
			$this->cssstr .= "}\n";
		}
		return ($this->cssstr);
	}
	
    /**
    * Writes an existing CSS string to file
    * 
    * @param string $file_name File to save to
    * @param boolean $sorted Sort the attributes alphabetically
    */
	public function write_file($file_name, $sorted = false)
	{
		if($this->css == "") die("There is no CSS to write!");
		if($this->cssstr == "") $this->build_css($sorted);
		$fh = fopen($file_name, "w") or die("Error opening file $file_name");
		fwrite($fh, $this->cssstr);
		fclose($fh);	
	}
	
    /**
    * Returns the entire CSS array
    * 
    * @return array or false
    */
	public function get_css()
	{
		if (isset($this->css)) return ($this->css);	
		return false;		
	}
	
    /**
    * Returns all CSS properties
    * 
    * @return array
    */
	public function get_properties()
	{
		if (isset($this->cssprops)) return ($this->cssprops);	
		return array();		
	}
	
    /**
    * Returns a specified CSS property and all its attributes
    * 
    * @param string $property
    * @return array
    */
	public function get_property($prop)
	{
		if (isset($this->css[$prop])) return ($this->css[$prop]);	
		return array();		
	}
	
    /**
    * Gets attribute value of a specified CSS property
    * 
    * @param string $prop CSS property
    * @param string $attr CSS attribute
    * @return string
    */
	public function get_value($prop, $attr)
	{
		if (isset($this->css[$prop][$attr])) return ($this->css[$prop][$attr]);	
		return "";
	}
	
    /**
    * Sets attribute value of a specified CSS property
    * 
    * @param string $prop CSS property
    * @param string $attr CSS attribute
    * @param string $value CSS attribute value
    * @return boolean Returns true when succeeded
    */
	public function set_value($prop, $attr, $value)
	{
		if(empty($prop)||empty($attr)) return false;
		$this->css[$prop][$attr] = $value;
        return true;
	}
}