<?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 object
    *
    * @return object 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;
    }
}