Numeric.inc

<?php


/**
 * CSS Compressor [VERSION]
 * [DATE]
 * Corey Hart @ http://www.codenothing.com
 */
class CSSCompression_Numeric {
    
    /**
     * Numeric Patterns
     *
     * @class Control: Compression Controller
     * @param (array) options: Reference to options
     * @param (regex) rdecimal: Checks for zero decimal
     * @param (regex) rzero: Checks for preceding 0 to decimal unit
     * @param (regex) runit: Checks for suffix on 0 unit
     */
    private $Control;
    private $options = array();
    private $rdecimal = "/^(\\+|\\-)?(\\d*\\.[1-9]*0*)(\\%|[a-z]{2})\$/i";
    private $rzero = "/^(\\+|\\-)?0(\\.\\d+)(\\%|[a-z]{2})?\$/i";
    private $runit = "/^0(\\%|[a-z]{2})\$/i";
    
    /**
     * Stash a reference to the controller on each instantiation
     *
     * @param (class) control: CSSCompression Controller
     */
    public function __construct(CSSCompression_Control $control) {
        $this->Control = $control;
        $this->options =& $control->Option->options;
    }
    
    /**
     * Runs all numeric operations
     *
     * @param (string) str: Unit string
     */
    public function numeric($str) {
        $str = $this->decimal($str);
        $str = $this->zeroes($str);
        $str = $this->units($str);
        return $str;
    }
    
    /**
     * Remove's unecessary decimal, ie 13.0px => 13px
     *
     * @param (string) str: Unit string
     */
    private function decimal($str) {
        if (preg_match($this->rdecimal, $str, $match)) {
            $str = ($match[1] == '-' ? '-' : '') . floatval($match[2]) . $match[3];
        }
        return $str;
    }
    
    /**
     * Removes suffix from 0 unit, ie 0px; => 0;
     *
     * @param (string) str: Unit string
     */
    private function units($str) {
        if (preg_match($this->runit, $str, $match)) {
            $str = '0';
        }
        return $str;
    }
    
    /**
     * Removes leading zero in decimal, ie 0.33px => .33px
     *
     * @param (string) str: Unit string
     */
    private function zeroes($str) {
        if (preg_match($this->rzero, $str, $match)) {
            $str = (isset($match[1]) && $match[1] == '-' ? '-' : '') . $match[2] . (isset($match[3]) ? $match[3] : '');
        }
        return $str;
    }
    
    /**
     * Access to private methods for testing
     *
     * @param (string) method: Method to be called
     * @param (array) args: Array of paramters to be passed in
     */
    public function access($method, $args) {
        if (method_exists($this, $method)) {
            return call_user_func_array(array(
                $this,
                $method,
            ), $args);
        }
        else {
            throw new CSSCompression_Exception("Unknown method in Numeric Class - " . $method);
        }
    }

}