<?php

/**
 * Represents a Length as defined by CSS.
 */
class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef {
	
	/**
	 * @type HTMLPurifier_Length|string
	 */
	protected $min;
	
	/**
	 * @type HTMLPurifier_Length|string
	 */
	protected $max;
	
	/**
	 *
	 * @param HTMLPurifier_Length|string $min
	 *        	Minimum length, or null for no bound. String is also acceptable.
	 * @param HTMLPurifier_Length|string $max
	 *        	Maximum length, or null for no bound. String is also acceptable.
	 */
	public function __construct($min = null, $max = null) {
		$this->min = $min !== null ? HTMLPurifier_Length::make ( $min ) : null;
		$this->max = $max !== null ? HTMLPurifier_Length::make ( $max ) : null;
	}
	
	/**
	 *
	 * @param string $string        	
	 * @param HTMLPurifier_Config $config        	
	 * @param HTMLPurifier_Context $context        	
	 * @return bool|string
	 */
	public function validate($string, $config, $context) {
		$string = $this->parseCDATA ( $string );
		
		// Optimizations
		if ($string === '') {
			return false;
		}
		if ($string === '0') {
			return '0';
		}
		if (strlen ( $string ) === 1) {
			return false;
		}
		
		$length = HTMLPurifier_Length::make ( $string );
		if (! $length->isValid ()) {
			return false;
		}
		
		if ($this->min) {
			$c = $length->compareTo ( $this->min );
			if ($c === false) {
				return false;
			}
			if ($c < 0) {
				return false;
			}
		}
		if ($this->max) {
			$c = $length->compareTo ( $this->max );
			if ($c === false) {
				return false;
			}
			if ($c > 0) {
				return false;
			}
		}
		return $length->toString ();
	}
}

// vim: et sw=4 sts=4