library/HTMLPurifier/Length.php

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<?php

class HTMLPurifier_Length
{
    
    protected $n;
    
    protected $unit;
    
    protected $isValid;
    
    protected static $allowedUnits = array(
        'em' => true, 'ex' => true, 'px' => true, 'in' => true,
        'cm' => true, 'mm' => true, 'pt' => true, 'pc' => true
    );
    
    public function __construct($n = '0', $u = false) {
        $this->n = (string) $n;
        $this->unit = $u !== false ? (string) $u : false;
    }
    
    static public function make($s) {
        if ($s instanceof HTMLPurifier_Length) return $s;
        $n_length = strspn($s, '1234567890.+-');
        $n = substr($s, 0, $n_length);
        $unit = substr($s, $n_length);
        if ($unit === '') $unit = false;
        return new HTMLPurifier_Length($n, $unit);
    }
    
    protected function validate() {
        // Special case:
        if ($this->n === '+0' || $this->n === '-0') $this->n = '0';
        if ($this->n === '0' && $this->unit === false) return true;
        if (!ctype_lower($this->unit)) $this->unit = strtolower($this->unit);
        if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) return false;
        // Hack:
        $def = new HTMLPurifier_AttrDef_CSS_Number();
        $result = $def->validate($this->n, false, false);
        if ($result === false) return false;
        $this->n = $result;
        return true;
    }
    
    public function toString() {
        if (!$this->isValid()) return false;
        return $this->n . $this->unit;
    }
    
    public function getN() {return $this->n;}
    
    public function getUnit() {return $this->unit;}
    
    public function isValid() {
        if ($this->isValid === null) $this->isValid = $this->validate();
        return $this->isValid;
    }
    
    public function compareTo($l) {
        if ($l === false) return false;
        if ($l->unit !== $this->unit) {
            $converter = new HTMLPurifier_UnitConverter();
            $l = $converter->convert($l, $this->unit);
            if ($l === false) return false;
        }
        return $this->n - $l->n;
    }
    
}

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