116 lines
3.1 KiB
PHP
116 lines
3.1 KiB
PHP
<?php
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/**
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* Represents a measurable length, with a string numeric magnitude
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* and a unit. This object is immutable.
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*/
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class HTMLPurifier_Length
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{
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/**
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* String numeric magnitude.
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*/
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protected $n;
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/**
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* String unit. False is permitted if $n = 0.
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*/
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protected $unit;
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/**
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* Whether or not this length is valid. Null if not calculated yet.
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*/
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protected $isValid;
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/**
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* Lookup array of units recognized by CSS 2.1
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*/
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protected static $allowedUnits = array(
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'em' => true, 'ex' => true, 'px' => true, 'in' => true,
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'cm' => true, 'mm' => true, 'pt' => true, 'pc' => true
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);
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/**
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* @param number $n Magnitude
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* @param string $u Unit
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*/
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public function __construct($n = '0', $u = false) {
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$this->n = (string) $n;
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$this->unit = $u !== false ? (string) $u : false;
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}
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/**
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* @param string $s Unit string, like '2em' or '3.4in'
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* @warning Does not perform validation.
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*/
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static public function make($s) {
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if ($s instanceof HTMLPurifier_Length) return $s;
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$n_length = strspn($s, '1234567890.+-');
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$n = substr($s, 0, $n_length);
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$unit = substr($s, $n_length);
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if ($unit === '') $unit = false;
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return new HTMLPurifier_Length($n, $unit);
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}
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/**
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* Validates the number and unit.
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*/
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protected function validate() {
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// Special case:
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if ($this->n === '+0' || $this->n === '-0') $this->n = '0';
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if ($this->n === '0' && $this->unit === false) return true;
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if (!ctype_lower($this->unit)) $this->unit = strtolower($this->unit);
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if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) return false;
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// Hack:
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$def = new HTMLPurifier_AttrDef_CSS_Number();
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$result = $def->validate($this->n, false, false);
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if ($result === false) return false;
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$this->n = $result;
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return true;
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}
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/**
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* Returns string representation of number.
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*/
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public function toString() {
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if (!$this->isValid()) return false;
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return $this->n . $this->unit;
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}
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/**
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* Retrieves string numeric magnitude.
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*/
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public function getN() {return $this->n;}
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/**
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* Retrieves string unit.
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*/
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public function getUnit() {return $this->unit;}
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/**
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* Returns true if this length unit is valid.
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*/
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public function isValid() {
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if ($this->isValid === null) $this->isValid = $this->validate();
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return $this->isValid;
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}
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/**
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* Compares two lengths, and returns 1 if greater, -1 if less and 0 if equal.
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* @warning If both values are too large or small, this calculation will
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* not work properly
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*/
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public function compareTo($l) {
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if ($l === false) return false;
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if ($l->unit !== $this->unit) {
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$converter = new HTMLPurifier_UnitConverter();
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$l = $converter->convert($l, $this->unit);
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if ($l === false) return false;
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}
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return $this->n - $l->n;
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}
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}
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// vim: et sw=4 sts=4
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