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efrain |
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<?php
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/**
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* Validates an integer.
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* @note While this class was modeled off the CSS definition, no currently
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* allowed CSS uses this type. The properties that do are: widows,
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* orphans, z-index, counter-increment, counter-reset. Some of the
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* HTML attributes, however, find use for a non-negative version of this.
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*/
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class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
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{
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/**
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* Whether or not negative values are allowed.
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* @type bool
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*/
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protected $negative = true;
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/**
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* Whether or not zero is allowed.
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* @type bool
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*/
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protected $zero = true;
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/**
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* Whether or not positive values are allowed.
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* @type bool
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*/
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protected $positive = true;
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/**
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* @param $negative Bool indicating whether or not negative values are allowed
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* @param $zero Bool indicating whether or not zero is allowed
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* @param $positive Bool indicating whether or not positive values are allowed
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*/
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public function __construct($negative = true, $zero = true, $positive = true)
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{
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$this->negative = $negative;
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$this->zero = $zero;
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$this->positive = $positive;
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}
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/**
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* @param string $integer
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($integer, $config, $context)
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{
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$integer = $this->parseCDATA($integer);
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if ($integer === '') {
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return false;
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}
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// we could possibly simply typecast it to integer, but there are
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// certain fringe cases that must not return an integer.
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// clip leading sign
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if ($this->negative && $integer[0] === '-') {
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$digits = substr($integer, 1);
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if ($digits === '0') {
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$integer = '0';
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} // rm minus sign for zero
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} elseif ($this->positive && $integer[0] === '+') {
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$digits = $integer = substr($integer, 1); // rm unnecessary plus
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} else {
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$digits = $integer;
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}
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// test if it's numeric
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if (!ctype_digit($digits)) {
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return false;
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}
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// perform scope tests
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if (!$this->zero && $integer == 0) {
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return false;
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}
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if (!$this->positive && $integer > 0) {
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return false;
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}
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if (!$this->negative && $integer < 0) {
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return false;
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}
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return $integer;
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}
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}
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// vim: et sw=4 sts=4
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