91 lines
2.2 KiB
PHP
91 lines
2.2 KiB
PHP
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<?php
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/**
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* Validates a number as defined by the CSS spec.
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*/
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class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
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{
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/**
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* Indicates whether or not only positive values are allowed.
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* @type bool
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*/
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protected $non_negative = false;
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/**
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* @param bool $non_negative indicates whether negatives are forbidden
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*/
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public function __construct($non_negative = false)
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{
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$this->non_negative = $non_negative;
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}
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/**
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* @param string $number
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return string|bool
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* @warning Some contexts do not pass $config, $context. These
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* variables should not be used without checking HTMLPurifier_Length
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*/
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public function validate($number, $config, $context)
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{
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$number = $this->parseCDATA($number);
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if ($number === '') {
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return false;
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}
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if ($number === '0') {
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return '0';
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}
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$sign = '';
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switch ($number[0]) {
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case '-':
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if ($this->non_negative) {
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return false;
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}
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$sign = '-';
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case '+':
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$number = substr($number, 1);
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}
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if (ctype_digit($number)) {
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$number = ltrim($number, '0');
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return $number ? $sign . $number : '0';
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}
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// Period is the only non-numeric character allowed
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if (strpos($number, '.') === false) {
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return false;
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}
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list($left, $right) = explode('.', $number, 2);
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if ($left === '' && $right === '') {
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return false;
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}
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if ($left !== '' && !ctype_digit($left)) {
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return false;
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}
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// Remove leading zeros until positive number or a zero stays left
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if (ltrim($left, '0') != '') {
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$left = ltrim($left, '0');
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} else {
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$left = '0';
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}
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$right = rtrim($right, '0');
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if ($right === '') {
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return $left ? $sign . $left : '0';
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} elseif (!ctype_digit($right)) {
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return false;
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}
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return $sign . $left . '.' . $right;
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}
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}
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// vim: et sw=4 sts=4
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