mirror of
https://github.com/renbaoshuo/S2OJ.git
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96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
85 lines
2.1 KiB
PHP
85 lines
2.1 KiB
PHP
<?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($left)) {
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return false;
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}
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$left = ltrim($left, '0');
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$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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