156 lines
3.7 KiB
PHP
156 lines
3.7 KiB
PHP
<?php
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namespace PicoFeed\Filter;
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/**
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* Filter class.
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*
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* @author Frederic Guillot
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*/
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class Filter
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{
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/**
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* Get the Html filter instance.
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*
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* @static
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*
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* @param string $html HTML content
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* @param string $website Site URL (used to build absolute URL)
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*
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* @return Html
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*/
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public static function html($html, $website)
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{
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$filter = new Html($html, $website);
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return $filter;
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}
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/**
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* Escape HTML content.
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*
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* @static
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*
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* @return string
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*/
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public static function escape($content)
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{
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return htmlspecialchars($content, ENT_QUOTES, 'UTF-8', false);
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}
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/**
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* Remove HTML tags.
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*
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* @param string $data Input data
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*
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* @return string
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*/
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public function removeHTMLTags($data)
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{
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return preg_replace('~<(?:!DOCTYPE|/?(?:html|head|body))[^>]*>\s*~i', '', $data);
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}
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/**
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* Remove the XML tag from a document.
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*
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* @static
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*
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* @param string $data Input data
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*
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* @return string
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*/
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public static function stripXmlTag($data)
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{
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if (strpos($data, '<?xml') !== false) {
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$data = ltrim(substr($data, strpos($data, '?>') + 2));
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}
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do {
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$pos = strpos($data, '<?xml-stylesheet ');
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if ($pos !== false) {
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$data = ltrim(substr($data, strpos($data, '?>') + 2));
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}
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} while ($pos !== false && $pos < 200);
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return $data;
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}
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/**
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* Strip head tag from the HTML content.
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*
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* @static
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*
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* @param string $data Input data
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*
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* @return string
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*/
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public static function stripHeadTags($data)
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{
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return preg_replace('@<head[^>]*?>.*?</head>@siu', '', $data);
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}
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/**
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* Trim whitespace from the begining, the end and inside a string and don't break utf-8 string.
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*
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* @static
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*
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* @param string $value Raw data
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*
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* @return string Normalized data
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*/
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public static function stripWhiteSpace($value)
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{
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$value = str_replace("\r", ' ', $value);
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$value = str_replace("\t", ' ', $value);
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$value = str_replace("\n", ' ', $value);
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// $value = preg_replace('/\s+/', ' ', $value); <= break utf-8
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return trim($value);
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}
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/**
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* Fixes before XML parsing.
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*
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* @static
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*
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* @param string $data Raw data
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*
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* @return string Normalized data
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*/
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public static function normalizeData($data)
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{
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$entities = array(
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'/(&#)(\d+);/m', // decimal encoded
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'/(&#x)([a-f0-9]+);/mi', // hex encoded
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);
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// strip invalid XML 1.0 characters which are encoded as entities
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$data = preg_replace_callback($entities, function ($matches) {
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$code_point = $matches[2];
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// convert hex entity to decimal
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if (strtolower($matches[1]) === '&#x') {
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$code_point = hexdec($code_point);
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}
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$code_point = (int) $code_point;
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// replace invalid characters
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if ($code_point < 9
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|| ($code_point > 10 && $code_point < 13)
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|| ($code_point > 13 && $code_point < 32)
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|| ($code_point > 55295 && $code_point < 57344)
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|| ($code_point > 65533 && $code_point < 65536)
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|| $code_point > 1114111
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) {
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return '';
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};
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return $matches[0];
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}, $data);
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// strip every utf-8 character than isn't in the range of valid XML 1.0 characters
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return (string) preg_replace('/[^\x{0009}\x{000A}\x{000D}\x{0020}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}]/u', '', $data);
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}
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}
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