95 lines
2.4 KiB
PHP
95 lines
2.4 KiB
PHP
<?php
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declare(strict_types = 1);
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namespace HtmlParser;
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use Exception;
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use DOMNode;
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use DOMDocument;
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use DOMDocumentFragment;
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use SimpleXMLElement;
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use DOMXPath;
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class Parser
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{
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public static function stringify(DOMNode $node): string
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{
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if ($node instanceof DOMDocument) {
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return $node->saveHTML($node);
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}
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return $node->ownerDocument->saveHTML($node);
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}
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public static function parse(string $html, ?string $encoding = null): DOMDocument
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{
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$detected = $encoding ?? mb_detect_encoding($html);
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if ($detected) {
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$html = mb_encode_numericentity($html, [0x80, 0xFFFFFF, 0, -1], $detected);
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}
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$document = self::createDOMDocument($html);
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$xpath = new DOMXPath($document);
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$charset = $xpath->query('.//meta[@charset]')->item(0);
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$httpEquiv = $xpath->query('.//meta[@http-equiv]')->item(0);
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if ($charset || $httpEquiv) {
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$charset = $charset ? self::stringify($charset) : null;
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$httpEquiv = $httpEquiv ? self::stringify($httpEquiv) : null;
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$html = preg_replace(
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'/<head[^>]*>/',
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'<head>'.$charset.$httpEquiv,
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$html
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);
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return self::createDOMDocument($html);
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}
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return $document;
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}
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public static function parseFragment(string $html, ?string $encoding = null): DOMDocumentFragment
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{
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$html = "<html><head></head><body>{$html}</body></html>";
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$document = static::parse($html, $encoding);
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$fragment = $document->createDocumentFragment();
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$body = $document->getElementsByTagName('body')->item(0);
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$nodes = [];
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foreach ($body->childNodes as $node) {
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$nodes[] = $node;
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}
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foreach ($nodes as $node) {
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$fragment->appendChild($node);
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}
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return $fragment;
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}
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private static function createDOMDocument(string $code): DOMDocument
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{
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$errors = libxml_use_internal_errors(true);
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// Enabled by default in PHP 8
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if (PHP_MAJOR_VERSION < 8) {
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$entities = libxml_disable_entity_loader(true);
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}
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$document = new DOMDocument();
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$document->loadHTML($code);
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libxml_use_internal_errors($errors);
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if (PHP_MAJOR_VERSION < 8) {
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libxml_disable_entity_loader($entities);
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}
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return $document;
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}
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}
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