2022-08-16 20:23:53 +08:00
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<?php
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2022-08-17 21:39:53 +08:00
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namespace BookStack\References;
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2022-08-16 20:23:53 +08:00
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use BookStack\Model;
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2022-08-17 21:39:53 +08:00
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use BookStack\References\ModelResolvers\BookLinkModelResolver;
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use BookStack\References\ModelResolvers\BookshelfLinkModelResolver;
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use BookStack\References\ModelResolvers\ChapterLinkModelResolver;
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use BookStack\References\ModelResolvers\CrossLinkModelResolver;
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use BookStack\References\ModelResolvers\PageLinkModelResolver;
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use BookStack\References\ModelResolvers\PagePermalinkModelResolver;
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2022-08-16 20:23:53 +08:00
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use DOMDocument;
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use DOMXPath;
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class CrossLinkParser
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{
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/**
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* @var CrossLinkModelResolver[]
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*/
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protected array $modelResolvers;
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public function __construct(array $modelResolvers)
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{
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$this->modelResolvers = $modelResolvers;
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}
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/**
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* Extract any found models within the given HTML content.
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*
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* @return Model[]
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*/
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public function extractLinkedModels(string $html): array
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{
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$models = [];
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$links = $this->getLinksFromContent($html);
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foreach ($links as $link) {
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$model = $this->linkToModel($link);
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if (!is_null($model)) {
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$models[get_class($model) . ':' . $model->id] = $model;
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}
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}
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return array_values($models);
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}
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/**
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* Get a list of href values from the given document.
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*
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* @returns string[]
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*/
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protected function getLinksFromContent(string $html): array
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{
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$links = [];
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$html = '<body>' . $html . '</body>';
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libxml_use_internal_errors(true);
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$doc = new DOMDocument();
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$doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
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$xPath = new DOMXPath($doc);
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$anchors = $xPath->query('//a[@href]');
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/** @var \DOMElement $anchor */
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foreach ($anchors as $anchor) {
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$links[] = $anchor->getAttribute('href');
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}
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return $links;
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}
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/**
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* Attempt to resolve the given link to a model using the instance model resolvers.
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*/
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protected function linkToModel(string $link): ?Model
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{
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foreach ($this->modelResolvers as $resolver) {
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$model = $resolver->resolve($link);
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if (!is_null($model)) {
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return $model;
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}
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}
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return null;
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}
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/**
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* Create a new instance with a pre-defined set of model resolvers, specifically for the
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* default set of entities within BookStack.
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*/
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public static function createWithEntityResolvers(): self
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{
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return new static([
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new PagePermalinkModelResolver(),
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new PageLinkModelResolver(),
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new ChapterLinkModelResolver(),
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new BookLinkModelResolver(),
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new BookshelfLinkModelResolver(),
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]);
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}
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}
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