1204 lines
37 KiB
PHP
1204 lines
37 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\DomCrawler;
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use Masterminds\HTML5;
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use Symfony\Component\CssSelector\CssSelectorConverter;
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/**
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* Crawler eases navigation of a list of \DOMNode objects.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*
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* @implements \IteratorAggregate<int, \DOMNode>
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*/
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class Crawler implements \Countable, \IteratorAggregate
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{
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/**
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* @var string|null
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*/
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protected $uri;
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/**
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* The default namespace prefix to be used with XPath and CSS expressions.
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*/
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private string $defaultNamespacePrefix = 'default';
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/**
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* A map of manually registered namespaces.
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*
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* @var array<string, string>
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*/
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private array $namespaces = [];
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/**
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* A map of cached namespaces.
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*/
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private \ArrayObject $cachedNamespaces;
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private ?string $baseHref;
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private ?\DOMDocument $document = null;
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/**
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* @var list<\DOMNode>
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*/
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private array $nodes = [];
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/**
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* Whether the Crawler contains HTML or XML content (used when converting CSS to XPath).
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*/
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private bool $isHtml = true;
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private $html5Parser;
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/**
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* @param \DOMNodeList|\DOMNode|\DOMNode[]|string|null $node A Node to use as the base for the crawling
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*/
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public function __construct(\DOMNodeList|\DOMNode|array|string $node = null, string $uri = null, string $baseHref = null)
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{
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$this->uri = $uri;
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$this->baseHref = $baseHref ?: $uri;
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$this->html5Parser = class_exists(HTML5::class) ? new HTML5(['disable_html_ns' => true]) : null;
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$this->cachedNamespaces = new \ArrayObject();
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$this->add($node);
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}
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/**
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* Returns the current URI.
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*/
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public function getUri(): ?string
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{
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return $this->uri;
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}
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/**
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* Returns base href.
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*/
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public function getBaseHref(): ?string
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{
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return $this->baseHref;
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}
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/**
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* Removes all the nodes.
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*/
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public function clear()
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{
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$this->nodes = [];
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$this->document = null;
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$this->cachedNamespaces = new \ArrayObject();
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}
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/**
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* Adds a node to the current list of nodes.
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*
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* This method uses the appropriate specialized add*() method based
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* on the type of the argument.
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*
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* @param \DOMNodeList|\DOMNode|\DOMNode[]|string|null $node A node
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*
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* @throws \InvalidArgumentException when node is not the expected type
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*/
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public function add(\DOMNodeList|\DOMNode|array|string|null $node)
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{
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if ($node instanceof \DOMNodeList) {
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$this->addNodeList($node);
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} elseif ($node instanceof \DOMNode) {
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$this->addNode($node);
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} elseif (\is_array($node)) {
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$this->addNodes($node);
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} elseif (\is_string($node)) {
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$this->addContent($node);
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} elseif (null !== $node) {
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throw new \InvalidArgumentException(sprintf('Expecting a DOMNodeList or DOMNode instance, an array, a string, or null, but got "%s".', get_debug_type($node)));
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}
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}
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/**
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* Adds HTML/XML content.
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*
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* If the charset is not set via the content type, it is assumed to be UTF-8,
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* or ISO-8859-1 as a fallback, which is the default charset defined by the
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* HTTP 1.1 specification.
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*/
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public function addContent(string $content, string $type = null)
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{
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if (empty($type)) {
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$type = str_starts_with($content, '<?xml') ? 'application/xml' : 'text/html';
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}
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// DOM only for HTML/XML content
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if (!preg_match('/(x|ht)ml/i', $type, $xmlMatches)) {
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return;
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}
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$charset = null;
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if (false !== $pos = stripos($type, 'charset=')) {
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$charset = substr($type, $pos + 8);
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if (false !== $pos = strpos($charset, ';')) {
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$charset = substr($charset, 0, $pos);
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}
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}
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// http://www.w3.org/TR/encoding/#encodings
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// http://www.w3.org/TR/REC-xml/#NT-EncName
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if (null === $charset &&
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preg_match('/\<meta[^\>]+charset *= *["\']?([a-zA-Z\-0-9_:.]+)/i', $content, $matches)) {
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$charset = $matches[1];
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}
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if (null === $charset) {
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$charset = preg_match('//u', $content) ? 'UTF-8' : 'ISO-8859-1';
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}
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if ('x' === $xmlMatches[1]) {
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$this->addXmlContent($content, $charset);
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} else {
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$this->addHtmlContent($content, $charset);
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}
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}
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/**
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* Adds an HTML content to the list of nodes.
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*
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* The libxml errors are disabled when the content is parsed.
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*
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* If you want to get parsing errors, be sure to enable
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* internal errors via libxml_use_internal_errors(true)
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* and then, get the errors via libxml_get_errors(). Be
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* sure to clear errors with libxml_clear_errors() afterward.
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*/
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public function addHtmlContent(string $content, string $charset = 'UTF-8')
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{
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$dom = $this->parseHtmlString($content, $charset);
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$this->addDocument($dom);
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$base = $this->filterRelativeXPath('descendant-or-self::base')->extract(['href']);
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$baseHref = current($base);
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if (\count($base) && !empty($baseHref)) {
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if ($this->baseHref) {
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$linkNode = $dom->createElement('a');
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$linkNode->setAttribute('href', $baseHref);
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$link = new Link($linkNode, $this->baseHref);
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$this->baseHref = $link->getUri();
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} else {
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$this->baseHref = $baseHref;
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}
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}
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}
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/**
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* Adds an XML content to the list of nodes.
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*
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* The libxml errors are disabled when the content is parsed.
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*
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* If you want to get parsing errors, be sure to enable
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* internal errors via libxml_use_internal_errors(true)
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* and then, get the errors via libxml_get_errors(). Be
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* sure to clear errors with libxml_clear_errors() afterward.
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*
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* @param int $options Bitwise OR of the libxml option constants
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* LIBXML_PARSEHUGE is dangerous, see
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* http://symfony.com/blog/security-release-symfony-2-0-17-released
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*/
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public function addXmlContent(string $content, string $charset = 'UTF-8', int $options = \LIBXML_NONET)
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{
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// remove the default namespace if it's the only namespace to make XPath expressions simpler
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if (!preg_match('/xmlns:/', $content)) {
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$content = str_replace('xmlns', 'ns', $content);
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}
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$internalErrors = libxml_use_internal_errors(true);
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$dom = new \DOMDocument('1.0', $charset);
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$dom->validateOnParse = true;
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if ('' !== trim($content)) {
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@$dom->loadXML($content, $options);
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}
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libxml_use_internal_errors($internalErrors);
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$this->addDocument($dom);
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$this->isHtml = false;
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}
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/**
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* Adds a \DOMDocument to the list of nodes.
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*
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* @param \DOMDocument $dom A \DOMDocument instance
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*/
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public function addDocument(\DOMDocument $dom)
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{
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if ($dom->documentElement) {
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$this->addNode($dom->documentElement);
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}
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}
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/**
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* Adds a \DOMNodeList to the list of nodes.
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*
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* @param \DOMNodeList $nodes A \DOMNodeList instance
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*/
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public function addNodeList(\DOMNodeList $nodes)
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{
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foreach ($nodes as $node) {
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if ($node instanceof \DOMNode) {
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$this->addNode($node);
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}
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}
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}
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/**
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* Adds an array of \DOMNode instances to the list of nodes.
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*
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* @param \DOMNode[] $nodes An array of \DOMNode instances
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*/
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public function addNodes(array $nodes)
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{
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foreach ($nodes as $node) {
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$this->add($node);
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}
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}
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/**
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* Adds a \DOMNode instance to the list of nodes.
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*
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* @param \DOMNode $node A \DOMNode instance
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*/
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public function addNode(\DOMNode $node)
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{
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if ($node instanceof \DOMDocument) {
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$node = $node->documentElement;
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}
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if (null !== $this->document && $this->document !== $node->ownerDocument) {
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throw new \InvalidArgumentException('Attaching DOM nodes from multiple documents in the same crawler is forbidden.');
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}
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if (null === $this->document) {
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$this->document = $node->ownerDocument;
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}
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// Don't add duplicate nodes in the Crawler
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if (\in_array($node, $this->nodes, true)) {
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return;
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}
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$this->nodes[] = $node;
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}
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/**
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* Returns a node given its position in the node list.
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*/
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public function eq(int $position): static
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{
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if (isset($this->nodes[$position])) {
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return $this->createSubCrawler($this->nodes[$position]);
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}
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return $this->createSubCrawler(null);
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}
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/**
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* Calls an anonymous function on each node of the list.
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*
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* The anonymous function receives the position and the node wrapped
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* in a Crawler instance as arguments.
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*
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* Example:
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*
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* $crawler->filter('h1')->each(function ($node, $i) {
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* return $node->text();
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* });
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*
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* @param \Closure $closure An anonymous function
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*
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* @return array An array of values returned by the anonymous function
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*/
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public function each(\Closure $closure): array
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{
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$data = [];
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foreach ($this->nodes as $i => $node) {
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$data[] = $closure($this->createSubCrawler($node), $i);
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}
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return $data;
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}
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/**
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* Slices the list of nodes by $offset and $length.
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*/
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public function slice(int $offset = 0, int $length = null): static
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{
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return $this->createSubCrawler(\array_slice($this->nodes, $offset, $length));
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}
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/**
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* Reduces the list of nodes by calling an anonymous function.
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*
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* To remove a node from the list, the anonymous function must return false.
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*
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* @param \Closure $closure An anonymous function
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*/
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public function reduce(\Closure $closure): static
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{
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$nodes = [];
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foreach ($this->nodes as $i => $node) {
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if (false !== $closure($this->createSubCrawler($node), $i)) {
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$nodes[] = $node;
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}
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}
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return $this->createSubCrawler($nodes);
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}
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/**
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* Returns the first node of the current selection.
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*/
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public function first(): static
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{
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return $this->eq(0);
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}
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/**
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* Returns the last node of the current selection.
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*/
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public function last(): static
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{
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return $this->eq(\count($this->nodes) - 1);
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}
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/**
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* Returns the siblings nodes of the current selection.
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*
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* @throws \InvalidArgumentException When current node is empty
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*/
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public function siblings(): static
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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return $this->createSubCrawler($this->sibling($this->getNode(0)->parentNode->firstChild));
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}
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public function matches(string $selector): bool
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{
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if (!$this->nodes) {
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return false;
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}
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$converter = $this->createCssSelectorConverter();
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$xpath = $converter->toXPath($selector, 'self::');
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return 0 !== $this->filterRelativeXPath($xpath)->count();
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}
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/**
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* Return first parents (heading toward the document root) of the Element that matches the provided selector.
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*
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* @see https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
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*
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* @throws \InvalidArgumentException When current node is empty
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*/
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public function closest(string $selector): ?self
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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$domNode = $this->getNode(0);
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while (\XML_ELEMENT_NODE === $domNode->nodeType) {
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$node = $this->createSubCrawler($domNode);
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if ($node->matches($selector)) {
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return $node;
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}
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$domNode = $node->getNode(0)->parentNode;
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}
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return null;
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}
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/**
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* Returns the next siblings nodes of the current selection.
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*
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* @throws \InvalidArgumentException When current node is empty
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*/
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public function nextAll(): static
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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return $this->createSubCrawler($this->sibling($this->getNode(0)));
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}
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/**
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* Returns the previous sibling nodes of the current selection.
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*
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* @throws \InvalidArgumentException
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*/
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public function previousAll(): static
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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return $this->createSubCrawler($this->sibling($this->getNode(0), 'previousSibling'));
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}
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/**
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* Returns the ancestors of the current selection.
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*
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* @throws \InvalidArgumentException When the current node is empty
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*/
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public function ancestors(): static
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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$node = $this->getNode(0);
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$nodes = [];
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while ($node = $node->parentNode) {
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if (\XML_ELEMENT_NODE === $node->nodeType) {
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$nodes[] = $node;
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}
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}
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return $this->createSubCrawler($nodes);
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}
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/**
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* Returns the children nodes of the current selection.
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*
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* @throws \InvalidArgumentException When current node is empty
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* @throws \RuntimeException If the CssSelector Component is not available and $selector is provided
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*/
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public function children(string $selector = null): static
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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if (null !== $selector) {
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$converter = $this->createCssSelectorConverter();
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$xpath = $converter->toXPath($selector, 'child::');
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return $this->filterRelativeXPath($xpath);
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}
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$node = $this->getNode(0)->firstChild;
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return $this->createSubCrawler($node ? $this->sibling($node) : []);
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}
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/**
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* Returns the attribute value of the first node of the list.
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*
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* @throws \InvalidArgumentException When current node is empty
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*/
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public function attr(string $attribute): ?string
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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$node = $this->getNode(0);
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return $node->hasAttribute($attribute) ? $node->getAttribute($attribute) : null;
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}
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/**
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* Returns the node name of the first node of the list.
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*
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* @throws \InvalidArgumentException When current node is empty
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*/
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public function nodeName(): string
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{
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if (!$this->nodes) {
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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return $this->getNode(0)->nodeName;
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}
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/**
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* Returns the text of the first node of the list.
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*
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* Pass true as the second argument to normalize whitespaces.
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*
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* @param string|null $default When not null: the value to return when the current node is empty
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* @param bool $normalizeWhitespace Whether whitespaces should be trimmed and normalized to single spaces
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*
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* @throws \InvalidArgumentException When current node is empty
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*/
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public function text(string $default = null, bool $normalizeWhitespace = true): string
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{
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if (!$this->nodes) {
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if (null !== $default) {
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return $default;
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}
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throw new \InvalidArgumentException('The current node list is empty.');
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}
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$text = $this->getNode(0)->nodeValue;
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if ($normalizeWhitespace) {
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return trim(preg_replace('/(?:\s{2,}+|[^\S ])/', ' ', $text));
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}
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return $text;
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}
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/**
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* Returns only the inner text that is the direct descendent of the current node, excluding any child nodes.
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*/
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public function innerText(): string
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{
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return $this->filterXPath('.//text()')->text();
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}
|
|
|
|
/**
|
|
* Returns the first node of the list as HTML.
|
|
*
|
|
* @param string|null $default When not null: the value to return when the current node is empty
|
|
*
|
|
* @throws \InvalidArgumentException When current node is empty
|
|
*/
|
|
public function html(string $default = null): string
|
|
{
|
|
if (!$this->nodes) {
|
|
if (null !== $default) {
|
|
return $default;
|
|
}
|
|
|
|
throw new \InvalidArgumentException('The current node list is empty.');
|
|
}
|
|
|
|
$node = $this->getNode(0);
|
|
$owner = $node->ownerDocument;
|
|
|
|
if (null !== $this->html5Parser && '<!DOCTYPE html>' === $owner->saveXML($owner->childNodes[0])) {
|
|
$owner = $this->html5Parser;
|
|
}
|
|
|
|
$html = '';
|
|
foreach ($node->childNodes as $child) {
|
|
$html .= $owner->saveHTML($child);
|
|
}
|
|
|
|
return $html;
|
|
}
|
|
|
|
public function outerHtml(): string
|
|
{
|
|
if (!\count($this)) {
|
|
throw new \InvalidArgumentException('The current node list is empty.');
|
|
}
|
|
|
|
$node = $this->getNode(0);
|
|
$owner = $node->ownerDocument;
|
|
|
|
if (null !== $this->html5Parser && '<!DOCTYPE html>' === $owner->saveXML($owner->childNodes[0])) {
|
|
$owner = $this->html5Parser;
|
|
}
|
|
|
|
return $owner->saveHTML($node);
|
|
}
|
|
|
|
/**
|
|
* Evaluates an XPath expression.
|
|
*
|
|
* Since an XPath expression might evaluate to either a simple type or a \DOMNodeList,
|
|
* this method will return either an array of simple types or a new Crawler instance.
|
|
*/
|
|
public function evaluate(string $xpath): array|Crawler
|
|
{
|
|
if (null === $this->document) {
|
|
throw new \LogicException('Cannot evaluate the expression on an uninitialized crawler.');
|
|
}
|
|
|
|
$data = [];
|
|
$domxpath = $this->createDOMXPath($this->document, $this->findNamespacePrefixes($xpath));
|
|
|
|
foreach ($this->nodes as $node) {
|
|
$data[] = $domxpath->evaluate($xpath, $node);
|
|
}
|
|
|
|
if (isset($data[0]) && $data[0] instanceof \DOMNodeList) {
|
|
return $this->createSubCrawler($data);
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Extracts information from the list of nodes.
|
|
*
|
|
* You can extract attributes or/and the node value (_text).
|
|
*
|
|
* Example:
|
|
*
|
|
* $crawler->filter('h1 a')->extract(['_text', 'href']);
|
|
*/
|
|
public function extract(array $attributes): array
|
|
{
|
|
$count = \count($attributes);
|
|
|
|
$data = [];
|
|
foreach ($this->nodes as $node) {
|
|
$elements = [];
|
|
foreach ($attributes as $attribute) {
|
|
if ('_text' === $attribute) {
|
|
$elements[] = $node->nodeValue;
|
|
} elseif ('_name' === $attribute) {
|
|
$elements[] = $node->nodeName;
|
|
} else {
|
|
$elements[] = $node->getAttribute($attribute);
|
|
}
|
|
}
|
|
|
|
$data[] = 1 === $count ? $elements[0] : $elements;
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Filters the list of nodes with an XPath expression.
|
|
*
|
|
* The XPath expression is evaluated in the context of the crawler, which
|
|
* is considered as a fake parent of the elements inside it.
|
|
* This means that a child selector "div" or "./div" will match only
|
|
* the div elements of the current crawler, not their children.
|
|
*/
|
|
public function filterXPath(string $xpath): static
|
|
{
|
|
$xpath = $this->relativize($xpath);
|
|
|
|
// If we dropped all expressions in the XPath while preparing it, there would be no match
|
|
if ('' === $xpath) {
|
|
return $this->createSubCrawler(null);
|
|
}
|
|
|
|
return $this->filterRelativeXPath($xpath);
|
|
}
|
|
|
|
/**
|
|
* Filters the list of nodes with a CSS selector.
|
|
*
|
|
* This method only works if you have installed the CssSelector Symfony Component.
|
|
*
|
|
* @throws \RuntimeException if the CssSelector Component is not available
|
|
*/
|
|
public function filter(string $selector): static
|
|
{
|
|
$converter = $this->createCssSelectorConverter();
|
|
|
|
// The CssSelector already prefixes the selector with descendant-or-self::
|
|
return $this->filterRelativeXPath($converter->toXPath($selector));
|
|
}
|
|
|
|
/**
|
|
* Selects links by name or alt value for clickable images.
|
|
*/
|
|
public function selectLink(string $value): static
|
|
{
|
|
return $this->filterRelativeXPath(
|
|
sprintf('descendant-or-self::a[contains(concat(\' \', normalize-space(string(.)), \' \'), %1$s) or ./img[contains(concat(\' \', normalize-space(string(@alt)), \' \'), %1$s)]]', static::xpathLiteral(' '.$value.' '))
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Selects images by alt value.
|
|
*/
|
|
public function selectImage(string $value): static
|
|
{
|
|
$xpath = sprintf('descendant-or-self::img[contains(normalize-space(string(@alt)), %s)]', static::xpathLiteral($value));
|
|
|
|
return $this->filterRelativeXPath($xpath);
|
|
}
|
|
|
|
/**
|
|
* Selects a button by name or alt value for images.
|
|
*/
|
|
public function selectButton(string $value): static
|
|
{
|
|
return $this->filterRelativeXPath(
|
|
sprintf('descendant-or-self::input[((contains(%1$s, "submit") or contains(%1$s, "button")) and contains(concat(\' \', normalize-space(string(@value)), \' \'), %2$s)) or (contains(%1$s, "image") and contains(concat(\' \', normalize-space(string(@alt)), \' \'), %2$s)) or @id=%3$s or @name=%3$s] | descendant-or-self::button[contains(concat(\' \', normalize-space(string(.)), \' \'), %2$s) or @id=%3$s or @name=%3$s]', 'translate(@type, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz")', static::xpathLiteral(' '.$value.' '), static::xpathLiteral($value))
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Returns a Link object for the first node in the list.
|
|
*
|
|
* @throws \InvalidArgumentException If the current node list is empty or the selected node is not instance of DOMElement
|
|
*/
|
|
public function link(string $method = 'get'): Link
|
|
{
|
|
if (!$this->nodes) {
|
|
throw new \InvalidArgumentException('The current node list is empty.');
|
|
}
|
|
|
|
$node = $this->getNode(0);
|
|
|
|
if (!$node instanceof \DOMElement) {
|
|
throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', get_debug_type($node)));
|
|
}
|
|
|
|
return new Link($node, $this->baseHref, $method);
|
|
}
|
|
|
|
/**
|
|
* Returns an array of Link objects for the nodes in the list.
|
|
*
|
|
* @return Link[]
|
|
*
|
|
* @throws \InvalidArgumentException If the current node list contains non-DOMElement instances
|
|
*/
|
|
public function links(): array
|
|
{
|
|
$links = [];
|
|
foreach ($this->nodes as $node) {
|
|
if (!$node instanceof \DOMElement) {
|
|
throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', get_debug_type($node)));
|
|
}
|
|
|
|
$links[] = new Link($node, $this->baseHref, 'get');
|
|
}
|
|
|
|
return $links;
|
|
}
|
|
|
|
/**
|
|
* Returns an Image object for the first node in the list.
|
|
*
|
|
* @throws \InvalidArgumentException If the current node list is empty
|
|
*/
|
|
public function image(): Image
|
|
{
|
|
if (!\count($this)) {
|
|
throw new \InvalidArgumentException('The current node list is empty.');
|
|
}
|
|
|
|
$node = $this->getNode(0);
|
|
|
|
if (!$node instanceof \DOMElement) {
|
|
throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', get_debug_type($node)));
|
|
}
|
|
|
|
return new Image($node, $this->baseHref);
|
|
}
|
|
|
|
/**
|
|
* Returns an array of Image objects for the nodes in the list.
|
|
*
|
|
* @return Image[]
|
|
*/
|
|
public function images(): array
|
|
{
|
|
$images = [];
|
|
foreach ($this as $node) {
|
|
if (!$node instanceof \DOMElement) {
|
|
throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', get_debug_type($node)));
|
|
}
|
|
|
|
$images[] = new Image($node, $this->baseHref);
|
|
}
|
|
|
|
return $images;
|
|
}
|
|
|
|
/**
|
|
* Returns a Form object for the first node in the list.
|
|
*
|
|
* @throws \InvalidArgumentException If the current node list is empty or the selected node is not instance of DOMElement
|
|
*/
|
|
public function form(array $values = null, string $method = null): Form
|
|
{
|
|
if (!$this->nodes) {
|
|
throw new \InvalidArgumentException('The current node list is empty.');
|
|
}
|
|
|
|
$node = $this->getNode(0);
|
|
|
|
if (!$node instanceof \DOMElement) {
|
|
throw new \InvalidArgumentException(sprintf('The selected node should be instance of DOMElement, got "%s".', get_debug_type($node)));
|
|
}
|
|
|
|
$form = new Form($node, $this->uri, $method, $this->baseHref);
|
|
|
|
if (null !== $values) {
|
|
$form->setValues($values);
|
|
}
|
|
|
|
return $form;
|
|
}
|
|
|
|
/**
|
|
* Overloads a default namespace prefix to be used with XPath and CSS expressions.
|
|
*/
|
|
public function setDefaultNamespacePrefix(string $prefix)
|
|
{
|
|
$this->defaultNamespacePrefix = $prefix;
|
|
}
|
|
|
|
public function registerNamespace(string $prefix, string $namespace)
|
|
{
|
|
$this->namespaces[$prefix] = $namespace;
|
|
}
|
|
|
|
/**
|
|
* Converts string for XPath expressions.
|
|
*
|
|
* Escaped characters are: quotes (") and apostrophe (').
|
|
*
|
|
* Examples:
|
|
*
|
|
* echo Crawler::xpathLiteral('foo " bar');
|
|
* //prints 'foo " bar'
|
|
*
|
|
* echo Crawler::xpathLiteral("foo ' bar");
|
|
* //prints "foo ' bar"
|
|
*
|
|
* echo Crawler::xpathLiteral('a\'b"c');
|
|
* //prints concat('a', "'", 'b"c')
|
|
*/
|
|
public static function xpathLiteral(string $s): string
|
|
{
|
|
if (!str_contains($s, "'")) {
|
|
return sprintf("'%s'", $s);
|
|
}
|
|
|
|
if (!str_contains($s, '"')) {
|
|
return sprintf('"%s"', $s);
|
|
}
|
|
|
|
$string = $s;
|
|
$parts = [];
|
|
while (true) {
|
|
if (false !== $pos = strpos($string, "'")) {
|
|
$parts[] = sprintf("'%s'", substr($string, 0, $pos));
|
|
$parts[] = "\"'\"";
|
|
$string = substr($string, $pos + 1);
|
|
} else {
|
|
$parts[] = "'$string'";
|
|
break;
|
|
}
|
|
}
|
|
|
|
return sprintf('concat(%s)', implode(', ', $parts));
|
|
}
|
|
|
|
/**
|
|
* Filters the list of nodes with an XPath expression.
|
|
*
|
|
* The XPath expression should already be processed to apply it in the context of each node.
|
|
*/
|
|
private function filterRelativeXPath(string $xpath): static
|
|
{
|
|
$crawler = $this->createSubCrawler(null);
|
|
if (null === $this->document) {
|
|
return $crawler;
|
|
}
|
|
|
|
$domxpath = $this->createDOMXPath($this->document, $this->findNamespacePrefixes($xpath));
|
|
|
|
foreach ($this->nodes as $node) {
|
|
$crawler->add($domxpath->query($xpath, $node));
|
|
}
|
|
|
|
return $crawler;
|
|
}
|
|
|
|
/**
|
|
* Make the XPath relative to the current context.
|
|
*
|
|
* The returned XPath will match elements matching the XPath inside the current crawler
|
|
* when running in the context of a node of the crawler.
|
|
*/
|
|
private function relativize(string $xpath): string
|
|
{
|
|
$expressions = [];
|
|
|
|
// An expression which will never match to replace expressions which cannot match in the crawler
|
|
// We cannot drop
|
|
$nonMatchingExpression = 'a[name() = "b"]';
|
|
|
|
$xpathLen = \strlen($xpath);
|
|
$openedBrackets = 0;
|
|
$startPosition = strspn($xpath, " \t\n\r\0\x0B");
|
|
|
|
for ($i = $startPosition; $i <= $xpathLen; ++$i) {
|
|
$i += strcspn($xpath, '"\'[]|', $i);
|
|
|
|
if ($i < $xpathLen) {
|
|
switch ($xpath[$i]) {
|
|
case '"':
|
|
case "'":
|
|
if (false === $i = strpos($xpath, $xpath[$i], $i + 1)) {
|
|
return $xpath; // The XPath expression is invalid
|
|
}
|
|
continue 2;
|
|
case '[':
|
|
++$openedBrackets;
|
|
continue 2;
|
|
case ']':
|
|
--$openedBrackets;
|
|
continue 2;
|
|
}
|
|
}
|
|
if ($openedBrackets) {
|
|
continue;
|
|
}
|
|
|
|
if ($startPosition < $xpathLen && '(' === $xpath[$startPosition]) {
|
|
// If the union is inside some braces, we need to preserve the opening braces and apply
|
|
// the change only inside it.
|
|
$j = 1 + strspn($xpath, "( \t\n\r\0\x0B", $startPosition + 1);
|
|
$parenthesis = substr($xpath, $startPosition, $j);
|
|
$startPosition += $j;
|
|
} else {
|
|
$parenthesis = '';
|
|
}
|
|
$expression = rtrim(substr($xpath, $startPosition, $i - $startPosition));
|
|
|
|
if (str_starts_with($expression, 'self::*/')) {
|
|
$expression = './'.substr($expression, 8);
|
|
}
|
|
|
|
// add prefix before absolute element selector
|
|
if ('' === $expression) {
|
|
$expression = $nonMatchingExpression;
|
|
} elseif (str_starts_with($expression, '//')) {
|
|
$expression = 'descendant-or-self::'.substr($expression, 2);
|
|
} elseif (str_starts_with($expression, './/')) {
|
|
$expression = 'descendant-or-self::'.substr($expression, 3);
|
|
} elseif (str_starts_with($expression, './')) {
|
|
$expression = 'self::'.substr($expression, 2);
|
|
} elseif (str_starts_with($expression, 'child::')) {
|
|
$expression = 'self::'.substr($expression, 7);
|
|
} elseif ('/' === $expression[0] || '.' === $expression[0] || str_starts_with($expression, 'self::')) {
|
|
$expression = $nonMatchingExpression;
|
|
} elseif (str_starts_with($expression, 'descendant::')) {
|
|
$expression = 'descendant-or-self::'.substr($expression, 12);
|
|
} elseif (preg_match('/^(ancestor|ancestor-or-self|attribute|following|following-sibling|namespace|parent|preceding|preceding-sibling)::/', $expression)) {
|
|
// the fake root has no parent, preceding or following nodes and also no attributes (even no namespace attributes)
|
|
$expression = $nonMatchingExpression;
|
|
} elseif (!str_starts_with($expression, 'descendant-or-self::')) {
|
|
$expression = 'self::'.$expression;
|
|
}
|
|
$expressions[] = $parenthesis.$expression;
|
|
|
|
if ($i === $xpathLen) {
|
|
return implode(' | ', $expressions);
|
|
}
|
|
|
|
$i += strspn($xpath, " \t\n\r\0\x0B", $i + 1);
|
|
$startPosition = $i + 1;
|
|
}
|
|
|
|
return $xpath; // The XPath expression is invalid
|
|
}
|
|
|
|
public function getNode(int $position): ?\DOMNode
|
|
{
|
|
return $this->nodes[$position] ?? null;
|
|
}
|
|
|
|
public function count(): int
|
|
{
|
|
return \count($this->nodes);
|
|
}
|
|
|
|
/**
|
|
* @return \ArrayIterator<int, \DOMNode>
|
|
*/
|
|
public function getIterator(): \ArrayIterator
|
|
{
|
|
return new \ArrayIterator($this->nodes);
|
|
}
|
|
|
|
protected function sibling(\DOMNode $node, string $siblingDir = 'nextSibling'): array
|
|
{
|
|
$nodes = [];
|
|
|
|
$currentNode = $this->getNode(0);
|
|
do {
|
|
if ($node !== $currentNode && \XML_ELEMENT_NODE === $node->nodeType) {
|
|
$nodes[] = $node;
|
|
}
|
|
} while ($node = $node->$siblingDir);
|
|
|
|
return $nodes;
|
|
}
|
|
|
|
private function parseHtml5(string $htmlContent, string $charset = 'UTF-8'): \DOMDocument
|
|
{
|
|
return $this->html5Parser->parse($this->convertToHtmlEntities($htmlContent, $charset));
|
|
}
|
|
|
|
private function parseXhtml(string $htmlContent, string $charset = 'UTF-8'): \DOMDocument
|
|
{
|
|
$htmlContent = $this->convertToHtmlEntities($htmlContent, $charset);
|
|
|
|
$internalErrors = libxml_use_internal_errors(true);
|
|
|
|
$dom = new \DOMDocument('1.0', $charset);
|
|
$dom->validateOnParse = true;
|
|
|
|
if ('' !== trim($htmlContent)) {
|
|
@$dom->loadHTML($htmlContent);
|
|
}
|
|
|
|
libxml_use_internal_errors($internalErrors);
|
|
|
|
return $dom;
|
|
}
|
|
|
|
/**
|
|
* Converts charset to HTML-entities to ensure valid parsing.
|
|
*/
|
|
private function convertToHtmlEntities(string $htmlContent, string $charset = 'UTF-8'): string
|
|
{
|
|
set_error_handler(function () { throw new \Exception(); });
|
|
|
|
try {
|
|
return mb_convert_encoding($htmlContent, 'HTML-ENTITIES', $charset);
|
|
} catch (\Exception|\ValueError $e) {
|
|
try {
|
|
$htmlContent = iconv($charset, 'UTF-8', $htmlContent);
|
|
$htmlContent = mb_convert_encoding($htmlContent, 'HTML-ENTITIES', 'UTF-8');
|
|
} catch (\Exception|\ValueError $e) {
|
|
}
|
|
|
|
return $htmlContent;
|
|
} finally {
|
|
restore_error_handler();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @throws \InvalidArgumentException
|
|
*/
|
|
private function createDOMXPath(\DOMDocument $document, array $prefixes = []): \DOMXPath
|
|
{
|
|
$domxpath = new \DOMXPath($document);
|
|
|
|
foreach ($prefixes as $prefix) {
|
|
$namespace = $this->discoverNamespace($domxpath, $prefix);
|
|
if (null !== $namespace) {
|
|
$domxpath->registerNamespace($prefix, $namespace);
|
|
}
|
|
}
|
|
|
|
return $domxpath;
|
|
}
|
|
|
|
/**
|
|
* @throws \InvalidArgumentException
|
|
*/
|
|
private function discoverNamespace(\DOMXPath $domxpath, string $prefix): ?string
|
|
{
|
|
if (\array_key_exists($prefix, $this->namespaces)) {
|
|
return $this->namespaces[$prefix];
|
|
}
|
|
|
|
if ($this->cachedNamespaces->offsetExists($prefix)) {
|
|
return $this->cachedNamespaces[$prefix];
|
|
}
|
|
|
|
// ask for one namespace, otherwise we'd get a collection with an item for each node
|
|
$namespaces = $domxpath->query(sprintf('(//namespace::*[name()="%s"])[last()]', $this->defaultNamespacePrefix === $prefix ? '' : $prefix));
|
|
|
|
return $this->cachedNamespaces[$prefix] = ($node = $namespaces->item(0)) ? $node->nodeValue : null;
|
|
}
|
|
|
|
private function findNamespacePrefixes(string $xpath): array
|
|
{
|
|
if (preg_match_all('/(?P<prefix>[a-z_][a-z_0-9\-\.]*+):[^"\/:]/i', $xpath, $matches)) {
|
|
return array_unique($matches['prefix']);
|
|
}
|
|
|
|
return [];
|
|
}
|
|
|
|
/**
|
|
* Creates a crawler for some subnodes.
|
|
*
|
|
* @param \DOMNodeList|\DOMNode|\DOMNode[]|string|null $nodes
|
|
*/
|
|
private function createSubCrawler(\DOMNodeList|\DOMNode|array|string|null $nodes): static
|
|
{
|
|
$crawler = new static($nodes, $this->uri, $this->baseHref);
|
|
$crawler->isHtml = $this->isHtml;
|
|
$crawler->document = $this->document;
|
|
$crawler->namespaces = $this->namespaces;
|
|
$crawler->cachedNamespaces = $this->cachedNamespaces;
|
|
$crawler->html5Parser = $this->html5Parser;
|
|
|
|
return $crawler;
|
|
}
|
|
|
|
/**
|
|
* @throws \LogicException If the CssSelector Component is not available
|
|
*/
|
|
private function createCssSelectorConverter(): CssSelectorConverter
|
|
{
|
|
if (!class_exists(CssSelectorConverter::class)) {
|
|
throw new \LogicException('To filter with a CSS selector, install the CssSelector component ("composer require symfony/css-selector"). Or use filterXpath instead.');
|
|
}
|
|
|
|
return new CssSelectorConverter($this->isHtml);
|
|
}
|
|
|
|
/**
|
|
* Parse string into DOMDocument object using HTML5 parser if the content is HTML5 and the library is available.
|
|
* Use libxml parser otherwise.
|
|
*/
|
|
private function parseHtmlString(string $content, string $charset): \DOMDocument
|
|
{
|
|
if ($this->canParseHtml5String($content)) {
|
|
return $this->parseHtml5($content, $charset);
|
|
}
|
|
|
|
return $this->parseXhtml($content, $charset);
|
|
}
|
|
|
|
private function canParseHtml5String(string $content): bool
|
|
{
|
|
if (null === $this->html5Parser) {
|
|
return false;
|
|
}
|
|
if (false === ($pos = stripos($content, '<!doctype html>'))) {
|
|
return false;
|
|
}
|
|
$header = substr($content, 0, $pos);
|
|
|
|
return '' === $header || $this->isValidHtml5Heading($header);
|
|
}
|
|
|
|
private function isValidHtml5Heading(string $heading): bool
|
|
{
|
|
return 1 === preg_match('/^\x{FEFF}?\s*(<!--[^>]*?-->\s*)*$/u', $heading);
|
|
}
|
|
}
|