--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DomCrawler;
+
+use Symfony\Component\CssSelector\CssSelectorConverter;
+
+/**
+ * Crawler eases navigation of a list of \DOMNode objects.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Crawler implements \Countable, \IteratorAggregate
+{
+ /**
+ * @var string The current URI
+ */
+ protected $uri;
+
+ /**
+ * @var string The default namespace prefix to be used with XPath and CSS expressions
+ */
+ private $defaultNamespacePrefix = 'default';
+
+ /**
+ * @var array A map of manually registered namespaces
+ */
+ private $namespaces = array();
+
+ /**
+ * @var string The base href value
+ */
+ private $baseHref;
+
+ /**
+ * @var \DOMDocument|null
+ */
+ private $document;
+
+ /**
+ * @var \DOMElement[]
+ */
+ private $nodes = array();
+
+ /**
+ * Whether the Crawler contains HTML or XML content (used when converting CSS to XPath).
+ *
+ * @var bool
+ */
+ private $isHtml = true;
+
+ /**
+ * @param mixed $node A Node to use as the base for the crawling
+ * @param string $currentUri The current URI
+ * @param string $baseHref The base href value
+ */
+ public function __construct($node = null, $currentUri = null, $baseHref = null)
+ {
+ $this->uri = $currentUri;
+ $this->baseHref = $baseHref ?: $currentUri;
+
+ $this->add($node);
+ }
+
+ /**
+ * Returns the current URI.
+ *
+ * @return string
+ */
+ public function getUri()
+ {
+ return $this->uri;
+ }
+
+ /**
+ * Returns base href.
+ *
+ * @return string
+ */
+ public function getBaseHref()
+ {
+ return $this->baseHref;
+ }
+
+ /**
+ * Removes all the nodes.
+ */
+ public function clear()
+ {
+ $this->nodes = array();
+ $this->document = null;
+ }
+
+ /**
+ * Adds a node to the current list of nodes.
+ *
+ * This method uses the appropriate specialized add*() method based
+ * on the type of the argument.
+ *
+ * @param \DOMNodeList|\DOMNode|array|string|null $node A node
+ *
+ * @throws \InvalidArgumentException When node is not the expected type.
+ */
+ public function add($node)
+ {
+ if ($node instanceof \DOMNodeList) {
+ $this->addNodeList($node);
+ } elseif ($node instanceof \DOMNode) {
+ $this->addNode($node);
+ } elseif (is_array($node)) {
+ $this->addNodes($node);
+ } elseif (is_string($node)) {
+ $this->addContent($node);
+ } elseif (null !== $node) {
+ throw new \InvalidArgumentException(sprintf('Expecting a DOMNodeList or DOMNode instance, an array, a string, or null, but got "%s".', is_object($node) ? get_class($node) : gettype($node)));
+ }
+ }
+
+ /**
+ * Adds HTML/XML content.
+ *
+ * If the charset is not set via the content type, it is assumed
+ * to be ISO-8859-1, which is the default charset defined by the
+ * HTTP 1.1 specification.
+ *
+ * @param string $content A string to parse as HTML/XML
+ * @param null|string $type The content type of the string
+ */
+ public function addContent($content, $type = null)
+ {
+ if (empty($type)) {
+ $type = 0 === strpos($content, '<?xml') ? 'application/xml' : 'text/html';
+ }
+
+ // DOM only for HTML/XML content
+ if (!preg_match('/(x|ht)ml/i', $type, $xmlMatches)) {
+ return;
+ }
+
+ $charset = null;
+ if (false !== $pos = stripos($type, 'charset=')) {
+ $charset = substr($type, $pos + 8);
+ if (false !== $pos = strpos($charset, ';')) {
+ $charset = substr($charset, 0, $pos);
+ }
+ }
+
+ // http://www.w3.org/TR/encoding/#encodings
+ // http://www.w3.org/TR/REC-xml/#NT-EncName
+ if (null === $charset &&
+ preg_match('/\<meta[^\>]+charset *= *["\']?([a-zA-Z\-0-9_:.]+)/i', $content, $matches)) {
+ $charset = $matches[1];
+ }
+
+ if (null === $charset) {
+ $charset = 'ISO-8859-1';
+ }
+
+ if ('x' === $xmlMatches[1]) {
+ $this->addXmlContent($content, $charset);
+ } else {
+ $this->addHtmlContent($content, $charset);
+ }
+ }
+
+ /**
+ * Adds an HTML content to the list of nodes.
+ *
+ * The libxml errors are disabled when the content is parsed.
+ *
+ * If you want to get parsing errors, be sure to enable
+ * internal errors via libxml_use_internal_errors(true)
+ * and then, get the errors via libxml_get_errors(). Be
+ * sure to clear errors with libxml_clear_errors() afterward.
+ *
+ * @param string $content The HTML content
+ * @param string $charset The charset
+ */
+ public function addHtmlContent($content, $charset = 'UTF-8')
+ {
+ $internalErrors = libxml_use_internal_errors(true);
+ $disableEntities = libxml_disable_entity_loader(true);
+
+ $dom = new \DOMDocument('1.0', $charset);
+ $dom->validateOnParse = true;
+
+ set_error_handler(function () { throw new \Exception(); });
+
+ try {
+ // Convert charset to HTML-entities to work around bugs in DOMDocument::loadHTML()
+ $content = mb_convert_encoding($content, 'HTML-ENTITIES', $charset);
+ } catch (\Exception $e) {
+ }
+
+ restore_error_handler();
+
+ if ('' !== trim($content)) {
+ @$dom->loadHTML($content);
+ }
+
+ libxml_use_internal_errors($internalErrors);
+ libxml_disable_entity_loader($disableEntities);
+
+ $this->addDocument($dom);
+
+ $base = $this->filterRelativeXPath('descendant-or-self::base')->extract(array('href'));
+
+ $baseHref = current($base);
+ if (count($base) && !empty($baseHref)) {
+ if ($this->baseHref) {
+ $linkNode = $dom->createElement('a');
+ $linkNode->setAttribute('href', $baseHref);
+ $link = new Link($linkNode, $this->baseHref);
+ $this->baseHref = $link->getUri();
+ } else {
+ $this->baseHref = $baseHref;
+ }
+ }
+ }
+
+ /**
+ * Adds an XML content to the list of nodes.
+ *
+ * The libxml errors are disabled when the content is parsed.
+ *
+ * If you want to get parsing errors, be sure to enable
+ * internal errors via libxml_use_internal_errors(true)
+ * and then, get the errors via libxml_get_errors(). Be
+ * sure to clear errors with libxml_clear_errors() afterward.
+ *
+ * @param string $content The XML content
+ * @param string $charset The charset
+ * @param int $options Bitwise OR of the libxml option constants
+ * LIBXML_PARSEHUGE is dangerous, see
+ * http://symfony.com/blog/security-release-symfony-2-0-17-released
+ */
+ public function addXmlContent($content, $charset = 'UTF-8', $options = LIBXML_NONET)
+ {
+ // remove the default namespace if it's the only namespace to make XPath expressions simpler
+ if (!preg_match('/xmlns:/', $content)) {
+ $content = str_replace('xmlns', 'ns', $content);
+ }
+
+ $internalErrors = libxml_use_internal_errors(true);
+ $disableEntities = libxml_disable_entity_loader(true);
+
+ $dom = new \DOMDocument('1.0', $charset);
+ $dom->validateOnParse = true;
+
+ if ('' !== trim($content)) {
+ @$dom->loadXML($content, $options);
+ }
+
+ libxml_use_internal_errors($internalErrors);
+ libxml_disable_entity_loader($disableEntities);
+
+ $this->addDocument($dom);
+
+ $this->isHtml = false;
+ }
+
+ /**
+ * Adds a \DOMDocument to the list of nodes.
+ *
+ * @param \DOMDocument $dom A \DOMDocument instance
+ */
+ public function addDocument(\DOMDocument $dom)
+ {
+ if ($dom->documentElement) {
+ $this->addNode($dom->documentElement);
+ }
+ }
+
+ /**
+ * Adds a \DOMNodeList to the list of nodes.
+ *
+ * @param \DOMNodeList $nodes A \DOMNodeList instance
+ */
+ public function addNodeList(\DOMNodeList $nodes)
+ {
+ foreach ($nodes as $node) {
+ if ($node instanceof \DOMNode) {
+ $this->addNode($node);
+ }
+ }
+ }
+
+ /**
+ * Adds an array of \DOMNode instances to the list of nodes.
+ *
+ * @param \DOMNode[] $nodes An array of \DOMNode instances
+ */
+ public function addNodes(array $nodes)
+ {
+ foreach ($nodes as $node) {
+ $this->add($node);
+ }
+ }
+
+ /**
+ * Adds a \DOMNode instance to the list of nodes.
+ *
+ * @param \DOMNode $node A \DOMNode instance
+ */
+ public function addNode(\DOMNode $node)
+ {
+ if ($node instanceof \DOMDocument) {
+ $node = $node->documentElement;
+ }
+
+ if (null !== $this->document && $this->document !== $node->ownerDocument) {
+ throw new \InvalidArgumentException('Attaching DOM nodes from multiple documents in the same crawler is forbidden.');
+ }
+
+ if (null === $this->document) {
+ $this->document = $node->ownerDocument;
+ }
+
+ // Don't add duplicate nodes in the Crawler
+ if (in_array($node, $this->nodes, true)) {
+ return;
+ }
+
+ $this->nodes[] = $node;
+ }
+
+ /**
+ * Returns a node given its position in the node list.
+ *
+ * @param int $position The position
+ *
+ * @return self
+ */
+ public function eq($position)
+ {
+ if (isset($this->nodes[$position])) {
+ return $this->createSubCrawler($this->nodes[$position]);
+ }
+
+ return $this->createSubCrawler(null);
+ }
+
+ /**
+ * Calls an anonymous function on each node of the list.
+ *
+ * The anonymous function receives the position and the node wrapped
+ * in a Crawler instance as arguments.
+ *
+ * Example:
+ *
+ * $crawler->filter('h1')->each(function ($node, $i) {
+ * return $node->text();
+ * });
+ *
+ * @param \Closure $closure An anonymous function
+ *
+ * @return array An array of values returned by the anonymous function
+ */
+ public function each(\Closure $closure)
+ {
+ $data = array();
+ foreach ($this->nodes as $i => $node) {
+ $data[] = $closure($this->createSubCrawler($node), $i);
+ }
+
+ return $data;
+ }
+
+ /**
+ * Slices the list of nodes by $offset and $length.
+ *
+ * @param int $offset
+ * @param int $length
+ *
+ * @return self
+ */
+ public function slice($offset = 0, $length = null)
+ {
+ return $this->createSubCrawler(array_slice($this->nodes, $offset, $length));
+ }
+
+ /**
+ * Reduces the list of nodes by calling an anonymous function.
+ *
+ * To remove a node from the list, the anonymous function must return false.
+ *
+ * @param \Closure $closure An anonymous function
+ *
+ * @return self
+ */
+ public function reduce(\Closure $closure)
+ {
+ $nodes = array();
+ foreach ($this->nodes as $i => $node) {
+ if (false !== $closure($this->createSubCrawler($node), $i)) {
+ $nodes[] = $node;
+ }
+ }
+
+ return $this->createSubCrawler($nodes);
+ }
+
+ /**
+ * Returns the first node of the current selection.
+ *
+ * @return self
+ */
+ public function first()
+ {
+ return $this->eq(0);
+ }
+
+ /**
+ * Returns the last node of the current selection.
+ *
+ * @return self
+ */
+ public function last()
+ {
+ return $this->eq(count($this->nodes) - 1);
+ }
+
+ /**
+ * Returns the siblings nodes of the current selection.
+ *
+ * @return self
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function siblings()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ return $this->createSubCrawler($this->sibling($this->getNode(0)->parentNode->firstChild));
+ }
+
+ /**
+ * Returns the next siblings nodes of the current selection.
+ *
+ * @return self
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function nextAll()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ return $this->createSubCrawler($this->sibling($this->getNode(0)));
+ }
+
+ /**
+ * Returns the previous sibling nodes of the current selection.
+ *
+ * @return self
+ *
+ * @throws \InvalidArgumentException
+ */
+ public function previousAll()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ return $this->createSubCrawler($this->sibling($this->getNode(0), 'previousSibling'));
+ }
+
+ /**
+ * Returns the parents nodes of the current selection.
+ *
+ * @return self
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function parents()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ $node = $this->getNode(0);
+ $nodes = array();
+
+ while ($node = $node->parentNode) {
+ if (XML_ELEMENT_NODE === $node->nodeType) {
+ $nodes[] = $node;
+ }
+ }
+
+ return $this->createSubCrawler($nodes);
+ }
+
+ /**
+ * Returns the children nodes of the current selection.
+ *
+ * @return self
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function children()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ $node = $this->getNode(0)->firstChild;
+
+ return $this->createSubCrawler($node ? $this->sibling($node) : array());
+ }
+
+ /**
+ * Returns the attribute value of the first node of the list.
+ *
+ * @param string $attribute The attribute name
+ *
+ * @return string|null The attribute value or null if the attribute does not exist
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function attr($attribute)
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ $node = $this->getNode(0);
+
+ return $node->hasAttribute($attribute) ? $node->getAttribute($attribute) : null;
+ }
+
+ /**
+ * Returns the node name of the first node of the list.
+ *
+ * @return string The node name
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function nodeName()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ return $this->getNode(0)->nodeName;
+ }
+
+ /**
+ * Returns the node value of the first node of the list.
+ *
+ * @return string The node value
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function text()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ return $this->getNode(0)->nodeValue;
+ }
+
+ /**
+ * Returns the first node of the list as HTML.
+ *
+ * @return string The node html
+ *
+ * @throws \InvalidArgumentException When current node is empty
+ */
+ public function html()
+ {
+ if (!$this->nodes) {
+ throw new \InvalidArgumentException('The current node list is empty.');
+ }
+
+ $html = '';
+ foreach ($this->getNode(0)->childNodes as $child) {
+ $html .= $child->ownerDocument->saveHTML($child);
+ }
+
+ return $html;
+ }
+
+ /**
+ * 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.
+ *
+ * @param string $xpath An XPath expression
+ *
+ * @return array|Crawler An array of evaluation results or a new Crawler instance
+ */
+ public function evaluate($xpath)
+ {
+ if (null === $this->document) {
+ throw new \LogicException('Cannot evaluate the expression on an uninitialized crawler.');
+ }
+
+ $data = array();
+ $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(array('_text', 'href'));
+ *
+ * @param array $attributes An array of attributes
+ *
+ * @return array An array of extracted values
+ */
+ public function extract($attributes)
+ {
+ $attributes = (array) $attributes;
+ $count = count($attributes);
+
+ $data = array();
+ foreach ($this->nodes as $node) {
+ $elements = array();
+ foreach ($attributes as $attribute) {
+ if ('_text' === $attribute) {
+ $elements[] = $node->nodeValue;
+ } else {
+ $elements[] = $node->getAttribute($attribute);
+ }
+ }
+
+ $data[] = $count > 1 ? $elements : $elements[0];
+ }
+
+ 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.
+ *
+ * @param string $xpath An XPath expression
+ *
+ * @return self
+ */
+ public function filterXPath($xpath)
+ {
+ $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.
+ *
+ * @param string $selector A CSS selector
+ *
+ * @return self
+ *
+ * @throws \RuntimeException if the CssSelector Component is not available
+ */
+ public function filter($selector)
+ {
+ if (!class_exists('Symfony\\Component\\CssSelector\\CssSelectorConverter')) {
+ throw new \RuntimeException('Unable to filter with a CSS selector as the Symfony CssSelector 2.8+ is not installed (you can use filterXPath instead).');
+ }
+
+ $converter = new CssSelectorConverter($this->isHtml);
+
+ // 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.
+ *
+ * @param string $value The link text
+ *
+ * @return self
+ */
+ public function selectLink($value)
+ {
+ $xpath = sprintf('descendant-or-self::a[contains(concat(\' \', normalize-space(string(.)), \' \'), %s) ', static::xpathLiteral(' '.$value.' ')).
+ sprintf('or ./img[contains(concat(\' \', normalize-space(string(@alt)), \' \'), %s)]]', static::xpathLiteral(' '.$value.' '));
+
+ return $this->filterRelativeXPath($xpath);
+ }
+
+ /**
+ * Selects images by alt value.
+ *
+ * @param string $value The image alt
+ *
+ * @return self A new instance of Crawler with the filtered list of nodes
+ */
+ public function selectImage($value)
+ {
+ $xpath = sprintf('descendant-or-self::img[contains(normalize-space(string(@alt)), %s)]', static::xpathLiteral($value));
+
+ return $this->filterRelativeXPath($xpath);
+ }
+
+ /**
+ * Selects a button by name or alt value for images.
+ *
+ * @param string $value The button text
+ *
+ * @return self
+ */
+ public function selectButton($value)
+ {
+ $translate = 'translate(@type, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz")';
+ $xpath = sprintf('descendant-or-self::input[((contains(%s, "submit") or contains(%s, "button")) and contains(concat(\' \', normalize-space(string(@value)), \' \'), %s)) ', $translate, $translate, static::xpathLiteral(' '.$value.' ')).
+ sprintf('or (contains(%s, "image") and contains(concat(\' \', normalize-space(string(@alt)), \' \'), %s)) or @id=%s or @name=%s] ', $translate, static::xpathLiteral(' '.$value.' '), static::xpathLiteral($value), static::xpathLiteral($value)).
+ sprintf('| descendant-or-self::button[contains(concat(\' \', normalize-space(string(.)), \' \'), %s) or @id=%s or @name=%s]', static::xpathLiteral(' '.$value.' '), static::xpathLiteral($value), static::xpathLiteral($value));
+
+ return $this->filterRelativeXPath($xpath);
+ }
+
+ /**
+ * Returns a Link object for the first node in the list.
+ *
+ * @param string $method The method for the link (get by default)
+ *
+ * @return Link A Link instance
+ *
+ * @throws \InvalidArgumentException If the current node list is empty or the selected node is not instance of DOMElement
+ */
+ public function link($method = 'get')
+ {
+ 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_class($node)));
+ }
+
+ return new Link($node, $this->baseHref, $method);
+ }
+
+ /**
+ * Returns an array of Link objects for the nodes in the list.
+ *
+ * @return Link[] An array of Link instances
+ *
+ * @throws \InvalidArgumentException If the current node list contains non-DOMElement instances
+ */
+ public function links()
+ {
+ $links = array();
+ foreach ($this->nodes as $node) {
+ if (!$node instanceof \DOMElement) {
+ throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', get_class($node)));
+ }
+
+ $links[] = new Link($node, $this->baseHref, 'get');
+ }
+
+ return $links;
+ }
+
+ /**
+ * Returns an Image object for the first node in the list.
+ *
+ * @return Image An Image instance
+ *
+ * @throws \InvalidArgumentException If the current node list is empty
+ */
+ public function image()
+ {
+ if (!count($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_class($node)));
+ }
+
+ return new Image($node, $this->baseHref);
+ }
+
+ /**
+ * Returns an array of Image objects for the nodes in the list.
+ *
+ * @return Image[] An array of Image instances
+ */
+ public function images()
+ {
+ $images = array();
+ foreach ($this as $node) {
+ if (!$node instanceof \DOMElement) {
+ throw new \InvalidArgumentException(sprintf('The current node list should contain only DOMElement instances, "%s" found.', get_class($node)));
+ }
+
+ $images[] = new Image($node, $this->baseHref);
+ }
+
+ return $images;
+ }
+
+ /**
+ * Returns a Form object for the first node in the list.
+ *
+ * @param array $values An array of values for the form fields
+ * @param string $method The method for the form
+ *
+ * @return Form A Form instance
+ *
+ * @throws \InvalidArgumentException If the current node list is empty or the selected node is not instance of DOMElement
+ */
+ public function form(array $values = null, $method = null)
+ {
+ if (!$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_class($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.
+ *
+ * @param string $prefix
+ */
+ public function setDefaultNamespacePrefix($prefix)
+ {
+ $this->defaultNamespacePrefix = $prefix;
+ }
+
+ /**
+ * @param string $prefix
+ * @param string $namespace
+ */
+ public function registerNamespace($prefix, $namespace)
+ {
+ $this->namespaces[$prefix] = $namespace;
+ }
+
+ /**
+ * Converts string for XPath expressions.
+ *
+ * Escaped characters are: quotes (") and apostrophe (').
+ *
+ * Examples:
+ * <code>
+ * 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')
+ * </code>
+ *
+ * @param string $s String to be escaped
+ *
+ * @return string Converted string
+ */
+ public static function xpathLiteral($s)
+ {
+ if (false === strpos($s, "'")) {
+ return sprintf("'%s'", $s);
+ }
+
+ if (false === strpos($s, '"')) {
+ return sprintf('"%s"', $s);
+ }
+
+ $string = $s;
+ $parts = array();
+ 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.
+ *
+ * @param string $xpath
+ *
+ * @return self
+ */
+ private function filterRelativeXPath($xpath)
+ {
+ $prefixes = $this->findNamespacePrefixes($xpath);
+
+ $crawler = $this->createSubCrawler(null);
+
+ foreach ($this->nodes as $node) {
+ $domxpath = $this->createDOMXPath($node->ownerDocument, $prefixes);
+ $crawler->add($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.
+ *
+ * @param string $xpath
+ *
+ * @return string
+ */
+ private function relativize($xpath)
+ {
+ $expressions = array();
+
+ // An expression which will never match to replace expressions which cannot match in the crawler
+ // We cannot simply 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 - $startPosition));
+
+ if (0 === strpos($expression, 'self::*/')) {
+ $expression = './'.substr($expression, 8);
+ }
+
+ // add prefix before absolute element selector
+ if ('' === $expression) {
+ $expression = $nonMatchingExpression;
+ } elseif (0 === strpos($expression, '//')) {
+ $expression = 'descendant-or-self::'.substr($expression, 2);
+ } elseif (0 === strpos($expression, './/')) {
+ $expression = 'descendant-or-self::'.substr($expression, 3);
+ } elseif (0 === strpos($expression, './')) {
+ $expression = 'self::'.substr($expression, 2);
+ } elseif (0 === strpos($expression, 'child::')) {
+ $expression = 'self::'.substr($expression, 7);
+ } elseif ('/' === $expression[0] || '.' === $expression[0] || 0 === strpos($expression, 'self::')) {
+ $expression = $nonMatchingExpression;
+ } elseif (0 === strpos($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 = $nonMatchingExpression;
+ } elseif (0 !== strpos($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
+ }
+
+ /**
+ * @param int $position
+ *
+ * @return \DOMElement|null
+ */
+ public function getNode($position)
+ {
+ if (isset($this->nodes[$position])) {
+ return $this->nodes[$position];
+ }
+ }
+
+ /**
+ * @return int
+ */
+ public function count()
+ {
+ return count($this->nodes);
+ }
+
+ /**
+ * @return \ArrayIterator
+ */
+ public function getIterator()
+ {
+ return new \ArrayIterator($this->nodes);
+ }
+
+ /**
+ * @param \DOMElement $node
+ * @param string $siblingDir
+ *
+ * @return array
+ */
+ protected function sibling($node, $siblingDir = 'nextSibling')
+ {
+ $nodes = array();
+
+ do {
+ if ($node !== $this->getNode(0) && $node->nodeType === 1) {
+ $nodes[] = $node;
+ }
+ } while ($node = $node->$siblingDir);
+
+ return $nodes;
+ }
+
+ /**
+ * @param \DOMDocument $document
+ * @param array $prefixes
+ *
+ * @return \DOMXPath
+ *
+ * @throws \InvalidArgumentException
+ */
+ private function createDOMXPath(\DOMDocument $document, array $prefixes = array())
+ {
+ $domxpath = new \DOMXPath($document);
+
+ foreach ($prefixes as $prefix) {
+ $namespace = $this->discoverNamespace($domxpath, $prefix);
+ if (null !== $namespace) {
+ $domxpath->registerNamespace($prefix, $namespace);
+ }
+ }
+
+ return $domxpath;
+ }
+
+ /**
+ * @param \DOMXPath $domxpath
+ * @param string $prefix
+ *
+ * @return string
+ *
+ * @throws \InvalidArgumentException
+ */
+ private function discoverNamespace(\DOMXPath $domxpath, $prefix)
+ {
+ if (isset($this->namespaces[$prefix])) {
+ return $this->namespaces[$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 ? '' : $prefix));
+
+ if ($node = $namespaces->item(0)) {
+ return $node->nodeValue;
+ }
+ }
+
+ /**
+ * @param string $xpath
+ *
+ * @return array
+ */
+ private function findNamespacePrefixes($xpath)
+ {
+ if (preg_match_all('/(?P<prefix>[a-z_][a-z_0-9\-\.]*+):[^"\/:]/i', $xpath, $matches)) {
+ return array_unique($matches['prefix']);
+ }
+
+ return array();
+ }
+
+ /**
+ * Creates a crawler for some subnodes.
+ *
+ * @param \DOMElement|\DOMElement[]|\DOMNodeList|null $nodes
+ *
+ * @return static
+ */
+ private function createSubCrawler($nodes)
+ {
+ $crawler = new static($nodes, $this->uri, $this->baseHref);
+ $crawler->isHtml = $this->isHtml;
+ $crawler->document = $this->document;
+ $crawler->namespaces = $this->namespaces;
+
+ return $crawler;
+ }
+}
projects / yaffs-website / blobdiff