[DomCrawler] Add support for XPath expression evaluation
This commit is contained in:
parent
695549fdde
commit
3148fad236
@ -592,6 +592,36 @@ class Crawler implements \Countable, \IteratorAggregate
|
||||
return $html;
|
||||
}
|
||||
|
||||
/**
|
||||
* Evaluates an XPath expression.
|
||||
*
|
||||
* Since an XPath expression might evaluate to either a simple type or a \DOMDoneList,
|
||||
* 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.
|
||||
*
|
||||
|
@ -1061,6 +1061,51 @@ HTML;
|
||||
$this->assertCount(1, $crawler->filter('li:contains("List item 1")'));
|
||||
}
|
||||
|
||||
public function testEvaluateReturnsTypedResultOfXPathExpressionOnADocumentSubset()
|
||||
{
|
||||
$crawler = $this->createTestCrawler();
|
||||
|
||||
$result = $crawler->filterXPath('//form/input')->evaluate('substring-before(@name, "Name")');
|
||||
|
||||
$this->assertSame(array('Text', 'Foo', 'Bar'), $result);
|
||||
}
|
||||
|
||||
public function testEvaluateReturnsTypedResultOfNamespacedXPathExpressionOnADocumentSubset()
|
||||
{
|
||||
$crawler = $this->createTestXmlCrawler();
|
||||
|
||||
$result = $crawler->filterXPath('//yt:accessControl/@action')->evaluate('string(.)');
|
||||
|
||||
$this->assertSame(array('comment', 'videoRespond'), $result);
|
||||
}
|
||||
|
||||
public function testEvaluateReturnsTypedResultOfNamespacedXPathExpression()
|
||||
{
|
||||
$crawler = $this->createTestXmlCrawler();
|
||||
$crawler->registerNamespace('youtube', 'http://gdata.youtube.com/schemas/2007');
|
||||
|
||||
$result = $crawler->evaluate('string(//youtube:accessControl/@action)');
|
||||
|
||||
$this->assertSame(array('comment'), $result);
|
||||
}
|
||||
|
||||
public function testEvaluateReturnsACrawlerIfXPathExpressionEvaluatesToANode()
|
||||
{
|
||||
$crawler = $this->createTestCrawler()->evaluate('//form/input[1]');
|
||||
|
||||
$this->assertInstanceOf(Crawler::class, $crawler);
|
||||
$this->assertCount(1, $crawler);
|
||||
$this->assertSame('input', $crawler->first()->nodeName());
|
||||
}
|
||||
|
||||
/**
|
||||
* @expectedException \LogicException
|
||||
*/
|
||||
public function testEvaluateThrowsAnExceptionIfDocumentIsEmpty()
|
||||
{
|
||||
(new Crawler())->evaluate('//form/input[1]');
|
||||
}
|
||||
|
||||
public function createTestCrawler($uri = null)
|
||||
{
|
||||
$dom = new \DOMDocument();
|
||||
|
Reference in New Issue
Block a user