8000 [DomCrawler] Add support for XPath expression evaluation · symfony/symfony@3148fad · GitHub
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[DomCrawler] Add support for XPath expression evaluation
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‎src/Symfony/Component/DomCrawler/Crawler.php

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@@ -592,6 +592,36 @@ public function html()
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return $html;
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}
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/**
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* Evaluates an XPath expression.
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*
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* Since an XPath expression might evaluate to either a simple type or a \DOMDoneList,
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* this method will return either an array of simple types or a new Crawler instance.
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*
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* @param string $xpath An XPath expression
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*
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* @return array|Crawler An array of evaluation results or a new Crawler instance
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*/
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public function evaluate($xpath)
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{
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if (null === $this->document) {
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throw new \LogicException('Cannot evaluate the expression on an uninitialized crawler.');
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}
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$data = array();
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$domxpath = $this->createDOMXPath($this->document, $this->findNamespacePrefixes($xpath));
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foreach ($this->nodes as $node) {
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$data[] = $domxpath->evaluate($xpath, $node);
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}
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if (isset($data[0]) && $data[0] instanceof \DOMNodeList) {
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return $this->createSubCrawler($data);
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}
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return $data;
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}
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/**
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* Extracts information from the list of nodes.
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*

‎src/Symfony/Component/DomCrawler/Tests/CrawlerTest.php

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@@ -1061,6 +1061,51 @@ public function testCountOfNestedElements()
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$this->assertCount(1, $crawler->filter('li:contains("List item 1")'));
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}
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public function testEvaluateReturnsTypedResultOfXPathExpressionOnADocumentSubset()
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{
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$crawler = $this->createTestCrawler();
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$result = $crawler->filterXPath('//form/input')->evaluate('substring-before(@name, "Name")');
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$this->assertSame(array('Text', 'Foo', 'Bar'), $result);
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}
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public function testEvaluateReturnsTypedResultOfNamespacedXPathExpressionOnADocumentSubset()
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{
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$crawler = $this->createTestXmlCrawler();
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$result = $crawler->filterXPath('//yt:accessControl/@action')->evaluate('string(.)');
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$this->assertSame(array('comment', 'videoRespond'), $result);
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}
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public function testEvaluateReturnsTypedResultOfNamespacedXPathExpression()
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{
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$crawler = $this->createTestXmlCrawler();
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$crawler->registerNamespace('youtube', 'http://gdata.youtube.com/schemas/2007');
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$result = $crawler->evaluate('string(//youtube:accessControl/@action)');
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$this->assertSame(array('comment'), $result);
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}
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public function testEvaluateReturnsACrawlerIfXPathExpressionEvaluatesToANode()
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{
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$crawler = $this->createTestCrawler()->evaluate('//form/input[1]');
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$this->assertInstanceOf(Crawler::class, $crawler);
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$this->assertCount(1, $crawler);
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$this->assertSame('input', $crawler->first()->nodeName());
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}
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/**
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* @expectedException \LogicException
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*/
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public function testEvaluateThrowsAnExceptionIfDocumentIsEmpty()
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{
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(new Crawler())->evaluate('//form/input[1]');
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}
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public function createTestCrawler($uri = null)
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{
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$dom = new \DOMDocument();

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