[DomCrawler] Fixed filterXPath() chaining

Author: robbertkl

src/Symfony/Component/DomCrawler/Crawler.php

@@ -441,7 +441,7 @@ public function parents()
         $nodes = array();
 
         while ($node = $node->parentNode) {
-            if (1 === $node->nodeType && '_root' !== $node->nodeName) {
+            if (1 === $node->nodeType) {
                 $nodes[] = $node;
             }
         }
@@ -584,15 +584,13 @@ public function extract($attributes)
      */
     public function filterXPath($xpath)
     {
-        $document = new \DOMDocument('1.0', 'UTF-8');
-        $root = $document->appendChild($document->createElement('_root'));
+        $crawler = new static(null, $this->uri);
         foreach ($this as $node) {
-            $root->appendChild($document->importNode($node, true));
+            $domxpath = new \DOMXPath($node->ownerDocument);
+            $crawler->add($domxpath->query($xpath, $node));
         }
 
-        $domxpath = new \DOMXPath($document);
-
-        return new static($domxpath->query($xpath), $this->uri);
+        return $crawler;
     }
 
     /**

src/Symfony/Component/DomCrawler/Field/FormField.php

@@ -52,13 +52,7 @@ public function __construct(\DOMNode $node)
     {
         $this->node = $node;
         $this->name = $node->getAttribute('name');
-
-        $this->document = new \DOMDocument('1.0', 'UTF-8');
-        $this->node = $this->document->importNode($this->node, true);
-
-        $root = $this->document->appendChild($this->document->createElement('_root'));
-        $root->appendChild($this->node);
-        $this->xpath = new \DOMXPath($this->document);
+        $this->xpath = new \DOMXPath($node->ownerDocument);
 
         $this->initialize();
     }

src/Symfony/Component/DomCrawler/Form.php

@@ -378,9 +378,7 @@ private function initialize()
     {
         $this->fields = new FormFieldRegistry();
 
-        $document = new \DOMDocument('1.0', 'UTF-8');
-        $xpath = new \DOMXPath($document);
-        $root = $document->appendChild($document->createElement('_root'));
+        $xpath = new \DOMXPath($this->node->ownerDocument);
 
         // add submitted button if it has a valid name
         if ('form' !== $this->button->nodeName && $this->button->hasAttribute('name') && $this->button->getAttribute('name')) {
@@ -390,39 +388,33 @@ private function initialize()
 
                 // temporarily change the name of the input node for the x coordinate
                 $this->button->setAttribute('name', $name.'.x');
-                $this->set(new Field\InputFormField($document->importNode($this->button, true)));
+                $this->set(new Field\InputFormField($this->button));
 
                 // temporarily change the name of the input node for the y coordinate
                 $this->button->setAttribute('name', $name.'.y');
-                $this->set(new Field\InputFormField($document->importNode($this->button, true)));
+                $this->set(new Field\InputFormField($this->button));
 
                 // restore the original name of the input node
                 $this->button->setAttribute('name', $name);
-            }
-            else {
-                $this->set(new Field\InputFormField($document->importNode($this->button, true)));
+            } else {
+                $this->set(new Field\InputFormField($this->button));
             }
         }
 
         // find form elements corresponding to the current form
         if ($this->node->hasAttribute('id')) {
-            // traverse through the whole document
-            $node = $document->importNode($this->node->ownerDocument->documentElement, true);
-            $root->appendChild($node);
-
             // corresponding elements are either descendants or have a matching HTML5 form attribute
             $formId = Crawler::xpathLiteral($this->node->getAttribute('id'));
-            $fieldNodes = $xpath->query(sprintf('descendant::input[@form=%s] | descendant::button[@form=%s] | descendant::textarea[@form=%s] | descendant::select[@form=%s] | //form[@id=%s]//input[not(@form)] | //form[@id=%s]//button[not(@form)] | //form[@id=%s]//textarea[not(@form)] | //form[@id=%s]//select[not(@form)]', $formId, $formId, $formId, $formId, $formId, $formId, $formId, $formId), $root);
+
+            // do the xpath query without $this->node as the context node (i.e. traverse through the whole document)
+            $fieldNodes = $xpath->query(sprintf('descendant::input[@form=%s] | descendant::button[@form=%s] | descendant::textarea[@form=%s] | descendant::select[@form=%s] | //form[@id=%s]//input[not(@form)] | //form[@id=%s]//button[not(@form)] | //form[@id=%s]//textarea[not(@form)] | //form[@id=%s]//select[not(@form)]', $formId, $formId, $formId, $formId, $formId, $formId, $formId, $formId));
             foreach ($fieldNodes as $node) {
                 $this->addField($node);
             }
         } else {
-            // parent form has no id, add descendant elements only
-            $node = $document->importNode($this->node, true);
-            $root->appendChild($node);
-
-            // descendant elements with form attribute are not part of this form
-            $fieldNodes = $xpath->query('descendant::input[not(@form)] | descendant::button[not(@form)] | descendant::textarea[not(@form)] | descendant::select[not(@form)]', $root);
+            // do the xpath query with $this->node as the context node, to only find descendant elements
+            // however, descendant elements with form attribute are not part of this form
+            $fieldNodes = $xpath->query('descendant::input[not(@form)] | descendant::button[not(@form)] | descendant::textarea[not(@form)] | descendant::select[not(@form)]', $this->node);
             foreach ($fieldNodes as $node) {
                 $this->addField($node);
             }

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

@@ -378,8 +378,10 @@ public function testFilterXPath()
         $this->assertInstanceOf('Symfony\\Component\\DomCrawler\\Crawler', $crawler, '->filterXPath() returns a new instance of a crawler');
 
         $crawler = $this->createTestCrawler()->filterXPath('//ul');
-
         $this->assertCount(6, $crawler->filterXPath('//li'), '->filterXPath() filters the node list with the XPath expression');
+
+        $crawler = $this->createTestCrawler();
+        $this->assertCount(3, $crawler->filterXPath('//body')->filterXPath('//button')->parents(), '->filterXpath() preserves parents when chained');
     }
 
     /**