Write any remaining attributes to the urlset element before writing sub-elements (#34)

* Write any remaining attributes to the urlset element before writing sub-elements.

Fixes #33.

* Fix tests

Author: lushc

spec/UrlSpec.php

@@ -4,8 +4,6 @@
 
 use PhpSpec\ObjectBehavior;
 use Prophecy\Argument;
-use Thepixeldeveloper\Sitemap\Subelements\Image;
-use XMLWriter;
 
 class UrlSpec extends ObjectBehavior
 {
@@ -38,19 +36,4 @@ function it_should_have_a_priority()
     {
         $this->getPriority()->shouldReturn(null);
     }
-
-    function it_should_only_append_attributes_once_for_each_subelement_type(XMLWriter $xmlWriter, Image $image)
-    {
-        $xmlWriter->startElement('url')->shouldBeCalled();
-        $xmlWriter->writeElement('loc', 'http://www.example.com/')->shouldBeCalled();
-        $xmlWriter->endElement()->shouldBeCalled();
-
-        $this->addSubElement($image);
-        $this->addSubElement($image);
-
-        $image->appendAttributeToCollectionXML($xmlWriter)->shouldBeCalled();
-        $image->generateXML($xmlWriter)->shouldBeCalled();
-
-        $this->generateXML($xmlWriter);
-    }
 }

spec/UrlsetSpec.php

@@ -5,6 +5,9 @@
 use PhpSpec\ObjectBehavior;
 use Prophecy\Argument;
 use Thepixeldeveloper\Sitemap\Url;
+use Thepixeldeveloper\Sitemap\Subelements\Image;
+use Thepixeldeveloper\Sitemap\Subelements\Video;
+use XMLWriter;
 
 class UrlsetSpec extends ObjectBehavior
 {
@@ -24,4 +27,26 @@ function it_should_return_the_urls_added(Url $url)
 
         $this->getUrls()->shouldReturn([$url]);
     }
+
+    function it_should_only_append_attributes_once_for_each_subelement_type(XMLWriter $xmlWriter, Url $url, Image $image, Video $video)
+    {
+        $xmlWriter->startElement('urlset')->shouldBeCalled();
+        $xmlWriter->writeAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance')->shouldBeCalled();
+        $xmlWriter->writeAttribute('xsi:schemaLocation', 'http://www.sitemaps.org/schemas/sitemap/0.9 ' . 'http://www.sitemaps.org/schemas/sitemap/0.9/siteindex.xsd')->shouldBeCalled();
+        $xmlWriter->writeAttribute('xmlns', 'http://www.sitemaps.org/schemas/sitemap/0.9')->shouldBeCalled();
+
+        $url->getSubelementsThatAppend()->willReturn([$image, $video]);
+        $this->appendSubelementAttribute($xmlWriter, $image)->shouldReturn(true);
+        $this->appendSubelementAttribute($xmlWriter, $image)->shouldReturn(false);
+        $this->appendSubelementAttribute($xmlWriter, $video)->shouldReturn(true);
+        $this->appendSubelementAttribute($xmlWriter, $video)->shouldReturn(false);
+
+        $image->appendAttributeToCollectionXML($xmlWriter)->shouldBeCalled();
+        $video->appendAttributeToCollectionXML($xmlWriter)->shouldBeCalled();
+        $url->generateXML($xmlWriter)->shouldBeCalled();
+        $xmlWriter->endElement()->shouldBeCalled();
+
+        $this->addUrl($url);
+        $this->generateXML($xmlWriter);
+    }
 }

src/Url.php

@@ -68,10 +68,6 @@ public function __construct($loc)
      */
     public function generateXML(XMLWriter $XMLWriter)
     {
-        foreach ($this->getSubelementsThatAppend() as $subelement) {
-            $subelement->appendAttributeToCollectionXML($XMLWriter);
-        }
-
         $XMLWriter->startElement('url');
         $XMLWriter->writeElement('loc', $this->getLoc());
 

src/Urlset.php

@@ -18,6 +18,13 @@ class Urlset implements OutputInterface
      */
     protected $urls = [];
 
+    /**
+     * Sub-elements that have been appended to the collection attributes.
+     *
+     * @var AppendAttributeInterface[]
+     */
+    protected $appendedSubelements = [];
+
     /**
      * Add a new URL object.
      *
@@ -47,6 +54,12 @@ public function generateXML(XMLWriter $XMLWriter)
 
         $XMLWriter->writeAttribute('xmlns', 'http://www.sitemaps.org/schemas/sitemap/0.9');
 
+        foreach ($this->getUrls() as $url) {
+            foreach ($url->getSubelementsThatAppend() as $subelement) {
+                $this->appendSubelementAttribute($XMLWriter, $subelement);
+            }
+        }
+
         foreach ($this->getUrls() as $url) {
             $url->generateXML($XMLWriter);
         }
@@ -63,4 +76,24 @@ public function getUrls()
     {
         return $this->urls;
     }
+
+    /**
+     * Appends the sub-element to the collection attributes if it has yet to be visited.
+     *
+     * @param XMLWriter $XMLWriter
+     * @param OutputInterface $subelement
+     *
+     * @return boolean
+     */
+    public function appendSubelementAttribute(XMLWriter $XMLWriter, OutputInterface $subelement)
+    {
+        if (array_key_exists(get_class($subelement), $this->appendedSubelements)) {
+            return false;
+        }
+
+        $subelement->appendAttributeToCollectionXML($XMLWriter);
+        $this->appendedSubelements[get_class($subelement)] = $subelement;
+
+        return true;
+    }
 }