Refactored long switch case with duplicate code to lookup table

This is more performant(can be ignored but an extra) due to nature of lookup tables. Also it is more compact and has ease of extension. It is a little bit scary at the first sight though.

src/MicrodataDOMElement.php

@@ -4,6 +4,27 @@ namespace YusufKandemir\MicrodataParser;
 
 class MicrodataDOMElement extends \DOMElement
 {
+    /** @var array "tag name" to "attribute name" mapping */
+    private static $tagNameLookup = [
+        'audio' => 'src',
+        'embed' => 'src',
+        'iframe' => 'src',
+        'img' => 'src',
+        'source' => 'src',
+        'track' => 'src',
+        'video' => 'src',
+        'a' => 'href',
+        'area' => 'href',
+        'link' => 'href',
+        'object' => 'data',
+        'data' => 'value',
+        'meter' => 'value',
+        'time' => 'datetime',
+    ];
+
+    /** @var array Attributes that have absolute values */
+    private static $absoluteAttributes = ['src', 'href', 'data',];
+
     /**
      * @see https://www.w3.org/TR/2018/WD-microdata-20180426/#dfn-item-properties for details of algorithm
      *
@@ -87,51 +108,18 @@ class MicrodataDOMElement extends \DOMElement
 
         $base = $this->ownerDocument->documentURI;
 
-        switch ($this->tagName) {
+        $value = '';
-            case 'audio':
-            case 'embed':
-            case 'iframe':
-            case 'img':
-            case 'source':
-            case 'track':
-            case 'video':
-                if ($this->hasAttribute('src')) {
-                    $result = $this->getAttribute('src');
 
-                    // @todo check against protocol relative urls like "//example.com/test.jpg"
+        if (\array_key_exists($this->tagName, self::$tagNameLookup)) {
-                    return $this->isAbsoluteUri($result) ? $result : $base.$result;
+            $attribute = self::$tagNameLookup[$this->tagName];
-                }
+            $value = $this->getAttribute($attribute);
-                // No break
-            case 'a':
-            case 'area':
-            case 'link':
-                if ($this->hasAttribute('href')) {
-                    $result = $this->getAttribute('href');
 
-                    return $this->isAbsoluteUri($result) ? $result : $base.$result;
+            if (!empty($value) && \in_array($attribute, self::$absoluteAttributes) && !$this->isAbsoluteUri($value)) {
-                }
+                $value = $base . $value;
-                // No break
+            }
-            case 'object':
-                if ($this->hasAttribute('data')) {
-                    $result = $this->getAttribute('data');
-
-                    return $this->isAbsoluteUri($result) ? $result : $base.$result;
-                }
-                // No break
-            case 'data':
-            case 'meter':
-                if ($this->hasAttribute('value')) {
-                    return $this->getAttribute('value');
-                }
-                // No break
-            case 'time':
-                if ($this->hasAttribute('datetime')) {
-                    return $this->getAttribute('datetime');
-                }
-                // No break
-            default:
-                return $this->textContent;
         }
+
+        return $value ?: $this->textContent;
     }
 
     /**