ipl/Attributes: allow a prefix, helps with data-*

library/vendor/ipl/Html/Attributes.php

@@ -13,6 +13,9 @@ class Attributes
     /** @var callable */
     protected $callbacks = array();
 
+    /** @var string */
+    protected $prefix = '';
+
     /**
      * Attributes constructor.
      * @param Attribute[] $attributes
@@ -121,6 +124,8 @@ class Attributes
             foreach ($attribute as $name => $value) {
                 $this->set($name, $value);
             }
+
+            return $this;
         } else {
             return $this->setAttribute(new Attribute($attribute, $value));
         }
@@ -239,6 +244,20 @@ class Attributes
 
             $parts[] = $attribute->render();
         }
-        return ' ' . implode(' ', $parts);
+
+        $separator = ' ' . $this->prefix;
+
+        return $separator . implode($separator, $parts);
+    }
+
+    /**
+     * @param string $prefix
+     * @return $this
+     */
+    public function setPrefix($prefix)
+    {
+        $this->prefix = $prefix;
+
+        return $this;
     }
 }

library/vendor/ipl/Html/BaseElement.php

@@ -135,7 +135,7 @@ abstract class BaseElement extends Html
             return sprintf(
                 '<%s%s>%s</%s>',
                 $tag,
-                $this->attributes()->render(),
+                $this->renderAttributes(),
                 $content,
                 $tag
             );
@@ -143,11 +143,20 @@ abstract class BaseElement extends Html
             return sprintf(
                 '<%s%s />',
                 $tag,
-                $this->attributes()->render()
+                $this->renderAttributes()
             );
         }
     }
 
+    public function renderAttributes()
+    {
+        if ($this->attributes === null && empty($this->defaultAttributes)) {
+            return '';
+        } else {
+            return $this->attributes()->render();
+        }
+    }
+
     public function wantsClosingTag()
     {
         // TODO: There is more. SVG and MathML namespaces