Added removeAttribute and removeAllAttributes tag methods

fixes #57

src/PHPHtmlParser/Dom/AbstractNode.php

@@ -12,6 +12,8 @@
  * @property string outerhtml
  * @property string innerhtml
  * @property string text
+ * @property \PHPHtmlParser\Dom\Tag tag
+ * @property InnerNode parent
  */
 abstract class AbstractNode
 {
@@ -78,6 +80,9 @@ public function __get($key)
                 return $this->innerHtml();
             case 'text':
                 return $this->text();
+            case 'tag':
+                return $this->getTag();
+            case 'parent': $this->getParent();
         }
 
         return null;
@@ -214,33 +219,6 @@ public function getAncestor($id)
         return null;
     }
 
-    /**
-     * Shortcut to return the first child.
-     *
-     * @return AbstractNode
-     * @uses $this->getChild()
-     */
-    public function firstChild()
-    {
-        reset($this->children);
-        $key = key($this->children);
-
-        return $this->getChild($key);
-    }
-
-    /**
-     * Attempts to get the last child.
-     *
-     * @return AbstractNode
-     */
-    public function lastChild()
-    {
-        end($this->children);
-        $key = key($this->children);
-
-        return $this->getChild($key);
-    }
-
     /**
      * Attempts to get the next sibling.
      *
@@ -329,6 +307,29 @@ public function setAttribute($key, $value)
         return $this;
     }
 
+    /**
+     * A wrapper method that simply calls the removeAttribute method
+     * on the tag of this node.
+     *
+     * @param string $key
+     * @return void
+     */
+    public function removeAttribute($key)
+    {
+        $this->tag->removeAttribute($key);
+    }
+
+    /**
+     * A wrapper method that simply calls the removeAllAttributes
+     * method on the tag of this node.
+     *
+     * @return void
+     */
+    public function removeAllAttributes()
+    {
+        $this->tag->removeAllAttributes();
+    }
+
     /**
      * Function to locate a specific ancestor tag in the path to the root.
      *

src/PHPHtmlParser/Dom/InnerNode.php

@@ -244,6 +244,33 @@ public function replaceChild($childId, AbstractNode $newChild)
         unset($oldChild);
     }
 
+    /**
+     * Shortcut to return the first child.
+     *
+     * @return AbstractNode
+     * @uses $this->getChild()
+     */
+    public function firstChild()
+    {
+        reset($this->children);
+        $key = key($this->children);
+
+        return $this->getChild($key);
+    }
+
+    /**
+     * Attempts to get the last child.
+     *
+     * @return AbstractNode
+     */
+    public function lastChild()
+    {
+        end($this->children);
+        $key = key($this->children);
+
+        return $this->getChild($key);
+    }
+
     /**
      * Checks if the given node id is a descendant of the
      * current node.

src/PHPHtmlParser/Dom/Tag.php

@@ -136,7 +136,7 @@ public function noise($noise)
      * Set an attribute for this tag.
      *
      * @param string $key
-     * @param mixed $value
+     * @param string|array $value
      * @return $this
      */
     public function setAttribute($key, $value)
@@ -153,6 +153,28 @@ public function setAttribute($key, $value)
         return $this;
     }
 
+    /**
+     * Removes an attribute from this tag.
+     *
+     * @param $key
+     * @return void
+     */
+    public function removeAttribute($key)
+    {
+        $key = strtolower($key);
+        unset($this->attr[$key]);
+    }
+
+    /**
+     * Removes all attributes on this tag.
+     *
+     * @return void
+     */
+    public function removeAllAttributes()
+    {
+        $this->attr = [];
+    }
+
     /**
      * Sets the attributes for this tag
      *

tests/Node/HtmlTest.php

@@ -47,17 +47,15 @@ public function testInnerHtmlTwice()
 			],
 		]);
 		$a = new Tag('a');
-		$a->setAttributes([
-			'href' => [
-				'value'       => 'http://google.com',
-				'doubleQuote' => false,
-			],
-		]);
 		$br = new Tag('br');
 		$br->selfClosing();
 
 		$parent  = new HtmlNode($div);
 		$childa  = new HtmlNode($a);
+		$childa->setAttribute('href', [
+            'value'       => 'http://google.com',
+            'doubleQuote' => false,
+		]);
 		$childbr = new HtmlNode($br);
 		$parent->addChild($childa);
 		$parent->addChild($childbr);
@@ -370,6 +368,23 @@ public function testSetAttribute()
 		$this->assertEquals('foo', $node->getAttribute('class'));
 	}
 
+	public function testRemoveAttribute()
+	{
+		$node = new HtmlNode('a');
+		$node->setAttribute('class', 'foo');
+		$node->removeAttribute('class');
+		$this->assertnull($node->getAttribute('class'));
+	}
+
+	public function testRemoveAllAttributes()
+	{
+		$node = new HtmlNode('a');
+		$node->setAttribute('class', 'foo');
+		$node->setAttribute('href', 'http://google.com');
+		$node->removeAllAttributes();
+		$this->assertEquals(0, count($node->getAttributes()));
+	}
+
 	public function testCountable()
 	{
 		$div = new Tag('div');

tests/Node/TagTest.php

@@ -25,6 +25,30 @@ public function testSetAttributes()
 		$this->assertEquals('http://google.com', $tag->getAttribute('href')['value']);
 	}
 
+	public function testRemoveAttribute()
+	{
+		$tag = new Tag('a');
+		$tag->setAttribute('href', 'http://google.com');
+		$tag->removeAttribute('href');
+		$this->assertNull($tag->getAttribute('href')['value']);
+	}
+
+	public function testRemoveAllAttributes()
+	{
+		$attr = [
+				'class' => [
+						'value'       => 'clear-fix',
+						'doubleQuote' => true,
+				],
+		];
+
+		$tag = new Tag('a');
+		$tag->setAttribute('href', 'http://google.com');
+		$tag->setAttribute('class', $attr);
+		$tag->removeAllAttributes();
+		$this->assertEquals(0, count($tag->getAttributes()));
+	}
+
 	public function testSetAttributeNoArray()
 	{
 		$tag = new Tag('a');