paquettg / php-html-parser

src/PHPHtmlParser/Dom/Tag.php

Indentation +266 added lines, -266 removed lines

@@ -12,270 +12,270 @@
 class Tag
 {
 
-    /**
-     * The name of the tag.
-     *
-     * @var string
-     */
-    protected $name;
-
-    /**
-     * The attributes of the tag.
-     *
-     * @var array
-     */
-    protected $attr = [];
-
-    /**
-     * Is this tag self closing.
-     *
-     * @var bool
-     */
-    protected $selfClosing = false;
-
-    /**
-     * Tag noise
-     */
-    protected $noise = '';
-
-    /**
-     * The encoding class to... encode the tags
-     *
-     * @var mixed
-     */
-    protected $encode = null;
-
-    /**
-     * Sets up the tag with a name.
-     *
-     * @param $name
-     */
-    public function __construct($name)
-    {
-        $this->name = $name;
-    }
-
-    /**
-     * Magic method to get any of the attributes.
-     *
-     * @param string $key
-     * @return mixed
-     */
-    public function __get($key)
-    {
-        return $this->getAttribute($key);
-    }
-
-    /**
-     * Magic method to set any attribute.
-     *
-     * @param string $key
-     * @param mixed $value
-     */
-    public function __set($key, $value)
-    {
-        $this->setAttribute($key, $value);
-    }
-
-    /**
-     * Returns the name of this tag.
-     *
-     * @return string
-     */
-    public function name()
-    {
-        return $this->name;
-    }
-
-    /**
-     * Sets the tag to be self closing.
-     *
-     * @return $this
-     */
-    public function selfClosing()
-    {
-        $this->selfClosing = true;
-
-        return $this;
-    }
-
-    /**
-     * Checks if the tag is self closing.
-     *
-     * @return bool
-     */
-    public function isSelfClosing()
-    {
-        return $this->selfClosing;
-    }
-
-    /**
-     * Sets the encoding type to be used.
-     *
-     * @param Encode $encode
-     */
-    public function setEncoding(Encode $encode)
-    {
-        $this->encode = $encode;
-    }
-
-    /**
-     * Sets the noise for this tag (if any)
-     *
-     * @param $noise
-     * @return $this
-     */
-    public function noise($noise)
-    {
-        $this->noise = $noise;
-
-        return $this;
-    }
-
-    /**
-     * Set an attribute for this tag.
-     *
-     * @param string $key
-     * @param mixed $value
-     * @return $this
-     */
-    public function setAttribute($key, $value)
-    {
-        $key = strtolower($key);
-        if ( ! is_array($value)) {
-            $value = [
-                'value'       => $value,
-                'doubleQuote' => true,
-            ];
-        }
-        $this->attr[$key] = $value;
-
-        return $this;
-    }
-
-    /**
-     * Sets the attributes for this tag
-     *
-     * @param array $attr
-     * @return $this
-     */
-    public function setAttributes(array $attr)
-    {
-        foreach ($attr as $key => $value) {
-            $this->setAttribute($key, $value);
-        }
-
-        return $this;
-    }
-
-    /**
-     * Returns all attributes of this tag.
-     *
-     * @return array
-     */
-    public function getAttributes()
-    {
-        $return = [];
-        foreach ($this->attr as $attr => $info) {
-            $return[$attr] = $this->getAttribute($attr);
-        }
-
-        return $return;
-    }
-
-    /**
-     * Returns an attribute by the key
-     *
-     * @param string $key
-     * @return mixed
-     */
-    public function getAttribute($key)
-    {
-        if ( ! isset($this->attr[$key])) {
-            return null;
-        }
-        $value = $this->attr[$key]['value'];
-        if (is_string($value) AND ! is_null($this->encode)) {
-            // convert charset
-            $this->attr[$key]['value'] = $this->encode->convert($value);
-        }
-
-        return $this->attr[$key];
-    }
-
-    /**
-     * Removes an attribute for this tag
-     *
-     * @param string $key
-     * @return mixed
-     */
-    public function removeAttribute($key)
-    {
-        $key = strtolower($key);
-        unset($this->attr[$key]);
-
-        return $this;
-    }
-
-    /**
-     * Removes all attributes for this tag except the ones in the $keys array
-     *
-     * @param array $keys
-     * @return mixed
-     */
-    public function removeAttributes($keys)
-    {
-        $attributes = $this->getAttributes();
-        foreach($attributes as $key => $attribute) {
-            $key = strtolower($key);
-            if(!in_array($key, $keys)) {
-                unset($this->attr[$key]);
-            }
-        }
-
-        return $this;
-    }
-
-    /**
-     * Generates the opening tag for this object.
-     *
-     * @return string
-     */
-    public function makeOpeningTag()
-    {
-        $return = '<'.$this->name;
-
-        // add the attributes
-        foreach ($this->attr as $key => $info) {
-            $info = $this->getAttribute($key);
-            $val  = $info['value'];
-            if (is_null($val)) {
-                $return .= ' '.$key;
-            } elseif ($info['doubleQuote']) {
-                $return .= ' '.$key.'="'.$val.'"';
-            } else {
-                $return .= ' '.$key.'=\''.$val.'\'';
-            }
-        }
-
-        if ($this->selfClosing) {
-            return $return.' />';
-        } else {
-            return $return.'>';
-        }
-    }
-
-    /**
-     * Generates the closing tag for this object.
-     *
-     * @return string
-     */
-    public function makeClosingTag()
-    {
-        if ($this->selfClosing) {
-            return '';
-        }
-
-        return '</'.$this->name.'>';
-    }
+	/**
+	 * The name of the tag.
+	 *
+	 * @var string
+	 */
+	protected $name;
+
+	/**
+	 * The attributes of the tag.
+	 *
+	 * @var array
+	 */
+	protected $attr = [];
+
+	/**
+	 * Is this tag self closing.
+	 *
+	 * @var bool
+	 */
+	protected $selfClosing = false;
+
+	/**
+	 * Tag noise
+	 */
+	protected $noise = '';
+
+	/**
+	 * The encoding class to... encode the tags
+	 *
+	 * @var mixed
+	 */
+	protected $encode = null;
+
+	/**
+	 * Sets up the tag with a name.
+	 *
+	 * @param $name
+	 */
+	public function __construct($name)
+	{
+		$this->name = $name;
+	}
+
+	/**
+	 * Magic method to get any of the attributes.
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function __get($key)
+	{
+		return $this->getAttribute($key);
+	}
+
+	/**
+	 * Magic method to set any attribute.
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 */
+	public function __set($key, $value)
+	{
+		$this->setAttribute($key, $value);
+	}
+
+	/**
+	 * Returns the name of this tag.
+	 *
+	 * @return string
+	 */
+	public function name()
+	{
+		return $this->name;
+	}
+
+	/**
+	 * Sets the tag to be self closing.
+	 *
+	 * @return $this
+	 */
+	public function selfClosing()
+	{
+		$this->selfClosing = true;
+
+		return $this;
+	}
+
+	/**
+	 * Checks if the tag is self closing.
+	 *
+	 * @return bool
+	 */
+	public function isSelfClosing()
+	{
+		return $this->selfClosing;
+	}
+
+	/**
+	 * Sets the encoding type to be used.
+	 *
+	 * @param Encode $encode
+	 */
+	public function setEncoding(Encode $encode)
+	{
+		$this->encode = $encode;
+	}
+
+	/**
+	 * Sets the noise for this tag (if any)
+	 *
+	 * @param $noise
+	 * @return $this
+	 */
+	public function noise($noise)
+	{
+		$this->noise = $noise;
+
+		return $this;
+	}
+
+	/**
+	 * Set an attribute for this tag.
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @return $this
+	 */
+	public function setAttribute($key, $value)
+	{
+		$key = strtolower($key);
+		if ( ! is_array($value)) {
+			$value = [
+				'value'       => $value,
+				'doubleQuote' => true,
+			];
+		}
+		$this->attr[$key] = $value;
+
+		return $this;
+	}
+
+	/**
+	 * Sets the attributes for this tag
+	 *
+	 * @param array $attr
+	 * @return $this
+	 */
+	public function setAttributes(array $attr)
+	{
+		foreach ($attr as $key => $value) {
+			$this->setAttribute($key, $value);
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Returns all attributes of this tag.
+	 *
+	 * @return array
+	 */
+	public function getAttributes()
+	{
+		$return = [];
+		foreach ($this->attr as $attr => $info) {
+			$return[$attr] = $this->getAttribute($attr);
+		}
+
+		return $return;
+	}
+
+	/**
+	 * Returns an attribute by the key
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function getAttribute($key)
+	{
+		if ( ! isset($this->attr[$key])) {
+			return null;
+		}
+		$value = $this->attr[$key]['value'];
+		if (is_string($value) AND ! is_null($this->encode)) {
+			// convert charset
+			$this->attr[$key]['value'] = $this->encode->convert($value);
+		}
+
+		return $this->attr[$key];
+	}
+
+	/**
+	 * Removes an attribute for this tag
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function removeAttribute($key)
+	{
+		$key = strtolower($key);
+		unset($this->attr[$key]);
+
+		return $this;
+	}
+
+	/**
+	 * Removes all attributes for this tag except the ones in the $keys array
+	 *
+	 * @param array $keys
+	 * @return mixed
+	 */
+	public function removeAttributes($keys)
+	{
+		$attributes = $this->getAttributes();
+		foreach($attributes as $key => $attribute) {
+			$key = strtolower($key);
+			if(!in_array($key, $keys)) {
+				unset($this->attr[$key]);
+			}
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Generates the opening tag for this object.
+	 *
+	 * @return string
+	 */
+	public function makeOpeningTag()
+	{
+		$return = '<'.$this->name;
+
+		// add the attributes
+		foreach ($this->attr as $key => $info) {
+			$info = $this->getAttribute($key);
+			$val  = $info['value'];
+			if (is_null($val)) {
+				$return .= ' '.$key;
+			} elseif ($info['doubleQuote']) {
+				$return .= ' '.$key.'="'.$val.'"';
+			} else {
+				$return .= ' '.$key.'=\''.$val.'\'';
+			}
+		}
+
+		if ($this->selfClosing) {
+			return $return.' />';
+		} else {
+			return $return.'>';
+		}
+	}
+
+	/**
+	 * Generates the closing tag for this object.
+	 *
+	 * @return string
+	 */
+	public function makeClosingTag()
+	{
+		if ($this->selfClosing) {
+			return '';
+		}
+
+		return '</'.$this->name.'>';
+	}
 }

Spacing +2 added lines, -2 removed lines

@@ -226,9 +226,9 @@
     public function removeAttributes($keys)
     {
         $attributes = $this->getAttributes();
-        foreach($attributes as $key => $attribute) {
+        foreach ($attributes as $key => $attribute) {
             $key = strtolower($key);
-            if(!in_array($key, $keys)) {
+            if ( ! in_array($key, $keys)) {
                 unset($this->attr[$key]);
             }
         }

src/PHPHtmlParser/Dom/AbstractNode.php

Indentation +713 added lines, -713 removed lines

@@ -17,717 +17,717 @@
 abstract class AbstractNode
 {
 
-    /**
-     * Contains the tag name/type
-     *
-     * @var \PHPHtmlParser\Dom\Tag
-     */
-    protected $tag;
-
-    /**
-     * Contains a list of attributes on this tag.
-     *
-     * @var array
-     */
-    protected $attr = [];
-
-    /**
-     * An array of all the children.
-     *
-     * @var array
-     */
-    protected $children = [];
-
-    /**
-     * Contains the parent Node.
-     *
-     * @var AbstractNode
-     */
-    protected $parent = null;
-
-    /**
-     * The unique id of the class. Given by PHP.
-     *
-     * @var string
-     */
-    protected $id;
-
-    /**
-     * The encoding class used to encode strings.
-     *
-     * @var mixed
-     */
-    protected $encode;
-
-    /**
-     * Creates a unique spl hash for this node.
-     */
-    public function __construct()
-    {
-        $this->id = spl_object_hash($this);
-    }
-
-    /**
-     * Magic get method for attributes and certain methods.
-     *
-     * @param string $key
-     * @return mixed
-     */
-    public function __get($key)
-    {
-        // check attribute first
-        if ( ! is_null($this->getAttribute($key))) {
-            return $this->getAttribute($key);
-        }
-        switch (strtolower($key)) {
-            case 'outerhtml':
-                return $this->outerHtml();
-            case 'innerhtml':
-                return $this->innerHtml();
-            case 'text':
-                return $this->text();
-        }
-
-        return null;
-    }
-
-    /**
-     * Attempts to clear out any object references.
-     */
-    public function __destruct()
-    {
-        $this->tag      = null;
-        $this->attr     = [];
-        $this->parent   = null;
-        $this->children = [];
-    }
-
-    /**
-     * Simply calls the outer text method.
-     *
-     * @return string
-     */
-    public function __toString()
-    {
-        return $this->outerHtml();
-    }
-
-    /**
-     * Returns the id of this object.
-     */
-    public function id()
-    {
-        return $this->id;
-    }
-
-    /**
-     * Returns the parent of node.
-     *
-     * @return AbstractNode
-     */
-    public function getParent()
-    {
-        return $this->parent;
-    }
-
-    /**
-     * Sets the parent node.
-     *
-     * @param AbstractNode $parent
-     * @return $this
-     * @throws CircularException
-     */
-    public function setParent(AbstractNode $parent)
-    {
-        // check integrity
-        if ($this->isDescendant($parent->id())) {
-            throw new CircularException('Can not add descendant "'.$parent->id().'" as my parent.');
-        }
-
-        // remove from old parent
-        if ( ! is_null($this->parent)) {
-            if ($this->parent->id() == $parent->id()) {
-                // already the parent
-                return $this;
-            }
-
-            $this->parent->removeChild($this->id);
-        }
-
-        $this->parent = $parent;
-
-        // assign child to parent
-        $this->parent->addChild($this);
-
-        //clear any cache
-        $this->clear();
-
-        return $this;
-    }
-
-    /**
-     * Sets the encoding class to this node and propagates it
-     * to all its children.
-     *
-     * @param Encode $encode
-     */
-    public function propagateEncoding(Encode $encode)
-    {
-        $this->encode = $encode;
-        $this->tag->setEncoding($encode);
-        // check children
-        foreach ($this->children as $id => $child) {
-            /** @var AbstractNode $node */
-            $node = $child['node'];
-            $node->propagateEncoding($encode);
-        }
-    }
-
-    /**
-     * Checks if this node has children.
-     *
-     * @return bool
-     */
-    public function hasChildren()
-    {
-        return ! empty($this->children);
-    }
-
-    /**
-     * Returns the child by id.
-     *
-     * @param int $id
-     * @return AbstractNode
-     * @throws ChildNotFoundException
-     */
-    public function getChild($id)
-    {
-        if ( ! isset($this->children[$id])) {
-            throw new ChildNotFoundException("Child '$id' not found in this node.");
-        }
-
-        return $this->children[$id]['node'];
-    }
-
-    /**
-     * Returns a new array of child nodes
-     *
-     * @return array
-     */
-    public function getChildren()
-    {
-        $nodes = [];
-        try {
-            $child = $this->firstChild();
-            do {
-                $nodes[] = $child;
-                $child   = $this->nextChild($child->id());
-            } while ( ! is_null($child));
-        } catch (ChildNotFoundException $e) {
-            // we are done looking for children
-        }
-
-        return $nodes;
-    }
-
-    /**
-     * Counts children
-     *
-     * @return int
-     */
-    public function countChildren()
-    {
-        return count($this->children);
-    }
-
-    /**
-     * Adds a child node to this node and returns the id of the child for this
-     * parent.
-     *
-     * @param AbstractNode $child
-     * @return bool
-     * @throws CircularException
-     */
-    public function addChild(AbstractNode $child)
-    {
-        $key = null;
-
-        // check integrity
-        if ($this->isAncestor($child->id())) {
-            throw new CircularException('Can not add child. It is my ancestor.');
-        }
-
-        // check if child is itself
-        if ($child->id() == $this->id) {
-            throw new CircularException('Can not set itself as a child.');
-        }
-
-        if ($this->hasChildren()) {
-            if (isset($this->children[$child->id()])) {
-                // we already have this child
-                return false;
-            }
-            $sibling                      = $this->lastChild();
-            $key                          = $sibling->id();
-            $this->children[$key]['next'] = $child->id();
-        }
-
-        // add the child
-        $this->children[$child->id()] = [
-            'node' => $child,
-            'next' => null,
-            'prev' => $key,
-        ];
-
-        // tell child I am the new parent
-        $child->setParent($this);
-
-        //clear any cache
-        $this->clear();
-
-        return true;
-    }
-
-    /**
-     * Removes the child by id.
-     *
-     * @param int $id
-     * @return $this
-     */
-    public function removeChild($id)
-    {
-        if ( ! isset($this->children[$id])) {
-            return $this;
-        }
-
-        // handle moving next and previous assignments.
-        $next = $this->children[$id]['next'];
-        $prev = $this->children[$id]['prev'];
-        if ( ! is_null($next)) {
-            $this->children[$next]['prev'] = $prev;
-        }
-        if ( ! is_null($prev)) {
-            $this->children[$prev]['next'] = $next;
-        }
-
-        // remove the child
-        unset($this->children[$id]);
-
-        //clear any cache
-        $this->clear();
-
-        return $this;
-    }
-
-    /**
-     * Attempts to get the next child.
-     *
-     * @param int $id
-     * @return AbstractNode
-     * @uses $this->getChild()
-     */
-    public function nextChild($id)
-    {
-        $child = $this->getChild($id);
-        $next  = $this->children[$child->id()]['next'];
-
-        return $this->getChild($next);
-    }
-
-    /**
-     * Attempts to get the previous child.
-     *
-     * @param int $id
-     * @return AbstractNode
-     * @uses $this->getChild()
-     */
-    public function previousChild($id)
-    {
-        $child = $this->getchild($id);
-        $next  = $this->children[$child->id()]['prev'];
-
-        return $this->getChild($next);
-    }
-
-    /**
-     * Checks if the given node id is a child of the
-     * current node.
-     *
-     * @param int $id
-     * @return bool
-     */
-    public function isChild($id)
-    {
-        foreach ($this->children as $childId => $child) {
-            if ($id == $childId) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    /**
-     * Checks if the given node id is a descendant of the
-     * current node.
-     *
-     * @param int $id
-     * @return bool
-     */
-    public function isDescendant($id)
-    {
-        if ($this->isChild($id)) {
-            return true;
-        }
-
-        foreach ($this->children as $childId => $child) {
-            /** @var AbstractNode $node */
-            $node = $child['node'];
-            if ($node->hasChildren() &&
-                $node->isDescendant($id)
-            ) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    /**
-     * Checks if the given node id is an ancestor of
-     * the current node.
-     *
-     * @param int $id
-     * @return bool
-     */
-    public function isAncestor($id)
-    {
-        if ( ! is_null($this->parent)) {
-            if ($this->parent->id() == $id) {
-                return true;
-            }
-
-            return $this->parent->isAncestor($id);
-        }
-
-        return false;
-    }
-
-    /**
-     * Attempts to get an ancestor node by the given id.
-     *
-     * @param int $id
-     * @return null|AbstractNode
-     */
-    public function getAncestor($id)
-    {
-        if ( ! is_null($this->parent)) {
-            if ($this->parent->id() == $id) {
-                return $this->parent;
-            }
-
-            return $this->parent->getAncestor($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.
-     *
-     * @return AbstractNode
-     * @throws ParentNotFoundException
-     */
-    public function nextSibling()
-    {
-        if (is_null($this->parent)) {
-            throw new ParentNotFoundException('Parent is not set for this node.');
-        }
-
-        return $this->parent->nextChild($this->id);
-    }
-
-    /**
-     * Attempts to get the previous sibling
-     *
-     * @return AbstractNode
-     * @throws ParentNotFoundException
-     */
-    public function previousSibling()
-    {
-        if (is_null($this->parent)) {
-            throw new ParentNotFoundException('Parent is not set for this node.');
-        }
-
-        return $this->parent->previousChild($this->id);
-    }
-
-    /**
-     * Gets the tag object of this node.
-     *
-     * @return Tag
-     */
-    public function getTag()
-    {
-        return $this->tag;
-    }
-
-    /**
-     * A wrapper method that simply calls the getAttribute method
-     * on the tag of this node.
-     *
-     * @return array
-     */
-    public function getAttributes()
-    {
-        $attributes = $this->tag->getAttributes();
-        foreach ($attributes as $name => $info) {
-            $attributes[$name] = $info['value'];
-        }
-
-        return $attributes;
-    }
-
-    /**
-     * A wrapper method that simply calls the getAttribute method
-     * on the tag of this node.
-     *
-     * @param string $key
-     * @return mixed
-     */
-    public function getAttribute($key)
-    {
-        $attribute = $this->tag->getAttribute($key);
-        if ( ! is_null($attribute)) {
-            $attribute = $attribute['value'];
-        }
-
-        return $attribute;
-    }
-
-    /**
-     * A wrapper method that simply calls the setAttribute method
-     * on the tag of this node.
-     *
-     * @param string $key
-     * @param string $value
-     * @return $this
-     */
-    public function setAttribute($key, $value)
-    {
-        $this->tag->setAttribute($key, $value);
-
-        return $this;
-    }
-
-    /**
-     * A wrapper method that simply calls the removeAttribute method
-     * on the tag of this node.
-     *
-     * @param string $key
-     * @return $this
-     */
-    public function removeAttribute($key)
-    {
-        $this->tag->removeAttribute($key);
-
-        return $this;
-    }
-
-    /**
-     * A wrapper method that simply calls the removeAttributes method
-     * on the tag of this node.
-     *
-     * @param array $keys
-     * @return $this
-     */
-    public function removeAttributes($keys)
-    {
-        $this->tag->removeAttributes($keys);
-
-        return $this;
-    }
-
-    /**
-     * Function to locate a specific ancestor tag in the path to the root.
-     *
-     * @param  string $tag
-     * @return AbstractNode
-     * @throws ParentNotFoundException
-     */
-    public function ancestorByTag($tag)
-    {
-        // Start by including ourselves in the comparison.
-        $node = $this;
-
-        while ( ! is_null($node)) {
-            if ($node->tag->name() == $tag) {
-                return $node;
-            }
-
-            $node = $node->getParent();
-        }
-
-        throw new ParentNotFoundException('Could not find an ancestor with "'.$tag.'" tag');
-    }
-
-    /**
-     * Find elements by css selector
-     *
-     * @param string $selector
-     * @param int $nth
-     * @return array|AbstractNode
-     */
-    public function find($selector, $nth = null)
-    {
-        $selector = new Selector($selector);
-        $nodes    = $selector->find($this);
-
-        if ( ! is_null($nth)) {
-            // return nth-element or array
-            if (isset($nodes[$nth])) {
-                return $nodes[$nth];
-            }
-
-            return null;
-        }
-
-        return $nodes;
-    }
-
-    /**
-     * Function to try a few tricks to determine the displayed size of an img on the page.
-     * NOTE: This will ONLY work on an IMG tag. Returns FALSE on all other tag types.
-     *
-     * Future enhancement:
-     * Look in the tag to see if there is a class or id specified that has a height or width attribute to it.
-     *
-     * Far future enhancement
-     * Look at all the parent tags of this image to see if they specify a class or id that has an img selector that specifies a height or width
-     * Note that in this case, the class or id will have the img sub-selector for it to apply to the image.
-     *
-     * ridiculously far future development
-     * If the class or id is specified in a SEPARATE css file that's not on the page, go get it and do what we were just doing for the ones on the page.
-     *
-     * @author John Schlick
-     * @return array an array containing the 'height' and 'width' of the image on the page or -1 if we can't figure it out.
-     */
-    public function get_display_size()
-    {
-        $width  = -1;
-        $height = -1;
-
-        if ($this->tag->name() != 'img') {
-            return false;
-        }
-
-        // See if there is a height or width attribute in the tag itself.
-        if ( ! is_null($this->tag->getAttribute('width'))) {
-            $width = $this->tag->getAttribute('width');
-        }
-
-        if ( ! is_null($this->tag->getAttribute('height'))) {
-            $height = $this->tag->getAttribute('height');
-        }
-
-        // Now look for an inline style.
-        if ( ! is_null($this->tag->getAttribute('style'))) {
-            // Thanks to user 'gnarf' from stackoverflow for this regular expression.
-            $attributes = [];
-            preg_match_all("/([\w-]+)\s*:\s*([^;]+)\s*;?/", $this->tag->getAttribute('style'), $matches,
-                PREG_SET_ORDER);
-            foreach ($matches as $match) {
-                $attributes[$match[1]] = $match[2];
-            }
-
-            // If there is a width in the style attributes:
-            if (isset($attributes['width']) and $width == -1) {
-                // check that the last two characters are px (pixels)
-                if (strtolower(substr($attributes['width'], -2)) == 'px') {
-                    $proposed_width = substr($attributes['width'], 0, -2);
-                    // Now make sure that it's an integer and not something stupid.
-                    if (filter_var($proposed_width, FILTER_VALIDATE_INT)) {
-                        $width = $proposed_width;
-                    }
-                }
-            }
-
-            // If there is a width in the style attributes:
-            if (isset($attributes['height']) and $height == -1) {
-                // check that the last two characters are px (pixels)
-                if (strtolower(substr($attributes['height'], -2)) == 'px') {
-                    $proposed_height = substr($attributes['height'], 0, -2);
-                    // Now make sure that it's an integer and not something stupid.
-                    if (filter_var($proposed_height, FILTER_VALIDATE_INT)) {
-                        $height = $proposed_height;
-                    }
-                }
-            }
-
-        }
-
-        $result = [
-            'height' => $height,
-            'width'  => $width,
-        ];
-
-        return $result;
-    }
-
-    /**
-     * Gets the inner html of this node.
-     *
-     * @return string
-     */
-    abstract public function innerHtml();
-
-    /**
-     * Gets the html of this node, including it's own
-     * tag.
-     *
-     * @return string
-     */
-    abstract public function outerHtml();
-
-    /**
-     * Gets the text of this node (if there is any text).
-     *
-     * @return string
-     */
-    abstract public function text();
-
-    /**
-     * Call this when something in the node tree has changed. Like a child has been added
-     * or a parent has been changed.
-     *
-     * @return void
-     */
-    abstract protected function clear();
+	/**
+	 * Contains the tag name/type
+	 *
+	 * @var \PHPHtmlParser\Dom\Tag
+	 */
+	protected $tag;
+
+	/**
+	 * Contains a list of attributes on this tag.
+	 *
+	 * @var array
+	 */
+	protected $attr = [];
+
+	/**
+	 * An array of all the children.
+	 *
+	 * @var array
+	 */
+	protected $children = [];
+
+	/**
+	 * Contains the parent Node.
+	 *
+	 * @var AbstractNode
+	 */
+	protected $parent = null;
+
+	/**
+	 * The unique id of the class. Given by PHP.
+	 *
+	 * @var string
+	 */
+	protected $id;
+
+	/**
+	 * The encoding class used to encode strings.
+	 *
+	 * @var mixed
+	 */
+	protected $encode;
+
+	/**
+	 * Creates a unique spl hash for this node.
+	 */
+	public function __construct()
+	{
+		$this->id = spl_object_hash($this);
+	}
+
+	/**
+	 * Magic get method for attributes and certain methods.
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function __get($key)
+	{
+		// check attribute first
+		if ( ! is_null($this->getAttribute($key))) {
+			return $this->getAttribute($key);
+		}
+		switch (strtolower($key)) {
+			case 'outerhtml':
+				return $this->outerHtml();
+			case 'innerhtml':
+				return $this->innerHtml();
+			case 'text':
+				return $this->text();
+		}
+
+		return null;
+	}
+
+	/**
+	 * Attempts to clear out any object references.
+	 */
+	public function __destruct()
+	{
+		$this->tag      = null;
+		$this->attr     = [];
+		$this->parent   = null;
+		$this->children = [];
+	}
+
+	/**
+	 * Simply calls the outer text method.
+	 *
+	 * @return string
+	 */
+	public function __toString()
+	{
+		return $this->outerHtml();
+	}
+
+	/**
+	 * Returns the id of this object.
+	 */
+	public function id()
+	{
+		return $this->id;
+	}
+
+	/**
+	 * Returns the parent of node.
+	 *
+	 * @return AbstractNode
+	 */
+	public function getParent()
+	{
+		return $this->parent;
+	}
+
+	/**
+	 * Sets the parent node.
+	 *
+	 * @param AbstractNode $parent
+	 * @return $this
+	 * @throws CircularException
+	 */
+	public function setParent(AbstractNode $parent)
+	{
+		// check integrity
+		if ($this->isDescendant($parent->id())) {
+			throw new CircularException('Can not add descendant "'.$parent->id().'" as my parent.');
+		}
+
+		// remove from old parent
+		if ( ! is_null($this->parent)) {
+			if ($this->parent->id() == $parent->id()) {
+				// already the parent
+				return $this;
+			}
+
+			$this->parent->removeChild($this->id);
+		}
+
+		$this->parent = $parent;
+
+		// assign child to parent
+		$this->parent->addChild($this);
+
+		//clear any cache
+		$this->clear();
+
+		return $this;
+	}
+
+	/**
+	 * Sets the encoding class to this node and propagates it
+	 * to all its children.
+	 *
+	 * @param Encode $encode
+	 */
+	public function propagateEncoding(Encode $encode)
+	{
+		$this->encode = $encode;
+		$this->tag->setEncoding($encode);
+		// check children
+		foreach ($this->children as $id => $child) {
+			/** @var AbstractNode $node */
+			$node = $child['node'];
+			$node->propagateEncoding($encode);
+		}
+	}
+
+	/**
+	 * Checks if this node has children.
+	 *
+	 * @return bool
+	 */
+	public function hasChildren()
+	{
+		return ! empty($this->children);
+	}
+
+	/**
+	 * Returns the child by id.
+	 *
+	 * @param int $id
+	 * @return AbstractNode
+	 * @throws ChildNotFoundException
+	 */
+	public function getChild($id)
+	{
+		if ( ! isset($this->children[$id])) {
+			throw new ChildNotFoundException("Child '$id' not found in this node.");
+		}
+
+		return $this->children[$id]['node'];
+	}
+
+	/**
+	 * Returns a new array of child nodes
+	 *
+	 * @return array
+	 */
+	public function getChildren()
+	{
+		$nodes = [];
+		try {
+			$child = $this->firstChild();
+			do {
+				$nodes[] = $child;
+				$child   = $this->nextChild($child->id());
+			} while ( ! is_null($child));
+		} catch (ChildNotFoundException $e) {
+			// we are done looking for children
+		}
+
+		return $nodes;
+	}
+
+	/**
+	 * Counts children
+	 *
+	 * @return int
+	 */
+	public function countChildren()
+	{
+		return count($this->children);
+	}
+
+	/**
+	 * Adds a child node to this node and returns the id of the child for this
+	 * parent.
+	 *
+	 * @param AbstractNode $child
+	 * @return bool
+	 * @throws CircularException
+	 */
+	public function addChild(AbstractNode $child)
+	{
+		$key = null;
+
+		// check integrity
+		if ($this->isAncestor($child->id())) {
+			throw new CircularException('Can not add child. It is my ancestor.');
+		}
+
+		// check if child is itself
+		if ($child->id() == $this->id) {
+			throw new CircularException('Can not set itself as a child.');
+		}
+
+		if ($this->hasChildren()) {
+			if (isset($this->children[$child->id()])) {
+				// we already have this child
+				return false;
+			}
+			$sibling                      = $this->lastChild();
+			$key                          = $sibling->id();
+			$this->children[$key]['next'] = $child->id();
+		}
+
+		// add the child
+		$this->children[$child->id()] = [
+			'node' => $child,
+			'next' => null,
+			'prev' => $key,
+		];
+
+		// tell child I am the new parent
+		$child->setParent($this);
+
+		//clear any cache
+		$this->clear();
+
+		return true;
+	}
+
+	/**
+	 * Removes the child by id.
+	 *
+	 * @param int $id
+	 * @return $this
+	 */
+	public function removeChild($id)
+	{
+		if ( ! isset($this->children[$id])) {
+			return $this;
+		}
+
+		// handle moving next and previous assignments.
+		$next = $this->children[$id]['next'];
+		$prev = $this->children[$id]['prev'];
+		if ( ! is_null($next)) {
+			$this->children[$next]['prev'] = $prev;
+		}
+		if ( ! is_null($prev)) {
+			$this->children[$prev]['next'] = $next;
+		}
+
+		// remove the child
+		unset($this->children[$id]);
+
+		//clear any cache
+		$this->clear();
+
+		return $this;
+	}
+
+	/**
+	 * Attempts to get the next child.
+	 *
+	 * @param int $id
+	 * @return AbstractNode
+	 * @uses $this->getChild()
+	 */
+	public function nextChild($id)
+	{
+		$child = $this->getChild($id);
+		$next  = $this->children[$child->id()]['next'];
+
+		return $this->getChild($next);
+	}
+
+	/**
+	 * Attempts to get the previous child.
+	 *
+	 * @param int $id
+	 * @return AbstractNode
+	 * @uses $this->getChild()
+	 */
+	public function previousChild($id)
+	{
+		$child = $this->getchild($id);
+		$next  = $this->children[$child->id()]['prev'];
+
+		return $this->getChild($next);
+	}
+
+	/**
+	 * Checks if the given node id is a child of the
+	 * current node.
+	 *
+	 * @param int $id
+	 * @return bool
+	 */
+	public function isChild($id)
+	{
+		foreach ($this->children as $childId => $child) {
+			if ($id == $childId) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Checks if the given node id is a descendant of the
+	 * current node.
+	 *
+	 * @param int $id
+	 * @return bool
+	 */
+	public function isDescendant($id)
+	{
+		if ($this->isChild($id)) {
+			return true;
+		}
+
+		foreach ($this->children as $childId => $child) {
+			/** @var AbstractNode $node */
+			$node = $child['node'];
+			if ($node->hasChildren() &&
+				$node->isDescendant($id)
+			) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Checks if the given node id is an ancestor of
+	 * the current node.
+	 *
+	 * @param int $id
+	 * @return bool
+	 */
+	public function isAncestor($id)
+	{
+		if ( ! is_null($this->parent)) {
+			if ($this->parent->id() == $id) {
+				return true;
+			}
+
+			return $this->parent->isAncestor($id);
+		}
+
+		return false;
+	}
+
+	/**
+	 * Attempts to get an ancestor node by the given id.
+	 *
+	 * @param int $id
+	 * @return null|AbstractNode
+	 */
+	public function getAncestor($id)
+	{
+		if ( ! is_null($this->parent)) {
+			if ($this->parent->id() == $id) {
+				return $this->parent;
+			}
+
+			return $this->parent->getAncestor($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.
+	 *
+	 * @return AbstractNode
+	 * @throws ParentNotFoundException
+	 */
+	public function nextSibling()
+	{
+		if (is_null($this->parent)) {
+			throw new ParentNotFoundException('Parent is not set for this node.');
+		}
+
+		return $this->parent->nextChild($this->id);
+	}
+
+	/**
+	 * Attempts to get the previous sibling
+	 *
+	 * @return AbstractNode
+	 * @throws ParentNotFoundException
+	 */
+	public function previousSibling()
+	{
+		if (is_null($this->parent)) {
+			throw new ParentNotFoundException('Parent is not set for this node.');
+		}
+
+		return $this->parent->previousChild($this->id);
+	}
+
+	/**
+	 * Gets the tag object of this node.
+	 *
+	 * @return Tag
+	 */
+	public function getTag()
+	{
+		return $this->tag;
+	}
+
+	/**
+	 * A wrapper method that simply calls the getAttribute method
+	 * on the tag of this node.
+	 *
+	 * @return array
+	 */
+	public function getAttributes()
+	{
+		$attributes = $this->tag->getAttributes();
+		foreach ($attributes as $name => $info) {
+			$attributes[$name] = $info['value'];
+		}
+
+		return $attributes;
+	}
+
+	/**
+	 * A wrapper method that simply calls the getAttribute method
+	 * on the tag of this node.
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function getAttribute($key)
+	{
+		$attribute = $this->tag->getAttribute($key);
+		if ( ! is_null($attribute)) {
+			$attribute = $attribute['value'];
+		}
+
+		return $attribute;
+	}
+
+	/**
+	 * A wrapper method that simply calls the setAttribute method
+	 * on the tag of this node.
+	 *
+	 * @param string $key
+	 * @param string $value
+	 * @return $this
+	 */
+	public function setAttribute($key, $value)
+	{
+		$this->tag->setAttribute($key, $value);
+
+		return $this;
+	}
+
+	/**
+	 * A wrapper method that simply calls the removeAttribute method
+	 * on the tag of this node.
+	 *
+	 * @param string $key
+	 * @return $this
+	 */
+	public function removeAttribute($key)
+	{
+		$this->tag->removeAttribute($key);
+
+		return $this;
+	}
+
+	/**
+	 * A wrapper method that simply calls the removeAttributes method
+	 * on the tag of this node.
+	 *
+	 * @param array $keys
+	 * @return $this
+	 */
+	public function removeAttributes($keys)
+	{
+		$this->tag->removeAttributes($keys);
+
+		return $this;
+	}
+
+	/**
+	 * Function to locate a specific ancestor tag in the path to the root.
+	 *
+	 * @param  string $tag
+	 * @return AbstractNode
+	 * @throws ParentNotFoundException
+	 */
+	public function ancestorByTag($tag)
+	{
+		// Start by including ourselves in the comparison.
+		$node = $this;
+
+		while ( ! is_null($node)) {
+			if ($node->tag->name() == $tag) {
+				return $node;
+			}
+
+			$node = $node->getParent();
+		}
+
+		throw new ParentNotFoundException('Could not find an ancestor with "'.$tag.'" tag');
+	}
+
+	/**
+	 * Find elements by css selector
+	 *
+	 * @param string $selector
+	 * @param int $nth
+	 * @return array|AbstractNode
+	 */
+	public function find($selector, $nth = null)
+	{
+		$selector = new Selector($selector);
+		$nodes    = $selector->find($this);
+
+		if ( ! is_null($nth)) {
+			// return nth-element or array
+			if (isset($nodes[$nth])) {
+				return $nodes[$nth];
+			}
+
+			return null;
+		}
+
+		return $nodes;
+	}
+
+	/**
+	 * Function to try a few tricks to determine the displayed size of an img on the page.
+	 * NOTE: This will ONLY work on an IMG tag. Returns FALSE on all other tag types.
+	 *
+	 * Future enhancement:
+	 * Look in the tag to see if there is a class or id specified that has a height or width attribute to it.
+	 *
+	 * Far future enhancement
+	 * Look at all the parent tags of this image to see if they specify a class or id that has an img selector that specifies a height or width
+	 * Note that in this case, the class or id will have the img sub-selector for it to apply to the image.
+	 *
+	 * ridiculously far future development
+	 * If the class or id is specified in a SEPARATE css file that's not on the page, go get it and do what we were just doing for the ones on the page.
+	 *
+	 * @author John Schlick
+	 * @return array an array containing the 'height' and 'width' of the image on the page or -1 if we can't figure it out.
+	 */
+	public function get_display_size()
+	{
+		$width  = -1;
+		$height = -1;
+
+		if ($this->tag->name() != 'img') {
+			return false;
+		}
+
+		// See if there is a height or width attribute in the tag itself.
+		if ( ! is_null($this->tag->getAttribute('width'))) {
+			$width = $this->tag->getAttribute('width');
+		}
+
+		if ( ! is_null($this->tag->getAttribute('height'))) {
+			$height = $this->tag->getAttribute('height');
+		}
+
+		// Now look for an inline style.
+		if ( ! is_null($this->tag->getAttribute('style'))) {
+			// Thanks to user 'gnarf' from stackoverflow for this regular expression.
+			$attributes = [];
+			preg_match_all("/([\w-]+)\s*:\s*([^;]+)\s*;?/", $this->tag->getAttribute('style'), $matches,
+				PREG_SET_ORDER);
+			foreach ($matches as $match) {
+				$attributes[$match[1]] = $match[2];
+			}
+
+			// If there is a width in the style attributes:
+			if (isset($attributes['width']) and $width == -1) {
+				// check that the last two characters are px (pixels)
+				if (strtolower(substr($attributes['width'], -2)) == 'px') {
+					$proposed_width = substr($attributes['width'], 0, -2);
+					// Now make sure that it's an integer and not something stupid.
+					if (filter_var($proposed_width, FILTER_VALIDATE_INT)) {
+						$width = $proposed_width;
+					}
+				}
+			}
+
+			// If there is a width in the style attributes:
+			if (isset($attributes['height']) and $height == -1) {
+				// check that the last two characters are px (pixels)
+				if (strtolower(substr($attributes['height'], -2)) == 'px') {
+					$proposed_height = substr($attributes['height'], 0, -2);
+					// Now make sure that it's an integer and not something stupid.
+					if (filter_var($proposed_height, FILTER_VALIDATE_INT)) {
+						$height = $proposed_height;
+					}
+				}
+			}
+
+		}
+
+		$result = [
+			'height' => $height,
+			'width'  => $width,
+		];
+
+		return $result;
+	}
+
+	/**
+	 * Gets the inner html of this node.
+	 *
+	 * @return string
+	 */
+	abstract public function innerHtml();
+
+	/**
+	 * Gets the html of this node, including it's own
+	 * tag.
+	 *
+	 * @return string
+	 */
+	abstract public function outerHtml();
+
+	/**
+	 * Gets the text of this node (if there is any text).
+	 *
+	 * @return string
+	 */
+	abstract public function text();
+
+	/**
+	 * Call this when something in the node tree has changed. Like a child has been added
+	 * or a parent has been changed.
+	 *
+	 * @return void
+	 */
+	abstract protected function clear();
 }