Basic DOM

app/Dom/Document.php

@@ -11,4 +11,8 @@ namespace App\Dom;
  */
 class Document extends Node
 {
+	public function __construct()
+	{
+		$this->children = [];
+	}
 }

app/Dom/Node.php

@@ -9,7 +9,98 @@ namespace App\Dom;
  *
  * @author Adam Pippin <hello@adampippin.ca>
  */
-class Node
+class Node implements \ArrayAccess, \Iterator
 {
-	// parent, children, type
+	/** @var int */
+	private $_idx;
+
+	/** @var string */
+	protected $name;
+
+	/** @var Node */
+	protected $parent;
+
+	/** @var Node[] */
+	protected $children;
+
+	public function __construct(Node $parent, ?string $name)
+	{
+		$this->parent = $parent;
+		$this->children = [];
+		$this->name = $name;
+	}
+
+	public function setName(string $name)
+	{
+		$this->name = $name;
+	}
+
+	public function getName(): string
+	{
+		return $this->name;
+	}
+
+	public function getParent(): Node
+	{
+		return $this->parent;
+	}
+
+	public function getChildren(): array
+	{
+		return $this->children;
+	}
+
+	public function addChild(Node $child)
+	{
+		$this->children[] = $child;
+	}
+
+	// ArrayAccess
+
+	public function offsetExists($offset): bool
+	{
+		return isset($this->children[$offset]);
+	}
+
+	public function offsetGet($offset)
+	{
+		return $this->children[$offset];
+	}
+
+	public function offsetSet($offset, $value)
+	{
+		$this->children[$offset] = $value;
+	}
+
+	public function offsetUnset($offset)
+	{
+		unset($this->children[$offset]);
+	}
+
+	// Iterator
+
+	public function current()
+	{
+		return $this->children[$this->_idx];
+	}
+
+	public function key()
+	{
+		return $this->_idx;
+	}
+
+	public function next()
+	{
+		$this->_idx++;
+	}
+
+	public function rewind()
+	{
+		$this->_idx = 0;
+	}
+
+	public function valid()
+	{
+		return isset($this->children[$this->_idx]);
+	}
 }

app/Dom/NodeFunction.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Dom;
+
+/**
+ * Node in a document that represents a function call.
+ *
+ * @author Adam Pippin <hello@adampippin.ca>
+ */
+class NodeFunction extends Node
+{
+	public function __construct(Node $parent, ?string $name)
+	{
+		parent::__construct($parent, $name);
+	}
+}

app/Dom/NodeFunctionValue.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Dom;
+
+/**
+ * Node in a document that represents a function call with a value.
+ *
+ * @author Adam Pippin <hello@adampippin.ca>
+ */
+class NodeFunctionValue extends NodeFunction
+{
+	/** @var mixed */
+	protected $value;
+
+	public function __construct(Node $parent, ?string $name, $value)
+	{
+		parent::__construct($parent, $name);
+		$this->value = $value;
+	}
+
+	public function setValue($value)
+	{
+		$this->value = $value;
+	}
+
+	public function getValue()
+	{
+		return $this->value;
+	}
+}

app/Dom/NodeValue.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Dom;
+
+/**
+ * Node in a document that contains a value.
+ *
+ * @author Adam Pippin <hello@adampippin.ca>
+ */
+class NodeValue extends Node
+{
+	/** @var mixed */
+	protected $value;
+
+	public function __construct(Node $parent, ?string $name, $value)
+	{
+		parent::__construct($parent, $name);
+		$this->value = $value;
+	}
+
+	public function setValue($value)
+	{
+		$this->value = $value;
+	}
+
+	public function getValue()
+	{
+		return $this->value;
+	}
+}