[CAFFEINA] Exercise #1

test.tree.php

<?php

include "tree.php";

$x = new Tree();
$x->bacon = "Pancetta";
$x->pasta["fagioli"] = 3;

$y = clone $x;
$y->pasta = null;
$y->pasta->fagioli = [1];
$y->alpha->beta->gamma = "Carote";

var_dump($x,$y);
echo "\n$x\n$y";

tree.php

<?php

/**
 * Develop the class responsibile for the provided output in file : video.output.txt
 */

class Tree {}

video.output.txt

object(Tree)#1 (2) {
  ["bacon"]=>
  string(8) "Pancetta"
  ["pasta"]=>
  object(Tree)#2 (1) {
    ["fagioli"]=>
    int(3)
  }
}
object(Tree)#3 (3) {
  ["bacon"]=>
  string(8) "Pancetta"
  ["pasta"]=>
  object(Tree)#4 (1) {
    ["fagioli"]=>
    array(1) {
      [0]=>
      int(1)
    }
  }
  ["alpha"]=>
  object(Tree)#5 (1) {
    ["beta"]=>
    object(Tree)#6 (1) {
      ["gamma"]=>
      string(6) "Carote"
    }
  }
}

{"bacon":"Pancetta","pasta":{"fagioli":3}}
{"bacon":"Pancetta","pasta":{"fagioli":[1]},"alpha":{"beta":{"gamma":"Carote"}}}

<?php

class Tree implements ArrayAccess, JSONSerializable {
	private $data = null;
	private $value = null;
	public function __construct($value = null) {
		$this->data = [];
		$this->value = $value;
	}
	public function __set($key, $value) {
		$this->data[$key] = new Tree($value);
	}
	public function __get($key) {
		if (!isset($this->data[$key])) $this->data[$key] = new Tree();
		return $this->data[$key];
	}
	public function __clone() {
		$this->value = $this->value;
		$this->data = (array)(clone((object)$this->data));
	}
	public function offsetSet($offset, $value) {
		if (is_null($offset)) {
			$this->data[] = $value;
		} else {
			$this->data[$offset] = $value;
		}
	}
	public function offsetExists($offset) {
		return isset($this->data[$offset]);
	}
	public function offsetUnset($offset) {
		unset($this->data[$offset]);
	}
	public function offsetGet($offset) {
		return isset($this->data[$offset]) ? $this->data[$offset] : null;
	}
	public function __toString() {
		return json_encode($this);
	}
	public function __debugInfo() {
		return (array)$this->jsonSerialize();
	}
	public function jsonSerialize() {
		return !empty($this->data) ? ($this->data) : ($this->value);
	}
}

<?php

class Tree implements 
	\ArrayAccess,
	\JsonSerializable
{
	private $container = null;

	private $value = null;
	
	public function __construct($value = null) 
	{
		$this->container = [];

		$this->value = $value;
	}
	
	public function offsetSet($offset, $value) 
	{
		(empty($offset)) 
			? $this->container[] = $value
			: $this->container[$offset] = $value;
	}

	public function offsetExists($offset) 
	{
		return isset($this->container[$offset]);
	}

	public function offsetUnset($offset) 
	{
		unset($this->container[$offset]);
	}

	public function offsetGet($offset) 
	{
		return empty($this->container[$offset]) 
				? null 
				: $this->container[$offset];
	}

	public function __set($key, $value) 
	{
		$this->container[$key] = new self($value);
	}

	public function __get($key) 
	{
		return empty($this->container[$key])
				? $this->container[$key] = new self()
				: $this->container[$key];
	}
	
	public function __clone() 
	{
		$this->value = $this->value;

		$this->container = (array) (clone((object) $this->container));
	}

	public function __toString() 
	{
		return json_encode($this);
	}

	public function __debugInfo() 
	{
		return (array)$this->jsonSerialize();
	}

	public function jsonSerialize() 
	{
		return empty($this->container) 
				? $this->value  
				: $this->container;
	}
}