VariableBag.php

<?php

namespace EXSyst\Common;

class VariableBag
{
    private $data;
    private $lazy;

    public function __construct(array $data = [])
    {
        $this->data = $data;
        $this->lazy = [];
    }

    public function get($key)
    {
        if (isset($this->lazy[$key])) {
            $this->data[$key] = call_user_func($this->lazy[$key]);
            unset($this->lazy[$key]);
        }

        if (!isset($this->data[$key])) {
            throw new \LogicException(sprintf('The variable "%s" must be defined.', $key));
        }

        return $this->data[$key];
    }

    public function set($key, $value)
    {
        $this->data[$key] = $value;
        unset($this->lazy[$key]);

        return $this;
    }

    public function setLazy($key, $lazyValue, $service = null, $method = null)
    {
        if (isset($service)) {
            $container = $lazyValue;
            if (isset($method)) {
                $lazyValue = function () use ($container, $service, $method) {
                    return call_user_func($container->get($service), $method);
                };
            } else {
                $lazyValue = function () use ($container, $service) {
                    return $container->get($service);
                };
            }
        } elseif (isset($method)) {
            $lazyValue = [$lazyValue, $method];
        }

        if (!is_callable($lazyValue)) {
            throw new \LogicException('A "lazy value" must be a callable.');
        }

        $this->lazy[$key] = $lazyValue;
        unset($this->data[$key]);

        return $this;
    }

    public function has($key)
    {
        return isset($this->data[$key]) || isset($this->lazy[$key]);
    }

    public function remove($key)
    {
        unset($this->data[$key]);
        unset($this->lazy[$key]);

        return $this;
    }

    public function toArray()
    {
        if (!empty($this->lazy)) {
            foreach ($this->lazy as $key => $lazyValue) {
                $this->data[$key] = call_user_func($lazyValue);
            }
            $this->lazy = [];
        }

        return $this->data;
    }
}