GraphNode.php

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<?php
namespace Facebook\GraphNodes;
 
class GraphNode extends Collection
{
    protected static $graphObjectMap = [];
 
    public function __construct(array $data = [])
    {
        parent::__construct($this->castItems($data));
    }
 
    public function castItems(array $data)
    {
        $items = [];
 
        foreach ($data as $k => $v) {
            if ($this->shouldCastAsDateTime($k)
                && (is_numeric($v)
                    || $this->isIso8601DateString($v))
            ) {
                $items[$k] = $this->castToDateTime($v);
            } elseif ($k === 'birthday') {
                $items[$k] = $this->castToBirthday($v);
            } else {
                $items[$k] = $v;
            }
        }
 
        return $items;
    }
 
    public function uncastItems()
    {
        $items = $this->asArray();
 
        return array_map(function ($v) {
            if ($v instanceof \DateTime) {
                return $v->format(\DateTime::ISO8601);
            }
 
            return $v;
        }, $items);
    }
 
    public function asJson($options = 0)
    {
        return json_encode($this->uncastItems(), $options);
    }
 
    public function isIso8601DateString($string)
    {
        // This insane regex was yoinked from here:
        // http://www.pelagodesign.com/blog/2009/05/20/iso-8601-date-validation-that-doesnt-suck/
        // ...and I'm all like:
        // http://thecodinglove.com/post/95378251969/when-code-works-and-i-dont-know-why
        $crazyInsaneRegexThatSomehowDetectsIso8601 = '/^([\+-]?\d{4}(?!\d{2}\b))'
            . '((-?)((0[1-9]|1[0-2])(\3([12]\d|0[1-9]|3[01]))?'
            . '|W([0-4]\d|5[0-2])(-?[1-7])?|(00[1-9]|0[1-9]\d'
            . '|[12]\d{2}|3([0-5]\d|6[1-6])))([T\s]((([01]\d|2[0-3])'
            . '((:?)[0-5]\d)?|24\:?00)([\.,]\d+(?!:))?)?(\17[0-5]\d'
            . '([\.,]\d+)?)?([zZ]|([\+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?)?$/';
 
        return preg_match($crazyInsaneRegexThatSomehowDetectsIso8601, $string) === 1;
    }
 
    public function shouldCastAsDateTime($key)
    {
        return in_array($key, [
            'created_time',
            'updated_time',
            'start_time',
            'end_time',
            'backdated_time',
            'issued_at',
            'expires_at',
            'publish_time'
        ], true);
    }
 
    public function castToDateTime($value)
    {
        if (is_int($value)) {
            $dt = new \DateTime();
            $dt->setTimestamp($value);
        } else {
            $dt = new \DateTime($value);
        }
 
        return $dt;
    }
 
    public function castToBirthday($value)
    {
        return new Birthday($value);
    }
 
    public static function getObjectMap()
    {
        return static::$graphObjectMap;
    }
}