EthBlockParam.php

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<?php

namespace Ethereum\DataType;
use Math_BigInteger;

class EthBlockParam extends EthQ
{
    const TAGS = [
        "latest",
        "earliest",
        "pending",
    ];

    public function __construct($val = 'latest', array $params = [])
    {
        parent::__construct($val, $params);
    }

    public function validate($val, array $params)
    {
        $return = null;
        if ($this->isTag($val)) {
            $return = $val;
        } else {
            $return = parent::validate($val, $params);
        }

        if (is_null($return)) {
            throw new \InvalidArgumentException('No valid block param: ' . $val);
        }

        return $return;
    }

    public function val()
    {
        if ($this->isTag()) {
            return $this->value;
        } else {
            return $this->value->toString();
        }
    }

    protected function isTag($val = false)
    {
        if (!$val) {
            $val = $this->value;
        }

        return (!is_int($val) && in_array($val, self::TAGS));
    }

    public function hexVal()
    {
        if ($this->isTag()) {
            return $this->value;
        } else {
            $val = intval($this->value->toString());
            $val = ($val === 0) ? $val : $this->value->toHex(false);

            // Unpaded positive Hex value.
            return $this->ensureHexPrefix($val);
        }
    }

    protected function validateAddress($val, array $params)
    {
        return parent::validate($val, $params);
    }
}