You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.5 KiB
75 lines
1.5 KiB
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
namespace App\Cfnpp\Expression\Token;
|
|
|
|
use App\Cfnpp\Expression\Token;
|
|
use App\Cfnpp\Expression\TokenLiteral;
|
|
|
|
/**
|
|
* A boolean literal (true/false).
|
|
*
|
|
* @author Adam Pippin <hello@adampippin.ca>
|
|
*/
|
|
class BooleanLiteral extends TokenLiteral
|
|
{
|
|
/**
|
|
* Value of this literal.
|
|
* @var bool
|
|
*/
|
|
protected $value;
|
|
|
|
/**
|
|
* New boolean literal.
|
|
*
|
|
* @param bool $value
|
|
*/
|
|
public function __construct(bool $value)
|
|
{
|
|
$this->value = $value;
|
|
}
|
|
|
|
/**
|
|
* Get the value of this literal.
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function getValue(): bool
|
|
{
|
|
return $this->value;
|
|
}
|
|
|
|
public static function isToken(string $stream): bool
|
|
{
|
|
return
|
|
(strlen($stream) >= 4 && strtolower(substr($stream, 0, 4)) == 'true') ||
|
|
(strlen($stream) >= 5 && strtolower(substr($stream, 0, 5)) == 'false');
|
|
}
|
|
|
|
public static function getToken(string &$stream): Token
|
|
{
|
|
if (strlen($stream) >= 4 && strtolower(substr($stream, 0, 4)) == 'true')
|
|
{
|
|
$stream = substr($stream, 4);
|
|
return new BooleanLiteral(true);
|
|
}
|
|
elseif (strlen($stream) >= 5 && strtolower(substr($stream, 0, 5)) == 'false')
|
|
{
|
|
$stream = substr($stream, 5);
|
|
return new BooleanLiteral(false);
|
|
}
|
|
throw new \Exception('Unparseable boolean');
|
|
}
|
|
|
|
/**
|
|
* Get the value of this token.
|
|
*
|
|
* @param ?\App\Util\GraphNode[] $arguments
|
|
* @return \App\Util\GraphNode|Token|scalar|null
|
|
*/
|
|
public function execute(?array $arguments = null)
|
|
{
|
|
return $this->getValue();
|
|
}
|
|
}
|
|
|