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76 lines
1.5 KiB
76 lines
1.5 KiB
3 years ago
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<?php
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declare(strict_types=1);
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namespace App\Cfnpp\Expression\Token;
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use App\Cfnpp\Expression\Token;
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use App\Cfnpp\Expression\TokenLiteral;
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/**
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* A boolean literal (true/false).
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*
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* @author Adam Pippin <hello@adampippin.ca>
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*/
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class BooleanLiteral extends TokenLiteral
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{
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/**
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* Value of this literal.
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* @var bool
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*/
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protected $value;
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/**
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* New boolean literal.
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*
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* @param bool $value
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*/
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public function __construct(bool $value)
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{
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$this->value = $value;
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}
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/**
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* Get the value of this literal.
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*
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* @return bool
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*/
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public function getValue(): bool
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{
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return $this->value;
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}
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public static function isToken(string $stream): bool
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{
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return
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(strlen($stream) >= 4 && strtolower(substr($stream, 0, 4)) == 'true') ||
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(strlen($stream) >= 5 && strtolower(substr($stream, 0, 5)) == 'false');
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}
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public static function getToken(string &$stream): Token
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{
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if (strlen($stream) >= 4 && strtolower(substr($stream, 0, 4)) == 'true')
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{
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$stream = substr($stream, 4);
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return new BooleanLiteral(true);
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}
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elseif (strlen($stream) >= 5 && strtolower(substr($stream, 0, 5)) == 'false')
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{
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$stream = substr($stream, 5);
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return new BooleanLiteral(false);
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}
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throw new \Exception('Unparseable boolean');
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}
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/**
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* Get the value of this token.
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*
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* @param ?\App\Util\GraphNode[] $arguments
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* @return \App\Util\GraphNode|Token|scalar|null
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*/
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public function execute(?array $arguments = null)
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{
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return $this->getValue();
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}
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}
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