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<?php
namespace YOOtheme\GraphQL\Type\Definition;
use YOOtheme\GraphQL\Error\Error;
use YOOtheme\GraphQL\Language\AST\StringValueNode;
use YOOtheme\GraphQL\Utils\Utils;
/**
* Class StringType
* @package GraphQL\Type\Definition
*/
class StringType extends ScalarType
{
/**
* @var string
*/
public $name = Type::STRING;
/**
* @var string
*/
public $description =
'The `String` scalar type represents textual data, represented as UTF-8
character sequences. The String type is most often used by GraphQL to
represent free-form human-readable text.';
/**
* @param mixed $value
* @return mixed|string
* @throws Error
*/
public function serialize($value)
{
if ($value === true) {
return 'true';
}
if ($value === false) {
return 'false';
}
if ($value === null) {
return 'null';
}
if (is_object($value) && method_exists($value, '__toString')) {
return (string) $value;
}
if (!is_scalar($value)) {
throw new Error("String cannot represent non scalar value: " . Utils::printSafe($value));
}
return $this->coerceString($value);
}
/**
* @param mixed $value
* @return string
* @throws Error
*/
public function parseValue($value)
{
return $this->coerceString($value);
}
/**
* @param $valueNode
* @param array|null $variables
* @return null|string
* @throws \Exception
*/
public function parseLiteral($valueNode, array $variables = null)
{
if ($valueNode instanceof StringValueNode) {
return $valueNode->value;
}
// Intentionally without message, as all information already in wrapped Exception
throw new \Exception();
}
private function coerceString($value) {
if (is_array($value)) {
throw new Error(
'String cannot represent an array value: ' .
Utils::printSafe($value)
);
}
return (string) $value;
}
}