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<?php
/**
* League.Uri (https://uri.thephpleague.com)
*
* (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace League\Uri;
use League\Uri\Contracts\UriException;
use League\Uri\Contracts\UriInterface;
use League\Uri\Exceptions\SyntaxError;
use League\Uri\UriTemplate\Template;
use League\Uri\UriTemplate\TemplateCanNotBeExpanded;
use League\Uri\UriTemplate\VariableBag;
use Stringable;
use function array_fill_keys;
use function array_key_exists;
/**
* Defines the URI Template syntax and the process for expanding a URI Template into a URI reference.
*
* @link https://tools.ietf.org/html/rfc6570
* @package League\Uri
* @author Ignace Nyamagana Butera <nyamsprod@gmail.com>
* @since 6.1.0
*/
final class UriTemplate
{
private readonly Template $template;
private readonly VariableBag $defaultVariables;
/**
* @throws SyntaxError if the template syntax is invalid
* @throws TemplateCanNotBeExpanded if the template or the variables are invalid
*/
public function __construct(Stringable|string $template, iterable $defaultVariables = [])
{
$this->template = $template instanceof Template ? $template : Template::new($template);
$this->defaultVariables = $this->filterVariables($defaultVariables);
}
private function filterVariables(iterable $variables): VariableBag
{
if (!$variables instanceof VariableBag) {
$variables = new VariableBag($variables);
}
return $variables
->filter(fn ($value, string|int $name) => array_key_exists(
$name,
array_fill_keys($this->template->variableNames, 1)
));
}
public function getTemplate(): string
{
return $this->template->value;
}
/**
* @return array<string>
*/
public function getVariableNames(): array
{
return $this->template->variableNames;
}
public function getDefaultVariables(): array
{
return iterator_to_array($this->defaultVariables);
}
/**
* Returns a new instance with the updated default variables.
*
* This method MUST retain the state of the current instance, and return
* an instance that contains the modified default variables.
*
* If present, variables whose name is not part of the current template
* possible variable names are removed.
*
* @throws TemplateCanNotBeExpanded if the variables are invalid
*/
public function withDefaultVariables(iterable $defaultVariables): self
{
$defaultVariables = $this->filterVariables($defaultVariables);
if ($defaultVariables == $this->defaultVariables) {
return $this;
}
return new self($this->template, $defaultVariables);
}
/**
* @throws TemplateCanNotBeExpanded if the variables are invalid
* @throws UriException if the resulting expansion cannot be converted to a UriInterface instance
*/
public function expand(iterable $variables = []): UriInterface
{
return Uri::new($this->template->expand(
$this->filterVariables($variables)->replace($this->defaultVariables)
));
}
/**
* @throws TemplateCanNotBeExpanded if the variables are invalid or missing
* @throws UriException if the resulting expansion cannot be converted to a UriInterface instance
*/
public function expandOrFail(iterable $variables = []): UriInterface
{
return Uri::new($this->template->expandOrFail(
$this->filterVariables($variables)->replace($this->defaultVariables)
));
}
}
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