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Filename : UriTemplate.php
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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\Exceptions\TemplateCanNotBeExpanded;
use League\Uri\UriTemplate\Template;
use League\Uri\UriTemplate\VariableBag;

/**
 * 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
 *
 * Based on GuzzleHttp\UriTemplate class in Guzzle v6.5.
 * @link https://github.com/guzzle/guzzle/blob/6.5/src/UriTemplate.php
 */
final class UriTemplate
{
    /**
     * @var Template
     */
    private $template;

    /**
     * @var VariableBag
     */
    private $defaultVariables;

    /**
     * @param object|string $template a string or an object with the __toString method
     *
     * @throws \TypeError               if the template is not a string or an object with the __toString method
     * @throws SyntaxError              if the template syntax is invalid
     * @throws TemplateCanNotBeExpanded if the template variables are invalid
     */
    public function __construct($template, array $defaultVariables = [])
    {
        $this->template = Template::createFromString($template);
        $this->defaultVariables = $this->filterVariables($defaultVariables);
    }

    public static function __set_state(array $properties): self
    {
        return new self($properties['template']->toString(), $properties['defaultVariables']->all());
    }

    /**
     * Filters out variables for the given template.
     *
     * @param array<string,string|array<string>> $variables
     */
    private function filterVariables(array $variables): VariableBag
    {
        $output = new VariableBag();
        foreach ($this->template->variableNames() as $name) {
            if (isset($variables[$name])) {
                $output->assign($name, $variables[$name]);
            }
        }

        return $output;
    }

    /**
     * The template string.
     */
    public function getTemplate(): string
    {
        return $this->template->toString();
    }

    /**
     * Returns the names of the variables in the template, in order.
     *
     * @return string[]
     */
    public function getVariableNames(): array
    {
        return $this->template->variableNames();
    }

    /**
     * Returns the default values used to expand the template.
     *
     * The returned list only contains variables whose name is part of the current template.
     *
     * @return array<string,string|array>
     */
    public function getDefaultVariables(): array
    {
        return $this->defaultVariables->all();
    }

    /**
     * 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.
     */
    public function withDefaultVariables(array $defaultDefaultVariables): self
    {
        $clone = clone $this;
        $clone->defaultVariables = $this->filterVariables($defaultDefaultVariables);

        return $clone;
    }

    /**
     * @throws TemplateCanNotBeExpanded if the variable contains nested array values
     * @throws UriException             if the resulting expansion can not be converted to a UriInterface instance
     */
    public function expand(array $variables = []): UriInterface
    {
        $uriString = $this->template->expand(
            $this->filterVariables($variables)->replace($this->defaultVariables)
        );

        return Uri::createFromString($uriString);
    }
}