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当前路径：vendor/phpdocumentor/type-resolver/src/Types/Context.php
<?php

declare(strict_types=1);

/**
 * This file is part of phpDocumentor.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @link      http://phpdoc.org
 */

namespace phpDocumentor\Reflection\Types;

use function strlen;
use function substr;
use function trim;

/**
 * Provides information about the Context in which the DocBlock occurs that receives this context.
 *
 * A DocBlock does not know of its own accord in which namespace it occurs and which namespace aliases are applicable
 * for the block of code in which it is in. This information is however necessary to resolve Class names in tags since
 * you can provide a short form or make use of namespace aliases.
 *
 * The phpDocumentor Reflection component knows how to create this class but if you use the DocBlock parser from your
 * own application it is possible to generate a Context class using the ContextFactory; this will analyze the file in
 * which an associated class resides for its namespace and imports.
 *
 * @see ContextFactory::createFromClassReflector()
 * @see ContextFactory::createForNamespace()
 *
 * @psalm-immutable
 */
final class Context
{
    /** @var string The current namespace. */
    private $namespace;

    /**
     * @var string[] List of namespace aliases => Fully Qualified Namespace.
     * @psalm-var array<string, string>
     */
    private $namespaceAliases;

    /**
     * Initializes the new context and normalizes all passed namespaces to be in Qualified Namespace Name (QNN)
     * format (without a preceding `\`).
     *
     * @param string   $namespace        The namespace where this DocBlock resides in.
     * @param string[] $namespaceAliases List of namespace aliases => Fully Qualified Namespace.
     *
     * @psalm-param array<string, string> $namespaceAliases
     */
    public function __construct(string $namespace, array $namespaceAliases = [])
    {
        $this->namespace = $namespace !== 'global' && $namespace !== 'default'
            ? trim($namespace, '\\')
            : '';

        foreach ($namespaceAliases as $alias => $fqnn) {
            if ($fqnn[0] === '\\') {
                $fqnn = substr($fqnn, 1);
            }

            if ($fqnn[strlen($fqnn) - 1] === '\\') {
                $fqnn = substr($fqnn, 0, -1);
            }

            $namespaceAliases[$alias] = $fqnn;
        }

        $this->namespaceAliases = $namespaceAliases;
    }

    /**
     * Returns the Qualified Namespace Name (thus without `\` in front) where the associated element is in.
     */
    public function getNamespace() : string
    {
        return $this->namespace;
    }

    /**
     * Returns a list of Qualified Namespace Names (thus without `\` in front) that are imported, the keys represent
     * the alias for the imported Namespace.
     *
     * @return string[]
     *
     * @psalm-return array<string, string>
     */
    public function getNamespaceAliases() : array
    {
        return $this->namespaceAliases;
    }
}

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