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✏️ Editing: NamespacePass.php

<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2018 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy\CodeCleaner;

use PhpParser\Node\Name;
use PhpParser\Node\Stmt\Namespace_;
use Psy\CodeCleaner;

/**
 * Provide implicit namespaces for subsequent execution.
 *
 * The namespace pass remembers the last standalone namespace line encountered:
 *
 *     namespace Foo\Bar;
 *
 * ... which it then applies implicitly to all future evaluated code, until the
 * namespace is replaced by another namespace. To reset to the top level
 * namespace, enter `namespace {}`. This is a bit ugly, but it does the trick :)
 */
class NamespacePass extends CodeCleanerPass
{
    private $namespace = null;
    private $cleaner;

/**
     * @param CodeCleaner $cleaner
     */
    public function __construct(CodeCleaner $cleaner)
    {
        $this->cleaner = $cleaner;
    }

/**
     * If this is a standalone namespace line, remember it for later.
     *
     * Otherwise, apply remembered namespaces to the code until a new namespace
     * is encountered.
     *
     * @param array $nodes
     */
    public function beforeTraverse(array $nodes)
    {
        if (empty($nodes)) {
            return $nodes;
        }

$last = \end($nodes);

if ($last instanceof Namespace_) {
            $kind = $last->getAttribute('kind');

// Treat all namespace statements pre-PHP-Parser v3.1.2 as "open",
            // even though we really have no way of knowing.
            if ($kind === null || $kind === Namespace_::KIND_SEMICOLON) {
                // Save the current namespace for open namespaces
                $this->setNamespace($last->name);
            } else {
                // Clear the current namespace after a braced namespace
                $this->setNamespace(null);
            }

return $nodes;
        }

return $this->namespace ? [new Namespace_($this->namespace, $nodes)] : $nodes;
    }

/**
     * Remember the namespace and (re)set the namespace on the CodeCleaner as
     * well.
     *
     * @param null|Name $namespace
     */
    private function setNamespace($namespace)
    {
        $this->namespace = $namespace;
        $this->cleaner->setNamespace($namespace === null ? null : $namespace->parts);
    }
}

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