--- /dev/null
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 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_ as NamespaceStmt;
+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)
+ {
+ $first = reset($nodes);
+ if (count($nodes) === 1 && $first instanceof NamespaceStmt && empty($first->stmts)) {
+ $this->setNamespace($first->name);
+ } else {
+ foreach ($nodes as $key => $node) {
+ if ($node instanceof NamespaceStmt) {
+ $this->setNamespace(null);
+ } elseif ($this->namespace !== null) {
+ $nodes[$key] = new NamespaceStmt($this->namespace, array($node));
+ }
+ }
+ }
+
+ return $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);
+ }
+}