--- /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;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Name;
+use PhpParser\Node\Stmt\Class_ as ClassStmt;
+use PhpParser\Node\Stmt\Trait_ as TraitStmt;
+use Psy\Exception\ErrorException;
+
+/**
+ * The called class pass throws warnings for get_class() and get_called_class()
+ * outside a class context.
+ */
+class CalledClassPass extends CodeCleanerPass
+{
+ private $inClass;
+
+ /**
+ * @param array $nodes
+ */
+ public function beforeTraverse(array $nodes)
+ {
+ $this->inClass = false;
+ }
+
+ /**
+ * @throws ErrorException if get_class or get_called_class is called without an object from outside a class
+ *
+ * @param Node $node
+ */
+ public function enterNode(Node $node)
+ {
+ if ($node instanceof ClassStmt || $node instanceof TraitStmt) {
+ $this->inClass = true;
+ } elseif ($node instanceof FuncCall && !$this->inClass) {
+ // We'll give any args at all (besides null) a pass.
+ // Technically we should be checking whether the args are objects, but this will do for now.
+ //
+ // TODO: switch this to actually validate args when we get context-aware code cleaner passes.
+ if (!empty($node->args) && !$this->isNull($node->args[0])) {
+ return;
+ }
+
+ // We'll ignore name expressions as well (things like `$foo()`)
+ if (!($node->name instanceof Name)) {
+ return;
+ }
+
+ $name = strtolower($node->name);
+ if (in_array($name, array('get_class', 'get_called_class'))) {
+ $msg = sprintf('%s() called without object from outside a class', $name);
+ throw new ErrorException($msg, 0, E_USER_WARNING, null, $node->getLine());
+ }
+ }
+ }
+
+ /**
+ * @param Node $node
+ */
+ public function leaveNode(Node $node)
+ {
+ if ($node instanceof ClassStmt) {
+ $this->inClass = false;
+ }
+ }
+
+ private function isNull(Node $node)
+ {
+ return $node->value instanceof ConstFetch && strtolower($node->value->name) === 'null';
+ }
+}