Version 1

[yaffs-website] / vendor / psy / psysh / src / Psy / CodeCleaner / PassableByReferencePass.php

diff --git a/vendor/psy/psysh/src/Psy/CodeCleaner/PassableByReferencePass.php b/vendor/psy/psysh/src/Psy/CodeCleaner/PassableByReferencePass.php
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+<?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;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that only variables (and variable-like things) are passed by reference.
+ */
+class PassableByReferencePass extends CodeCleanerPass
+{
+    const EXCEPTION_MESSAGE = 'Only variables can be passed by reference';
+
+    /**
+     * @throws FatalErrorException if non-variables are passed by reference
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        // TODO: support MethodCall and StaticCall as well.
+        if ($node instanceof FuncCall) {
+            $name = $node->name;
+
+            // if function name is an expression or a variable, give it a pass for now.
+            if ($name instanceof Expr || $name instanceof Variable) {
+                return;
+            }
+
+            try {
+                $refl = new \ReflectionFunction(implode('\\', $name->parts));
+            } catch (\ReflectionException $e) {
+                // Well, we gave it a shot!
+                return;
+            }
+
+            foreach ($refl->getParameters() as $key => $param) {
+                if (array_key_exists($key, $node->args)) {
+                    $arg = $node->args[$key];
+                    if ($param->isPassedByReference() && !$this->isPassableByReference($arg)) {
+                        throw new FatalErrorException(self::EXCEPTION_MESSAGE);
+                    }
+                }
+            }
+        }
+    }
+
+    private function isPassableByReference(Node $arg)
+    {
+        // FuncCall, MethodCall and StaticCall are all PHP _warnings_ not fatal errors, so we'll let
+        // PHP handle those ones :)
+        return $arg->value instanceof ClassConstFetch ||
+            $arg->value instanceof PropertyFetch ||
+            $arg->value instanceof Variable ||
+            $arg->value instanceof FuncCall ||
+            $arg->value instanceof MethodCall ||
+            $arg->value instanceof StaticCall;
+    }
+}