Include Vendor

vendor/psy/psysh/src/CodeCleaner/ValidConstantPass.php

@@ -0,0 +1,90 @@
+<?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;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Identifier;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that namespaced constant references will succeed.
+ *
+ * This pass throws a FatalErrorException rather than letting PHP run
+ * headfirst into a real fatal error and die.
+ *
+ * @todo Detect constants defined in the current code snippet?
+ *       ... Might not be worth it, since it would need to both be defining and
+ *       referencing a namespaced constant, which doesn't seem like that big of
+ *       a target for failure
+ */
+class ValidConstantPass extends NamespaceAwarePass
+{
+    /**
+     * Validate that namespaced constant references will succeed.
+     *
+     * Note that this does not (yet) detect constants defined in the current code
+     * snippet. It won't happen very often, so we'll punt for now.
+     *
+     * @throws FatalErrorException if a constant reference is not defined
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if ($node instanceof ConstFetch && count($node->name->parts) > 1) {
+            $name = $this->getFullyQualifiedName($node->name);
+            if (!defined($name)) {
+                $msg = sprintf('Undefined constant %s', $name);
+                throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+            }
+        } elseif ($node instanceof ClassConstFetch) {
+            $this->validateClassConstFetchExpression($node);
+        }
+    }
+
+    /**
+     * Validate a class constant fetch expression.
+     *
+     * @throws FatalErrorException if a class constant is not defined
+     *
+     * @param ClassConstFetch $stmt
+     */
+    protected function validateClassConstFetchExpression(ClassConstFetch $stmt)
+    {
+        // For PHP Parser 4.x
+        $constName = $stmt->name instanceof Identifier ? $stmt->name->toString() : $stmt->name;
+
+        // give the `class` pseudo-constant a pass
+        if ($constName === 'class') {
+            return;
+        }
+
+        // if class name is an expression, give it a pass for now
+        if (!$stmt->class instanceof Expr) {
+            $className = $this->getFullyQualifiedName($stmt->class);
+
+            // if the class doesn't exist, don't throw an exception… it might be
+            // defined in the same line it's used or something stupid like that.
+            if (class_exists($className) || interface_exists($className)) {
+                $refl = new \ReflectionClass($className);
+                if (!$refl->hasConstant($constName)) {
+                    $constType = class_exists($className) ? 'Class' : 'Interface';
+                    $msg = sprintf('%s constant \'%s::%s\' not found', $constType, $className, $constName);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $stmt->getLine());
+                }
+            }
+        }
+    }
+}