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

diff --git a/vendor/psy/psysh/src/CodeCleaner/StrictTypesPass.php b/vendor/psy/psysh/src/CodeCleaner/StrictTypesPass.php
new file mode 100644 (file)
index 0000000..81bf839
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+++ b/vendor/psy/psysh/src/CodeCleaner/StrictTypesPass.php
@@ -0,0 +1,87 @@
+<?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\Identifier;
+use PhpParser\Node\Scalar\LNumber;
+use PhpParser\Node\Stmt\Declare_;
+use PhpParser\Node\Stmt\DeclareDeclare;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Provide implicit strict types declarations for for subsequent execution.
+ *
+ * The strict types pass remembers the last strict types declaration:
+ *
+ *     declare(strict_types=1);
+ *
+ * ... which it then applies implicitly to all future evaluated code, until it
+ * is replaced by a new declaration.
+ */
+class StrictTypesPass extends CodeCleanerPass
+{
+    const EXCEPTION_MESSAGE = 'strict_types declaration must have 0 or 1 as its value';
+
+    private $strictTypes = false;
+    private $atLeastPhp7;
+
+    public function __construct()
+    {
+        $this->atLeastPhp7 = version_compare(PHP_VERSION, '7.0', '>=');
+    }
+
+    /**
+     * If this is a standalone strict types declaration, remember it for later.
+     *
+     * Otherwise, apply remembered strict types declaration to to the code until
+     * a new declaration is encountered.
+     *
+     * @throws FatalErrorException if an invalid `strict_types` declaration is found
+     *
+     * @param array $nodes
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        if (!$this->atLeastPhp7) {
+            return;
+        }
+
+        $prependStrictTypes = $this->strictTypes;
+
+        foreach ($nodes as $key => $node) {
+            if ($node instanceof Declare_) {
+                foreach ($node->declares as $declare) {
+                    // For PHP Parser 4.x
+                    $declareKey = $declare->key instanceof Identifier ? $declare->key->toString() : $declare->key;
+                    if ($declareKey === 'strict_types') {
+                        $value = $declare->value;
+                        if (!$value instanceof LNumber || ($value->value !== 0 && $value->value !== 1)) {
+                            throw new FatalErrorException(self::EXCEPTION_MESSAGE, 0, E_ERROR, null, $node->getLine());
+                        }
+
+                        $this->strictTypes = $value->value === 1;
+                    }
+                }
+            }
+        }
+
+        if ($prependStrictTypes) {
+            $first = reset($nodes);
+            if (!$first instanceof Declare_) {
+                $declare = new Declare_([new DeclareDeclare('strict_types', new LNumber(1))]);
+                array_unshift($nodes, $declare);
+            }
+        }
+
+        return $nodes;
+    }
+}