comparison vendor/psy/psysh/src/Psy/CodeCleaner/LoopContextPass.php @ 0:4c8ae668cc8c

Initial import (non-working)

+<?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\Scalar\DNumber;
+use PhpParser\Node\Scalar\LNumber;
+use PhpParser\Node\Stmt\Break_;
+use PhpParser\Node\Stmt\Continue_;
+use PhpParser\Node\Stmt\Do_;
+use PhpParser\Node\Stmt\For_;
+use PhpParser\Node\Stmt\Foreach_;
+use PhpParser\Node\Stmt\Switch_;
+use PhpParser\Node\Stmt\While_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * The loop context pass handles invalid `break` and `continue` statements.
+ */
+class LoopContextPass extends CodeCleanerPass
+{
+    private $isPHP54;
+    private $loopDepth;
+
+    public function __construct()
+    {
+        $this->isPHP54 = version_compare(PHP_VERSION, '5.4.0', '>=');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function beforeTraverse(array $nodes)
+    {
+        $this->loopDepth = 0;
+    }
+
+    /**
+     * @throws FatalErrorException if the node is a break or continue in a non-loop or switch context
+     * @throws FatalErrorException if the node is trying to break out of more nested structures than exist
+     * @throws FatalErrorException if the node is a break or continue and has a non-numeric argument
+     * @throws FatalErrorException if the node is a break or continue and has an argument less than 1
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        switch (true) {
+            case $node instanceof Do_:
+            case $node instanceof For_:
+            case $node instanceof Foreach_:
+            case $node instanceof Switch_:
+            case $node instanceof While_:
+                $this->loopDepth++;
+                break;
+
+            case $node instanceof Break_:
+            case $node instanceof Continue_:
+                $operator = $node instanceof Break_ ? 'break' : 'continue';
+
+                if ($this->loopDepth === 0) {
+                    $msg = sprintf("'%s' not in the 'loop' or 'switch' context", $operator);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+
+                if ($node->num instanceof LNumber || $node->num instanceof DNumber) {
+                    $num = $node->num->value;
+                    if ($this->isPHP54 && ($node->num instanceof DNumber || $num < 1)) {
+                        $msg = sprintf("'%s' operator accepts only positive numbers", $operator);
+                        throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                    }
+
+                    if ($num > $this->loopDepth) {
+                        $msg = sprintf("Cannot '%s' %d levels", $operator, $num);
+                        throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                    }
+                } elseif ($node->num && $this->isPHP54) {
+                    $msg = sprintf("'%s' operator with non-constant operand is no longer supported", $operator);
+                    throw new FatalErrorException($msg, 0, E_ERROR, null, $node->getLine());
+                }
+                break;
+        }
+    }
+
+    /**
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        switch (true) {
+            case $node instanceof Do_:
+            case $node instanceof For_:
+            case $node instanceof Foreach_:
+            case $node instanceof Switch_:
+            case $node instanceof While_:
+                $this->loopDepth--;
+                break;
+        }
+    }
+}