Update Twig from 1.35.0 to 1.42.4 (PHP 5.5 is now required!)

This fixes some errors on PHP 7.4 and contains even more fixes
Also bumped PHP version to 5.5 as Twig requires it.

system/libs/Twig/NodeVisitor/SandboxNodeVisitor.php

@@ -0,0 +1,137 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\NodeVisitor;
+
+use Twig\Environment;
+use Twig\Node\CheckSecurityNode;
+use Twig\Node\CheckToStringNode;
+use Twig\Node\Expression\Binary\ConcatBinary;
+use Twig\Node\Expression\Binary\RangeBinary;
+use Twig\Node\Expression\FilterExpression;
+use Twig\Node\Expression\FunctionExpression;
+use Twig\Node\Expression\GetAttrExpression;
+use Twig\Node\Expression\NameExpression;
+use Twig\Node\ModuleNode;
+use Twig\Node\Node;
+use Twig\Node\PrintNode;
+use Twig\Node\SetNode;
+
+/**
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class SandboxNodeVisitor extends AbstractNodeVisitor
+{
+    protected $inAModule = false;
+    protected $tags;
+    protected $filters;
+    protected $functions;
+
+    private $needsToStringWrap = false;
+
+    protected function doEnterNode(Node $node, Environment $env)
+    {
+        if ($node instanceof ModuleNode) {
+            $this->inAModule = true;
+            $this->tags = [];
+            $this->filters = [];
+            $this->functions = [];
+
+            return $node;
+        } elseif ($this->inAModule) {
+            // look for tags
+            if ($node->getNodeTag() && !isset($this->tags[$node->getNodeTag()])) {
+                $this->tags[$node->getNodeTag()] = $node;
+            }
+
+            // look for filters
+            if ($node instanceof FilterExpression && !isset($this->filters[$node->getNode('filter')->getAttribute('value')])) {
+                $this->filters[$node->getNode('filter')->getAttribute('value')] = $node;
+            }
+
+            // look for functions
+            if ($node instanceof FunctionExpression && !isset($this->functions[$node->getAttribute('name')])) {
+                $this->functions[$node->getAttribute('name')] = $node;
+            }
+
+            // the .. operator is equivalent to the range() function
+            if ($node instanceof RangeBinary && !isset($this->functions['range'])) {
+                $this->functions['range'] = $node;
+            }
+
+            if ($node instanceof PrintNode) {
+                $this->needsToStringWrap = true;
+                $this->wrapNode($node, 'expr');
+            }
+
+            if ($node instanceof SetNode && !$node->getAttribute('capture')) {
+                $this->needsToStringWrap = true;
+            }
+
+            // wrap outer nodes that can implicitly call __toString()
+            if ($this->needsToStringWrap) {
+                if ($node instanceof ConcatBinary) {
+                    $this->wrapNode($node, 'left');
+                    $this->wrapNode($node, 'right');
+                }
+                if ($node instanceof FilterExpression) {
+                    $this->wrapNode($node, 'node');
+                    $this->wrapArrayNode($node, 'arguments');
+                }
+                if ($node instanceof FunctionExpression) {
+                    $this->wrapArrayNode($node, 'arguments');
+                }
+            }
+        }
+
+        return $node;
+    }
+
+    protected function doLeaveNode(Node $node, Environment $env)
+    {
+        if ($node instanceof ModuleNode) {
+            $this->inAModule = false;
+
+            $node->getNode('constructor_end')->setNode('_security_check', new Node([new CheckSecurityNode($this->filters, $this->tags, $this->functions), $node->getNode('display_start')]));
+        } elseif ($this->inAModule) {
+            if ($node instanceof PrintNode || $node instanceof SetNode) {
+                $this->needsToStringWrap = false;
+            }
+        }
+
+        return $node;
+    }
+
+    private function wrapNode(Node $node, $name)
+    {
+        $expr = $node->getNode($name);
+        if ($expr instanceof NameExpression || $expr instanceof GetAttrExpression) {
+            $node->setNode($name, new CheckToStringNode($expr));
+        }
+    }
+
+    private function wrapArrayNode(Node $node, $name)
+    {
+        $args = $node->getNode($name);
+        foreach ($args as $name => $_) {
+            $this->wrapNode($args, $name);
+        }
+    }
+
+    public function getPriority()
+    {
+        return 0;
+    }
+}
+
+class_alias('Twig\NodeVisitor\SandboxNodeVisitor', 'Twig_NodeVisitor_Sandbox');