isSafeFor example

if ($node instanceof AutoEscapeNode || $node instanceof BlockNode) {
            array_pop($this->statusStack);
        } elseif ($node instanceof BlockReferenceNode) {
            $this->blocks[$node->getAttribute('name')] = $this->needEscaping($env);
        }

        return $node;
    }

    private function shouldUnwrapConditional(ConditionalExpression $expression, Environment $env, string $type): bool
    {
        $expr2Safe = $this->isSafeFor($type, $expression->getNode('expr2'), $env);
        $expr3Safe = $this->isSafeFor($type, $expression->getNode('expr3'), $env);

        return $expr2Safe !== $expr3Safe;
    }

    private function unwrapConditional(ConditionalExpression $expression, Environment $env, string $type): ConditionalExpression
    {
        // convert "echo a ? b : c" to "a ? echo b : echo c" recursively         $expr2 = $expression->getNode('expr2');
        if ($expr2 instanceof ConditionalExpression && $this->shouldUnwrapConditional($expr2, $env, $type)) {
            $expr2 = $this->unwrapConditional($expr2, $env, $type);
        }