class TraversablePatch

class TraversablePatch implements ClassPatchInterface {
    
    /**
     * Supports nodetree, that implement Traversable, but not Iterator or IteratorAggregate.
     *
     * @param ClassNode $node
     *
     * @return bool
     */
    public function supports(ClassNode $node) {
        if (in_array('Iterator', $node->getInterfaces())) {
            return false;
        }
        if (in_array('IteratorAggregate', $node->getInterfaces())) {
            return false;
        }
        foreach ($node->getInterfaces() as $interface) {
            if ('Traversable' !== $interface && !is_subclass_of($interface, 'Traversable')) {
                continue;
            }
            if ('Iterator' === $interface || is_subclass_of($interface, 'Iterator')) {
                continue;
            }
            if ('IteratorAggregate' === $interface || is_subclass_of($interface, 'IteratorAggregate')) {
                continue;
            }
            return true;
        }
        return false;
    }
    
    /**
     * Forces class to implement Iterator interface.
     *
     * @param ClassNode $node
     */
    public function apply(ClassNode $node) {
        $node->addInterface('Iterator');
        $currentMethod = new MethodNode('current');
        \PHP_VERSION_ID >= 80100 && $currentMethod->setReturnTypeNode(new ReturnTypeNode('mixed'));
        $node->addMethod($currentMethod);
        $keyMethod = new MethodNode('key');
        \PHP_VERSION_ID >= 80100 && $keyMethod->setReturnTypeNode(new ReturnTypeNode('mixed'));
        $node->addMethod($keyMethod);
        $nextMethod = new MethodNode('next');
        \PHP_VERSION_ID >= 80100 && $nextMethod->setReturnTypeNode(new ReturnTypeNode('void'));
        $node->addMethod($nextMethod);
        $rewindMethod = new MethodNode('rewind');
        \PHP_VERSION_ID >= 80100 && $rewindMethod->setReturnTypeNode(new ReturnTypeNode('void'));
        $node->addMethod($rewindMethod);
        $validMethod = new MethodNode('valid');
        \PHP_VERSION_ID >= 80100 && $validMethod->setReturnTypeNode(new ReturnTypeNode('bool'));
        $node->addMethod($validMethod);
    }
    
    /**
     * Returns patch priority, which determines when patch will be applied.
     *
     * @return int Priority number (higher - earlier)
     */
    public function getPriority() {
        return 100;
    }

}