byrokrat\autogiro\Visitor\Visitor

Complexity

Total Complexity

10

Size/Duplication

Total Lines	52
Duplicated Lines	0 %

Importance

Changes	2
Bugs	0	Features	0

6 Methods

Rating	Name	Duplication	Size	Complexity
A	dispatch()	0	8	2
A	visitAfter()	0	3	1
A	after()	0	3	1
A	visit()	0	8	4
A	visitBefore()	0	3	1
A	before()	0	3	1

<?php

/**
 * This file is part of byrokrat\autogiro.
 *
 * byrokrat\autogiro is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * byrokrat\autogiro is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with byrokrat\autogiro. If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2016-21 Hannes Forsgård
 */

declare(strict_types=1);

namespace byrokrat\autogiro\Visitor;

use byrokrat\autogiro\Tree\Node;

/**
 * Visitor that dynamically calls method based on node name and type
 *
 * Will read the node name and type (eg. SomeNode) and dispatch a node specific
 * method if defined in visitor (eg. beforeSomeNode or afterSomeNode).
 */
class Visitor implements VisitorInterface
{
    private const AFTER = 'after';
    private const BEFORE = 'before';

    /**
     * @var array<string, array>
     */
    private $hooks = [
        self::AFTER => [],
        self::BEFORE => [],
    ];

    public function after(string $name, callable $hook): void
    {
        $this->hooks[self::AFTER][strtolower($name)] = $hook;
    }

    public function before(string $name, callable $hook): void
    {
        $this->hooks[self::BEFORE][strtolower($name)] = $hook;
    }

    public function visitAfter(Node $node): void
    {
        $this->visit(self::AFTER, $node);
    }

    public function visitBefore(Node $node): void
    {
        $this->visit(self::BEFORE, $node);
    }

    private function visit(string $prefix, Node $node): void
    {
        if ($node->getName()) {
            $this->dispatch($prefix, $node->getName(), $node);
        }

        if ($node->getType() && $node->getType() != $node->getName()) {
            $this->dispatch($prefix, $node->getType(), $node);
        }
    }

    private function dispatch(string $prefix, string $name, Node $node): void
    {
        ($this->hooks[$prefix][strtolower($name)] ?? function () {})($node); // phpcs:ignore

        $method = $prefix . $name;

        if (method_exists($this, $method)) {
            $this->$method($node);
        }
    }
}