index/src/Type.php

<?php
// Type.php
// Created: 2021-04-26
// Updated: 2022-02-28

namespace Index;

use ReflectionClass;
use RuntimeException;

final class Type {
    /**
     * Boolean type id.
     *
     * @var string
     */
    public const BOOL = 'boolean';

    /**
     * Integer type id.
     *
     * @var string
     */
    public const INTEGER = 'integer';

    /**
     * Floating point type id.
     *
     * @var string
     */
    public const FLOAT = 'double';

    /**
     * String type id.
     *
     * @var string
     */
    public const STRING = 'string';

    /**
     * Array type id.
     *
     * @var string
     */
    public const ARRAY = 'array';

    /**
     * Object type id.
     *
     * @var string
     */
    public const OBJECT = 'object';

    /**
     * Resource type id.
     *
     * @var string
     */
    public const RESOURCE = 'resource';

    /**
     * Closed resource type id.
     *
     * @var string
     */
    public const CLOSED_RESOURCE = 'resource (closed)';

    /**
     * NULL type id.
     *
     * @var string
     */
    public const NULL = 'NULL';

    /**
     * Unknown type id.
     *
     * @var string
     */
    public const UNKNOWN = 'unknown type';

    /**
     * Gets the default value for this type.
     *
     * @return mixed Default value for the given base type.
     */
    public static function default(string $type): mixed {
        switch($type) {
            case self::BOOL:
                return false;
            case self::INTEGER:
                return 0;
            case self::FLOAT:
                return 0.0;
            case self::STRING:
                return '';
            case self::ARRAY:
                return [];
            default:
                return null;
        }
    }

    /**
     * Gets a list of all class names this Type inherits.
     *
     * @param string|object $target Target object.
     * @return array Array containing the names.
     */
    public static function classTree(string|object $target): array {
        if(is_object($target))
            $target = get_class($target);

        $tree = [];
        $classInfo = new ReflectionClass($target);

        foreach($classInfo->getInterfaceNames() as $interface)
            $tree[] = $interface;

        do {
            $tree[] = $classInfo->getName();
        } while(($classInfo = $classInfo->getParentClass()) !== false);

        return $tree;
    }
}