<?php

/*
 * This file was imported from the webmozart/path-util package.
 *
 * (c) Bernhard Schussek <bschussek@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Webmozart\Glob;

/**
 * Contains utility methods for handling path strings.
 *
 * The methods in this class are able to deal with both UNIX and Windows paths
 * with both forward and backward slashes. All methods return normalized parts
 * containing only forward slashes and no excess "." and ".." segments.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 * @author Thomas Schulz <mail@king2500.net>
 *
 * @internal this class was introduced to remove an external dependency, but is
 *           not part of the public API of this package: do not use it directly.
 */
abstract class Path
{
    /**
     * Returns whether a path is absolute.
     *
     * @param string $path A path string.
     *
     * @return bool Returns true if the path is absolute, false if it is
     *              relative or empty.
     */
    public static function isAbsolute(string $path): bool
    {
        if ('' === $path) {
            return false;
        }

        // Strip scheme
        if (false !== ($pos = strpos($path, '://'))) {
            $path = substr($path, $pos + 3);
        }

        // UNIX root "/" or "\" (Windows style)
        if ('/' === $path[0] || '\\' === $path[0]) {
            return true;
        }

        // Windows root
        if (strlen($path) > 1 && ctype_alpha($path[0]) && ':' === $path[1]) {
            // Special case: "C:"
            if (2 === strlen($path)) {
                return true;
            }

            // Normal case: "C:/ or "C:\"
            if ('/' === $path[2] || '\\' === $path[2]) {
                return true;
            }
        }

        return false;
    }

    final private function __construct()
    {
    }
}