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<?php
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/*
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* This file is part of Composer.
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*
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* (c) Nils Adermann <naderman@naderman.de>
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* Jordi Boggiano <j.boggiano@seld.be>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Composer\Util;
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/**
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* Platform helper for uniform platform-specific tests.
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*
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* @author Niels Keurentjes <niels.keurentjes@omines.com>
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*/
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class Platform
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{
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/**
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* Parses tildes and environment variables in paths.
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*
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* @param string $path
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* @return string
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*/
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public static function expandPath($path)
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{
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if (preg_match('#^~[\\/]#', $path)) {
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return self::getUserDirectory() . substr($path, 1);
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}
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return preg_replace_callback('#^(\$|(?P<percent>%))(?P<var>\w++)(?(percent)%)(?P<path>.*)#', function ($matches) {
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// Treat HOME as an alias for USERPROFILE on Windows for legacy reasons
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if (Platform::isWindows() && $matches['var'] == 'HOME') {
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return (getenv('HOME') ?: getenv('USERPROFILE')) . $matches['path'];
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}
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return getenv($matches['var']) . $matches['path'];
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}, $path);
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}
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/**
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* @throws \RuntimeException If the user home could not reliably be determined
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* @return string The formal user home as detected from environment parameters
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*/
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public static function getUserDirectory()
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{
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if (false !== ($home = getenv('HOME'))) {
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return $home;
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}
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if (self::isWindows() && false !== ($home = getenv('USERPROFILE'))) {
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return $home;
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}
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if (function_exists('posix_getuid') && function_exists('posix_getpwuid')) {
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$info = posix_getpwuid(posix_getuid());
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return $info['dir'];
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}
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throw new \RuntimeException('Could not determine user directory');
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}
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/**
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* @return bool Whether the host machine is running a Windows OS
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*/
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public static function isWindows()
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{
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return defined('PHP_WINDOWS_VERSION_BUILD');
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}
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/**
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* @param string $str
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* @return int return a guaranteed binary length of the string, regardless of silly mbstring configs
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*/
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public static function strlen($str)
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{
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static $useMbString = null;
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if (null === $useMbString) {
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$useMbString = function_exists('mb_strlen') && ini_get('mbstring.func_overload');
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}
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if ($useMbString) {
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return mb_strlen($str, '8bit');
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}
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return strlen($str);
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}
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}
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