TP5源码分析-加载基础文件【Loader主要功能图解】

  • 把loader主要的功能提取出来,从属性和方法着手,大致可以分为这些

  • 上图说明一切
    TP5源码分析-加载基础文件【Loader主要功能图解】_第1张图片

  • 接下来我们就要刨根问底,走进去看看Loader类里面到底是个什么鬼

  • 附上源码



namespace think;

use think\exception\ClassNotFoundException;

class Loader
{
    /**
     * 类名映射信息
     * @var array
     */
    protected static $classMap = [];

    /**
     * 类库别名
     * @var array
     */
    protected static $classAlias = [];

    /**
     * PSR-4
     * @var array
     */
    private static $prefixLengthsPsr4 = [];
    private static $prefixDirsPsr4    = [];
    private static $fallbackDirsPsr4  = [];

    /**
     * PSR-0
     * @var array
     */
    private static $prefixesPsr0     = [];
    private static $fallbackDirsPsr0 = [];

    /**
     * 需要加载的文件
     * @var array
     */
    private static $files = [];

    /**
     * Composer安装路径
     * @var string
     */
    private static $composerPath;

    // 获取应用根目录
    public static function getRootPath()
    {
        if ('cli' == PHP_SAPI) {
            $scriptName = realpath($_SERVER['argv'][0]);
        } else {
            $scriptName = $_SERVER['SCRIPT_FILENAME'];
        }

        $path = realpath(dirname($scriptName));

        if (!is_file($path . DIRECTORY_SEPARATOR . 'think')) {
            $path = dirname($path);
        }

        return $path . DIRECTORY_SEPARATOR;
    }

    // 注册自动加载机制
    public static function register($autoload = '')
    {
        // 注册系统自动加载
        spl_autoload_register($autoload ?: 'think\\Loader::autoload', true, true);

        $rootPath = self::getRootPath();

        self::$composerPath = $rootPath . 'vendor' . DIRECTORY_SEPARATOR . 'composer' . DIRECTORY_SEPARATOR;

        // Composer自动加载支持
        if (is_dir(self::$composerPath)) {
            if (is_file(self::$composerPath . 'autoload_static.php')) {
                require self::$composerPath . 'autoload_static.php';
               // require $rootPath.'extend/Liangzai.php';
                $declaredClass = get_declared_classes();

                $composerClass = array_pop($declaredClass);
                foreach (['prefixLengthsPsr4', 'prefixDirsPsr4', 'fallbackDirsPsr4', 'prefixesPsr0', 'fallbackDirsPsr0', 'classMap', 'files'] as $attr) {
                    if (property_exists($composerClass, $attr)) {
                        self::${$attr} = $composerClass::${$attr};
                    }
                }
            } else {
                self::registerComposerLoader(self::$composerPath);
            }
        }

        // 注册命名空间定义
        self::addNamespace([
            'think'  => __DIR__,
            'traits' => dirname(__DIR__) . DIRECTORY_SEPARATOR . 'traits',
        ]);

        // 加载类库映射文件
        if (is_file($rootPath . 'runtime' . DIRECTORY_SEPARATOR . 'classmap.php')) {
            self::addClassMap(__include_file($rootPath . 'runtime' . DIRECTORY_SEPARATOR . 'classmap.php'));
        }

        // 自动加载extend目录
        self::addAutoLoadDir($rootPath . 'extend');
    }

    // 自动加载
    public static function autoload($class)
    {

       // echo $class;
       // echo '
';
//返回别名 if (isset(self::$classAlias[$class])) { echo 4; return class_alias(self::$classAlias[$class], $class); } echo 5; if ($file = self::findFile($class)) { // Win环境严格区分大小写 if (strpos(PHP_OS, 'WIN') !== false && pathinfo($file, PATHINFO_FILENAME) != pathinfo(realpath($file), PATHINFO_FILENAME)) { return false; } __include_file($file); return true; } } /** * 查找文件 * @access private * @param string $class * @return string|false */ private static function findFile($class) { if (!empty(self::$classMap[$class])) { // 类库映射 return self::$classMap[$class]; } // 查找 PSR-4 $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . '.php'; // echo $class; // echo '
';
$first = $class[0];// think\Response t 取出第一个字母 if (isset(self::$prefixLengthsPsr4[$first])) { foreach (self::$prefixLengthsPsr4[$first] as $prefix => $length) { if (0 === strpos($class, $prefix)) { foreach (self::$prefixDirsPsr4[$prefix] as $dir) { if (is_file($file = $dir . DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $length))) { return $file; } } } } } // 查找 PSR-4 fallback dirs foreach (self::$fallbackDirsPsr4 as $dir) { if (is_file($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) { return $file; } } // 查找 PSR-0 if (false !== $pos = strrpos($class, '\\')) { // namespaced class name $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1) . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR); } else { // PEAR-like class name $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . '.php'; } if (isset(self::$prefixesPsr0[$first])) { foreach (self::$prefixesPsr0[$first] as $prefix => $dirs) { if (0 === strpos($class, $prefix)) { foreach ($dirs as $dir) { if (is_file($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) { return $file; } } } } } // 查找 PSR-0 fallback dirs foreach (self::$fallbackDirsPsr0 as $dir) { if (is_file($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) { return $file; } } return self::$classMap[$class] = false; } // 注册classmap public static function addClassMap($class, $map = '') { if (is_array($class)) { self::$classMap = array_merge(self::$classMap, $class); } else { self::$classMap[$class] = $map; } } // 注册命名空间 public static function addNamespace($namespace, $path = '') { if (is_array($namespace)) { foreach ($namespace as $prefix => $paths) { self::addPsr4($prefix . '\\', rtrim($paths, DIRECTORY_SEPARATOR), true); } } else { self::addPsr4($namespace . '\\', rtrim($path, DIRECTORY_SEPARATOR), true); } } // 添加Ps0空间 private static function addPsr0($prefix, $paths, $prepend = false) { if (!$prefix) { if ($prepend) { self::$fallbackDirsPsr0 = array_merge( (array) $paths, self::$fallbackDirsPsr0 ); } else { self::$fallbackDirsPsr0 = array_merge( self::$fallbackDirsPsr0, (array) $paths ); } return; } $first = $prefix[0]; if (!isset(self::$prefixesPsr0[$first][$prefix])) { self::$prefixesPsr0[$first][$prefix] = (array) $paths; return; } if ($prepend) { self::$prefixesPsr0[$first][$prefix] = array_merge( (array) $paths, self::$prefixesPsr0[$first][$prefix] ); } else { self::$prefixesPsr0[$first][$prefix] = array_merge( self::$prefixesPsr0[$first][$prefix], (array) $paths ); } } // 添加Psr4空间 private static function addPsr4($prefix, $paths, $prepend = false) { if (!$prefix) { // Register directories for the root namespace. if ($prepend) { self::$fallbackDirsPsr4 = array_merge( (array) $paths, self::$fallbackDirsPsr4 ); } else { self::$fallbackDirsPsr4 = array_merge( self::$fallbackDirsPsr4, (array) $paths ); } } elseif (!isset(self::$prefixDirsPsr4[$prefix])) { // Register directories for a new namespace. $length = strlen($prefix); if ('\\' !== $prefix[$length - 1]) { throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator."); } self::$prefixLengthsPsr4[$prefix[0]][$prefix] = $length; self::$prefixDirsPsr4[$prefix] = (array) $paths; } elseif ($prepend) { // Prepend directories for an already registered namespace. self::$prefixDirsPsr4[$prefix] = array_merge( (array) $paths, self::$prefixDirsPsr4[$prefix] ); } else { // Append directories for an already registered namespace. self::$prefixDirsPsr4[$prefix] = array_merge( self::$prefixDirsPsr4[$prefix], (array) $paths ); } } // 注册自动加载类库目录 public static function addAutoLoadDir($path) { self::$fallbackDirsPsr4[] = $path; } // 注册类别名 public static function addClassAlias($alias, $class = null) { if (is_array($alias)) { self::$classAlias = array_merge(self::$classAlias, $alias); } else { self::$classAlias[$alias] = $class; } } // 注册composer自动加载 public static function registerComposerLoader($composerPath) { if (is_file($composerPath . 'autoload_namespaces.php')) { $map = require $composerPath . 'autoload_namespaces.php'; foreach ($map as $namespace => $path) { self::addPsr0($namespace, $path); } } if (is_file($composerPath . 'autoload_psr4.php')) { $map = require $composerPath . 'autoload_psr4.php'; foreach ($map as $namespace => $path) { self::addPsr4($namespace, $path); } } if (is_file($composerPath . 'autoload_classmap.php')) { $classMap = require $composerPath . 'autoload_classmap.php'; if ($classMap) { self::addClassMap($classMap); } } if (is_file($composerPath . 'autoload_files.php')) { self::$files = require $composerPath . 'autoload_files.php'; } } // 加载composer autofile文件 public static function loadComposerAutoloadFiles() { foreach (self::$files as $fileIdentifier => $file) { if (empty($GLOBALS['__composer_autoload_files'][$fileIdentifier])) { __require_file($file); $GLOBALS['__composer_autoload_files'][$fileIdentifier] = true; } } } /** * 字符串命名风格转换 * type 0 将Java风格转换为C的风格 1 将C风格转换为Java的风格 * @access public * @param string $name 字符串 * @param integer $type 转换类型 * @param bool $ucfirst 首字母是否大写(驼峰规则) * @return string */ public static function parseName($name, $type = 0, $ucfirst = true) { if ($type) { $name = preg_replace_callback('/_([a-zA-Z])/', function ($match) { return strtoupper($match[1]); }, $name); return $ucfirst ? ucfirst($name) : lcfirst($name); } return strtolower(trim(preg_replace("/[A-Z]/", "_\\0", $name), "_")); } /** * 创建工厂对象实例 * @access public * @param string $name 工厂类名 * @param string $namespace 默认命名空间 * @return mixed */ public static function factory($name, $namespace = '', ...$args) { $class = false !== strpos($name, '\\') ? $name : $namespace . ucwords($name); if (class_exists($class)) { return Container::getInstance()->invokeClass($class, $args); } else { throw new ClassNotFoundException('class not exists:' . $class, $class); } } } /** * 作用范围隔离 * * @param $file * @return mixed */ function __include_file($file) { return include $file; } function __require_file($file) { return require $file; }

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