yii源码分析2，yii源码分析

yii源码分析2，yii源码分析

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上一篇主要分析了Yii::createWebApplication ( $config )->run ();的createWebApplication ( $config )部分，这篇分析后面的。

run()也是不在CWebApplication里面，在CApplication 里。

 1 php
 2 abstract class CApplication extends CModule {
 3     private $_id;
 4     private $_basePath;
 5     abstract public function processRequest();
 6     public function __construct($config = null) {
 7         if (is_string ( $config ))
 8             $config = require ($config);
 9         Yii::setApplication ( $this );//保存整个app实例
10         if (isset ( $config ['basePath'] )) {
11             $this->setBasePath ( $config ['basePath'] );
12             unset ( $config ['basePath'] );
13         } else
14             $this->setBasePath ( 'protected' );
15         //设置别名,后面就可以用application表示basePath了
16         Yii::setPathOfAlias ( 'application', $this->getBasePath () );
17         //钩子，模块 预 初始化时执行，子类实现。不过这时，配置还没有写入框架
18         $this->preinit ();
19         $this->registerCoreComponents ();
20         //父类实现
21         $this->configure ( $config );
22         //加载静态应用组件
23         $this->preloadComponents ();
24         //这才开始初始化模块
25         $this->init ();
26     }
27     protected function registerCoreComponents() {
28         $components = array (
29                 'request' => array (
30                         'class' => 'CHttpRequest'
31                 ),
32                 'urlManager' => array (
33                         'class' => 'CUrlManager'
34                 )
35         );
36 
37         $this->setComponents ( $components );//父类实现
38     }
39     public function run() {
40         $this->processRequest ();
41     }
42     public function getId() {
43         if ($this->_id !== null)
44             return $this->_id;
45         else
46             return $this->_id = sprintf ( '%x', crc32 ( $this->getBasePath () . $this->name ) );
47     }
48     public function setId($id) {
49         $this->_id = $id;
50     }
51     public function getBasePath() {
52         return $this->_basePath;
53     }
54     public function setBasePath($path) {
55         if (($this->_basePath = realpath ( $path )) === false || ! is_dir ( $this->_basePath ))
56             return;
57     }
58     public function getDb() {
59         return $this->getComponent ( 'db' );//父类实现
60     }
61     public function getUrlManager() {
62         return $this->getComponent ( 'urlManager' );
63     }
64     public function getController() {
65         return null;
66     }
67     public function getBaseUrl($absolute = false) {
68         return $this->getRequest ()->getBaseUrl ( $absolute );
69     }
70 }

run()又用了CWebApplication里面的processRequest()。薛强大哥（yii作者），架构要不要这样啊.裁剪后当然觉得这样的调用很没意思。

后面的主要在CWebApplication里了。

 1 php
 2 class CWebApplication extends CApplication {
 3     public $controllerNamespace;
 4     private $_controllerPath;
 5     private $_viewPath;
 6     private $_systemViewPath;
 7     private $_controller;
 8     public $controllerMap=array();
 9     public function processRequest() {//开始执行请求
10         //获取urlManager组件，解析请求，得到controller/action这种格式的string,
11         //并且将隐藏参数与请求的参数一一对应，匹配起来，写入$_REQUEST中
12         $route = $this->getUrlManager ()->parseUrl ($this->getRequest());
13         $this->runController ( $route );
14     }
15     public function getRequest() {//获取request组件
16         return $this->getComponent ( 'request' );
17     }
18     protected function registerCoreComponents() {//注册核心组件
19         parent::registerCoreComponents ();
20     }
21     //执行contronller
22     public function runController($route) {
23         if (($ca = $this->createController ( $route )) !== null) {
24             list ( $controller, $actionID ) = $ca;
25             $oldController = $this->_controller;
26             $this->_controller = $controller;
27             $controller->init ();//钩子,在执行action方法前调用，子类去实现
28             $controller->run ( $actionID );//开始转入controller类中action方法的执行
29             $this->_controller = $oldController;
30         }
31     }
32     //创建controller类实例,从controller/action这种格式的string中解析出$controller, $actionID 
33     public function createController($route, $owner = null) {
34         if ($owner === null)
35             $owner = $this;
36         if (($route = trim ( $route, '/' )) === '')
37             $route = $owner->defaultController;
38 
39         $route .= '/';
40         while ( ($pos = strpos ( $route, '/' )) !== false ) {
41             $id = substr ( $route, 0, $pos );
42             if (! preg_match ( '/^\w+$/', $id ))
43                 return null;
44             $id = strtolower ( $id );
45             $route = ( string ) substr ( $route, $pos + 1 );
46             if (! isset ( $basePath ))             // first segment
47             {
48                 $basePath = $owner->getControllerPath ();
49                 $controllerID = '';
50             } else {
51                 $controllerID .= '/';
52             }
53             $className = ucfirst ( $id ) . 'Controller';
54             $classFile = $basePath . DIRECTORY_SEPARATOR . $className . '.php';
55 
56             if (is_file ( $classFile )) {
57                 if (! class_exists ( $className, false ))
58                     require ($classFile);
59                 if (class_exists ( $className, false ) && is_subclass_of ( $className, 'CController' )) {
60                     $id [0] = strtolower ( $id [0] );
61                     return array (
62                             new $className ( $controllerID . $id, $owner === $this ? null : $owner ),
63                             $this->parseActionParams ( $route )
64                     );
65                 }
66                 return null;
67             }
68             $controllerID .= $id;
69             $basePath .= DIRECTORY_SEPARATOR . $id;
70         }
71     }
72     protected function parseActionParams($pathInfo) {
73         if (($pos = strpos ( $pathInfo, '/' )) !== false) {
74             $manager = $this->getUrlManager ();//再次获取urlManager,在上面第一次调用中已经导入。
75             $manager->parsePathInfo ( ( string ) substr ( $pathInfo, $pos + 1 ) );
76             $actionID = substr ( $pathInfo, 0, $pos );
77             return $manager->caseSensitive ? $actionID : strtolower ( $actionID );
78         } else
79             return $pathInfo;
80     }
81     public function getControllerPath() {
82         if ($this->_controllerPath !== null)
83             return $this->_controllerPath;
84         else
85             return $this->_controllerPath = $this->getBasePath () . DIRECTORY_SEPARATOR . 'controllers';
86     }
87     //两个钩子,子类去实现
88     public function beforeControllerAction($controller, $action) {
89         return true;
90     }
91     public function afterControllerAction($controller, $action) {
92     }
93     protected function init() {
94         parent::init ();
95     }
96 }

对于$this->getUrlManager ()，YiiBase里面有'CUrlManager' => 'CUrlManager.php'这个映射，说明是实例化了CUrlManager这个类。

 1 php
 2 class CUrlManager {
 3     const GET_FORMAT = 'get';
 4     public $rules = array ();
 5     public $urlSuffix = '';
 6     public $caseSensitive = true;
 7     public $urlRuleClass = 'CUrlRule';
 8     private $_urlFormat = self::GET_FORMAT;
 9     private $_rules = array ();
10     private $_baseUrl;
11     protected function processRules() {
12         //遍历自定义的请求匹配规则
13         foreach ( $this->rules as $pattern => $route ) {
14             //对每一个规则创建CUrlRule实例
15             $this->_rules [] = $this->createUrlRule ( $route, $pattern );
16         }
17     }
18     protected function createUrlRule($route, $pattern) {
19         if (is_array ( $route ) && isset ( $route ['class'] ))
20             return $route;
21         else {
22             //import第二个参数表示是否立即包含类文件。 如果为flase，则类文件仅在被使用时包含。 这个参数仅当使用一个类的路径 别名 时才会用到
23             $urlRuleClass = Yii::import ( $this->urlRuleClass, true );
24             //创建CUrlRule实例
25             return new $urlRuleClass ( $route, $pattern );
26         }
27     }
28     //类似于__construct()
29     public function init() {
30         $this->processRules ();
31     }
32     public function parseUrl($request) {
33         //获取请求
34         $rawPathInfo = $request->getPathInfo ();
35         $pathInfo = $this->removeUrlSuffix ( $rawPathInfo, $this->urlSuffix );
36         foreach ( $this->_rules as $i => $rule ) {
37             if (($r = $rule->parseUrl ( $this, $pathInfo, $rawPathInfo )) !== false) {
38                 return $r;
39             }
40         }
41         return $pathInfo;
42     }
43     //解析请求，将请求参数写入$_REQUEST
44     public function parsePathInfo($pathInfo) {
45         if ($pathInfo === '')
46             return;
47         $segs = explode ( '/', $pathInfo . '/' );
48         $n = count ( $segs );
49         for($i = 0; $i $n