yii源码分析四——非核心类的导入注册

yii源码分析4——非核心类的导入注册

转载请注明： TheViper http://www.cnblogs.com/TheViper 

在yii源码分析1中说到spl_autoload_register注册给定的函数作为 __autoload 的实现，在这里是autoload（）.

<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">function</span> autoload(<span style="color: #800080;">$className</span><span style="color: #000000;">) {        </span><span style="color: #0000ff;">include</span> self::<span style="color: #800080;">$_coreClasses</span> [<span style="color: #800080;">$className</span><span style="color: #000000;">];     }</span>

实际上这个autoload()是没有考虑非核心文件的引入的。比如，在app文件夹经常会有自定义的一些重要文件夹，比如'application.utils.*（工具类），'application.filters.*'(过滤类)，'application.validators.*'（校验类）等。

在实际用的时候，是不用一个一个include的，直接new就可以了,yii已经帮我们做了include的工作。而这个工作就是在autoload()里面做的。

上面的代码很显然没有考虑非核心文件的引入，这是我的疏忽。

那yii是怎么帮我们引入非核心文件的？

这要从CApplication说起。

<span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">class</span> CApplication <span style="color: #0000ff;">extends</span><span style="color: #000000;"> CModule {    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> __construct(<span style="color: #800080;">$config</span> = <span style="color: #0000ff;">null</span><span style="color: #000000;">) {        </span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">is_string</span> ( <span style="color: #800080;">$config</span><span style="color: #000000;"> ))            </span><span style="color: #800080;">$config</span> = <span style="color: #0000ff;">require</span> (<span style="color: #800080;">$config</span><span style="color: #000000;">);        Yii</span>::setApplication ( <span style="color: #800080;">$this</span> );<span style="color: #008000;">//</span><span style="color: #008000;">保存整个app实例</span>        <span style="color: #0000ff;">if</span> (<span style="color: #0000ff;">isset</span> ( <span style="color: #800080;">$config</span> ['basePath'<span style="color: #000000;">] )) {            </span><span style="color: #800080;">$this</span>->setBasePath ( <span style="color: #800080;">$config</span> ['basePath'<span style="color: #000000;">] );            </span><span style="color: #0000ff;">unset</span> ( <span style="color: #800080;">$config</span> ['basePath'<span style="color: #000000;">] );        } </span><span style="color: #0000ff;">else</span>            <span style="color: #800080;">$this</span>->setBasePath ( 'protected'<span style="color: #000000;"> );        </span><span style="color: #008000;">//</span><span style="color: #008000;">设置别名,后面就可以用application表示basePath了</span>        Yii::setPathOfAlias ( 'application', <span style="color: #800080;">$this</span>-><span style="color: #000000;">getBasePath () );        </span><span style="color: #008000;">//</span><span style="color: #008000;">钩子，模块 预 初始化时执行，子类实现。不过这时，配置还没有写入框架</span>        <span style="color: #800080;">$this</span>-><span style="color: #000000;">preinit ();        </span><span style="color: #800080;">$this</span>-><span style="color: #000000;">registerCoreComponents ();        </span><span style="color: #008000;">//</span><span style="color: #008000;">父类实现</span>        <span style="color: #800080;">$this</span>->configure ( <span style="color: #800080;">$config</span><span style="color: #000000;"> );        </span><span style="color: #008000;">//</span><span style="color: #008000;">加载静态应用组件</span>        <span style="color: #800080;">$this</span>-><span style="color: #000000;">preloadComponents ();        </span><span style="color: #008000;">//</span><span style="color: #008000;">这才开始初始化模块</span>        <span style="color: #800080;">$this</span>-><span style="color: #000000;">init ();    }</span>

注意到里面的$this->configure ( $config );，$config是传入的配置文件，是一个数组，非核心文件的定义就是在这里面，比如引入工具类文件夹

<span style="color: #000000;">php</span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">array</span><span style="color: #000000;"> (    </span>'basePath' => <span style="color: #008080;">dirname</span> ( <span style="color: #ff00ff;">__FILE__</span> ) . DIRECTORY_SEPARATOR . '..',    'import' => <span style="color: #0000ff;">array</span><span style="color: #000000;"> (        </span>'application.utils.*'<span style="color: #000000;">    )    );</span>?> 

然后在父类CModule

    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> configure(<span style="color: #800080;">$config</span><span style="color: #000000;">) {        </span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">is_array</span> ( <span style="color: #800080;">$config</span><span style="color: #000000;"> )) {            </span><span style="color: #0000ff;">foreach</span> ( <span style="color: #800080;">$config</span> <span style="color: #0000ff;">as</span> <span style="color: #800080;">$key</span> => <span style="color: #800080;">$value</span><span style="color: #000000;"> )                </span><span style="color: #800080;">$this</span>-><span style="color: #800080;">$key</span> = <span style="color: #800080;">$value</span><span style="color: #000000;">;        }    }</span>

这里yii很"狡猾"，它在CModule的父类CComponent中重写了__set()

    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> __set(<span style="color: #800080;">$name</span>,<span style="color: #800080;">$value</span><span style="color: #000000;">)    {        </span><span style="color: #800080;">$setter</span>='set'.<span style="color: #800080;">$name</span><span style="color: #000000;">;        </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">method_exists</span>(<span style="color: #800080;">$this</span>,<span style="color: #800080;">$setter</span><span style="color: #000000;">))            </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$this</span>-><span style="color: #800080;">$setter</span>(<span style="color: #800080;">$value</span><span style="color: #000000;">);        </span><span style="color: #0000ff;">else</span>....<span style="color: #000000;">    }</span>

可以看到，如果CModule中如果有设置yii指定参数（比如import）的方法，就会调用它，而我之前裁剪的时候，把CModule中的setImport（）删掉了。

另外可以看到basePath, params, modules, import, components 是yii保留的参数名。

    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> setImport(<span style="color: #800080;">$aliases</span><span style="color: #000000;">)    {        </span><span style="color: #0000ff;">foreach</span>(<span style="color: #800080;">$aliases</span> <span style="color: #0000ff;">as</span> <span style="color: #800080;">$alias</span><span style="color: #000000;">)            Yii</span>::import(<span style="color: #800080;">$alias</span><span style="color: #000000;">);    }</span>

然后是YiiBase里面的import（）

    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">function</span> import(<span style="color: #800080;">$alias</span>, <span style="color: #800080;">$forceInclude</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">) {        </span><span style="color: #0000ff;">if</span> (<span style="color: #0000ff;">isset</span> ( self::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span>] )) <span style="color: #008000;">//</span><span style="color: #008000;">是否已经存在路径</span>            <span style="color: #0000ff;">return</span> self::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span><span style="color: #000000;">];                </span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">class_exists</span> ( <span style="color: #800080;">$alias</span>, <span style="color: #0000ff;">false</span> ) || <span style="color: #008080;">interface_exists</span> ( <span style="color: #800080;">$alias</span>, <span style="color: #0000ff;">false</span> ))<span style="color: #008000;">//</span><span style="color: #008000;">类是否已经定义,针对如urlManager这样的已定义于$_coreClasses[]的类</span>            <span style="color: #0000ff;">return</span> self::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span>] = <span style="color: #800080;">$alias</span><span style="color: #000000;">;        </span><span style="color: #0000ff;">if</span> ((<span style="color: #800080;">$pos</span> = <span style="color: #008080;">strrpos</span> ( <span style="color: #800080;">$alias</span>, '.' )) === <span style="color: #0000ff;">false</span>)         <span style="color: #008000;">//</span><span style="color: #008000;">直接是文件名</span><span style="color: #000000;">        {            </span><span style="color: #008000;">//</span><span style="color: #008000;"> try to autoload the class with an autoloader if $forceInclude is true</span>            <span style="color: #0000ff;">if</span> (<span style="color: #800080;">$forceInclude</span> && (Yii::autoload ( <span style="color: #800080;">$alias</span>, <span style="color: #0000ff;">true</span> ) || <span style="color: #008080;">class_exists</span> ( <span style="color: #800080;">$alias</span>, <span style="color: #0000ff;">true</span><span style="color: #000000;"> )))                self</span>::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span>] = <span style="color: #800080;">$alias</span><span style="color: #000000;">;            </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$alias</span><span style="color: #000000;">;        }                </span><span style="color: #800080;">$className</span> = ( <span style="color: #0000ff;">string</span> ) <span style="color: #008080;">substr</span> ( <span style="color: #800080;">$alias</span>, <span style="color: #800080;">$pos</span> + 1<span style="color: #000000;"> );        </span><span style="color: #800080;">$isClass</span> = <span style="color: #800080;">$className</span> !== '*'<span style="color: #000000;">;        </span><span style="color: #008000;">//</span><span style="color: #008000;">是否为路径+类名</span>        <span style="color: #0000ff;">if</span> (<span style="color: #800080;">$isClass</span> && (<span style="color: #008080;">class_exists</span> ( <span style="color: #800080;">$className</span>, <span style="color: #0000ff;">false</span> ) || <span style="color: #008080;">interface_exists</span> ( <span style="color: #800080;">$className</span>, <span style="color: #0000ff;">false</span><span style="color: #000000;"> )))            </span><span style="color: #0000ff;">return</span> self::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span>] = <span style="color: #800080;">$className</span><span style="color: #000000;">;        </span><span style="color: #008000;">//</span><span style="color: #008000;">获取真实路径</span>        <span style="color: #0000ff;">if</span> ((<span style="color: #800080;">$path</span> = self::getPathOfAlias ( <span style="color: #800080;">$alias</span> )) !== <span style="color: #0000ff;">false</span><span style="color: #000000;">) {            </span><span style="color: #008000;">//</span><span style="color: #008000;">是否以*结尾，如application.utils.*</span>            <span style="color: #0000ff;">if</span> (<span style="color: #800080;">$isClass</span><span style="color: #000000;">) {                </span><span style="color: #0000ff;">if</span> (<span style="color: #800080;">$forceInclude</span><span style="color: #000000;">) {                    </span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">is_file</span> ( <span style="color: #800080;">$path</span> . '.php'<span style="color: #000000;"> ))                        </span><span style="color: #0000ff;">require</span> (<span style="color: #800080;">$path</span> . '.php'<span style="color: #000000;">);                    </span><span style="color: #0000ff;">else</span>                        <span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CException ( Yii::t ( 'yii', 'Alias "{alias}" is invalid. Make sure it points to an existing PHP file and the file is readable.', <span style="color: #0000ff;">array</span><span style="color: #000000;"> (                                </span>'{alias}' => <span style="color: #800080;">$alias</span><span style="color: #000000;">                         ) ) );                    self</span>::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span>] = <span style="color: #800080;">$className</span><span style="color: #000000;">;                } </span><span style="color: #0000ff;">else</span><span style="color: #000000;">                    self</span>::<span style="color: #800080;">$classMap</span> [<span style="color: #800080;">$className</span>] = <span style="color: #800080;">$path</span> . '.php'<span style="color: #000000;">;                </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$className</span><span style="color: #000000;">;            } </span><span style="color: #0000ff;">else</span>             <span style="color: #008000;">//</span><span style="color: #008000;"> a directory</span><span style="color: #000000;">            {                </span><span style="color: #0000ff;">if</span> (self::<span style="color: #800080;">$_includePaths</span> === <span style="color: #0000ff;">null</span><span style="color: #000000;">) {                    self</span>::<span style="color: #800080;">$_includePaths</span> = <span style="color: #008080;">array_unique</span> ( <span style="color: #008080;">explode</span> ( PATH_SEPARATOR, <span style="color: #008080;">get_include_path</span><span style="color: #000000;"> () ) );                    </span><span style="color: #0000ff;">if</span> ((<span style="color: #800080;">$pos</span> = <span style="color: #008080;">array_search</span> ( '.', self::<span style="color: #800080;">$_includePaths</span>, <span style="color: #0000ff;">true</span> )) !== <span style="color: #0000ff;">false</span><span style="color: #000000;">)                        </span><span style="color: #0000ff;">unset</span> ( self::<span style="color: #800080;">$_includePaths</span> [<span style="color: #800080;">$pos</span><span style="color: #000000;">] );                }                                </span><span style="color: #008080;">array_unshift</span> ( self::<span style="color: #800080;">$_includePaths</span>, <span style="color: #800080;">$path</span><span style="color: #000000;"> );                                </span><span style="color: #0000ff;">if</span> (self::<span style="color: #800080;">$enableIncludePath</span> && <span style="color: #008080;">set_include_path</span> ( '.' . PATH_SEPARATOR . <span style="color: #008080;">implode</span> ( PATH_SEPARATOR, self::<span style="color: #800080;">$_includePaths</span> ) ) === <span style="color: #0000ff;">false</span><span style="color: #000000;">)                    self</span>::<span style="color: #800080;">$enableIncludePath</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;                </span><span style="color: #0000ff;">return</span> self::<span style="color: #800080;">$_imports</span> [<span style="color: #800080;">$alias</span>] = <span style="color: #800080;">$path</span><span style="color: #000000;">;            }        }    }</span>

 

一系列的判断，最后走到最后的else，将path写入到$_imports，这时仍然没有include.

include在autoload()

    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">function</span> autoload(<span style="color: #800080;">$className</span><span style="color: #000000;">)    {        </span><span style="color: #008000;">//</span><span style="color: #008000;"> use include so that the error PHP file may appear</span>        <span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">isset</span>(self::<span style="color: #800080;">$classMap</span>[<span style="color: #800080;">$className</span><span style="color: #000000;">]))            </span><span style="color: #0000ff;">include</span>(self::<span style="color: #800080;">$classMap</span>[<span style="color: #800080;">$className</span><span style="color: #000000;">]);        </span><span style="color: #0000ff;">elseif</span>(<span style="color: #0000ff;">isset</span>(self::<span style="color: #800080;">$_coreClasses</span>[<span style="color: #800080;">$className</span><span style="color: #000000;">]))            </span><span style="color: #0000ff;">include</span>(self::<span style="color: #800080;">$_coreClasses</span>[<span style="color: #800080;">$className</span><span style="color: #000000;">]);        </span><span style="color: #0000ff;">else</span><span style="color: #000000;">        {            </span><span style="color: #008000;">//</span><span style="color: #008000;"> include class file relying on include_path</span>            <span style="color: #0000ff;">if</span>(<span style="color: #008080;">strpos</span>(<span style="color: #800080;">$className</span>,'\\')===<span style="color: #0000ff;">false</span>)  <span style="color: #008000;">//</span><span style="color: #008000;"> class without namespace</span><span style="color: #000000;">            {                </span><span style="color: #0000ff;">if</span>(self::<span style="color: #800080;">$enableIncludePath</span>===<span style="color: #0000ff;">false</span><span style="color: #000000;">)                {                    </span><span style="color: #0000ff;">foreach</span>(self::<span style="color: #800080;">$_includePaths</span> <span style="color: #0000ff;">as</span> <span style="color: #800080;">$path</span><span style="color: #000000;">)                    {                        </span><span style="color: #800080;">$classFile</span>=<span style="color: #800080;">$path</span>.DIRECTORY_SEPARATOR.<span style="color: #800080;">$className</span>.'.php'<span style="color: #000000;">;                        </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_file</span>(<span style="color: #800080;">$classFile</span><span style="color: #000000;">))                        {                            </span><span style="color: #0000ff;">include</span>(<span style="color: #800080;">$classFile</span><span style="color: #000000;">);                            </span><span style="color: #0000ff;">break</span><span style="color: #000000;">;                        }                    }                }                </span><span style="color: #0000ff;">else</span>                    <span style="color: #0000ff;">include</span>(<span style="color: #800080;">$className</span>.'.php'<span style="color: #000000;">);            }            </span><span style="color: #0000ff;">return</span> <span style="color: #008080;">class_exists</span>(<span style="color: #800080;">$className</span>,<span style="color: #0000ff;">false</span>) || <span style="color: #008080;">interface_exists</span>(<span style="color: #800080;">$className</span>,<span style="color: #0000ff;">false</span><span style="color: #000000;">);        }        </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">true</span><span style="color: #000000;">;    }</span>

 

如果需要include的是非核心文件，那这里的$className只是一个alias,即文件名的前缀。

裁剪的yii http://files.cnblogs.com/TheViper/framework.zip

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