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File: /www/wwwroot/bb.cwoyt.com/ThinkPHP/Library/Think/Route.class.php
<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2013 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Think;
/**
 * ThinkPHP路由解析类
 */
class Route {
    
    // 路由检测
    public static function check(){
        $depr   =   C('URL_PATHINFO_DEPR');
        $regx   =   trim($_SERVER['PATH_INFO'],$depr);
        // 分隔符替换 确保路由定义使用统一的分隔符
        if('/' != $depr){
            $regx = str_replace($depr,'/',$regx);
        }
        // URL映射定义(静态路由)
        $maps   =   C('URL_MAP_RULES');
        if(isset($maps[$regx])) {
            $var    =   self::parseUrl($maps[$regx]);
            $_GET   =   array_merge($var, $_GET);
            return true;                
        }        
        // 动态路由处理
        $routes =   C('URL_ROUTE_RULES');
        if(!empty($routes)) {
            foreach ($routes as $rule=>$route){
                if(0===strpos($rule,'/') && preg_match($rule,$regx,$matches)) { // 正则路由
                    if($route instanceof \Closure) {
                        // 执行闭包并中止
                        self::invokeRegx($route, $matches);
                        exit;
                    }
                    return self::parseRegex($matches,$route,$regx);
                }else{ // 规则路由
                    $len1   =   substr_count($regx,'/');
                    $len2   =   substr_count($rule,'/');
                    if($len1>=$len2) {
                        if('$' == substr($rule,-1,1)) {// 完整匹配
                            if($len1 != $len2) {
                                continue;
                            }else{
                                $rule =  substr($rule,0,-1);
                            }
                        }
                        $match  =  self::checkUrlMatch($regx,$rule);
                        if(false !== $match)  {
                            if($route instanceof \Closure) {
                                // 执行闭包并中止
                                self::invokeRule($route, $match);
                                exit;
                            }
                            return self::parseRule($rule,$route,$regx);
                        }
                    }
                }
            }
        }
        return false;
    }

    // 检测URL和规则路由是否匹配
    private static function checkUrlMatch($regx,$rule) {
        $m1 = explode('/',$regx);
        $m2 = explode('/',$rule);
        $var = array();         
        foreach ($m2 as $key=>$val){
            if(':' == substr($val,0,1)) {// 动态变量
                if(strpos($val,'\\')) {
                    $type = substr($val,-1);
                    if('d'==$type && !is_numeric($m1[$key])) {
                        return false;
                    }
                    $name = substr($val, 1, -2);
                }elseif($pos = strpos($val,'^')){
                    $array   =  explode('|',substr(strstr($val,'^'),1));
                    if(in_array($m1[$key],$array)) {
                        return false;
                    }
                    $name = substr($val, 1, $pos - 1);
                }else{
                    $name = substr($val, 1);
                }
                $var[$name] = $m1[$key];
            }elseif(0 !== strcasecmp($val,$m1[$key])){
                return false;
            }
        }
        // 成功匹配后返回URL中的动态变量数组
        return $var;
    }

    // 解析规范的路由地址
    // 地址格式 [控制器/操作?]参数1=值1&参数2=值2...
    private static function parseUrl($url) {
        $var  =  array();
        if(false !== strpos($url,'?')) { // [控制器/操作?]参数1=值1&参数2=值2...
            $info   =  parse_url($url);
            $path   = explode('/',$info['path']);
            parse_str($info['query'],$var);
        }elseif(strpos($url,'/')){ // [控制器/操作]
            $path = explode('/',$url);
        }else{ // 参数1=值1&参数2=值2...
            parse_str($url,$var);
        }
        if(isset($path)) {
            $var[C('VAR_ACTION')] = array_pop($path);
            if(!empty($path)) {
                $var[C('VAR_CONTROLLER')] = array_pop($path);
            }
            if(!empty($path)) {
                $var[C('VAR_MODULE')]  = array_pop($path);
            }
        }
        return $var;
    }

    // 解析规则路由
    // '路由规则'=>'[控制器/操作]?额外参数1=值1&额外参数2=值2...'
    // '路由规则'=>array('[控制器/操作]','额外参数1=值1&额外参数2=值2...')
    // '路由规则'=>'外部地址'
    // '路由规则'=>array('外部地址','重定向代码')
    // 路由规则中 :开头 表示动态变量
    // 外部地址中可以用动态变量 采用 :1 :2 的方式
    // 'news/:month/:day/:id'=>array('News/read?cate=1','status=1'),
    // 'new/:id'=>array('/new.php?id=:1',301), 重定向
    private static function parseRule($rule,$route,$regx) {
        // 获取路由地址规则
        $url   =  is_array($route)?$route[0]:$route;
        // 获取URL地址中的参数
        $paths = explode('/',$regx);
        // 解析路由规则
        $matches  =  array();
        $rule =  explode('/',$rule);
        foreach ($rule as $item){
            if(0===strpos($item,':')) { // 动态变量获取
                if($pos = strpos($item,'^') ) {
                    $var  =  substr($item,1,$pos-1);
                }elseif(strpos($item,'\\')){
                    $var  =  substr($item,1,-2);
                }else{
                    $var  =  substr($item,1);
                }
                $matches[$var] = array_shift($paths);
            }else{ // 过滤URL中的静态变量
                array_shift($paths);
            }
        }

        if(0=== strpos($url,'/') || 0===strpos($url,'http')) { // 路由重定向跳转
            if(strpos($url,':')) { // 传递动态参数
                $values = array_values($matches);
                $url = preg_replace_callback('/:(\d+)/', function($match) use($values){ return $values[$match[1] - 1]; }, $url);
            }
            header("Location: $url", true,(is_array($route) && isset($route[1]))?$route[1]:301);
            exit;
        }else{
            // 解析路由地址
            $var  =  self::parseUrl($url);
            // 解析路由地址里面的动态参数
            $values  =  array_values($matches);
            foreach ($var as $key=>$val){
                if(0===strpos($val,':')) {
                    $var[$key] =  $values[substr($val,1)-1];
                }
            }
            $var   =   array_merge($matches,$var);
            // 解析剩余的URL参数
            if(!empty($paths)) {
                preg_replace_callback('/(\w+)\/([^\/]+)/', function($match) use(&$var){ $var[strtolower($match[1])]=strip_tags($match[2]);}, implode('/',$paths));
            }
            // 解析路由自动传入参数
            if(is_array($route) && isset($route[1])) {
                parse_str($route[1],$params);
                $var   =   array_merge($var,$params);
            }
            $_GET   =  array_merge($var,$_GET);
        }
        return true;
    }

    // 解析正则路由
    // '路由正则'=>'[控制器/操作]?参数1=值1&参数2=值2...'
    // '路由正则'=>array('[控制器/操作]?参数1=值1&参数2=值2...','额外参数1=值1&额外参数2=值2...')
    // '路由正则'=>'外部地址'
    // '路由正则'=>array('外部地址','重定向代码')
    // 参数值和外部地址中可以用动态变量 采用 :1 :2 的方式
    // '/new\/(\d+)\/(\d+)/'=>array('News/read?id=:1&page=:2&cate=1','status=1'),
    // '/new\/(\d+)/'=>array('/new.php?id=:1&page=:2&status=1','301'), 重定向
    private static function parseRegex($matches,$route,$regx) {
        // 获取路由地址规则
        $url   =  is_array($route)?$route[0]:$route;
        $url   =  preg_replace_callback('/:(\d+)/', function($match) use($matches){return $matches[$match[1]];}, $url); 
        if(0=== strpos($url,'/') || 0===strpos($url,'http')) { // 路由重定向跳转
            header("Location: $url", true,(is_array($route) && isset($route[1]))?$route[1]:301);
            exit;
        }else{
            // 解析路由地址
            $var  =  self::parseUrl($url);
            // 解析剩余的URL参数
            $regx =  substr_replace($regx,'',0,strlen($matches[0]));
            if($regx) {
                preg_replace_callback('/(\w+)\/([^\/]+)/', function($match) use(&$var){$var[strtolower($match[1])]=strip_tags($match[2]);}, $regx);
            }
            // 解析路由自动传入参数
            if(is_array($route) && isset($route[1])) {
                parse_str($route[1],$params);
                $var   =   array_merge($var,$params);
            }
            $_GET   =  array_merge($var,$_GET);
        }
        return true;
    }

    // 执行正则匹配下的闭包方法 支持参数调用
    static private function invokeRegx($closure, $var = array()) {
        $reflect = new \ReflectionFunction($closure);
        $params  = $reflect->getParameters();
        $args    = array();
        array_shift($var);
        foreach ($params as $param){
            if(!empty($var)) {
                $args[] = array_shift($var);
            }elseif($param->isDefaultValueAvailable()){
                $args[] = $param->getDefaultValue();
            }
        }
        $reflect->invokeArgs($args);
    }

    // 执行规则匹配下的闭包方法 支持参数调用
    static private function invokeRule($closure, $var = array()) {
        $reflect = new \ReflectionFunction($closure);
        $params  = $reflect->getParameters();
        $args    = array();
        foreach ($params as $param){
            $name = $param->getName();
            if(isset($var[$name])) {
                $args[] = $var[$name];
            }elseif($param->isDefaultValueAvailable()){
                $args[] = $param->getDefaultValue();
            }
        }
        $reflect->invokeArgs($args);
    }
}