Router.php

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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2006, EllisLab, Inc.
 * @license             http://codeigniter.com/user_guide/license.html
 * @link                http://codeigniter.com
 * @since               Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Router Class
 *
 * Parses URIs and determines routing
 *
 * @package             CodeIgniter
 * @subpackage  Libraries
 * @author              ExpressionEngine Dev Team
 * @category    Libraries
 * @link                http://codeigniter.com/user_guide/general/routing.html
 */
class CI_Router {

        var $config;    
        var $routes             = array();
        var $error_routes       = array();
        var $class                      = '';
        var $method                     = 'index';
        var $directory          = '';
        var $uri_protocol       = 'auto';
        var $default_controller;
        var $scaffolding_request = FALSE; // Must be set to FALSE
        
        /**
         * Constructor
         *
         * Runs the route mapping function.
         */
        function CI_Router()
        {
                $this->config =& load_class('Config');
                $this->uri =& load_class('URI');
                $this->_set_routing();
                log_message('debug', "Router Class Initialized");
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Set the route mapping
         *
         * This function determines what should be served based on the URI request,
         * as well as any "routes" that have been set in the routing config file.
         *
         * @access      private
         * @return      void
         */
        function _set_routing()
        {               
                // Are query strings enabled in the config file?
                // If so, we're done since segment based URIs are not used with query strings.
                if ($this->config->item('enable_query_strings') === TRUE AND isset($_GET[$this->config->item('controller_trigger')]))
                {
                        $this->set_class(trim($this->uri->_filter_uri($_GET[$this->config->item('controller_trigger')])));

                        if (isset($_GET[$this->config->item('function_trigger')]))
                        {
                                $this->set_method(trim($this->uri->_filter_uri($_GET[$this->config->item('function_trigger')])));
                        }
                        
                        return;
                }
                
                // Load the routes.php file.
                @include(APPPATH.'config/routes'.EXT);
                $this->routes = ( ! isset($route) OR ! is_array($route)) ? array() : $route;
                unset($route);

                // Set the default controller so we can display it in the event
                // the URI doesn't correlated to a valid controller.
                $this->default_controller = ( ! isset($this->routes['default_controller']) OR $this->routes['default_controller'] == '') ? FALSE : strtolower($this->routes['default_controller']);     
                
                // Fetch the complete URI string
                $this->uri->_fetch_uri_string();
        
                // Is there a URI string? If not, the default controller specified in the "routes" file will be shown.
                if ($this->uri->uri_string == '')
                {
                        if ($this->default_controller === FALSE)
                        {
                                show_error("Unable to determine what should be displayed. A default route has not been specified in the routing file.");
                        }
                
                        $this->set_class($this->default_controller);
                        $this->set_method('index');
                        $this->_set_request(array($this->default_controller, 'index'));
                        
                        // re-index the routed segments array so it starts with 1 rather than 0
                        $this->uri->_reindex_segments();
                        
                        log_message('debug', "No URI present. Default controller set.");
                        return;
                }
                unset($this->routes['default_controller']);
                
                // Do we need to remove the URL suffix?
                $this->uri->_remove_url_suffix();
                
                // Compile the segments into an array
                $this->uri->_explode_segments();
                
                // Parse any custom routing that may exist
                $this->_parse_routes();         
                
                // Re-index the segment array so that it starts with 1 rather than 0
                $this->uri->_reindex_segments();
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Set the Route
         *
         * This function takes an array of URI segments as
         * input, and sets the current class/method
         *
         * @access      private
         * @param       array
         * @param       bool
         * @return      void
         */
        function _set_request($segments = array())
        {       
                $segments = $this->_validate_request($segments);
                
                if (count($segments) == 0)
                {
                        return;
                }
                                                
                $this->set_class($segments[0]);
                
                if (isset($segments[1]))
                {
                        // A scaffolding request. No funny business with the URL
                        if ($this->routes['scaffolding_trigger'] == $segments[1] AND $segments[1] != '_ci_scaffolding')
                        {
                                $this->scaffolding_request = TRUE;
                                unset($this->routes['scaffolding_trigger']);
                        }
                        else
                        {
                                // A standard method request
                                $this->set_method($segments[1]);
                        }
                }
                else
                {
                        // This lets the "routed" segment array identify that the default
                        // index method is being used.
                        $segments[1] = 'index';
                }
                
                // Update our "routed" segment array to contain the segments.
                // Note: If there is no custom routing, this array will be
                // identical to $this->uri->segments
                $this->uri->rsegments = $segments;
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Validates the supplied segments.  Attempts to determine the path to
         * the controller.
         *
         * @access      private
         * @param       array
         * @return      array
         */     
        function _validate_request($segments)
        {
                // Does the requested controller exist in the root folder?
                if (file_exists(APPPATH.'controllers/'.$segments[0].EXT))
                {
                        return $segments;
                }

                // Is the controller in a sub-folder?
                if (is_dir(APPPATH.'controllers/'.$segments[0]))
                {               
                        // Set the directory and remove it from the segment array
                        $this->set_directory($segments[0]);
                        $segments = array_slice($segments, 1);
                        
                        if (count($segments) > 0)
                        {
                                // Does the requested controller exist in the sub-folder?
                                if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$segments[0].EXT))
                                {
                                        show_404($this->fetch_directory().$segments[0]);
                                }
                        }
                        else
                        {
                                $this->set_class($this->default_controller);
                                $this->set_method('index');
                        
                                // Does the default controller exist in the sub-folder?
                                if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$this->default_controller.EXT))
                                {
                                        $this->directory = '';
                                        return array();
                                }
                        
                        }

                        return $segments;
                }

                // Can't find the requested controller...
                show_404($segments[0]);
        }

        // --------------------------------------------------------------------

        /**
         *  Parse Routes
         *
         * This function matches any routes that may exist in
         * the config/routes.php file against the URI to
         * determine if the class/method need to be remapped.
         *
         * @access      private
         * @return      void
         */
        function _parse_routes()
        {
                // Do we even have any custom routing to deal with?
                // There is a default scaffolding trigger, so we'll look just for 1
                if (count($this->routes) == 1)
                {
                        $this->_set_request($this->uri->segments);
                        return;
                }

                // Turn the segment array into a URI string
                $uri = implode('/', $this->uri->segments);

                // Is there a literal match?  If so we're done
                if (isset($this->routes[$uri]))
                {
                        $this->_set_request(explode('/', $this->routes[$uri]));         
                        return;
                }
                                
                // Loop through the route array looking for wild-cards
                foreach ($this->routes as $key => $val)
                {                                               
                        // Convert wild-cards to RegEx
                        $key = str_replace(':any', '.+', str_replace(':num', '[0-9]+', $key));
                        
                        // Does the RegEx match?
                        if (preg_match('#^'.$key.'$#', $uri))
                        {                       
                                // Do we have a back-reference?
                                if (strpos($val, '$') !== FALSE AND strpos($key, '(') !== FALSE)
                                {
                                        $val = preg_replace('#^'.$key.'$#', $val, $uri);
                                }
                        
                                $this->_set_request(explode('/', $val));                
                                return;
                        }
                }

                // If we got this far it means we didn't encounter a
                // matching route so we'll set the site default route
                $this->_set_request($this->uri->segments);
        }

        // --------------------------------------------------------------------
        
        /**
         * Set the class name
         *
         * @access      public
         * @param       string
         * @return      void
         */     
        function set_class($class)
        {
                $this->class = $class;
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Fetch the current class
         *
         * @access      public
         * @return      string
         */     
        function fetch_class()
        {
                return $this->class;
        }
        
        // --------------------------------------------------------------------
        
        /**
         *  Set the method name
         *
         * @access      public
         * @param       string
         * @return      void
         */     
        function set_method($method)
        {
                $this->method = $method;
        }

        // --------------------------------------------------------------------
        
        /**
         *  Fetch the current method
         *
         * @access      public
         * @return      string
         */     
        function fetch_method()
        {
                if ($this->method == $this->fetch_class())
                {
                        return 'index';
                }

                return $this->method;
        }

        // --------------------------------------------------------------------
        
        /**
         *  Set the directory name
         *
         * @access      public
         * @param       string
         * @return      void
         */     
        function set_directory($dir)
        {
                $this->directory = $dir.'/';
        }

        // --------------------------------------------------------------------
        
        /**
         *  Fetch the sub-directory (if any) that contains the requested controller class
         *
         * @access      public
         * @return      string
         */     
        function fetch_directory()
        {
                return $this->directory;
        }

}
// END Router Class

/* End of file Router.php */
/* Location: ./system/libraries/Router.php */