Initial Import

1 files changed, 237 insertions, 0 deletions

diff --git a/system/libraries/Hooks.php b/system/libraries/Hooks.php
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index 000000000..389e7ac14
--- /dev/null
+++ b/system/libraries/Hooks.php
@@ -0,0 +1,237 @@
+<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Code Igniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		Rick Ellis
+ * @copyright	Copyright (c) 2006, pMachine, Inc.
+ * @license		http://www.codeignitor.com/user_guide/license.html 
+ * @link		http://www.codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+ 
+// ------------------------------------------------------------------------
+
+/**
+ * Code Igniter Hooks Class
+ *
+ * Provides a mechanism to extend the base system without hacking.  Most of
+ * this class is borrowed from Paul's Extension class in ExpressionEngine.
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Libraries
+ * @author		Rick Ellis
+ * @link		http://www.codeigniter.com/user_guide/libraries/encryption.html
+ */
+class CI_Hooks {
+	
+	var $enabled 		= FALSE;
+	var $hooks   		= array();
+	var $in_progress	= FALSE;
+	
+	/**
+	 * Constructor
+	 *
+	 */
+	function CI_Hooks()
+	{
+		log_message('debug', "Hooks Class Initialized");
+	
+		$CFG =& _load_class('CI_Config');
+		
+		// If hooks are not enabled in the config file
+		// there is nothing else to do
+		
+		if ($CFG->item('enable_hooks') == FALSE)
+		{
+			return;
+		}
+		
+		// Grab the "hooks" definition file.
+		// If there are no hooks, we're done.
+		
+		@include(APPPATH.'config/hooks'.EXT);
+		
+		if ( ! isset($hook) OR ! is_array($hook))
+		{
+			return;
+		}
+
+		$this->hooks =& $hook;
+		$this->enabled = TRUE;
+	}
+  	// END CI_Hooks()
+  	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Does a given hook exist?
+	 *
+	 * Returns TRUE/FALSE based on whether a given hook exists
+	 *
+	 * @access	private
+	 * @param	string
+	 * @return	bool
+	 */
+	function _hook_exists($which = '')
+	{
+		if ( ! $this->enabled)
+		{
+			return FALSE;
+		}
+
+		if ( ! isset($this->hooks[$which]))
+		{
+			return FALSE;
+		}
+
+		return TRUE;
+	}
+  	// END hook_exists()
+  	
+  	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Call Hook
+	 *
+	 * Calls a particular hook
+	 *
+	 * @access	private
+	 * @param	string	the hook name
+	 * @return	mixed
+	 */
+	function _call_hook($which = '')
+	{
+		if (isset($this->hooks[$which][0]) AND is_array($this->hooks[$which][0]))
+		{
+			foreach ($this->hooks[$which] as $val)
+			{
+				$this->_run_hook($val);
+			}
+		}
+		else
+		{
+			$this->_run_hook($this->hooks[$which]);
+		}
+	}
+  	// END hook_exists()
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Run Hook
+	 *
+	 * Runs a particular hook
+	 *
+	 * @access	private
+	 * @param	array	the hook details
+	 * @return	bool
+	 */
+	function _run_hook($data)
+	{
+		if ( ! is_array($data))
+		{
+			return FALSE;
+		}
+		
+		// -----------------------------------
+		// Safety - Prevents run-away loops
+		// -----------------------------------
+	
+		// If the script being called happens to have the same 
+		// extension call within it a loop can happen
+		
+		if ($this->in_progress == TRUE)
+		{
+			return;
+		}
+
+		// -----------------------------------
+		// Set file path
+		// -----------------------------------
+		
+		if ( ! isset($data['filepath']) OR ! isset($data['filename']))
+		{
+			return FALSE;
+		}
+		
+		$filepath = APPPATH.$data['filepath'].'/'.$data['filename'];
+	
+		if ( ! file_exists($filepath))
+		{
+			return FALSE;
+		}
+		
+		// -----------------------------------
+		// Set class/function name
+		// -----------------------------------
+		
+		$class		= FALSE;
+		$function	= FALSE;
+		$params		= '';
+		
+		if (isset($data['class']) AND $data['class'] != '') 
+		{
+			$class = $data['class'];
+		}
+
+		if (isset($data['function'])) 
+		{
+			$function = $data['function'];
+		}
+
+		if (isset($data['params'])) 
+		{
+			$params = $data['params'];
+		}
+		
+		if ($class === FALSE AND $function === FALSE)
+		{
+			return FALSE;
+		}
+		
+		// -----------------------------------
+		// Set the in_progress flag
+		// -----------------------------------
+
+		$this->in_progress = TRUE;
+		
+		// -----------------------------------
+		// Call the requested class and/or function
+		// -----------------------------------
+		
+		if ($class !== FALSE)
+		{
+			if ( ! class_exists($class))
+			{
+				require($filepath);
+			}
+		
+			$HOOK = new $class;
+			$HOOK->$function($params);
+		}
+		else
+		{
+			if ( ! function_exists($function))
+			{
+				require($filepath);
+			}
+		
+			$function($params);
+		}
+	
+		$this->in_progress = FALSE;
+		return TRUE;
+	}
+  	// END _run_hook()
+
+
+}
+
+// END CI_Hooks class
+?>
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