summaryrefslogtreecommitdiffstats
path: root/system/libraries/Loader.php
blob: 90d824049f6fbc949a8c188af2ecf5b1be5fd79c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
<?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
 */
 
// ------------------------------------------------------------------------

/**
 * Loader Class
 * 
 * Loads views and files
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @author		Rick Ellis
 * @category	Loader
 * @link		http://www.codeigniter.com/user_guide/libraries/loader.html
 */
class CI_Loader {

	var $ob_level;
	var $cached_vars	= array();
	var $helpers		= array();
	var $plugins		= array();
	var $scripts		= array();
	var $languages		= array();
	var $view_path		= '';

	/**
	 * Constructor
	 *
	 * Sets the path to the view files and gets the initial output
	 * buffering level
	 *
	 * @access	public
	 */
	function CI_Loader()
	{
		$this->view_path = APPPATH.'views/';
		$this->ob_level = ob_get_level();
				
		log_message('debug', "Loader Class Initialized");
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Class Loader
	 *
	 * This function lets users load and instantiate classes.
	 * It is designed to be called from a user's app controllers.
	 *
	 * @access	public
	 * @param	string	the name of the class
	 * @param	mixed	any initialization parameters
	 * @return	void
	 */	
	function library($class, $param = NULL)
	{		
		if ($class == '')
			return;
	
		$obj =& get_instance();
		$obj->_ci_init_class($class, $param);
		$obj->_ci_assign_to_models();
	}

	// --------------------------------------------------------------------
	
	/**
	 * Model Loader
	 *
	 * This function lets users load and instantiate models.
	 *
	 * @access	public
	 * @param	string	the name of the class
	 * @param	mixed	any initialization parameters
	 * @return	void
	 */	
	function model($model, $name = '', $db_conn = FALSE)
	{		
		if ($model == '')
			return;
	
		$obj =& get_instance();
		$obj->_ci_init_model($model, $name, $db_conn);
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Database Loader
	 *
	 * @access	public
	 * @param	string	the DB credentials
	 * @param	bool	whether to return the DB object
	 * @param	bool	whether to enable active record (this allows us to override the config setting)
	 * @return	object
	 */	
	function database($db = '', $return = FALSE, $active_record = FALSE)
	{
		$obj =& get_instance();
	
		if ($return === TRUE)
		{
			return $obj->_ci_init_database($db, TRUE, $active_record);
		}
		else
		{
			$obj->_ci_init_database($db, FALSE, $active_record);
			$obj->_ci_assign_to_models();			
		}
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Database Utiliy Loader
	 *
	 * @access	public
	 * @return	object
	 */	
	function dbutil()
	{
		$obj =& get_instance();
		$obj->_ci_init_dbextra('dbutil');
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Database Export Loader
	 *
	 * @access	public
	 * @return	object
	 */	
	function dbexport()
	{
		$obj =& get_instance();
		$obj->_ci_init_dbextra('dbexport');
	}

	// --------------------------------------------------------------------
	
	/**
	 * Scaffolding Loader
	 *
	 * @access	public
	 * @param	string
	 * @return	void
	 */	
	function scaffolding($table = '')
	{		
		if ($table == FALSE)
		{
			show_error('You must include the name of the table you would like access when you initialize scaffolding');
		}
		
		$obj =& get_instance();
		$obj->_ci_init_scaffolding($table);
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load View
	 *
	 * This function is used to load a "view" file.  It has three parameters:
	 *
	 * 1. The name of the "view" file to be included.
	 * 2. An associative array of data to be extracted for use in the view.
	 * 3. TRUE/FALSE - whether to return the data or load it.  In
	 * some cases it's advantageous to be able to retun data so that
	 * a developer can process it in some way.
	 *
	 * @access	public
	 * @param	string
	 * @param	array
	 * @param	bool
	 * @return	void
	 */
	function view($view, $vars = array(), $return = FALSE)
	{
		return $this->_ci_load(array('view' => $view, 'vars' => $this->_ci_object_to_array($vars), 'return' => $return));
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load File
	 *
	 * This is a generic file loader
	 *
	 * @access	public
	 * @param	string
	 * @param	bool
	 * @return	string
	 */
	function file($path, $return = FALSE)
	{
		return $this->_ci_load(array('path' => $path, 'return' => $return));
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Set Variables
	 *
	 * Once variables are set they become availabe within
	 * the controller class and its "view" files.
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function vars($vars = array())
	{
		$vars = $this->_ci_object_to_array($vars);
	
		if (is_array($vars) AND count($vars) > 0)
		{
			foreach ($vars as $key => $val)
			{
				$this->cached_vars[$key] = $val;
			}
		}
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load Helper
	 *
	 * This function loads the specified helper file.
	 *
	 * @access	public
	 * @param	mixed
	 * @return	void
	 */
	function helper($helpers = array())
	{
		if ( ! is_array($helpers))
		{
			$helpers = array($helpers);
		}
	
		foreach ($helpers as $helper)
		{
			if (isset($this->helpers[$helper]))
			{
				continue;
			}
		
			$helper = strtolower(str_replace(EXT, '', str_replace('_helper', '', $helper)).'_helper');
		
			if (file_exists(APPPATH.'helpers/'.$helper.EXT))
			{
				include_once(APPPATH.'helpers/'.$helper.EXT);
			}
			else
			{		
				if (file_exists(BASEPATH.'helpers/'.$helper.EXT))
				{
					include_once(BASEPATH.'helpers/'.$helper.EXT);
				}
				else
				{
					show_error('Unable to load the requested file: helpers/'.$helper.EXT);
				}
			}

			$this->helpers[$helper] = TRUE;
		}
		
		log_message('debug', 'Helpers loaded: '.implode(', ', $helpers));
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load Helpers
	 *
	 * This is simply an alias to the above function in case the
	 * user has written the plural form of this function.
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function helpers($helpers = array())
	{
		$this->helper($helpers);
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load Plugin
	 *
	 * This function loads the specified plugin.
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function plugin($plugins = array())
	{
		if ( ! is_array($plugins))
		{
			$plugins = array($plugins);
		}
	
		foreach ($plugins as $plugin)
		{
			if (isset($this->plugins[$plugin]))
			{
				continue;
			}
	
			$plugin = strtolower(str_replace(EXT, '', str_replace('_plugin.', '', $plugin)).'_pi');		
		
			if (file_exists(APPPATH.'plugins/'.$plugin.EXT))
			{
				include_once(APPPATH.'plugins/'.$plugin.EXT);	
			}
			else
			{
				if (file_exists(BASEPATH.'plugins/'.$plugin.EXT))
				{
					include_once(BASEPATH.'plugins/'.$plugin.EXT);	
				}
				else
				{
					show_error('Unable to load the requested file: plugins/'.$plugin.EXT);
				}
			}
			
			$this->plugins[$plugin] = TRUE;
		}
		
		log_message('debug', 'Plugins loaded: '.implode(', ', $plugins));
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load Script
	 *
	 * This function loads the specified include file from the
	 * application/scripts/ folder.
	 *
	 * NOTE:  This feature has been deprecated but it will remain available
	 * for legacy users.
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function script($scripts = array())
	{
		if ( ! is_array($scripts))
		{
			$scripts = array($scripts);
		}
	
		foreach ($scripts as $script)
		{
			if (isset($this->scripts[$script]))
			{
				continue;
			}
	
			$script = strtolower(str_replace(EXT, '', $script));
		
			if ( ! file_exists(APPPATH.'scripts/'.$script.EXT))
			{
				show_error('Unable to load the requested script: scripts/'.$script.EXT);
			}
			
			include_once(APPPATH.'scripts/'.$script.EXT);
			
			$this->scripts[$script] = TRUE;
		}
		
		log_message('debug', 'Scripts loaded: '.implode(', ', $scripts));
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Load Plugins
	 *
	 * This is simply an alias to the above function in case the
	 * user has written the plural form of this function.
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function plugins($plugins = array())
	{
		$this->plugin($plugins);
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Loads a language file
	 *
	 * @access	public
	 * @param	string
	 * @return	void
	 */
	function language($file = '', $lang = '', $return = FALSE)
	{
		$obj =& get_instance();
		return $obj->lang->load($file, $lang, $return);
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Loads a config file
	 *
	 * @access	public
	 * @param	string
	 * @return	void
	 */
	function config($file = '')
	{
		$obj =& get_instance();
		$obj->config->load($file);
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Set the Path to the "views" folder
	 *
	 * @access	private
	 * @param	string
	 * @return	void
	 */
	function _ci_set_view_path($path)
	{
		$this->view_path = $path;
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Loader
	 *
	 * This function isn't called directly.  It's called from
	 * the two functions above.  It's used to load views and files
	 *
	 * @access	private
	 * @param	array
	 * @return	void
	 */
	function _ci_load($data)
	{
		// This allows anything loaded using $this->load (viwes, files, etc.)
		// to become accessible from within the Controller and Model functions.
		$obj =& get_instance();
		foreach (get_object_vars($obj) as $key => $var)
		{
			if (is_object($var))
			{
				$this->$key =& $obj->$key;
			}
		}
				
		// Set the default data variables
		foreach (array('view', 'vars', 'path', 'return') as $val)
		{
			$$val = ( ! isset($data[$val])) ? FALSE : $data[$val];
		}
		
		/*
		 * Extract and cache variables
		 *
		 * You can either set variables using the dedicated $this->load_vars() 
		 * function or via the second parameter of this function. We'll merge 
		 * the two types and cache them so that views that are embedded within 
		 * other views can have access to these variables.
		 */	
		if (is_array($vars))
		{
			$this->cached_vars = array_merge($this->cached_vars, $vars);
		}
		extract($this->cached_vars);
				
		// Set the path to the requested file
		if ($path == '')
		{
			$ext = pathinfo($view, PATHINFO_EXTENSION);
			$file = ($ext == '') ? $view.EXT : $view;
			$path = $this->view_path.$file;
		}
		else
		{
			$x = explode('/', $path);
			$file = end($x);
		}

		/*
		 * Buffer the output
		 *
		 * We buffer the output for two reasons:
		 * 1. Speed. You get a significant speed boost.
		 * 2. So that the final rendered template can be 
		 * post-processed by the output class.  Why do we
		 * need post processing?  For one thing, in order to 
		 * show the elapsed page load time.  Unless we
		 * can intercept the content right before it's sent to
		 * the browser and then stop the timer it won't be acurate.
		 */
		if ( ! file_exists($path))
		{
			show_error('Unable to load the requested file: '.$file);
		}

		ob_start();
		
		include($path);
		log_message('debug', 'File loaded: '.$path);
		
		// Return the file data if requested to
		if ($return === TRUE)
		{		
			$buffer = ob_get_contents();
			ob_end_clean(); 
			
			return $buffer;
		}

		/*
		 * Flush the buffer... or buff the flusher?
		 *
		 * In order to permit views to be nested within
		 * other views, we need to flush the content back out whenever 
		 * we are beyond the first level of output buffering so that 
		 * it can be seen and included  properly by the first included 
		 * template and any subsequent ones. Oy!
		 *
		 */		
		if (ob_get_level() > $this->ob_level + 1)
		{
			ob_end_flush();
		}
		else
		{
			$obj->output->set_output(ob_get_contents());
			ob_end_clean();
		}
	}
	
	// --------------------------------------------------------------------
	
	/**
	 * Autoloader
	 *
	 * The config/autoload.php file contains an array that permits sub-systems, 
	 * plugins, and helpers to be loaded automatically.
	 *
	 * @access	private
	 * @param	array
	 * @return	void
	 */
	function _ci_autoloader($autoload)
	{
		if ($autoload === FALSE)
		{
			return;
		}
	
		foreach (array('helper', 'plugin', 'script') as $type)
		{
			if (isset($autoload[$type]))
			{
				$this->$type($autoload[$type]);
			}
		}
	}

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

	/**
	 * Object to Array
	 *
	 * Takes an object as input and convers the class variables to array key/vals
	 *
	 * @access	public
	 * @param	object
	 * @return	array
	 */
	function _ci_object_to_array($object)
	{
		return (is_object($object)) ? get_object_vars($object) : $object;
	}
	
}
?>