Source

CodeIgniter Reactor / system / core / Loader.php

Full commit
   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
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

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

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

	// All these are set automatically. Don't mess with them.
	protected $_ci_ob_level;
	protected $_ci_view_paths		= array();
	protected $_ci_library_paths	= array();
	protected $_ci_model_paths		= array();
	protected $_ci_helper_paths		= array();
	protected $_base_classes		= array(); // Set by the controller class
	protected $_ci_cached_vars		= array();
	protected $_ci_classes			= array();
	protected $_ci_loaded_files		= array();
	protected $_ci_models			= array();
	protected $_ci_helpers			= array();
	protected $_ci_varmap			= array('unit_test' => 'unit',
											'user_agent' => 'agent');

	/**
	 * Constructor
	 *
	 * Sets the path to the view files and gets the initial output buffering level
	 */
	public function __construct()
	{
		$this->_ci_ob_level = ob_get_level();
		$this->_ci_library_paths = array(APPPATH, BASEPATH);
		$this->_ci_helper_paths = array(APPPATH, BASEPATH);
		$this->_ci_model_paths = array(APPPATH);
		$this->_ci_view_paths = array(APPPATH.'views/'	=> TRUE);

		log_message('debug', "Loader Class Initialized");
	}

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

	/**
	 * Set _base_classes variable
	 *
	 * This method is called once in CI_Controller.
	 *
	 * @param 	array
	 * @return 	object
	 */
	public function set_base_classes()
	{
		$this->_base_classes =& is_loaded();

		return $this;
	}

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

	/**
	 * Is Loaded
	 *
	 * A utility function to test if a class is in the self::$_ci_classes array.
	 * This function returns the object name if the class tested for is loaded,
	 * and returns FALSE if it isn't.
	 *
	 * It is mainly used in the form_helper -> _get_validation_object()
	 *
	 * @param 	string	class being checked for
	 * @return 	mixed	class object name on the CI SuperObject or FALSE
	 */
	public function is_loaded($class)
	{
		if (isset($this->_ci_classes[$class]))
		{
			return $this->_ci_classes[$class];
		}

		return FALSE;
	}

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

	/**
	 * Class Loader
	 *
	 * This function lets users load and instantiate classes.
	 * It is designed to be called from a user's app controllers.
	 *
	 * @param	string	the name of the class
	 * @param	mixed	the optional parameters
	 * @param	string	an optional object name
	 * @return	void
	 */
	public function library($library = '', $params = NULL, $object_name = NULL)
	{
		if (is_array($library))
		{
			foreach ($library as $class)
			{
				$this->library($class, $params);
			}

			return;
		}

		if ($library == '' OR isset($this->_base_classes[$library]))
		{
			return FALSE;
		}

		if ( ! is_null($params) && ! is_array($params))
		{
			$params = NULL;
		}

		$this->_ci_load_class($library, $params, $object_name);
	}

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

	/**
	 * Model Loader
	 *
	 * This function lets users load and instantiate models.
	 *
	 * @param	string	the name of the class
	 * @param	string	name for the model
	 * @param	bool	database connection
	 * @return	void
	 */
	public function model($model, $name = '', $db_conn = FALSE)
	{
		if (is_array($model))
		{
			foreach ($model as $babe)
			{
				$this->model($babe);
			}
			return;
		}

		if ($model == '')
		{
			return;
		}

		$path = '';

		// Is the model in a sub-folder? If so, parse out the filename and path.
		if (($last_slash = strrpos($model, '/')) !== FALSE)
		{
			// The path is in front of the last slash
			$path = substr($model, 0, $last_slash + 1);

			// And the model name behind it
			$model = substr($model, $last_slash + 1);
		}

		if ($name == '')
		{
			$name = $model;
		}

		if (in_array($name, $this->_ci_models, TRUE))
		{
			return;
		}

		$CI =& get_instance();
		if (isset($CI->$name))
		{
			show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
		}

		$model = strtolower($model);

		foreach ($this->_ci_model_paths as $mod_path)
		{
			if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))
			{
				continue;
			}

			if ($db_conn !== FALSE AND ! class_exists('CI_DB'))
			{
				if ($db_conn === TRUE)
				{
					$db_conn = '';
				}

				$CI->load->database($db_conn, FALSE, TRUE);
			}

			if ( ! class_exists('CI_Model'))
			{
				load_class('Model', 'core');
			}

			require_once($mod_path.'models/'.$path.$model.'.php');

			$model = ucfirst($model);

			$CI->$name = new $model();

			$this->_ci_models[] = $name;
			return;
		}

		// couldn't find the model
		show_error('Unable to locate the model you have specified: '.$model);
	}

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

	/**
	 * Database Loader
	 *
	 * @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
	 */
	public function database($params = '', $return = FALSE, $active_record = NULL)
	{
		// Grab the super object
		$CI =& get_instance();

		// Do we even need to load the database class?
		if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))
		{
			return FALSE;
		}

		require_once(BASEPATH.'database/DB.php');

		if ($return === TRUE)
		{
			return DB($params, $active_record);
		}

		// Initialize the db variable. Needed to prevent
		// reference errors with some configurations
		$CI->db = '';

		// Load the DB class
		$CI->db =& DB($params, $active_record);
	}

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

	/**
	 * Load the Utilities Class
	 *
	 * @return	string
	 */
	public function dbutil()
	{
		if ( ! class_exists('CI_DB'))
		{
			$this->database();
		}

		$CI =& get_instance();

		// for backwards compatibility, load dbforge so we can extend dbutils off it
		// this use is deprecated and strongly discouraged
		$CI->load->dbforge();

		require_once(BASEPATH.'database/DB_utility.php');
		require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');
		$class = 'CI_DB_'.$CI->db->dbdriver.'_utility';

		$CI->dbutil = new $class();
	}

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

	/**
	 * Load the Database Forge Class
	 *
	 * @return	string
	 */
	public function dbforge()
	{
		if ( ! class_exists('CI_DB'))
		{
			$this->database();
		}

		$CI =& get_instance();

		require_once(BASEPATH.'database/DB_forge.php');
		require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');
		$class = 'CI_DB_'.$CI->db->dbdriver.'_forge';

		$CI->dbforge = new $class();
	}

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

	/**
	 * 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 return data so that
	 * a developer can process it in some way.
	 *
	 * @param	string
	 * @param	array
	 * @param	bool
	 * @return	void
	 */
	public function view($view, $vars = array(), $return = FALSE)
	{
		return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));
	}

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

	/**
	 * Load File
	 *
	 * This is a generic file loader
	 *
	 * @param	string
	 * @param	bool
	 * @return	string
	 */
	public function file($path, $return = FALSE)
	{
		return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));
	}

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

	/**
	 * Set Variables
	 *
	 * Once variables are set they become available within
	 * the controller class and its "view" files.
	 *
	 * @param	array
	 * @return	void
	 */
	public function vars($vars = array(), $val = '')
	{
		if ($val != '' AND is_string($vars))
		{
			$vars = array($vars => $val);
		}

		$vars = $this->_ci_object_to_array($vars);

		if (is_array($vars) AND count($vars) > 0)
		{
			foreach ($vars as $key => $val)
			{
				$this->_ci_cached_vars[$key] = $val;
			}
		}
	}

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

	/**
	 * Load Helper
	 *
	 * This function loads the specified helper file.
	 *
	 * @param	mixed
	 * @return	void
	 */
	public function helper($helpers = array())
	{
		foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)
		{
			if (isset($this->_ci_helpers[$helper]))
			{
				continue;
			}

			$ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';

			// Is this a helper extension request?
			if (file_exists($ext_helper))
			{
				$base_helper = BASEPATH.'helpers/'.$helper.'.php';

				if ( ! file_exists($base_helper))
				{
					show_error('Unable to load the requested file: helpers/'.$helper.'.php');
				}

				include_once($ext_helper);
				include_once($base_helper);

				$this->_ci_helpers[$helper] = TRUE;
				log_message('debug', 'Helper loaded: '.$helper);
				continue;
			}

			// Try to load the helper
			foreach ($this->_ci_helper_paths as $path)
			{
				if (file_exists($path.'helpers/'.$helper.'.php'))
				{
					include_once($path.'helpers/'.$helper.'.php');

					$this->_ci_helpers[$helper] = TRUE;
					log_message('debug', 'Helper loaded: '.$helper);
					break;
				}
			}

			// unable to load the helper
			if ( ! isset($this->_ci_helpers[$helper]))
			{
				show_error('Unable to load the requested file: helpers/'.$helper.'.php');
			}
		}
	}

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

	/**
	 * Load Helpers
	 *
	 * This is simply an alias to the above function in case the
	 * user has written the plural form of this function.
	 *
	 * @param	array
	 * @return	void
	 */
	public function helpers($helpers = array())
	{
		$this->helper($helpers);
	}

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

	/**
	 * Loads a language file
	 *
	 * @param	array
	 * @param	string
	 * @return	void
	 */
	public function language($file = array(), $lang = '')
	{
		$CI =& get_instance();

		if ( ! is_array($file))
		{
			$file = array($file);
		}

		foreach ($file as $langfile)
		{
			$CI->lang->load($langfile, $lang);
		}
	}

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

	/**
	 * Loads a config file
	 *
	 * @param	string
	 * @return	void
	 */
	public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
	{
		$CI =& get_instance();
		$CI->config->load($file, $use_sections, $fail_gracefully);
	}

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

	/**
	 * Driver
	 *
	 * Loads a driver library
	 *
	 * @param	string	the name of the class
	 * @param	mixed	the optional parameters
	 * @param	string	an optional object name
	 * @return	void
	 */
	public function driver($library = '', $params = NULL, $object_name = NULL)
	{
		if ( ! class_exists('CI_Driver_Library'))
		{
			// we aren't instantiating an object here, that'll be done by the Library itself
			require BASEPATH.'libraries/Driver.php';
		}

		// We can save the loader some time since Drivers will *always* be in a subfolder,
		// and typically identically named to the library
		if ( ! strpos($library, '/'))
		{
			$library = ucfirst($library).'/'.$library;
		}

		return $this->library($library, $params, $object_name);
	}

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

	/**
	 * Add Package Path
	 *
	 * Prepends a parent path to the library, model, helper, and config path arrays
	 *
	 * @param	string
	 * @param 	boolean
	 * @return	void
	 */
	public function add_package_path($path, $view_cascade=TRUE)
	{
		$path = rtrim($path, '/').'/';

		array_unshift($this->_ci_library_paths, $path);
		array_unshift($this->_ci_model_paths, $path);
		array_unshift($this->_ci_helper_paths, $path);

		$this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;

		// Add config file path
		$config =& $this->_ci_get_component('config');
		array_unshift($config->_config_paths, $path);
	}

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

	/**
	 * Get Package Paths
	 *
	 * Return a list of all package paths, by default it will ignore BASEPATH.
	 *
	 * @param	string
	 * @return	void
	 */
	public function get_package_paths($include_base = FALSE)
	{
		return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths;
	}

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

	/**
	 * Remove Package Path
	 *
	 * Remove a path from the library, model, and helper path arrays if it exists
	 * If no path is provided, the most recently added path is removed.
	 *
	 * @param	type
	 * @return	type
	 */
	public function remove_package_path($path = '', $remove_config_path = TRUE)
	{
		$config =& $this->_ci_get_component('config');

		if ($path == '')
		{
			$void = array_shift($this->_ci_library_paths);
			$void = array_shift($this->_ci_model_paths);
			$void = array_shift($this->_ci_helper_paths);
			$void = array_shift($this->_ci_view_paths);
			$void = array_shift($config->_config_paths);
		}
		else
		{
			$path = rtrim($path, '/').'/';
			foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var)
			{
				if (($key = array_search($path, $this->{$var})) !== FALSE)
				{
					unset($this->{$var}[$key]);
				}
			}

			if (isset($this->_ci_view_paths[$path.'views/']))
			{
				unset($this->_ci_view_paths[$path.'views/']);
			}

			if (($key = array_search($path, $config->_config_paths)) !== FALSE)
			{
				unset($config->_config_paths[$key]);
			}
		}

		// make sure the application default paths are still in the array
		$this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH, BASEPATH)));
		$this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH, BASEPATH)));
		$this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH)));
		$this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE));
		$config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH)));
	}

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

	/**
	 * Loader
	 *
	 * This function is used to load views and files.
	 * Variables are prefixed with _ci_ to avoid symbol collision with
	 * variables made available to view files
	 *
	 * @param	array
	 * @return	void
	 */
	protected function _ci_load($_ci_data)
	{
		// Set the default data variables
		foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)
		{
			$$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];
		}

		$file_exists = FALSE;

		// Set the path to the requested file
		if ($_ci_path != '')
		{
			$_ci_x = explode('/', $_ci_path);
			$_ci_file = end($_ci_x);
		}
		else
		{
			$_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
			$_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;

			foreach ($this->_ci_view_paths as $view_file => $cascade)
			{
				if (file_exists($view_file.$_ci_file))
				{
					$_ci_path = $view_file.$_ci_file;
					$file_exists = TRUE;
					break;
				}

				if ( ! $cascade)
				{
					break;
				}
			}
		}

		if ( ! $file_exists && ! file_exists($_ci_path))
		{
			show_error('Unable to load the requested file: '.$_ci_file);
		}

		// This allows anything loaded using $this->load (views, files, etc.)
		// to become accessible from within the Controller and Model functions.

		$_ci_CI =& get_instance();
		foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var)
		{
			if ( ! isset($this->$_ci_key))
			{
				$this->$_ci_key =& $_ci_CI->$_ci_key;
			}
		}

		/*
		 * Extract and cache variables
		 *
		 * You can either set variables using the dedicated $this->load_vars()
		 * function or via the second parameter of this function. We'll merge
		 * the two types and cache them so that views that are embedded within
		 * other views can have access to these variables.
		 */
		if (is_array($_ci_vars))
		{
			$this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);
		}
		extract($this->_ci_cached_vars);

		/*
		 * 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 accurate.
		 */
		ob_start();

		// If the PHP installation does not support short tags we'll
		// do a little string replacement, changing the short tags
		// to standard PHP echo statements.

		if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE)
		{
			echo eval('?>'.preg_replace("/;*\s*\?>/", "; ?>", str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));
		}
		else
		{
			include($_ci_path); // include() vs include_once() allows for multiple views with the same name
		}

		log_message('debug', 'File loaded: '.$_ci_path);

		// Return the file data if requested
		if ($_ci_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->_ci_ob_level + 1)
		{
			ob_end_flush();
		}
		else
		{
			$_ci_CI->output->append_output(ob_get_contents());
			@ob_end_clean();
		}
	}

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

	/**
	 * Load class
	 *
	 * This function loads the requested class.
	 *
	 * @param	string	the item that is being loaded
	 * @param	mixed	any additional parameters
	 * @param	string	an optional object name
	 * @return	void
	 */
	protected function _ci_load_class($class, $params = NULL, $object_name = NULL)
	{
		// Get the class name, and while we're at it trim any slashes.
		// The directory path can be included as part of the class name,
		// but we don't want a leading slash
		$class = str_replace('.php', '', trim($class, '/'));

		// Was the path included with the class name?
		// We look for a slash to determine this
		$subdir = '';
		if (($last_slash = strrpos($class, '/')) !== FALSE)
		{
			// Extract the path
			$subdir = substr($class, 0, $last_slash + 1);

			// Get the filename from the path
			$class = substr($class, $last_slash + 1);
		}

		// We'll test for both lowercase and capitalized versions of the file name
		foreach (array(ucfirst($class), strtolower($class)) as $class)
		{
			$subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';

			// Is this a class extension request?
			if (file_exists($subclass))
			{
				$baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';

				if ( ! file_exists($baseclass))
				{
					log_message('error', "Unable to load the requested class: ".$class);
					show_error("Unable to load the requested class: ".$class);
				}

				// Safety: Was the class already loaded by a previous call?
				if (in_array($subclass, $this->_ci_loaded_files))
				{
					// Before we deem this to be a duplicate request, let's see
					// if a custom object name is being supplied. If so, we'll
					// return a new instance of the object
					if ( ! is_null($object_name))
					{
						$CI =& get_instance();
						if ( ! isset($CI->$object_name))
						{
							return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
						}
					}

					$is_duplicate = TRUE;
					log_message('debug', $class." class already loaded. Second attempt ignored.");
					return;
				}

				include_once($baseclass);
				include_once($subclass);
				$this->_ci_loaded_files[] = $subclass;

				return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
			}

			// Lets search for the requested library file and load it.
			$is_duplicate = FALSE;
			foreach ($this->_ci_library_paths as $path)
			{
				$filepath = $path.'libraries/'.$subdir.$class.'.php';

				// Does the file exist? No? Bummer...
				if ( ! file_exists($filepath))
				{
					continue;
				}

				// Safety: Was the class already loaded by a previous call?
				if (in_array($filepath, $this->_ci_loaded_files))
				{
					// Before we deem this to be a duplicate request, let's see
					// if a custom object name is being supplied. If so, we'll
					// return a new instance of the object
					if ( ! is_null($object_name))
					{
						$CI =& get_instance();
						if ( ! isset($CI->$object_name))
						{
							return $this->_ci_init_class($class, '', $params, $object_name);
						}
					}

					$is_duplicate = TRUE;
					log_message('debug', $class." class already loaded. Second attempt ignored.");
					return;
				}

				include_once($filepath);
				$this->_ci_loaded_files[] = $filepath;
				return $this->_ci_init_class($class, '', $params, $object_name);
			}

		} // END FOREACH

		// One last attempt. Maybe the library is in a subdirectory, but it wasn't specified?
		if ($subdir == '')
		{
			$path = strtolower($class).'/'.$class;
			return $this->_ci_load_class($path, $params);
		}

		// If we got this far we were unable to find the requested class.
		// We do not issue errors if the load call failed due to a duplicate request
		if ($is_duplicate == FALSE)
		{
			log_message('error', "Unable to load the requested class: ".$class);
			show_error("Unable to load the requested class: ".$class);
		}
	}

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

	/**
	 * Instantiates a class
	 *
	 * @param	string
	 * @param	string
	 * @param	string	an optional object name
	 * @return	null
	 */
	protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)
	{
		// Is there an associated config file for this class? Note: these should always be lowercase
		if ($config === NULL)
		{
			// Fetch the config paths containing any package paths
			$config_component = $this->_ci_get_component('config');

			if (is_array($config_component->_config_paths))
			{
				// Break on the first found file, thus package files
				// are not overridden by default paths
				foreach ($config_component->_config_paths as $path)
				{
					// We test for both uppercase and lowercase, for servers that
					// are case-sensitive with regard to file names. Check for environment
					// first, global next
					if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))
					{
						include_once($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');
						break;
					}
					elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'))
					{
						include_once($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');
						break;
					}
					elseif (file_exists($path .'config/'.strtolower($class).'.php'))
					{
						include_once($path .'config/'.strtolower($class).'.php');
						break;
					}
					elseif (file_exists($path .'config/'.ucfirst(strtolower($class)).'.php'))
					{
						include_once($path .'config/'.ucfirst(strtolower($class)).'.php');
						break;
					}
				}
			}
		}

		if ($prefix == '')
		{
			if (class_exists('CI_'.$class))
			{
				$name = 'CI_'.$class;
			}
			elseif (class_exists(config_item('subclass_prefix').$class))
			{
				$name = config_item('subclass_prefix').$class;
			}
			else
			{
				$name = $class;
			}
		}
		else
		{
			$name = $prefix.$class;
		}

		// Is the class name valid?
		if ( ! class_exists($name))
		{
			log_message('error', "Non-existent class: ".$name);
			show_error("Non-existent class: ".$class);
		}

		// Set the variable name we will assign the class to
		// Was a custom class name supplied? If so we'll use it
		$class = strtolower($class);

		if (is_null($object_name))
		{
			$classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];
		}
		else
		{
			$classvar = $object_name;
		}

		// Save the class name and object name
		$this->_ci_classes[$class] = $classvar;

		// Instantiate the class
		$CI =& get_instance();
		if ($config !== NULL)
		{
			$CI->$classvar = new $name($config);
		}
		else
		{
			$CI->$classvar = new $name;
		}
	}

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

	/**
	 * Autoloader
	 *
	 * The config/autoload.php file contains an array that permits sub-systems,
	 * libraries, and helpers to be loaded automatically.
	 *
	 * This function is public, as it's used in the CI_Controller class.
	 * However, there is no reason you should ever needs to use it.
	 *
	 * @param	array
	 * @return	void
	 */
	public function ci_autoloader()
	{
		if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))
		{
			include_once(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
		}
		else
		{
			include_once(APPPATH.'config/autoload.php');
		}


		if ( ! isset($autoload))
		{
			return FALSE;
		}

		// Autoload packages
		if (isset($autoload['packages']))
		{
			foreach ($autoload['packages'] as $package_path)
			{
				$this->add_package_path($package_path);
			}
		}

		// Load any custom config file
		if (count($autoload['config']) > 0)
		{
			$CI =& get_instance();
			foreach ($autoload['config'] as $key => $val)
			{
				$CI->config->load($val);
			}
		}

		// Autoload helpers and languages
		foreach (array('helper', 'language') as $type)
		{
			if (isset($autoload[$type]) AND count($autoload[$type]) > 0)
			{
				$this->$type($autoload[$type]);
			}
		}

		// A little tweak to remain backward compatible
		// The $autoload['core'] item was deprecated
		if ( ! isset($autoload['libraries']) AND isset($autoload['core']))
		{
			$autoload['libraries'] = $autoload['core'];
		}

		// Load libraries
		if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)
		{
			// Load the database driver.
			if (in_array('database', $autoload['libraries']))
			{
				$this->database();
				$autoload['libraries'] = array_diff($autoload['libraries'], array('database'));
			}

			// Load all other libraries
			foreach ($autoload['libraries'] as $item)
			{
				$this->library($item);
			}
		}

		// Autoload models
		if (isset($autoload['model']))
		{
			$this->model($autoload['model']);
		}
	}

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

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

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

	/**
	 * Get a reference to a specific library or model
	 *
	 * @return	bool
	 */
	protected function &_ci_get_component($component)
	{
		$CI =& get_instance();
		return $CI->$component;
	}

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

	/**
	 * Prep filename
	 *
	 * This function preps the name of various items to make loading them more reliable.
	 *
	 * @param	mixed
	 * @return	array
	 */
	protected function _ci_prep_filename($filename, $extension)
	{
		if ( ! is_array($filename))
		{
			return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));
		}
		else
		{
			foreach ($filename as $key => $val)
			{
				$filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);
			}

			return $filename;
		}
	}
}

/* End of file Loader.php */
/* Location: ./system/core/Loader.php */