Loader.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # Blue Static ISSO Framework [#]issoversion[#]
   5 || # Copyright ©2002-[#]year[#] Blue Static
   6 || #
   7 || # This program is free software; you can redistribute it and/or modify
   8 || # it under the terms of the GNU General Public License as published by
   9 || # the Free Software Foundation; version [#]gpl[#] of the License.
  10 || #
  11 || # This program is distributed in the hope that it will be useful, but
  12 || # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13 || # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  14 || # more details.
  15 || #
  16 || # You should have received a copy of the GNU General Public License along
  17 || # with this program; if not, write to the Free Software Foundation, Inc.,
  18 || # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  19 || ###################################################################
  20 \*=====================================================================*/
  21
  22 /**
  23 * System loader (Loader.php)
  24 *
  25 * @package      ISSO
  26 */
  27
  28 /**
  29 * System Loader
  30 *
  31 * This class contains static methods that are used to create new registers and
  32 * load modules.
  33 *
  34 * @author               Blue Static
  35 * @copyright    Copyright ©2002 - [#]year[#], Blue Static
  36 * @version              $Revision$
  37 * @package              ISSO
  38 *
  39 */
  40 class BSLoader
  41 {
  42         /**
  43         * Singleton instance
  44         * @var  object
  45         */
  46         private static $instance;
  47
  48         /**
  49         * Array of all the registers
  50         * @var  array
  51         */
  52         private $registers = array();
  53
  54         /**
  55         * The main register
  56         * @var  object
  57         */
  58         private $main;
  59
  60         // ###################################################################
  61         /**
  62         * Constructor
  63         */
  64         private function __construct() {}
  65
  66         // ###################################################################
  67         /**
  68         * Returns the shared instance of the BSLoader singleton class.
  69         *
  70         * @return       object  The BSLoader shared instance
  71         */
  72         private function SharedInstance()
  73         {
  74                 if (!self::$instance)
  75                 {
  76                         self::$instance = new BSLoader;
  77                         set_error_handler(array(self::$instance, '_error_handler'));
  78                 }
  79                 return self::$instance;
  80         }
  81
  82         // ###################################################################
  83         /**
  84         * Creates a new BSRegister instance and returns it.
  85         *
  86         * @return       object  New register
  87         */
  88         public static function NewRegister()
  89         {
  90                 require_once('ISSO/Register.php');
  91
  92                 self::SharedInstance()->registers[] = new BSRegister();
  93
  94                 return end(self::SharedInstance()->registers);
  95         }
  96
  97         // ###################################################################
  98         /**
  99         * Returns the array of all the registers
 100         *
 101         * @return       array   The array of all the registers
 102         */
 103         public static function GetAllRegisters()
 104         {
 105                 return self::SharedInstance()->registers;
 106         }
 107
 108         // ###################################################################
 109         /**
 110         * Sets the main register
 111         *
 112         * @param        object  New main register
 113         */
 114         public static function SetRegister($register)
 115         {
 116                 if (get_class($register) != 'BSRegister')
 117                 {
 118                         trigger_error('BSLoader::SetRegister() was not passed a BSRegister object');
 119                         return;
 120                 }
 121
 122                 self::SharedInstance()->main = $register;
 123         }
 124
 125         // ###################################################################
 126         /**
 127         * Gets the main register if no argument is passed, or an arbitrary
 128         * one if the index of a register is passed.
 129         *
 130         * @param        integer Register index
 131         *
 132         * @return       object  Specified register
 133         */
 134         public static function &GetRegister($index = null)
 135         {
 136                 if (is_null($index))
 137                 {
 138                         if (!isset(self::SharedInstance()->main))
 139                         {
 140                                 trigger_error('Cannot fetch the main register because it has not been set with BSLoader::SetRegister()');
 141                                 return;
 142                         }
 143                         return self::SharedInstance()->main;
 144                 }
 145                 else
 146                 {
 147                         if (!isset(self::SharedInstance()->registers["$index"]))
 148                         {
 149                                 trigger_error('Invalid register index passed to BSLoader::GetRegister()');
 150                                 return;
 151                         }
 152                         return self::SharedInstance()->registers["$index"];
 153                 }
 154         }
 155
 156         // ###################################################################
 157         /**
 158         * Determines if there's a main register set. If not, returns FALSE.
 159         *
 160         * @return       bool    Is there a main register set?
 161         */
 162         public static function HasRegister()
 163         {
 164                 return (isset(self::SharedInstance()->main) AND self::SharedInstance()->main instanceof BSRegister);
 165         }
 166
 167         // ###################################################################
 168         /**
 169         * Loads the specified module.
 170         *
 171         * @param        string  Module name
 172         *
 173         * @return       object  Instantiated module
 174         */
 175         public static function LoadModule($name)
 176         {
 177                 @include_once("ISSO/$name.php");
 178
 179                 $class = "BS$name";
 180
 181                 if (!class_exists($class))
 182                 {
 183                         trigger_error('Specifed module does not conform to the ISSO specification, or the class is missing');
 184                         return;
 185                 }
 186
 187                 return new $class;
 188         }
 189
 190         // ###################################################################
 191         /**
 192         * Prints an ISSO message
 193         *
 194         * @param        string  The title of the message
 195         * @param        string  The content of the message
 196         * @param        integer Type of message to be printed
 197         * @param        bool    Return the output?
 198         * @param        bool    Show the debug stack?
 199         * @param        integer Message width
 200         *
 201         * @return       mixed   Output or null
 202         */
 203         public static function Message($title, $message, $type, $return = false, $stack = true, $width = 500)
 204         {
 205                 switch ($type)
 206                 {
 207                         // Message
 208                         case 1:
 209                                 $prefix = 'Message';
 210                                 $color = '#669900';
 211                                 $font = '#000000';
 212                         break;
 213
 214                         // Warning
 215                         case 2:
 216                                 $prefix = 'Warning';
 217                                 $color = '#003399';
 218                                 $font = '#FFFFFF';
 219                         break;
 220
 221                         case 3:
 222                                 $prefix = 'Error';
 223                                 $color = '#990000';
 224                                 $font = '#EFEFEF';
 225                         break;
 226                 }
 227
 228                 echo "\n<br />\n<table cellpadding=\"4\" cellspacing=\"1\" border=\"0\" width=\"$width\" style=\"background-color: $color; color: black; font-family: Verdana, sans-serif; font-size: 12px;\">";
 229                 echo "\n<tr style=\"color: $font; text-align: left\">\n\t<td><strong>$prefix: $title</strong></td>\n</tr>";
 230                 echo "\n<tr style=\"background-color: #FFFFFF; text-align: left\">\n\t<td>$message</td>\n</tr>";
 231                 if ($stack AND self::HasRegister() AND self::GetRegister()->getDebug())
 232                 {
 233                         echo "\n<tr style=\"background-color: #FFFFFF; text-align: left\">\n\t<td><strong>Debug Stack:</strong> <pre>";
 234                         debug_print_backtrace();
 235                         echo "</pre></td>\n</tr>";
 236                 }
 237                 echo "\n</table>\n<br />\n";
 238         }
 239
 240         // ###################################################################
 241         /**
 242         * Custom error handler for ISSO; only handle E_WARNING, E_NOTICE,
 243         * E_USER_ERROR, E_USER_WARNING, E_USER_NOTICE
 244         *
 245         * @param        integer Error number
 246         * @param        string  Error message string
 247         * @param        string  File that contains the error
 248         * @param        string  The line number of the error
 249         * @param        string  The active symbol table at which point the error occurred
 250         */
 251         private function _error_handler($errno, $errstr, $errfile, $errline, $errcontext)
 252         {
 253                 $level = ini_get('error_reporting');
 254
 255                 switch ($errno)
 256                 {
 257                         // So we don't need to specify the error type in trigger_error(), all E_USER_NOTICEs
 258                         // are fatal and automatically kill the script
 259                         case E_USER_NOTICE:
 260                                 $title = 'Fatal';
 261                                 $mode = 3;
 262                         break;
 263
 264                         // A non-fatal but important warning
 265                         case E_WARNING:
 266                                 $title = 'Warning';
 267                                 $mode = 2;
 268                                 if (!($level & E_WARNING))
 269                                 {
 270                                         return;
 271                                 }
 272                         break;
 273
 274                         // A non-fatal notice that should all but be ignored unless in dev environments
 275                         case E_NOTICE:
 276                         case E_STRICT:
 277                                 $title = 'Notice';
 278                                 $mode = 1;
 279                                 if (!($level & E_NOTICE))
 280                                 {
 281                                         return;
 282                                 }
 283                         break;
 284
 285                         case E_USER_WARNING:
 286                         case E_USER_NOTICE:
 287                         default:
 288                                 trigger_error('The only error types supported are E_USER_NOTICE (fatal), E_WARNING, and E_NOTICE ' . $errno);
 289                         break;
 290                 }
 291
 292                 $errstr .= " in <strong>$errfile</strong> on line <strong>$errline</strong>";
 293
 294                 $errstr = str_replace(array(getcwd(), dirname(getcwd())), '', $errstr);
 295
 296                 self::Message($title, $errstr, $mode);
 297
 298                 if ($errno == E_USER_NOTICE)
 299                 {
 300                         exit;
 301                 }
 302         }
 303
 304         // ###################################################################
 305         /**
 306         * Creates a table that explains the error reporting levels and their
 307         * state
 308         */
 309         public function explain_error_reporting()
 310         {
 311                 $levels = array(
 312                         'E_ERROR'                       => E_ERROR,
 313                         'E_WARNING'                     => E_WARNING,
 314                         'E_PARSE'                       => E_PARSE,
 315                         'E_NOTICE'                      => E_NOTICE,
 316                         'E_CORE_ERROR'          => E_CORE_ERROR,
 317                         'E_CORE_WARNING'        => E_CORE_WARNING,
 318                         'E_COMPILE_ERROR'       => E_COMPILE_ERROR,
 319                         'E_COMPILE_WARNING'     => E_COMPILE_WARNING,
 320                         'E_USER_ERROR'          => E_USER_ERROR,
 321                         'E_USER_WARNING'        => E_USER_WARNING,
 322                         'E_USER_NOTICE'         => E_USER_NOTICE,
 323                         'E_ALL'                         => E_ALL,
 324                         'E_STRICT'                      => E_STRICT
 325                 );
 326
 327                 $table = '<table cellspacing="0" cellpadding="2" border="0">';
 328
 329                 foreach ($levels AS $name => $value)
 330                 {
 331                         $table .= '
 332                         <tr>
 333                                 <td>' . $name . '</td>
 334                                 <td>' . (ini_get('error_reporting') & $value) . '</td>
 335                         </tr>';
 336                 }
 337
 338                 $table .= '
 339                 </table>';
 340
 341                 $this->message('Error Reporting', $table, 1);
 342         }
 343 }
 344
 345 /*=====================================================================*\
 346 || ###################################################################
 347 || # $HeadURL$
 348 || # $Id$
 349 || ###################################################################
 350 \*=====================================================================*/
 351 ?>