Template.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # Blue Static ISSO Framework
   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 * Database-Driven Template System (template.php)
  24 *
  25 * @package      ISSO
  26 */
  27
  28 require_once('ISSO/Functions.php');
  29
  30 /**
  31 * File-Based Template System
  32 *
  33 * This framework merely replaces the template loading functions with
  34 * file-system based ones. It has an optional caching system in which
  35 * template data will remain stored in the database as long as the filesystem
  36 * file is modified. To do this, pass a table name to setDatabaseCache() and make sure
  37 * there's a DB module that has access to a table with this schema:
  38 *
  39 * CREATE TABLE template (filename VARCHAR (250) NOT NULL, template TEXT NOT NULL, timestamp INT NOT NULL);
  40 *
  41 * @author               Blue Static
  42 * @copyright    Copyright ©2002 - [#]year[#], Blue Static
  43 * @version              $Revision$
  44 * @package              ISSO
  45 *
  46 */
  47 class BSTemplate
  48 {
  49         /**
  50         * The path, from the path of the application, where templates are stored
  51         * @var  string
  52         */
  53         private $templateDir = '';
  54
  55         /**
  56         * The extension all the template files have
  57         * @var  string
  58         */
  59         private $extension = 'tpl';
  60
  61         /**
  62         * The database table name for the template cache
  63         * @var string
  64         */
  65         private $dbCacheTable = null;
  66
  67         /**
  68         * The name of the function phrases are fetched with
  69         * @var  string
  70         */
  71         private $langcall = 'gettext';
  72
  73         /**
  74         * The name of the function phrases are sprintf() parsed with
  75         * @var  string
  76         */
  77         private $langconst = 'sprintf';
  78
  79         /**
  80         * Array of pre-compiled templates that are stored to decrease server load
  81         * @var  array
  82         */
  83         protected $cache = array();
  84
  85         /**
  86         * A list of the number of times each template has been used
  87         * @var  array
  88         */
  89         protected $usage = array();
  90
  91         /**
  92         * A list of templates that weren't cached, but are still used
  93         * @var  array
  94         */
  95         protected $uncached = array();
  96
  97         /**
  98         * Whether or not the page has been flush()'d already
  99         * @var  bool
 100         */
 101         private $doneflush = false;
 102
 103         /**
 104         * The name of a function that is called before template parsing of phrases and conditionals occurs
 105         * @var  string
 106         */
 107         private $preParseHook = ':undefined:';
 108
 109         // ###################################################################
 110         /**
 111         * Sets the template directory name
 112         *
 113         * @param        string  Template directory name
 114         */
 115         public function setTemplateDirectory($dir)
 116         {
 117                 $this->templateDir = BSFunctions::FetchSourcePath($dir);
 118         }
 119
 120         // ###################################################################
 121         /**
 122         * Sets the file extension for the templates
 123         *
 124         * @param        string  File extension
 125         */
 126         public function setExtension($ext)
 127         {
 128                 $this->extension = $ext;
 129         }
 130
 131         // ###################################################################
 132         /**
 133         * Sets the name of the table to access for the datbase cache
 134         *
 135         * @param        string  DB table name
 136         */
 137         public function setDatabaseCache($table)
 138         {
 139                 $this->dbCacheTable = $table;
 140         }
 141
 142         // ###################################################################
 143         /**
 144         * Sets the pre-parse hook method which is called before any other
 145         * processing is done on the template.
 146         *
 147         * @param        string  Method name
 148         */
 149         public function setPreParseHook($hook)
 150         {
 151                 $this->preParseHook = $hook;
 152         }
 153
 154         // ###################################################################
 155         /**
 156         * Takes an array of template names, loads them, and then stores a
 157         * parsed version for optimum speed.
 158         *
 159         * @param        array   List of template names to be cached
 160         */
 161         public function cache($namearray)
 162         {
 163                 if (sizeof($this->cache) > 0)
 164                 {
 165                         throw new Exception('You cannot cache templates more than once per initialization');
 166                 }
 167                 else
 168                 {
 169                         $dbCache = array();
 170                         if ($this->dbCacheTable)
 171                         {
 172                                 $db =& BSApp::GetType('Db');
 173                                 $cache = $db->query("SELECT * FROM {$this->dbCacheTable} WHERE filename IN ('" . implode("', '", $namearray) . "')");
 174                                 while ($tpl = $db->fetchArray($cache))
 175                                 {
 176                                         $time = filemtime($this->templateDir . $tpl['filename'] . '.' . $this->extension);
 177                                         $template = $tpl['template'];
 178                                         if ($time > $tpl['timestamp'])
 179                                         {
 180                                                 $template = $this->_parseTemplate($this->_loadTemplate($tpl['filename']));
 181                                                 $db->query("UPDATE {$this->dbCacheTable} SET template = '" . $db->escapeString($template) . "', timestamp = " . TIMENOW . " WHERE filename = '" . $tpl['filename'] . "'");
 182                                                 $tpl['template'] = $template;
 183                                         }
 184                                         $dbCache["$tpl[filename]"] = $template;
 185                                 }
 186                         }
 187                         foreach ($namearray AS $name)
 188                         {
 189                                 if ($this->dbCacheTable)
 190                                 {
 191                                         if (isset($dbCache["$name"]))
 192                                         {
 193                                                 $template = $dbCache["$name"];
 194                                         }
 195                                         else
 196                                         {
 197                                                 $template = $this->_parseTemplate($this->_loadTemplate($name));
 198                                                 $db->query("INSERT INTO {$this->dbCacheTable} (filename, template, timestamp) VALUES ('$name', '" . $db->escapeString($template) . "', " . TIMENOW . ")");
 199                                         }
 200                                 }
 201                                 else
 202                                 {
 203                                         $template = $this->_parseTemplate($this->_loadTemplate($name));
 204                                 }
 205
 206                                 $this->cache["$name"] = $template;
 207                                 $this->usage["$name"] = 0;
 208                         }
 209                 }
 210         }
 211
 212         // ###################################################################
 213         /**
 214         * Loads a template from the cache or the _load function and stores the
 215         * parsed version of it
 216         *
 217         * @param        string  The name of the template
 218         *
 219         * @return       string  A parsed and loaded template
 220         */
 221         public function fetch($name)
 222         {
 223                 if (isset($this->cache["$name"]))
 224                 {
 225                         $template = $this->cache["$name"];
 226                 }
 227                 else
 228                 {
 229                         $this->uncached[] = $name;
 230                         BSApp::Debug("Manually loading template '$name'");
 231                         $template = $this->_loadTemplate($name);
 232                         $template = $this->_parseTemplate($template);
 233                 }
 234
 235                 if (!isset($this->usage["$name"]))
 236                 {
 237                         $this->usage["$name"] = 0;
 238                 }
 239
 240                 $this->usage["$name"]++;
 241
 242                 return $template;
 243         }
 244
 245         // ###################################################################
 246         /**
 247         * Output a template fully compiled to the browser
 248         *
 249         * @param        string  Compiled and ready template
 250         */
 251         public function flush($template)
 252         {
 253                 ob_start();
 254
 255                 if (empty($template))
 256                 {
 257                         throw new Exception('There was no output to print');
 258                 }
 259
 260                 if ($this->doneflush)
 261                 {
 262                         throw new Exception('A template has already been sent to the output buffer');
 263                 }
 264
 265                 $debugBlock = '';
 266                 if (BSApp::GetDebug())
 267                 {
 268                         if (defined('SVN') AND preg_match('#^\$Id:?#', constant('SVN')))
 269                         {
 270                                 $debugBlock .= preg_replace('#\$' . 'Id: (.+?) ([0-9].+?) [0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}(.+?) (.+?) \$#', "\n<br />\n" . '<div align="center"><strong>\1</strong> &mdash; r\2</div>', constant('SVN'));
 271                         }
 272
 273                         if (defined('ISSO_MT_START'))
 274                         {
 275                                 $debugBlock .= "\n<div align=\"center\">Executed in " . round(BSFunctions::FetchMicrotimeDiff(ISSO_MT_START), 10) . ' seconds</div>';
 276                         }
 277
 278                         $debugBlock .= "\n<br /><div align=\"center\">" . BSApp::GetDebugList() . "</div>";
 279
 280                         $optlist = array();
 281                         $usage = array();
 282                         foreach ($this->usage AS $name => $count)
 283                         {
 284                                 if (in_array($name, $this->uncached))
 285                                 {
 286                                         $optlist[] = $name . '[' . $count . ']';
 287                                 }
 288                                 $usage[] = $name . " ($count)";
 289                         }
 290                         $sizeof = sizeof($this->uncached);
 291                         if ($sizeof > 0)
 292                         {
 293                                 $debugBlock .= "<br /><div style=\"color: red\" align=\"center\"><strong>Uncached Template(s):</strong> $sizeof ( " . implode(' &nbsp; ', $optlist) . " )</div>\n";
 294                         }
 295
 296                         $debugBlock .= (sizeof($this->uncached) < 1 ? "<br />\n" : '') . "<div align=\"center\"><select><option>Template Usage (" . array_sum($this->usage) . ")</option>";
 297                         foreach ($usage AS $tpl)
 298                         {
 299                                 $debugBlock .= "<option>--- $tpl</option>";
 300                         }
 301                         $debugBlock .= "</select></div>\n";
 302
 303                         if (BSApp::GetType('Db'))
 304                         {
 305                                 $queries = BSApp::GetType('Db')->getHistory();
 306
 307                                 $debugBlock .= "<br />\n" . '<table cellpadding="4" cellspacing="1" border="0" align="center" width="30%" style="background-color: rgb(60, 60, 60); color: white">' . "\n\t" . '<tr><td><strong>Query Debug</strong></td></tr>';
 308
 309                                 foreach ($queries AS $query)
 310                                 {
 311                                         $debugBlock .= "\n\t<tr style=\"background-color: rgb(230, 230, 230); color: black\">";
 312                                         $debugBlock .= "\n\t\t<td>";
 313                                         $debugBlock .= "\n\t\t\t$query[query]\n\n\t\t\t<div style=\"font-size: 9px;\">($query[time])</div>\n<!--\n$query[trace]\n-->\n\t\t</td>\n\t</tr>";
 314                                 }
 315
 316                                 $debugBlock .= "\n</table>\n\n\n";
 317                         }
 318                 }
 319
 320                 $template = str_replace('</body>', $debugBlock . '</body>', $template);
 321
 322                 print($template);
 323         }
 324
 325         // ###################################################################
 326         /**
 327         * Loads an additional template from the database
 328         *
 329         * @param        string  The name of the template
 330         *
 331         * @return       string  Template data from the database
 332         */
 333         protected function _loadTemplate($name)
 334         {
 335                 $path = $this->templateDir . $name . '.' . $this->extension;
 336                 if (is_file($path) AND is_readable($path))
 337                 {
 338                         return @file_get_contents($path);
 339                 }
 340                 else
 341                 {
 342                         throw new Exception("Could not load the template '$path'");
 343                 }
 344         }
 345
 346         // ###################################################################
 347         /**
 348         * A wrapper for all the parsing functions and compiling functins
 349         *
 350         * @param        string  Unparsed template data
 351         *
 352         * @return       string  Parsed template data
 353         */
 354         protected function _parseTemplate($template)
 355         {
 356                 $template = str_replace('"', '\"', $template);
 357
 358                 if (function_exists($this->preParseHook))
 359                 {
 360                         $template = call_user_func($this->preParseHook, $template);
 361                 }
 362
 363                 $template = $this->_parseBlocksAndTokens($template);
 364                 $template = $this->_parsePhrases($template);
 365                 $template = $this->_parseConditionals($template);
 366                 return $template;
 367         }
 368
 369         // ###################################################################
 370         /**
 371         * Parses anything with curly braces {} (including phrases)
 372         *
 373         * @param        string  Template data
 374         *
 375         * @return       string  Parsed template data
 376         */
 377         private function _parseBlocksAndTokens($template)
 378         {
 379                 $stack = array();
 380                 $tokens = array();
 381
 382                 while (1)
 383                 {
 384                         for ($i = 0; $i < strlen($template); $i++)
 385                         {
 386                                 // we've run through the template and there's nothing in the stack--done
 387                                 if ($i == strlen($template) - 1 AND sizeof($stack) == 0)
 388                                 {
 389                                         return $template;
 390                                 }
 391
 392                                 if ($template[$i] == '{')
 393                                 {
 394                                         // ignore escaped sequences
 395                                         if ($template[$i - 1] != '\\')
 396                                         {
 397                                                 array_push($stack, $i);
 398                                         }
 399                                 }
 400                                 else if ($template[$i] == '}')
 401                                 {
 402                                         // there's no stack so it was probably escaped
 403                                         if (sizeof($stack) == 0)
 404                                         {
 405                                                 continue;
 406                                         }
 407                                         // we're good and nested
 408                                         else if (sizeof($stack) == 1)
 409                                         {
 410                                                 $open = array_pop($stack);
 411                                                 $token = substr($template, $open, $i - $open + 1);
 412                                                 $template = str_replace($token, $this->_parseToken($token), $template);
 413                                                 break;
 414                                         }
 415                                         // just pop it off
 416                                         else
 417                                         {
 418                                                 array_pop($stack);
 419                                         }
 420                                 }
 421                         }
 422                 }
 423         }
 424
 425         // ###################################################################
 426         /**
 427         * Parses a curly brace token {}
 428         *
 429         * @param        string  Token
 430         *
 431         * @return       string  Parsed value
 432         */
 433         private function _parseToken($token)
 434         {
 435                 // knock of the braces
 436                 $token = substr($token, 1, strlen($token) - 2);
 437
 438                 // language token
 439                 if ($token[0] == '@' AND $token[1] == '\\' AND $token[2] == '"')
 440                 {
 441                         return '" . ' . $this->langcall . '(\'' . str_replace(array('\\\"', "'"), array('"', "\'"), substr($token, 3, strlen($token) - 5)) . '\')' . ' . "';
 442                 }
 443                 // normal PHP code
 444                 else
 445                 {
 446                         return '" . (' . $token . ') . "';
 447                 }
 448         }
 449
 450         // ###################################################################
 451         /**
 452         * Prepares language and locale information inside templates
 453         *
 454         * @param        string  Template data to be processed
 455         *
 456         * @return       string  Language-ready template data
 457         */
 458         private function _parsePhrases($template)
 459         {
 460                 $tagStart = '<lang ';
 461                 $tagEnd = '</lang>';
 462
 463                 $start = -1; // start of open tag
 464                 $end = -1; // start of the close tag
 465                 $varEnd = -1; // end of the open tag
 466
 467                 while ($start <= strlen($template))
 468                 {
 469                         // reset
 470                         $varMap = array(); // storage for all the substitution indices
 471
 472                         // Find the start language object tag
 473                         $start = strpos($template, $tagStart, $end + 1);
 474                         if ($start === false)
 475                         {
 476                                 break;
 477                         }
 478
 479                         // look ahead to parse out all the variables
 480                         $i = $start + strlen($tagStart); // current position
 481                         $capture = ''; // current capture
 482                         $capturePos = $i; // the place to start capturing
 483                         $varNum = -1; // variable placeholder index
 484                         while ($i < strlen($template))
 485                         {
 486                                 if ($template[$i] == '=')
 487                                 {
 488                                         // backtrack to find the previous variable substitution
 489                                         $backPos = $i;
 490                                         while ($backPos >= $start)
 491                                         {
 492                                                 if ($template[$backPos] == '"')
 493                                                 {
 494                                                         // startPosition + length(startTag) + length(=\")
 495                                                         $varMap[intval($varNum)] = BSFunctions::Substring($template, $capturePos + 3, $backPos - 1);
 496                                                         // remove our old substitution from the capture
 497                                                         $capture = BSFunctions::Substring($template, $backPos + 1, $i);
 498                                                         break;
 499                                                 }
 500                                                 $backPos--;
 501                                         }
 502
 503                                         // do we have a valid index?
 504                                         if (intval($capture) > 0)
 505                                         {
 506                                                 // set aside the index and restart capturing
 507                                                 $varNum = $capture;
 508                                                 $capture = '';
 509                                                 $capturePos = $i;
 510                                         }
 511                                         else
 512                                         {
 513                                                 throw new Exception('Invalid language variable index "' . $capture . '"');
 514                                         }
 515                                 }
 516                                 else if ($template[$i] == '>' AND $template[$i - 1] == '"')
 517                                 {
 518                                         // the final variable substitution
 519                                         $varMap[intval($varNum)] = BSFunctions::Substring($template, $capturePos + 3, $i - 2);
 520                                         $varEnds = $i;
 521                                         break;
 522                                 }
 523
 524                                 $capture .= $template[$i];
 525                                 $i++;
 526                         }
 527
 528                         // locate the end tag
 529                         $end = strpos($template, $tagEnd, $i);
 530                         if ($end === false)
 531                         {
 532                                 break;
 533                         }
 534
 535                         // this is the string that gets variable replacement
 536                         $str = BSFunctions::Substring($template, $varEnds + 1, $end);
 537
 538                         // create the complete varmap
 539
 540                         for ($i = max(array_keys($varMap)); $i > 0; $i--)
 541                         {
 542                                 if (!isset($varMap[$i]))
 543                                 {
 544                                         $varMap[$i] = '<strong>[MISSING SUBSTITUTION INDEX: ' . $i . ']</strong>';
 545                                 }
 546                         }
 547
 548                         // put all the keys in corresponding argument order
 549                         ksort($varMap);
 550
 551                         // FINALLY, construct the call to sprintf()
 552                         $template = substr_replace($template, '" . ' . $this->langconst . '(\'' . $str . '\', "' . implode('", "', $varMap) . '") . "', $start, ($end + strlen($tagEnd)) - $start);
 553                 }
 554
 555                 return $template;
 556         }
 557
 558         // ###################################################################
 559         /**
 560         * Parser for in-line template conditionals
 561         *
 562         * @param        string  Template data awaiting processing
 563         *
 564         * @return       string  Parsed template data
 565         */
 566         private function _parseConditionals($template)
 567         {
 568                 // tag data
 569                 $tag_start = '<if condition=\"';
 570                 $tag_start_end = '\">';
 571                 $tag_else = '<else />';
 572                 $tag_end = '</if>';
 573
 574                 // tag stack
 575                 $stack = array();
 576
 577                 // the information about the current active tag
 578                 $tag_full = array();
 579                 $parsed = array();
 580
 581                 // start at 0
 582                 $offset = 0;
 583
 584                 while (1)
 585                 {
 586                         if (strpos($template, $tag_start) === false)
 587                         {
 588                                 break;
 589                         }
 590
 591                         for ($i = $offset; $i < strlen($template); $i++)
 592                         {
 593                                 // we've found ourselves a conditional!
 594                                 if (substr($template, $i, strlen($tag_start)) == $tag_start)
 595                                 {
 596                                         // push the position into the tag stack
 597                                         if ($tag_full)
 598                                         {
 599                                                 array_push($stack, $i);
 600                                         }
 601                                         else
 602                                         {
 603                                                 $tag_full['posi'] = $i;
 604                                         }
 605                                 }
 606                                 // locate else tags
 607                                 else if (substr($template, $i, strlen($tag_else)) == $tag_else)
 608                                 {
 609                                         if (sizeof($stack) == 0 AND !isset($tag_full['else']))
 610                                         {
 611                                                 $tag_full['else'] = $i;
 612                                         }
 613                                 }
 614                                 // do we have an end tag?
 615                                 else if (substr($template, $i, strlen($tag_end)) == $tag_end)
 616                                 {
 617                                         if (sizeof($stack) != 0)
 618                                         {
 619                                                 array_pop($stack);
 620                                                 continue;
 621                                         }
 622
 623                                         // calculate the position of the end tag
 624                                         $tag_full['posf'] = $i + strlen($tag_end) - 1;
 625
 626                                         // extract the entire conditional from the template
 627                                         $fullspread = substr($template, $tag_full['posi'], $tag_full['posf'] - $tag_full['posi'] + 1);
 628
 629                                         // remove the beginning tag
 630                                         $conditional = substr($fullspread, strlen($tag_start));
 631
 632                                         // find the end of the expression
 633                                         $temp_end = strpos($conditional, $tag_start_end);
 634
 635                                         // save the expression
 636                                         $parsed[0] = stripslashes(substr($conditional, 0, $temp_end));
 637
 638                                         // remove the expression from the conditional
 639                                         $conditional = substr($conditional, strlen($parsed[0]) + strlen($tag_start_end));
 640
 641                                         // remove the tailing end tag
 642                                         $conditional = substr($conditional, 0, strlen($conditional) - strlen($tag_end));
 643
 644                                         // handle the else
 645                                         if (isset($tag_full['else']))
 646                                         {
 647                                                 // now relative to the start of the <if>
 648                                                 $relpos = $tag_full['else'] - $tag_full['posi'];
 649
 650                                                 // calculate the length of the expression and opening tag
 651                                                 $length = strlen($parsed[0]) + strlen($tag_start) + strlen($tag_start_end);
 652
 653                                                 // relative to the start of iftrue
 654                                                 $elsepos = $relpos - $length;
 655
 656                                                 $parsed[1] = substr($conditional, 0, $elsepos);
 657                                                 $parsed[2] = substr($conditional, $elsepos + strlen($tag_else));
 658                                         }
 659                                         // no else to handle
 660                                         else
 661                                         {
 662                                                 $parsed[1] = $conditional;
 663                                                 $parsed[2] = '';
 664                                         }
 665
 666                                         // final parsed output
 667                                         $parsed = '" . ((' . stripslashes($parsed[0]) . ') ? "' . $parsed[1] . '" : "' . $parsed[2] . '") . "';
 668
 669                                         // replace the conditional
 670                                         $template = str_replace($fullspread, $parsed, $template);
 671
 672                                         // reset the parser
 673                                         $offset = $tag_full['posi'] + strlen($tag_start) + strlen($tag_start_end);
 674                                         $tag_full = array();
 675                                         $stack = array();
 676                                         $parsed = array();
 677                                         unset($fullspread, $conditional, $temp_end, $relpos, $length, $elsepos);
 678                                         break;
 679                                 }
 680                         }
 681                 }
 682
 683                 return $template;
 684         }
 685 }
 686
 687 // ###################################################################
 688 /**
 689 * Debugging function used to print characters in a string that are
 690 * around a certain position.
 691 *
 692 * @access       private
 693 *
 694 * @param        string  The haystack string
 695 * @param        integer Position to print around
 696 */
 697 function print_around($str, $pos)
 698 {
 699         echo '>>> PA >>>>>>>>[';
 700         echo htmlspecialchars($str[ $pos - 5 ]);
 701         echo htmlspecialchars($str[ $pos - 4 ]);
 702         echo htmlspecialchars($str[ $pos - 3 ]);
 703         echo htmlspecialchars($str[ $pos - 2 ]);
 704         echo htmlspecialchars($str[ $pos - 1 ]);
 705         echo '©';
 706         echo htmlspecialchars($str[ $pos + 0 ]);
 707         echo htmlspecialchars($str[ $pos + 1 ]);
 708         echo htmlspecialchars($str[ $pos + 2 ]);
 709         echo htmlspecialchars($str[ $pos + 3 ]);
 710         echo htmlspecialchars($str[ $pos + 4 ]);
 711         echo htmlspecialchars($str[ $pos + 5 ]);
 712         echo ']<<<<<<<< PA <<<';
 713 }
 714
 715 /*=====================================================================*\
 716 || ###################################################################
 717 || # $HeadURL$
 718 || # $Id$
 719 || ###################################################################
 720 \*=====================================================================*/
 721 ?>