includes/svnlib.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # ViewSVN [#]version[#]
   5 || # Copyright ©2002-[#]year[#] Iris Studios, Inc.
   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 * Command line interface with the SVN commands
  24 *
  25 * @package      ViewSVN
  26 */
  27
  28 /**
  29 * Interacts with the command line subsystem to
  30 * access SVN information
  31 *
  32 * @package      ViewSVN
  33 * @version      $Id$
  34 */
  35 class SVNLib
  36 {
  37         /**
  38         * Path to the SVN binary
  39         * @var  string
  40         */
  41         var $svnpath;
  42
  43         /**
  44         * Common command system
  45         * @var  object
  46         */
  47         var $common;
  48
  49         /**
  50         * Constructor: validate SVN path
  51         *
  52         * @param        string  Path to SVN binary
  53         */
  54         function SVNLib($svnpath)
  55         {
  56                 global $viewsvn;
  57
  58                 $this->svnpath = $viewsvn->shell->cmd($svnpath);
  59
  60                 $this->common =& new SVNCommon();
  61
  62                 $access = $viewsvn->shell->exec($this->svnpath . ' --version');
  63
  64                 if (!$access)
  65                 {
  66                         $viewsvn->trigger->error($viewsvn->lang->string('The SVN binary could not be located'));
  67                 }
  68
  69                 if (!preg_match('#^svn, version (.*?)\)$#i', trim($access[0])))
  70                 {
  71                         $viewsvn->trigger->error($viewsvn->lang->string('The SVN binary does not appear to be valid (it failed our tests)'));
  72                 }
  73         }
  74
  75         /**
  76         * Prepares data for output
  77         *
  78         * @access       public
  79         *
  80         * @param        string  Standard data
  81         *
  82         * @return       string  Output-ready data
  83         */
  84         function format($string)
  85         {
  86                 // convert entities
  87                 $string = htmlspecialchars($string);
  88
  89                 // tabs to 5 spaces
  90                 $string = str_replace("\t", '     ', $string);
  91
  92                 // spaces to nbsp
  93                 if (true)
  94                 {
  95                         $string = preg_replace('#( +)#e', '$this->format_spaces("\1")', $string);
  96                 }
  97                 // no word wrap
  98                 else
  99                 {
 100                         $string = str_replace(' ', '&nbsp;', $string);
 101                 }
 102
 103                 // convert advanced diff
 104                 $string = str_replace(array('{@+' . '+}', '{@-' . '-}'), array('<span class="diff_add_bit">', '<span class="diff_del_bit">'), $string);
 105                 $string = str_replace(array('{/@+' . '+}', '{/@-' . '-}'), '</span>', $string);
 106
 107                 // nl2br
 108                 $string = nl2br($string);
 109
 110                 return $string;
 111         }
 112
 113         /**
 114         * Counts the spaces and replaces two or more ones
 115         *
 116         * @access       private
 117         *
 118         * @param        string  Spaced string
 119         *
 120         * @return       string  &nbsp;'d string
 121         */
 122         function format_spaces($thestring)
 123         {
 124                 if (strlen($thestring) >= 2)
 125                 {
 126                         $thestring = str_replace(' ', '&nbsp;', $thestring);
 127                 }
 128
 129                 return $thestring;
 130         }
 131
 132         /**
 133         * Executes the SVN binary
 134         *
 135         * @access       private
 136         *
 137         * @param        string  Command
 138         *
 139         * @return       array   Output
 140         */
 141         function svn($command)
 142         {
 143                 global $viewsvn;
 144
 145                 $output = $viewsvn->shell->exec($this->svnpath . ' ' . $command . ' 2>&1');
 146
 147                 // make sure that we keep escaped chars
 148                 //$output = str_replace(array('\t', '\n', '\r'), array('\\\t', '\\\n', '\\\r'), $output);
 149                 //$output = preg_replace('#\\\(.)#', '\\\\\\\\' . '\1', $output);
 150                 $output = str_replace('\\', '\\\\', $output);
 151
 152                 $temp = implode("\n", $output);
 153                 if (strpos($temp, '(apr' . '_err=') !== false)
 154                 {
 155                         $viewsvn->trigger->error(nl2br($temp));
 156                 }
 157                 return $output;
 158         }
 159
 160         /**
 161         * SVN Wrapper: standard command system
 162         *
 163         * @access       private
 164         *
 165         * @param        string  SVN command
 166         * @param        string  Repository
 167         * @param        string  Path
 168         * @param        integer Revision
 169         *
 170         * @return       array   Lines of output
 171         */
 172         function std($command, $repos, $path, $revision)
 173         {
 174                 global $viewsvn;
 175
 176                 $revision = $this->rev($revision);
 177                 $repospath = $viewsvn->repos->fetch_path($repos, false);
 178
 179                 return $this->svn($command . ' ' . $repospath . $path . '@' . $revision);
 180         }
 181
 182         /**
 183         * SVN Wrapper: blame
 184         *
 185         * @access       protected
 186         *
 187         * @param        string  Repository
 188         * @param        string  Path
 189         * @param        integer Revision
 190         *
 191         * @return       array   Lines of blame output
 192         */
 193         function blame($repos, $path, $revision)
 194         {
 195                 return $this->std('blame', $repos, $path, $revision);
 196         }
 197
 198         /**
 199         * SVN Wrapper: cat
 200         *
 201         * @access       protected
 202         *
 203         * @param        string  Repository
 204         * @param        string  Path
 205         * @param        integer Revision
 206         *
 207         * @return       array   Lines of cat output
 208         */
 209         function cat($repos, $path, $revision)
 210         {
 211                 return $this->std('cat', $repos, $path, $revision);
 212         }
 213
 214         /**
 215         * SVN Wrapper: diff
 216         *
 217         * @access       protected
 218         *
 219         * @param        string  Repository
 220         * @param        string  Path
 221         * @param        integer Lower revision
 222         * @param        integer Higher revision
 223         *
 224         * @return       array   Lines of diff output
 225         */
 226         function diff($repos, $path, $lorev, $hirev)
 227         {
 228                 global $viewsvn;
 229
 230                 $hirev = $this->rev($hirev);
 231                 $lorev = $this->rev($lorev);
 232                 if ($lorev == 'HEAD')
 233                 {
 234                         $lorev = 1;
 235                 }
 236
 237                 if (is_integer($hirev) AND is_integer($lorev))
 238                 {
 239                         if ($lorev > $hirev)
 240                         {
 241                                 $lorev = $hirev - 1;
 242                         }
 243                         if ($lorev == $hirev)
 244                         {
 245                                 $lorev = 0;
 246                         }
 247                 }
 248
 249                 $repospath = $viewsvn->repos->fetch_path($repos, false);
 250
 251                 return $this->svn('diff -r' . $lorev . ':' . $hirev . ' ' . $repospath . $path);
 252         }
 253
 254         /**
 255         * SVN Wrapper: log
 256         *
 257         * @access       protected
 258         *
 259         * @param        string  Repository
 260         * @param        string  Path
 261         * @param        integer Lower revision
 262         * @param        integer Higher revision
 263         *
 264         * @return       array   Lines of log output
 265         */
 266         function log($repos, $path, $lorev, $hirev)
 267         {
 268                 global $viewsvn;
 269
 270                 $hirev = $this->rev($hirev);
 271                 $lorev = $this->rev($hirev);
 272                 if ($lorev == 'HEAD')
 273                 {
 274                         $lorev = 0;
 275                 }
 276
 277                 if (is_integer($hirev) AND is_integer($lorev))
 278                 {
 279                         if ($lorev > $hirev)
 280                         {
 281                                 $lorev = $hirev - 1;
 282                         }
 283                         if ($lorev == $hirev)
 284                         {
 285                                 $lorev = 0;
 286                         }
 287                 }
 288
 289                 $repospath = $viewsvn->repos->fetch_path($repos, false);
 290
 291                 return $this->svn('log -v -r' . $hirev . ':' . $lorev . ' ' . $repospath . $path);
 292         }
 293
 294         /**
 295         * SVN Wrapper: ls (list)
 296         *
 297         * @access       protected
 298         *
 299         * @param        string  Repository
 300         * @param        string  Path
 301         * @param        integer Revision
 302         *
 303         * @return       array   Lines of list output
 304         */
 305         function ls($repos, $path, $revision)
 306         {
 307                 return $this->std('list', $repos, $path, $revision);
 308         }
 309
 310         /**
 311         * Generates a clean revision number
 312         *
 313         * @access       public
 314         *
 315         * @param        integer Revision number
 316         *
 317         * @return       mixed   Cleaned revision or HEAD
 318         */
 319         function rev($revision)
 320         {
 321                 if (($revision = intval($revision)) < 1)
 322                 {
 323                         $revision = 'HEAD';
 324                 }
 325                 return $revision;
 326         }
 327 }
 328
 329 /**
 330 * Commonly executed SVN commands that return data
 331 * used in many parts of the system
 332 *
 333 * @package      ViewSVN
 334 * @version      $Id$
 335 */
 336 class SVNCommon
 337 {
 338         /**
 339         * Registry object
 340         * @var  object
 341         */
 342         var $registry;
 343
 344         /**
 345         * List of revisions
 346         * @var  array
 347         */
 348         var $revisions;
 349
 350         /**
 351         * List of logs
 352         * @var  array
 353         */
 354         var $logs;
 355
 356         /**
 357         * Constructor: bind with registry
 358         */
 359         function SVNCommon()
 360         {
 361                 global $viewsvn;
 362
 363                 $this->registry =& $viewsvn;
 364         }
 365
 366         /**
 367         * Checks to see if the given universal path is
 368         * a directory
 369         *
 370         * @access       public
 371         *
 372         * @param        string  Universal path
 373         *
 374         * @return       bool    Directory or not
 375         */
 376         function isdir($path)
 377         {
 378                 $output = $this->registry->svn->std('info', $this->registry->paths->fetch_repos($path), $this->registry->paths->fetch_path($path), $this->registry->paths->fetch_rev_num());
 379
 380                 foreach ($output AS $line)
 381                 {
 382                         if (preg_match('#^Node Kind: (.*)#', $line, $matches))
 383                         {
 384                                 if (trim(strtolower($matches[1])) == 'directory')
 385                                 {
 386                                         return true;
 387                                 }
 388                         }
 389                 }
 390
 391                 return false;
 392         }
 393
 394         /**
 395         * Get a list of revisions for a path
 396         *
 397         * @access       public
 398         *
 399         * @param        string  Universal path
 400         *
 401         * @return       array   Key revisions
 402         */
 403         function fetch_revs($path)
 404         {
 405                 if (!isset($this->revisions["$path"]))
 406                 {
 407                         $log = $this->fetch_logs($path);
 408
 409                         $revs = array_keys($log);
 410
 411                         $this->revisions["$path"] = array(
 412                                 'HEAD'  => $revs[0],
 413                                 'START' => $revs[ count($revs) - 1 ],
 414                                 'revs'  => $revs
 415                         );
 416                 }
 417
 418                 return $this->revisions["$path"];
 419         }
 420
 421         /**
 422         * Gets the revision that is marked as HEAD
 423         *
 424         * @access       public
 425         *
 426         * @param        string  Universal path
 427         *
 428         * @return       integer Revision
 429         */
 430         function fetch_head_rev($path)
 431         {
 432                 $revs = $this->fetch_revs($path);
 433                 return $revs['HEAD'];
 434         }
 435
 436         /**
 437         * Returns the previous revision to the one given
 438         *
 439         * @access       public
 440         *
 441         * @param        string  Universal path
 442         * @param        integer Arbitrary revision
 443         *
 444         * @return       integer Previous revision (-1 if none)
 445         */
 446         function fetch_prev_rev($path, $current)
 447         {
 448                 global $viewsvn;
 449
 450                 $revs = $this->fetch_revs($path);
 451
 452                 if ($current == 'HEAD')
 453                 {
 454                         $current = $this->fetch_head_rev($path);
 455                 }
 456
 457                 $index = array_search($current, $revs['revs']);
 458                 if ($current === false)
 459                 {
 460                         $message->trigger->error(sprintf($viewsvn->lang->string('Revision r%1$s is not in path %2$s'), $current, $path));
 461                 }
 462
 463                 if (isset($revs['revs'][ $index + 1 ]))
 464                 {
 465                         return $revs['revs'][ $index + 1 ];
 466                 }
 467                 else
 468                 {
 469                         return -1;
 470                 }
 471         }
 472
 473         /**
 474         * Get a list of logs
 475         *
 476         * @access       public
 477         *
 478         * @param        string  Universal path
 479         *
 480         * @return       array   Log data
 481         */
 482         function fetch_logs($path)
 483         {
 484                 if (!isset($this->logs["$path"]))
 485                 {
 486                         $log = new SVNLog($this->registry->paths->fetch_repos($path), $this->registry->paths->fetch_path($path), 0, $this->registry->paths->fetch_rev_num());
 487
 488                         $this->logs["$path"] = $log->fetch();
 489                 }
 490
 491                 return $this->logs["$path"];
 492         }
 493
 494         /**
 495         * Returns a given log entry for a path
 496         * and revision
 497         *
 498         * @access       public
 499         *
 500         * @param        string  Universal path
 501         * @param        integer Arbitrary revision
 502         *
 503         * @return       array   Log entry
 504         */
 505         function fetch_log($path, $rev)
 506         {
 507                 $logs = $this->fetch_logs($path);
 508
 509                 $rev = $this->registry->svn->rev($rev);
 510                 if ($rev == 'HEAD')
 511                 {
 512                         $rev = $this->fetch_head_rev($path);
 513                 }
 514
 515                 if (isset($logs["$rev"]))
 516                 {
 517                         return $logs["$rev"];
 518                 }
 519                 else
 520                 {
 521                         $keys = array_keys($logs);
 522                         sort($keys);
 523
 524                         for ($i = 0; $i < count($keys); $i++)
 525                         {
 526                                 if ($rev > $keys["$i"] AND $rev < $keys[ $i + 1 ])
 527                                 {
 528                                         return $logs["$keys[$i]"];
 529                                 }
 530                         }
 531
 532                         return null;
 533                 }
 534         }
 535
 536         /**
 537         * Prints the file changed list
 538         *
 539         * @access       public
 540         *
 541         * @public       array   List of file changes
 542         * @public       string  The repository
 543         * @public       integer Current revision
 544         *
 545         * @return       string  Processed HTML
 546         */
 547         function construct_file_changes($changes, $repos, $revision)
 548         {
 549                 global $viewsvn;
 550
 551                 $files = '';
 552
 553                 foreach ($changes AS $file)
 554                 {
 555                         switch ($file['action'])
 556                         {
 557                                 case 'A':
 558                                         $class = 'file_add';
 559                                         $tooltip = $viewsvn->lang->string('Added');
 560                                         break;
 561                                 case 'D':
 562                                         $class = 'file_delete';
 563                                         $tooltip = $viewsvn->lang->string('Deleted');
 564                                         break;
 565                                 case 'M':
 566                                         $class = 'file_modify';
 567                                         $tooltip = $viewsvn->lang->string('Modified');
 568                                         break;
 569                                 case 'R':
 570                                         $class = 'file_replace';
 571                                         $tooltip = $viewsvn->lang->string('Replaced');
 572                                         break;
 573                         }
 574
 575                         $show['from'] = (bool)$file['from'];
 576
 577                         if ($file['from'])
 578                         {
 579                                 $class = 'file_move';
 580                                 $tooltip = 'Moved/Copied';
 581                                 preg_match('#(.*):([0-9]+)#', $file['from'], $matches);
 582                                 $link['from'] = $viewsvn->paths->out('view.php' . $viewsvn->paths->fetch_rev_str(false, $matches[2]), $repos . $matches[1]);
 583                         }
 584
 585                         $link['file'] = $viewsvn->paths->out('view.php' . $viewsvn->paths->fetch_rev_str(false, $revision), $repos . $file['file']);
 586
 587                         eval('$files .= "' . $viewsvn->template->fetch('file_change') . '";');
 588                 }
 589
 590                 return $files;
 591         }
 592 }
 593
 594 /**
 595 * Annotation/blame system; constructs an array
 596 * that is ready for output
 597 *
 598 * @package      ViewSVN
 599 * @version      $Id$
 600 */
 601 class SVNBlame
 602 {
 603         /**
 604         * Array of blame information
 605         * @var  array
 606         */
 607         var $blame = array();
 608
 609         /**
 610         * Raw "svn blame" output
 611         * @var  array
 612         */
 613         var $rawoutput;
 614
 615         /**
 616         * Constructor: create blame and store data
 617         *
 618         * @param        string  Repository
 619         * @param        string  Path
 620         * @param        integer Revision
 621         */
 622         function SVNBlame($repos, $path, $revision)
 623         {
 624                 global $viewsvn;
 625
 626                 $this->rawoutput = $viewsvn->svn->blame($repos, $path, $revision);
 627                 $this->process();
 628         }
 629
 630         /**
 631         * Returns blame for display
 632         *
 633         * @access       public
 634         *
 635         * @return       array   Blame data
 636         */
 637         function fetch()
 638         {
 639                 return $this->blame;
 640         }
 641
 642         /**
 643         * Parses the blame data
 644         *
 645         * @access       private
 646         */
 647         function process()
 648         {
 649                 $lineno = 1;
 650
 651                 foreach ($this->rawoutput AS $line)
 652                 {
 653                         if (preg_match('#^\s+([0-9]+)\s+([\w\.\-_]+)\s(.*)$#', $line, $matches))
 654                         {
 655                                 $this->blame[] = array(
 656                                         'rev'           => $matches[1],
 657                                         'author'        => $matches[2],
 658                                         'line'          => $matches[3],
 659                                         'lineno'        => $lineno++
 660                                 );
 661                         }
 662                         // a blank line
 663                         else if (preg_match('#^\s+([0-9]+)\s+([\w\.\-_]+)$#', $line, $matches))
 664                         {
 665                                 $this->blame[] = array(
 666                                         'rev'           => $matches[1],
 667                                         'author'        => $matches[2],
 668                                         'line'          => '',
 669                                         'lineno'        => $lineno++
 670                                 );
 671                         }
 672                 }
 673         }
 674 }
 675
 676 /**
 677 * Log management system; creates a complex list
 678 * of SVN log information
 679 *
 680 * @package      ViewSVN
 681 * @version      $Id$
 682 */
 683 class SVNLog
 684 {
 685         /**
 686         * Array of logs
 687         * @var  array
 688         */
 689         var $logs = array();
 690
 691         /**
 692         * Raw "svn log" output
 693         * @var  array
 694         */
 695         var $rawoutput;
 696
 697         /**
 698         * Constructor: create log store for the given file
 699         *
 700         * @param        string  Repository
 701         * @param        string  Path
 702         * @param        integer Lower revision
 703         * @param        integer Higher revision
 704         */
 705         function SVNLog($repos, $path, $lorev, $hirev)
 706         {
 707                 global $viewsvn;
 708
 709                 $this->rawoutput = $viewsvn->svn->log($repos, $path, $lorev, $hirev);
 710                 $this->process();
 711         }
 712
 713         /**
 714         * Returns logs for display
 715         *
 716         * @access       public
 717         *
 718         * @return       array   Log data
 719         */
 720         function fetch()
 721         {
 722                 return $this->logs;
 723         }
 724
 725         /**
 726         * Splits up the raw output into a usable log
 727         *
 728         * @access       private
 729         */
 730         function process()
 731         {
 732                 $lastrev = 0;
 733
 734                 for ($i = 1; $i <= count($this->rawoutput) - 1; $i++)
 735                 {
 736                         $line = $this->rawoutput["$i"];
 737
 738                         if (preg_match('#^r([0-9]*) \| (.*?) \| (....-..-.. ..:..:..) ([0-9\-]*) \((.*?)\) \| ([0-9]*) lines?$#', $line, $matches))
 739                         {
 740                                 if (isset($this->logs["$lastrev"]))
 741                                 {
 742                                         $this->logs["$lastrev"]['message'] = $this->strip_last_line($this->logs["$lastrev"]['message']);
 743                                 }
 744
 745                                 $this->logs["$matches[1]"] = array(
 746                                         'rev'           => $matches[1],
 747                                         'author'        => $matches[2],
 748                                         'date'          => $matches[3],
 749                                         'timezone'      => $matches[4],
 750                                         'lines'         => $matches[6],
 751                                         'message'       => ''
 752                                 );
 753
 754                                 $lastrev = $matches[1];
 755                         }
 756                         else if (preg_match('#^\s+([ADMR])\s(.*)#', $line, $matches))
 757                         {
 758                                 if (preg_match('#(.*) \(from (.*?)\)$#', $matches[2], $amatches))
 759                                 {
 760                                         $matches[2] = $amatches[1];
 761                                 }
 762
 763                                 $this->logs["$lastrev"]['files'][] = array(
 764                                         'action'        => $matches[1],
 765                                         'file'          => trim($matches[2]),
 766                                         'from'          => (isset($amatches[2]) ? $amatches[2] : '')
 767                                 );
 768                         }
 769                         else
 770                         {
 771                                 if (trim($line) != 'Changed paths:')
 772                                 {
 773                                         $this->logs["$lastrev"]['message'] .= $line . "\n";
 774                                 }
 775                         }
 776                 }
 777
 778                 if (isset($this->logs["$lastrev"]))
 779                 {
 780                         $this->logs["$lastrev"]['message'] = $this->strip_last_line($this->logs["$lastrev"]['message']);
 781                 }
 782         }
 783
 784         /**
 785         * Trims the last dash line off a message
 786         *
 787         * @access       private
 788         *
 789         * @param        string  Message with annoying-ass line
 790         *
 791         * @return       string  Clean string
 792         */
 793         function strip_last_line($string)
 794         {
 795                 return trim(preg_replace("#\n(.*?)\n$#", '', $string));
 796         }
 797 }
 798
 799 /**
 800 * Diff system; constructs a diff array that
 801 * is ready for output
 802 *
 803 * @package      ViewSVN
 804 */
 805 class SVNDiff
 806 {
 807         /**
 808         * Array of diff information
 809         * @var  array
 810         */
 811         var $diff = array();
 812
 813         /**
 814         * Raw "svn diff" output
 815         * @var  array
 816         */
 817         var $rawoutput;
 818
 819         /**
 820         * Constructor: create and store diff data
 821         *
 822         * @param        string  Repository
 823         * @param        string  Path
 824         * @param        integer Lower revision
 825         * @param        integer Higher revision
 826         */
 827         function SVNDiff($repos, $path, $lorev, $hirev)
 828         {
 829                 global $viewsvn;
 830
 831                 $this->rawoutput = $viewsvn->svn->diff($repos, $path, $lorev, $hirev);
 832                 $this->process();
 833         }
 834
 835         /**
 836         * Returns diffs for display
 837         *
 838         * @access       public
 839         *
 840         * @return       array   Diff data
 841         */
 842         function fetch()
 843         {
 844                 return $this->diff;
 845         }
 846
 847         /**
 848         * Processes and prepares diff data
 849         *
 850         * @access       private
 851         */
 852         function process()
 853         {
 854                 $chunk = 0;
 855                 $indexcounter = null;
 856
 857                 $delstack = array();
 858
 859                 foreach ($this->rawoutput AS $line)
 860                 {
 861                         if (preg_match('#^@@ \-([0-9]*),([0-9]*) \+([0-9]*),([0-9]*) @@$#', $line, $bits))
 862                         {
 863                                 $delstack = array();
 864                                 $this->diff["$index"][ ++$chunk ]['hunk'] = array('old' => array('line' => $bits[1], 'count' => $bits[2]), 'new' => array('line' => $bits[3], 'count' => $bits[4]));
 865                                 $lines['old'] = $this->diff["$index"]["$chunk"]['hunk']['old']['line'] - 1;
 866                                 $lines['new'] = $this->diff["$index"]["$chunk"]['hunk']['new']['line'] - 1;
 867                                 continue;
 868                         }
 869
 870                         if ($indexcounter <= 3 AND $indexcounter !== null)
 871                         {
 872                                 //echo $line . "\n";
 873                                 $indexcounter++;
 874                                 continue;
 875                         }
 876                         else if ($indexcounter == 3)
 877                         {
 878                                 $indexcounter = null;
 879                                 //echo "\n\n\n";
 880                                 continue;
 881                         }
 882
 883                         if (preg_match('#^([\+\- ])(.*)#', $line, $matches))
 884                         {
 885                                 $act = $matches[1];
 886                                 $content = $matches[2];
 887
 888                                 if ($act == ' ')
 889                                 {
 890                                         $this->diff["$index"]["$chunk"][] = array(
 891                                                 'line'          => $content,
 892                                                 'act'           => '',
 893                                                 'oldlineno'     => ++$lines['old'],
 894                                                 'newlineno'     => ++$lines['new']
 895                                         );
 896
 897                                         $delstack = array();
 898                                 }
 899                                 else if ($act == '+')
 900                                 {
 901                                         // potential line delta
 902                                         if (count($delstack) > 0)
 903                                         {
 904                                                 $lastline = array_shift($delstack);
 905
 906                                                 if ($delta = @$this->fetch_diff_extent($lastline['line'], $content))
 907                                                 {
 908                                                         // create two sets of ends for the two contents
 909                                                         $delta['endo'] = strlen($lastline['line']) - $delta['end'];
 910                                                         $delta['endn'] = strlen($content) - $delta['end'];
 911
 912                                                         $diffo = $delta['endo'] - $delta['start'];
 913                                                         $diffn = $delta['endn'] - $delta['start'];
 914
 915                                                         if (strlen($lastline['line']) > $delta['endo'] - $diffo)
 916                                                         {
 917                                                                 $removed = substr($lastline['line'], $delta['start'], $diffo);
 918                                                                 $this->diff["$index"]["$chunk"]["$lastline[INDEX]"]['line'] = substr_replace($lastline['line'], '{@-' . '-}' . $removed . '{/@-' . '-}', $delta['start'], $diffo);
 919                                                         }
 920
 921                                                         if (strlen($content) > $delta['endn'] - $diffn)
 922                                                         {
 923                                                                 $added = substr($content, $delta['start'], $diffn);
 924                                                                 $content = substr_replace($content, '{@+' . '+}' . $added . '{/@+' . '+}', $delta['start'], $diffn);
 925                                                         }
 926                                                 }
 927                                         }
 928
 929                                         $this->diff["$index"]["$chunk"][] = array(
 930                                                 'line'          => $content,
 931                                                 'act'           => '+',
 932                                                 'oldlineno'     => '',
 933                                                 'newlineno'     => ++$lines['new']
 934                                         );
 935                                 }
 936                                 else if ($act == '-')
 937                                 {
 938                                         $this->diff["$index"]["$chunk"][] = $thearray = array(
 939                                                 'line'          => $content,
 940                                                 'act'           => '-',
 941                                                 'oldlineno'     => ++$lines['old'],
 942                                                 'newlineno'     => ''
 943                                         );
 944
 945                                         $key = count($this->diff["$index"]["$chunk"]) - 2;
 946                                         $thearray['INDEX'] = $key;
 947
 948                                         array_push($delstack, $thearray);
 949                                 }
 950                         }
 951                         // whitespace lines
 952                         else
 953                         {
 954                                 if (preg_match('#^Index: (.*?)$#', $line, $matches))
 955                                 {
 956                                         $index = $matches[1];
 957                                         $indexcounter = 1;
 958                                         $chunk = 0;
 959                                         continue;
 960                                 }
 961
 962                                 $this->diff["$index"]["$chunk"][] = array(
 963                                         'line'          => '',
 964                                         'act'           => '',
 965                                         'oldlineno'     => ++$lines['old'],
 966                                         'newlineno'     => ++$lines['new']
 967                                 );
 968
 969                                 $delstack = array();
 970                         }
 971                 }
 972         }
 973
 974         /**
 975         * Returns the amount of change that occured
 976         * between two lines
 977         *
 978         * @access       private
 979         *
 980         * @param        string  Old line
 981         * @param        string  New line
 982         *
 983         * @return       array   Difference of positions
 984         */
 985         function fetch_diff_extent($old, $new)
 986         {
 987                 $start = 0;
 988                 $min = min(strlen($old), strlen($new));
 989
 990                 for ($start = 0; $start < $min; $start++)
 991                 {
 992                         if ($old{"$start"} != $new{"$start"})
 993                         {
 994                                 break;
 995                         }
 996                 }
 997
 998                 $max = max(strlen($old), strlen($new));
 999
1000                 for ($end = 0; $end < $min; $end++)
1001                 {
1002                         $oldpos = strlen($old) - $end;
1003                         $newpos = strlen($new) - $end;
1004
1005                         if ($old{"$oldpos"} != $new{"$newpos"})
1006                         {
1007                                 break;
1008                         }
1009                 }
1010
1011                 $end--;
1012
1013                 if ($start == 0 AND $end == $max)
1014                 {
1015                         return false;
1016                 }
1017
1018                 return array('start' => $start, 'end' => $end);
1019         }
1020 }
1021
1022 /*=====================================================================*\
1023 || ###################################################################
1024 || # $HeadURL$
1025 || # $Id$
1026 || ###################################################################
1027 \*=====================================================================*/
1028 ?>