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('svn binary could not be found');
  67                 }
  68
  69                 if (!preg_match('#^svn, version (.*?)\)$#i', trim($access[0])))
  70                 {
  71                         $viewsvn->trigger->error('svn binary does not pass test');
  72                 }
  73         }
  74
  75         /**
  76         * Prepares data for output
  77         *
  78         * @access       public
  79         *
  80         * @param        string  Standard data
  81         *
  82         * @return       string  Output-ready data
  83         */
  84         function format($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 . ' -r' . $revision . ' ' . $repospath . $path);
 180         }
 181
 182         /**
 183         * SVN Wrapper: blame
 184         *
 185         * @access       protected
 186         *
 187         * @param        string  Repository
 188         * @param        string  Path
 189         * @param        integer Revision
 190         *
 191         * @return       array   Lines of blame output
 192         */
 193         function blame($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), 'HEAD');
 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                 $revs = $this->fetch_revs($path);
 449
 450                 if ($current == 'HEAD')
 451                 {
 452                         $current = $this->fetch_head_rev($path);
 453                 }
 454
 455                 $index = array_search($current, $revs['revs']);
 456                 if ($current === false)
 457                 {
 458                         $message->trigger->error('revision ' . $current . ' is not in ' . $path);
 459                 }
 460
 461                 if (isset($revs['revs'][ $index + 1 ]))
 462                 {
 463                         return $revs['revs'][ $index + 1 ];
 464                 }
 465                 else
 466                 {
 467                         return -1;
 468                 }
 469         }
 470
 471         /**
 472         * Get a list of logs
 473         *
 474         * @access       public
 475         *
 476         * @param        string  Universal path
 477         *
 478         * @return       array   Log data
 479         */
 480         function fetch_logs($path)
 481         {
 482                 if (!isset($this->logs["$path"]))
 483                 {
 484                         $log = new SVNLog($this->registry->paths->fetch_repos($path), $this->registry->paths->fetch_path($path), 0, 0);
 485
 486                         $this->logs["$path"] = $log->fetch();
 487                 }
 488
 489                 return $this->logs["$path"];
 490         }
 491
 492         /**
 493         * Returns a given log entry for a path
 494         * and revision
 495         *
 496         * @access       public
 497         *
 498         * @param        string  Universal path
 499         * @param        integer Arbitrary revision
 500         *
 501         * @return       array   Log entry
 502         */
 503         function fetch_log($path, $rev)
 504         {
 505                 $logs = $this->fetch_logs($path);
 506
 507                 $rev = $this->registry->svn->rev($rev);
 508                 if ($rev == 'HEAD')
 509                 {
 510                         $rev = $this->fetch_head_rev($path);
 511                 }
 512
 513                 if (isset($logs["$rev"]))
 514                 {
 515                         return $logs["$rev"];
 516                 }
 517                 else
 518                 {
 519                         return null;
 520                 }
 521         }
 522 }
 523
 524 /**
 525 * Annotation/blame system; constructs an array
 526 * that is ready for output
 527 *
 528 * @package      ViewSVN
 529 * @version      $Id$
 530 */
 531 class SVNBlame
 532 {
 533         /**
 534         * Array of blame information
 535         * @var  array
 536         */
 537         var $blame = array();
 538
 539         /**
 540         * Raw "svn blame" output
 541         * @var  array
 542         */
 543         var $rawoutput;
 544
 545         /**
 546         * Constructor: create blame and store data
 547         *
 548         * @param        string  Repository
 549         * @param        string  Path
 550         * @param        integer Revision
 551         */
 552         function SVNBlame($repos, $path, $revision)
 553         {
 554                 global $viewsvn;
 555
 556                 $this->rawoutput = $viewsvn->svn->blame($repos, $path, $revision);
 557                 $this->process();
 558         }
 559
 560         /**
 561         * Returns blame for display
 562         *
 563         * @access       public
 564         *
 565         * @return       array   Blame data
 566         */
 567         function fetch()
 568         {
 569                 return $this->blame;
 570         }
 571
 572         /**
 573         * Parses the blame data
 574         *
 575         * @access       private
 576         */
 577         function process()
 578         {
 579                 $lineno = 1;
 580
 581                 foreach ($this->rawoutput AS $line)
 582                 {
 583                         if (preg_match('#^\s+([0-9]+)\s+([\w\.\-_]+)\s(.*)$#', $line, $matches))
 584                         {
 585                                 $this->blame[] = array(
 586                                         'rev'           => $matches[1],
 587                                         'author'        => $matches[2],
 588                                         'line'          => $matches[3],
 589                                         'lineno'        => $lineno++
 590                                 );
 591                         }
 592                         // a blank line
 593                         else if (preg_match('#^\s+([0-9]+)\s+([\w\.\-_]+)$#', $line, $matches))
 594                         {
 595                                 $this->blame[] = array(
 596                                         'rev'           => $matches[1],
 597                                         'author'        => $matches[2],
 598                                         'line'          => '',
 599                                         'lineno'        => $lineno++
 600                                 );
 601                         }
 602                 }
 603         }
 604 }
 605
 606 /**
 607 * Log management system; creates a complex list
 608 * of SVN log information
 609 *
 610 * @package      ViewSVN
 611 * @version      $Id$
 612 */
 613 class SVNLog
 614 {
 615         /**
 616         * Array of logs
 617         * @var  array
 618         */
 619         var $logs = array();
 620
 621         /**
 622         * Raw "svn log" output
 623         * @var  array
 624         */
 625         var $rawoutput;
 626
 627         /**
 628         * Constructor: create log store for the given file
 629         *
 630         * @param        string  Repository
 631         * @param        string  Path
 632         * @param        integer Lower revision
 633         * @param        integer Higher revision
 634         */
 635         function SVNLog($repos, $path, $lorev, $hirev)
 636         {
 637                 global $viewsvn;
 638
 639                 $this->rawoutput = $viewsvn->svn->log($repos, $path, $lorev, $hirev);
 640                 $this->process();
 641         }
 642
 643         /**
 644         * Returns logs for display
 645         *
 646         * @access       public
 647         *
 648         * @return       array   Log data
 649         */
 650         function fetch()
 651         {
 652                 return $this->logs;
 653         }
 654
 655         /**
 656         * Splits up the raw output into a usable log
 657         *
 658         * @access       private
 659         */
 660         function process()
 661         {
 662                 $lastrev = 0;
 663
 664                 for ($i = 1; $i <= count($this->rawoutput) - 1; $i++)
 665                 {
 666                         $line = $this->rawoutput["$i"];
 667
 668                         if (preg_match('#^r([0-9]*) \| (.*?) \| (....-..-.. ..:..:..) ([0-9\-]*) \((.*?)\) \| ([0-9]*) lines?$#', $line, $matches))
 669                         {
 670                                 if (isset($this->logs["$lastrev"]))
 671                                 {
 672                                         $this->logs["$lastrev"]['message'] = $this->strip_last_line($this->logs["$lastrev"]['message']);
 673                                 }
 674
 675                                 $this->logs["$matches[1]"] = array(
 676                                         'rev'           => $matches[1],
 677                                         'author'        => $matches[2],
 678                                         'date'          => $matches[3],
 679                                         'timezone'      => $matches[4],
 680                                         'lines'         => $matches[6],
 681                                         'message'       => ''
 682                                 );
 683
 684                                 $lastrev = $matches[1];
 685                         }
 686                         else if (preg_match('#^\s+([ADMR])\s(.*)#', $line, $matches))
 687                         {
 688                                 $this->logs["$lastrev"]['files'][] = array(
 689                                         'action'        => $matches[1],
 690                                         'file'          => $matches[2]
 691                                 );
 692                         }
 693                         else
 694                         {
 695                                 if (trim($line) != 'Changed paths:')
 696                                 {
 697                                         $this->logs["$lastrev"]['message'] .= $line . "\n";
 698                                 }
 699                         }
 700                 }
 701
 702                 if (isset($this->logs["$lastrev"]))
 703                 {
 704                         $this->logs["$lastrev"]['message'] = $this->strip_last_line($this->logs["$lastrev"]['message']);
 705                 }
 706         }
 707
 708         /**
 709         * Trims the last dash line off a message
 710         *
 711         * @access       private
 712         *
 713         * @param        string  Message with annoying-ass line
 714         *
 715         * @return       string  Clean string
 716         */
 717         function strip_last_line($string)
 718         {
 719                 return trim(preg_replace("#\n(.*?)\n$#", '', $string));
 720         }
 721 }
 722
 723 /**
 724 * Diff system; constructs a diff array that
 725 * is ready for output
 726 *
 727 * @package      ViewSVN
 728 */
 729 class SVNDiff
 730 {
 731         /**
 732         * Array of diff information
 733         * @var  array
 734         */
 735         var $diff = array();
 736
 737         /**
 738         * Raw "svn diff" output
 739         * @var  array
 740         */
 741         var $rawoutput;
 742
 743         /**
 744         * Constructor: create and store diff data
 745         *
 746         * @param        string  Repository
 747         * @param        string  Path
 748         * @param        integer Lower revision
 749         * @param        integer Higher revision
 750         */
 751         function SVNDiff($repos, $path, $lorev, $hirev)
 752         {
 753                 global $viewsvn;
 754
 755                 $this->rawoutput = $viewsvn->svn->diff($repos, $path, $lorev, $hirev);
 756                 $this->process();
 757         }
 758
 759         /**
 760         * Returns diffs for display
 761         *
 762         * @access       public
 763         *
 764         * @return       array   Diff data
 765         */
 766         function fetch()
 767         {
 768                 return $this->diff;
 769         }
 770
 771         /**
 772         * Processes and prepares diff data
 773         *
 774         * @access       private
 775         */
 776         function process()
 777         {
 778                 $chunk = 0;
 779                 $indexcounter = null;
 780
 781                 $delstack = array();
 782
 783                 foreach ($this->rawoutput AS $line)
 784                 {
 785                         if (preg_match('#^@@ \-([0-9]*),([0-9]*) \+([0-9]*),([0-9]*) @@$#', $line, $bits))
 786                         {
 787                                 $delstack = array();
 788                                 $this->diff["$index"][ ++$chunk ]['hunk'] = array('old' => array('line' => $bits[1], 'count' => $bits[2]), 'new' => array('line' => $bits[3], 'count' => $bits[4]));
 789                                 $lines['old'] = $this->diff["$index"]["$chunk"]['hunk']['old']['line'] - 1;
 790                                 $lines['new'] = $this->diff["$index"]["$chunk"]['hunk']['new']['line'] - 1;
 791                                 continue;
 792                         }
 793
 794                         if ($indexcounter <= 5 AND $indexcounter !== null)
 795                         {
 796                                 $indexcounter++;
 797                                 continue;
 798                         }
 799                         else if ($indexcounter == 5)
 800                         {
 801                                 $indexcounter = null;
 802                                 continue;
 803                         }
 804
 805                         if (preg_match('#^([\+\- ])(.*)#', $line, $matches))
 806                         {
 807                                 $act = $matches[1];
 808                                 $content = $matches[2];
 809
 810                                 if ($act == ' ')
 811                                 {
 812                                         $this->diff["$index"]["$chunk"][] = array(
 813                                                 'line'          => $content,
 814                                                 'act'           => '',
 815                                                 'oldlineno'     => ++$lines['old'],
 816                                                 'newlineno'     => ++$lines['new']
 817                                         );
 818
 819                                         $delstack = array();
 820                                 }
 821                                 else if ($act == '+')
 822                                 {
 823                                         // potential line delta
 824                                         if (count($delstack) > 0)
 825                                         {
 826                                                 $lastline = array_shift($delstack);
 827
 828                                                 if ($delta = @$this->fetch_diff_extent($lastline['line'], $content))
 829                                                 {
 830                                                         // create two sets of ends for the two contents
 831                                                         $delta['endo'] = strlen($lastline['line']) - $delta['end'];
 832                                                         $delta['endn'] = strlen($content) - $delta['end'];
 833
 834                                                         $diffo = $delta['endo'] - $delta['start'];
 835                                                         $diffn = $delta['endn'] - $delta['start'];
 836
 837                                                         if (strlen($lastline['line']) > $delta['endo'] - $diffo)
 838                                                         {
 839                                                                 $removed = substr($lastline['line'], $delta['start'], $diffo);
 840                                                                 $this->diff["$index"]["$chunk"]["$lastline[INDEX]"]['line'] = substr_replace($lastline['line'], '{@-' . '-}' . $removed . '{/@-' . '-}', $delta['start'], $diffo);
 841                                                         }
 842
 843                                                         if (strlen($content) > $delta['endn'] - $diffn)
 844                                                         {
 845                                                                 $added = substr($content, $delta['start'], $diffn);
 846                                                                 $content = substr_replace($content, '{@+' . '+}' . $added . '{/@+' . '+}', $delta['start'], $diffn);
 847                                                         }
 848                                                 }
 849                                         }
 850
 851                                         $this->diff["$index"]["$chunk"][] = array(
 852                                                 'line'          => $content,
 853                                                 'act'           => '+',
 854                                                 'oldlineno'     => '',
 855                                                 'newlineno'     => ++$lines['new']
 856                                         );
 857                                 }
 858                                 else if ($act == '-')
 859                                 {
 860                                         $this->diff["$index"]["$chunk"][] = $thearray = array(
 861                                                 'line'          => $content,
 862                                                 'act'           => '-',
 863                                                 'oldlineno'     => ++$lines['old'],
 864                                                 'newlineno'     => ''
 865                                         );
 866
 867                                         $key = count($this->diff["$index"]["$chunk"]) - 2;
 868                                         $thearray['INDEX'] = $key;
 869
 870                                         array_push($delstack, $thearray);
 871                                 }
 872                         }
 873                         // whitespace lines
 874                         else
 875                         {
 876                                 if (preg_match('#^Index: (.*?)$#', $line, $matches))
 877                                 {
 878                                         $index = $matches[1];
 879                                         $indexcounter = 1;
 880                                         $chunk = 0;
 881                                         continue;
 882                                 }
 883
 884                                 $this->diff["$index"]["$chunk"][] = array(
 885                                         'line'          => '',
 886                                         'act'           => '',
 887                                         'oldlineno'     => ++$lines['old'],
 888                                         'newlineno'     => ++$lines['new']
 889                                 );
 890
 891                                 $delstack = array();
 892                         }
 893                 }
 894         }
 895
 896         /**
 897         * Returns the amount of change that occured
 898         * between two lines
 899         *
 900         * @access       private
 901         *
 902         * @param        string  Old line
 903         * @param        string  New line
 904         *
 905         * @return       array   Difference of positions
 906         */
 907         function fetch_diff_extent($old, $new)
 908         {
 909                 $start = 0;
 910                 $min = min(strlen($old), strlen($new));
 911
 912                 for ($start = 0; $start < $min; $start++)
 913                 {
 914                         if ($old{"$start"} != $new{"$start"})
 915                         {
 916                                 break;
 917                         }
 918                 }
 919
 920                 $max = max(strlen($old), strlen($new));
 921
 922                 for ($end = 0; $end < $min; $end++)
 923                 {
 924                         $oldpos = strlen($old) - $end;
 925                         $newpos = strlen($new) - $end;
 926
 927                         if ($old{"$oldpos"} != $new{"$newpos"})
 928                         {
 929                                 break;
 930                         }
 931                 }
 932
 933                 $end--;
 934
 935                 if ($start == 0 AND $end == $max)
 936                 {
 937                         return false;
 938                 }
 939
 940                 return array('start' => $start, 'end' => $end);
 941         }
 942 }
 943
 944 /*=====================================================================*\
 945 || ###################################################################
 946 || # $HeadURL$
 947 || # $Id$
 948 || ###################################################################
 949 \*=====================================================================*/
 950 ?>