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| 1 | <?php |
| 2 | /** |
| 3 | * |
| 4 | * This file is part of the phpBB Forum Software package. |
| 5 | * |
| 6 | * @copyright (c) phpBB Limited <https://www.phpbb.com> |
| 7 | * @license GNU General Public License, version 2 (GPL-2.0) |
| 8 | * |
| 9 | * For full copyright and license information, please see |
| 10 | * the docs/CREDITS.txt file. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | /** |
| 15 | * @ignore |
| 16 | */ |
| 17 | if (!defined('IN_PHPBB')) |
| 18 | { |
| 19 | exit; |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * Code from pear.php.net, Text_Diff-1.1.0 package |
| 24 | * http://pear.php.net/package/Text_Diff/ |
| 25 | * |
| 26 | * Modified by phpBB Limited to meet our coding standards |
| 27 | * and being able to integrate into phpBB |
| 28 | * |
| 29 | * General API for generating and formatting diffs - the differences between |
| 30 | * two sequences of strings. |
| 31 | * |
| 32 | * Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 33 | * Copyright 2004-2008 The Horde Project (http://www.horde.org/) |
| 34 | * |
| 35 | * @package diff |
| 36 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 37 | */ |
| 38 | class diff |
| 39 | { |
| 40 | /** |
| 41 | * Array of changes. |
| 42 | * @var array |
| 43 | */ |
| 44 | var $_edits; |
| 45 | |
| 46 | /** |
| 47 | * Computes diffs between sequences of strings. |
| 48 | * |
| 49 | * @param array|string &$from_content An array of strings. Typically these are lines from a file. |
| 50 | * @param array|string &$to_content An array of strings. |
| 51 | * @param bool $preserve_cr If true, \r is replaced by a new line in the diff output |
| 52 | */ |
| 53 | function __construct(&$from_content, &$to_content, $preserve_cr = true) |
| 54 | { |
| 55 | $diff_engine = new diff_engine(); |
| 56 | $this->_edits = $diff_engine->diff($from_content, $to_content, $preserve_cr); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Returns the array of differences. |
| 61 | */ |
| 62 | function get_diff() |
| 63 | { |
| 64 | return $this->_edits; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * returns the number of new (added) lines in a given diff. |
| 69 | * |
| 70 | * @since Text_Diff 1.1.0 |
| 71 | * |
| 72 | * @return integer The number of new lines |
| 73 | */ |
| 74 | function count_added_lines() |
| 75 | { |
| 76 | $count = 0; |
| 77 | |
| 78 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 79 | { |
| 80 | $edit = $this->_edits[$i]; |
| 81 | |
| 82 | if (is_a($edit, 'diff_op_add') || is_a($edit, 'diff_op_change')) |
| 83 | { |
| 84 | $count += $edit->nfinal(); |
| 85 | } |
| 86 | } |
| 87 | return $count; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Returns the number of deleted (removed) lines in a given diff. |
| 92 | * |
| 93 | * @since Text_Diff 1.1.0 |
| 94 | * |
| 95 | * @return integer The number of deleted lines |
| 96 | */ |
| 97 | function count_deleted_lines() |
| 98 | { |
| 99 | $count = 0; |
| 100 | |
| 101 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 102 | { |
| 103 | $edit = $this->_edits[$i]; |
| 104 | |
| 105 | if (is_a($edit, 'diff_op_delete') || is_a($edit, 'diff_op_change')) |
| 106 | { |
| 107 | $count += $edit->norig(); |
| 108 | } |
| 109 | } |
| 110 | return $count; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Computes a reversed diff. |
| 115 | * |
| 116 | * Example: |
| 117 | * <code> |
| 118 | * $diff = new diff($lines1, $lines2); |
| 119 | * $rev = $diff->reverse(); |
| 120 | * </code> |
| 121 | * |
| 122 | * @return diff A Diff object representing the inverse of the original diff. |
| 123 | * Note that we purposely don't return a reference here, since |
| 124 | * this essentially is a clone() method. |
| 125 | */ |
| 126 | function reverse() |
| 127 | { |
| 128 | if (version_compare(zend_version(), '2', '>')) |
| 129 | { |
| 130 | $rev = clone($this); |
| 131 | } |
| 132 | else |
| 133 | { |
| 134 | $rev = $this; |
| 135 | } |
| 136 | |
| 137 | $rev->_edits = array(); |
| 138 | |
| 139 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 140 | { |
| 141 | $edit = $this->_edits[$i]; |
| 142 | $rev->_edits[] = $edit->reverse(); |
| 143 | } |
| 144 | |
| 145 | return $rev; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Checks for an empty diff. |
| 150 | * |
| 151 | * @return boolean True if two sequences were identical. |
| 152 | */ |
| 153 | function is_empty() |
| 154 | { |
| 155 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 156 | { |
| 157 | $edit = $this->_edits[$i]; |
| 158 | |
| 159 | // skip diff_op_copy |
| 160 | if (is_a($edit, 'diff_op_copy')) |
| 161 | { |
| 162 | continue; |
| 163 | } |
| 164 | |
| 165 | if (is_a($edit, 'diff_op_delete') || is_a($edit, 'diff_op_add')) |
| 166 | { |
| 167 | $orig = $edit->orig; |
| 168 | $final = $edit->final; |
| 169 | |
| 170 | // We can simplify one case where the array is usually supposed to be empty... |
| 171 | if (is_array($orig) && count($orig) == 1 && trim($orig[0]) === '') |
| 172 | { |
| 173 | $orig = array(); |
| 174 | } |
| 175 | if (is_array($final) && count($final) == 1 && trim($final[0]) === '') |
| 176 | { |
| 177 | $final = array(); |
| 178 | } |
| 179 | |
| 180 | if (!$orig && !$final) |
| 181 | { |
| 182 | continue; |
| 183 | } |
| 184 | |
| 185 | return false; |
| 186 | } |
| 187 | |
| 188 | return false; |
| 189 | } |
| 190 | |
| 191 | return true; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Computes the length of the Longest Common Subsequence (LCS). |
| 196 | * |
| 197 | * This is mostly for diagnostic purposes. |
| 198 | * |
| 199 | * @return integer The length of the LCS. |
| 200 | */ |
| 201 | function lcs() |
| 202 | { |
| 203 | $lcs = 0; |
| 204 | |
| 205 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 206 | { |
| 207 | $edit = $this->_edits[$i]; |
| 208 | |
| 209 | if (is_a($edit, 'diff_op_copy')) |
| 210 | { |
| 211 | $lcs += count($edit->orig); |
| 212 | } |
| 213 | } |
| 214 | return $lcs; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Gets the original set of lines. |
| 219 | * |
| 220 | * This reconstructs the $from_lines parameter passed to the constructor. |
| 221 | * |
| 222 | * @return array The original sequence of strings. |
| 223 | */ |
| 224 | function get_original() |
| 225 | { |
| 226 | $lines = array(); |
| 227 | |
| 228 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 229 | { |
| 230 | $edit = $this->_edits[$i]; |
| 231 | |
| 232 | if ($edit->orig) |
| 233 | { |
| 234 | array_splice($lines, count($lines), 0, $edit->orig); |
| 235 | } |
| 236 | } |
| 237 | return $lines; |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Gets the final set of lines. |
| 242 | * |
| 243 | * This reconstructs the $to_lines parameter passed to the constructor. |
| 244 | * |
| 245 | * @return array The sequence of strings. |
| 246 | */ |
| 247 | function get_final() |
| 248 | { |
| 249 | $lines = array(); |
| 250 | |
| 251 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 252 | { |
| 253 | $edit = $this->_edits[$i]; |
| 254 | |
| 255 | if ($edit->final) |
| 256 | { |
| 257 | array_splice($lines, count($lines), 0, $edit->final); |
| 258 | } |
| 259 | } |
| 260 | return $lines; |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Removes trailing newlines from a line of text. This is meant to be used with array_walk(). |
| 265 | * |
| 266 | * @param string &$line The line to trim. |
| 267 | * @param integer $key The index of the line in the array. Not used. |
| 268 | */ |
| 269 | function trim_newlines(&$line, $key) |
| 270 | { |
| 271 | $line = str_replace(array("\n", "\r"), '', $line); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Checks a diff for validity. |
| 276 | * |
| 277 | * This is here only for debugging purposes. |
| 278 | */ |
| 279 | function _check($from_lines, $to_lines) |
| 280 | { |
| 281 | if (serialize($from_lines) != serialize($this->get_original())) |
| 282 | { |
| 283 | trigger_error("[diff] Reconstructed original doesn't match", E_USER_ERROR); |
| 284 | } |
| 285 | |
| 286 | if (serialize($to_lines) != serialize($this->get_final())) |
| 287 | { |
| 288 | trigger_error("[diff] Reconstructed final doesn't match", E_USER_ERROR); |
| 289 | } |
| 290 | |
| 291 | $rev = $this->reverse(); |
| 292 | |
| 293 | if (serialize($to_lines) != serialize($rev->get_original())) |
| 294 | { |
| 295 | trigger_error("[diff] Reversed original doesn't match", E_USER_ERROR); |
| 296 | } |
| 297 | |
| 298 | if (serialize($from_lines) != serialize($rev->get_final())) |
| 299 | { |
| 300 | trigger_error("[diff] Reversed final doesn't match", E_USER_ERROR); |
| 301 | } |
| 302 | |
| 303 | $prevtype = null; |
| 304 | |
| 305 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 306 | { |
| 307 | $edit = $this->_edits[$i]; |
| 308 | |
| 309 | if ($prevtype == get_class($edit)) |
| 310 | { |
| 311 | trigger_error("[diff] Edit sequence is non-optimal", E_USER_ERROR); |
| 312 | } |
| 313 | $prevtype = get_class($edit); |
| 314 | } |
| 315 | |
| 316 | return true; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * @package diff |
| 322 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 323 | */ |
| 324 | class mapped_diff extends diff |
| 325 | { |
| 326 | /** |
| 327 | * Computes a diff between sequences of strings. |
| 328 | * |
| 329 | * This can be used to compute things like case-insensitve diffs, or diffs |
| 330 | * which ignore changes in white-space. |
| 331 | * |
| 332 | * @param array $from_lines An array of strings. |
| 333 | * @param array $to_lines An array of strings. |
| 334 | * @param array $mapped_from_lines This array should have the same size number of elements as $from_lines. |
| 335 | * The elements in $mapped_from_lines and $mapped_to_lines are what is actually |
| 336 | * compared when computing the diff. |
| 337 | * @param array $mapped_to_lines This array should have the same number of elements as $to_lines. |
| 338 | */ |
| 339 | function __construct(&$from_lines, &$to_lines, &$mapped_from_lines, &$mapped_to_lines) |
| 340 | { |
| 341 | if (count($from_lines) != count($mapped_from_lines) || count($to_lines) != count($mapped_to_lines)) |
| 342 | { |
| 343 | return; |
| 344 | } |
| 345 | |
| 346 | parent::__construct($mapped_from_lines, $mapped_to_lines); |
| 347 | |
| 348 | $xi = $yi = 0; |
| 349 | for ($i = 0; $i < count($this->_edits); $i++) |
| 350 | { |
| 351 | $orig = &$this->_edits[$i]->orig; |
| 352 | if (is_array($orig)) |
| 353 | { |
| 354 | $orig = array_slice($from_lines, $xi, count($orig)); |
| 355 | $xi += count($orig); |
| 356 | } |
| 357 | |
| 358 | $final = &$this->_edits[$i]->final; |
| 359 | if (is_array($final)) |
| 360 | { |
| 361 | $final = array_slice($to_lines, $yi, count($final)); |
| 362 | $yi += count($final); |
| 363 | } |
| 364 | } |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * @package diff |
| 370 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 371 | * |
| 372 | * @access private |
| 373 | */ |
| 374 | class diff_op |
| 375 | { |
| 376 | var $orig; |
| 377 | var $final; |
| 378 | |
| 379 | function &reverse() |
| 380 | { |
| 381 | trigger_error('[diff] Abstract method', E_USER_ERROR); |
| 382 | } |
| 383 | |
| 384 | function norig() |
| 385 | { |
| 386 | return ($this->orig) ? count($this->orig) : 0; |
| 387 | } |
| 388 | |
| 389 | function nfinal() |
| 390 | { |
| 391 | return ($this->final) ? count($this->final) : 0; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * @package diff |
| 397 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 398 | * |
| 399 | * @access private |
| 400 | */ |
| 401 | class diff_op_copy extends diff_op |
| 402 | { |
| 403 | function __construct($orig, $final = false) |
| 404 | { |
| 405 | if (!is_array($final)) |
| 406 | { |
| 407 | $final = $orig; |
| 408 | } |
| 409 | $this->orig = $orig; |
| 410 | $this->final = $final; |
| 411 | } |
| 412 | |
| 413 | function &reverse() |
| 414 | { |
| 415 | $reverse = new diff_op_copy($this->final, $this->orig); |
| 416 | return $reverse; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * @package diff |
| 422 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 423 | * |
| 424 | * @access private |
| 425 | */ |
| 426 | class diff_op_delete extends diff_op |
| 427 | { |
| 428 | function __construct($lines) |
| 429 | { |
| 430 | $this->orig = $lines; |
| 431 | $this->final = false; |
| 432 | } |
| 433 | |
| 434 | function &reverse() |
| 435 | { |
| 436 | $reverse = new diff_op_add($this->orig); |
| 437 | return $reverse; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * @package diff |
| 443 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 444 | * |
| 445 | * @access private |
| 446 | */ |
| 447 | class diff_op_add extends diff_op |
| 448 | { |
| 449 | function __construct($lines) |
| 450 | { |
| 451 | $this->final = $lines; |
| 452 | $this->orig = false; |
| 453 | } |
| 454 | |
| 455 | function &reverse() |
| 456 | { |
| 457 | $reverse = new diff_op_delete($this->final); |
| 458 | return $reverse; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | /** |
| 463 | * @package diff |
| 464 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 465 | * |
| 466 | * @access private |
| 467 | */ |
| 468 | class diff_op_change extends diff_op |
| 469 | { |
| 470 | function __construct($orig, $final) |
| 471 | { |
| 472 | $this->orig = $orig; |
| 473 | $this->final = $final; |
| 474 | } |
| 475 | |
| 476 | function &reverse() |
| 477 | { |
| 478 | $reverse = new diff_op_change($this->final, $this->orig); |
| 479 | return $reverse; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | |
| 484 | /** |
| 485 | * A class for computing three way diffs. |
| 486 | * |
| 487 | * @package diff |
| 488 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 489 | */ |
| 490 | class diff3 extends diff |
| 491 | { |
| 492 | /** |
| 493 | * Conflict counter. |
| 494 | * @var integer |
| 495 | */ |
| 496 | var $_conflicting_blocks = 0; |
| 497 | |
| 498 | /** |
| 499 | * Computes diff between 3 sequences of strings. |
| 500 | * |
| 501 | * @param array|string &$orig The original lines to use. |
| 502 | * @param array|string &$final1 The first version to compare to. |
| 503 | * @param array|string &$final2 The second version to compare to. |
| 504 | * @param bool $preserve_cr If true, \r\n and bare \r are replaced by a new line |
| 505 | * in the diff output |
| 506 | */ |
| 507 | function __construct(&$orig, &$final1, &$final2, $preserve_cr = true) |
| 508 | { |
| 509 | $diff_engine = new diff_engine(); |
| 510 | |
| 511 | $diff_1 = $diff_engine->diff($orig, $final1, $preserve_cr); |
| 512 | $diff_2 = $diff_engine->diff($orig, $final2, $preserve_cr); |
| 513 | |
| 514 | unset($diff_engine); |
| 515 | |
| 516 | $this->_edits = $this->_diff3($diff_1, $diff_2); |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * Return number of conflicts |
| 521 | */ |
| 522 | function get_num_conflicts() |
| 523 | { |
| 524 | $conflicts = 0; |
| 525 | |
| 526 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 527 | { |
| 528 | $edit = $this->_edits[$i]; |
| 529 | |
| 530 | if ($edit->is_conflict()) |
| 531 | { |
| 532 | $conflicts++; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | return $conflicts; |
| 537 | } |
| 538 | |
| 539 | /** |
| 540 | * Get conflicts content for download. This is generally a merged file, but preserving conflicts and adding explanations to it. |
| 541 | * A user could then go through this file, search for the conflicts and changes the code accordingly. |
| 542 | * |
| 543 | * @param string $label1 the cvs file version/label from the original set of lines |
| 544 | * @param string $label2 the cvs file version/label from the new set of lines |
| 545 | * @param string $label_sep the explanation between label1 and label2 - more of a helper for the user |
| 546 | * |
| 547 | * @return array the merged output |
| 548 | */ |
| 549 | function get_conflicts_content($label1 = 'CURRENT_FILE', $label2 = 'NEW_FILE', $label_sep = 'DIFF_SEP_EXPLAIN') |
| 550 | { |
| 551 | global $user; |
| 552 | |
| 553 | $label1 = (!empty($user->lang[$label1])) ? $user->lang[$label1] : $label1; |
| 554 | $label2 = (!empty($user->lang[$label2])) ? $user->lang[$label2] : $label2; |
| 555 | $label_sep = (!empty($user->lang[$label_sep])) ? $user->lang[$label_sep] : $label_sep; |
| 556 | |
| 557 | $lines = array(); |
| 558 | |
| 559 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 560 | { |
| 561 | $edit = $this->_edits[$i]; |
| 562 | |
| 563 | if ($edit->is_conflict()) |
| 564 | { |
| 565 | // Start conflict label |
| 566 | $label_start = array('<<<<<<< ' . $label1); |
| 567 | $label_mid = array('======= ' . $label_sep); |
| 568 | $label_end = array('>>>>>>> ' . $label2); |
| 569 | |
| 570 | $lines = array_merge($lines, $label_start, $edit->final1, $label_mid, $edit->final2, $label_end); |
| 571 | $this->_conflicting_blocks++; |
| 572 | } |
| 573 | else |
| 574 | { |
| 575 | $lines = array_merge($lines, $edit->merged()); |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | return $lines; |
| 580 | } |
| 581 | |
| 582 | /** |
| 583 | * Return merged output (used by the renderer) |
| 584 | * |
| 585 | * @return array the merged output |
| 586 | */ |
| 587 | function merged_output() |
| 588 | { |
| 589 | return $this->get_conflicts_content(); |
| 590 | } |
| 591 | |
| 592 | /** |
| 593 | * Merge the output and use the new file code for conflicts |
| 594 | */ |
| 595 | function merged_new_output() |
| 596 | { |
| 597 | $lines = array(); |
| 598 | |
| 599 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 600 | { |
| 601 | $edit = $this->_edits[$i]; |
| 602 | |
| 603 | if ($edit->is_conflict()) |
| 604 | { |
| 605 | $lines = array_merge($lines, $edit->final2); |
| 606 | } |
| 607 | else |
| 608 | { |
| 609 | $lines = array_merge($lines, $edit->merged()); |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | return $lines; |
| 614 | } |
| 615 | |
| 616 | /** |
| 617 | * Merge the output and use the original file code for conflicts |
| 618 | */ |
| 619 | function merged_orig_output() |
| 620 | { |
| 621 | $lines = array(); |
| 622 | |
| 623 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 624 | { |
| 625 | $edit = $this->_edits[$i]; |
| 626 | |
| 627 | if ($edit->is_conflict()) |
| 628 | { |
| 629 | $lines = array_merge($lines, $edit->final1); |
| 630 | } |
| 631 | else |
| 632 | { |
| 633 | $lines = array_merge($lines, $edit->merged()); |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | return $lines; |
| 638 | } |
| 639 | |
| 640 | /** |
| 641 | * Get conflicting block(s) |
| 642 | */ |
| 643 | function get_conflicts() |
| 644 | { |
| 645 | $conflicts = array(); |
| 646 | |
| 647 | for ($i = 0, $size = count($this->_edits); $i < $size; $i++) |
| 648 | { |
| 649 | $edit = $this->_edits[$i]; |
| 650 | |
| 651 | if ($edit->is_conflict()) |
| 652 | { |
| 653 | $conflicts[] = array($edit->final1, $edit->final2); |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | return $conflicts; |
| 658 | } |
| 659 | |
| 660 | /** |
| 661 | * @access private |
| 662 | */ |
| 663 | function _diff3(&$edits1, &$edits2) |
| 664 | { |
| 665 | $edits = array(); |
| 666 | $bb = new diff3_block_builder(); |
| 667 | |
| 668 | $e1 = current($edits1); |
| 669 | $e2 = current($edits2); |
| 670 | |
| 671 | while ($e1 || $e2) |
| 672 | { |
| 673 | if ($e1 && $e2 && is_a($e1, 'diff_op_copy') && is_a($e2, 'diff_op_copy')) |
| 674 | { |
| 675 | // We have copy blocks from both diffs. This is the (only) time we want to emit a diff3 copy block. |
| 676 | // Flush current diff3 diff block, if any. |
| 677 | if ($edit = $bb->finish()) |
| 678 | { |
| 679 | $edits[] = $edit; |
| 680 | } |
| 681 | |
| 682 | $ncopy = min($e1->norig(), $e2->norig()); |
| 683 | $edits[] = new diff3_op_copy(array_slice($e1->orig, 0, $ncopy)); |
| 684 | |
| 685 | if ($e1->norig() > $ncopy) |
| 686 | { |
| 687 | array_splice($e1->orig, 0, $ncopy); |
| 688 | array_splice($e1->final, 0, $ncopy); |
| 689 | } |
| 690 | else |
| 691 | { |
| 692 | $e1 = next($edits1); |
| 693 | } |
| 694 | |
| 695 | if ($e2->norig() > $ncopy) |
| 696 | { |
| 697 | array_splice($e2->orig, 0, $ncopy); |
| 698 | array_splice($e2->final, 0, $ncopy); |
| 699 | } |
| 700 | else |
| 701 | { |
| 702 | $e2 = next($edits2); |
| 703 | } |
| 704 | } |
| 705 | else |
| 706 | { |
| 707 | if ($e1 && $e2) |
| 708 | { |
| 709 | if ($e1->orig && $e2->orig) |
| 710 | { |
| 711 | $norig = min($e1->norig(), $e2->norig()); |
| 712 | $orig = array_splice($e1->orig, 0, $norig); |
| 713 | array_splice($e2->orig, 0, $norig); |
| 714 | $bb->input($orig); |
| 715 | } |
| 716 | else |
| 717 | { |
| 718 | $norig = 0; |
| 719 | } |
| 720 | |
| 721 | if (is_a($e1, 'diff_op_copy')) |
| 722 | { |
| 723 | $bb->out1(array_splice($e1->final, 0, $norig)); |
| 724 | } |
| 725 | |
| 726 | if (is_a($e2, 'diff_op_copy')) |
| 727 | { |
| 728 | $bb->out2(array_splice($e2->final, 0, $norig)); |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | if ($e1 && ! $e1->orig) |
| 733 | { |
| 734 | $bb->out1($e1->final); |
| 735 | $e1 = next($edits1); |
| 736 | } |
| 737 | |
| 738 | if ($e2 && ! $e2->orig) |
| 739 | { |
| 740 | $bb->out2($e2->final); |
| 741 | $e2 = next($edits2); |
| 742 | } |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | if ($edit = $bb->finish()) |
| 747 | { |
| 748 | $edits[] = $edit; |
| 749 | } |
| 750 | |
| 751 | return $edits; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | /** |
| 756 | * @package diff |
| 757 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 758 | * |
| 759 | * @access private |
| 760 | */ |
| 761 | class diff3_op |
| 762 | { |
| 763 | /** |
| 764 | * @var array|mixed |
| 765 | */ |
| 766 | protected $orig; |
| 767 | |
| 768 | /** |
| 769 | * @var array|mixed |
| 770 | */ |
| 771 | protected $final1; |
| 772 | |
| 773 | /** |
| 774 | * @var array|mixed |
| 775 | */ |
| 776 | protected $final2; |
| 777 | |
| 778 | /** |
| 779 | * @var false |
| 780 | */ |
| 781 | protected $_merged; |
| 782 | |
| 783 | function __construct($orig = false, $final1 = false, $final2 = false) |
| 784 | { |
| 785 | $this->orig = $orig ?: array(); |
| 786 | $this->final1 = $final1 ?: array(); |
| 787 | $this->final2 = $final2 ?: array(); |
| 788 | } |
| 789 | |
| 790 | function merged() |
| 791 | { |
| 792 | if (!isset($this->_merged)) |
| 793 | { |
| 794 | // Prepare the arrays before we compare them. ;) |
| 795 | $this->solve_prepare(); |
| 796 | |
| 797 | if ($this->final1 === $this->final2) |
| 798 | { |
| 799 | $this->_merged = &$this->final1; |
| 800 | } |
| 801 | else if ($this->final1 === $this->orig) |
| 802 | { |
| 803 | $this->_merged = &$this->final2; |
| 804 | } |
| 805 | else if ($this->final2 === $this->orig) |
| 806 | { |
| 807 | $this->_merged = &$this->final1; |
| 808 | } |
| 809 | else |
| 810 | { |
| 811 | // The following tries to aggressively solve conflicts... |
| 812 | $this->_merged = false; |
| 813 | $this->solve_conflict(); |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | return $this->_merged; |
| 818 | } |
| 819 | |
| 820 | function is_conflict() |
| 821 | { |
| 822 | return ($this->merged() === false) ? true : false; |
| 823 | } |
| 824 | |
| 825 | /** |
| 826 | * Function to prepare the arrays for comparing - we want to skip over newline changes |
| 827 | * @author acydburn |
| 828 | */ |
| 829 | function solve_prepare() |
| 830 | { |
| 831 | // We can simplify one case where the array is usually supposed to be empty... |
| 832 | if (count($this->orig) == 1 && trim($this->orig[0]) === '') $this->orig = array(); |
| 833 | if (count($this->final1) == 1 && trim($this->final1[0]) === '') $this->final1 = array(); |
| 834 | if (count($this->final2) == 1 && trim($this->final2[0]) === '') $this->final2 = array(); |
| 835 | |
| 836 | // Now we only can have the case where the only difference between arrays are newlines, so compare all cases |
| 837 | |
| 838 | // First, some strings we can compare... |
| 839 | $orig = $final1 = $final2 = ''; |
| 840 | |
| 841 | foreach ($this->orig as $null => $line) $orig .= trim($line); |
| 842 | foreach ($this->final1 as $null => $line) $final1 .= trim($line); |
| 843 | foreach ($this->final2 as $null => $line) $final2 .= trim($line); |
| 844 | |
| 845 | // final1 === final2 |
| 846 | if ($final1 === $final2) |
| 847 | { |
| 848 | // We preserve the part which will be used in the merge later |
| 849 | $this->final2 = $this->final1; |
| 850 | } |
| 851 | // final1 === orig |
| 852 | else if ($final1 === $orig) |
| 853 | { |
| 854 | // Here it does not really matter what we choose, but we will use the new code |
| 855 | $this->orig = $this->final1; |
| 856 | } |
| 857 | // final2 === orig |
| 858 | else if ($final2 === $orig) |
| 859 | { |
| 860 | // Here it does not really matter too (final1 will be used), but we will use the new code |
| 861 | $this->orig = $this->final2; |
| 862 | } |
| 863 | } |
| 864 | |
| 865 | /** |
| 866 | * Find code portions from $orig in $final1 and use $final2 as merged instance if provided |
| 867 | * @author acydburn |
| 868 | */ |
| 869 | function _compare_conflict_seq($orig, $final1, $final2 = false) |
| 870 | { |
| 871 | $result = array('merge_found' => false, 'merge' => array()); |
| 872 | |
| 873 | $_orig = &$this->$orig; |
| 874 | $_final1 = &$this->$final1; |
| 875 | |
| 876 | // Ok, we basically search for $orig in $final1 |
| 877 | $compare_seq = count($_orig); |
| 878 | |
| 879 | // Go through the conflict code |
| 880 | for ($i = 0, $j = 0, $size = count($_final1); $i < $size; $i++, $j = $i) |
| 881 | { |
| 882 | $line = $_final1[$i]; |
| 883 | $skip = 0; |
| 884 | |
| 885 | for ($x = 0; $x < $compare_seq; $x++) |
| 886 | { |
| 887 | // Try to skip all matching lines |
| 888 | if (trim($line) === trim($_orig[$x])) |
| 889 | { |
| 890 | $line = (++$j < $size) ? $_final1[$j] : $line; |
| 891 | $skip++; |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | if ($skip === $compare_seq) |
| 896 | { |
| 897 | $result['merge_found'] = true; |
| 898 | |
| 899 | if ($final2 !== false) |
| 900 | { |
| 901 | $result['merge'] = array_merge($result['merge'], $this->$final2); |
| 902 | } |
| 903 | $i += ($skip - 1); |
| 904 | } |
| 905 | else if ($final2 !== false) |
| 906 | { |
| 907 | $result['merge'][] = $line; |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | return $result; |
| 912 | } |
| 913 | |
| 914 | /** |
| 915 | * Tries to solve conflicts aggressively based on typical "assumptions" |
| 916 | * @author acydburn |
| 917 | */ |
| 918 | function solve_conflict() |
| 919 | { |
| 920 | $this->_merged = false; |
| 921 | |
| 922 | // CASE ONE: orig changed into final2, but modified/unknown code in final1. |
| 923 | // IF orig is found "as is" in final1 we replace the code directly in final1 and populate this as final2/merge |
| 924 | if (count($this->orig) && count($this->final2)) |
| 925 | { |
| 926 | $result = $this->_compare_conflict_seq('orig', 'final1', 'final2'); |
| 927 | |
| 928 | if ($result['merge_found']) |
| 929 | { |
| 930 | $this->final2 = $result['merge']; |
| 931 | $this->_merged = &$this->final2; |
| 932 | return; |
| 933 | } |
| 934 | |
| 935 | $result = $this->_compare_conflict_seq('final2', 'final1'); |
| 936 | |
| 937 | if ($result['merge_found']) |
| 938 | { |
| 939 | $this->_merged = &$this->final1; |
| 940 | return; |
| 941 | } |
| 942 | |
| 943 | // Try to solve $Id$ issues. ;) |
| 944 | if (count($this->orig) == 1 && count($this->final1) == 1 && count($this->final2) == 1) |
| 945 | { |
| 946 | $match = '#^' . preg_quote('* @version $Id: ', '#') . '[a-z\._\- ]+[0-9]+ [0-9]{4}-[0-9]{2}-[0-9]{2} [0-9\:Z]+ [a-z0-9_\- ]+\$$#'; |
| 947 | |
| 948 | if (preg_match($match, $this->orig[0]) && preg_match($match, $this->final1[0]) && preg_match($match, $this->final2[0])) |
| 949 | { |
| 950 | $this->_merged = &$this->final2; |
| 951 | return; |
| 952 | } |
| 953 | } |
| 954 | |
| 955 | $second_run = false; |
| 956 | |
| 957 | // Try to solve issues where the only reason why the above did not work is a newline being removed in the final1 code but exist in the orig/final2 code |
| 958 | if (trim($this->orig[0]) === '' && trim($this->final2[0]) === '') |
| 959 | { |
| 960 | unset($this->orig[0], $this->final2[0]); |
| 961 | $this->orig = array_values($this->orig); |
| 962 | $this->final2 = array_values($this->final2); |
| 963 | |
| 964 | $second_run = true; |
| 965 | } |
| 966 | |
| 967 | // The same is true for a line at the end. ;) |
| 968 | if (count($this->orig) && count($this->final2) && count($this->orig) === count($this->final2) && trim($this->orig[count($this->orig)-1]) === '' && trim($this->final2[count($this->final2)-1]) === '') |
| 969 | { |
| 970 | unset($this->orig[count($this->orig)-1], $this->final2[count($this->final2)-1]); |
| 971 | $this->orig = array_values($this->orig); |
| 972 | $this->final2 = array_values($this->final2); |
| 973 | |
| 974 | $second_run = true; |
| 975 | } |
| 976 | |
| 977 | if ($second_run) |
| 978 | { |
| 979 | $result = $this->_compare_conflict_seq('orig', 'final1', 'final2'); |
| 980 | |
| 981 | if ($result['merge_found']) |
| 982 | { |
| 983 | $this->final2 = $result['merge']; |
| 984 | $this->_merged = &$this->final2; |
| 985 | return; |
| 986 | } |
| 987 | |
| 988 | $result = $this->_compare_conflict_seq('final2', 'final1'); |
| 989 | |
| 990 | if ($result['merge_found']) |
| 991 | { |
| 992 | $this->_merged = &$this->final1; |
| 993 | return; |
| 994 | } |
| 995 | } |
| 996 | |
| 997 | return; |
| 998 | } |
| 999 | |
| 1000 | // CASE TWO: Added lines from orig to final2 but final1 had added lines too. Just merge them. |
| 1001 | if (!count($this->orig) && $this->final1 !== $this->final2 && count($this->final1) && count($this->final2)) |
| 1002 | { |
| 1003 | $result = $this->_compare_conflict_seq('final2', 'final1'); |
| 1004 | |
| 1005 | if ($result['merge_found']) |
| 1006 | { |
| 1007 | $this->final2 = $this->final1; |
| 1008 | $this->_merged = &$this->final1; |
| 1009 | } |
| 1010 | else |
| 1011 | { |
| 1012 | $result = $this->_compare_conflict_seq('final1', 'final2'); |
| 1013 | |
| 1014 | if (!$result['merge_found']) |
| 1015 | { |
| 1016 | $this->final2 = array_merge($this->final1, $this->final2); |
| 1017 | $this->_merged = &$this->final2; |
| 1018 | } |
| 1019 | else |
| 1020 | { |
| 1021 | $this->final2 = $this->final1; |
| 1022 | $this->_merged = &$this->final1; |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | return; |
| 1027 | } |
| 1028 | |
| 1029 | // CASE THREE: Removed lines (orig has the to-remove line(s), but final1 has additional lines which does not need to be removed). Just remove orig from final1 and then use final1 as final2/merge |
| 1030 | if (!count($this->final2) && count($this->orig) && count($this->final1) && $this->orig !== $this->final1) |
| 1031 | { |
| 1032 | $result = $this->_compare_conflict_seq('orig', 'final1'); |
| 1033 | |
| 1034 | if (!$result['merge_found']) |
| 1035 | { |
| 1036 | return; |
| 1037 | } |
| 1038 | |
| 1039 | // First of all, try to find the code in orig in final1. ;) |
| 1040 | $compare_seq = count($this->orig); |
| 1041 | $begin = $end = -1; |
| 1042 | $j = 0; |
| 1043 | |
| 1044 | for ($i = 0, $size = count($this->final1); $i < $size; $i++) |
| 1045 | { |
| 1046 | $line = $this->final1[$i]; |
| 1047 | |
| 1048 | if (trim($line) === trim($this->orig[$j])) |
| 1049 | { |
| 1050 | // Mark begin |
| 1051 | if ($begin === -1) |
| 1052 | { |
| 1053 | $begin = $i; |
| 1054 | } |
| 1055 | |
| 1056 | // End is always $i, the last found line |
| 1057 | $end = $i; |
| 1058 | |
| 1059 | if (isset($this->orig[$j+1])) |
| 1060 | { |
| 1061 | $j++; |
| 1062 | } |
| 1063 | } |
| 1064 | } |
| 1065 | |
| 1066 | if ($begin !== -1 && $begin + ($compare_seq - 1) == $end) |
| 1067 | { |
| 1068 | foreach ($this->final1 as $i => $line) |
| 1069 | { |
| 1070 | if ($i < $begin || $i > $end) |
| 1071 | { |
| 1072 | $merged[] = $line; |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | $this->final2 = $merged; |
| 1077 | $this->_merged = &$this->final2; |
| 1078 | } |
| 1079 | |
| 1080 | return; |
| 1081 | } |
| 1082 | } |
| 1083 | } |
| 1084 | |
| 1085 | /** |
| 1086 | * @package diff |
| 1087 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 1088 | * |
| 1089 | * @access private |
| 1090 | */ |
| 1091 | class diff3_op_copy extends diff3_op |
| 1092 | { |
| 1093 | function __construct($lines = false) |
| 1094 | { |
| 1095 | $this->orig = $lines ?: array(); |
| 1096 | $this->final1 = &$this->orig; |
| 1097 | $this->final2 = &$this->orig; |
| 1098 | } |
| 1099 | |
| 1100 | function merged() |
| 1101 | { |
| 1102 | return $this->orig; |
| 1103 | } |
| 1104 | |
| 1105 | function is_conflict() |
| 1106 | { |
| 1107 | return false; |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | /** |
| 1112 | * @package diff |
| 1113 | * @author Geoffrey T. Dairiki <dairiki@dairiki.org> |
| 1114 | * |
| 1115 | * @access private |
| 1116 | */ |
| 1117 | class diff3_block_builder |
| 1118 | { |
| 1119 | /** |
| 1120 | * @var array |
| 1121 | */ |
| 1122 | protected $orig; |
| 1123 | |
| 1124 | /** |
| 1125 | * @var array |
| 1126 | */ |
| 1127 | protected $final1; |
| 1128 | |
| 1129 | /** |
| 1130 | * @var array |
| 1131 | */ |
| 1132 | protected $final2; |
| 1133 | |
| 1134 | function __construct() |
| 1135 | { |
| 1136 | $this->_init(); |
| 1137 | } |
| 1138 | |
| 1139 | function input($lines) |
| 1140 | { |
| 1141 | if ($lines) |
| 1142 | { |
| 1143 | $this->_append($this->orig, $lines); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | function out1($lines) |
| 1148 | { |
| 1149 | if ($lines) |
| 1150 | { |
| 1151 | $this->_append($this->final1, $lines); |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | function out2($lines) |
| 1156 | { |
| 1157 | if ($lines) |
| 1158 | { |
| 1159 | $this->_append($this->final2, $lines); |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | function is_empty() |
| 1164 | { |
| 1165 | return !$this->orig && !$this->final1 && !$this->final2; |
| 1166 | } |
| 1167 | |
| 1168 | function finish() |
| 1169 | { |
| 1170 | if ($this->is_empty()) |
| 1171 | { |
| 1172 | return false; |
| 1173 | } |
| 1174 | else |
| 1175 | { |
| 1176 | $edit = new diff3_op($this->orig, $this->final1, $this->final2); |
| 1177 | $this->_init(); |
| 1178 | return $edit; |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | function _init() |
| 1183 | { |
| 1184 | $this->orig = $this->final1 = $this->final2 = array(); |
| 1185 | } |
| 1186 | |
| 1187 | function _append(&$array, $lines) |
| 1188 | { |
| 1189 | array_splice($array, count($array), 0, $lines); |
| 1190 | } |
| 1191 | } |