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1 <?php 2 /** 3 * Diff API: WP_Text_Diff_Renderer_Table class 4 * 5 * @package WordPress 6 * @subpackage Diff 7 * @since 4.7.0 8 */ 9 10 /** 11 * Table renderer to display the diff lines. 12 * 13 * @since 2.6.0 14 * @uses Text_Diff_Renderer Extends 15 */ 16 #[AllowDynamicProperties] 17 class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer { 18 19 /** 20 * @see Text_Diff_Renderer::_leading_context_lines 21 * @var int 22 * @since 2.6.0 23 */ 24 public $_leading_context_lines = 10000; 25 26 /** 27 * @see Text_Diff_Renderer::_trailing_context_lines 28 * @var int 29 * @since 2.6.0 30 */ 31 public $_trailing_context_lines = 10000; 32 33 /** 34 * Title of the item being compared. 35 * 36 * @since 6.4.0 Declared a previously dynamic property. 37 * @var string|null 38 */ 39 public $_title; 40 41 /** 42 * Title for the left column. 43 * 44 * @since 6.4.0 Declared a previously dynamic property. 45 * @var string|null 46 */ 47 public $_title_left; 48 49 /** 50 * Title for the right column. 51 * 52 * @since 6.4.0 Declared a previously dynamic property. 53 * @var string|null 54 */ 55 public $_title_right; 56 57 /** 58 * Threshold for when a diff should be saved or omitted. 59 * 60 * @var float 61 * @since 2.6.0 62 */ 63 protected $_diff_threshold = 0.6; 64 65 /** 66 * Inline display helper object name. 67 * 68 * @var string 69 * @since 2.6.0 70 */ 71 protected $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline'; 72 73 /** 74 * Should we show the split view or not 75 * 76 * @var string 77 * @since 3.6.0 78 */ 79 protected $_show_split_view = true; 80 81 protected $compat_fields = array( '_show_split_view', 'inline_diff_renderer', '_diff_threshold' ); 82 83 /** 84 * Caches the output of count_chars() in compute_string_distance() 85 * 86 * @var array 87 * @since 5.0.0 88 */ 89 protected $count_cache = array(); 90 91 /** 92 * Caches the difference calculation in compute_string_distance() 93 * 94 * @var array 95 * @since 5.0.0 96 */ 97 protected $difference_cache = array(); 98 99 /** 100 * Constructor - Call parent constructor with params array. 101 * 102 * This will set class properties based on the key value pairs in the array. 103 * 104 * @since 2.6.0 105 * 106 * @param array $params 107 */ 108 public function __construct( $params = array() ) { 109 parent::__construct( $params ); 110 if ( isset( $params['show_split_view'] ) ) { 111 $this->_show_split_view = $params['show_split_view']; 112 } 113 } 114 115 /** 116 * @ignore 117 * 118 * @param string $header 119 * @return string 120 */ 121 public function _startBlock( $header ) { 122 return ''; 123 } 124 125 /** 126 * @ignore 127 * 128 * @param array $lines 129 * @param string $prefix 130 */ 131 public function _lines( $lines, $prefix = ' ' ) { 132 } 133 134 /** 135 * @ignore 136 * 137 * @param string $line HTML-escape the value. 138 * @return string 139 */ 140 public function addedLine( $line ) { 141 return "<td class='diff-addedline'><span aria-hidden='true' class='dashicons dashicons-plus'></span><span class='screen-reader-text'>" . 142 /* translators: Hidden accessibility text. */ 143 __( 'Added:' ) . 144 " </span>{$line}</td>"; 145 } 146 147 /** 148 * @ignore 149 * 150 * @param string $line HTML-escape the value. 151 * @return string 152 */ 153 public function deletedLine( $line ) { 154 return "<td class='diff-deletedline'><span aria-hidden='true' class='dashicons dashicons-minus'></span><span class='screen-reader-text'>" . 155 /* translators: Hidden accessibility text. */ 156 __( 'Deleted:' ) . 157 " </span>{$line}</td>"; 158 } 159 160 /** 161 * @ignore 162 * 163 * @param string $line HTML-escape the value. 164 * @return string 165 */ 166 public function contextLine( $line ) { 167 return "<td class='diff-context'><span class='screen-reader-text'>" . 168 /* translators: Hidden accessibility text. */ 169 __( 'Unchanged:' ) . 170 " </span>{$line}</td>"; 171 } 172 173 /** 174 * @ignore 175 * 176 * @return string 177 */ 178 public function emptyLine() { 179 return '<td> </td>'; 180 } 181 182 /** 183 * @ignore 184 * 185 * @param array $lines 186 * @param bool $encode 187 * @return string 188 */ 189 public function _added( $lines, $encode = true ) { 190 $r = ''; 191 foreach ( $lines as $line ) { 192 if ( $encode ) { 193 $processed_line = htmlspecialchars( $line ); 194 195 /** 196 * Contextually filters a diffed line. 197 * 198 * Filters TextDiff processing of diffed line. By default, diffs are processed with 199 * htmlspecialchars. Use this filter to remove or change the processing. Passes a context 200 * indicating if the line is added, deleted or unchanged. 201 * 202 * @since 4.1.0 203 * 204 * @param string $processed_line The processed diffed line. 205 * @param string $line The unprocessed diffed line. 206 * @param string $context The line context. Values are 'added', 'deleted' or 'unchanged'. 207 */ 208 $line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'added' ); 209 } 210 211 if ( $this->_show_split_view ) { 212 $r .= '<tr>' . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n"; 213 } else { 214 $r .= '<tr>' . $this->addedLine( $line ) . "</tr>\n"; 215 } 216 } 217 return $r; 218 } 219 220 /** 221 * @ignore 222 * 223 * @param array $lines 224 * @param bool $encode 225 * @return string 226 */ 227 public function _deleted( $lines, $encode = true ) { 228 $r = ''; 229 foreach ( $lines as $line ) { 230 if ( $encode ) { 231 $processed_line = htmlspecialchars( $line ); 232 233 /** This filter is documented in wp-includes/wp-diff.php */ 234 $line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'deleted' ); 235 } 236 if ( $this->_show_split_view ) { 237 $r .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . "</tr>\n"; 238 } else { 239 $r .= '<tr>' . $this->deletedLine( $line ) . "</tr>\n"; 240 } 241 } 242 return $r; 243 } 244 245 /** 246 * @ignore 247 * 248 * @param array $lines 249 * @param bool $encode 250 * @return string 251 */ 252 public function _context( $lines, $encode = true ) { 253 $r = ''; 254 foreach ( $lines as $line ) { 255 if ( $encode ) { 256 $processed_line = htmlspecialchars( $line ); 257 258 /** This filter is documented in wp-includes/wp-diff.php */ 259 $line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'unchanged' ); 260 } 261 if ( $this->_show_split_view ) { 262 $r .= '<tr>' . $this->contextLine( $line ) . $this->contextLine( $line ) . "</tr>\n"; 263 } else { 264 $r .= '<tr>' . $this->contextLine( $line ) . "</tr>\n"; 265 } 266 } 267 return $r; 268 } 269 270 /** 271 * Process changed lines to do word-by-word diffs for extra highlighting. 272 * 273 * (TRAC style) sometimes these lines can actually be deleted or added rows. 274 * We do additional processing to figure that out 275 * 276 * @since 2.6.0 277 * 278 * @param array $orig 279 * @param array $final 280 * @return string 281 */ 282 public function _changed( $orig, $final ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.finalFound 283 $r = ''; 284 285 /* 286 * Does the aforementioned additional processing: 287 * *_matches tell what rows are "the same" in orig and final. Those pairs will be diffed to get word changes. 288 * - match is numeric: an index in other column. 289 * - match is 'X': no match. It is a new row. 290 * *_rows are column vectors for the orig column and the final column. 291 * - row >= 0: an index of the $orig or $final array. 292 * - row < 0: a blank row for that column. 293 */ 294 list($orig_matches, $final_matches, $orig_rows, $final_rows) = $this->interleave_changed_lines( $orig, $final ); 295 296 // These will hold the word changes as determined by an inline diff. 297 $orig_diffs = array(); 298 $final_diffs = array(); 299 300 // Compute word diffs for each matched pair using the inline diff. 301 foreach ( $orig_matches as $o => $f ) { 302 if ( is_numeric( $o ) && is_numeric( $f ) ) { 303 $text_diff = new Text_Diff( 'auto', array( array( $orig[ $o ] ), array( $final[ $f ] ) ) ); 304 $renderer = new $this->inline_diff_renderer(); 305 $diff = $renderer->render( $text_diff ); 306 307 // If they're too different, don't include any <ins> or <del>'s. 308 if ( preg_match_all( '!(<ins>.*?</ins>|<del>.*?</del>)!', $diff, $diff_matches ) ) { 309 // Length of all text between <ins> or <del>. 310 $stripped_matches = strlen( strip_tags( implode( ' ', $diff_matches[0] ) ) ); 311 /* 312 * Since we count length of text between <ins> or <del> (instead of picking just one), 313 * we double the length of chars not in those tags. 314 */ 315 $stripped_diff = strlen( strip_tags( $diff ) ) * 2 - $stripped_matches; 316 $diff_ratio = $stripped_matches / $stripped_diff; 317 if ( $diff_ratio > $this->_diff_threshold ) { 318 continue; // Too different. Don't save diffs. 319 } 320 } 321 322 // Un-inline the diffs by removing <del> or <ins>. 323 $orig_diffs[ $o ] = preg_replace( '|<ins>.*?</ins>|', '', $diff ); 324 $final_diffs[ $f ] = preg_replace( '|<del>.*?</del>|', '', $diff ); 325 } 326 } 327 328 foreach ( array_keys( $orig_rows ) as $row ) { 329 // Both columns have blanks. Ignore them. 330 if ( $orig_rows[ $row ] < 0 && $final_rows[ $row ] < 0 ) { 331 continue; 332 } 333 334 // If we have a word based diff, use it. Otherwise, use the normal line. 335 if ( isset( $orig_diffs[ $orig_rows[ $row ] ] ) ) { 336 $orig_line = $orig_diffs[ $orig_rows[ $row ] ]; 337 } elseif ( isset( $orig[ $orig_rows[ $row ] ] ) ) { 338 $orig_line = htmlspecialchars( $orig[ $orig_rows[ $row ] ] ); 339 } else { 340 $orig_line = ''; 341 } 342 343 if ( isset( $final_diffs[ $final_rows[ $row ] ] ) ) { 344 $final_line = $final_diffs[ $final_rows[ $row ] ]; 345 } elseif ( isset( $final[ $final_rows[ $row ] ] ) ) { 346 $final_line = htmlspecialchars( $final[ $final_rows[ $row ] ] ); 347 } else { 348 $final_line = ''; 349 } 350 351 if ( $orig_rows[ $row ] < 0 ) { // Orig is blank. This is really an added row. 352 $r .= $this->_added( array( $final_line ), false ); 353 } elseif ( $final_rows[ $row ] < 0 ) { // Final is blank. This is really a deleted row. 354 $r .= $this->_deleted( array( $orig_line ), false ); 355 } else { // A true changed row. 356 if ( $this->_show_split_view ) { 357 $r .= '<tr>' . $this->deletedLine( $orig_line ) . $this->addedLine( $final_line ) . "</tr>\n"; 358 } else { 359 $r .= '<tr>' . $this->deletedLine( $orig_line ) . '</tr><tr>' . $this->addedLine( $final_line ) . "</tr>\n"; 360 } 361 } 362 } 363 364 return $r; 365 } 366 367 /** 368 * Takes changed blocks and matches which rows in orig turned into which rows in final. 369 * 370 * @since 2.6.0 371 * 372 * @param array $orig Lines of the original version of the text. 373 * @param array $final Lines of the final version of the text. 374 * @return array { 375 * Array containing results of comparing the original text to the final text. 376 * 377 * @type array $orig_matches Associative array of original matches. Index == row 378 * number of `$orig`, value == corresponding row number 379 * of that same line in `$final` or 'x' if there is no 380 * corresponding row (indicating it is a deleted line). 381 * @type array $final_matches Associative array of final matches. Index == row 382 * number of `$final`, value == corresponding row number 383 * of that same line in `$orig` or 'x' if there is no 384 * corresponding row (indicating it is a new line). 385 * @type array $orig_rows Associative array of interleaved rows of `$orig` with 386 * blanks to keep matches aligned with side-by-side diff 387 * of `$final`. A value >= 0 corresponds to index of `$orig`. 388 * Value < 0 indicates a blank row. 389 * @type array $final_rows Associative array of interleaved rows of `$final` with 390 * blanks to keep matches aligned with side-by-side diff 391 * of `$orig`. A value >= 0 corresponds to index of `$final`. 392 * Value < 0 indicates a blank row. 393 * } 394 */ 395 public function interleave_changed_lines( $orig, $final ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.finalFound 396 397 // Contains all pairwise string comparisons. Keys are such that this need only be a one dimensional array. 398 $matches = array(); 399 foreach ( array_keys( $orig ) as $o ) { 400 foreach ( array_keys( $final ) as $f ) { 401 $matches[ "$o,$f" ] = $this->compute_string_distance( $orig[ $o ], $final[ $f ] ); 402 } 403 } 404 asort( $matches ); // Order by string distance. 405 406 $orig_matches = array(); 407 $final_matches = array(); 408 409 foreach ( $matches as $keys => $difference ) { 410 list($o, $f) = explode( ',', $keys ); 411 $o = (int) $o; 412 $f = (int) $f; 413 414 // Already have better matches for these guys. 415 if ( isset( $orig_matches[ $o ] ) && isset( $final_matches[ $f ] ) ) { 416 continue; 417 } 418 419 // First match for these guys. Must be best match. 420 if ( ! isset( $orig_matches[ $o ] ) && ! isset( $final_matches[ $f ] ) ) { 421 $orig_matches[ $o ] = $f; 422 $final_matches[ $f ] = $o; 423 continue; 424 } 425 426 // Best match of this final is already taken? Must mean this final is a new row. 427 if ( isset( $orig_matches[ $o ] ) ) { 428 $final_matches[ $f ] = 'x'; 429 } elseif ( isset( $final_matches[ $f ] ) ) { 430 // Best match of this orig is already taken? Must mean this orig is a deleted row. 431 $orig_matches[ $o ] = 'x'; 432 } 433 } 434 435 // We read the text in this order. 436 ksort( $orig_matches ); 437 ksort( $final_matches ); 438 439 // Stores rows and blanks for each column. 440 $orig_rows = array_keys( $orig_matches ); 441 $orig_rows_copy = $orig_rows; 442 $final_rows = array_keys( $final_matches ); 443 444 /* 445 * Interleaves rows with blanks to keep matches aligned. 446 * We may end up with some extraneous blank rows, but we'll just ignore them later. 447 */ 448 foreach ( $orig_rows_copy as $orig_row ) { 449 $final_pos = array_search( $orig_matches[ $orig_row ], $final_rows, true ); 450 $orig_pos = (int) array_search( $orig_row, $orig_rows, true ); 451 452 if ( false === $final_pos ) { // This orig is paired with a blank final. 453 array_splice( $final_rows, $orig_pos, 0, -1 ); 454 } elseif ( $final_pos < $orig_pos ) { // This orig's match is up a ways. Pad final with blank rows. 455 $diff_array = range( -1, $final_pos - $orig_pos ); 456 array_splice( $final_rows, $orig_pos, 0, $diff_array ); 457 } elseif ( $final_pos > $orig_pos ) { // This orig's match is down a ways. Pad orig with blank rows. 458 $diff_array = range( -1, $orig_pos - $final_pos ); 459 array_splice( $orig_rows, $orig_pos, 0, $diff_array ); 460 } 461 } 462 463 // Pad the ends with blank rows if the columns aren't the same length. 464 $diff_count = count( $orig_rows ) - count( $final_rows ); 465 if ( $diff_count < 0 ) { 466 while ( $diff_count < 0 ) { 467 array_push( $orig_rows, $diff_count++ ); 468 } 469 } elseif ( $diff_count > 0 ) { 470 $diff_count = -1 * $diff_count; 471 while ( $diff_count < 0 ) { 472 array_push( $final_rows, $diff_count++ ); 473 } 474 } 475 476 return array( $orig_matches, $final_matches, $orig_rows, $final_rows ); 477 } 478 479 /** 480 * Computes a number that is intended to reflect the "distance" between two strings. 481 * 482 * @since 2.6.0 483 * 484 * @param string $string1 485 * @param string $string2 486 * @return int 487 */ 488 public function compute_string_distance( $string1, $string2 ) { 489 // Use an md5 hash of the strings for a count cache, as it's fast to generate, and collisions aren't a concern. 490 $count_key1 = md5( $string1 ); 491 $count_key2 = md5( $string2 ); 492 493 // Cache vectors containing character frequency for all chars in each string. 494 if ( ! isset( $this->count_cache[ $count_key1 ] ) ) { 495 $this->count_cache[ $count_key1 ] = count_chars( $string1 ); 496 } 497 if ( ! isset( $this->count_cache[ $count_key2 ] ) ) { 498 $this->count_cache[ $count_key2 ] = count_chars( $string2 ); 499 } 500 501 $chars1 = $this->count_cache[ $count_key1 ]; 502 $chars2 = $this->count_cache[ $count_key2 ]; 503 504 $difference_key = md5( implode( ',', $chars1 ) . ':' . implode( ',', $chars2 ) ); 505 if ( ! isset( $this->difference_cache[ $difference_key ] ) ) { 506 // L1-norm of difference vector. 507 $this->difference_cache[ $difference_key ] = array_sum( array_map( array( $this, 'difference' ), $chars1, $chars2 ) ); 508 } 509 510 $difference = $this->difference_cache[ $difference_key ]; 511 512 // $string1 has zero length? Odd. Give huge penalty by not dividing. 513 if ( ! $string1 ) { 514 return $difference; 515 } 516 517 // Return distance per character (of string1). 518 return $difference / strlen( $string1 ); 519 } 520 521 /** 522 * @ignore 523 * @since 2.6.0 524 * 525 * @param int $a 526 * @param int $b 527 * @return int 528 */ 529 public function difference( $a, $b ) { 530 return abs( $a - $b ); 531 } 532 533 /** 534 * Make private properties readable for backward compatibility. 535 * 536 * @since 4.0.0 537 * @since 6.4.0 Getting a dynamic property is deprecated. 538 * 539 * @param string $name Property to get. 540 * @return mixed A declared property's value, else null. 541 */ 542 public function __get( $name ) { 543 if ( in_array( $name, $this->compat_fields, true ) ) { 544 return $this->$name; 545 } 546 547 wp_trigger_error( 548 __METHOD__, 549 "The property `{$name}` is not declared. Getting a dynamic property is " . 550 'deprecated since version 6.4.0! Instead, declare the property on the class.', 551 E_USER_DEPRECATED 552 ); 553 return null; 554 } 555 556 /** 557 * Make private properties settable for backward compatibility. 558 * 559 * @since 4.0.0 560 * @since 6.4.0 Setting a dynamic property is deprecated. 561 * 562 * @param string $name Property to check if set. 563 * @param mixed $value Property value. 564 */ 565 public function __set( $name, $value ) { 566 if ( in_array( $name, $this->compat_fields, true ) ) { 567 $this->$name = $value; 568 return; 569 } 570 571 wp_trigger_error( 572 __METHOD__, 573 "The property `{$name}` is not declared. Setting a dynamic property is " . 574 'deprecated since version 6.4.0! Instead, declare the property on the class.', 575 E_USER_DEPRECATED 576 ); 577 } 578 579 /** 580 * Make private properties checkable for backward compatibility. 581 * 582 * @since 4.0.0 583 * @since 6.4.0 Checking a dynamic property is deprecated. 584 * 585 * @param string $name Property to check if set. 586 * @return bool Whether the property is set. 587 */ 588 public function __isset( $name ) { 589 if ( in_array( $name, $this->compat_fields, true ) ) { 590 return isset( $this->$name ); 591 } 592 593 wp_trigger_error( 594 __METHOD__, 595 "The property `{$name}` is not declared. Checking `isset()` on a dynamic property " . 596 'is deprecated since version 6.4.0! Instead, declare the property on the class.', 597 E_USER_DEPRECATED 598 ); 599 return false; 600 } 601 602 /** 603 * Make private properties un-settable for backward compatibility. 604 * 605 * @since 4.0.0 606 * @since 6.4.0 Unsetting a dynamic property is deprecated. 607 * 608 * @param string $name Property to unset. 609 */ 610 public function __unset( $name ) { 611 if ( in_array( $name, $this->compat_fields, true ) ) { 612 unset( $this->$name ); 613 return; 614 } 615 616 wp_trigger_error( 617 __METHOD__, 618 "A property `{$name}` is not declared. Unsetting a dynamic property is " . 619 'deprecated since version 6.4.0! Instead, declare the property on the class.', 620 E_USER_DEPRECATED 621 ); 622 } 623 }
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