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| 1 | <?php |
| 2 | declare( strict_types = 1 ); |
| 3 | |
| 4 | /** |
| 5 | * This file contains general utilities for: |
| 6 | * (a) querying token properties and token types |
| 7 | * (b) manipulating tokens, individually and as collections. |
| 8 | */ |
| 9 | |
| 10 | namespace Wikimedia\Parsoid\Utils; |
| 11 | |
| 12 | use Wikimedia\Assert\Assert; |
| 13 | use Wikimedia\Assert\UnreachableException; |
| 14 | use Wikimedia\Parsoid\Config\Env; |
| 15 | use Wikimedia\Parsoid\Core\DomSourceRange; |
| 16 | use Wikimedia\Parsoid\Tokens\CommentTk; |
| 17 | use Wikimedia\Parsoid\Tokens\EndTagTk; |
| 18 | use Wikimedia\Parsoid\Tokens\EOFTk; |
| 19 | use Wikimedia\Parsoid\Tokens\KV; |
| 20 | use Wikimedia\Parsoid\Tokens\KVSourceRange; |
| 21 | use Wikimedia\Parsoid\Tokens\NlTk; |
| 22 | use Wikimedia\Parsoid\Tokens\SelfclosingTagTk; |
| 23 | use Wikimedia\Parsoid\Tokens\SourceRange; |
| 24 | use Wikimedia\Parsoid\Tokens\TagTk; |
| 25 | use Wikimedia\Parsoid\Tokens\Token; |
| 26 | use Wikimedia\Parsoid\Wikitext\Consts; |
| 27 | |
| 28 | class TokenUtils { |
| 29 | public const SOL_TRANSPARENT_LINK_REGEX = |
| 30 | '/(?:^|\s)mw:PageProp\/(?:Category|redirect|Language)(?=$|\s)/D'; |
| 31 | |
| 32 | /** |
| 33 | * Gets a string type value for a token |
| 34 | * @param Token|string $token |
| 35 | * @return string |
| 36 | */ |
| 37 | public static function getTokenType( $token ): string { |
| 38 | return is_string( $token ) ? 'string' : $token->getType(); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * @param string $name |
| 43 | * @return bool |
| 44 | */ |
| 45 | public static function isWikitextBlockTag( string $name ): bool { |
| 46 | return isset( Consts::$wikitextBlockElems[$name] ); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * In the legacy parser, these block tags open block-tag scope |
| 51 | * See doBlockLevels in the PHP parser (includes/parser/Parser.php). |
| 52 | * |
| 53 | * @param string $name |
| 54 | * @return bool |
| 55 | */ |
| 56 | public static function tagOpensBlockScope( string $name ): bool { |
| 57 | return isset( Consts::$blockElems[$name] ) || |
| 58 | isset( Consts::$alwaysBlockElems[$name] ); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * In the legacy parser, these block tags close block-tag scope |
| 63 | * See doBlockLevels in the PHP parser (includes/parser/Parser.php). |
| 64 | * |
| 65 | * @param string $name |
| 66 | * @return bool |
| 67 | */ |
| 68 | public static function tagClosesBlockScope( string $name ): bool { |
| 69 | return isset( Consts::$antiBlockElems[$name] ) || |
| 70 | isset( Consts::$neverBlockElems[$name] ); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Is this a template token? |
| 75 | * @param Token|string|null $token |
| 76 | * @return bool |
| 77 | */ |
| 78 | public static function isTemplateToken( $token ): bool { |
| 79 | return $token instanceof SelfclosingTagTk && $token->getName() === 'template'; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Determine whether the current token was an HTML tag in wikitext. |
| 84 | * |
| 85 | * @param Token|string|null $token |
| 86 | * @return bool |
| 87 | */ |
| 88 | public static function isHTMLTag( $token ): bool { |
| 89 | return $token && !is_string( $token ) && |
| 90 | ( $token instanceof TagTk || |
| 91 | $token instanceof EndTagTk || |
| 92 | $token instanceof SelfClosingTagTk ) && |
| 93 | isset( $token->dataParsoid->stx ) && |
| 94 | $token->dataParsoid->stx === 'html'; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Is the token a DOMFragment type value? |
| 99 | * |
| 100 | * @param Token $token |
| 101 | * @return bool |
| 102 | */ |
| 103 | public static function hasDOMFragmentType( Token $token ): bool { |
| 104 | return self::matchTypeOf( $token, '#^mw:DOMFragment(/sealed/\w+)?$#D' ) !== null; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Is the token a table tag? |
| 109 | * |
| 110 | * @param Token|string $token |
| 111 | * @return bool |
| 112 | */ |
| 113 | public static function isTableTag( $token ): bool { |
| 114 | return ( $token instanceof TagTk || $token instanceof EndTagTk ) && |
| 115 | isset( Consts::$HTML['TableTags'][$token->getName()] ); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Determine if token is a transparent link tag |
| 120 | * |
| 121 | * @param Token|string $token |
| 122 | * @return bool |
| 123 | */ |
| 124 | public static function isSolTransparentLinkTag( $token ): bool { |
| 125 | return ( |
| 126 | $token instanceof SelfclosingTagTk || |
| 127 | $token instanceof TagTk || |
| 128 | $token instanceof EndTagTk |
| 129 | ) && |
| 130 | $token->getName() === 'link' && |
| 131 | preg_match( self::SOL_TRANSPARENT_LINK_REGEX, $token->getAttributeV( 'rel' ) ?? '' ); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Does this token represent a behavior switch? |
| 136 | * |
| 137 | * @param Env $env |
| 138 | * @param Token|string $token |
| 139 | * @return bool |
| 140 | */ |
| 141 | public static function isBehaviorSwitch( Env $env, $token ): bool { |
| 142 | return $token instanceof SelfclosingTagTk && ( |
| 143 | // Before BehaviorSwitchHandler (ie. PreHandler, etc.) |
| 144 | $token->getName() === 'behavior-switch' || |
| 145 | // After BehaviorSwitchHandler |
| 146 | // (ie. ListHandler, ParagraphWrapper, etc.) |
| 147 | ( $token->getName() === 'meta' && |
| 148 | $token->hasAttribute( 'property' ) && |
| 149 | preg_match( $env->getSiteConfig()->bswPagePropRegexp(), |
| 150 | $token->getAttributeV( 'property' ) ?? '' ) |
| 151 | ) ); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * This should come close to matching |
| 156 | * {@link DOMUtils.emitsSolTransparentSingleLineWT}, |
| 157 | * without the single line caveat. |
| 158 | * @param Env $env |
| 159 | * @param Token|string $token |
| 160 | * @return bool |
| 161 | */ |
| 162 | public static function isSolTransparent( Env $env, $token ): bool { |
| 163 | if ( is_string( $token ) ) { |
| 164 | return (bool)preg_match( '/^\s*$/D', $token ); |
| 165 | } elseif ( self::isSolTransparentLinkTag( $token ) ) { |
| 166 | return true; |
| 167 | } elseif ( $token instanceof CommentTk && !self::isTranslationUnitMarker( $env, $token ) ) { |
| 168 | return true; |
| 169 | } elseif ( self::isBehaviorSwitch( $env, $token ) ) { |
| 170 | return true; |
| 171 | } elseif ( !$token instanceof SelfclosingTagTk || $token->getName() !== 'meta' ) { |
| 172 | return false; |
| 173 | } else { // only metas left |
| 174 | return !( isset( $token->dataParsoid->stx ) && $token->dataParsoid->stx === 'html' ); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * HACK: Returns true if $token looks like a TU marker (<!--T:XXX-->) and if we could be in a |
| 180 | * translate-annotated page. |
| 181 | * @param Env $env |
| 182 | * @param CommentTk $token |
| 183 | * @return bool |
| 184 | */ |
| 185 | public static function isTranslationUnitMarker( Env $env, CommentTk $token ): bool { |
| 186 | return $env->hasAnnotations && |
| 187 | $env->getSiteConfig()->isAnnotationTag( 'translate' ) && |
| 188 | preg_match( '/^T:/', $token->value ) === 1; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Is token a transparent link tag? |
| 193 | * |
| 194 | * @param Token|string $token |
| 195 | * @return bool |
| 196 | */ |
| 197 | public static function isEmptyLineMetaToken( $token ): bool { |
| 198 | return $token instanceof SelfclosingTagTk && |
| 199 | $token->getName() === 'meta' && |
| 200 | $token->getAttributeV( 'typeof' ) === 'mw:EmptyLine'; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Determine whether the token matches the given `typeof` attribute value. |
| 205 | * |
| 206 | * @param Token $t The token to test |
| 207 | * @param string $typeRe Regular expression matching the expected value of |
| 208 | * the `typeof` attribute. |
| 209 | * @return ?string The matching `typeof` value, or `null` if there is |
| 210 | * no match. |
| 211 | */ |
| 212 | public static function matchTypeOf( Token $t, string $typeRe ): ?string { |
| 213 | $v = $t->getAttributeV( 'typeof' ); |
| 214 | if ( $v === null ) { |
| 215 | return null; |
| 216 | } |
| 217 | Assert::invariant( is_string( $v ), "Typeof is not simple" ); |
| 218 | foreach ( preg_split( '/\s+/', $v, -1, PREG_SPLIT_NO_EMPTY ) as $ty ) { |
| 219 | $count = preg_match( $typeRe, $ty ); |
| 220 | Assert::invariant( $count !== false, "Bad regexp" ); |
| 221 | if ( $count ) { |
| 222 | return $ty; |
| 223 | } |
| 224 | } |
| 225 | return null; |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * Determine whether the token matches the given typeof attribute value. |
| 230 | * |
| 231 | * @param Token $t |
| 232 | * @param string $type Expected value of "typeof" attribute, as a literal |
| 233 | * string. |
| 234 | * @return bool True if the token matches. |
| 235 | */ |
| 236 | public static function hasTypeOf( Token $t, string $type ): bool { |
| 237 | return self::matchTypeOf( |
| 238 | $t, '/^' . preg_quote( $type, '/' ) . '$/D' |
| 239 | ) !== null; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Shift TSR of a token |
| 244 | * |
| 245 | * Port warning: in JS this was sometimes called with $offset=undefined, which meant do |
| 246 | * nothing by default, except if there was a third parameter set to true, in which case it |
| 247 | * meant the same thing as $offset = null. We can't pass in undefined in PHP, so this should |
| 248 | * usually be handled with isset() is the caller. But isset() returns true if the variable is |
| 249 | * null, so let's use false instead of null for whatever the previous code meant by a null |
| 250 | * offset. |
| 251 | * |
| 252 | * @param Token[] $tokens |
| 253 | * @param int|false $offset |
| 254 | */ |
| 255 | public static function shiftTokenTSR( array $tokens, $offset ): void { |
| 256 | // Bail early if we can |
| 257 | if ( $offset === 0 ) { |
| 258 | return; |
| 259 | } |
| 260 | |
| 261 | // JS b/c |
| 262 | if ( $offset === null ) { |
| 263 | $offset = false; |
| 264 | } |
| 265 | |
| 266 | // update/clear tsr |
| 267 | for ( $i = 0, $n = count( $tokens ); $i < $n; $i++ ) { |
| 268 | $t = $tokens[$i]; |
| 269 | switch ( is_object( $t ) ? get_class( $t ) : null ) { |
| 270 | case TagTk::class: |
| 271 | case SelfclosingTagTk::class: |
| 272 | case NlTk::class: |
| 273 | case CommentTk::class: |
| 274 | case EndTagTk::class: |
| 275 | $da = $t->dataParsoid; |
| 276 | $tsr = $da->tsr; |
| 277 | if ( $tsr ) { |
| 278 | if ( $offset ) { |
| 279 | $da->tsr = $tsr->offset( $offset ); |
| 280 | } else { |
| 281 | $da->tsr = null; |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | if ( $offset && isset( $da->extTagOffsets ) ) { |
| 286 | $da->extTagOffsets = |
| 287 | $da->extTagOffsets->offset( $offset ); |
| 288 | } |
| 289 | |
| 290 | // SSS FIXME: offset will always be available in |
| 291 | // chunky-tokenizer mode in which case we wont have |
| 292 | // buggy offsets below. The null scenario is only |
| 293 | // for when the token-stream-patcher attempts to |
| 294 | // reparse a string -- it is likely to only patch up |
| 295 | // small string fragments and the complicated use cases |
| 296 | // below should not materialize. |
| 297 | // CSA: token-stream-patcher shouldn't have problems |
| 298 | // now that $frame->srcText is always accurate? |
| 299 | |
| 300 | // content offsets for ext-links |
| 301 | if ( $offset && isset( $da->extLinkContentOffsets ) ) { |
| 302 | $da->extLinkContentOffsets = |
| 303 | $da->extLinkContentOffsets->offset( $offset ); |
| 304 | } |
| 305 | |
| 306 | // Process attributes |
| 307 | if ( isset( $t->attribs ) ) { |
| 308 | for ( $j = 0, $m = count( $t->attribs ); $j < $m; $j++ ) { |
| 309 | $a = $t->attribs[$j]; |
| 310 | if ( is_array( $a->k ) ) { |
| 311 | self::shiftTokenTSR( $a->k, $offset ); |
| 312 | } |
| 313 | if ( is_array( $a->v ) ) { |
| 314 | self::shiftTokenTSR( $a->v, $offset ); |
| 315 | } |
| 316 | |
| 317 | // src offsets used to set mw:TemplateParams |
| 318 | if ( !$offset ) { |
| 319 | $a->srcOffsets = null; |
| 320 | } elseif ( $a->srcOffsets !== null ) { |
| 321 | $a->srcOffsets = $a->srcOffsets->offset( $offset ); |
| 322 | } |
| 323 | } |
| 324 | } |
| 325 | break; |
| 326 | |
| 327 | default: |
| 328 | break; |
| 329 | } |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * Strip EOFTk token from token chunk. |
| 335 | * The EOFTk is expected to be the last token of the chunk. |
| 336 | * |
| 337 | * @param array &$tokens |
| 338 | * @return array return the modified token array so that this call can be chained |
| 339 | */ |
| 340 | public static function stripEOFTkFromTokens( array &$tokens ): array { |
| 341 | $n = count( $tokens ); |
| 342 | if ( $n && $tokens[$n - 1] instanceof EOFTk ) { |
| 343 | array_pop( $tokens ); |
| 344 | } |
| 345 | return $tokens; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Convert string offsets |
| 350 | * |
| 351 | * Offset types are: |
| 352 | * - 'byte': Bytes (UTF-8 encoding), e.g. PHP `substr()` or `strlen()`. |
| 353 | * - 'char': Unicode code points (encoding irrelevant), e.g. PHP `mb_substr()` or `mb_strlen()`. |
| 354 | * - 'ucs2': 16-bit code units (UTF-16 encoding), e.g. JavaScript `.substring()` or `.length`. |
| 355 | * |
| 356 | * Offsets that are mid-Unicode character are "rounded" up to the next full |
| 357 | * character, i.e. the output offset will always point to the start of a |
| 358 | * Unicode code point (or just past the end of the string). Offsets outside |
| 359 | * the string are "rounded" to 0 or just-past-the-end. |
| 360 | * |
| 361 | * @note When constructing the array of offsets to pass to this method, |
| 362 | * populate it with references as `$offsets[] = &$var;`. |
| 363 | * |
| 364 | * @param string $s Unicode string the offsets are offsets into, UTF-8 encoded. |
| 365 | * @param string $from Offset type to convert from. |
| 366 | * @param string $to Offset type to convert to. |
| 367 | * @param int[] $offsets References to the offsets to convert. |
| 368 | */ |
| 369 | public static function convertOffsets( |
| 370 | string $s, string $from, string $to, array $offsets |
| 371 | ): void { |
| 372 | static $valid = [ 'byte', 'char', 'ucs2' ]; |
| 373 | if ( !in_array( $from, $valid, true ) ) { |
| 374 | throw new \InvalidArgumentException( 'Invalid $from' ); |
| 375 | } |
| 376 | if ( !in_array( $to, $valid, true ) ) { |
| 377 | throw new \InvalidArgumentException( 'Invalid $to' ); |
| 378 | } |
| 379 | |
| 380 | $i = 0; |
| 381 | $offsetCt = count( $offsets ); |
| 382 | if ( $offsetCt === 0 ) { // Nothing to do |
| 383 | return; |
| 384 | } |
| 385 | sort( $offsets, SORT_NUMERIC ); |
| 386 | |
| 387 | $bytePos = 0; |
| 388 | $ucs2Pos = 0; |
| 389 | $charPos = 0; |
| 390 | |
| 391 | $fromPos = &${$from . 'Pos'}; // @phan-suppress-current-line PhanPluginDollarDollar |
| 392 | $toPos = &${$to . 'Pos'}; // @phan-suppress-current-line PhanPluginDollarDollar |
| 393 | |
| 394 | $byteLen = strlen( $s ); |
| 395 | while ( $bytePos < $byteLen ) { |
| 396 | // Update offsets that we've reached |
| 397 | while ( $offsets[$i] <= $fromPos ) { |
| 398 | $offsets[$i] = $toPos; |
| 399 | if ( ++$i >= $offsetCt ) { |
| 400 | return; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | // Update positions |
| 405 | ++$charPos; |
| 406 | $c = ord( $s[$bytePos] ) & 0xf8; |
| 407 | switch ( $c ) { |
| 408 | case 0x00: |
| 409 | case 0x08: |
| 410 | case 0x10: |
| 411 | case 0x18: |
| 412 | case 0x20: |
| 413 | case 0x28: |
| 414 | case 0x30: |
| 415 | case 0x38: |
| 416 | case 0x40: |
| 417 | case 0x48: |
| 418 | case 0x50: |
| 419 | case 0x58: |
| 420 | case 0x60: |
| 421 | case 0x68: |
| 422 | case 0x70: |
| 423 | case 0x78: |
| 424 | ++$bytePos; |
| 425 | ++$ucs2Pos; |
| 426 | break; |
| 427 | |
| 428 | case 0xc0: |
| 429 | case 0xc8: |
| 430 | case 0xd0: |
| 431 | case 0xd8: |
| 432 | $bytePos += 2; |
| 433 | ++$ucs2Pos; |
| 434 | break; |
| 435 | |
| 436 | case 0xe0: |
| 437 | case 0xe8: |
| 438 | $bytePos += 3; |
| 439 | ++$ucs2Pos; |
| 440 | break; |
| 441 | |
| 442 | case 0xf0: |
| 443 | $bytePos += 4; |
| 444 | $ucs2Pos += 2; |
| 445 | break; |
| 446 | |
| 447 | default: |
| 448 | throw new \InvalidArgumentException( '$s is not UTF-8' ); |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | // Convert any offsets past the end of the string to the length of the |
| 453 | // string. |
| 454 | while ( $i < $offsetCt ) { |
| 455 | $offsets[$i] = $toPos; |
| 456 | ++$i; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * Convert offsets in a token array |
| 462 | * |
| 463 | * @see TokenUtils::convertOffsets() |
| 464 | * |
| 465 | * @param string $s The offset reference string |
| 466 | * @param string $from Offset type to convert from |
| 467 | * @param string $to Offset type to convert to |
| 468 | * @param array<Token|string|array> $tokens |
| 469 | */ |
| 470 | public static function convertTokenOffsets( |
| 471 | string $s, string $from, string $to, array $tokens |
| 472 | ): void { |
| 473 | $offsets = []; /* @var array<int> $offsets */ |
| 474 | self::collectOffsets( $tokens, static function ( $sr ) use ( &$offsets ) { |
| 475 | if ( $sr instanceof DomSourceRange ) { |
| 476 | // Adjust the widths to be actual character offsets |
| 477 | if ( $sr->openWidth !== null ) { |
| 478 | Assert::invariant( $sr->start !== null, "width w/o start" ); |
| 479 | $sr->openWidth = $sr->start + $sr->openWidth; |
| 480 | $offsets[] =& $sr->openWidth; |
| 481 | } |
| 482 | if ( $sr->closeWidth !== null ) { |
| 483 | Assert::invariant( $sr->end !== null, "width w/o end" ); |
| 484 | $sr->closeWidth = $sr->end - $sr->closeWidth; |
| 485 | $offsets[] =& $sr->closeWidth; |
| 486 | } |
| 487 | } |
| 488 | if ( $sr->start !== null ) { |
| 489 | $offsets[] =& $sr->start; |
| 490 | } |
| 491 | if ( $sr->end !== null ) { |
| 492 | $offsets[] =& $sr->end; |
| 493 | } |
| 494 | } ); |
| 495 | self::convertOffsets( $s, $from, $to, $offsets ); |
| 496 | self::collectOffsets( $tokens, static function ( $sr ) use ( &$offsets ) { |
| 497 | if ( $sr instanceof DomSourceRange ) { |
| 498 | // Adjust widths back from being character offsets |
| 499 | if ( $sr->openWidth !== null ) { |
| 500 | $sr->openWidth -= $sr->start; |
| 501 | } |
| 502 | if ( $sr->closeWidth !== null ) { |
| 503 | $sr->closeWidth = $sr->end - $sr->closeWidth; |
| 504 | } |
| 505 | } |
| 506 | } ); |
| 507 | } |
| 508 | |
| 509 | /** |
| 510 | * @param array<Token>|array<KV>|KV|Token|DomSourceRange|KVSourceRange|SourceRange|string $input |
| 511 | * @param callable $offsetFunc |
| 512 | */ |
| 513 | private static function collectOffsets( $input, callable $offsetFunc ): void { |
| 514 | if ( is_array( $input ) ) { |
| 515 | foreach ( $input as $token ) { |
| 516 | self::collectOffsets( $token, $offsetFunc ); |
| 517 | } |
| 518 | } elseif ( $input instanceof KV ) { |
| 519 | self::collectOffsets( $input->k, $offsetFunc ); |
| 520 | self::collectOffsets( $input->v, $offsetFunc ); |
| 521 | if ( $input->srcOffsets ) { |
| 522 | self::collectOffsets( $input->srcOffsets, $offsetFunc ); |
| 523 | } |
| 524 | } elseif ( $input instanceof Token ) { |
| 525 | if ( isset( $input->dataParsoid->tsr ) ) { |
| 526 | self::collectOffsets( $input->dataParsoid->tsr, $offsetFunc ); |
| 527 | } |
| 528 | if ( isset( $input->dataParsoid->extLinkContentOffsets ) ) { |
| 529 | self::collectOffsets( $input->dataParsoid->extLinkContentOffsets, $offsetFunc ); |
| 530 | } |
| 531 | if ( isset( $input->dataParsoid->tokens ) ) { |
| 532 | self::collectOffsets( $input->dataParsoid->tokens, $offsetFunc ); |
| 533 | } |
| 534 | if ( isset( $input->dataParsoid->extTagOffsets ) ) { |
| 535 | self::collectOffsets( $input->dataParsoid->extTagOffsets, $offsetFunc ); |
| 536 | } |
| 537 | self::collectOffsets( $input->attribs, $offsetFunc ); |
| 538 | } elseif ( $input instanceof KVSourceRange ) { |
| 539 | self::collectOffsets( $input->key, $offsetFunc ); |
| 540 | self::collectOffsets( $input->value, $offsetFunc ); |
| 541 | } elseif ( $input instanceof SourceRange ) { |
| 542 | // This includes DomSourceRange |
| 543 | $offsetFunc( $input ); |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | /** |
| 548 | * Tests whether token represents an HTML entity. |
| 549 | * Think `<span typeof="mw:Entity">`. |
| 550 | * @param Token|string|null $token |
| 551 | * @return bool |
| 552 | */ |
| 553 | public static function isEntitySpanToken( $token ): bool { |
| 554 | return $token && |
| 555 | $token instanceof TagTk && |
| 556 | $token->getName() === 'span' && |
| 557 | self::hasTypeOf( $token, 'mw:Entity' ); |
| 558 | } |
| 559 | |
| 560 | /** |
| 561 | * Transform `"\n"` and `"\r\n"` in the input string to {@link NlTk} tokens. |
| 562 | * @param string $str |
| 563 | * @return array (interspersed string and NlTk tokens) |
| 564 | */ |
| 565 | public static function newlinesToNlTks( string $str ): array { |
| 566 | $toks = preg_split( '/\n|\r\n/', $str ); |
| 567 | $ret = []; |
| 568 | // Add one NlTk between each pair, hence toks.length-1 |
| 569 | for ( $i = 0, $n = count( $toks ) - 1; $i < $n; $i++ ) { |
| 570 | $ret[] = $toks[$i]; |
| 571 | $ret[] = new NlTk( null ); |
| 572 | } |
| 573 | $ret[] = $toks[$i]; |
| 574 | return $ret; |
| 575 | } |
| 576 | |
| 577 | /** |
| 578 | * Flatten/convert a token array into a string. |
| 579 | * @param string|Token|array<Token|string> $tokens |
| 580 | * @param bool $strict Whether to abort as soon as we find a token we |
| 581 | * can't stringify. |
| 582 | * @param array<string,bool|Env> $opts |
| 583 | * @return string|array{0:string,1:Array<Token|string>} |
| 584 | * The stringified tokens. If $strict is true, returns a two-element |
| 585 | * array containing string prefix and the remainder of the tokens as |
| 586 | * soon as we encounter something we can't stringify. |
| 587 | * |
| 588 | * Unsure why phan is whining about $opts array accesses. |
| 589 | * So for now, I am simply suppressing those warnings. |
| 590 | */ |
| 591 | public static function tokensToString( $tokens, bool $strict = false, array $opts = [] ) { |
| 592 | if ( is_string( $tokens ) ) { |
| 593 | return $tokens; |
| 594 | } |
| 595 | |
| 596 | if ( !is_array( $tokens ) ) { |
| 597 | $tokens = [ $tokens ]; |
| 598 | } |
| 599 | |
| 600 | $out = ''; |
| 601 | for ( $i = 0, $l = count( $tokens ); $i < $l; $i++ ) { |
| 602 | $token = $tokens[$i]; |
| 603 | if ( $token === null ) { |
| 604 | throw new UnreachableException( "No nulls expected." ); |
| 605 | } elseif ( $token instanceof KV ) { |
| 606 | // Since this function is occasionally called on KV->v, |
| 607 | // whose signature recursively includes KV[], a mismatch with |
| 608 | // this function, we assert that those values are only |
| 609 | // included in safe places that don't intend to stringify |
| 610 | // their tokens. |
| 611 | throw new UnreachableException( "No KVs expected." ); |
| 612 | } elseif ( is_string( $token ) ) { |
| 613 | $out .= $token; |
| 614 | } elseif ( is_array( $token ) ) { |
| 615 | Assert::invariant( !$strict, "strict case handled above" ); |
| 616 | $out .= self::tokensToString( $token, $strict, $opts ); |
| 617 | } elseif ( |
| 618 | $token instanceof CommentTk || |
| 619 | ( empty( $opts['retainNLs'] ) && $token instanceof NlTk ) |
| 620 | ) { |
| 621 | // strip comments and newlines |
| 622 | } elseif ( !empty( $opts['stripEmptyLineMeta'] ) && self::isEmptyLineMetaToken( $token ) ) { |
| 623 | // If requested, strip empty line meta tokens too. |
| 624 | } elseif ( !empty( $opts['includeEntities'] ) && self::isEntitySpanToken( $token ) ) { |
| 625 | $out .= $token->dataParsoid->src; |
| 626 | $i += 2; // Skip child and end tag. |
| 627 | } elseif ( $strict ) { |
| 628 | // If strict, return accumulated string on encountering first non-text token |
| 629 | return [ $out, array_slice( $tokens, $i ) ]; |
| 630 | } elseif ( |
| 631 | // This option shouldn't be used if the tokens have been |
| 632 | // expanded to DOM |
| 633 | !empty( $opts['unpackDOMFragments'] ) && |
| 634 | ( $token instanceof TagTk || $token instanceof SelfclosingTagTk ) && |
| 635 | self::hasDOMFragmentType( $token ) |
| 636 | ) { |
| 637 | // Handle dom fragments |
| 638 | $domFragment = $opts['env']->getDOMFragment( |
| 639 | $token->dataParsoid->html |
| 640 | ); |
| 641 | // Calling `env->removeDOMFragment()` here is case dependent |
| 642 | // but should be rare enough when permissible that it can be |
| 643 | // ignored. |
| 644 | // FIXME: The correct thing to do would be to return |
| 645 | // `$domFragment.innerHTML` for the current scenarios where |
| 646 | // `unpackDOMFragments` is used (expanded attribute |
| 647 | // values and reparses thereof) but we'd need to remove |
| 648 | // the span wrapping and typeof annotation of extension |
| 649 | // content and nowikis. Since we're primarily expecting |
| 650 | // to find <translate> and <nowiki> here, this will do. |
| 651 | $out .= $domFragment->textContent; |
| 652 | if ( $token instanceof TagTk ) { |
| 653 | $i += 1; // Skip the EndTagTK |
| 654 | Assert::invariant( |
| 655 | $i >= $l || $tokens[$i] instanceof EndTagTk, |
| 656 | "tag should be followed by endtag" |
| 657 | ); |
| 658 | } |
| 659 | } |
| 660 | } |
| 661 | return $out; |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * Convert an array of key-value pairs into a hash of keys to values. |
| 666 | * For duplicate keys, the last entry wins. |
| 667 | * @param array<KV> $kvs |
| 668 | * @return array<string,Token[]>|array<string,string> |
| 669 | */ |
| 670 | public static function kvToHash( array $kvs ): array { |
| 671 | $res = []; |
| 672 | foreach ( $kvs as $kv ) { |
| 673 | $key = trim( self::tokensToString( $kv->k ) ); |
| 674 | // SSS FIXME: Temporary fix to handle extensions which use |
| 675 | // entities in attribute values. We need more robust handling |
| 676 | // of non-string template attribute values in general. |
| 677 | $val = self::tokensToString( $kv->v ); |
| 678 | $res[mb_strtolower( $key )] = self::tokenTrim( $val ); |
| 679 | } |
| 680 | return $res; |
| 681 | } |
| 682 | |
| 683 | /** |
| 684 | * Trim space and newlines from leading and trailing text tokens. |
| 685 | * @param string|Token|(Token|string)[] $tokens |
| 686 | * @return string|Token|(Token|string)[] |
| 687 | */ |
| 688 | public static function tokenTrim( $tokens ) { |
| 689 | if ( !is_array( $tokens ) ) { |
| 690 | if ( is_string( $tokens ) ) { |
| 691 | return trim( $tokens ); |
| 692 | } |
| 693 | return $tokens; |
| 694 | } |
| 695 | |
| 696 | $n = count( $tokens ); |
| 697 | |
| 698 | // strip leading space |
| 699 | foreach ( $tokens as &$token ) { |
| 700 | if ( $token instanceof NlTk ) { |
| 701 | $token = ''; |
| 702 | } elseif ( is_string( $token ) ) { |
| 703 | $token = preg_replace( '/^\s+/', '', $token, 1 ); |
| 704 | if ( $token !== '' ) { |
| 705 | break; |
| 706 | } |
| 707 | } else { |
| 708 | break; |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | // strip trailing space |
| 713 | for ( $i = $n - 1; $i >= 0; $i-- ) { |
| 714 | $token = &$tokens[$i]; |
| 715 | if ( $token instanceof NlTk ) { |
| 716 | $token = ''; // replace newline with empty |
| 717 | } elseif ( is_string( $token ) ) { |
| 718 | $token = preg_replace( '/\s+$/D', '', $token, 1 ); |
| 719 | if ( $token !== '' ) { |
| 720 | break; |
| 721 | } |
| 722 | } else { |
| 723 | break; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | return $tokens; |
| 728 | } |
| 729 | |
| 730 | /** |
| 731 | * Checks whether the provided meta tag token is an annotation start token |
| 732 | * @param Token $t |
| 733 | * @return bool |
| 734 | */ |
| 735 | public static function isAnnotationStartToken( Token $t ): bool { |
| 736 | $type = self::matchTypeOf( $t, WTUtils::ANNOTATION_META_TYPE_REGEXP ); |
| 737 | return $type !== null && !str_ends_with( $type, '/End' ); |
| 738 | } |
| 739 | |
| 740 | /** |
| 741 | * Checks whether the provided meta tag token is an annotation end token |
| 742 | * @param Token $t |
| 743 | * @return bool |
| 744 | */ |
| 745 | public static function isAnnotationEndToken( Token $t ): bool { |
| 746 | $type = self::matchTypeOf( $t, WTUtils::ANNOTATION_META_TYPE_REGEXP ); |
| 747 | return $type !== null && str_ends_with( $type, '/End' ); |
| 748 | } |
| 749 | } |