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| 1 | <?php |
| 2 | |
| 3 | declare( strict_types = 1 ); |
| 4 | |
| 5 | namespace MediaWiki\Extension\Math\WikiTexVC\Nodes; |
| 6 | |
| 7 | use Generator; |
| 8 | use InvalidArgumentException; |
| 9 | use MediaWiki\Extension\Math\WikiTexVC\MMLmappings\BaseMappings; |
| 10 | use MediaWiki\Extension\Math\WikiTexVC\MMLmappings\Util\MMLParsingUtil; |
| 11 | use MediaWiki\Extension\Math\WikiTexVC\MMLmappings\Util\MMLutil; |
| 12 | use MediaWiki\Extension\Math\WikiTexVC\MMLnodes\MMLmo; |
| 13 | use MediaWiki\Extension\Math\WikiTexVC\MMLnodes\MMLmrow; |
| 14 | use MediaWiki\Extension\Math\WikiTexVC\MMLnodes\MMLmstyle; |
| 15 | use MediaWiki\Extension\Math\WikiTexVC\MMLnodes\MMLmsup; |
| 16 | use MediaWiki\Extension\Math\WikiTexVC\TexUtil; |
| 17 | |
| 18 | /** |
| 19 | * |
| 20 | */ |
| 21 | class TexArray extends TexNode implements \ArrayAccess, \IteratorAggregate { |
| 22 | protected bool $curly = false; |
| 23 | private ?LengthSpec $rowSpecs = null; |
| 24 | |
| 25 | public static function newCurly( ...$args ) { |
| 26 | $node = new self( ...$args ); |
| 27 | $node->curly = true; |
| 28 | return $node; |
| 29 | } |
| 30 | |
| 31 | public function __construct( ...$args ) { |
| 32 | $nargs = []; |
| 33 | |
| 34 | foreach ( $args as &$arg ) { |
| 35 | if ( $arg !== null ) { |
| 36 | array_push( $nargs, $arg ); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | self::checkInput( $nargs ); |
| 41 | parent::__construct( ...$nargs ); |
| 42 | } |
| 43 | |
| 44 | public function checkForStyleArgs( $node ) { |
| 45 | if ( $node instanceof Literal ) { |
| 46 | $name = trim( $node->getArg() ); |
| 47 | switch ( $name ) { |
| 48 | case "\\displaystyle": |
| 49 | return [ "displaystyle" => "true", "scriptlevel" => "0" ]; |
| 50 | case "\\scriptstyle": |
| 51 | return [ "displaystyle" => "false", "scriptlevel" => "1" ]; |
| 52 | case "\\scriptscriptstyle": |
| 53 | return [ "displaystyle" => "false", "scriptlevel" => "2" ]; |
| 54 | case "\\textstyle": |
| 55 | return [ "displaystyle" => "false", "scriptlevel" => "0" ]; |
| 56 | } |
| 57 | } |
| 58 | return null; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Checks if an TexNode of Literal contains color information (color, pagecolor) |
| 63 | * and returns info how to continue with the parsing. |
| 64 | * @param TexNode $node node to check if it contains color info |
| 65 | * @return array index 0: (bool) was color element found, index 1: (string) specified color |
| 66 | */ |
| 67 | public function checkForColor( TexNode $node ) { |
| 68 | if ( $node instanceof Literal ) { |
| 69 | $name = trim( $node->getArg() ); |
| 70 | if ( str_contains( $name, "\\color" ) ) { |
| 71 | $foundOperatorContent = MMLutil::initalParseLiteralExpression( $node->getArg() ); |
| 72 | if ( !$foundOperatorContent ) { |
| 73 | // discarding color elements which not specify color |
| 74 | return [ true, null ]; |
| 75 | } else { |
| 76 | return [ true, $foundOperatorContent[2][0] ]; |
| 77 | } |
| 78 | } elseif ( str_contains( $name, "\\pagecolor" ) ) { |
| 79 | return [ true, null ]; |
| 80 | } |
| 81 | } |
| 82 | return [ false, null ]; |
| 83 | } |
| 84 | |
| 85 | public function checkForColorDefinition( TexNode $node ): ?array { |
| 86 | if ( $node instanceof Literal ) { |
| 87 | $name = trim( $node->getArg() ); |
| 88 | if ( str_contains( $name, "\\definecolor" ) ) { |
| 89 | return MMLParsingUtil::parseDefineColorExpression( $node->getArg() ); |
| 90 | } |
| 91 | } |
| 92 | return null; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Checks two sequential nodes in TexArray if they contain information on sideset expressions. |
| 97 | * @param TexNode $currentNode first node in array to check (for sideset expression) |
| 98 | * @param TexNode|null $nextNode second node in array to check (for succeeding operator) |
| 99 | * @return TexNode|null the succeeding operator for further Parsing or null if sideset not found or invalid |
| 100 | */ |
| 101 | public function checkForSideset( TexNode $currentNode, ?TexNode $nextNode ): ?TexNode { |
| 102 | if ( !( $currentNode instanceof Fun2nb && $currentNode->getFname() == "\\sideset" ) ) { |
| 103 | return null; |
| 104 | } |
| 105 | if ( $nextNode instanceof Literal ) { |
| 106 | return $nextNode; |
| 107 | } |
| 108 | if ( $nextNode instanceof FQ ) { |
| 109 | return $nextNode; |
| 110 | } |
| 111 | return null; |
| 112 | } |
| 113 | |
| 114 | public function checkForLimits( $currentNode, $nextNode ) { |
| 115 | // Preceding 'lim' in example: "\\lim_{x \\to 2}" |
| 116 | if ( ( $currentNode instanceof DQ || $currentNode instanceof FQ ) |
| 117 | && $currentNode->containsFunc( "\\lim" ) ) { |
| 118 | |
| 119 | if ( $currentNode->getBase() instanceof TexArray ) { |
| 120 | return [ $currentNode->getBase()->getArgs()[0], false ]; |
| 121 | } else { |
| 122 | return [ $currentNode->getBase(), false ]; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /** Find cases which have preceding Literals with nullary_macro-type operators i.e.: |
| 127 | * "\iint\limits_D \, dx\,dy" |
| 128 | */ |
| 129 | $tu = TexUtil::getInstance(); |
| 130 | |
| 131 | // Check whether the current node is a possible preceding literal |
| 132 | if ( !( |
| 133 | // logically superfluous brackets were inserted to improve readability |
| 134 | ( $currentNode instanceof Literal && |
| 135 | // Check if the current node is a nullary macro such as \iint, \sum, \prod, etc. |
| 136 | ( $tu->nullary_macro( trim( $currentNode->getArg() ) ) |
| 137 | // or a limit operator |
| 138 | || ( trim( $currentNode->getArg() ) == "\\lim" ) ) ) || |
| 139 | // or the special case of \operatorname |
| 140 | ( $currentNode instanceof Fun1nb && $currentNode->getFname() == "\\operatorname" ) |
| 141 | ) ) { |
| 142 | return [ null, false ]; |
| 143 | } |
| 144 | |
| 145 | // Check whether the next node is a possible limits construct |
| 146 | if ( !( ( $nextNode instanceof DQ || $nextNode instanceof FQ ) |
| 147 | && $nextNode->getBase() instanceof Literal |
| 148 | && ( $nextNode->containsFunc( "\\limits" ) || $nextNode->containsFunc( "\\nolimits" ) ) |
| 149 | ) ) { |
| 150 | return [ null, false ]; |
| 151 | |
| 152 | } |
| 153 | return [ $currentNode, true ]; |
| 154 | } |
| 155 | |
| 156 | public function checkForNot( $currentNode ): bool { |
| 157 | if ( $currentNode instanceof Literal && trim( $currentNode->getArg() ) == "\\not" ) { |
| 158 | return true; |
| 159 | } |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | public function checkForDerivatives( $iStart, $args ): int { |
| 164 | $ctr = 0; |
| 165 | for ( $i = $iStart, $count = count( $this->args ); $i < $count; $i++ ) { |
| 166 | $followUp = $args[$i]; |
| 167 | if ( $followUp instanceof Literal && $followUp->getArg() === "'" ) { |
| 168 | $ctr++; |
| 169 | } else { |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | return $ctr; |
| 175 | } |
| 176 | |
| 177 | public function checkForNamedFctArgs( $currentNode, $nextNode ) { |
| 178 | // Check if current node is named function |
| 179 | $hasNamedFct = false; |
| 180 | if ( $currentNode instanceof TexArray && count( $currentNode->args ) == 2 ) { |
| 181 | $tu = TexUtil::getInstance(); |
| 182 | $currentNodeContent = $currentNode[0]; |
| 183 | if ( $currentNodeContent instanceof Literal && |
| 184 | $tu->latex_function_names( $currentNodeContent->getArg() ) ) { |
| 185 | $hasNamedFct = true; |
| 186 | } |
| 187 | } elseif ( $currentNode instanceof Fun1nb && $currentNode->getFname() === '\\operatorname' ) { |
| 188 | $hasNamedFct = true; |
| 189 | } |
| 190 | |
| 191 | // Check if there is a valid argument as next parameter |
| 192 | $hasValidParameters = false; |
| 193 | if ( !$hasNamedFct ) { |
| 194 | return [ $hasNamedFct, $hasValidParameters ]; |
| 195 | } |
| 196 | |
| 197 | if ( $nextNode ) { |
| 198 | $hasValidParameters = true; |
| 199 | } |
| 200 | |
| 201 | return [ $hasNamedFct, $hasValidParameters ]; |
| 202 | } |
| 203 | |
| 204 | private function squashLiterals() { |
| 205 | $tmp = ''; |
| 206 | foreach ( $this->args as $arg ) { |
| 207 | if ( !( $arg instanceof Literal ) ) { |
| 208 | return; |
| 209 | } |
| 210 | // Don't squash if there is a macro in the literal |
| 211 | if ( preg_match( "/[\\\\]/", $arg->getArg() ) ) { |
| 212 | return; |
| 213 | } |
| 214 | $tmp .= $arg->getArg(); |
| 215 | } |
| 216 | $this->args = [ new Literal( $tmp ) ]; |
| 217 | $this->curly = false; |
| 218 | } |
| 219 | |
| 220 | public function renderMML( $arguments = [], $state = [] ) { |
| 221 | // Everything here is for parsing displaystyle, probably refactored to WikiTexVC grammar later |
| 222 | $fullRenderedArray = ""; |
| 223 | $mmlStyles = []; |
| 224 | $currentColor = null; |
| 225 | |
| 226 | if ( array_key_exists( 'squashLiterals', $state ) ) { |
| 227 | $this->squashLiterals(); |
| 228 | } |
| 229 | |
| 230 | for ( $i = 0, $count = count( $this->args ); $i < $count; $i++ ) { |
| 231 | $current = $this->args[$i]; |
| 232 | if ( isset( $this->args[$i + 1] ) ) { |
| 233 | $next = $this->args[$i + 1]; |
| 234 | } else { |
| 235 | $next = null; |
| 236 | } |
| 237 | // Check for sideset |
| 238 | $foundSideset = $this->checkForSideset( $current, $next ); |
| 239 | if ( $foundSideset ) { |
| 240 | $state["sideset"] = $foundSideset; |
| 241 | // Skipping the succeeding Literal |
| 242 | $i++; |
| 243 | } |
| 244 | |
| 245 | // Check for limits |
| 246 | $foundLimits = $this->checkForLimits( $current, $next ); |
| 247 | if ( $foundLimits[0] ) { |
| 248 | $state["limits"] = $foundLimits[0]; |
| 249 | if ( $foundLimits[1] ) { |
| 250 | continue; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | // Check for Not |
| 255 | $foundNot = $this->checkForNot( $current ); |
| 256 | if ( $foundNot ) { |
| 257 | $state["not"] = true; |
| 258 | continue; |
| 259 | } |
| 260 | |
| 261 | // Check for derivatives |
| 262 | $foundDeriv = $this->checkForDerivatives( $i + 1, $this->args ); |
| 263 | if ( $foundDeriv > 0 ) { |
| 264 | // skip the next indices which are derivative characters |
| 265 | $i += $foundDeriv; |
| 266 | $state["deriv"] = $foundDeriv; |
| 267 | } |
| 268 | |
| 269 | // Check if there is a new color definition and add it to state |
| 270 | $foundColorDef = $this->checkForColorDefinition( $current ); |
| 271 | if ( $foundColorDef ) { |
| 272 | $state["colorDefinitions"][$foundColorDef["name"]] = $foundColorDef; |
| 273 | continue; |
| 274 | } |
| 275 | // Pass preceding color info to state |
| 276 | $foundColor = $this->checkForColor( $current ); |
| 277 | if ( $foundColor[0] ) { |
| 278 | $currentColor = $foundColor[1]; |
| 279 | // Skipping the color element itself for rendering |
| 280 | continue; |
| 281 | } |
| 282 | $styleArguments = $this->checkForStyleArgs( $current ); |
| 283 | |
| 284 | $foundNamedFct = $this->checkForNamedFctArgs( $current, $next ); |
| 285 | if ( $foundNamedFct[0] ) { |
| 286 | $state["foundNamedFct"] = $foundNamedFct; |
| 287 | } |
| 288 | |
| 289 | if ( $styleArguments ) { |
| 290 | $state["styleargs"] = $styleArguments; |
| 291 | $mmlStyle = new MMLmstyle( "", $styleArguments ); |
| 292 | $fullRenderedArray .= $mmlStyle->getStart(); |
| 293 | if ( $next instanceof TexNode && $next->isCurly() ) { |
| 294 | // Wrap with style-tags when the next element is a Curly which determines start and end tag. |
| 295 | $fullRenderedArray .= $this->createMMLwithContext( $currentColor, $next, $state, $arguments ); |
| 296 | $fullRenderedArray .= $mmlStyle->getEnd(); |
| 297 | $mmlStyle = null; |
| 298 | unset( $state["styleargs"] ); |
| 299 | $i++; |
| 300 | } else { |
| 301 | // Start the style indicator in cases like \textstyle abc |
| 302 | $mmlStyles[] = $mmlStyle->getEnd(); |
| 303 | |
| 304 | } |
| 305 | } else { |
| 306 | $fullRenderedArray .= $this->createMMLwithContext( $currentColor, $current, $state, $arguments ); |
| 307 | } |
| 308 | |
| 309 | if ( array_key_exists( "not", $state ) ) { |
| 310 | unset( $state["not"] ); |
| 311 | } |
| 312 | if ( array_key_exists( "limits", $state ) ) { |
| 313 | unset( $state["limits"] ); |
| 314 | } |
| 315 | if ( array_key_exists( "deriv", $state ) ) { |
| 316 | unset( $state["deriv"] ); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | foreach ( array_reverse( $mmlStyles ) as $mmlStyleEnd ) { |
| 321 | $fullRenderedArray .= $mmlStyleEnd; |
| 322 | } |
| 323 | if ( $this->curly && $this->getLength() > 1 ) { |
| 324 | $mmlRow = new MMLmrow(); |
| 325 | return $mmlRow->encapsulateRaw( $fullRenderedArray ); |
| 326 | } |
| 327 | |
| 328 | return $fullRenderedArray; |
| 329 | } |
| 330 | |
| 331 | private function createMMLwithContext( $currentColor, $currentNode, $state, $arguments ) { |
| 332 | if ( $currentColor ) { |
| 333 | if ( array_key_exists( "colorDefinitions", $state ) |
| 334 | && is_array( $state["colorDefinitions"] ) |
| 335 | && array_key_exists( $currentColor, $state["colorDefinitions"] ?? [] ) |
| 336 | && is_array( $state["colorDefinitions"][$currentColor] ) |
| 337 | && array_key_exists( "hex", $state["colorDefinitions"][$currentColor] ) |
| 338 | ) { |
| 339 | $displayedColor = $state["colorDefinitions"][$currentColor]["hex"]; |
| 340 | |
| 341 | } else { |
| 342 | $resColor = BaseMappings::getColorByKey( $currentColor ); |
| 343 | $displayedColor = $resColor ? $resColor[0] : $currentColor; |
| 344 | } |
| 345 | $mmlStyleColor = new MMLmstyle( "", [ "mathcolor" => $displayedColor ] ); |
| 346 | $ret = $mmlStyleColor->encapsulateRaw( $currentNode->renderMML( $arguments, $state ) ); |
| 347 | } else { |
| 348 | $ret = $currentNode->renderMML( $arguments, $state ); |
| 349 | } |
| 350 | |
| 351 | return $this->addDerivativesContext( $state, $ret ); |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * If derivative was recognized, add the corresponding derivative math operator |
| 356 | * to the mml and wrap with msup element. |
| 357 | * @param array $state state indicator which indicates derivative |
| 358 | * @param string $mml mathml input |
| 359 | * @return string mml with additional mml-elements for derivatives |
| 360 | */ |
| 361 | public function addDerivativesContext( $state, string $mml ): string { |
| 362 | if ( array_key_exists( "deriv", $state ) && $state["deriv"] > 0 ) { |
| 363 | $msup = new MMLmsup(); |
| 364 | $moDeriv = new MMLmo(); |
| 365 | |
| 366 | if ( $state["deriv"] == 1 ) { |
| 367 | $derInfo = "′"; |
| 368 | } elseif ( $state["deriv"] == 2 ) { |
| 369 | $derInfo = "″"; |
| 370 | } elseif ( $state["deriv"] == 3 ) { |
| 371 | $derInfo = "‴"; |
| 372 | } elseif ( $state["deriv"] == 4 ) { |
| 373 | $derInfo = "⁗"; |
| 374 | } else { |
| 375 | $derInfo = str_repeat( "′", $state["deriv"] ); |
| 376 | } |
| 377 | |
| 378 | $mml = $msup->encapsulateRaw( $mml . $moDeriv->encapsulateRaw( $derInfo ) ); |
| 379 | } |
| 380 | return $mml; |
| 381 | } |
| 382 | |
| 383 | public function inCurlies() { |
| 384 | if ( isset( $this->args[0] ) && count( $this->args ) == 1 ) { |
| 385 | return $this->args[0]->inCurlies(); |
| 386 | } else { |
| 387 | return '{' . parent::render() . '}'; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | public function extractSubscripts() { |
| 392 | $y = []; |
| 393 | |
| 394 | foreach ( $this->args as $x ) { |
| 395 | $y = array_merge( $y, $x->extractSubscripts() ); |
| 396 | } |
| 397 | if ( isset( $this->args[0] ) && ( count( $this->args ) == count( $y ) ) ) { |
| 398 | return implode( '', $y ); |
| 399 | } |
| 400 | return []; |
| 401 | } |
| 402 | |
| 403 | public function extractIdentifiers( $args = null ) { |
| 404 | if ( $args == null ) { |
| 405 | $args = $this->args; |
| 406 | } |
| 407 | $list = parent::extractIdentifiers( $args ); |
| 408 | $outpos = 0; |
| 409 | $offset = 0; |
| 410 | $int = 0; |
| 411 | |
| 412 | for ( $inpos = 0; $inpos < count( $list ); $inpos++ ) { |
| 413 | $outpos = $inpos - $offset; |
| 414 | switch ( $list[$inpos] ) { |
| 415 | case '\'': |
| 416 | $list[$outpos - 1] .= '\''; |
| 417 | $offset++; |
| 418 | break; |
| 419 | case '\\int': |
| 420 | $int++; |
| 421 | $offset++; |
| 422 | break; |
| 423 | case '\\mathrm{d}': |
| 424 | case 'd': |
| 425 | if ( $int ) { |
| 426 | $int--; |
| 427 | $offset++; |
| 428 | break; |
| 429 | } |
| 430 | // no break |
| 431 | default: |
| 432 | if ( isset( $list[0] ) ) { |
| 433 | $list[$outpos] = $list[$inpos]; |
| 434 | } |
| 435 | } |
| 436 | } |
| 437 | return array_slice( $list, 0, count( $list ) - $offset ); |
| 438 | } |
| 439 | |
| 440 | public function getModIdent() { |
| 441 | $y = []; |
| 442 | |
| 443 | foreach ( $this->args as $x ) { |
| 444 | $y = array_merge( $y, $x->getModIdent() ); |
| 445 | } |
| 446 | |
| 447 | if ( isset( $this->args[0] ) && ( count( $this->args ) == count( $y ) ) ) { |
| 448 | return implode( "", $y ); |
| 449 | } |
| 450 | return []; |
| 451 | } |
| 452 | |
| 453 | public function push( ...$elements ) { |
| 454 | self::checkInput( $elements ); |
| 455 | |
| 456 | array_push( $this->args, ...$elements ); |
| 457 | return $this; |
| 458 | } |
| 459 | |
| 460 | public function pop() { |
| 461 | array_splice( $this->args, 0, 1 ); |
| 462 | } |
| 463 | |
| 464 | /** |
| 465 | * @return TexNode|null first value |
| 466 | */ |
| 467 | public function first() { |
| 468 | return $this->args[0] ?? null; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * @return TexNode|null second value |
| 473 | */ |
| 474 | public function second() { |
| 475 | return $this->args[1] ?? null; |
| 476 | } |
| 477 | |
| 478 | public function unshift( ...$elements ): TexArray { |
| 479 | array_unshift( $this->args, ...$elements ); |
| 480 | return $this; |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * @throws InvalidArgumentException if args not of correct type |
| 485 | * @param TexNode[] $args input args |
| 486 | * @return void |
| 487 | */ |
| 488 | private static function checkInput( $args ): void { |
| 489 | foreach ( $args as $arg ) { |
| 490 | if ( !( $arg instanceof TexNode ) ) { |
| 491 | throw new InvalidArgumentException( 'Wrong input type specified in input elements.' ); |
| 492 | } |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | public function render() { |
| 497 | if ( $this->curly ) { |
| 498 | return $this->inCurlies(); |
| 499 | } |
| 500 | return parent::render(); |
| 501 | } |
| 502 | |
| 503 | public function isCurly(): bool { |
| 504 | return $this->curly; |
| 505 | } |
| 506 | |
| 507 | public function setCurly( $curly = true ): TexArray { |
| 508 | $this->curly = $curly; |
| 509 | return $this; |
| 510 | } |
| 511 | |
| 512 | /** |
| 513 | * @return Generator<TexNode> |
| 514 | */ |
| 515 | public function getIterator(): Generator { |
| 516 | yield from $this->args; |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * @return TexNode[] |
| 521 | */ |
| 522 | public function getArgs(): array { |
| 523 | return parent::getArgs(); |
| 524 | } |
| 525 | |
| 526 | public function offsetExists( $offset ): bool { |
| 527 | return isset( $this->args[$offset] ); |
| 528 | } |
| 529 | |
| 530 | public function offsetGet( $offset ): ?TexNode { |
| 531 | return $this->args[$offset] ?? null; |
| 532 | } |
| 533 | |
| 534 | public function offsetSet( $offset, $value ): void { |
| 535 | if ( !( $value instanceof TexNode ) ) { |
| 536 | throw new InvalidArgumentException( 'TexArray elements must be of type TexNode.' ); |
| 537 | } |
| 538 | $this->args[$offset] = $value; |
| 539 | } |
| 540 | |
| 541 | public function offsetUnset( $offset ): void { |
| 542 | unset( $this->args[$offset] ); |
| 543 | } |
| 544 | |
| 545 | public function setRowSpecs( ?LengthSpec $r ) { |
| 546 | $this->rowSpecs = $r; |
| 547 | } |
| 548 | |
| 549 | public function getRowSpecs(): ?LengthSpec { |
| 550 | return $this->rowSpecs; |
| 551 | } |
| 552 | } |