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1 |
1 | <?php |
2 | /** |
3 | * MediaWiki math extension |
4 | * |
5 | * @copyright 2002-2015 various MediaWiki contributors |
6 | * @license GPL-2.0-or-later |
7 | */ |
8 | |
9 | namespace MediaWiki\Extension\Math; |
10 | |
11 | use MediaWiki\Extension\Math\Hooks\HookRunner; |
12 | use MediaWiki\Html\Html; |
13 | use MediaWiki\Logger\LoggerFactory; |
14 | use MediaWiki\MediaWikiServices; |
15 | use MediaWiki\SpecialPage\SpecialPage; |
16 | use MediaWiki\Title\Title; |
17 | use Psr\Log\LoggerInterface; |
18 | use StatusValue; |
19 | use stdClass; |
20 | use Throwable; |
21 | use Xml; |
22 | use XmlTypeCheck; |
23 | |
24 | /** |
25 | * Converts LaTeX to MathML using the mathoid-server |
26 | */ |
27 | class MathMathML extends MathRenderer { |
28 | |
29 | /** @var string[] */ |
30 | protected $defaultAllowedRootElements = [ 'math' ]; |
31 | /** @var string[] */ |
32 | protected $restbaseInputTypes = [ 'tex', 'inline-tex', 'chem' ]; |
33 | /** @var string[] */ |
34 | protected $restbaseRenderingModes = [ MathConfig::MODE_MATHML ]; |
35 | /** @var string[] */ |
36 | protected $allowedRootElements = []; |
37 | /** @var string */ |
38 | protected $host; |
39 | |
40 | /** @var LoggerInterface */ |
41 | protected $logger; |
42 | |
43 | /** @var bool if false MathML output is not validated */ |
44 | private $XMLValidation = true; |
45 | |
46 | /** |
47 | * @var string|bool |
48 | */ |
49 | private $svgPath = false; |
50 | |
51 | /** @var string|null */ |
52 | private $mathoidStyle; |
53 | |
54 | public function __construct( string $tex = '', array $params = [], $cache = null ) { |
55 | global $wgMathMathMLUrl; |
56 | parent::__construct( $tex, $params, $cache ); |
57 | $this->setMode( MathConfig::MODE_MATHML ); |
58 | $this->host = $wgMathMathMLUrl; |
59 | if ( isset( $params['type'] ) ) { |
60 | $allowedTypes = [ 'pmml', 'ascii', 'chem' ]; |
61 | if ( in_array( $params['type'], $allowedTypes, true ) ) { |
62 | $this->inputType = $params['type']; |
63 | } |
64 | if ( $params['type'] == 'pmml' ) { |
65 | $this->setMathml( '<math>' . $tex . '</math>' ); |
66 | } |
67 | } |
68 | if ( !isset( $params['display'] ) && $this->getMathStyle() == 'inlineDisplaystyle' ) { |
69 | // default preserve the (broken) layout as it was |
70 | $this->tex = '{\\displaystyle ' . $tex . '}'; |
71 | } |
72 | $this->logger = LoggerFactory::getInstance( 'Math' ); |
73 | } |
74 | |
75 | /** |
76 | * @inheritDoc |
77 | */ |
78 | public function addTrackingCategories( $parser ) { |
79 | parent::addTrackingCategories( $parser ); |
80 | if ( $this->hasWarnings() ) { |
81 | foreach ( $this->warnings as $warning ) { |
82 | if ( isset( $warning->type ) ) { |
83 | switch ( $warning->type ) { |
84 | case 'mhchem-deprecation': |
85 | $parser->addTrackingCategory( 'math-tracking-category-mhchem-deprecation' ); |
86 | break; |
87 | case 'texvc-deprecation': |
88 | $parser->addTrackingCategory( 'math-tracking-category-texvc-deprecation' ); |
89 | } |
90 | } |
91 | } |
92 | } |
93 | } |
94 | |
95 | /** |
96 | * @param MathRenderer[] $renderers |
97 | */ |
98 | public static function batchEvaluate( array $renderers ) { |
99 | $rbis = []; |
100 | foreach ( $renderers as $renderer ) { |
101 | $rbi = new MathRestbaseInterface( $renderer->getTex(), $renderer->getInputType() ); |
102 | $renderer->setRestbaseInterface( $rbi ); |
103 | $rbis[] = $rbi; |
104 | } |
105 | MathRestbaseInterface::batchEvaluate( $rbis ); |
106 | } |
107 | |
108 | /** |
109 | * Gets the allowed root elements the rendered math tag might have. |
110 | * |
111 | * @return string[] |
112 | */ |
113 | public function getAllowedRootElements() { |
114 | if ( $this->allowedRootElements ) { |
115 | return $this->allowedRootElements; |
116 | } else { |
117 | return $this->defaultAllowedRootElements; |
118 | } |
119 | } |
120 | |
121 | /** |
122 | * Sets the XML validation. |
123 | * If set to false the output of MathML is not validated. |
124 | * @param bool $validation |
125 | */ |
126 | public function setXMLValidation( $validation = true ) { |
127 | $this->XMLValidation = $validation; |
128 | } |
129 | |
130 | /** |
131 | * Sets the allowed root elements the rendered math tag might have. |
132 | * An empty value indicates to use the default settings. |
133 | * @param string[] $settings |
134 | */ |
135 | public function setAllowedRootElements( $settings ) { |
136 | $this->allowedRootElements = $settings; |
137 | } |
138 | |
139 | public function render() { |
140 | global $wgMathFullRestbaseURL; |
141 | try { |
142 | if ( in_array( $this->inputType, $this->restbaseInputTypes, true ) && |
143 | in_array( $this->mode, $this->restbaseRenderingModes, true ) |
144 | ) { |
145 | if ( !$this->rbi ) { |
146 | $this->rbi = |
147 | new MathRestbaseInterface( $this->getTex(), $this->getInputType() ); |
148 | $this->rbi->setPurge( $this->isPurge() ); |
149 | } |
150 | $rbi = $this->rbi; |
151 | if ( $rbi->getSuccess() ) { |
152 | $this->mathml = $rbi->getMathML(); |
153 | $this->mathoidStyle = $rbi->getMathoidStyle(); |
154 | $this->svgPath = $rbi->getFullSvgUrl(); |
155 | $this->warnings = $rbi->getWarnings(); |
156 | } elseif ( $this->lastError === '' ) { |
157 | $this->doCheck(); |
158 | } |
159 | $this->changed = false; |
160 | return $rbi->getSuccess(); |
161 | } |
162 | if ( $this->renderingRequired() ) { |
163 | $renderResult = $this->doRender(); |
164 | if ( !$renderResult->isGood() ) { |
165 | // TODO: this is a hacky hack, lastError will not exist soon. |
166 | $renderError = $renderResult->getErrors()[0]; |
167 | $this->lastError = $this->getError( $renderError['message'], ...$renderError['params'] ); |
168 | } |
169 | return $renderResult->isGood(); |
170 | } |
171 | return true; |
172 | } catch ( Throwable $e ) { |
173 | $this->lastError = $this->getError( 'math_mathoid_error', |
174 | $wgMathFullRestbaseURL, $e->getMessage() ); |
175 | $this->logger->error( $e->getMessage(), [ $e, $this ] ); |
176 | return false; |
177 | } |
178 | } |
179 | |
180 | /** |
181 | * Helper function to checks if the math tag must be rendered. |
182 | * @return bool |
183 | */ |
184 | private function renderingRequired() { |
185 | if ( $this->isPurge() ) { |
186 | $this->logger->debug( 'Rerendering was requested.' ); |
187 | return true; |
188 | } |
189 | |
190 | $dbres = $this->isInDatabase(); |
191 | if ( $dbres ) { |
192 | if ( $this->isValidMathML( $this->getMathml() ) ) { |
193 | $this->logger->debug( 'Valid MathML entry found in database.' ); |
194 | if ( $this->getSvg( 'cached' ) ) { |
195 | $this->logger->debug( 'SVG-fallback found in database.' ); |
196 | return false; |
197 | } else { |
198 | $this->logger->debug( 'SVG-fallback missing.' ); |
199 | return true; |
200 | } |
201 | } else { |
202 | $this->logger->debug( 'Malformatted entry found in database' ); |
203 | return true; |
204 | } |
205 | } else { |
206 | $this->logger->debug( 'No entry found in database.' ); |
207 | return true; |
208 | } |
209 | } |
210 | |
211 | /** |
212 | * Performs a HTTP Post request to the given host. |
213 | * Uses $wgMathLaTeXMLTimeout as timeout. |
214 | * |
215 | * @return StatusValue result with response body as a value |
216 | */ |
217 | public function makeRequest() { |
218 | // TODO: Change the timeout mechanism. |
219 | global $wgMathLaTeXMLTimeout; |
220 | $post = $this->getPostData(); |
221 | $options = [ 'method' => 'POST', 'postData' => $post, 'timeout' => $wgMathLaTeXMLTimeout ]; |
222 | $req = MediaWikiServices::getInstance()->getHttpRequestFactory()->create( $this->host, $options ); |
223 | $status = $req->execute(); |
224 | if ( $status->isGood() ) { |
225 | return StatusValue::newGood( $req->getContent() ); |
226 | } else { |
227 | if ( $status->hasMessage( 'http-timed-out' ) ) { |
228 | $this->logger->warning( 'Math service request timeout', [ |
229 | 'post' => $post, |
230 | 'host' => $this->host, |
231 | 'timeout' => $wgMathLaTeXMLTimeout |
232 | ] ); |
233 | return StatusValue::newFatal( 'math_timeout', $this->getModeName(), $this->host ); |
234 | } else { |
235 | $errormsg = $req->getContent(); |
236 | $this->logger->warning( 'Math service request failed', [ |
237 | 'post' => $post, |
238 | 'host' => $this->host, |
239 | 'errormsg' => $errormsg |
240 | ] ); |
241 | return StatusValue::newFatal( |
242 | 'math_invalidresponse', |
243 | $this->getModeName(), |
244 | $this->host, |
245 | $errormsg, |
246 | $this->getModeName() |
247 | ); |
248 | } |
249 | } |
250 | } |
251 | |
252 | /** |
253 | * Calculates the HTTP POST Data for the request. Depends on the settings |
254 | * and the input string only. |
255 | * @return string HTTP POST data |
256 | */ |
257 | public function getPostData() { |
258 | $input = $this->getTex(); |
259 | if ( $this->inputType == 'pmml' || |
260 | ( $this->getMode() == MathConfig::MODE_LATEXML && $this->getMathml() ) |
261 | ) { |
262 | $out = 'type=mml&q=' . rawurlencode( $this->getMathml() ); |
263 | } elseif ( $this->inputType == 'ascii' ) { |
264 | $out = 'type=asciimath&q=' . rawurlencode( $input ); |
265 | } else { |
266 | if ( $this->getMathStyle() === 'inlineDisplaystyle' ) { |
267 | // default preserve the (broken) layout as it was |
268 | $out = 'type=inline-TeX&q=' . rawurlencode( '{\\displaystyle ' . $input . '}' ); |
269 | } elseif ( $this->getMathStyle() === 'inline' ) { |
270 | $out = 'type=inline-TeX&q=' . rawurlencode( $input ); |
271 | } else { |
272 | $out = 'type=tex&q=' . rawurlencode( $input ); |
273 | } |
274 | } |
275 | $this->logger->debug( 'Get post data: ' . $out ); |
276 | return $out; |
277 | } |
278 | |
279 | /** |
280 | * Does the actual web request to convert TeX to MathML. |
281 | * |
282 | * @return StatusValue |
283 | */ |
284 | protected function doRender(): StatusValue { |
285 | if ( $this->isEmpty() ) { |
286 | $this->logger->debug( 'Rendering was requested, but no TeX string is specified.' ); |
287 | return StatusValue::newFatal( 'math_empty_tex' ); |
288 | } |
289 | $requestStatus = $this->makeRequest(); |
290 | if ( $requestStatus->isGood() ) { |
291 | $jsonResult = json_decode( $requestStatus->getValue() ); |
292 | if ( $jsonResult && json_last_error() === JSON_ERROR_NONE ) { |
293 | if ( $jsonResult->success ) { |
294 | return $this->processJsonResult( $jsonResult, $this->host ); |
295 | } else { |
296 | $serviceLog = $jsonResult->log ?? wfMessage( 'math_unknown_error' ) |
297 | ->inContentLanguage() |
298 | ->escaped(); |
299 | $this->logger->warning( 'Mathoid conversion error', [ |
300 | 'post' => $this->getPostData(), |
301 | 'host' => $this->host, |
302 | 'result' => $requestStatus->getValue(), |
303 | 'service_log' => $serviceLog |
304 | ] ); |
305 | return StatusValue::newFatal( 'math_mathoid_error', $this->host, $serviceLog ); |
306 | } |
307 | } else { |
308 | $this->logger->error( 'MathML invalid JSON', [ |
309 | 'post' => $this->getPostData(), |
310 | 'host' => $this->host, |
311 | 'res' => $requestStatus->getValue(), |
312 | ] ); |
313 | return StatusValue::newFatal( 'math_invalidjson', $this->host ); |
314 | } |
315 | } else { |
316 | return $requestStatus; |
317 | } |
318 | } |
319 | |
320 | /** |
321 | * Checks if the input is valid MathML, |
322 | * and if the root element has the name math |
323 | * @param string $XML |
324 | * @return bool |
325 | */ |
326 | public function isValidMathML( $XML ) { |
327 | $out = false; |
328 | if ( !$this->XMLValidation ) { |
329 | return true; |
330 | } |
331 | |
332 | $xmlObject = new XmlTypeCheck( $XML, null, false ); |
333 | if ( !$xmlObject->wellFormed ) { |
334 | $this->logger->error( |
335 | 'XML validation error: ' . var_export( $XML, true ) ); |
336 | } else { |
337 | $name = $xmlObject->getRootElement(); |
338 | $elementSplit = explode( ':', $name ); |
339 | $localName = end( $elementSplit ); |
340 | if ( in_array( $localName, $this->getAllowedRootElements(), true ) ) { |
341 | $out = true; |
342 | } else { |
343 | $this->logger->error( "Got wrong root element: $name" ); |
344 | } |
345 | } |
346 | return $out; |
347 | } |
348 | |
349 | /** |
350 | * @param bool $noRender |
351 | * @return Title|string |
352 | */ |
353 | private function getFallbackImageUrl( $noRender = false ) { |
354 | if ( $this->svgPath ) { |
355 | return $this->svgPath; |
356 | } |
357 | return SpecialPage::getTitleFor( 'MathShowImage' )->getLocalURL( [ |
358 | 'hash' => $this->getInputHash(), |
359 | 'mode' => $this->getMode(), |
360 | 'noRender' => $noRender |
361 | ] |
362 | ); |
363 | } |
364 | |
365 | /** |
366 | * Helper function to correct the style information for a |
367 | * linked SVG image. |
368 | * @param string &$style current style information to be updated |
369 | */ |
370 | public function correctSvgStyle( &$style ) { |
371 | if ( preg_match( '/style="([^"]*)"/', $this->getSvg(), $styles ) ) { |
372 | $style .= ' ' . $styles[1]; // merge styles |
373 | if ( $this->getMathStyle() === 'display' ) { |
374 | // TODO: Improve style cleaning |
375 | $style = preg_replace( |
376 | '/margin\-(left|right)\:\s*\d+(\%|in|cm|mm|em|ex|pt|pc|px)\;/', '', $style |
377 | ); |
378 | } |
379 | $style = trim( preg_replace( '/position:\s*absolute;\s*left:\s*0px;/', '', $style ), |
380 | "; \t\n\r\0\x0B" ) . '; '; |
381 | |
382 | } |
383 | // TODO: Figure out if there is a way to construct |
384 | // a SVGReader from a string that represents the SVG |
385 | // content |
386 | if ( preg_match( "/height=\"(.*?)\"/", $this->getSvg(), $matches ) ) { |
387 | $style .= 'height: ' . $matches[1] . '; '; |
388 | } |
389 | if ( preg_match( "/width=\"(.*?)\"/", $this->getSvg(), $matches ) ) { |
390 | $style .= 'width: ' . $matches[1] . ';'; |
391 | } |
392 | } |
393 | |
394 | /** |
395 | * Gets img tag for math image |
396 | * @param bool $noRender if true no rendering will be performed |
397 | * if the image is not stored in the database |
398 | * @param false|string $classOverride if classOverride |
399 | * is false the class name will be calculated by getClassName |
400 | * @return string XML the image html tag |
401 | */ |
402 | protected function getFallbackImage( $noRender = false, $classOverride = false ) { |
403 | $attribs = [ |
404 | 'src' => $this->getFallbackImageUrl( $noRender ), |
405 | 'class' => $classOverride === false ? $this->getClassName( true ) : $classOverride, |
406 | ]; |
407 | if ( !$this->mathoidStyle ) { |
408 | $this->correctSvgStyle( $this->mathoidStyle ); |
409 | } |
410 | |
411 | return Html::element( 'img', $this->getAttributes( 'span', $attribs, [ |
412 | 'aria-hidden' => 'true', |
413 | 'style' => $this->mathoidStyle, |
414 | 'alt' => $this->tex |
415 | ] ) ); |
416 | } |
417 | |
418 | /** |
419 | * @return string |
420 | */ |
421 | protected function getMathTableName() { |
422 | return 'mathoid'; |
423 | } |
424 | |
425 | /** |
426 | * Calculates the default class name for a math element |
427 | * @param bool $fallback |
428 | * @return string the class name |
429 | */ |
430 | private function getClassName( $fallback = false ) { |
431 | $class = 'mwe-math-'; |
432 | if ( $fallback ) { |
433 | $class .= 'fallback-image-'; |
434 | } else { |
435 | $class .= 'mathml-'; |
436 | } |
437 | if ( $this->getMathStyle() == 'display' ) { |
438 | $class .= 'display'; |
439 | } else { |
440 | $class .= 'inline'; |
441 | } |
442 | if ( $fallback ) { |
443 | $class .= ' mw-invert'; |
444 | } else { |
445 | $class .= ' mwe-math-mathml-a11y'; |
446 | } |
447 | return $class; |
448 | } |
449 | |
450 | /** |
451 | * @return string Html output that is embedded in the page |
452 | */ |
453 | public function getHtmlOutput() { |
454 | $config = MediaWikiServices::getInstance()->getMainConfig(); |
455 | $enableLinks = $config->get( "MathEnableFormulaLinks" ); |
456 | if ( $this->getMathStyle() == 'display' ) { |
457 | $element = 'div'; |
458 | } else { |
459 | $element = 'span'; |
460 | } |
461 | $attribs = [ 'class' => 'mwe-math-element' ]; |
462 | if ( $this->getID() !== '' ) { |
463 | $attribs['id'] = $this->getID(); |
464 | } |
465 | $hyperlink = null; |
466 | if ( isset( $this->params['qid'] ) && preg_match( '/Q\d+/', $this->params['qid'] ) ) { |
467 | $attribs['data-qid'] = $this->params['qid']; |
468 | $titleObj = SpecialPage::getTitleFor( 'MathWikibase' ); |
469 | $hyperlink = $titleObj->getLocalURL( [ 'qid' => $this->params['qid'] ] ); |
470 | } |
471 | $output = Html::openElement( $element, $attribs ); |
472 | if ( $hyperlink && $enableLinks ) { |
473 | $output .= Html::openElement( 'a', [ 'href' => $hyperlink, 'style' => 'color:inherit;' ] ); |
474 | } |
475 | // MathML has to be wrapped into a div or span in order to be able to hide it. |
476 | // Remove displayStyle attributes set by the MathML converter |
477 | // (Beginning from Mathoid 0.2.5 block is the default layout.) |
478 | $mml = preg_replace( |
479 | '/(<math[^>]*)(display|mode)=["\'](inline|block)["\']/', '$1', $this->getMathml() |
480 | ); |
481 | if ( $this->getMathStyle() == 'display' ) { |
482 | $mml = preg_replace( '/<math/', '<math display="block"', $mml ); |
483 | } |
484 | $output .= Xml::tags( $element, [ |
485 | 'class' => $this->getClassName(), 'style' => 'display: none;' |
486 | ], $mml ); |
487 | $output .= $this->getFallbackImage(); |
488 | if ( $hyperlink && $enableLinks ) { |
489 | $output .= Html::closeElement( 'a' ); |
490 | } |
491 | $output .= Html::closeElement( $element ); |
492 | return $output; |
493 | } |
494 | |
495 | protected function dbOutArray() { |
496 | $out = parent::dbOutArray(); |
497 | if ( $this->getMathTableName() === 'mathoid' ) { |
498 | $out['math_input'] = $out['math_inputtex']; |
499 | unset( $out['math_inputtex'] ); |
500 | } |
501 | return $out; |
502 | } |
503 | |
504 | protected function dbInArray() { |
505 | $out = parent::dbInArray(); |
506 | if ( $this->getMathTableName() === 'mathoid' ) { |
507 | $out = array_diff( $out, [ 'math_inputtex' ] ); |
508 | $out[] = 'math_input'; |
509 | } |
510 | return $out; |
511 | } |
512 | |
513 | public function initializeFromCache( $rpage ) { |
514 | // mathoid allows different input formats |
515 | // therefore the column name math_inputtex was changed to math_input |
516 | if ( $this->getMathTableName() === 'mathoid' && isset( $rpage['math_input'] ) ) { |
517 | $this->userInputTex = $rpage['math_input']; |
518 | } |
519 | parent::initializeFromCache( $rpage ); |
520 | } |
521 | |
522 | /** |
523 | * @param stdClass $jsonResult |
524 | * @param string $host name |
525 | * |
526 | * @return StatusValue |
527 | */ |
528 | protected function processJsonResult( $jsonResult, $host ): StatusValue { |
529 | if ( $this->getMode() == MathConfig::MODE_LATEXML || $this->inputType == 'pmml' || |
530 | $this->isValidMathML( $jsonResult->mml ) |
531 | ) { |
532 | if ( isset( $jsonResult->svg ) ) { |
533 | $xmlObject = new XmlTypeCheck( $jsonResult->svg, null, false ); |
534 | if ( !$xmlObject->wellFormed ) { |
535 | return StatusValue::newFatal( 'math_invalidxml', $host ); |
536 | } else { |
537 | $this->setSvg( $jsonResult->svg ); |
538 | } |
539 | } else { |
540 | $this->logger->error( 'Missing SVG property in JSON result.' ); |
541 | } |
542 | if ( $this->getMode() != MathConfig::MODE_LATEXML && $this->inputType != 'pmml' ) { |
543 | $this->setMathml( $jsonResult->mml ); |
544 | } |
545 | // Avoid PHP 7.1 warning from passing $this by reference |
546 | $renderer = $this; |
547 | ( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )->onMathRenderingResultRetrieved( |
548 | $renderer, $jsonResult |
549 | ); // Enables debugging of server results |
550 | return StatusValue::newGood(); // FIXME: empty? |
551 | } else { |
552 | return StatusValue::newFatal( 'math_unknown_error', $host ); |
553 | } |
554 | } |
555 | |
556 | /** |
557 | * @return bool |
558 | */ |
559 | protected function isEmpty() { |
560 | return $this->userInputTex === ''; |
561 | } |
562 | } |