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| 1 | <?php |
| 2 | /** |
| 3 | * Renders a slot diff by doing a text diff on the native representation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @ingroup DifferenceEngine |
| 22 | */ |
| 23 | |
| 24 | use MediaWiki\Content\Content; |
| 25 | use MediaWiki\Content\TextContent; |
| 26 | use MediaWiki\Context\IContextSource; |
| 27 | use MediaWiki\Context\RequestContext; |
| 28 | use MediaWiki\Diff\TextDiffer\ManifoldTextDiffer; |
| 29 | use MediaWiki\Diff\TextDiffer\TextDiffer; |
| 30 | use MediaWiki\Exception\FatalError; |
| 31 | use MediaWiki\HookContainer\HookContainer; |
| 32 | use MediaWiki\HookContainer\HookRunner; |
| 33 | use MediaWiki\Html\Html; |
| 34 | use MediaWiki\Language\Language; |
| 35 | use MediaWiki\MediaWikiServices; |
| 36 | use MediaWiki\PoolCounter\PoolCounterWorkViaCallback; |
| 37 | use MediaWiki\Status\Status; |
| 38 | use MediaWiki\Title\Title; |
| 39 | use OOUI\ToggleSwitchWidget; |
| 40 | use Wikimedia\Stats\IBufferingStatsdDataFactory; |
| 41 | use Wikimedia\Stats\StatsFactory; |
| 42 | |
| 43 | /** |
| 44 | * Renders a slot diff by doing a text diff on the native representation. |
| 45 | * |
| 46 | * If you want to use this without content objects (to call getTextDiff() on some |
| 47 | * non-content-related texts), obtain an instance with |
| 48 | * ContentHandler::getForModelID( CONTENT_MODEL_TEXT ) |
| 49 | * ->getSlotDiffRenderer( RequestContext::getMain() ) |
| 50 | * |
| 51 | * @ingroup DifferenceEngine |
| 52 | */ |
| 53 | class TextSlotDiffRenderer extends SlotDiffRenderer { |
| 54 | |
| 55 | /** Use the PHP diff implementation (DiffEngine). */ |
| 56 | public const ENGINE_PHP = 'php'; |
| 57 | |
| 58 | /** Use the wikidiff2 PHP module. */ |
| 59 | public const ENGINE_WIKIDIFF2 = 'wikidiff2'; |
| 60 | |
| 61 | /** Use the wikidiff2 PHP module. */ |
| 62 | public const ENGINE_WIKIDIFF2_INLINE = 'wikidiff2inline'; |
| 63 | |
| 64 | /** Use an external executable. */ |
| 65 | public const ENGINE_EXTERNAL = 'external'; |
| 66 | |
| 67 | public const INLINE_LEGEND_KEY = '10_mw-diff-inline-legend'; |
| 68 | |
| 69 | public const INLINE_SWITCHER_KEY = '60_mw-diff-inline-switch'; |
| 70 | |
| 71 | /** @var StatsFactory|null */ |
| 72 | private $statsFactory; |
| 73 | |
| 74 | /** @var HookRunner|null */ |
| 75 | private $hookRunner; |
| 76 | |
| 77 | /** @var string|null */ |
| 78 | private $format; |
| 79 | |
| 80 | /** @var string */ |
| 81 | private $contentModel; |
| 82 | |
| 83 | /** @var TextDiffer|null */ |
| 84 | private $textDiffer; |
| 85 | |
| 86 | /** @var bool */ |
| 87 | private $inlineToggleEnabled = false; |
| 88 | |
| 89 | /** @inheritDoc */ |
| 90 | public function getExtraCacheKeys() { |
| 91 | return $this->textDiffer->getCacheKeys( [ $this->format ] ); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Convenience helper to use getTextDiff without an instance. |
| 96 | * @param string $oldText |
| 97 | * @param string $newText |
| 98 | * @param array $options |
| 99 | * @return string |
| 100 | */ |
| 101 | public static function diff( $oldText, $newText, $options = [] ) { |
| 102 | /** @var TextSlotDiffRenderer $slotDiffRenderer */ |
| 103 | $slotDiffRenderer = MediaWikiServices::getInstance() |
| 104 | ->getContentHandlerFactory() |
| 105 | ->getContentHandler( CONTENT_MODEL_TEXT ) |
| 106 | ->getSlotDiffRenderer( RequestContext::getMain(), $options ); |
| 107 | '@phan-var TextSlotDiffRenderer $slotDiffRenderer'; |
| 108 | return $slotDiffRenderer->getTextDiff( $oldText, $newText ); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * This has no effect since MW 1.43. |
| 113 | * |
| 114 | * @internal Use ContentHandler::createTextSlotDiffRenderer instead |
| 115 | * @param IBufferingStatsdDataFactory $statsdDataFactory |
| 116 | */ |
| 117 | public function setStatsdDataFactory( IBufferingStatsdDataFactory $statsdDataFactory ) { |
| 118 | wfDeprecated( __METHOD__, '1.43' ); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * @internal Use ContentHandler::createTextSlotDiffRenderer instead |
| 123 | * @param StatsFactory $statsFactory |
| 124 | */ |
| 125 | public function setStatsFactory( StatsFactory $statsFactory ) { |
| 126 | $this->statsFactory = $statsFactory; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * This has no effect since MW 1.41. The language is now injected via setTextDiffer(). |
| 131 | * |
| 132 | * @param Language $language |
| 133 | * @deprecated since 1.41 |
| 134 | */ |
| 135 | public function setLanguage( Language $language ) { |
| 136 | wfDeprecated( __METHOD__, '1.41' ); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * @internal Use ContentHandler::createTextSlotDiffRenderer instead |
| 141 | * @since 1.41 |
| 142 | * @param HookContainer $hookContainer |
| 143 | */ |
| 144 | public function setHookContainer( HookContainer $hookContainer ): void { |
| 145 | $this->hookRunner = new HookRunner( $hookContainer ); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * @param string $contentModel |
| 150 | * @since 1.41 |
| 151 | */ |
| 152 | public function setContentModel( string $contentModel ) { |
| 153 | $this->contentModel = $contentModel; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Set which diff engine to use. |
| 158 | * |
| 159 | * @param string $type One of the ENGINE_* constants. |
| 160 | * @param null $executable Must be null since 1.41. Previously a path to execute. |
| 161 | */ |
| 162 | public function setEngine( $type, $executable = null ) { |
| 163 | if ( $executable !== null ) { |
| 164 | throw new \InvalidArgumentException( |
| 165 | 'The $executable parameter is no longer supported and must be null' |
| 166 | ); |
| 167 | } |
| 168 | switch ( $type ) { |
| 169 | case self::ENGINE_PHP: |
| 170 | $engine = 'php'; |
| 171 | $format = 'table'; |
| 172 | break; |
| 173 | |
| 174 | case self::ENGINE_WIKIDIFF2: |
| 175 | $engine = 'wikidiff2'; |
| 176 | $format = 'table'; |
| 177 | break; |
| 178 | |
| 179 | case self::ENGINE_EXTERNAL: |
| 180 | $engine = 'external'; |
| 181 | $format = 'external'; |
| 182 | break; |
| 183 | |
| 184 | case self::ENGINE_WIKIDIFF2_INLINE: |
| 185 | $engine = 'wikidiff2'; |
| 186 | $format = 'inline'; |
| 187 | break; |
| 188 | |
| 189 | default: |
| 190 | throw new \InvalidArgumentException( '$type ' . |
| 191 | 'must be one of the TextSlotDiffRenderer::ENGINE_* constants' ); |
| 192 | } |
| 193 | if ( $this->textDiffer instanceof ManifoldTextDiffer ) { |
| 194 | $this->textDiffer->setEngine( $engine ); |
| 195 | } |
| 196 | $this->setFormat( $format ); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Set the TextDiffer format |
| 201 | * |
| 202 | * @since 1.41 |
| 203 | * @param string $format |
| 204 | */ |
| 205 | public function setFormat( $format ) { |
| 206 | $this->format = $format; |
| 207 | } |
| 208 | |
| 209 | public function setTextDiffer( TextDiffer $textDiffer ) { |
| 210 | $this->textDiffer = $textDiffer; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Get the current TextDiffer, or throw an exception if setTextDiffer() has |
| 215 | * not been called. |
| 216 | */ |
| 217 | private function getTextDiffer(): TextDiffer { |
| 218 | return $this->textDiffer; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Set a flag indicating whether the inline toggle switch is shown. |
| 223 | * |
| 224 | * @since 1.41 |
| 225 | * @param bool $enabled |
| 226 | */ |
| 227 | public function setInlineToggleEnabled( $enabled = true ) { |
| 228 | $this->inlineToggleEnabled = $enabled; |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Get the content model ID that this renderer acts on |
| 233 | * |
| 234 | * @since 1.41 |
| 235 | * @return string |
| 236 | */ |
| 237 | public function getContentModel(): string { |
| 238 | return $this->contentModel; |
| 239 | } |
| 240 | |
| 241 | /** @inheritDoc */ |
| 242 | public function getDiff( ?Content $oldContent = null, ?Content $newContent = null ) { |
| 243 | $this->normalizeContents( $oldContent, $newContent, TextContent::class ); |
| 244 | |
| 245 | $oldText = $oldContent->serialize(); |
| 246 | $newText = $newContent->serialize(); |
| 247 | |
| 248 | return $this->getTextDiff( $oldText, $newText ); |
| 249 | } |
| 250 | |
| 251 | public function localizeDiff( $diff, $options = [] ) { |
| 252 | return $this->textDiffer->localize( $this->format, $diff, $options ); |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * @inheritDoc |
| 257 | */ |
| 258 | public function getTablePrefix( IContextSource $context, Title $newTitle ): array { |
| 259 | $parts = $this->getTextDiffer()->getTablePrefixes( $this->format ); |
| 260 | |
| 261 | $showDiffToggleSwitch = $this->inlineToggleEnabled && $this->getTextDiffer()->hasFormat( 'inline' ); |
| 262 | // If we support the inline type, add a toggle switch |
| 263 | if ( $showDiffToggleSwitch ) { |
| 264 | $values = $context->getRequest()->getQueryValues(); |
| 265 | $isInlineDiffType = $this->format === 'inline'; |
| 266 | $values[ 'diff-type' ] = $isInlineDiffType ? 'table' : 'inline'; |
| 267 | unset( $values[ 'title' ] ); |
| 268 | $parts[self::INLINE_SWITCHER_KEY] = Html::rawElement( 'div', |
| 269 | [ 'class' => 'mw-diffPage-inlineToggle-container' ], |
| 270 | new OOUI\FieldLayout( |
| 271 | new ToggleSwitchWidget( [ |
| 272 | 'id' => 'mw-diffPage-inline-toggle-switch', |
| 273 | 'href' => $newTitle->getLocalURL( $values ), |
| 274 | 'value' => $isInlineDiffType, |
| 275 | 'title' => $context->msg( 'diff-inline-switch-desc' )->plain() |
| 276 | ] ), |
| 277 | [ |
| 278 | 'id' => 'mw-diffPage-inline-toggle-switch-layout', |
| 279 | 'label' => $context->msg( 'diff-inline-format-label' )->plain(), |
| 280 | 'infusable' => true, |
| 281 | 'title' => $context->msg( 'diff-inline-switch-desc' )->plain() |
| 282 | ] |
| 283 | ), |
| 284 | ); |
| 285 | } |
| 286 | // Add an empty placeholder for the legend is added when it's not in |
| 287 | // use and other items have been added. |
| 288 | $parts += [ self::INLINE_LEGEND_KEY => null, self::INLINE_SWITCHER_KEY => null ]; |
| 289 | |
| 290 | // Allow extensions to add other parts to this area (or modify the legend). |
| 291 | $this->hookRunner->onTextSlotDiffRendererTablePrefix( $this, $context, $parts ); |
| 292 | if ( count( $parts ) > 1 && $parts[self::INLINE_LEGEND_KEY] === null ) { |
| 293 | $parts[self::INLINE_LEGEND_KEY] = Html::element( 'div' ); |
| 294 | } |
| 295 | return $parts; |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Diff the text representations of two content objects (or just two pieces of text in general). |
| 300 | * @param string $oldText |
| 301 | * @param string $newText |
| 302 | * @return string HTML. One or more <tr> tags, or an empty string if the inputs are identical. |
| 303 | */ |
| 304 | public function getTextDiff( string $oldText, string $newText ) { |
| 305 | $diff = function () use ( $oldText, $newText ) { |
| 306 | $time = microtime( true ); |
| 307 | |
| 308 | $result = $this->getTextDiffInternal( $oldText, $newText ); |
| 309 | |
| 310 | $time = intval( ( microtime( true ) - $time ) * 1000 ); |
| 311 | |
| 312 | if ( $this->statsFactory ) { |
| 313 | $this->statsFactory->getTiming( 'diff_text_seconds' ) |
| 314 | ->copyToStatsdAt( 'diff_time' ) |
| 315 | ->observe( $time ); |
| 316 | } |
| 317 | |
| 318 | return $result; |
| 319 | }; |
| 320 | |
| 321 | /** |
| 322 | * @param Status $status |
| 323 | * @throws FatalError |
| 324 | * @return never |
| 325 | */ |
| 326 | $error = static function ( $status ) { |
| 327 | throw new FatalError( $status->getWikiText() ); |
| 328 | }; |
| 329 | |
| 330 | // Use PoolCounter if the diff looks like it can be expensive |
| 331 | if ( strlen( $oldText ) + strlen( $newText ) > 20000 ) { |
| 332 | $work = new PoolCounterWorkViaCallback( 'diff', |
| 333 | md5( $oldText ) . md5( $newText ), |
| 334 | [ 'doWork' => $diff, 'error' => $error ] |
| 335 | ); |
| 336 | return $work->execute(); |
| 337 | } |
| 338 | |
| 339 | return $diff(); |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * Diff the text representations of two content objects (or just two pieces of text in general). |
| 344 | * This does the actual diffing, getTextDiff() wraps it with logging and resource limiting. |
| 345 | * @param string $oldText |
| 346 | * @param string $newText |
| 347 | * @return string |
| 348 | * @throws Exception |
| 349 | */ |
| 350 | protected function getTextDiffInternal( $oldText, $newText ) { |
| 351 | $oldText = str_replace( "\r\n", "\n", $oldText ); |
| 352 | $newText = str_replace( "\r\n", "\n", $newText ); |
| 353 | |
| 354 | if ( $oldText === $newText ) { |
| 355 | return ''; |
| 356 | } |
| 357 | |
| 358 | $textDiffer = $this->getTextDiffer(); |
| 359 | $diffText = $textDiffer->render( $oldText, $newText, $this->format ); |
| 360 | return $textDiffer->addRowWrapper( $this->format, $diffText ); |
| 361 | } |
| 362 | |
| 363 | } |