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| 1 | <?php |
| 2 | |
| 3 | use HtmlFormatter\HtmlFormatter; |
| 4 | use MediaWiki\Parser\ParserOutput; |
| 5 | use MediaWiki\Parser\Sanitizer; |
| 6 | |
| 7 | /** |
| 8 | * Class allowing to explore the structure of parsed wikitext. |
| 9 | */ |
| 10 | class WikiTextStructure { |
| 11 | |
| 12 | private ?string $openingText = null; |
| 13 | private ?string $allText = null; |
| 14 | /** @var string[] */ |
| 15 | private array $auxText = []; |
| 16 | private ParserOutput $parserOutput; |
| 17 | |
| 18 | /** |
| 19 | * Selectors to elements that are excluded entirely from search |
| 20 | */ |
| 21 | private const EXCLUDED_ELEMENT_SELECTORS = [ |
| 22 | // "it looks like you don't have javascript enabled..." – do not need to index |
| 23 | 'audio', 'video', |
| 24 | // CSS stylesheets aren't content |
| 25 | 'style', |
| 26 | // The [1] for references from Cite |
| 27 | 'sup.reference', |
| 28 | // The ↑ next to references in the references section from Cite |
| 29 | '.mw-cite-backlink', |
| 30 | // Headings are already indexed in their own field. |
| 31 | 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', |
| 32 | // Collapsed fields are hidden by default, so we don't want them showing up. |
| 33 | '.autocollapse', |
| 34 | // Content explicitly decided to be not searchable by editors such |
| 35 | // as custom navigation templates. |
| 36 | '.navigation-not-searchable', |
| 37 | // User-facing interface code prompting the user to act from WikibaseMediaInfo |
| 38 | '.wbmi-entityview-emptyCaption', |
| 39 | ]; |
| 40 | |
| 41 | /** |
| 42 | * Selectors to elements that are considered auxiliary to the article text for search |
| 43 | */ |
| 44 | private const AUXILIARY_ELEMENT_SELECTORS = [ |
| 45 | // Thumbnail captions aren't really part of the text proper |
| 46 | '.thumbcaption', |
| 47 | 'figcaption', |
| 48 | // Neither are tables |
| 49 | 'table', |
| 50 | // Common style for "See also:". |
| 51 | '.rellink', |
| 52 | // Common style for calling out helpful links at the top of the article. |
| 53 | '.dablink', |
| 54 | // New class users can use to mark stuff as auxiliary to searches. |
| 55 | '.searchaux', |
| 56 | ]; |
| 57 | |
| 58 | /** |
| 59 | * @param ParserOutput $parserOutput |
| 60 | */ |
| 61 | public function __construct( ParserOutput $parserOutput ) { |
| 62 | $this->parserOutput = $parserOutput; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Gets headings from the page. |
| 67 | * @return string[] |
| 68 | * First strip out things that look like references. We can't use HTML filtering because |
| 69 | * the references come back as <sup> tags without a class. To keep from breaking stuff like |
| 70 | * ==Applicability of the strict mass–energy equivalence formula, ''E'' = ''mc''<sup>2</sup>== |
| 71 | * we don't remove the whole <sup> tag. |
| 72 | * |
| 73 | * We also don't want to strip the <sup> tag and remove everything that looks like [2] because, |
| 74 | * I don't know, maybe there is a band named Word [2] Foo r something. Whatever. |
| 75 | * |
| 76 | * So we only strip things that look like <sup> tags wrapping a reference. And since the data |
| 77 | * looks like: |
| 78 | * Reference in heading <sup>[1]</sup><sup>[2]</sup> |
| 79 | * we can not really use HtmlFormatter as we have no suitable selector. |
| 80 | */ |
| 81 | public function headings() { |
| 82 | $headings = []; |
| 83 | $tocData = $this->parserOutput->getTOCData(); |
| 84 | if ( $tocData === null ) { |
| 85 | return $headings; |
| 86 | } |
| 87 | $ignoredHeadings = $this->getIgnoredHeadings(); |
| 88 | foreach ( $tocData->getSections() as $heading ) { |
| 89 | $heading = $heading->line; |
| 90 | |
| 91 | // Some wikis wrap the brackets in a span: |
| 92 | // https://en.wikipedia.org/wiki/MediaWiki:Cite_reference_link |
| 93 | $heading = preg_replace( '/<\/?span>/', '', $heading ); |
| 94 | // Normalize [] so the following regexp would work. |
| 95 | $heading = preg_replace( [ '/[/', '/]/' ], [ '[', ']' ], $heading ); |
| 96 | $heading = preg_replace( '/<sup>\s*\[\s*\d+\s*\]\s*<\/sup>/i', '', $heading ); |
| 97 | |
| 98 | // Strip tags from the heading or else we'll display them (escaped) in search results |
| 99 | $heading = trim( Sanitizer::stripAllTags( $heading ) ); |
| 100 | |
| 101 | // Note that we don't take the level of the heading into account - all headings are equal. |
| 102 | // Except the ones we ignore. |
| 103 | if ( !in_array( $heading, $ignoredHeadings ) ) { |
| 104 | $headings[] = $heading; |
| 105 | } |
| 106 | } |
| 107 | return $headings; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Parse a message content into an array. This function is generally used to |
| 112 | * parse settings stored as i18n messages (see search-ignored-headings). |
| 113 | * |
| 114 | * @param string $message |
| 115 | * @return string[] |
| 116 | */ |
| 117 | public static function parseSettingsInMessage( $message ) { |
| 118 | $lines = explode( "\n", $message ); |
| 119 | // Remove comments |
| 120 | $lines = preg_replace( '/#.*$/', '', $lines ); |
| 121 | // Remove extra spaces |
| 122 | $lines = array_map( 'trim', $lines ); |
| 123 | // Remove empty lines |
| 124 | return array_filter( $lines ); |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Gets a list of heading to ignore. |
| 129 | * @return string[] |
| 130 | */ |
| 131 | private function getIgnoredHeadings() { |
| 132 | static $ignoredHeadings = null; |
| 133 | if ( $ignoredHeadings === null ) { |
| 134 | $ignoredHeadings = []; |
| 135 | $source = wfMessage( 'search-ignored-headings' )->inContentLanguage(); |
| 136 | if ( $source->isBlank() ) { |
| 137 | // Try the old version too, just in case |
| 138 | $source = wfMessage( 'cirrussearch-ignored-headings' )->inContentLanguage(); |
| 139 | } |
| 140 | if ( !$source->isDisabled() ) { |
| 141 | $lines = self::parseSettingsInMessage( $source->plain() ); |
| 142 | // Now we just have headings! |
| 143 | $ignoredHeadings = $lines; |
| 144 | } |
| 145 | } |
| 146 | return $ignoredHeadings; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Extract parts of the text - opening, main and auxiliary. |
| 151 | */ |
| 152 | private function extractWikitextParts() { |
| 153 | if ( $this->allText !== null ) { |
| 154 | return; |
| 155 | } |
| 156 | $text = $this->parserOutput->getRawText(); |
| 157 | if ( $text === '' ) { |
| 158 | $this->allText = ""; |
| 159 | // empty text - nothing to seek here |
| 160 | return; |
| 161 | } |
| 162 | |
| 163 | $this->openingText = $this->extractTextBeforeFirstHeading( $text ); |
| 164 | |
| 165 | $formatter = new HtmlFormatter( $text ); |
| 166 | |
| 167 | // Strip elements from the page that we never want in the search text. |
| 168 | $formatter->remove( self::EXCLUDED_ELEMENT_SELECTORS ); |
| 169 | $formatter->filterContent(); |
| 170 | |
| 171 | // Strip elements from the page that are auxiliary text. These will still be |
| 172 | // searched, but matches will be ranked lower and non-auxiliary matches will be |
| 173 | // preferred in highlighting. |
| 174 | $formatter->remove( self::AUXILIARY_ELEMENT_SELECTORS ); |
| 175 | $auxiliaryElements = $formatter->filterContent(); |
| 176 | $this->allText = trim( Sanitizer::stripAllTags( $formatter->getText() ) ); |
| 177 | foreach ( $auxiliaryElements as $auxiliaryElement ) { |
| 178 | $this->auxText[] = |
| 179 | trim( Sanitizer::stripAllTags( $formatter->getText( $auxiliaryElement ) ) ); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Get text before first heading. |
| 185 | * @param string $text |
| 186 | * @return string|null |
| 187 | */ |
| 188 | private function extractTextBeforeFirstHeading( $text ) { |
| 189 | $matches = []; |
| 190 | if ( !preg_match( '/<h[123456]\b/', $text, $matches, PREG_OFFSET_CAPTURE ) ) { |
| 191 | // There isn't a first heading, so we interpret this as the article |
| 192 | // being entirely without heading. |
| 193 | return null; |
| 194 | } |
| 195 | $text = substr( $text, 0, $matches[ 0 ][ 1 ] ); |
| 196 | if ( !$text ) { |
| 197 | // There isn't any text before the first heading, so we declare there isn't |
| 198 | // a first heading. |
| 199 | return null; |
| 200 | } |
| 201 | |
| 202 | $formatter = new HtmlFormatter( $text ); |
| 203 | $formatter->remove( self::EXCLUDED_ELEMENT_SELECTORS ); |
| 204 | $formatter->remove( self::AUXILIARY_ELEMENT_SELECTORS ); |
| 205 | $formatter->filterContent(); |
| 206 | $text = trim( Sanitizer::stripAllTags( $formatter->getText() ) ); |
| 207 | |
| 208 | if ( !$text ) { |
| 209 | // There isn't any text after filtering before the first heading, so we declare |
| 210 | // that there isn't a first heading. |
| 211 | return null; |
| 212 | } |
| 213 | |
| 214 | return $text; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * @return string|null |
| 219 | */ |
| 220 | public function getOpeningText() { |
| 221 | $this->extractWikitextParts(); |
| 222 | return $this->openingText; |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * @return string |
| 227 | */ |
| 228 | public function getMainText() { |
| 229 | $this->extractWikitextParts(); |
| 230 | return $this->allText; |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * @return string[] |
| 235 | */ |
| 236 | public function getAuxiliaryText() { |
| 237 | $this->extractWikitextParts(); |
| 238 | return $this->auxText; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Get the "defaultsort" property |
| 243 | * @return string|null |
| 244 | */ |
| 245 | public function getDefaultSort() { |
| 246 | $sort = $this->parserOutput->getPageProperty( 'defaultsort' ); |
| 247 | if ( $sort === false ) { |
| 248 | return null; |
| 249 | } |
| 250 | return $sort; |
| 251 | } |
| 252 | } |