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| 1 | <?php |
| 2 | |
| 3 | class MathHighlighter { |
| 4 | |
| 5 | private const WINDOW_SIZE = 1200; |
| 6 | |
| 7 | /** @var string */ |
| 8 | private $wikiText; |
| 9 | |
| 10 | /** |
| 11 | * @param string $fId |
| 12 | * @param int $revId |
| 13 | * @param bool $highlight |
| 14 | */ |
| 15 | public function __construct( $fId, $revId, $highlight = true ) { |
| 16 | $gen = MathIdGenerator::newFromRevisionId( $revId ); |
| 17 | $unique = $gen->getUniqueFromId( $fId ); |
| 18 | $wikiText = $gen->getWikiText(); |
| 19 | $tagPos = strpos( $wikiText, $unique ); |
| 20 | $startPos = $this->getStartPos( $tagPos, $wikiText ); |
| 21 | $length = $this->getEndPos( $tagPos, $wikiText ) - $startPos; |
| 22 | $wikiText = substr( $wikiText, $startPos, $length ); |
| 23 | $tag = $gen->getTagFromId( $fId ); |
| 24 | if ( $highlight ) { |
| 25 | $wikiText = str_replace( $unique, '<span id="mathhighlight" style="background-color: yellow">' |
| 26 | . $tag[3] . '</span>', $wikiText ); |
| 27 | } |
| 28 | foreach ( $gen->getMathTags() as $key => $content ) { |
| 29 | $wikiText = str_replace( $key, $content[3], $wikiText ); |
| 30 | } |
| 31 | $this->wikiText = $wikiText; |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * @param int $tagPos |
| 36 | * @param string $wikiText |
| 37 | * @return int |
| 38 | */ |
| 39 | private function getStartPos( $tagPos, $wikiText ) { |
| 40 | $startPos = max( $tagPos - round( self::WINDOW_SIZE / 2 ), 0 ); |
| 41 | if ( $startPos > 0 ) { |
| 42 | // Heuristics to find a reasonable cutting point |
| 43 | $newPos = strpos( $wikiText, "\n", $startPos ); |
| 44 | if ( $newPos !== false && ( $newPos - $startPos ) < round( self::WINDOW_SIZE / 4 ) ) { |
| 45 | // only change startPos, if it seems reasonable |
| 46 | $startPos = $newPos; |
| 47 | } |
| 48 | } |
| 49 | return $startPos; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * @param int $tagPos |
| 54 | * @param string $wikiText |
| 55 | * @return int |
| 56 | */ |
| 57 | private function getEndPos( $tagPos, $wikiText ) { |
| 58 | $halfWindow = round( self::WINDOW_SIZE / 2 ); |
| 59 | $distance2End = strlen( $wikiText ) - $tagPos; |
| 60 | if ( $distance2End > $halfWindow ) { |
| 61 | $newPos = strpos( $wikiText, "\n", $tagPos + $halfWindow ); |
| 62 | if ( $newPos !== false && ( $newPos - $tagPos ) < round( 3 / 4 * self::WINDOW_SIZE ) ) { |
| 63 | // only change startPos, if it seems reasonable |
| 64 | return $newPos; |
| 65 | } else { |
| 66 | return $tagPos + $halfWindow; |
| 67 | } |
| 68 | } else { |
| 69 | return strlen( $wikiText ); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * @return string |
| 75 | */ |
| 76 | public function getWikiText() { |
| 77 | return $this->wikiText; |
| 78 | } |
| 79 | |
| 80 | } |