SpoilerAlert/includes/SpoilerAlertHooks.php

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PHP
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<?php
class SpoilerAlertHooks {
public static function onParserFirstCallInit( Parser $parser ) {
$parser->setHook( 'spoiler', [ self::class, 'renderSpoiler' ] );
return true;
}
public static function renderSpoiler( $input, array $args, Parser $parser, PPFrame $frame ) {
$output = $parser->recursiveTagParse( $input, $frame );
return "<span class='spoiler' onclick='this.classList.toggle(\"revealed\")'>" . htmlspecialchars( $output ) . "</span>";
}
public static function onBeforePageDisplay( OutputPage &$out, Skin &$skin ) {
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$out->addModuleStyles( ['ext.spoileralert'] );
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return true;
}
}