exception: Avoid preg_replace for literal swap

[lhc/web/wiklou.git] / includes / parser / ParserOutput.php

diff --git a/includes/parser/ParserOutput.php b/includes/parser/ParserOutput.php
index 48ba111..445981b 100644 (file)
--- a/includes/parser/ParserOutput.php
+++ b/includes/parser/ParserOutput.php
@@ -1290,6 +1290,42 @@ class ParserOutput extends CacheTime {
                );
        }
 
+       // TODO remove this method once old parser cache objects have expired, probably mid-October 2018
+       public function __wakeup() {
+               // T203716 remove wrapper that was added by logic in an older version of this class,
+               // where the wrapper was included in mText. This might sometimes remove a wrapper that's
+               // genuine content (manually added to a system message), but that will work out OK, see below.
+               $text = $this->getRawText();
+               $start = Html::openElement( 'div', [
+                       'class' => 'mw-parser-output'
+               ] );
+               $startLen = strlen( $start );
+               $end = Html::closeElement( 'div' );
+               $endPos = strrpos( $text, $end );
+               $endLen = strlen( $end );
+               if ( substr( $text, 0, $startLen ) === $start && $endPos !== false
+                        // if the closing div is followed by real content, bail out of unwrapping
+                        && preg_match( '/^(?>\s*<!--.*?-->)*\s*$/s', substr( $text, $endPos + $endLen ) )
+               ) {
+                       $text = substr( $text, $startLen );
+                       $text = substr( $text, 0, $endPos - $startLen ) .
+                                       substr( $text, $endPos - $startLen + $endLen );
+                       $this->setText( $text );
+                       // We found a wrapper to remove, so the ParserOutput was probably created by the
+                       // code path that now contains an addWrapperDivClass( 'mw-parser-output' ) call,
+                       // but it did not contain it when this object was cached, so we need to fix the
+                       // wrapper class variable.
+                       // If this was a message with a manually added wrapper, we are technically wrong about
+                       // this but we were wrong about the unwrapping as well so it will work out just right,
+                       // except when this is a normal page view of such a message page, in which case
+                       // it will be single-wrapped instead of double-wrapped (harmless) or something wants
+                       // render the message with unwrap=true (in which case the message won't be wrapped even
+                       // though it should, but the few code paths using unwrap=true only do it for real pages).
+                       $this->clearWrapperDivClass();
+                       $this->addWrapperDivClass( 'mw-parser-output' );
+               }
+       }
+
        /**
         * Merges internal metadata such as flags, accessed options, and profiling info
         * from $source into this ParserOutput. This should be used whenever the state of $source