InstallDocFormatter.php

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<?php
class InstallDocFormatter {
        static function format( $text ) {
                $obj = new self( $text );
                return $obj->execute();
        }

        protected function __construct( $text ) {
                $this->text = $text;
        }

        protected function execute() {
                $text = $this->text;
                // Use Unix line endings, escape some wikitext stuff
                $text = str_replace( array( '<', '{{', '[[', "\r" ),
                        array( '&lt;', '&#123;&#123;', '&#91;&#91;', '' ), $text );
                // join word-wrapped lines into one
                do {
                        $prev = $text;
                        $text = preg_replace( "/\n([\\*#\t])([^\n]*?)\n([^\n#\\*:]+)/", "\n\\1\\2 \\3", $text );
                } while ( $text != $prev );
                // Replace tab indents with colons
                $text = preg_replace( '/^\t\t/m', '::', $text );
                $text = preg_replace( '/^\t/m', ':', $text );
                // turn (bug nnnn) into links
                $text = preg_replace_callback('/bug (\d+)/', array( $this, 'replaceBugLinks' ), $text );
                // add links to manual to every global variable mentioned
                $text = preg_replace_callback('/(\$wg[a-z0-9_]+)/i', array( $this, 'replaceConfigLinks' ), $text );
                return $text;
        }

        protected function replaceBugLinks( $matches ) {
                return '<span class="config-plainlink">[https://bugzilla.wikimedia.org/' .
                        $matches[1] . ' bug ' . $matches[1] . ']</span>';
        }

        protected function replaceConfigLinks( $matches ) {
                return '<span class="config-plainlink">[http://www.mediawiki.org/wiki/Manual:' .
                        $matches[1] . ' ' . $matches[1] . ']</span>';
        }
}