helper.php

<?php
/**
 * DokuWiki Plugin LineBreak2; helper component
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Chris Smith <chris@jalakai.co.uk>
 * @author     Satoshi Sahara <sahara.satoshi@gmail.com>
 */

if (!defined('DOKU_INC')) die();
if (!defined('DOKU_LF')) define ('DOKU_LF',"\n");

class helper_plugin_linebreak2 extends DokuWiki_Plugin
{
    protected $doc = ''; // output buffer

    /**
     * Flush and empty doc output buffer
     */
    private function flush() {
        $doc = '';
        list($doc, $this->doc) = array($this->doc, $doc);
        return $doc;
    }

    /**
     * Return plain text data, instead of render them into $this->doc
     *
     * @param string $text  the text to display
     */
    public function cdata($text)
    {
        $html = hsc($text); // $this->_xmlEntities($text);

        // get linebreak mode
        $linebreak = $this->getConf('_linebreak', null) ?? $this->getConf('linebreak');

        // BR mode: XHTML output with preserved linebreaks
        if ($linebreak == 'br' || $linebreak == 'BR') {
            $this->doc .= str_replace(DOKU_LF, '<br />', $html);
            return $this->flush();
        }

        // Normal mode or scriptio continua

        // CJK typesetting
        // remove unnecessary spaces between any CJK characters
        // caused by line feed (LF) in a multi-line paragraph
        if ($this->getConf('cjk')) {
            $cjk = '\p{Han}\p{Hiragana}\p{Katakana}\p{Hangul}';
            $html = preg_replace('/(?<=['.$cjk.'])\n(?=['.$cjk.'])/u', '', $html);
        }

        // Markdown linebreak syntax
        // force newline if found more than two spaces at the end of line
        if ($this->getConf('markdown')) {
            $html = preg_replace('/ {2,}\n/', '<br />', $html);
        }

        // scriptio continua: concatenate next line without word delimiting space
        if ($linebreak == '') {
            $this->doc .= str_replace(DOKU_LF, '', $html);
            return $this->flush();
        }

        // Normal mode: identical with the standard xhml renderer
        // leave line break chars as is
        $this->doc .= $html;
        return $this->flush();
    }
}