syntaxhighlight.php

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<?php
/*
 You may not change or alter any portion of this comment or credits
 of supporting developers from this source code or any supporting source code
 which is considered copyrighted (c) material of the original comment or credit authors.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/

class MytsSyntaxhighlight extends MyTextSanitizerExtension
{
    public function load(MyTextSanitizer &$ts, $source, $language)
    {
        $config = parent::loadConfig(__DIR__);
        if (empty($config['highlight'])) {
            return "<pre>{$source}</pre>";
        }
        $source = $ts->undoHtmlSpecialChars($source);
        $source = stripslashes($source);
        if ($config['highlight'] == 'geshi') {
            $language = str_replace('=', '', $language);
            $language = ($language) ? $language : $config['language'];
            $language = strtolower($language);
            if ($source2 = MytsSyntaxhighlight::geshi($source, $language)) {
                return $source2;
            }
        }
        $source = MytsSyntaxhighlight::php($source);
        return $source;
    }

    public function php($text)
    {
        $text = trim($text);
        $addedtag_open = 0;
        if (!strpos($text, "<?php") and (substr($text, 0, 5) != "<?php")) {
            $text = "<?php " . $text;
            $addedtag_open = 1;
        }
        $addedtag_close = 0;
        if (!strpos($text, "?>")) {
            $text .= "?>";
            $addedtag_close = 1;
        }
        $oldlevel = error_reporting(0);

        //There is a bug in the highlight function(php < 5.3) that it doesn't render
        //backslashes properly like in \s. So here we replace any backslashes
        $text = str_replace("\\", "XxxX", $text);

        $buffer = highlight_string($text, true); // Require PHP 4.20+

        //Placing backspaces back again
        $buffer = str_replace("XxxX", "\\", $buffer);

        error_reporting($oldlevel);
        $pos_open = $pos_close = 0;
        if ($addedtag_open) {
            $pos_open = strpos($buffer, '&lt;?php&nbsp;');
        }
        if ($addedtag_close) {
            $pos_close = strrpos($buffer, '?&gt;');
        }

        $str_open = ($addedtag_open) ? substr($buffer, 0, $pos_open) : "";
        $str_close = ($pos_close) ? substr($buffer, $pos_close + 5) : "";

        $length_open = ($addedtag_open) ? $pos_open + 14 : 0;
        $length_text = ($pos_close) ? $pos_close - $length_open : 0;
        $str_internal = ($length_text) ? substr($buffer, $length_open, $length_text) : substr($buffer, $length_open);

        $buffer = $str_open . $str_internal . $str_close;
        return $buffer;
    }

    public function geshi($source, $language)
    {
        if (!@XoopsLoad::load("geshi", "framework")) {
            return false;
        }

        // Create the new XoopsGeshi object, passing relevant stuff
        // XoopsGeshi should be extending geSHi in Frameworks/geshi/xoopsgeshi.php
        $geshi = new XoopsGeshi($source, $language);

        // Enclose the code in a <div>
        $geshi->set_header_type(GESHI_HEADER_NONE);

        // Sets the proper encoding charset other than "ISO-8859-1"
        $geshi->set_encoding(XoopsLocale::getCharset());

        $geshi->set_link_target("_blank");

        // Parse the code
        $code = $geshi->parse_code();

        return $code;
    }
}