递归BBCode解析 [英] Recursive BBCode Parsing

问题描述

我正在尝试在我的脚本中解析 BBCode.现在，它无缝地工作，直到我尝试缩进不仅仅是粗体或下划线的 BBCode - 例如剧透、url、字体大小等 - 然后它搞砸了.这是我的代码:

I'm trying to parse BBCode in my script. Now, it works seamelessly, until I try to indent BBCode that's more than just bold or underline - such as spoiler, url, font size, etc. - then it screws up. Here's my code:

function parse_bbcode($text) {
    global $db;
    $oldtext = $text;
    $bbcodes = $db->select('*', 'bbcodes');
    foreach ($bbcodes as $bbcode) {
        switch ($bbcode->type) {
            case 'simple': {
                $find = '{content}';
                $replace = '${1}';
                $text = preg_replace(
                    '/\['.$bbcode->tag.'\](.+)\[\/'.$bbcode->tag.'\]/i',
                    str_replace($find, $replace, $bbcode->html),
                    $text);
                    break;
            }
            case 'property':
            case 'options': {
                $find = array ( '{property}', '{content}' );
                $replace = array ( '${1}', '${2}' );
                $text = preg_replace(
                    '/\['.$bbcode->tag.'\=(.[^\"]*)\](.+)\[\/'.$bbcode->tag.'\]/i',
                    str_replace($find, $replace, $bbcode->html),
                    $text);
                    break;
            }
        }
    }
    return $text;
}

现在我的猜测是 RegEx 不喜欢模式中的递归性.我该如何改进?示例 $bbcode 对象如下所示:

Now my guess is that the RegEx doesn't like the recursiveness in the pattern. How can I improve it? A sample $bbcode object is as such:

stdClass::__set_state(array(
   'id' => '2',
   'name' => 'Italic',
   'type' => 'simple',
   'tag' => 'i',
   'button_image' => NULL,
   'button_text' => '<i>I</i>',
   'options' => '',
   'prompt' => NULL,
   'html' => '<i>{content}</i>',
   'order' => '1',
))
stdClass::__set_state(array(
   'id' => '3',
   'name' => 'URL',
   'type' => 'property',
   'tag' => 'url',
   'button_image' => NULL,
   'button_text' => 'http://',
   'options' => '',
   'prompt' => 'URL address',
   'html' => '<a href="{property}">{content}</a>',
   'order' => '4',
))

推荐答案

正如 gordon 在评论中所说的 PHP 有一个 BBCode 解析器，所以没有理由重新发明轮子.

As gordon said in comments PHP has a BBCode parser, so no reason to reinvent the wheel.

虽然本机解析器是一个 PECL 包，因此您必须安装它.如果这不是一个选项(例如由于共享托管)，还有一个 PEAR 包:http://pear.php.net/package/HTML_BBCodeParser

The native parser is a PECL package though, so you will have to install it. If that's not an option (for instance due to shared hosting), there is also a PEAR package: http://pear.php.net/package/HTML_BBCodeParser

除此之外，您还可以查看使用 BB 代码源代码的论坛，并使用他们的解析器或对其进行改进.http://www.bbcode.org/implementations.php 还列出了几个 PHP 实现

In addition to those, you can take a look at forums using BB code source code, and either use their parser, or improve it. There is also several PHP implementations listed at http://www.bbcode.org/implementations.php

这篇关于递归BBCode解析的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！