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我编写了一个类似于我用来编写此消息的 Javascript bbcode。它还包含一个实时预览框，如下所示。我目前面临的唯一问题是一些嵌套的 bbcode 没有解析。

例如：

[quote]
   [quote][/quote]
[/quote]

解析不正确。

这是我目前的 Javascript。

function preview() {

    var txt = $('#editor').val();
    txt = txt.replace(/</g,'&lt;');
    txt = txt.replace(/>/g,'&gt;');

    txt = txt.replace(/[\r\n]/g,'%lb%');

    var find    = [
                   /\[quote\](.*?)\[\/quote\]/gi,
                   /\[quote author="(.*?)" date="(.*?)"\](.*?)\[\/quote\]/gi,
                   /\[b\](.*?)\[\/b\]/gi,
                   /\[i\](.*?)\[\/i\]/gi,
                   /\[u\](.*?)\[\/u\]/gi,
                   /\[left\](.*?)\[\/left\]/gi,
                   /\[center\](.*?)\[\/center\]/gi,
                   /\[right\](.*?)\[\/right\]/gi,
                   /\[size=(10|12|24|30)](.*?)\[\/size\]/gi,
                   /\[font=(.*?)](.*?)\[\/font\]/gi,
                   /\[color=(.*?)](.*?)\[\/color\]/gi,
                   /\[url(?:\=?)(.*?)\](.*?)\[\/url\]/gi,
                   /\[email=(.*?)\](.*?)\[\/email\]/gi,
                   /\[email\](.*?)\[\/email\]/gi,
                   /\[img(.*?)\](.*?)\[\/img\]/gi,
                   /(?:%lb%|\s)*\[code(?:\=?)(?:.*?)\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/code\](?:%lb%|\s)*/gi,

                   /\[list(.*?)\](.*?)\[\*\](.*?)(?:%lb%|\s)*(\[\*\].*?\[\/list\]|\[\/list\])/i,
                   /(?:%lb%|\s)*\[list\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/list\](?:%lb%|\s)*/gi,
                   /(?:%lb%|\s)*\[list=(\d)\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/list\](?:%lb%|\s)*/gi,
                   /(?:%lb%){3,}/g

                   ];
    var replace = [
                   '<blockquote><div class="quote"><div class="quote_body">$1</div></div></blockquote>',
                   '<blockquote><div class="quote"><div class="quote_author"><span class="quote_from">Quote from</span> <span class="author">$1</span> on <span class="date">$2</span></div><div class="quote_body">$3</div></div></blockquote>',
                   '<b>$1<\/b>',
                   '<i>$1<\/i>',
                   '<u>$1<\/u>',
                   '<div class="align_left">$1<\/div>',
                   '<div class="align_center">$1<\/div>',
                   '<div class="align_right">$1<\/div>',
                   '<span style="font-size:$1px;">$2</span>',
                   '<span style="font-family:$1;">$2</span>',
                   '<span style="color:$1;">$2</span>',
                   '<a href="$1">$2</a>',
                   '<a href="mailto:$1">$2</a>',
                   '<a href="mailto:$1">$1</a>',                   
                   '<img $1 src="$2" />',
                   '<pre><code>$1</code></pre>',
                   '[list$1]$2<li>$3</li>$4',
                   '<ul>$1</ul>',
                   '<ol start=$1>$2</ol>',
                   '%lb%%lb%'

                   ];

    // fix [*] so that they only work inside [/list]
    for(var i in find)
    {
        txt = txt.replace(find[i],replace[i]);
        if(i == 17) while(txt.match(find[i],replace[i])) txt = txt.replace(find[i],replace[i]);
    }

    // Fix Smilies
    txt = txt.replace(/%lb%/g,'<br />');
    txt = txt.replace(/\:\)/g, '<img class="smiley" src="/img/smilies/smile.gif">');
    txt = txt.replace(/\:-\)/g, '<img class="smiley" src="/img/smilies/happy.gif">');
    txt = txt.replace(/\:D/g, '<img class="smiley" src="/img/smilies/biggrin.gif">');
    txt = txt.replace(/\:\(/g, '<img class="smiley" src="/img/smilies/sad.gif">');
    txt = txt.replace(/8\)/g, '<img class="smiley" src="/img/smilies/cool.gif">');
    txt = txt.replace(/=O/g, '<img class="smiley" src="/img/smilies/surprised.gif">');
    txt = txt.replace(/\:-\|\|/g, '<img class="smiley" src="/img/smilies/mad.gif">');
    txt = txt.replace(/\:P/g, '<img class="smiley" src="/img/smilies/stongue.gif">');
    txt = txt.replace(/\}\-\(/g, '<img class="smiley" src="/img/smilies/confused.gif">');

    // Format Dates
    txt = txt.replace(/\d{10}/g, function($0) {
        var d = new Date($0*1000);
        var months = new Array('January','February','March','April','May','June','July','August','September','October','November','December');
        return "" + months[d.getMonth()] + " " + d.getDate() + ", " + d.getFullYear() + ", " + (d.getHours()%12) + ":" + d.getMinutes() + " " + (d.getHours()<12 ? 'AM' : 'PM');
    });

    // Update the preview box
    $('.preview').html(txt);
}

这翻转了我所有的 bbcode 标签。引用标签的问题在于它有时不会翻转嵌套的引用标签或解析内部引用标签的内容。

如果有人能够提供解决方案，我将不胜感激。谢谢！

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1 回答 1

5

三种解决方案：

  1. 编写解析器。这将产生最佳解决方案，但需要付出不小的努力。

  2. 找一个 BBCode 解析库。质量可能与第一名一样好，而且更容易。

  3. 在每个标签正则表达式的内部添加一个负前瞻，并不断应用，直到没有匹配。例如：

    \[quote\]((?:[^](?!\[quote\]))*?)\[\/quote\]

    这将捕获内部报价，然后一旦被替换，外部报价。不像其他两个那样干净，但可能是最快的修复。

于 2010-03-10T23:44:08.067 回答