text-to-html.js

function convert(text) {
    var word = /^\w/,
        tag = /^\s*<(a|b|i|strong|em|cite)([ \=\'\"\w\-\/\.\:]+)*>/i,
        tokens = text.split('\n'), token, src = [];
    
    for (var i=0, len=tokens.length; i < len; i++) {
        token = tokens[i];
        if (word.test(token) || tag.test(token)) {
            src.push('<p>' + token + '</p>');
        } else {
            src.push(token);
        }
    }
    text = src.join('\n');
    
    var r = /<pre><code>([\s\S]+?)(?=<\/code><\/pre>)/g;
    text = text.replace(r, function (m, code) {
        return '<pre><code>' + code.replace(/<p>([\s\S]+?)<\/p>/g, '$1');
    });
    return text;
}