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BBCode Parser

Parse BBCode into AST and convert into HTML

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/549682/1681117/BBCode%20Parser.js

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Author: PYUDNG
Version: 0.2.3
Created: 2025-09-16
Updated: 2025-10-21
Size: 26.4 KB
License: GPL-3.0-or-later

A BBCode parser without any built-in parsing rules, allowing users to implement their own rules.

Usage

1. First of all, create parser

const parser = new BBCodeParser.BBCodeParser();

2. Implement and register parsing rules

A rule for [url=URL]CONTENT[/url] and [url]URL_AS_CONTENT[/url] can be registered like this:

parser.register({
    'url': {
        openTag(params, content) {
            let url = params ?? content;
            url = url.startsWith('http://') || url.startsWith('https://') ? url : 'http://' + url;
            return `<a href="${ url }" target="_blank">`;
        },
        closeTag(params, content) {
            return '</a>'
        },
    }
});

A rule for [b]CONTENT[/b] can be registered like this:

parser.register({
    'b': {
        openTag(params, content) {
            return '<b>';
        },
        closeTag(params, content) {
            return '</b>';
        },
    },
});

And yes, they can be registered with one call:

parser.register({
    'url': {
        openTag(params, content) {
            let url = params ?? content;
            url = url.startsWith('http://') || url.startsWith('https://') ? url : 'http://' + url;
            return `<a href="${ url }" target="_blank">`;
        },
        closeTag(params, content) {
            return '</a>'
        },
    },
    'b': {
        openTag(params, content) {
            return '<b>';
        },
        closeTag(params, content) {
            return '</b>';
        },
    },
});

3. Parse bbcode (and get html if need)

const result = parser.parse('[b]Hello[/b], [url=https://example.com/]bbcode[/url]');

// You can access html or ast / nodes in result object, like
console.log(result.html);
console.log(result.html_ast);
console.log(result.ast);

// Check if there's any error while paring
console.log(result.errors);

4. Types

Please refer to JSDoc in source code.
(Sadly comments are written in Chinese)

扫码关注【爱吃馍】

Usage

1. First of all, create parser

2. Implement and register parsing rules

3. Parse bbcode (and get html if need)

4. Types