@thaunknown/web-irc/middlewarehandler.js

A TypeScript port of irc-framework's WebIRC client, without the bloat of unnceessary packages.

const slice = [].slice;
export default class MiddlewareHandler {
    stack = [];
    use(middleware) {
        this.stack.push(middleware);
    }
    clear() {
        this.stack = [];
    }
    handle(args, callback) {
        let index = 0;
        let length;
        if (typeof args === 'function') {
            callback = args;
            args = [];
        }
        args = args || [];
        // Count of arguments a middleware accepts
        length = args.length + 1;
        const next = (err) => {
            const middleware = this.stack[index++];
            let _args;
            if (arguments.length > 1) {
                // update args by passed values
                args = slice.call(arguments, 1);
                length = args.length + 1;
            }
            if (!middleware) {
                if (callback) {
                    args.unshift(err);
                    callback.apply(null, args);
                }
                return;
            }
            _args = args.slice();
            _args.push(next);
            if (middleware.length > length) {
                _args.unshift(err);
            }
            else if (err) {
                // This middleware can't accept error
                next(err);
                return;
            }
            try {
                middleware(..._args);
            }
            catch (e) {
                next(e);
            }
        };
        next();
    }
    compose(callback) {
        return (...args) => this.handle(slice(...args), callback);
    }
}
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