Fixed Width Parsing

Is there a better way to fixed width parsing other than the code below? It results in very ugly railroad diagrams.

$.FOR = function(n, fn) {
    for (let i = 0; i < n; i++) fn.call(this, i);
}

$.FOR(46, i => this.consume(i, tokens.Space));

Thank you!

[FallingSnow]

@bd82 Thanks for you’re input.

[bd82]

closing this for now, re-open if you have related questions.