ds4/src/module/rolls/slaying-dice-modifier.ts

import { DS4Check } from "./check";

export default function registerSlayingDiceModifier(): void {
    DicePool.MODIFIERS.x = slay;
    DicePool.POOL_REGEX = /^{([^}]+)}([A-z]([A-z0-9<=>]+)?)?$/;
}

function slay(this: DicePool, modifier: string): void {
    const rgx = /[xX]/;
    const match = modifier.match(rgx);
    if (!match || !this.rolls) return;

    let checked = 0;
    while (checked < (this.dice.length ?? 0)) {
        const diceTerm = this.dice[checked];
        checked++;
        if (diceTerm instanceof DS4Check && diceTerm.coup) {
            const formula = `dsv${diceTerm.checkTargetNumber}c${diceTerm.maximumCoupResult}:${diceTerm.minimumFumbleResult}n`;
            const additionalRoll = Roll.create(formula).evaluate();

            this.rolls.push(additionalRoll);
            this.results.push({ result: additionalRoll.total ?? 0, active: true });
        }
        if (checked > 1000) throw new Error(game.i18n.localize("DS4.ErrorSlayingDiceRecursionLimitExceeded"));
    }
}