Setting up events from event-tagged passages in SugarCube, simple version

event_setup.js

class GameEvent {
	/**
	 * @param {string} target
	 * @param {string} trigger
	 * @param {string} weight
	 * @param {string} priority
	 */
	constructor(target, trigger, weight, priority) {
		this.target = String(target);
		this.trigger = trigger;
		this.weight = weight;
		this.priority = priority;
		if(trigger) {
			this.triggerFunc = new Function("c", "return !!(" + trigger + ")");
		}
		if(weight) {
			this.weightFunc = new Function("c", "return Number(" + weight + ")");
		}
		if(priority) {
			this.priorityFunc = new Function("c", "return Math.round(" + priority + ")");
		}
	}

	/**
	 * @param {any=} context
	 * @returns {boolean}
	 */
	isPossible(context) {
		try {
			return this.triggerFunc ? this.triggerFunc(context || {}) : true;
		} catch(ex) {
			console.log(ex);
			return false;
		}
	}

	/**
	 * @param {any=} context
	 * @returns {number}
	 */
	calcWeight(context) {
		try {
			return this.weightFunc ? this.weightFunc(context || {}) : 1.0;
		} catch(ex) {
			console.log(ex);
			return 0.0;
		}
	}

	/**
	 * @param {any=} context
	 * @returns {number}
	 */
	calcPriority(context) {
		try {
			return this.priorityFunc ? this.priorityFunc(context || {}) : 0;
		} catch(ex) {
			console.log(ex);
			return Number.MIN_SAFE_INTEGER;
		}
	}
}

setup.GameEvent = GameEvent;

setup.events = Story.lookup("tags", "event")
	.map(function(p) {
		var triggersRE = /^TRIGGER:\s*(\S.*?)$/m;
		var weightsSE = /^WEIGHT:\s*(\S.*?)$/m;
		var prioritiesSE = /^PRIORITY:\s*(\S.*?)$/m;
		var trigger = triggersRE.exec(p.text);
		var weight = weightsSE.exec(p.text);
		var priority = prioritiesSE.exec(p.text);
		return new setup.GameEvent(p.title, trigger ? trigger[1] : "", weight ? weight[1] : "", priority ? priority[1] : "");
	});