Method compileCondition

lib/rules/RuleSetCompiler.js:296–410

* Returns compiled condition. * @param {string} path current path * @param {RuleSetLoaderOptions} condition user provided condition value * @returns {Condition} compiled condition

(path, condition)

	 * @returns {Condition} compiled condition
	 */
	compileCondition(path, condition) {
		if (condition === "") {
			return {
				matchWhenEmpty: true,
				fn: (str) => str === ""
			};
		}
		if (!condition) {
			throw this.error(
				path,
				condition,
				"Expected condition but got falsy value"
			);
		}
		if (typeof condition === "string") {
			return {
				matchWhenEmpty: condition.length === 0,
				fn: (str) => typeof str === "string" && str.startsWith(condition)
			};
		}
		if (typeof condition === "function") {
			try {
				return {
					matchWhenEmpty: condition(""),
					fn: /** @type {RuleConditionFunction} */ (condition)
				};
			} catch (_err) {
				throw this.error(
					path,
					condition,
					"Evaluation of condition function threw error"
				);
			}
		}
		if (condition instanceof RegExp) {
			return {
				matchWhenEmpty: condition.test(""),
				fn: (v) => typeof v === "string" && condition.test(v)
			};
		}
		if (Array.isArray(condition)) {
			const items = condition.map((c, i) =>
				this.compileCondition(`${path}[${i}]`, c)
			);
			return this.combineConditionsOr(items);
		}

		if (typeof condition !== "object") {
			throw this.error(
				path,
				condition,
				`Unexpected ${typeof condition} when condition was expected`
			);
		}

		/** @type {Condition[]} */
		const conditions = [];
		for (const key of Object.keys(condition)) {