@v4fire/core/src/core/log/base/level.ts

V4Fire core library

/*!
 * V4Fire Core
 * https://github.com/V4Fire/Core
 *
 * Released under the MIT license
 * https://github.com/V4Fire/Core/blob/master/LICENSE
 */

import type { LogLevel } from 'core/log/interface';

export const
	DEFAULT_LEVEL: LogLevel = 'info';

type LogLevelOrder = Record<
	LogLevel,
	number
>;

const order: LogLevelOrder = {
	error: 1,
	warn: 2,
	info: 3
};

/**
 * Compares log levels:
 *
 * < 0 if left < right
 * > 0 if left > right
 * = 0 if left === right
 *
 * @param left
 * @param right
 */
export function cmpLevels(left: LogLevel, right: LogLevel): number {
	const
		l = order[left],
		hasL = Object.isTruly(l);

	const
		r = order[right],
		hasR = Object.isTruly(r);

	if (!hasL && !hasR) {
		return 0;
	}

	if (!hasL) {
		return -1;
	}

	if (!hasR) {
		return 1;
	}

	return l - r;
}