webpack/lib/compareLocations.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

/**
 * @typedef {Object} LineAndColumn
 * @property {number=} line
 * @property {number=} column
 */

/**
 * @typedef {Object} NodeLocation
 * @property {LineAndColumn=} start
 * @property {LineAndColumn=} end
 * @property {number=} index
 */

/**
 * Compare two locations
 * @param {string|NodeLocation} a A location node
 * @param {string|NodeLocation} b A location node
 * @returns {-1|0|1} sorting comparator value
 */
module.exports = (a, b) => {
	if (typeof a === "string") {
		if (typeof b === "string") {
			if (a < b) return -1;
			if (a > b) return 1;
			return 0;
		} else if (typeof b === "object") {
			return 1;
		} else {
			return 0;
		}
	} else if (typeof a === "object") {
		if (typeof b === "string") {
			return -1;
		} else if (typeof b === "object") {
			if (a.start && b.start) {
				const ap = a.start;
				const bp = b.start;
				if (ap.line < bp.line) return -1;
				if (ap.line > bp.line) return 1;
				if (ap.column < bp.column) return -1;
				if (ap.column > bp.column) return 1;
			}
			if (a.index < b.index) return -1;
			if (a.index > b.index) return 1;
			return 0;
		} else {
			return 0;
		}
	}
};