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

/** @typedef {import("./Dependency").DependencyLocation} DependencyLocation */

// TODO webpack 5 remove string type from a and b
/**
 * Compare two locations
 * @param {string|DependencyLocation} a A location node
 * @param {string|DependencyLocation} 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 ("start" in a && "start" in b) {
				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 ("name" in a && "name" in b) {
				if (a.name < b.name) return -1;
				if (a.name > b.name) return 1;
			}
			if ("index" in a && "index" in b) {
				if (a.index < b.index) return -1;
				if (a.index > b.index) return 1;
			}
			return 0;
		} else {
			return 0;
		}
	}
};