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/*
This file is part of TALER
(C) 2017 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Semantic versioning, but libtool-style.
* See https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html
*/
/**
* Result of comparing two libtool versions.
*/
export interface VersionMatchResult {
/**
* Is the first version compatible with the second?
*/
compatible: boolean;
/**
* Is the first version older (-1), newser (+1) or
* identical (0)?
*/
currentCmp: number;
}
interface Version {
current: number;
revision: number;
age: number;
}
/**
* Compare two libtool-style version strings.
*/
export function compare(
me: string,
other: string,
): VersionMatchResult | undefined {
const meVer = parseVersion(me);
const otherVer = parseVersion(other);
if (!(meVer && otherVer)) {
return undefined;
}
const compatible =
meVer.current - meVer.age <= otherVer.current &&
meVer.current >= otherVer.current - otherVer.age;
const currentCmp = Math.sign(meVer.current - otherVer.current);
return { compatible, currentCmp };
}
function parseVersion(v: string): Version | undefined {
const [currentStr, revisionStr, ageStr, ...rest] = v.split(":");
if (rest.length !== 0) {
return undefined;
}
const current = Number.parseInt(currentStr);
const revision = Number.parseInt(revisionStr);
const age = Number.parseInt(ageStr);
if (Number.isNaN(current)) {
return undefined;
}
if (Number.isNaN(revision)) {
return undefined;
}
if (Number.isNaN(age)) {
return undefined;
}
return { current, revision, age };
}
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