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