Paul MelnikowandGitHub
f271b82670
Because I despise nitpicking stuff like indentation and spacing in pull request comments, I'd like to nudge forward our automated style checking, at least for new files being added. I don't want to totally rewrite server.js just to get automated style checking… the blame tracking is just too useful. So let's it's just take care of that when we start splitting it out. More discussion in #948.
84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
/**
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* Utilities relating to generating badges relating to version numbers. Includes
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* comparing versions to determine the latest, and determining the color to use
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* for the badge based on whether the version is a stable release.
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*
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* For utilities specific to PHP version ranges, see php-version.js.
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*/
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'use strict';
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const semver = require('semver');
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// Given a list of versions (as strings), return the latest version.
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// Return undefined if no version could be found.
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function latest(versions) {
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let version = '';
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let origVersions = versions;
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versions = versions.filter(function(version) {
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return (/^v?[0-9]/).test(version);
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});
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try {
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version = semver.maxSatisfying(versions, '');
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} catch(e) {
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version = latestDottedVersion(versions);
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}
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if (version === undefined) {
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origVersions = origVersions.sort();
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version = origVersions[origVersions.length - 1];
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}
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return version;
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}
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exports.latest = latest;
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function listCompare(a, b) {
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const alen = a.length, blen = b.length;
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for (let i = 0; i < alen; i++) {
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if (a[i] < b[i]) {
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return -1;
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} else if (a[i] > b[i]) {
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return 1;
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}
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}
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return alen - blen;
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}
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exports.listCompare = listCompare;
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// === Private helper functions ===
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// Take a list of string versions.
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// Return the latest, or undefined, if there are none.
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function latestDottedVersion(versions) {
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const len = versions.length;
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if (len === 0) { return; }
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let version = versions[0];
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for (let i = 1; i < len; i++) {
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if (compareDottedVersion(version, versions[i]) < 0) {
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version = versions[i];
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}
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}
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return version;
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}
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// Take string versions.
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// -1 if v1 < v2, 1 if v1 > v2, 0 otherwise.
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function compareDottedVersion(v1, v2) {
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const parts1 = /([0-9\.]+)(.*)$/.exec(v1);
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const parts2 = /([0-9\.]+)(.*)$/.exec(v2);
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if (parts1 != null && parts2 != null) {
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const numbers1 = parts1[1];
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const numbers2 = parts2[1];
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const distinguisher1 = parts1[2];
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const distinguisher2 = parts2[2];
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const numlist1 = numbers1.split('.').map(function(e) { return +e; });
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const numlist2 = numbers2.split('.').map(function(e) { return +e; });
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const cmp = listCompare(numlist1, numlist2);
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if (cmp !== 0) {
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return cmp;
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} else {
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return distinguisher1 < distinguisher2? -1:
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distinguisher1 > distinguisher2? 1: 0;
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}
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}
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return v1 < v2? -1: v1 > v2? 1: 0;
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}
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