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.
60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
/**
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* Utilities relating to Lua 'rocks' version numbers.
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* This compares version numbers using the algorithm
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* followed by luarocks command-line utility
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*/
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'use strict';
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// Compare two arrays containing splitted and transformed to
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// positive/negative numbers parts of version strings,
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// respecting negative/missing values:
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// [1, 2, 1] > [1, 2], but [1, 2, -1] < [1, 2] ([1, 2] is aligned to [1, 2, 0])
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// Return a negative value if v1 < v2,
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// zero if v1 = v2,
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// a positive value otherwise.
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function compareVersionLists(v1, v2) {
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const maxLength = Math.max(v1.length, v2.length);
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let p1, p2;
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for (let i = 0; i < maxLength; i++) {
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p1 = v1[i] || 0;
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p2 = v2[i] || 0;
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if (p1 > p2) return 1;
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if (p1 < p2) return -1;
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}
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return 0;
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}
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exports.compareVersionLists = compareVersionLists;
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// Parse a dotted version string to an array of numbers
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// 'rc', 'pre', 'beta', 'alpha' are converted to negative numbers
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function parseVersion(versionString) {
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versionString = versionString.toLowerCase().replace('-', '.');
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const versionList = [];
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versionString.split('.').forEach(function(versionPart) {
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const parsedPart = /(\d*)([a-z]*)(\d*)/.exec(versionPart);
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if (parsedPart[1]) {
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versionList.push(parseInt(parsedPart[1]));
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}
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if (parsedPart[2]) {
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let weight;
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// calculate weight as a negative number
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// 'rc' > 'pre' > 'beta' > 'alpha' > any other value
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switch (parsedPart[2]) {
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case 'alpha':
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case 'beta':
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case 'pre':
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case 'rc':
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weight = (parsedPart[2].charCodeAt(0) - 128) * 100;
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break;
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default:
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weight = -10000;
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}
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// add positive number, i.e. 'beta5' > 'beta2'
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weight += parseInt(parsedPart[3]) || 0;
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versionList.push(weight);
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}
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});
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return versionList;
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}
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exports.parseVersion = parseVersion;
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