66d444aa40
We use arrow functions in most places; this enforces it. Passing arrow functions to Mocha is discouraged: https://mochajs.org/#arrow-functions This was a mix of autofixes and hand adjustments.
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(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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