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25 lines
661 B
25 lines
661 B
'use strict'
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var realizePackageSpecifier = require('realize-package-specifier')
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var isRegistrySpecifier = require('./is-registry-specifier.js')
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module.exports = function (name, sw, where, cb) {
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function lookup (ver, cb) {
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realizePackageSpecifier(name + '@' + ver, where, cb)
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}
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if (sw.resolved) {
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return lookup(sw.resolved, cb)
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} else if (sw.from) {
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return lookup(sw.from, function (err, spec) {
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if (err || isRegistrySpecifier(spec)) {
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return thenUseVersion()
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} else {
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return cb(null, spec)
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}
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})
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} else {
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return thenUseVersion()
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}
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function thenUseVersion () {
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lookup(sw.version, cb)
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}
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}
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