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