24   let spec
37     spec = arg
39     spec = arg
42     spec = arg.slice(nameEndsAt + 1)
49       spec = arg
52   return resolve(name, spec, where, arg)
57 function resolve (name, spec, where, arg) {  argument
61     rawSpec: spec,
67   if (spec && (isFilespec.test(spec) || /^file:/i.test(spec))) {
69   } else if (spec && /^npm:/i.test(spec)) {
73   const hosted = HostedGit.fromUrl(spec, {noGitPlus: true, noCommittish: true})
76   } else if (spec && isURL.test(spec)) {
78   } else if (spec && (hasSlashes.test(spec) || isFilename.test(spec))) {
133   const spec = this.saveSpec || this.fetchSpec || this.rawSpec
134   if (spec != null && spec !== '') full.push(spec)
156 function resolvePath (where, spec) {  argument
157   if (isAbsolutePath.test(spec)) return spec
158   return path().resolve(where, spec)
172   const spec = res.rawSpec.replace(/\\/g, '/')
175   if (/^~[/]/.test(spec)) {
178     res.fetchSpec = resolvePath(osenv.home(), spec.slice(2))
179     res.saveSpec = 'file:' + spec
181     res.fetchSpec = resolvePath(where, spec)
182     if (isAbsolute(spec)) {
183       res.saveSpec = 'file:' + spec
199 function unsupportedURLType (protocol, spec) {  argument
200   const err = new Error(`Unsupported URL Type "${protocol}": ${spec}`)
205 function matchGitScp (spec) {  argument
214   const matched = spec.match(/^git\+ssh:\/\/([^:#]+:[^#]+(?:\.git)?)(?:#(.*))?$/i)
282   const spec = res.rawSpec === '' ? 'latest' : res.rawSpec
283   // no save spec for registry components as we save based on the fetched
286   res.fetchSpec = spec
288   const version = semver.valid(spec, true)
289   const range = semver.validRange(spec, true)
295     if (encodeURIComponent(spec) !== spec) {
296       throw invalidTagName(spec)