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'use strict'
const duck = require('protoduck')
const Fetcher = duck.define(['spec', 'opts', 'manifest'], {
manifest: ['spec', 'opts'],
tarball: ['spec', 'opts'],
fromManifest: ['manifest', 'spec', 'opts'],
clearMemoized () {}
}, {name: 'Fetcher'})
module.exports = Fetcher
module.exports.manifest = manifest
function manifest (spec, opts) {
const fetcher = getFetcher(spec.type)
return fetcher.manifest(spec, opts)
}
module.exports.tarball = tarball
function tarball (spec, opts) {
return getFetcher(spec.type).tarball(spec, opts)
}
module.exports.fromManifest = fromManifest
function fromManifest (manifest, spec, opts) {
return getFetcher(spec.type).fromManifest(manifest, spec, opts)
}
const TYPES = new Set([
'directory',
'file',
'git',
'hosted',
'range',
'remote',
'tag',
'version'
])
const fetchers = {}
module.exports.clearMemoized = clearMemoized
function clearMemoized () {
Object.keys(fetchers).forEach(k => {
fetchers[k].clearMemoized()
})
}
function getFetcher (type) {
if (!TYPES.has(type)) {
throw new Error(`Invalid dependency type requested: ${type}`)
} else if (fetchers[type]) {
return fetchers[type]
} else {
const fetcher = (
fetchers[type] ||
(
fetchers[type] = require(`./fetchers/${type}`)
)
)
return fetcher
}
}
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