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197 lines
4.6 KiB
197 lines
4.6 KiB
'use strict'
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class FiggyPudding {
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constructor (specs, opts, providers) {
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this.__specs = specs || {}
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Object.keys(this.__specs).forEach(alias => {
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if (typeof this.__specs[alias] === 'string') {
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const key = this.__specs[alias]
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const realSpec = this.__specs[key]
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if (realSpec) {
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const aliasArr = realSpec.aliases || []
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aliasArr.push(alias, key)
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realSpec.aliases = [...(new Set(aliasArr))]
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this.__specs[alias] = realSpec
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} else {
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throw new Error(`Alias refers to invalid key: ${key} -> ${alias}`)
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}
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}
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})
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this.__opts = opts || {}
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this.__providers = reverse((providers).filter(
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x => x != null && typeof x === 'object'
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))
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this.__isFiggyPudding = true
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}
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get (key) {
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return pudGet(this, key, true)
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}
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get [Symbol.toStringTag] () { return 'FiggyPudding' }
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forEach (fn, thisArg = this) {
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for (let [key, value] of this.entries()) {
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fn.call(thisArg, value, key, this)
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}
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}
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toJSON () {
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const obj = {}
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this.forEach((val, key) => {
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obj[key] = val
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})
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return obj
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}
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* entries (_matcher) {
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for (let key of Object.keys(this.__specs)) {
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yield [key, this.get(key)]
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}
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const matcher = _matcher || this.__opts.other
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if (matcher) {
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const seen = new Set()
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for (let p of this.__providers) {
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const iter = p.entries ? p.entries(matcher) : entries(p)
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for (let [key, val] of iter) {
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if (matcher(key) && !seen.has(key)) {
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seen.add(key)
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yield [key, val]
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}
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}
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}
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}
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}
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* [Symbol.iterator] () {
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for (let [key, value] of this.entries()) {
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yield [key, value]
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}
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}
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* keys () {
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for (let [key] of this.entries()) {
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yield key
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}
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}
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* values () {
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for (let [, value] of this.entries()) {
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yield value
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}
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}
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concat (...moreConfig) {
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return new Proxy(new FiggyPudding(
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this.__specs,
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this.__opts,
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reverse(this.__providers).concat(moreConfig)
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), proxyHandler)
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}
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}
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try {
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const util = require('util')
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FiggyPudding.prototype[util.inspect.custom] = function (depth, opts) {
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return (
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this[Symbol.toStringTag] + ' '
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) + util.inspect(this.toJSON(), opts)
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}
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} catch (e) {}
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function BadKeyError (key) {
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throw Object.assign(new Error(
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`invalid config key requested: ${key}`
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), {code: 'EBADKEY'})
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}
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function pudGet (pud, key, validate) {
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let spec = pud.__specs[key]
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if (validate && !spec && (!pud.__opts.other || !pud.__opts.other(key))) {
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BadKeyError(key)
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} else {
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if (!spec) { spec = {} }
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let ret
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for (let p of pud.__providers) {
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ret = tryGet(key, p)
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if (ret === undefined && spec.aliases && spec.aliases.length) {
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for (let alias of spec.aliases) {
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if (alias === key) { continue }
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ret = tryGet(alias, p)
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if (ret !== undefined) {
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break
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}
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}
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}
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if (ret !== undefined) {
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break
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}
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}
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if (ret === undefined && spec.default !== undefined) {
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if (typeof spec.default === 'function') {
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return spec.default(pud)
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} else {
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return spec.default
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}
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} else {
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return ret
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}
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}
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}
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function tryGet (key, p) {
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let ret
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if (p.__isFiggyPudding) {
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ret = pudGet(p, key, false)
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} else if (typeof p.get === 'function') {
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ret = p.get(key)
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} else {
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ret = p[key]
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}
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return ret
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}
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const proxyHandler = {
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has (obj, prop) {
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return prop in obj.__specs && pudGet(obj, prop, false) !== undefined
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},
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ownKeys (obj) {
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return Object.keys(obj.__specs)
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},
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get (obj, prop) {
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if (
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typeof prop === 'symbol' ||
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prop.slice(0, 2) === '__' ||
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prop in FiggyPudding.prototype
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) {
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return obj[prop]
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}
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return obj.get(prop)
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},
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set (obj, prop, value) {
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if (
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typeof prop === 'symbol' ||
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prop.slice(0, 2) === '__'
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) {
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obj[prop] = value
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return true
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} else {
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throw new Error('figgyPudding options cannot be modified. Use .concat() instead.')
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}
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},
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deleteProperty () {
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throw new Error('figgyPudding options cannot be deleted. Use .concat() and shadow them instead.')
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}
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}
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module.exports = figgyPudding
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function figgyPudding (specs, opts) {
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function factory (...providers) {
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return new Proxy(new FiggyPudding(
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specs,
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opts,
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providers
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), proxyHandler)
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}
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return factory
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}
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function reverse (arr) {
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const ret = []
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arr.forEach(x => ret.unshift(x))
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return ret
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}
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function entries (obj) {
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return Object.keys(obj).map(k => [k, obj[k]])
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}
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