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151 lines
3.5 KiB
151 lines
3.5 KiB
5 years ago
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'use strict'
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var reusify = require('reusify')
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var empty = []
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function fastfall (context, template) {
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if (Array.isArray(context)) {
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template = context
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context = null
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}
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var queue = reusify(Holder)
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return template ? compiled : fall
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function fall () {
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var current = queue.get()
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current.release = release
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if (arguments.length === 3) {
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current.context = arguments[0]
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current.list = arguments[1]
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current.callback = arguments[2] || noop
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} else {
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current.context = context
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current.list = arguments[0]
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current.callback = arguments[1] || noop
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}
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current.work()
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}
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function release (holder) {
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queue.release(holder)
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}
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function compiled () {
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var current = queue.get()
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current.release = release
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current.list = template
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var args
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var i
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var len = arguments.length - 1
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current.context = this || context
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current.callback = arguments[len] || noop
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switch (len) {
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case 0:
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current.work()
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break
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case 1:
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current.work(null, arguments[0])
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break
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case 2:
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current.work(null, arguments[0], arguments[1])
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break
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case 3:
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current.work(null, arguments[0], arguments[1], arguments[2])
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break
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case 4:
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current.work(null, arguments[0], arguments[1], arguments[2], arguments[3])
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break
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default:
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args = new Array(len + 1)
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args[0] = null
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for (i = 0; i < len; i++) {
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args[i + 1] = arguments[i]
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}
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current.work.apply(null, args)
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}
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}
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}
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function noop () {}
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function Holder () {
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this.list = empty
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this.callback = noop
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this.count = 0
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this.context = undefined
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this.release = noop
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var that = this
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this.work = function work () {
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if (arguments.length > 0 && arguments[0]) {
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return that.callback.call(that.context, arguments[0])
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}
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var len = arguments.length
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var i
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var args
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var func
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if (that.count < that.list.length) {
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func = that.list[that.count++]
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switch (len) {
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case 0:
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case 1:
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return func.call(that.context, work)
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case 2:
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return func.call(that.context, arguments[1], work)
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case 3:
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return func.call(that.context, arguments[1], arguments[2], work)
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case 4:
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return func.call(that.context, arguments[1], arguments[2], arguments[3], work)
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default:
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args = new Array(len)
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for (i = 1; i < len; i++) {
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args[i - 1] = arguments[i]
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}
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args[len - 1] = work
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func.apply(that.context, args)
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}
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} else {
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switch (len) {
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case 0:
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that.callback.call(that.context)
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break
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case 1:
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that.callback.call(that.context, arguments[0])
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break
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case 2:
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that.callback.call(that.context, arguments[0], arguments[1])
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break
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case 3:
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that.callback.call(that.context, arguments[0], arguments[1], arguments[2])
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break
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case 4:
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that.callback.call(that.context, arguments[0], arguments[1], arguments[2], arguments[3])
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break
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default:
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args = new Array(len)
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for (i = 0; i < len; i++) {
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args[i] = arguments[i]
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}
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that.callback.apply(that.context, args)
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}
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that.context = undefined
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that.list = empty
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that.count = 0
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that.release(that)
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}
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}
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}
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module.exports = fastfall
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