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127 lines
2.4 KiB
127 lines
2.4 KiB
3 years ago
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'use strict'
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var xtend = require('xtend')
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var reusify = require('reusify')
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var defaults = {
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released: nop,
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results: true
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}
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function fastseries (options) {
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options = xtend(defaults, options)
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var released = options.released
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var queue = reusify(options.results ? ResultsHolder : NoResultsHolder)
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return series
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function series (that, toCall, arg, done) {
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var holder = queue.get()
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holder._released = release
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done = done || nop
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if (toCall.length === 0) {
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done.call(that)
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release(holder)
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} else {
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holder._callback = done
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if (toCall.call) {
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holder._list = arg
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holder._each = toCall
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} else {
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holder._list = toCall
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holder._arg = arg
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}
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holder._callThat = that
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holder.release()
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}
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}
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function release (holder) {
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queue.release(holder)
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released()
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}
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}
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function reset () {
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this._list = null
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this._arg = null
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this._callThat = null
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this._callback = nop
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this._each = null
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}
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function NoResultsHolder () {
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reset.call(this)
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this.next = null
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this._released = null
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var that = this
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var i = 0
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this.release = function () {
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if (i < that._list.length) {
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if (that._each) {
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makeCall(that._callThat, that._each, that._list[i++], that.release)
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} else {
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makeCall(that._callThat, that._list[i++], that._arg, that.release)
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}
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} else {
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that._callback.call(that._callThat)
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reset.call(that)
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i = 0
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that._released(that)
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}
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}
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}
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function ResultsHolder (_release) {
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reset.call(this)
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this._results = []
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this.next = null
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this._released = null
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var that = this
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var i = 0
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this.release = function (err, result) {
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if (i !== 0) that._results[i - 1] = result
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if (!err && i < that._list.length) {
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if (that._each) {
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makeCall(that._callThat, that._each, that._list[i++], that.release)
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} else {
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makeCall(that._callThat, that._list[i++], that._arg, that.release)
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}
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} else {
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that._callback.call(that._callThat, err, that._results)
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reset.call(that)
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that._results = []
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i = 0
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that._released(that)
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}
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}
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}
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function makeCall (that, cb, arg, release) {
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if (that) {
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if (cb.length === 1) {
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cb.call(that, release)
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} else {
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cb.call(that, arg, release)
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}
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} else {
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if (cb.length === 1) {
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cb(release)
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} else {
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cb(arg, release)
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}
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}
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}
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function nop () { }
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module.exports = fastseries
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