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map.js
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"use strict"; module.exports = function(Promise, PromiseArray, apiRejection, tryConvertToPromise, INTERNAL, debug) { var getDomain = Promise._getDomain; var util = require("./util"); var tryCatch = util.tryCatch; var errorObj = util.errorObj; var async = Promise._async; function MappingPromiseArray(promises, fn, limit, _filter) { this.constructor$(promises); this._promise._captureStackTrace(); var domain = getDomain(); this._callback = domain === null ? fn : util.domainBind(domain, fn); this._preservedValues = _filter === INTERNAL ? new Array(this.length()) : null; this._limit = limit; this._inFlight = 0; this._queue = []; async.invoke(this._asyncInit, this, undefined); } util.inherits(MappingPromiseArray, PromiseArray); MappingPromiseArray.prototype._asyncInit = function() { this._init$(undefined, -2); }; MappingPromiseArray.prototype._init = function () {}; MappingPromiseArray.prototype._promiseFulfilled = function (value, index) { var values = this._values; var length = this.length(); var preservedValues = this._preservedValues; var limit = this._limit; if (index < 0) { index = (index * -1) - 1; values[index] = value; if (limit >= 1) { this._inFlight--; this._drainQueue(); if (this._isResolved()) return true; } } else { if (limit >= 1 && this._inFlight >= limit) { values[index] = value; this._queue.push(index); return false; } if (preservedValues !== null) preservedValues[index] = value; var promise = this._promise; var callback = this._callback; var receiver = promise._boundValue(); promise._pushContext(); var ret = tryCatch(callback).call(receiver, value, index, length); var promiseCreated = promise._popContext(); debug.checkForgottenReturns( ret, promiseCreated, preservedValues !== null ? "Promise.filter" : "Promise.map", promise ); if (ret === errorObj) { this._reject(ret.e); return true; } var maybePromise = tryConvertToPromise(ret, this._promise); if (maybePromise instanceof Promise) { maybePromise = maybePromise._target(); var bitField = maybePromise._bitField; ; if (((bitField & 50397184) === 0)) { if (limit >= 1) this._inFlight++; values[index] = maybePromise; maybePromise._proxy(this, (index + 1) * -1); return false; } else if (((bitField & 33554432) !== 0)) { ret = maybePromise._value(); } else if (((bitField & 16777216) !== 0)) { this._reject(maybePromise._reason()); return true; } else { this._cancel(); return true; } } values[index] = ret; } var totalResolved = ++this._totalResolved; if (totalResolved >= length) { if (preservedValues !== null) { this._filter(values, preservedValues); } else { this._resolve(values); } return true; } return false; }; MappingPromiseArray.prototype._drainQueue = function () { var queue = this._queue; var limit = this._limit; var values = this._values; while (queue.length > 0 && this._inFlight < limit) { if (this._isResolved()) return; var index = queue.pop(); this._promiseFulfilled(values[index], index); } }; MappingPromiseArray.prototype._filter = function (booleans, values) { var len = values.length; var ret = new Array(len); var j = 0; for (var i = 0; i < len; ++i) { if (booleans[i]) ret[j++] = values[i]; } ret.length = j; this._resolve(ret); }; MappingPromiseArray.prototype.preservedValues = function () { return this._preservedValues; }; function map(promises, fn, options, _filter) { if (typeof fn !== "function") { return apiRejection("expecting a function but got " + util.classString(fn)); } var limit = 0; if (options !== undefined) { if (typeof options === "object" && options !== null) { if (typeof options.concurrency !== "number") { return Promise.reject( new TypeError("'concurrency' must be a number but it is " + util.classString(options.concurrency))); } limit = options.concurrency; } else { return Promise.reject(new TypeError( "options argument must be an object but it is " + util.classString(options))); } } limit = typeof limit === "number" && isFinite(limit) && limit >= 1 ? limit : 0; return new MappingPromiseArray(promises, fn, limit, _filter).promise(); } Promise.prototype.map = function (fn, options) { return map(this, fn, options, null); }; Promise.map = function (promises, fn, options, _filter) { return map(promises, fn, options, _filter); }; };