131 lines
3.2 KiB
JavaScript
131 lines
3.2 KiB
JavaScript
'use strict';
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// This file contains then/promise specific extensions that are only useful
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// for node.js interop
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var Promise = require('./core.js');
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var asap = require('asap');
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module.exports = Promise;
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/* Static Functions */
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Promise.denodeify = function (fn, argumentCount) {
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if (
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typeof argumentCount === 'number' && argumentCount !== Infinity
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) {
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return denodeifyWithCount(fn, argumentCount);
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} else {
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return denodeifyWithoutCount(fn);
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}
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};
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var callbackFn = (
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'function (err, res) {' +
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'if (err) { rj(err); } else { rs(res); }' +
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'}'
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);
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function denodeifyWithCount(fn, argumentCount) {
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var args = [];
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for (var i = 0; i < argumentCount; i++) {
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args.push('a' + i);
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}
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var body = [
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'return function (' + args.join(',') + ') {',
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'var self = this;',
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'return new Promise(function (rs, rj) {',
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'var res = fn.call(',
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['self'].concat(args).concat([callbackFn]).join(','),
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');',
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'if (res &&',
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'(typeof res === "object" || typeof res === "function") &&',
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'typeof res.then === "function"',
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') {rs(res);}',
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'});',
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'};'
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].join('');
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return Function(['Promise', 'fn'], body)(Promise, fn);
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}
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function denodeifyWithoutCount(fn) {
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var fnLength = Math.max(fn.length - 1, 3);
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var args = [];
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for (var i = 0; i < fnLength; i++) {
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args.push('a' + i);
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}
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var body = [
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'return function (' + args.join(',') + ') {',
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'var self = this;',
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'var args;',
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'var argLength = arguments.length;',
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'if (arguments.length > ' + fnLength + ') {',
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'args = new Array(arguments.length + 1);',
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'for (var i = 0; i < arguments.length; i++) {',
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'args[i] = arguments[i];',
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'}',
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'}',
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'return new Promise(function (rs, rj) {',
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'var cb = ' + callbackFn + ';',
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'var res;',
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'switch (argLength) {',
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args.concat(['extra']).map(function (_, index) {
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return (
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'case ' + (index) + ':' +
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'res = fn.call(' + ['self'].concat(args.slice(0, index)).concat('cb').join(',') + ');' +
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'break;'
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);
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}).join(''),
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'default:',
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'args[argLength] = cb;',
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'res = fn.apply(self, args);',
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'}',
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'if (res &&',
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'(typeof res === "object" || typeof res === "function") &&',
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'typeof res.then === "function"',
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') {rs(res);}',
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'});',
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'};'
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].join('');
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return Function(
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['Promise', 'fn'],
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body
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)(Promise, fn);
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}
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Promise.nodeify = function (fn) {
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return function () {
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var args = Array.prototype.slice.call(arguments);
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var callback =
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typeof args[args.length - 1] === 'function' ? args.pop() : null;
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var ctx = this;
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try {
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return fn.apply(this, arguments).nodeify(callback, ctx);
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} catch (ex) {
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if (callback === null || typeof callback == 'undefined') {
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return new Promise(function (resolve, reject) {
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reject(ex);
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});
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} else {
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asap(function () {
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callback.call(ctx, ex);
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})
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}
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}
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}
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};
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Promise.prototype.nodeify = function (callback, ctx) {
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if (typeof callback != 'function') return this;
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this.then(function (value) {
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asap(function () {
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callback.call(ctx, null, value);
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});
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}, function (err) {
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asap(function () {
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callback.call(ctx, err);
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});
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});
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};
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