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keksAccountGUI/node_modulesOLD/thenify/index.js
2019-08-11 20:48:02 +02:00

80 lines
2.2 KiB
JavaScript

var Promise = require('any-promise')
var assert = require('assert')
module.exports = thenify
/**
* Turn async functions into promises
*
* @param {Function} $$__fn__$$
* @return {Function}
* @api public
*/
function thenify($$__fn__$$, options) {
assert(typeof $$__fn__$$ === 'function')
return eval(createWrapper($$__fn__$$.name, options))
}
/**
* Turn async functions into promises and backward compatible with callback
*
* @param {Function} $$__fn__$$
* @return {Function}
* @api public
*/
thenify.withCallback = function ($$__fn__$$, options) {
assert(typeof $$__fn__$$ === 'function')
options = options || {}
options.withCallback = true
if (options.multiArgs === undefined) options.multiArgs = true
return eval(createWrapper($$__fn__$$.name, options))
}
function createCallback(resolve, reject, multiArgs) {
return function(err, value) {
if (err) return reject(err)
var length = arguments.length
if (length <= 2 || !multiArgs) return resolve(value)
if (Array.isArray(multiArgs)) {
var values = {}
for (var i = 1; i < length; i++) values[multiArgs[i - 1]] = arguments[i]
return resolve(values)
}
var values = new Array(length - 1)
for (var i = 1; i < length; ++i) values[i - 1] = arguments[i]
resolve(values)
}
}
function createWrapper(name, options) {
name = (name || '').replace(/\s|bound(?!$)/g, '')
options = options || {}
// default to true
var multiArgs = options.multiArgs !== undefined ? options.multiArgs : true
multiArgs = 'var multiArgs = ' + JSON.stringify(multiArgs) + '\n'
var withCallback = options.withCallback ?
'var lastType = typeof arguments[len - 1]\n'
+ 'if (lastType === "function") return $$__fn__$$.apply(self, arguments)\n'
: ''
return '(function ' + name + '() {\n'
+ 'var self = this\n'
+ 'var len = arguments.length\n'
+ multiArgs
+ withCallback
+ 'var args = new Array(len + 1)\n'
+ 'for (var i = 0; i < len; ++i) args[i] = arguments[i]\n'
+ 'var lastIndex = i\n'
+ 'return new Promise(function (resolve, reject) {\n'
+ 'args[lastIndex] = createCallback(resolve, reject, multiArgs)\n'
+ '$$__fn__$$.apply(self, args)\n'
+ '})\n'
+ '})'
}