77 lines
3.1 KiB
JavaScript
77 lines
3.1 KiB
JavaScript
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/**
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* Modified from https://github.com/thenables/thenify
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016-present Exponent
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* Copyright (c) 2014-2016 Jonathan Ong me@jongleberry.com and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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'use strict';
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var BARE_FUNCTION_NAME_REGEX = /([a-z_$][a-z\d_$]*)\]?$/i;
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function promisify(fn, withArrayResult) {
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// The `name` property of a function may have a prefix and a symbol
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// description according to the spec
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var match = BARE_FUNCTION_NAME_REGEX.exec(fn.name);
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var bareName = match ? match[1] : '';
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if (withArrayResult) {
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(function () {
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var originalFn = fn;
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fn = function fn() {
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for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
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args[_key] = arguments[_key];
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}
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var callback = args[args.length - 1];
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args[args.length - 1] = function (err) {
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for (var _len2 = arguments.length, values = Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
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values[_key2 - 1] = arguments[_key2];
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}
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return callback.call(this, err, values);
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};
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return originalFn.apply(this, args);
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};
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})();
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}
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// The wrapper function's source code that we eval refers to this variable
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var $$__fn__$$ = fn;
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return eval(createWrapper(bareName, withArrayResult));
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}
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function createCallback(resolve, reject) {
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return function (err, value) {
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if (err) {
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reject(err);
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} else {
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resolve(value);
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}
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};
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}
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function createWrapper(name, withArrayResult) {
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return '({\n' + (' "' + name + '": function() {\n') + ' var self = this;\n' + ' var length = arguments.length;\n' + ' var args = new Array(length + 1);\n' + ' for (var ii = 0; ii < length; ii++) {\n' + ' args[ii] = arguments[ii];\n' + ' }\n' + ' var lastIndex = ii;\n' + ' return new Promise(function(resolve, reject) {\n' + ' args[lastIndex] = createCallback(resolve, reject);\n' + ' $$__fn__$$.apply(self, args); \n' + ' });\n' + ' }\n' + ('})["' + name + '"]');
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}
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module.exports = promisify;
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