diff options
Diffstat (limited to 'sandbox/testAppNevena/Front/node_modules/run-async/index.js')
-rw-r--r-- | sandbox/testAppNevena/Front/node_modules/run-async/index.js | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/sandbox/testAppNevena/Front/node_modules/run-async/index.js b/sandbox/testAppNevena/Front/node_modules/run-async/index.js new file mode 100644 index 00000000..c7a2e65d --- /dev/null +++ b/sandbox/testAppNevena/Front/node_modules/run-async/index.js @@ -0,0 +1,98 @@ +'use strict'; + +function isPromise(obj) { + return !!obj && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function'; +} + +/** + * Return a function that will run a function asynchronously or synchronously + * + * example: + * runAsync(wrappedFunction, callback)(...args); + * + * @param {Function} func Function to run + * @param {Function} cb Callback function passed the `func` returned value + * @return {Function(arguments)} Arguments to pass to `func`. This function will in turn + * return a Promise (Node >= 0.12) or call the callbacks. + */ + +var runAsync = module.exports = function (func, cb) { + cb = cb || function () {}; + + return function () { + + var args = arguments; + + var promise = new Promise(function (resolve, reject) { + var resolved = false; + const wrappedResolve = function (value) { + if (resolved) { + console.warn('Run-async promise already resolved.') + } + resolved = true; + resolve(value); + } + + var rejected = false; + const wrappedReject = function (value) { + if (rejected) { + console.warn('Run-async promise already rejected.') + } + rejected = true; + reject(value); + } + + var usingCallback = false; + var callbackConflict = false; + var contextEnded = false; + + var answer = func.apply({ + async: function () { + if (contextEnded) { + console.warn('Run-async async() called outside a valid run-async context, callback will be ignored.'); + return function() {}; + } + if (callbackConflict) { + console.warn('Run-async wrapped function (async) returned a promise.\nCalls to async() callback can have unexpected results.'); + } + usingCallback = true; + return function (err, value) { + if (err) { + wrappedReject(err); + } else { + wrappedResolve(value); + } + }; + } + }, Array.prototype.slice.call(args)); + + if (usingCallback) { + if (isPromise(answer)) { + console.warn('Run-async wrapped function (sync) returned a promise but async() callback must be executed to resolve.'); + } + } else { + if (isPromise(answer)) { + callbackConflict = true; + answer.then(wrappedResolve, wrappedReject); + } else { + wrappedResolve(answer); + } + } + contextEnded = true; + }); + + promise.then(cb.bind(null, null), cb); + + return promise; + } +}; + +runAsync.cb = function (func, cb) { + return runAsync(function () { + var args = Array.prototype.slice.call(arguments); + if (args.length === func.length - 1) { + args.push(this.async()); + } + return func.apply(this, args); + }, cb); +}; |