08-27-周三_17-09-29

node_modules/promise/lib/node-extensions.js

@@ -0,0 +1,63 @@
+'use strict';
+
+//This file contains then/promise specific extensions that are only useful for node.js interop
+
+var Promise = require('./core.js')
+var asap = require('asap')
+
+module.exports = Promise
+
+/* Static Functions */
+
+Promise.denodeify = function (fn, argumentCount) {
+  argumentCount = argumentCount || Infinity
+  return function () {
+    var self = this
+    var args = Array.prototype.slice.call(arguments)
+    return new Promise(function (resolve, reject) {
+      while (args.length && args.length > argumentCount) {
+        args.pop()
+      }
+      args.push(function (err, res) {
+        if (err) reject(err)
+        else resolve(res)
+      })
+      var res = fn.apply(self, args)
+      if (res && (typeof res === 'object' || typeof res === 'function') && typeof res.then === 'function') {
+        resolve(res)
+      }
+    })
+  }
+}
+Promise.nodeify = function (fn) {
+  return function () {
+    var args = Array.prototype.slice.call(arguments)
+    var callback = typeof args[args.length - 1] === 'function' ? args.pop() : null
+    var ctx = this
+    try {
+      return fn.apply(this, arguments).nodeify(callback, ctx)
+    } catch (ex) {
+      if (callback === null || typeof callback == 'undefined') {
+        return new Promise(function (resolve, reject) { reject(ex) })
+      } else {
+        asap(function () {
+          callback.call(ctx, ex)
+        })
+      }
+    }
+  }
+}
+
+Promise.prototype.nodeify = function (callback, ctx) {
+  if (typeof callback != 'function') return this
+
+  this.then(function (value) {
+    asap(function () {
+      callback.call(ctx, null, value)
+    })
+  }, function (err) {
+    asap(function () {
+      callback.call(ctx, err)
+    })
+  })
+}