Cleaning up core axios a bit

lib/core/InterceptorManager.js

@@ -0,0 +1,53 @@
+'use strict';
+
+var utils = require('./../utils');
+
+function InterceptorManager() {
+  this.handlers = [];
+};
+
+/**
+ * Add a new interceptor to the stack
+ *
+ * @param {Function} fulfilled The function to handle `then` for a `Promise`
+ * @param {Function} rejected The function to handle `reject` for a `Promise`
+ *
+ * @return {Number} An ID used to remove interceptor later
+ */
+InterceptorManager.prototype.use = function (fulfilled, rejected) {
+  this.handlers.push({
+    fulfilled: fulfilled,
+    rejected: rejected
+  });
+  return this.handlers.length - 1;
+};
+
+/**
+ * Remove an interceptor from the stack
+ *
+ * @param {Number} id The ID that was returned by `use`
+ */
+InterceptorManager.prototype.eject = function (id) {
+  if (this.handlers[id]) {
+    this.handlers[id] = null;
+  }
+};
+
+/**
+ * Iterate over all the registered interceptors
+ *
+ * This method is particularly useful for skipping over any
+ * interceptors that may have become `null` calling `remove`.
+ *
+ * @param {Function} fn The function to call for each interceptor
+ */
+InterceptorManager.prototype.forEach = function (fn) {
+  utils.forEach(this.handlers, function (h) {
+    if (h !== null) {
+      fn(h);
+    } 
+  });
+};
+
+module.exports = InterceptorManager;
+