utils.js

(function(ionic) {

  /* for nextUid() function below */
  var uid = ['0','0','0'];

  /**
   * Various utilities used throughout Ionic
   *
   * Some of these are adopted from underscore.js and backbone.js, both also MIT licensed.
   */
  ionic.Utils = {

    arrayMove: function (arr, old_index, new_index) {
      if (new_index >= arr.length) {
        var k = new_index - arr.length;
        while ((k--) + 1) {
          arr.push(undefined);
        }
      }
      arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
      return arr;
    },

    /**
     * Return a function that will be called with the given context
     */
    proxy: function(func, context) {
      var args = Array.prototype.slice.call(arguments, 2);
      return function() {
        return func.apply(context, args.concat(Array.prototype.slice.call(arguments)));
      };
    },

    /**
     * Only call a function once in the given interval.
     *
     * @param func {Function} the function to call
     * @param wait {int} how long to wait before/after to allow function calls
     * @param immediate {boolean} whether to call immediately or after the wait interval
     */
     debounce: function(func, wait, immediate) {
      var timeout, args, context, timestamp, result;
      return function() {
        context = this;
        args = arguments;
        timestamp = new Date();
        var later = function() {
          var last = (new Date()) - timestamp;
          if (last < wait) {
            timeout = setTimeout(later, wait - last);
          } else {
            timeout = null;
            if (!immediate) result = func.apply(context, args);
          }
        };
        var callNow = immediate && !timeout;
        if (!timeout) {
          timeout = setTimeout(later, wait);
        }
        if (callNow) result = func.apply(context, args);
        return result;
      };
    },

    /**
     * Throttle the given fun, only allowing it to be
     * called at most every `wait` ms.
     */
    throttle: function(func, wait, options) {
      var context, args, result;
      var timeout = null;
      var previous = 0;
      options || (options = {});
      var later = function() {
        previous = options.leading === false ? 0 : Date.now();
        timeout = null;
        result = func.apply(context, args);
      };
      return function() {
        var now = Date.now();
        if (!previous && options.leading === false) previous = now;
        var remaining = wait - (now - previous);
        context = this;
        args = arguments;
        if (remaining <= 0) {
          clearTimeout(timeout);
          timeout = null;
          previous = now;
          result = func.apply(context, args);
        } else if (!timeout && options.trailing !== false) {
          timeout = setTimeout(later, remaining);
        }
        return result;
      };
    },
     // Borrowed from Backbone.js's extend
     // Helper function to correctly set up the prototype chain, for subclasses.
     // Similar to `goog.inherits`, but uses a hash of prototype properties and
     // class properties to be extended.
    inherit: function(protoProps, staticProps) {
      var parent = this;
      var child;

      // The constructor function for the new subclass is either defined by you
      // (the "constructor" property in your `extend` definition), or defaulted
      // by us to simply call the parent's constructor.
      if (protoProps && protoProps.hasOwnProperty('constructor')) {
        child = protoProps.constructor;
      } else {
        child = function(){ return parent.apply(this, arguments); };
      }

      // Add static properties to the constructor function, if supplied.
      ionic.extend(child, parent, staticProps);

      // Set the prototype chain to inherit from `parent`, without calling
      // `parent`'s constructor function.
      var Surrogate = function(){ this.constructor = child; };
      Surrogate.prototype = parent.prototype;
      child.prototype = new Surrogate();

      // Add prototype properties (instance properties) to the subclass,
      // if supplied.
      if (protoProps) ionic.extend(child.prototype, protoProps);

      // Set a convenience property in case the parent's prototype is needed
      // later.
      child.__super__ = parent.prototype;

      return child;
    },

    // Extend adapted from Underscore.js
    extend: function(obj) {
       var args = Array.prototype.slice.call(arguments, 1);
       for(var i = 0; i < args.length; i++) {
         var source = args[i];
         if (source) {
           for (var prop in source) {
             obj[prop] = source[prop];
           }
         }
       }
       return obj;
    },

    /**
     * A consistent way of creating unique IDs in angular. The ID is a sequence of alpha numeric
     * characters such as '012ABC'. The reason why we are not using simply a number counter is that
     * the number string gets longer over time, and it can also overflow, where as the nextId
     * will grow much slower, it is a string, and it will never overflow.
     *
     * @returns an unique alpha-numeric string
     */
    nextUid: function() {
      var index = uid.length;
      var digit;

      while(index) {
        index--;
        digit = uid[index].charCodeAt(0);
        if (digit == 57 /*'9'*/) {
          uid[index] = 'A';
          return uid.join('');
        }
        if (digit == 90  /*'Z'*/) {
          uid[index] = '0';
        } else {
          uid[index] = String.fromCharCode(digit + 1);
          return uid.join('');
        }
      }
      uid.unshift('0');
      return uid.join('');
    }
  };

  // Bind a few of the most useful functions to the ionic scope
  ionic.inherit = ionic.Utils.inherit;
  ionic.extend = ionic.Utils.extend;
  ionic.throttle = ionic.Utils.throttle;
  ionic.proxy = ionic.Utils.proxy;
  ionic.debounce = ionic.Utils.debounce;

})(window.ionic);