neo4j /community/server/src/main/resources/webadmin-html/js/lib/backbone.js

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//     Underscore.js 1.1.7
//     (c) 2011 Jeremy Ashkenas, DocumentCloud Inc.
//     Underscore is freely distributable under the MIT license.
//     Portions of Underscore are inspired or borrowed from Prototype,
//     Oliver Steele's Functional, and John Resig's Micro-Templating.
//     For all details and documentation:
//     http://documentcloud.github.com/underscore

(function() {

  // Baseline setup
  // --------------

  // Establish the root object, `window` in the browser, or `global` on the server.
  var root = this;

  // Save the previous value of the `_` variable.
  var previousUnderscore = root._;

  // Establish the object that gets returned to break out of a loop iteration.
  var breaker = {};

  // Save bytes in the minified (but not gzipped) version:
  var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;

  // Create quick reference variables for speed access to core prototypes.
  var slice            = ArrayProto.slice,
      unshift          = ArrayProto.unshift,
      toString         = ObjProto.toString,
      hasOwnProperty   = ObjProto.hasOwnProperty;

  // All **ECMAScript 5** native function implementations that we hope to use
  // are declared here.
  var
    nativeForEach      = ArrayProto.forEach,
    nativeMap          = ArrayProto.map,
    nativeReduce       = ArrayProto.reduce,
    nativeReduceRight  = ArrayProto.reduceRight,
    nativeFilter       = ArrayProto.filter,
    nativeEvery        = ArrayProto.every,
    nativeSome         = ArrayProto.some,
    nativeIndexOf      = ArrayProto.indexOf,
    nativeLastIndexOf  = ArrayProto.lastIndexOf,
    nativeIsArray      = Array.isArray,
    nativeKeys         = Object.keys,
    nativeBind         = FuncProto.bind;

  // Create a safe reference to the Underscore object for use below.
  var _ = function(obj) { return new wrapper(obj); };

  // Export the Underscore object for **CommonJS**, with backwards-compatibility
  // for the old `require()` API. If we're not in CommonJS, add `_` to the
  // global object.
  if (typeof module !== 'undefined' && module.exports) {
    module.exports = _;
    _._ = _;
  } else {
    // Exported as a string, for Closure Compiler "advanced" mode.
    root['_'] = _;
  }

  // Current version.
  _.VERSION = '1.1.7';

  // Collection Functions
  // --------------------

  // The cornerstone, an `each` implementation, aka `forEach`.
  // Handles objects with the built-in `forEach`, arrays, and raw objects.
  // Delegates to **ECMAScript 5**'s native `forEach` if available.
  var each = _.each = _.forEach = function(obj, iterator, context) {
    if (obj == null) return;
    if (nativeForEach && obj.forEach === nativeForEach) {
      obj.forEach(iterator, context);
    } else if (obj.length === +obj.length) {
      for (var i = 0, l = obj.length; i < l; i++) {
        if (i in obj && iterator.call(context, obj[i], i, obj) === breaker) return;
      }
    } else {
      for (var key in obj) {
        if (hasOwnProperty.call(obj, key)) {
          if (iterator.call(context, obj[key], key, obj) === breaker) return;
        }
      }
    }
  };

  // Return the results of applying the iterator to each element.
  // Delegates to **ECMAScript 5**'s native `map` if available.
  _.map = function(obj, iterator, context) {
    var results = [];
    if (obj == null) return results;
    if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
    each(obj, function(value, index, list) {
      results[results.length] = iterator.call(context, value, index, list);
    });
    return results;
  };

  // **Reduce** builds up a single result from a list of values, aka `inject`,
  // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
  _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
    var initial = memo !== void 0;
    if (obj == null) obj = [];
    if (nativeReduce && obj.reduce === nativeReduce) {
      if (context) iterator = _.bind(iterator, context);
      return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
    }
    each(obj, function(value, index, list) {
      if (!initial) {
        memo = value;
        initial = true;
      } else {
        memo = iterator.call(context, memo, value, index, list);
      }
    });
    if (!initial) throw new TypeError("Reduce of empty array with no initial value");
    return memo;
  };

  // The right-associative version of reduce, also known as `foldr`.
  // Delegates to **ECMAScript 5**'s native `reduceRight` if available.
  _.reduceRight = _.foldr = function(obj, iterator, memo, context) {
    if (obj == null) obj = [];
    if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
      if (context) iterator = _.bind(iterator, context);
      return memo !== void 0 ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
    }
    var reversed = (_.isArray(obj) ? obj.slice() : _.toArray(obj)).reverse();
    return _.reduce(reversed, iterator, memo, context);
  };

  // Return the first value which passes a truth test. Aliased as `detect`.
  _.find = _.detect = function(obj, iterator, context) {
    var result;
    any(obj, function(value, index, list) {
      if (iterator.call(context, value, index, list)) {
        result = value;
        return true;
      }
    });
    return result;
  };

  // Return all the elements that pass a truth test.
  // Delegates to **ECMAScript 5**'s native `filter` if available.
  // Aliased as `select`.
  _.filter = _.select = function(obj, iterator, context) {
    var results = [];
    if (obj == null) return results;
    if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
    each(obj, function(value, index, list) {
      if (iterator.call(context, value, index, list)) results[results.length] = value;
    });
    return results;
  };

  // Return all the elements for which a truth test fails.
  _.reject = function(obj, iterator, context) {
    var results = [];
    if (obj == null) return results;
    each(obj, function(value, index, list) {
      if (!iterator.call(context, value, index, list)) results[results.length] = value;
    });
    return results;
  };

  // Determine whether all of the elements match a truth test.
  // Delegates to **ECMAScript 5**'s native `every` if available.
  // Aliased as `all`.
  _.every = _.all = function(obj, iterator, context) {
    var result = true;
    if (obj == null) return result;
    if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
    each(obj, function(value, index, list) {
      if (!(result = result && iterator.call(context, value, index, list))) return breaker;
    });
    return result;
  };

  // Determine if at least one element in the object matches a truth test.
  // Delegates to **ECMAScript 5**'s native `some` if available.
  // Aliased as `any`.
  var any = _.some = _.any = function(obj, iterator, context) {
    iterator = iterator || _.identity;
    var result = false;
    if (obj == null) return result;
    if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
    each(obj, function(value, index, list) {
      if (result |= iterator.call(context, value, index, list)) return breaker;
    });
    return !!result;
  };

  // Determine if a given value is included in the array or object using `===`.
  // Aliased as `contains`.
  _.include = _.contains = function(obj, target) {
    var found = false;
    if (obj == null) return found;
    if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
    any(obj, function(value) {
      if (found = value === target) return true;
    });
    return found;
  };

  // Invoke a method (with arguments) on every item in a collection.
  _.invoke = function(obj, method) {
    var args = slice.call(arguments, 2);
    return _.map(obj, function(value) {
      return (method.call ? method || value : value[method]).apply(value, args);
    });
  };

  // Convenience version of a common use case of `map`: fetching a property.
  _.pluck = function(obj, key) {
    return _.map(obj, function(value){ return value[key]; });
  };

  // Return the maximum element or (element-based computation).
  _.max = function(obj, iterator, context) {
    if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
    var result = {computed : -Infinity};
    each(obj, function(value, index, list) {
      var computed = iterator ? iterator.call(context, value, index, list) : value;
      computed >= result.computed && (result = {value : value, computed : computed});
    });
    return result.value;
  };

  // Return the minimum element (or element-based computation).
  _.min = function(obj, iterator, context) {
    if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj);
    var result = {computed : Infinity};
    each(obj, function(value, index, list) {
      var computed = iterator ? iterator.call(context, value, index, list) : value;
      computed < result.computed && (result = {value : value, computed : computed});
    });
    return result.value;
  };

  // Sort the object's values by a criterion produced by an iterator.
  _.sortBy = function(obj, iterator, context) {
    return _.pluck(_.map(obj, function(value, index, list) {
      return {
        value : value,
        criteria : iterator.call(context, value, index, list)
      };
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }), 'value');
  };

  // Groups the object's values by a criterion produced by an iterator
  _.groupBy = function(obj, iterator) {
    var result = {};
    each(obj, function(value, index) {
      var key = iterator(value, index);
      (result[key] || (result[key] = [])).push(value);
    });
    return result;
  };

  // Use a comparator function to figure out at what index an object should
  // be inserted so as to maintain order. Uses binary search.
  _.sortedIndex = function(array, obj, iterator) {
    iterator || (iterator = _.identity);
    var low = 0, high = array.length;
    while (low < high) {
      var mid = (low + high) >> 1;
      iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid;
    }
    return low;
  };

  // Safely convert anything iterable into a real, live array.
  _.toArray = function(iterable) {
    if (!iterable)                return [];
    if (iterable.toArray)         return iterable.toArray();
    if (_.isArray(iterable))      return slice.call(iterable);
    if (_.isArguments(iterable))  return slice.call(iterable);
    return _.values(iterable);
  };

  // Return the number of elements in an object.
  _.size = function(obj) {
    return _.toArray(obj).length;
  };

  // Array Functions
  // ---------------

  // Get the first element of an array. Passing **n** will return the first N
  // values in the array. Aliased as `head`. The **guard** check allows it to work
  // with `_.map`.
  _.first = _.head = function(array, n, guard) {
    return (n != null) && !guard ? slice.call(array, 0, n) : array[0];
  };

  // Returns everything but the first entry of the array. Aliased as `tail`.
  // Especially useful on the arguments object. Passing an **index** will return
  // the rest of the values in the array from that index onward. The **guard**
  // check allows it to work with `_.map`.
  _.rest = _.tail = function(array, index, guard) {
    return slice.call(array, (index == null) || guard ? 1 : index);
  };

  // Get the last element of an array.
  _.last = function(array) {
    return array[array.length - 1];
  };

  // Trim out all falsy values from an array.
  _.compact = function(array) {
    return _.filter(array, function(value){ return !!value; });
  };

  // Return a completely flattened version of an array.
  _.flatten = function(array) {
    return _.reduce(array, function(memo, value) {
      if (_.isArray(value)) return memo.concat(_.flatten(value));
      memo[memo.length] = value;
      return memo;
    }, []);
  };

  // Return a version of the array that does not contain the specified value(s).
  _.without = function(array) {
    return _.difference(array, slice.call(arguments, 1));
  };

  // Produce a duplicate-free version of the array. If the array has already
  // been sorted, you have the option of using a faster algorithm.
  // Aliased as `unique`.
  _.uniq = _.unique = function(array, isSorted, iterator) {
    var initial = iterator ? _.map(array, iterator) : array;
    var result = [];
    _.reduce(initial, function(memo, el, i) {
      if (0 == i || (isSorted === true ? _.last(memo) != el : !_.include(memo, el))) {
        memo[memo.length] = el;
        result[result.length] = array[i];
      }
      return memo;
    }, []);
    return result;
  };

  // Produce an array that contains the union: each distinct element from all of
  // the passed-in arrays.
  _.union = function() {
    return _.uniq(_.flatten(arguments));
  };

  // Produce an array that contains every item shared between all the
  // passed-in arrays. (Aliased as "intersect" for back-compat.)
  _.intersection = _.intersect = function(array) {
    var rest = slice.call(arguments, 1);
    return _.filter(_.uniq(array), function(item) {
      return _.every(rest, function(other) {
        return _.indexOf(other, item) >= 0;
      });
    });
  };

  // Take the difference between one array and another.
  // Only the elements present in just the first array will remain.
  _.difference = function(array, other) {
    return _.filter(array, function(value){ return !_.include(other, value); });
  };

  // Zip together multiple lists into a single array -- elements that share
  // an index go together.
  _.zip = function() {
    var args = slice.call(arguments);
    var length = _.max(_.pluck(args, 'length'));
    var results = new Array(length);
    for (var i = 0; i < length; i++) results[i] = _.pluck(args, "" + i);
    return results;
  };

  // If the browser doesn't supply us with indexOf (I'm looking at you, **MSIE**),
  // we need this function. Return the position of the first occurrence of an
  // item in an array, or -1 if the item is not included in the array.
  // Delegates to **ECMAScript 5**'s native `indexOf` if available.
  // If the array is large and already in sort order, pass `true`
  // for **isSorted** to use binary search.
  _.indexOf = function(array, item, isSorted) {
    if (array == null) return -1;
    var i, l;
    if (isSorted) {
      i = _.sortedIndex(array, item);
      return array[i] === item ? i : -1;
    }
    if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item);
    for (i = 0, l = array.length; i < l; i++) if (array[i] === item) return i;
    return -1;
  };


  // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
  _.lastIndexOf = function(array, item) {
    if (array == null) return -1;
    if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item);
    var i = array.length;
    while (i--) if (array[i] === item) return i;
    return -1;
  };

  // Generate an integer Array containing an arithmetic progression. A port of
  // the native Python `range()` function. See
  // [the Python documentation](http://docs.python.org/library/functions.html#range).
  _.range = function(start, stop, step) {
    if (arguments.length <= 1) {
      stop = start || 0;
      start = 0;
    }
    step = arguments[2] || 1;

    var len = Math.max(Math.ceil((stop - start) / step), 0);
    var idx = 0;
    var range = new Array(len);

    while(idx < len) {
      range[idx++] = start;
      start += step;
    }

    return range;
  };

  // Function (ahem) Functions
  // ------------------

  // Create a function bound to a given object (assigning `this`, and arguments,
  // optionally). Binding with arguments is also known as `curry`.
  // Delegates to **ECMAScript 5**'s native `Function.bind` if available.
  // We check for `func.bind` first, to fail fast when `func` is undefined.
  _.bind = function(func, obj) {
    if (func.bind === nativeBind && nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
    var args = slice.call(arguments, 2);
    return function() {
      return func.apply(obj, args.concat(slice.call(arguments)));
    };
  };

  // Bind all of an object's methods to that object. Useful for ensuring that
  // all callbacks defined on an object belong to it.
  _.bindAll = function(obj) {
    var funcs = slice.call(arguments, 1);
    if (funcs.length == 0) funcs = _.functions(obj);
    each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
    return obj;
  };

  // Memoize an expensive function by storing its results.
  _.memoize = function(func, hasher) {
    var memo = {};
    hasher || (hasher = _.identity);
    return function() {
      var key = hasher.apply(this, arguments);
      return hasOwnProperty.call(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
    };
  };

  // Delays a function for the given number of milliseconds, and then calls
  // it with the arguments supplied.
  _.delay = function(func, wait) {
    var args = slice.call(arguments, 2);
    return setTimeout(function(){ return func.apply(func, args); }, wait);
  };

  // Defers a function, scheduling it to run after the current call stack has
  // cleared.
  _.defer = function(func) {
    return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1)));
  };

  // Internal function used to implement `_.throttle` and `_.debounce`.
  var limit = function(func, wait, debounce) {
    var timeout;
    return function() {
      var context = this, args = arguments;
      var throttler = function() {
        timeout = null;
        func.apply(context, args);
      };
      if (debounce) clearTimeout(timeout);
      if (debounce || !timeout) timeout = setTimeout(throttler, wait);
    };
  };

  // Returns a function, that, when invoked, will only be triggered at most once
  // during a given window of time.
  _.throttle = function(func, wait) {
    return limit(func, wait, false);
  };

  // Returns a function, that, as long as it continues to be invoked, will not
  // be triggered. The function will be called after it stops being called for
  // N milliseconds.
  _.debounce = function(func, wait) {
    return limit(func, wait, true);
  };

  // Returns a function that will be executed at most one time, no matter how
  // often you call it. Useful for lazy initialization.
  _.once = function(func) {
    var ran = false, memo;
    return function() {
      if (ran) return memo;
      ran = true;
      return memo = func.apply(this, arguments);
    };
  };

  // Returns the first function passed as an argument to the second,
  // allowing you to adjust arguments, run code before and after, and
  // conditionally execute the original function.
  _.wrap = function(func, wrapper) {
    return function() {
      var args = [func].concat(slice.call(arguments));
      return wrapper.apply(this, args);
    };
  };

  // Returns a function that is the composition of a list of functions, each
  // consuming the return value of the function that follows.
  _.compose = function() {
    var funcs = slice.call(arguments);
    return function() {
      var args = slice.call(arguments);
      for (var i = funcs.length - 1; i >= 0; i--) {
        args = [funcs[i].apply(this, args)];
      }
      return args[0];
    };
  };

  // Returns a function that will only be executed after being called N times.
  _.after = function(times, func) {
    return function() {
      if (--times < 1) { return func.apply(this, arguments); }
    };
  };


  // Object Functions
  // ----------------

  // Retrieve the names of an object's properties.
  // Delegates to **ECMAScript 5**'s native `Object.keys`
  _.keys = nativeKeys || function(obj) {
    if (obj !== Object(obj)) throw new TypeError('Invalid object');
    var keys = [];
    for (var key in obj) if (hasOwnProperty.call(obj, key)) keys[keys.length] = key;
    return keys;
  };

  // Retrieve the values of an object's properties.
  _.values = function(obj) {
    return _.map(obj, _.identity);
  };

  // Return a sorted list of the function names available on the object.
  // Aliased as `methods`
  _.functions = _.methods = function(obj) {
    var names = [];
    for (var key in obj) {
      if (_.isFunction(obj[key])) names.push(key);
    }
    return names.sort();
  };

  // Extend a given object with all the properties in passed-in object(s).
  _.extend = function(obj) {
    each(slice.call(arguments, 1), function(source) {
      for (var prop in source) {
        if (source[prop] !== void 0) obj[prop] = source[prop];
      }
    });
    return obj;
  };

  // Fill in a given object with default properties.
  _.defaults = function(obj) {
    each(slice.call(arguments, 1), function(source) {
      for (var prop in source) {
        if (obj[prop] == null) obj[prop] = source[prop];
      }
    });
    return obj;
  };

  // Create a (shallow-cloned) duplicate of an object.
  _.clone = function(obj) {
    return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
  };

  // Invokes interceptor with the obj, and then returns obj.
  // The primary purpose of this method is to "tap into" a method chain, in
  // order to perform operations on intermediate results within the chain.
  _.tap = function(obj, interceptor) {
    interceptor(obj);
    return obj;
  };

  // Perform a deep comparison to check if two objects are equal.
  _.isEqual = function(a, b) {
    // Check object identity.
    if (a === b) return true;
    // Different types?
    var atype = typeof(a), btype = typeof(b);
    if (atype != btype) return false;
    // Basic equality test (watch out for coercions).
    if (a == b) return true;
    // One is falsy and the other truthy.
    if ((!a && b) || (a && !b)) return false;
    // Unwrap any wrapped objects.
    if (a._chain) a = a._wrapped;
    if (b._chain) b = b._wrapped;
    // One of them implements an isEqual()?
    if (a.isEqual) return a.isEqual(b);
    if (b.isEqual) return b.isEqual(a);
    // Check dates' integer values.
    if (_.isDate(a) && _.isDate(b)) return a.getTime() === b.getTime();
    // Both are NaN?
    if (_.isNaN(a) && _.isNaN(b)) return false;
    // Compare regular expressions.
    if (_.isRegExp(a) && _.isRegExp(b))
      return a.source     === b.source &&
             a.global     === b.global &&
             a.ignoreCase === b.ignoreCase &&
             a.multiline  === b.multiline;
    // If a is not an object by this point, we can't handle it.
    if (atype !== 'object') return false;
    // Check for different array lengths before comparing contents.
    if (a.length && (a.length !== b.length)) return false;
    // Nothing else worked, deep compare the contents.
    var aKeys = _.keys(a), bKeys = _.keys(b);
    // Different object sizes?
    if (aKeys.length != bKeys.length) return false;
    // Recursive comparison of contents.
    for (var key in a) if (!(key in b) || !_.isEqual(a[key], b[key])) return false;
    return true;
  };

  // Is a given array or object empty?
  _.isEmpty = function(obj) {
    if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
    for (var key in obj) if (hasOwnProperty.call(obj, key)) return false;
    return true;
  };

  // Is a given value a DOM element?
  _.isElement = function(obj) {
    return !!(obj && obj.nodeType == 1);
  };

  // Is a given value an array?
  // Delegates to ECMA5's native Array.isArray
  _.isArray = nativeIsArray || function(obj) {
    return toString.call(obj) === '[object Array]';
  };

  // Is a given variable an object?
  _.isObject = function(obj) {
    return obj === Object(obj);
  };

  // Is a given variable an arguments object?
  _.isArguments = function(obj) {
    return !!(obj && hasOwnProperty.call(obj, 'callee'));
  };

  // Is a given value a function?
  _.isFunction = function(obj) {
    return !!(obj && obj.constructor && obj.call && obj.apply);
  };

  // Is a given value a string?
  _.isString = function(obj) {
    return !!(obj === '' || (obj && obj.charCodeAt && obj.substr));
  };

  // Is a given value a number?
  _.isNumber = function(obj) {
    return !!(obj === 0 || (obj && obj.toExponential && obj.toFixed));
  };

  // Is the given value `NaN`? `NaN` happens to be the only value in JavaScript
  // that does not equal itself.
  _.isNaN = function(obj) {
    return obj !== obj;
  };

  // Is a given value a boolean?
  _.isBoolean = function(obj) {
    return obj === true || obj === false;
  };

  // Is a given value a date?
  _.isDate = function(obj) {
    return !!(obj && obj.getTimezoneOffset && obj.setUTCFullYear);
  };

  // Is the given value a regular expression?
  _.isRegExp = function(obj) {
    return !!(obj && obj.test && obj.exec && (obj.ignoreCase || obj.ignoreCase === false));
  };

  // Is a given value equal to null?
  _.isNull = function(obj) {
    return obj === null;
  };

  // Is a given variable undefined?
  _.isUndefined = function(obj) {
    return obj === void 0;
  };

  // Utility Functions
  // -----------------

  // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
  // previous owner. Returns a reference to the Underscore object.
  _.noConflict = function() {
    root._ = previousUnderscore;
    return this;
  };

  // Keep the identity function around for default iterators.
  _.identity = function(value) {
    return value;
  };

  // Run a function **n** times.
  _.times = function (n, iterator, context) {
    for (var i = 0; i < n; i++) iterator.call(context, i);
  };

  // Add your own custom functions to the Underscore object, ensuring that
  // they're correctly added to the OOP wrapper as well.
  _.mixin = function(obj) {
    each(_.functions(obj), function(name){
      addToWrapper(name, _[name] = obj[name]);
    });
  };

  // Generate a unique integer id (unique within the entire client session).
  // Useful for temporary DOM ids.
  var idCounter = 0;
  _.uniqueId = function(prefix) {
    var id = idCounter++;
    return prefix ? prefix + id : id;
  };

  // By default, Underscore uses ERB-style template delimiters, change the
  // following template settings to use alternative delimiters.
  _.templateSettings = {
    evaluate    : /<%([\s\S]+?)%>/g,
    interpolate : /<%=([\s\S]+?)%>/g
  };

  // JavaScript micro-templating, similar to John Resig's implementation.
  // Underscore templating handles arbitrary delimiters, preserves whitespace,
  // and correctly escapes quotes within interpolated code.
  _.template = function(str, data) {
    var c  = _.templateSettings;
    var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' +
      'with(obj||{}){__p.push(\'' +
      str.replace(/\\/g, '\\\\')
         .replace(/'/g, "\\'")
         .replace(c.interpolate, function(match, code) {
           return "'," + code.replace(/\\'/g, "'") + ",'";
         })
         .replace(c.evaluate || null, function(match, code) {
           return "');" + code.replace(/\\'/g, "'")
                              .replace(/[\r\n\t]/g, ' ') + "__p.push('";
         })
         .replace(/\r/g, '\\r')
         .replace(/\n/g, '\\n')
         .replace(/\t/g, '\\t')
         + "');}return __p.join('');";
    var func = new Function('obj', tmpl);
    return data ? func(data) : func;
  };

  // The OOP Wrapper
  // ---------------

  // If Underscore is called as a function, it returns a wrapped object that
  // can be used OO-style. This wrapper holds altered versions of all the
  // underscore functions. Wrapped objects may be chained.
  var wrapper = function(obj) { this._wrapped = obj; };

  // Expose `wrapper.prototype` as `_.prototype`
  _.prototype = wrapper.prototype;

  // Helper function to continue chaining intermediate results.
  var result = function(obj, chain) {
    return chain ? _(obj).chain() : obj;
  };

  // A method to easily add functions to the OOP wrapper.
  var addToWrapper = function(name, func) {
    wrapper.prototype[name] = function() {
      var args = slice.call(arguments);
      unshift.call(args, this._wrapped);
      return result(func.apply(_, args), this._chain);
    };
  };

  // Add all of the Underscore functions to the wrapper object.
  _.mixin(_);

  // Add all mutator Array functions to the wrapper.
  each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
    var method = ArrayProto[name];
    wrapper.prototype[name] = function() {
      method.apply(this._wrapped, arguments);
      return result(this._wrapped, this._chain);
    };
  });

  // Add all accessor Array functions to the wrapper.
  each(['concat', 'join', 'slice'], function(name) {
    var method = ArrayProto[name];
    wrapper.prototype[name] = function() {
      return result(method.apply(this._wrapped, arguments), this._chain);
    };
  });

  // Start chaining a wrapped Underscore object.
  wrapper.prototype.chain = function() {
    this._chain = true;
    return this;
  };

  // Extracts the result from a wrapped and chained object.
  wrapper.prototype.value = function() {
    return this._wrapped;
  };

})();


//     Backbone.js 0.5.3
//     (c) 2010 Jeremy Ashkenas, DocumentCloud Inc.
//     Backbone may be freely distributed under the MIT license.
//     For all details and documentation:
//     http://documentcloud.github.com/backbone

(function(){

  // Initial Setup
  // -------------

  // Save a reference to the global object.
  var root = this;

  // Save the previous value of the `Backbone` variable.
  var previousBackbone = root.Backbone;

  // The top-level namespace. All public Backbone classes and modules will
  // be attached to this. Exported for both CommonJS and the browser.
  var Backbone;
  if (typeof exports !== 'undefined') {
    Backbone = exports;
  } else {
    Backbone = root.Backbone = {};
  }

  // Current version of the library. Keep in sync with `package.json`.
  Backbone.VERSION = '0.5.3';

  // Require Underscore, if we're on the server, and it's not already present.
  var _ = root._;
  if (!_ && (typeof require !== 'undefined')) _ = require('underscore')._;

  // For Backbone's purposes, jQuery or Zepto owns the `$` variable.
  // Commented out, because jQuery is sometimes not defined at this point
  //var $ = root.jQuery || root.Zepto;

  // Runs Backbone.js in *noConflict* mode, returning the `Backbone` variable
  // to its previous owner. Returns a reference to this Backbone object.
  Backbone.noConflict = function() {
    root.Backbone = previousBackbone;
    return this;
  };

  // Turn on `emulateHTTP` to support legacy HTTP servers. Setting this option will
  // fake `"PUT"` and `"DELETE"` requests via the `_method` parameter and set a
  // `X-Http-Method-Override` header.
  Backbone.emulateHTTP = false;

  // Turn on `emulateJSON` to support legacy servers that can't deal with direct
  // `application/json` requests ... will encode the body as
  // `application/x-www-form-urlencoded` instead and will send the model in a
  // form param named `model`.
  Backbone.emulateJSON = false;

  // Backbone.Events
  // -----------------

  // A module that can be mixed in to *any object* in order to provide it with
  // custom events. You may `bind` or `unbind` a callback function to an event;
  // `trigger`-ing an event fires all callbacks in succession.
  //
  //     var object = {};
  //     _.extend(object, Backbone.Events);
  //     object.bind('expand', function(){ alert('expanded'); });
  //     object.trigger('expand');
  //
  Backbone.Events = {

    // Bind an event, specified by a string name, `ev`, to a `callback` function.
    // Passing `"all"` will bind the callback to all events fired.
    bind : function(ev, callback, context) {
      var calls = this._callbacks || (this._callbacks = {});
      var list  = calls[ev] || (calls[ev] = []);
      list.push([callback, context]);
      return this;
    },

    // Remove one or many callbacks. If `callback` is null, removes all
    // callbacks for the event. If `ev` is null, removes all bound callbacks
    // for all events.
    unbind : function(ev, callback) {
      var calls;
      if (!ev) {
        this._callbacks = {};
      } else if (calls = this._callbacks) {
        if (!callback) {
          calls[ev] = [];
        } else {
          var list = calls[ev];
          if (!list) return this;
          for (var i = 0, l = list.length; i < l; i++) {
            if (list[i] && callback === list[i][0]) {
              list[i] = null;
              break;
            }
          }
        }
      }
      return this;
    },

    // Trigger an event, firing all bound callbacks. Callbacks are passed the
    // same arguments as `trigger` is, apart from the event name.
    // Listening for `"all"` passes the true event name as the first argument.
    trigger : function(eventName) {
      var list, calls, ev, callback, args;
      var both = 2;
      if (!(calls = this._callbacks)) return this;
      while (both--) {
        ev = both ? eventName : 'all';
        if (list = calls[ev]) {
          for (var i = 0, l = list.length; i < l; i++) {
            if (!(callback = list[i])) {
              list.splice(i, 1); i--; l--;
            } else {
              args = both ? Array.prototype.slice.call(arguments, 1) : arguments;
              callback[0].apply(callback[1] || this, args);
            }
          }
        }
      }
      return this;
    }

  };

  // Backbone.Model
  // --------------

  // Create a new model, with defined attributes. A client id (`cid`)
  // is automatically generated and assigned for you.
  Backbone.Model = function(attributes, options) {
    var defaults;
    attributes || (attributes = {});
    if (defaults = this.defaults) {
      if (_.isFunction(defaults)) defaults = defaults.call(this);
      attributes = _.extend({}, defaults, attributes);
    }
    this.attributes = {};
    this._escapedAttributes = {};
    this.cid = _.uniqueId('c');
    this.set(attributes, {silent : true});
    this._changed = false;
    this._previousAttributes = _.clone(this.attributes);
    if (options && options.collection) this.collection = options.collection;
    this.initialize(attributes, options);
  };

  // Attach all inheritable methods to the Model prototype.
  _.extend(Backbone.Model.prototype, Backbone.Events, {

    // A snapshot of the model's previous attributes, taken immediately
    // after the last `"change"` event was fired.
    _previousAttributes : null,

    // Has the item been changed since the last `"change"` event?
    _changed : false,

    // The default name for the JSON `id` attribute is `"id"`. MongoDB and
    // CouchDB users may want to set this to `"_id"`.
    idAttribute : 'id',

    // Initialize is an empty function by default. Override it with your own
    // initialization logic.
    initialize : function(){},

    // Return a copy of the model's `attributes` object.
    toJSON : function() {
      return _.clone(this.attributes);
    },

    // Get the value of an attribute.
    get : function(attr) {
      return this.attributes[attr];
    },

    // Get the HTML-escaped value of an attribute.
    escape : function(attr) {
      var html;
      if (html = this._escapedAttributes[attr]) return html;
      var val = this.attributes[attr];
      return this._escapedAttributes[attr] = escapeHTML(val == null ? '' : '' + val);
    },

    // Returns `true` if the attribute contains a value that is not null
    // or undefined.
    has : function(attr) {
      return this.attributes[attr] != null;
    },

    // Set a hash of model attributes on the object, firing `"change"` unless you
    // choose to silence it.
    set : function(attrs, options) {

      // Extract attributes and options.
      options || (options = {});
      if (!attrs) return this;
      if (attrs.attributes) attrs = attrs.attributes;
      var now = this.attributes, escaped = this._escapedAttributes;

      // Run validation.
      if (!options.silent && this.validate && !this._performValidation(attrs, options)) return false;

      // Check for changes of `id`.
      if (this.idAttribute in attrs) this.id = attrs[this.idAttribute];

      // We're about to start triggering change events.
      var alreadyChanging = this._changing;
      this._changing = true;

      // Update attributes.
      for (var attr in attrs) {
        var val = attrs[attr];
        if (!_.isEqual(now[attr], val)) {
          now[attr] = val;
          delete escaped[attr];
          this._changed = true;
          if (!options.silent) this.trigger('change:' + attr, this, val, options);
        }
      }

      // Fire the `"change"` event, if the model has been changed.
      if (!alreadyChanging && !options.silent && this._changed) this.change(options);
      this._changing = false;
      return this;
    },

    // Remove an attribute from the model, firing `"change"` unless you choose
    // to silence it. `unset` is a noop if the attribute doesn't exist.
    unset : function(attr, options) {
      if (!(attr in this.attributes)) return this;
      options || (options = {});
      var value = this.attributes[attr];

      // Run validation.
      var validObj = {};
      validObj[attr] = void 0;
      if (!options.silent && this.validate && !this._performValidation(validObj, options)) return false;

      // Remove the attribute.
      delete this.attributes[attr];
      delete this._escapedAttributes[attr];
      if (attr == this.idAttribute) delete this.id;
      this._changed = true;
      if (!options.silent) {
        this.trigger('change:' + attr, this, void 0, options);
        this.change(options);
      }
      return this;
    },

    // Clear all attributes on the model, firing `"change"` unless you choose
    // to silence it.
    clear : function(options) {
      options || (options = {});
      var attr;
      var old = this.attributes;

      // Run validation.
      var validObj = {};
      for (attr in old) validObj[attr] = void 0;
      if (!options.silent && this.validate && !this._performValidation(validObj, options)) return false;

      this.attributes = {};
      this._escapedAttributes = {};
      this._changed = true;
      if (!options.silent) {
        for (attr in old) {
          this.trigger('change:' + attr, this, void 0, options);
        }
        this.change(options);
      }
      return this;
    },

    // Fetch the model from the server. If the server's representation of the
    // model differs from its current attributes, they will be overriden,
    // triggering a `"change"` event.
    fetch : function(options) {
      options || (options = {});
      var model = this;
      var success = options.success;
      options.success = function(resp, status, xhr) {
        if (!model.set(model.parse(resp, xhr), options)) return false;
        if (success) success(model, resp);
      };
      options.error = wrapError(options.error, model, options);
      return (this.sync || Backbone.sync).call(this, 'read', this, options);
    },

    // Set a hash of model attributes, and sync the model to the server.
    // If the server returns an attributes hash that differs, the model's
    // state will be `set` again.
    save : function(attrs, options) {
      options || (options = {});
      if (attrs && !this.set(attrs, options)) return false;
      var model = this;
      var success = options.success;
      options.success = function(resp, status, xhr) {
        if (!model.set(model.parse(resp, xhr), options)) return false;
        if (success) success(model, resp, xhr);
      };
      options.error = wrapError(options.error, model, options);
      var method = this.isNew() ? 'create' : 'update';
      return (this.sync || Backbone.sync).call(this, method, this, options);
    },

    // Destroy this model on the server if it was already persisted. Upon success, the model is removed
    // from its collection, if it has one.
    destroy : function(options) {
      options || (options = {});
      if (this.isNew()) return this.trigger('destroy', this, this.collection, options);
      var model = this;
      var success = options.success;
      options.success = function(resp) {
        model.trigger('destroy', model, model.collection, options);
        if (success) success(model, resp);
      };
      options.error = wrapError(options.error, model, options);
      return (this.sync || Backbone.sync).call(this, 'delete', this, options);
    },

    // Default URL for the model's representation on the server -- if you're
    // using Backbone's restful methods, override this to change the endpoint
    // that will be called.
    url : function() {
      var base = getUrl(this.collection) || this.urlRoot || urlError();
      if (this.isNew()) return base;
      return base + (base.charAt(base.length - 1) == '/' ? '' : '/') + encodeURIComponent(this.id);
    },

    // **parse** converts a response into the hash of attributes to be `set` on
    // the model. The default implementation is just to pass the response along.
    parse : function(resp, xhr) {
      return resp;
    },

    // Create a new model with identical attributes to this one.
    clone : function() {
      return new this.constructor(this);
    },

    // A model is new if it has never been saved to the server, and lacks an id.
    isNew : function() {
      return this.id == null;
    },

    // Call this method to manually fire a `change` event for this model.
    // Calling this will cause all objects observing the model to update.
    change : function(options) {
      this.trigger('change', this, options);
      this._previousAttributes = _.clone(this.attributes);
      this._changed = false;
    },

    // Determine if the model has changed since the last `"change"` event.
    // If you specify an attribute name, determine if that attribute has changed.
    hasChanged : function(attr) {
      if (attr) return this._previousAttributes[attr] != this.attributes[attr];
      return this._changed;
    },

    // Return an object containing all the attributes that have changed, or false
    // if there are no changed attributes. Useful for determining what parts of a
    // view need to be updated and/or what attributes need to be persisted to
    // the server.
    changedAttributes : function(now) {
      now || (now = this.attributes);
      var old = this._previousAttributes;
      var changed = false;
      for (var attr in now) {
        if (!_.isEqual(old[attr], now[attr])) {
          changed = changed || {};
          changed[attr] = now[attr];
        }
      }
      return changed;
    },

    // Get the previous value of an attribute, recorded at the time the last
    // `"change"` event was fired.
    previous : function(attr) {
      if (!attr || !this._previousAttributes) return null;
      return this._previousAttributes[attr];
    },

    // Get all of the attributes of the model at the time of the previous
    // `"change"` event.
    previousAttributes : function() {
      return _.clone(this._previousAttributes);
    },

    // Run validation against a set of incoming attributes, returning `true`
    // if all is well. If a specific `error` callback has been passed,
    // call that instead of firing the general `"error"` event.
    _performValidation : function(attrs, options) {
      var error = this.validate(attrs);
      if (error) {
        if (options.error) {
          options.error(this, error, options);
        } else {
          this.trigger('error', this, error, options);
        }
        return false;
      }
      return true;
    }

  });

  // Backbone.Collection
  // -------------------

  // Provides a standard collection class for our sets of models, ordered
  // or unordered. If a `comparator` is specified, the Collection will maintain
  // its models in sort order, as they're added and removed.
  Backbone.Collection = function(models, options) {
    options || (options = {});
    if (options.comparator) this.comparator = options.comparator;
    _.bindAll(this, '_onModelEvent', '_removeReference');
    this._reset();
    if (models) this.reset(models, {silent: true});
    this.initialize.apply(this, arguments);
  };

  // Define the Collection's inheritable methods.
  _.extend(Backbone.Collection.prototype, Backbone.Events, {

    // The default model for a collection is just a **Backbone.Model**.
    // This should be overridden in most cases.
    model : Backbone.Model,

    // Initialize is an empty function by default. Override it with your own
    // initialization logic.
    initialize : function(){},

    // The JSON representation of a Collection is an array of the
    // models' attributes.
    toJSON : function() {
      return this.map(function(model){ return model.toJSON(); });
    },

    // Add a model, or list of models to the set. Pass **silent** to avoid
    // firing the `added` event for every new model.
    add : function(models, options) {
      if (_.isArray(models)) {
        for (var i = 0, l = models.length; i < l; i++) {
          this._add(models[i], options);
        }
      } else {
        this._add(models, options);
      }
      return this;
    },

    // Remove a model, or a list of models from the set. Pass silent to avoid
    // firing the `removed` event for every model removed.
    remove : function(models, options) {
      if (_.isArray(models)) {
        for (var i = 0, l = models.length; i < l; i++) {
          this._remove(models[i], options);
        }
      } else {
        this._remove(models, options);
      }
      return this;
    },

    // Get a model from the set by id.
    get : function(id) {
      if (id == null) return null;
      return this._byId[id.id != null ? id.id : id];
    },

    // Get a model from the set by client id.
    getByCid : function(cid) {
      return cid && this._byCid[cid.cid || cid];
    },

    // Get the model at the given index.
    at: function(index) {
      return this.models[index];
    },

    // Force the collection to re-sort itself. You don't need to call this under normal
    // circumstances, as the set will maintain sort order as each item is added.
    sort : function(options) {
      options || (options = {});
      if (!this.comparator) throw new Error('Cannot sort a set without a comparator');
      this.models = this.sortBy(this.comparator);
      if (!options.silent) this.trigger('reset', this, options);
      return this;
    },

    // Pluck an attribute from each model in the collection.
    pluck : function(attr) {
      return _.map(this.models, function(model){ return model.get(attr); });
    },

    // When you have more items than you want to add or remove individually,
    // you can reset the entire set with a new list of models, without firing
    // any `added` or `removed` events. Fires `reset` when finished.
    reset : function(models, options) {
      models  || (models = []);
      options || (options = {});
      this.each(this._removeReference);
      this._reset();
      this.add(models, {silent: true});
      if (!options.silent) this.trigger('reset', this, options);
      return this;
    },

    // Fetch the default set of models for this collection, resetting the
    // collection when they arrive. If `add: true` is passed, appends the
    // models to the collection instead of resetting.
    fetch : function(options) {
      options || (options = {});
      var collection = this;
      var success = options.success;
      options.success = function(resp, status, xhr) {
        collection[options.add ? 'add' : 'reset'](collection.parse(resp, xhr), options);
        if (success) success(collection, resp);
      };
      options.error = wrapError(options.error, collection, options);
      return (this.sync || Backbone.sync).call(this, 'read', this, options);
    },

    // Create a new instance of a model in this collection. After the model
    // has been created on the server, it will be added to the collection.
    // Returns the model, or 'false' if validation on a new model fails.
    create : function(model, options) {
      var coll = this;
      options || (options = {});
      model = this._prepareModel(model, options);
      if (!model) return false;
      var success = options.success;
      options.success = function(nextModel, resp, xhr) {
        coll.add(nextModel, options);
        if (success) success(nextModel, resp, xhr);
      };
      model.save(null, options);
      return model;
    },

    // **parse** converts a response into a list of models to be added to the
    // collection. The default implementation is just to pass it through.
    parse : function(resp, xhr) {
      return resp;
    },

    // Proxy to _'s chain. Can't be proxied the same way the rest of the
    // underscore methods are proxied because it relies on the underscore
    // constructor.
    chain: function () {
      return _(this.models).chain();
    },

    // Reset all internal state. Called when the collection is reset.
    _reset : function(options) {
      this.length = 0;
      this.models = [];
      this._byId  = {};
      this._byCid = {};
    },

    // Prepare a model to be added to this collection
    _prepareModel: function(model, options) {
      if (!(model instanceof Backbone.Model)) {
        var attrs = model;
        model = new this.model(attrs, {collection: this});
        if (model.validate && !model._performValidation(attrs, options)) model = false;
      } else if (!model.collection) {
        model.collection = this;
      }
      return model;
    },

    // Internal implementation of adding a single model to the set, updating
    // hash indexes for `id` and `cid` lookups.
    // Returns the model, or 'false' if validation on a new model fails.
    _add : function(model, options) {
      options || (options = {});
      model = this._prepareModel(model, options);
      if (!model) return false;
      var already = this.getByCid(model);
      if (already) throw new Error(["Can't add the same model to a set twice", already.id]);
      this._byId[model.id] = model;
      this._byCid[model.cid] = model;
      var index = options.at != null ? options.at :
                  this.comparator ? this.sortedIndex(model, this.comparator) :
                  this.length;
      this.models.splice(index, 0, model);
      model.bind('all', this._onModelEvent);
      this.length++;
      if (!options.silent) model.trigger('add', model, this, options);
      return model;
    },

    // Internal implementation of removing a single model from the set, updating
    // hash indexes for `id` and `cid` lookups.
    _remove : function(model, options) {
      options || (options = {});
      model = this.getByCid(model) || this.get(model);
      if (!model) return null;
      delete this._byId[model.id];
      delete this._byCid[model.cid];
      this.models.splice(this.indexOf(model), 1);
      this.length--;
      if (!options.silent) model.trigger('remove', model, this, options);
      this._removeReference(model);
      return model;
    },

    // Internal method to remove a model's ties to a collection.
    _removeReference : function(model) {
      if (this == model.collection) {
        delete model.collection;
      }
      model.unbind('all', this._onModelEvent);
    },

    // Internal method called every time a model in the set fires an event.
    // Sets need to update their indexes when models change ids. All other
    // events simply proxy through. "add" and "remove" events that originate
    // in other collections are ignored.
    _onModelEvent : function(ev, model, collection, options) {
      if ((ev == 'add' || ev == 'remove') && collection != this) return;
      if (ev == 'destroy') {
        this._remove(model, options);
      }
      if (model && ev === 'change:' + model.idAttribute) {
        delete this._byId[model.previous(model.idAttribute)];
        this._byId[model.id] = model;
      }
      this.trigger.apply(this, arguments);
    }

  });

  // Underscore methods that we want to implement on the Collection.
  var methods = ['forEach', 'each', 'map', 'reduce', 'reduceRight', 'find', 'detect',
    'filter', 'select', 'reject', 'every', 'all', 'some', 'any', 'include',
    'contains', 'invoke', 'max', 'min', 'sortBy', 'sortedIndex', 'toArray', 'size',
    'first', 'rest', 'last', 'without', 'indexOf', 'lastIndexOf', 'isEmpty', 'groupBy'];

  // Mix in each Underscore method as a proxy to `Collection#models`.
  _.each(methods, function(method) {
    Backbone.Collection.prototype[method] = function() {
      return _[method].apply(_, [this.models].concat(_.toArray(arguments)));
    };
  });

  // Backbone.Router
  // -------------------

  // Routers map faux-URLs to actions, and fire events when routes are
  // matched. Creating a new one sets its `routes` hash, if not set statically.
  Backbone.Router = function(options) {
    options || (options = {});
    if (options.routes) this.routes = options.routes;
    this._bindRoutes();
    this.initialize.apply(this, arguments);
  };

  // Cached regular expressions for matching named param parts and splatted
  // parts of route strings.
  var namedParam    = /:([\w\d]+)/g;
  var splatParam    = /\*([\w\d]+)/g;
  var escapeRegExp  = /[-[\]{}()+?.,\\^$|#\s]/g;

  // Set up all inheritable **Backbone.Router** properties and methods.
  _.extend(Backbone.Router.prototype, Backbone.Events, {

    // Initialize is an empty function by default. Override it with your own
    // initialization logic.
    initialize : function(){},

    // Manually bind a single named route to a callback. For example:
    //
    //     this.route('search/:query/p:num', 'search', function(query, num) {
    //       ...
    //     });
    //
    route : function(route, name, callback) {
      Backbone.history || (Backbone.history = new Backbone.History);
      if (!_.isRegExp(route)) route = this._routeToRegExp(route);
      Backbone.history.route(route, _.bind(function(fragment) {
        var args = this._extractParameters(route, fragment);
        callback.apply(this, args);
        this.trigger.apply(this, ['route:' + name].concat(args));
      }, this));
    },

    // Simple proxy to `Backbone.history` to save a fragment into the history.
    navigate : function(fragment, triggerRoute) {
      Backbone.history.navigate(fragment, triggerRoute);
    },

    // Bind all defined routes to `Backbone.history`. We have to reverse the
    // order of the routes here to support behavior where the most general
    // routes can be defined at the bottom of the route map.
    _bindRoutes : function() {
      if (!this.routes) return;
      var routes = [];
      for (var route in this.routes) {
        routes.unshift([route, this.routes[route]]);
      }
      for (var i = 0, l = routes.length; i < l; i++) {
        this.route(routes[i][0], routes[i][1], this[routes[i][1]]);
      }
    },

    // Convert a route string into a regular expression, suitable for matching
    // against the current location hash.
    _routeToRegExp : function(route) {
      route = route.replace(escapeRegExp, "\\$&")
                   .replace(namedParam, "([^\/]*)")
                   .replace(splatParam, "(.*?)");
      return new RegExp('^' + route + '$');
    },

    // Given a route, and a URL fragment that it matches, return the array of
    // extracted parameters.
    _extractParameters : function(route, fragment) {
      return route.exec(fragment).slice(1);
    }

  });

  // Backbone.History
  // ----------------

  // Handles cross-browser history management, based on URL fragments. If the
  // browser does not support `onhashchange`, falls back to polling.
  Backbone.History = function() {
    this.handlers = [];
    _.bindAll(this, 'checkUrl');
  };

  // Cached regex for cleaning hashes.
  var hashStrip = /^#*/;

  // Cached regex for detecting MSIE.
  var isExplorer = /msie [\w.]+/;

  // Has the history handling already been started?
  var historyStarted = false;

  // Set up all inheritable **Backbone.History** properties and methods.
  _.extend(Backbone.History.prototype, {

    // The default interval to poll for hash changes, if necessary, is
    // twenty times a second.
    interval: 50,

    // Get the cross-browser normalized URL fragment, either from the URL,
    // the hash, or the override.
    getFragment : function(fragment, forcePushState) {
      if (fragment == null) {
        if (this._hasPushState || forcePushState) {
          fragment = window.location.pathname;
          var search = window.location.search;
          if (search) fragment += search;
          if (fragment.indexOf(this.options.root) == 0) fragment = fragment.substr(this.options.root.length);
        } else {
          fragment = window.location.hash;
        }
      }
      return decodeURIComponent(fragment.replace(hashStrip, ''));
    },

    // Start the hash change handling, returning `true` if the current URL matches
    // an existing route, and `false` otherwise.
    start : function(options) {

      // Figure out the initial configuration. Do we need an iframe?
      // Is pushState desired ... is it available?
      if (historyStarted) throw new Error("Backbone.history has already been started");
      this.options          = _.extend({}, {root: '/'}, this.options, options);
      this._wantsPushState  = !!this.options.pushState;
      this._hasPushState    = !!(this.options.pushState && window.history && window.history.pushState);
      var fragment          = this.getFragment();
      var docMode           = document.documentMode;
      var oldIE             = (isExplorer.exec(navigator.userAgent.toLowerCase()) && (!docMode || docMode <= 7));
      if (oldIE) {
        this.iframe = $('<iframe src="javascript:0" tabindex="-1" />').hide().appendTo('body')[0].contentWindow;
        this.navigate(fragment);
      }

      // Depending on whether we're using pushState or hashes, and whether
      // 'onhashchange' is supported, determine how we check the URL state.
      if (this._hasPushState) {
        $(window).bind('popstate', this.checkUrl);
      } else if ('onhashchange' in window && !oldIE) {
        $(window).bind('hashchange', this.checkUrl);
      } else {
        setInterval(this.checkUrl, this.interval);
      }

      // Determine if we need to change the base url, for a pushState link
      // opened by a non-pushState browser.
      this.fragment = fragment;
      historyStarted = true;
      var loc = window.location;
      var atRoot  = loc.pathname == this.options.root;
      if (this._wantsPushState && !this._hasPushState && !atRoot) {
        this.fragment = this.getFragment(null, true);
        window.location.replace(this.options.root + '#' + this.fragment);
        // Return immediately as browser will do redirect to new url
        return true;
      } else if (this._wantsPushState && this._hasPushState && atRoot && loc.hash) {
        this.fragment = loc.hash.replace(hashStrip, '');
        window.history.replaceState({}, document.title, loc.protocol + '//' + loc.host + this.options.root + this.fragment);
      }

      if (!this.options.silent) {
        return this.loadUrl();
      }
    },

    // Add a route to be tested when the fragment changes. Routes added later may
    // override previous routes.
    route : function(route, callback) {
      this.handlers.unshift({route : route, callback : callback});
    },

    // Checks the current URL to see if it has changed, and if it has,
    // calls `loadUrl`, normalizing across the hidden iframe.
    checkUrl : function(e) {
      var current = this.getFragment();
      if (current == this.fragment && this.iframe) current = this.getFragment(this.iframe.location.hash);
      if (current == this.fragment || current == decodeURIComponent(this.fragment)) return false;
      if (this.iframe) this.navigate(current);
      this.loadUrl() || this.loadUrl(window.location.hash);
    },

    // Attempt to load the current URL fragment. If a route succeeds with a
    // match, returns `true`. If no defined routes matches the fragment,
    // returns `false`.
    loadUrl : function(fragmentOverride) {
      var fragment = this.fragment = this.getFragment(fragmentOverride);
      var matched = _.any(this.handlers, function(handler) {
        if (handler.route.test(fragment)) {
          handler.callback(fragment);
          return true;
        }
      });
      return matched;
    },

    // Save a fragment into the hash history. You are responsible for properly
    // URL-encoding the fragment in advance. This does not trigger
    // a `hashchange` event.
    navigate : function(fragment, triggerRoute) {
      var frag = (fragment || '').replace(hashStrip, '');
      if (this.fragment == frag || this.fragment == decodeURIComponent(frag)) return;
      if (this._hasPushState) {
        var loc = window.location;
        if (frag.indexOf(this.options.root) != 0) frag = this.options.root + frag;
        this.fragment = frag;
        window.history.pushState({}, document.title, loc.protocol + '//' + loc.host + frag);
      } else {
        window.location.hash = this.fragment = frag;
        if (this.iframe && (frag != this.getFragment(this.iframe.location.hash))) {
          this.iframe.document.open().close();
          this.iframe.location.hash = frag;
        }
      }
      if (triggerRoute) this.loadUrl(fragment);
    }

  });

  // Backbone.View
  // -------------

  // Creating a Backbone.View creates its initial element outside of the DOM,
  // if an existing element is not provided...
  Backbone.View = function(options) {
    this.cid = _.uniqueId('view');
    this._configure(options || {});
    this._ensureElement();
    this.delegateEvents();
    this.initialize.apply(this, arguments);
  };

  // Element lookup, scoped to DOM elements within the current view.
  // This should be prefered to global lookups, if you're dealing with
  // a specific view.
  var selectorDelegate = function(selector) {
    return $(selector, this.el);
  };

  // Cached regex to split keys for `delegate`.
  var eventSplitter = /^(\S+)\s*(.*)$/;

  // List of view options to be merged as properties.
  var viewOptions = ['model', 'collection', 'el', 'id', 'attributes', 'className', 'tagName'];

  // Set up all inheritable **Backbone.View** properties and methods.
  _.extend(Backbone.View.prototype, Backbone.Events, {

    // The default `tagName` of a View's element is `"div"`.
    tagName : 'div',

    // Attach the `selectorDelegate` function as the `$` property.
    $       : selectorDelegate,

    // Initialize is an empty function by default. Override it with your own
    // initialization logic.
    initialize : function(){},

    // **render** is the core function that your view should override, in order
    // to populate its element (`this.el`), with the appropriate HTML. The
    // convention is for **render** to always return `this`.
    render : function() {
      return this;
    },

    // Remove this view from the DOM. Note that the view isn't present in the
    // DOM by default, so calling this method may be a no-op.
    remove : function() {
      $(this.el).remove();
      return this;
    },

    // For small amounts of DOM Elements, where a full-blown template isn't
    // needed, use **make** to manufacture elements, one at a time.
    //
    //     var el = this.make('li', {'class': 'row'}, this.model.escape('title'));
    //
    make : function(tagName, attributes, content) {
      var el = document.createElement(tagName);
      if (attributes) $(el).attr(attributes);
      if (content) $(el).html(content);
      return el;
    },

    // Set callbacks, where `this.callbacks` is a hash of
    //
    // *{"event selector": "callback"}*
    //
    //     {
    //       'mousedown .title':  'edit',
    //       'click .button':     'save'
    //     }
    //
    // pairs. Callbacks will be bound to the view, with `this` set properly.
    // Uses event delegation for efficiency.
    // Omitting the selector binds the event to `this.el`.
    // This only works for delegate-able events: not `focus`, `blur`, and
    // not `change`, `submit`, and `reset` in Internet Explorer.
    delegateEvents : function(events) {
      if (!(events || (events = this.events))) return;
      if (_.isFunction(events)) events = events.call(this);
      $(this.el).unbind('.delegateEvents' + this.cid);
      for (var key in events) {
        var method = this[events[key]];
        if (!method) throw new Error('Event "' + events[key] + '" does not exist');
        var match = key.match(eventSplitter);
        var eventName = match[1], selector = match[2];
        method = _.bind(method, this);
        eventName += '.delegateEvents' + this.cid;
        if (selector === '') {
          $(this.el).bind(eventName, method);
        } else {
          $(this.el).delegate(selector, eventName, method);
        }
      }
    },

    // Performs the initial configuration of a View with a set of options.
    // Keys with special meaning *(model, collection, id, className)*, are
    // attached directly to the view.
    _configure : function(options) {
      if (this.options) options = _.extend({}, this.options, options);
      for (var i = 0, l = viewOptions.length; i < l; i++) {
        var attr = viewOptions[i];
        if (options[attr]) this[attr] = options[attr];
      }
      this.options = options;
    },

    // Ensure that the View has a DOM element to render into.
    // If `this.el` is a string, pass it through `$()`, take the first
    // matching element, and re-assign it to `el`. Otherwise, create
    // an element from the `id`, `className` and `tagName` proeprties.
    _ensureElement : function() {
      if (!this.el) {
        var attrs = this.attributes || {};
        if (this.id) attrs.id = this.id;
        if (this.className) attrs['class'] = this.className;
        this.el = this.make(this.tagName, attrs);
      } else if (_.isString(this.el)) {
        this.el = $(this.el).get(0);
      }
    }

  });

  // The self-propagating extend function that Backbone classes use.
  var extend = function (protoProps, classProps) {
    var child = inherits(this, protoProps, classProps);
    child.extend = this.extend;
    return child;
  };

  // Set up inheritance for the model, collection, and view.
  Backbone.Model.extend = Backbone.Collection.extend =
    Backbone.Router.extend = Backbone.View.extend = extend;

  // Map from CRUD to HTTP for our default `Backbone.sync` implementation.
  var methodMap = {
    'create': 'POST',
    'update': 'PUT',
    'delete': 'DELETE',
    'read'  : 'GET'
  };

  // Backbone.sync
  // -------------

  // Override this function to change the manner in which Backbone persists
  // models to the server. You will be passed the type of request, and the
  // model in question. By default, uses makes a RESTful Ajax request
  // to the model's `url()`. Some possible customizations could be:
  //
  // * Use `setTimeout` to batch rapid-fire updates into a single request.
  // * Send up the models as XML instead of JSON.
  // * Persist models via WebSockets instead of Ajax.
  //
  // Turn on `Backbone.emulateHTTP` in order to send `PUT` and `DELETE` requests
  // as `POST`, with a `_method` parameter containing the true HTTP method,
  // as well as all requests with the body as `application/x-www-form-urlencoded` instead of
  // `application/json` with the model in a param named `model`.
  // Useful when interfacing with server-side languages like **PHP** that make
  // it difficult to read the body of `PUT` requests.
  Backbone.sync = function(method, model, options) {
    var type = methodMap[method];

    // Default JSON-request options.
    var params = _.extend({
      type:         type,
      dataType:     'json'
    }, options);

    // Ensure that we have a URL.
    if (!params.url) {
      params.url = getUrl(model) || urlError();
    }

    // Ensure that we have the appropriate request data.
    if (!params.data && model && (method == 'create' || method == 'update')) {
      params.contentType = 'application/json';
      params.data = JSON.stringify(model.toJSON());
    }

    // For older servers, emulate JSON by encoding the request into an HTML-form.
    if (Backbone.emulateJSON) {
      params.contentType = 'application/x-www-form-urlencoded';
      params.data        = params.data ? {model : params.data} : {};
    }

    // For older servers, emulate HTTP by mimicking the HTTP method with `_method`
    // And an `X-HTTP-Method-Override` header.
    if (Backbone.emulateHTTP) {
      if (type === 'PUT' || type === 'DELETE') {
        if (Backbone.emulateJSON) params.data._method = type;
        params.type = 'POST';
        params.beforeSend = function(xhr) {
          xhr.setRequestHeader('X-HTTP-Method-Override', type);
        };
      }
    }

    // Don't process data on a non-GET request.
    if (params.type !== 'GET' && !Backbone.emulateJSON) {
      params.processData = false;
    }

    // Make the request.
    return $.ajax(params);
  };

  // Helpers
  // -------

  // Shared empty constructor function to aid in prototype-chain creation.
  var ctor = function(){};

  // 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.
  var inherits = function(parent, protoProps, staticProps) {
    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 `super()`.
    if (protoProps && protoProps.hasOwnProperty('constructor')) {
      child = protoProps.constructor;
    } else {
      child = function(){ return parent.apply(this, arguments); };
    }

    // Inherit class (static) properties from parent.
    _.extend(child, parent);

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

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

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

    // Correctly set child's `prototype.constructor`.
    child.prototype.constructor = child;

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

    return child;
  };

  // Helper function to get a URL from a Model or Collection as a property
  // or as a function.
  var getUrl = function(object) {
    if (!(object && object.url)) return null;
    return _.isFunction(object.url) ? object.url() : object.url;
  };

  // Throw an error when a URL is needed, and none is supplied.
  var urlError = function() {
    throw new Error('A "url" property or function must be specified');
  };

  // Wrap an optional error callback with a fallback error event.
  var wrapError = function(onError, model, options) {
    return function(resp) {
      if (onError) {
        onError(model, resp, options);
      } else {
        model.trigger('error', model, resp, options);
      }
    };
  };

  // Helper function to escape a string for HTML rendering.
  var escapeHTML = function(string) {
    return string.replace(/&(?!\w+;|#\d+;|#x[\da-f]+;)/gi, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#x27;').replace(/\//g,'&#x2F;');
  };

}).call(this);
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