Update undescore.js to version 1.6 and underscore.string.js to version 2.3

bzr revid: mat@openerp.com-20140304125528-97w5kbv3ry028kn9

1 files changed, 674 insertions, 329 deletions

diff --git a/addons/web/static/lib/underscore/underscore.js b/addons/web/static/lib/underscore/underscore.js
index 208d4cd890c..ca61fdc3a4b 100644
--- a/addons/web/static/lib/underscore/underscore.js
+++ b/addons/web/static/lib/underscore/underscore.js
@@ -1,17 +1,14 @@
-//     Underscore.js 1.3.1
-//     (c) 2009-2012 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
+//     Underscore.js 1.6.0
+//     http://underscorejs.org
+//     (c) 2009-2014 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+//     Underscore may be freely distributed under the MIT license.
 
 (function() {
 
   // Baseline setup
   // --------------
 
-  // Establish the root object, `window` in the browser, or `global` on the server.
+  // Establish the root object, `window` in the browser, or `exports` on the server.
   var root = this;
 
   // Save the previous value of the `_` variable.
@@ -24,10 +21,12 @@
   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;
+  var
+    push             = ArrayProto.push,
+    slice            = ArrayProto.slice,
+    concat           = ArrayProto.concat,
+    toString         = ObjProto.toString,
+    hasOwnProperty   = ObjProto.hasOwnProperty;
 
   // All **ECMAScript 5** native function implementations that we hope to use
   // are declared here.
@@ -46,7 +45,11 @@
     nativeBind         = FuncProto.bind;
 
   // Create a safe reference to the Underscore object for use below.
-  var _ = function(obj) { return new wrapper(obj); };
+  var _ = function(obj) {
+    if (obj instanceof _) return obj;
+    if (!(this instanceof _)) return new _(obj);
+    this._wrapped = obj;
+  };
 
   // Export the Underscore object for **Node.js**, with
   // backwards-compatibility for the old `require()` API. If we're in
@@ -58,11 +61,11 @@
     }
     exports._ = _;
   } else {
-    root['_'] = _;
+    root._ = _;
   }
 
   // Current version.
-  _.VERSION = '1.3.1';
+  _.VERSION = '1.6.0';
 
   // Collection Functions
   // --------------------
@@ -71,20 +74,20 @@
   // 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 (obj == null) return obj;
     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;
+      for (var i = 0, length = obj.length; i < length; i++) {
+        if (iterator.call(context, obj[i], i, obj) === breaker) return;
       }
     } else {
-      for (var key in obj) {
-        if (_.has(obj, key)) {
-          if (iterator.call(context, obj[key], key, obj) === breaker) return;
-        }
+      var keys = _.keys(obj);
+      for (var i = 0, length = keys.length; i < length; i++) {
+        if (iterator.call(context, obj[keys[i]], keys[i], obj) === breaker) return;
       }
     }
+    return obj;
   };
 
   // Return the results of applying the iterator to each element.
@@ -94,12 +97,13 @@
     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);
+      results.push(iterator.call(context, value, index, list));
     });
-    if (obj.length === +obj.length) results.length = obj.length;
     return results;
   };
 
+  var reduceError = 'Reduce of empty array with no initial value';
+
   // **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) {
@@ -117,7 +121,7 @@
         memo = iterator.call(context, memo, value, index, list);
       }
     });
-    if (!initial) throw new TypeError('Reduce of empty array with no initial value');
+    if (!initial) throw new TypeError(reduceError);
     return memo;
   };
 
@@ -130,16 +134,29 @@
       if (context) iterator = _.bind(iterator, context);
       return initial ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
     }
-    var reversed = _.toArray(obj).reverse();
-    if (context && !initial) iterator = _.bind(iterator, context);
-    return initial ? _.reduce(reversed, iterator, memo, context) : _.reduce(reversed, iterator);
+    var length = obj.length;
+    if (length !== +length) {
+      var keys = _.keys(obj);
+      length = keys.length;
+    }
+    each(obj, function(value, index, list) {
+      index = keys ? keys[--length] : --length;
+      if (!initial) {
+        memo = obj[index];
+        initial = true;
+      } else {
+        memo = iterator.call(context, memo, obj[index], index, list);
+      }
+    });
+    if (!initial) throw new TypeError(reduceError);
+    return memo;
   };
 
   // Return the first value which passes a truth test. Aliased as `detect`.
-  _.find = _.detect = function(obj, iterator, context) {
+  _.find = _.detect = function(obj, predicate, context) {
     var result;
     any(obj, function(value, index, list) {
-      if (iterator.call(context, value, index, list)) {
+      if (predicate.call(context, value, index, list)) {
         result = value;
         return true;
       }
@@ -150,179 +167,246 @@
   // 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) {
+  _.filter = _.select = function(obj, predicate, context) {
     var results = [];
     if (obj == null) return results;
-    if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
+    if (nativeFilter && obj.filter === nativeFilter) return obj.filter(predicate, context);
     each(obj, function(value, index, list) {
-      if (iterator.call(context, value, index, list)) results[results.length] = value;
+      if (predicate.call(context, value, index, list)) results.push(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;
+  _.reject = function(obj, predicate, context) {
+    return _.filter(obj, function(value, index, list) {
+      return !predicate.call(context, value, index, list);
+    }, context);
   };
 
   // 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) {
+  _.every = _.all = function(obj, predicate, context) {
+    predicate || (predicate = _.identity);
     var result = true;
     if (obj == null) return result;
-    if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
+    if (nativeEvery && obj.every === nativeEvery) return obj.every(predicate, context);
     each(obj, function(value, index, list) {
-      if (!(result = result && iterator.call(context, value, index, list))) return breaker;
+      if (!(result = result && predicate.call(context, value, index, list))) return breaker;
     });
-    return result;
+    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 any = _.some = _.any = function(obj, predicate, context) {
+    predicate || (predicate = _.identity);
     var result = false;
     if (obj == null) return result;
-    if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
+    if (nativeSome && obj.some === nativeSome) return obj.some(predicate, context);
     each(obj, function(value, index, list) {
-      if (result || (result = iterator.call(context, value, index, list))) return breaker;
+      if (result || (result = predicate.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;
+  // Determine if the array or object contains a given value (using `===`).
+  // Aliased as `include`.
+  _.contains = _.include = function(obj, target) {
+    if (obj == null) return false;
     if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
-    found = any(obj, function(value) {
+    return any(obj, function(value) {
       return value === target;
     });
-    return found;
   };
 
   // Invoke a method (with arguments) on every item in a collection.
   _.invoke = function(obj, method) {
     var args = slice.call(arguments, 2);
+    var isFunc = _.isFunction(method);
     return _.map(obj, function(value) {
-      return (_.isFunction(method) ? method || value : value[method]).apply(value, args);
+      return (isFunc ? method : 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 _.map(obj, _.property(key));
+  };
+
+  // Convenience version of a common use case of `filter`: selecting only objects
+  // containing specific `key:value` pairs.
+  _.where = function(obj, attrs) {
+    return _.filter(obj, _.matches(attrs));
+  };
+
+  // Convenience version of a common use case of `find`: getting the first object
+  // containing specific `key:value` pairs.
+  _.findWhere = function(obj, attrs) {
+    return _.find(obj, _.matches(attrs));
   };
 
   // Return the maximum element or (element-based computation).
+  // Can't optimize arrays of integers longer than 65,535 elements.
+  // See [WebKit Bug 80797](https://bugs.webkit.org/show_bug.cgi?id=80797)
   _.max = function(obj, iterator, context) {
-    if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
-    if (!iterator && _.isEmpty(obj)) return -Infinity;
-    var result = {computed : -Infinity};
+    if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
+      return Math.max.apply(Math, obj);
+    }
+    var result = -Infinity, lastComputed = -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});
+      if (computed > lastComputed) {
+        result = value;
+        lastComputed = computed;
+      }
     });
-    return result.value;
+    return result;
   };
 
   // Return the minimum element (or element-based computation).
   _.min = function(obj, iterator, context) {
-    if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj);
-    if (!iterator && _.isEmpty(obj)) return Infinity;
-    var result = {computed : Infinity};
+    if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
+      return Math.min.apply(Math, obj);
+    }
+    var result = Infinity, lastComputed = 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});
+      if (computed < lastComputed) {
+        result = value;
+        lastComputed = computed;
+      }
     });
-    return result.value;
+    return result;
   };
 
-  // Shuffle an array.
+  // Shuffle an array, using the modern version of the
+  // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
   _.shuffle = function(obj) {
-    var shuffled = [], rand;
-    each(obj, function(value, index, list) {
-      if (index == 0) {
-        shuffled[0] = value;
-      } else {
-        rand = Math.floor(Math.random() * (index + 1));
-        shuffled[index] = shuffled[rand];
-        shuffled[rand] = value;
-      }
+    var rand;
+    var index = 0;
+    var shuffled = [];
+    each(obj, function(value) {
+      rand = _.random(index++);
+      shuffled[index - 1] = shuffled[rand];
+      shuffled[rand] = value;
     });
     return shuffled;
   };
 
+  // Sample **n** random values from a collection.
+  // If **n** is not specified, returns a single random element.
+  // The internal `guard` argument allows it to work with `map`.
+  _.sample = function(obj, n, guard) {
+    if (n == null || guard) {
+      if (obj.length !== +obj.length) obj = _.values(obj);
+      return obj[_.random(obj.length - 1)];
+    }
+    return _.shuffle(obj).slice(0, Math.max(0, n));
+  };
+
+  // An internal function to generate lookup iterators.
+  var lookupIterator = function(value) {
+    if (value == null) return _.identity;
+    if (_.isFunction(value)) return value;
+    return _.property(value);
+  };
+
   // Sort the object's values by a criterion produced by an iterator.
   _.sortBy = function(obj, iterator, context) {
+    iterator = lookupIterator(iterator);
     return _.pluck(_.map(obj, function(value, index, list) {
       return {
-        value : value,
-        criteria : iterator.call(context, value, index, list)
+        value: value,
+        index: index,
+        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;
+      var a = left.criteria;
+      var b = right.criteria;
+      if (a !== b) {
+        if (a > b || a === void 0) return 1;
+        if (a < b || b === void 0) return -1;
+      }
+      return left.index - right.index;
     }), 'value');
   };
 
+  // An internal function used for aggregate "group by" operations.
+  var group = function(behavior) {
+    return function(obj, iterator, context) {
+      var result = {};
+      iterator = lookupIterator(iterator);
+      each(obj, function(value, index) {
+        var key = iterator.call(context, value, index, obj);
+        behavior(result, key, value);
+      });
+      return result;
+    };
+  };
+
   // Groups the object's values by a criterion. Pass either a string attribute
   // to group by, or a function that returns the criterion.
-  _.groupBy = function(obj, val) {
-    var result = {};
-    var iterator = _.isFunction(val) ? val : function(obj) { return obj[val]; };
-    each(obj, function(value, index) {
-      var key = iterator(value, index);
-      (result[key] || (result[key] = [])).push(value);
-    });
-    return result;
-  };
+  _.groupBy = group(function(result, key, value) {
+    _.has(result, key) ? result[key].push(value) : result[key] = [value];
+  });
+
+  // Indexes the object's values by a criterion, similar to `groupBy`, but for
+  // when you know that your index values will be unique.
+  _.indexBy = group(function(result, key, value) {
+    result[key] = value;
+  });
+
+  // Counts instances of an object that group by a certain criterion. Pass
+  // either a string attribute to count by, or a function that returns the
+  // criterion.
+  _.countBy = group(function(result, key) {
+    _.has(result, key) ? result[key]++ : result[key] = 1;
+  });
 
-  // 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);
+  // Use a comparator function to figure out the smallest index at which
+  // an object should be inserted so as to maintain order. Uses binary search.
+  _.sortedIndex = function(array, obj, iterator, context) {
+    iterator = lookupIterator(iterator);
+    var value = iterator.call(context, obj);
     var low = 0, high = array.length;
     while (low < high) {
-      var mid = (low + high) >> 1;
-      iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid;
+      var mid = (low + high) >>> 1;
+      iterator.call(context, array[mid]) < value ? 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);
+  // Safely create a real, live array from anything iterable.
+  _.toArray = function(obj) {
+    if (!obj) return [];
+    if (_.isArray(obj)) return slice.call(obj);
+    if (obj.length === +obj.length) return _.map(obj, _.identity);
+    return _.values(obj);
   };
 
   // Return the number of elements in an object.
   _.size = function(obj) {
-    return _.toArray(obj).length;
+    if (obj == null) return 0;
+    return (obj.length === +obj.length) ? obj.length : _.keys(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];
+  // values in the array. Aliased as `head` and `take`. The **guard** check
+  // allows it to work with `_.map`.
+  _.first = _.head = _.take = function(array, n, guard) {
+    if (array == null) return void 0;
+    if ((n == null) || guard) return array[0];
+    if (n < 0) return [];
+    return slice.call(array, 0, n);
   };
 
-  // Returns everything but the last entry of the array. Especcialy useful on
+  // Returns everything but the last entry of the array. Especially useful on
   // the arguments object. Passing **n** will return all the values in
   // the array, excluding the last N. The **guard** check allows it to work with
   // `_.map`.
@@ -333,33 +417,42 @@
   // Get the last element of an array. Passing **n** will return the last N
   // values in the array. The **guard** check allows it to work with `_.map`.
   _.last = function(array, n, guard) {
-    if ((n != null) && !guard) {
-      return slice.call(array, Math.max(array.length - n, 0));
-    } else {
-      return array[array.length - 1];
-    }
+    if (array == null) return void 0;
+    if ((n == null) || guard) return array[array.length - 1];
+    return slice.call(array, Math.max(array.length - n, 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**
+  // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.
+  // Especially useful on the arguments object. Passing an **n** will return
+  // the rest N values in the array. The **guard**
   // check allows it to work with `_.map`.
-  _.rest = _.tail = function(array, index, guard) {
-    return slice.call(array, (index == null) || guard ? 1 : index);
+  _.rest = _.tail = _.drop = function(array, n, guard) {
+    return slice.call(array, (n == null) || guard ? 1 : n);
   };
 
   // Trim out all falsy values from an array.
   _.compact = function(array) {
-    return _.filter(array, function(value){ return !!value; });
+    return _.filter(array, _.identity);
+  };
+
+  // Internal implementation of a recursive `flatten` function.
+  var flatten = function(input, shallow, output) {
+    if (shallow && _.every(input, _.isArray)) {
+      return concat.apply(output, input);
+    }
+    each(input, function(value) {
+      if (_.isArray(value) || _.isArguments(value)) {
+        shallow ? push.apply(output, value) : flatten(value, shallow, output);
+      } else {
+        output.push(value);
+      }
+    });
+    return output;
   };
 
-  // Return a completely flattened version of an array.
+  // Flatten out an array, either recursively (by default), or just one level.
   _.flatten = function(array, shallow) {
-    return _.reduce(array, function(memo, value) {
-      if (_.isArray(value)) return memo.concat(shallow ? value : _.flatten(value));
-      memo[memo.length] = value;
-      return memo;
-    }, []);
+    return flatten(array, shallow, []);
   };
 
   // Return a version of the array that does not contain the specified value(s).
@@ -367,20 +460,36 @@
     return _.difference(array, slice.call(arguments, 1));
   };
 
+  // Split an array into two arrays: one whose elements all satisfy the given
+  // predicate, and one whose elements all do not satisfy the predicate.
+  _.partition = function(array, predicate, context) {
+    predicate = lookupIterator(predicate);
+    var pass = [], fail = [];
+    each(array, function(elem) {
+      (predicate.call(context, elem) ? pass : fail).push(elem);
+    });
+    return [pass, fail];
+  };
+
   // 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];
+  _.uniq = _.unique = function(array, isSorted, iterator, context) {
+    if (_.isFunction(isSorted)) {
+      context = iterator;
+      iterator = isSorted;
+      isSorted = false;
+    }
+    var initial = iterator ? _.map(array, iterator, context) : array;
+    var results = [];
+    var seen = [];
+    each(initial, function(value, index) {
+      if (isSorted ? (!index || seen[seen.length - 1] !== value) : !_.contains(seen, value)) {
+        seen.push(value);
+        results.push(array[index]);
       }
-      return memo;
-    }, []);
-    return result;
+    });
+    return results;
   };
 
   // Produce an array that contains the union: each distinct element from all of
@@ -390,12 +499,12 @@
   };
 
   // Produce an array that contains every item shared between all the
-  // passed-in arrays. (Aliased as "intersect" for back-compat.)
-  _.intersection = _.intersect = function(array) {
+  // passed-in arrays.
+  _.intersection = function(array) {
     var rest = slice.call(arguments, 1);
     return _.filter(_.uniq(array), function(item) {
       return _.every(rest, function(other) {
-        return _.indexOf(other, item) >= 0;
+        return _.contains(other, item);
       });
     });
   };
@@ -403,20 +512,37 @@
   // Take the difference between one array and a number of other arrays.
   // Only the elements present in just the first array will remain.
   _.difference = function(array) {
-    var rest = _.flatten(slice.call(arguments, 1));
-    return _.filter(array, function(value){ return !_.include(rest, value); });
+    var rest = concat.apply(ArrayProto, slice.call(arguments, 1));
+    return _.filter(array, function(value){ return !_.contains(rest, 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 length = _.max(_.pluck(arguments, 'length').concat(0));
     var results = new Array(length);
-    for (var i = 0; i < length; i++) results[i] = _.pluck(args, "" + i);
+    for (var i = 0; i < length; i++) {
+      results[i] = _.pluck(arguments, '' + i);
+    }
     return results;
   };
 
+  // Converts lists into objects. Pass either a single array of `[key, value]`
+  // pairs, or two parallel arrays of the same length -- one of keys, and one of
+  // the corresponding values.
+  _.object = function(list, values) {
+    if (list == null) return {};
+    var result = {};
+    for (var i = 0, length = list.length; i < length; i++) {
+      if (values) {
+        result[list[i]] = values[i];
+      } else {
+        result[list[i][0]] = list[i][1];
+      }
+    }
+    return result;
+  };
+
   // 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.
@@ -425,22 +551,29 @@
   // for **isSorted** to use binary search.
   _.indexOf = function(array, item, isSorted) {
     if (array == null) return -1;
-    var i, l;
+    var i = 0, length = array.length;
     if (isSorted) {
-      i = _.sortedIndex(array, item);
-      return array[i] === item ? i : -1;
+      if (typeof isSorted == 'number') {
+        i = (isSorted < 0 ? Math.max(0, length + isSorted) : isSorted);
+      } else {
+        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 (i in array && array[i] === item) return i;
+    if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item, isSorted);
+    for (; i < length; i++) if (array[i] === item) return i;
     return -1;
   };
 
   // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
-  _.lastIndexOf = function(array, item) {
+  _.lastIndexOf = function(array, item, from) {
     if (array == null) return -1;
-    if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item);
-    var i = array.length;
-    while (i--) if (i in array && array[i] === item) return i;
+    var hasIndex = from != null;
+    if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) {
+      return hasIndex ? array.lastIndexOf(item, from) : array.lastIndexOf(item);
+    }
+    var i = (hasIndex ? from : array.length);
+    while (i--) if (array[i] === item) return i;
     return -1;
   };
 
@@ -454,11 +587,11 @@
     }
     step = arguments[2] || 1;
 
-    var len = Math.max(Math.ceil((stop - start) / step), 0);
+    var length = Math.max(Math.ceil((stop - start) / step), 0);
     var idx = 0;
-    var range = new Array(len);
+    var range = new Array(length);
 
-    while(idx < len) {
+    while(idx < length) {
       range[idx++] = start;
       start += step;
     }
@@ -473,29 +606,46 @@
   var ctor = function(){};
 
   // 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 bind(func, context) {
-    var bound, args;
-    if (func.bind === nativeBind && nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
+  // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if
+  // available.
+  _.bind = function(func, context) {
+    var args, bound;
+    if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
     if (!_.isFunction(func)) throw new TypeError;
     args = slice.call(arguments, 2);
     return bound = function() {
       if (!(this instanceof bound)) return func.apply(context, args.concat(slice.call(arguments)));
       ctor.prototype = func.prototype;
       var self = new ctor;
+      ctor.prototype = null;
       var result = func.apply(self, args.concat(slice.call(arguments)));
       if (Object(result) === result) return result;
       return self;
     };
   };
 
-  // Bind all of an object's methods to that object. Useful for ensuring that
-  // all callbacks defined on an object belong to it.
+  // Partially apply a function by creating a version that has had some of its
+  // arguments pre-filled, without changing its dynamic `this` context. _ acts
+  // as a placeholder, allowing any combination of arguments to be pre-filled.
+  _.partial = function(func) {
+    var boundArgs = slice.call(arguments, 1);
+    return function() {
+      var position = 0;
+      var args = boundArgs.slice();
+      for (var i = 0, length = args.length; i < length; i++) {
+        if (args[i] === _) args[i] = arguments[position++];
+      }
+      while (position < arguments.length) args.push(arguments[position++]);
+      return func.apply(this, args);
+    };
+  };
+
+  // Bind a number of an object's methods to that object. Remaining arguments
+  // are the method names to be bound. 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);
+    if (funcs.length === 0) throw new Error('bindAll must be passed function names');
     each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
     return obj;
   };
@@ -514,7 +664,7 @@
   // it with the arguments supplied.
   _.delay = function(func, wait) {
     var args = slice.call(arguments, 2);
-    return setTimeout(function(){ return func.apply(func, args); }, wait);
+    return setTimeout(function(){ return func.apply(null, args); }, wait);
   };
 
   // Defers a function, scheduling it to run after the current call stack has
@@ -524,41 +674,74 @@
   };
 
   // Returns a function, that, when invoked, will only be triggered at most once
-  // during a given window of time.
-  _.throttle = function(func, wait) {
-    var context, args, timeout, throttling, more;
-    var whenDone = _.debounce(function(){ more = throttling = false; }, wait);
+  // during a given window of time. Normally, the throttled function will run
+  // as much as it can, without ever going more than once per `wait` duration;
+  // but if you'd like to disable the execution on the leading edge, pass
+  // `{leading: false}`. To disable execution on the trailing edge, ditto.
+  _.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 : _.now();
+      timeout = null;
+      result = func.apply(context, args);
+      context = args = null;
+    };
     return function() {
-      context = this; args = arguments;
-      var later = function() {
+      var now = _.now();
+      if (!previous && options.leading === false) previous = now;
+      var remaining = wait - (now - previous);
+      context = this;
+      args = arguments;
+      if (remaining <= 0) {
+        clearTimeout(timeout);
         timeout = null;
-        if (more) func.apply(context, args);
-        whenDone();
-      };
-      if (!timeout) timeout = setTimeout(later, wait);
-      if (throttling) {
-        more = true;
-      } else {
-        func.apply(context, args);
+        previous = now;
+        result = func.apply(context, args);
+        context = args = null;
+      } else if (!timeout && options.trailing !== false) {
+        timeout = setTimeout(later, remaining);
       }
-      whenDone();
-      throttling = true;
+      return result;
     };
   };
 
   // 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) {
-    var timeout;
-    return function() {
-      var context = this, args = arguments;
-      var later = function() {
+  // N milliseconds. If `immediate` is passed, trigger the function on the
+  // leading edge, instead of the trailing.
+  _.debounce = function(func, wait, immediate) {
+    var timeout, args, context, timestamp, result;
+
+    var later = function() {
+      var last = _.now() - timestamp;
+      if (last < wait) {
+        timeout = setTimeout(later, wait - last);
+      } else {
         timeout = null;
-        func.apply(context, args);
-      };
-      clearTimeout(timeout);
-      timeout = setTimeout(later, wait);
+        if (!immediate) {
+          result = func.apply(context, args);
+          context = args = null;
+        }
+      }
+    };
+
+    return function() {
+      context = this;
+      args = arguments;
+      timestamp = _.now();
+      var callNow = immediate && !timeout;
+      if (!timeout) {
+        timeout = setTimeout(later, wait);
+      }
+      if (callNow) {
+        result = func.apply(context, args);
+        context = args = null;
+      }
+
+      return result;
     };
   };
 
@@ -569,7 +752,9 @@
     return function() {
       if (ran) return memo;
       ran = true;
-      return memo = func.apply(this, arguments);
+      memo = func.apply(this, arguments);
+      func = null;
+      return memo;
     };
   };
 
@@ -577,10 +762,7 @@
   // 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, 0));
-      return wrapper.apply(this, args);
-    };
+    return _.partial(wrapper, func);
   };
 
   // Returns a function that is the composition of a list of functions, each
@@ -598,9 +780,10 @@
 
   // Returns a function that will only be executed after being called N times.
   _.after = function(times, func) {
-    if (times <= 0) return func();
     return function() {
-      if (--times < 1) { return func.apply(this, arguments); }
+      if (--times < 1) {
+        return func.apply(this, arguments);
+      }
     };
   };
 
@@ -609,16 +792,44 @@
 
   // 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');
+  _.keys = function(obj) {
+    if (!_.isObject(obj)) return [];
+    if (nativeKeys) return nativeKeys(obj);
     var keys = [];
-    for (var key in obj) if (_.has(obj, key)) keys[keys.length] = key;
+    for (var key in obj) if (_.has(obj, key)) keys.push(key);
     return keys;
   };
 
   // Retrieve the values of an object's properties.
   _.values = function(obj) {
-    return _.map(obj, _.identity);
+    var keys = _.keys(obj);
+    var length = keys.length;
+    var values = new Array(length);
+    for (var i = 0; i < length; i++) {
+      values[i] = obj[keys[i]];
+    }
+    return values;
+  };
+
+  // Convert an object into a list of `[key, value]` pairs.
+  _.pairs = function(obj) {
+    var keys = _.keys(obj);
+    var length = keys.length;
+    var pairs = new Array(length);
+    for (var i = 0; i < length; i++) {
+      pairs[i] = [keys[i], obj[keys[i]]];
+    }
+    return pairs;
+  };
+
+  // Invert the keys and values of an object. The values must be serializable.
+  _.invert = function(obj) {
+    var result = {};
+    var keys = _.keys(obj);
+    for (var i = 0, length = keys.length; i < length; i++) {
+      result[obj[keys[i]]] = keys[i];
+    }
+    return result;
   };
 
   // Return a sorted list of the function names available on the object.
@@ -634,18 +845,42 @@
   // 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) {
-        obj[prop] = source[prop];
+      if (source) {
+        for (var prop in source) {
+          obj[prop] = source[prop];
+        }
       }
     });
     return obj;
   };
 
+  // Return a copy of the object only containing the whitelisted properties.
+  _.pick = function(obj) {
+    var copy = {};
+    var keys = concat.apply(ArrayProto, slice.call(arguments, 1));
+    each(keys, function(key) {
+      if (key in obj) copy[key] = obj[key];
+    });
+    return copy;
+  };
+
+   // Return a copy of the object without the blacklisted properties.
+  _.omit = function(obj) {
+    var copy = {};
+    var keys = concat.apply(ArrayProto, slice.call(arguments, 1));
+    for (var key in obj) {
+      if (!_.contains(keys, key)) copy[key] = obj[key];
+    }
+    return copy;
+  };
+
   // 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];
+      if (source) {
+        for (var prop in source) {
+          if (obj[prop] === void 0) obj[prop] = source[prop];
+        }
       }
     });
     return obj;
@@ -665,19 +900,16 @@
     return obj;
   };
 
-  // Internal recursive comparison function.
-  function eq(a, b, stack) {
+  // Internal recursive comparison function for `isEqual`.
+  var eq = function(a, b, aStack, bStack) {
     // Identical objects are equal. `0 === -0`, but they aren't identical.
-    // See the Harmony `egal` proposal: http://wiki.ecmascript.org/doku.php?id=harmony:egal.
+    // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
     if (a === b) return a !== 0 || 1 / a == 1 / b;
     // A strict comparison is necessary because `null == undefined`.
     if (a == null || b == null) return a === b;
     // Unwrap any wrapped objects.
-    if (a._chain) a = a._wrapped;
-    if (b._chain) b = b._wrapped;
-    // Invoke a custom `isEqual` method if one is provided.
-    if (a.isEqual && _.isFunction(a.isEqual)) return a.isEqual(b);
-    if (b.isEqual && _.isFunction(b.isEqual)) return b.isEqual(a);
+    if (a instanceof _) a = a._wrapped;
+    if (b instanceof _) b = b._wrapped;
     // Compare `[[Class]]` names.
     var className = toString.call(a);
     if (className != toString.call(b)) return false;
@@ -707,14 +939,23 @@
     if (typeof a != 'object' || typeof b != 'object') return false;
     // Assume equality for cyclic structures. The algorithm for detecting cyclic
     // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
-    var length = stack.length;
+    var length = aStack.length;
     while (length--) {
       // Linear search. Performance is inversely proportional to the number of
       // unique nested structures.
-      if (stack[length] == a) return true;
+      if (aStack[length] == a) return bStack[length] == b;
+    }
+    // Objects with different constructors are not equivalent, but `Object`s
+    // from different frames are.
+    var aCtor = a.constructor, bCtor = b.constructor;
+    if (aCtor !== bCtor && !(_.isFunction(aCtor) && (aCtor instanceof aCtor) &&
+                             _.isFunction(bCtor) && (bCtor instanceof bCtor))
+                        && ('constructor' in a && 'constructor' in b)) {
+      return false;
     }
     // Add the first object to the stack of traversed objects.
-    stack.push(a);
+    aStack.push(a);
+    bStack.push(b);
     var size = 0, result = true;
     // Recursively compare objects and arrays.
     if (className == '[object Array]') {
@@ -724,20 +965,17 @@
       if (result) {
         // Deep compare the contents, ignoring non-numeric properties.
         while (size--) {
-          // Ensure commutative equality for sparse arrays.
-          if (!(result = size in a == size in b && eq(a[size], b[size], stack))) break;
+          if (!(result = eq(a[size], b[size], aStack, bStack))) break;
         }
       }
     } else {
-      // Objects with different constructors are not equivalent.
-      if ('constructor' in a != 'constructor' in b || a.constructor != b.constructor) return false;
       // Deep compare objects.
       for (var key in a) {
         if (_.has(a, key)) {
           // Count the expected number of properties.
           size++;
           // Deep compare each member.
-          if (!(result = _.has(b, key) && eq(a[key], b[key], stack))) break;
+          if (!(result = _.has(b, key) && eq(a[key], b[key], aStack, bStack))) break;
         }
       }
       // Ensure that both objects contain the same number of properties.
@@ -749,18 +987,20 @@
       }
     }
     // Remove the first object from the stack of traversed objects.
-    stack.pop();
+    aStack.pop();
+    bStack.pop();
     return result;
-  }
+  };
 
   // Perform a deep comparison to check if two objects are equal.
   _.isEqual = function(a, b) {
-    return eq(a, b, []);
+    return eq(a, b, [], []);
   };
 
   // Is a given array, string, or object empty?
   // An "empty" object has no enumerable own-properties.
   _.isEmpty = function(obj) {
+    if (obj == null) return true;
     if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
     for (var key in obj) if (_.has(obj, key)) return false;
     return true;
@@ -768,7 +1008,7 @@
 
   // Is a given value a DOM element?
   _.isElement = function(obj) {
-    return !!(obj && obj.nodeType == 1);
+    return !!(obj && obj.nodeType === 1);
   };
 
   // Is a given value an array?
@@ -782,35 +1022,36 @@
     return obj === Object(obj);
   };
 
-  // Is a given variable an arguments object?
-  _.isArguments = function(obj) {
-    return toString.call(obj) == '[object Arguments]';
-  };
+  // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp.
+  each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp'], function(name) {
+    _['is' + name] = function(obj) {
+      return toString.call(obj) == '[object ' + name + ']';
+    };
+  });
+
+  // Define a fallback version of the method in browsers (ahem, IE), where
+  // there isn't any inspectable "Arguments" type.
   if (!_.isArguments(arguments)) {
     _.isArguments = function(obj) {
       return !!(obj && _.has(obj, 'callee'));
     };
   }
 
-  // Is a given value a function?
-  _.isFunction = function(obj) {
-    return toString.call(obj) == '[object Function]';
-  };
-
-  // Is a given value a string?
-  _.isString = function(obj) {
-    return toString.call(obj) == '[object String]';
-  };
+  // Optimize `isFunction` if appropriate.
+  if (typeof (/./) !== 'function') {
+    _.isFunction = function(obj) {
+      return typeof obj === 'function';
+    };
+  }
 
-  // Is a given value a number?
-  _.isNumber = function(obj) {
-    return toString.call(obj) == '[object Number]';
+  // Is a given object a finite number?
+  _.isFinite = function(obj) {
+    return isFinite(obj) && !isNaN(parseFloat(obj));
   };
 
-  // Is the given value `NaN`?
+  // Is the given value `NaN`? (NaN is the only number which does not equal itself).
   _.isNaN = function(obj) {
-    // `NaN` is the only value for which `===` is not reflexive.
-    return obj !== obj;
+    return _.isNumber(obj) && obj != +obj;
   };
 
   // Is a given value a boolean?
@@ -818,16 +1059,6 @@
     return obj === true || obj === false || toString.call(obj) == '[object Boolean]';
   };
 
-  // Is a given value a date?
-  _.isDate = function(obj) {
-    return toString.call(obj) == '[object Date]';
-  };
-
-  // Is the given value a regular expression?
-  _.isRegExp = function(obj) {
-    return toString.call(obj) == '[object RegExp]';
-  };
-
   // Is a given value equal to null?
   _.isNull = function(obj) {
     return obj === null;
@@ -838,7 +1069,8 @@
     return obj === void 0;
   };
 
-  // Has own property?
+  // Shortcut function for checking if an object has a given property directly
+  // on itself (in other words, not on a prototype).
   _.has = function(obj, key) {
     return hasOwnProperty.call(obj, key);
   };
@@ -858,21 +1090,94 @@
     return value;
   };
 
+  _.constant = function(value) {
+    return function () {
+      return value;
+    };
+  };
+
+  _.property = function(key) {
+    return function(obj) {
+      return obj[key];
+    };
+  };
+
+  // Returns a predicate for checking whether an object has a given set of `key:value` pairs.
+  _.matches = function(attrs) {
+    return function(obj) {
+      if (obj === attrs) return true; //avoid comparing an object to itself.
+      for (var key in attrs) {
+        if (attrs[key] !== obj[key])
+          return false;
+      }
+      return true;
+    }
+  };
+
   // Run a function **n** times.
-  _.times = function (n, iterator, context) {
-    for (var i = 0; i < n; i++) iterator.call(context, i);
+  _.times = function(n, iterator, context) {
+    var accum = Array(Math.max(0, n));
+    for (var i = 0; i < n; i++) accum[i] = iterator.call(context, i);
+    return accum;
+  };
+
+  // Return a random integer between min and max (inclusive).
+  _.random = function(min, max) {
+    if (max == null) {
+      max = min;
+      min = 0;
+    }
+    return min + Math.floor(Math.random() * (max - min + 1));
+  };
+
+  // A (possibly faster) way to get the current timestamp as an integer.
+  _.now = Date.now || function() { return new Date().getTime(); };
+
+  // List of HTML entities for escaping.
+  var entityMap = {
+    escape: {
+      '&': '&amp;',
+      '<': '&lt;',
+      '>': '&gt;',
+      '"': '&quot;',
+      "'": '&#x27;'
+    }
+  };
+  entityMap.unescape = _.invert(entityMap.escape);
+
+  // Regexes containing the keys and values listed immediately above.
+  var entityRegexes = {
+    escape:   new RegExp('[' + _.keys(entityMap.escape).join('') + ']', 'g'),
+    unescape: new RegExp('(' + _.keys(entityMap.unescape).join('|') + ')', 'g')
   };
 
-  // Escape a string for HTML interpolation.
-  _.escape = function(string) {
-    return (''+string).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#x27;').replace(/\//g,'&#x2F;');
+  // Functions for escaping and unescaping strings to/from HTML interpolation.
+  _.each(['escape', 'unescape'], function(method) {
+    _[method] = function(string) {
+      if (string == null) return '';
+      return ('' + string).replace(entityRegexes[method], function(match) {
+        return entityMap[method][match];
+      });
+    };
+  });
+
+  // If the value of the named `property` is a function then invoke it with the
+  // `object` as context; otherwise, return it.
+  _.result = function(object, property) {
+    if (object == null) return void 0;
+    var value = object[property];
+    return _.isFunction(value) ? value.call(object) : value;
   };
 
-  // Add your own custom functions to the Underscore object, ensuring that
-  // they're correctly added to the OOP wrapper as well.
+  // Add your own custom functions to the Underscore object.
   _.mixin = function(obj) {
-    each(_.functions(obj), function(name){
-      addToWrapper(name, _[name] = obj[name]);
+    each(_.functions(obj), function(name) {
+      var func = _[name] = obj[name];
+      _.prototype[name] = function() {
+        var args = [this._wrapped];
+        push.apply(args, arguments);
+        return result.call(this, func.apply(_, args));
+      };
     });
   };
 
@@ -880,7 +1185,7 @@
   // Useful for temporary DOM ids.
   var idCounter = 0;
   _.uniqueId = function(prefix) {
-    var id = idCounter++;
+    var id = ++idCounter + '';
     return prefix ? prefix + id : id;
   };
 
@@ -895,41 +1200,80 @@
   // When customizing `templateSettings`, if you don't want to define an
   // interpolation, evaluation or escaping regex, we need one that is
   // guaranteed not to match.
-  var noMatch = /.^/;
+  var noMatch = /(.)^/;
 
-  // Within an interpolation, evaluation, or escaping, remove HTML escaping
-  // that had been previously added.
-  var unescape = function(code) {
-    return code.replace(/\\\\/g, '\\').replace(/\\'/g, "'");
+  // Certain characters need to be escaped so that they can be put into a
+  // string literal.
+  var escapes = {
+    "'":      "'",
+    '\\':     '\\',
+    '\r':     'r',
+    '\n':     'n',
+    '\t':     't',
+    '\u2028': 'u2028',
+    '\u2029': 'u2029'
   };
 
+  var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/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.escape || noMatch, function(match, code) {
-           return "',_.escape(" + unescape(code) + "),'";
-         })
-         .replace(c.interpolate || noMatch, function(match, code) {
-           return "'," + unescape(code) + ",'";
-         })
-         .replace(c.evaluate || noMatch, function(match, code) {
-           return "');" + unescape(code).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);
-    if (data) return func(data, _);
-    return function(data) {
-      return func.call(this, data, _);
+  _.template = function(text, data, settings) {
+    var render;
+    settings = _.defaults({}, settings, _.templateSettings);
+
+    // Combine delimiters into one regular expression via alternation.
+    var matcher = new RegExp([
+      (settings.escape || noMatch).source,
+      (settings.interpolate || noMatch).source,
+      (settings.evaluate || noMatch).source
+    ].join('|') + '|$', 'g');
+
+    // Compile the template source, escaping string literals appropriately.
+    var index = 0;
+    var source = "__p+='";
+    text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
+      source += text.slice(index, offset)
+        .replace(escaper, function(match) { return '\\' + escapes[match]; });
+
+      if (escape) {
+        source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
+      }
+      if (interpolate) {
+        source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
+      }
+      if (evaluate) {
+        source += "';\n" + evaluate + "\n__p+='";
+      }
+      index = offset + match.length;
+      return match;
+    });
+    source += "';\n";
+
+    // If a variable is not specified, place data values in local scope.
+    if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';
+
+    source = "var __t,__p='',__j=Array.prototype.join," +
+      "print=function(){__p+=__j.call(arguments,'');};\n" +
+      source + "return __p;\n";
+
+    try {
+      render = new Function(settings.variable || 'obj', '_', source);
+    } catch (e) {
+      e.source = source;
+      throw e;
+    }
+
+    if (data) return render(data, _);
+    var template = function(data) {
+      return render.call(this, data, _);
     };
+
+    // Provide the compiled function source as a convenience for precompilation.
+    template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';
+
+    return template;
   };
 
   // Add a "chain" function, which will delegate to the wrapper.
@@ -937,29 +1281,15 @@
     return _(obj).chain();
   };
 
-  // The OOP Wrapper
+  // OOP
   // ---------------
-
   // 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);
-    };
+  var result = function(obj) {
+    return this._chain ? _(obj).chain() : obj;
   };
 
   // Add all of the Underscore functions to the wrapper object.
@@ -968,32 +1298,47 @@
   // 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() {
-      var wrapped = this._wrapped;
-      method.apply(wrapped, arguments);
-      var length = wrapped.length;
-      if ((name == 'shift' || name == 'splice') && length === 0) delete wrapped[0];
-      return result(wrapped, this._chain);
+    _.prototype[name] = function() {
+      var obj = this._wrapped;
+      method.apply(obj, arguments);
+      if ((name == 'shift' || name == 'splice') && obj.length === 0) delete obj[0];
+      return result.call(this, obj);
     };
   });
 
   // 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);
+    _.prototype[name] = function() {
+      return result.call(this, method.apply(this._wrapped, arguments));
     };
   });
 
-  // Start chaining a wrapped Underscore object.
-  wrapper.prototype.chain = function() {
-    this._chain = true;
-    return this;
-  };
+  _.extend(_.prototype, {
 
-  // Extracts the result from a wrapped and chained object.
-  wrapper.prototype.value = function() {
-    return this._wrapped;
-  };
+    // Start chaining a wrapped Underscore object.
+    chain: function() {
+      this._chain = true;
+      return this;
+    },
 
+    // Extracts the result from a wrapped and chained object.
+    value: function() {
+      return this._wrapped;
+    }
+
+  });
+
+  // AMD registration happens at the end for compatibility with AMD loaders
+  // that may not enforce next-turn semantics on modules. Even though general
+  // practice for AMD registration is to be anonymous, underscore registers
+  // as a named module because, like jQuery, it is a base library that is
+  // popular enough to be bundled in a third party lib, but not be part of
+  // an AMD load request. Those cases could generate an error when an
+  // anonymous define() is called outside of a loader request.
+  if (typeof define === 'function' && define.amd) {
+    define('underscore', [], function() {
+      return _;
+    });
+  }
 }).call(this);