feat(dateFilter): add support for STANDALONEMONTH in format (LLLL)

Fixes #13999

Closes #14013

Author: gkalpak

src/ng/filter/filters.js

@@ -358,10 +358,11 @@ function dateGetter(name, size, offset, trim) {
   };
 }
 
-function dateStrGetter(name, shortForm) {
+function dateStrGetter(name, shortForm, standAlone) {
   return function(date, formats) {
     var value = date['get' + name]();
-    var get = uppercase(shortForm ? ('SHORT' + name) : name);
+    var propPrefix = (standAlone ? 'STANDALONE' : '') + (shortForm ? 'SHORT' : '');
+    var get = uppercase(propPrefix + name);
 
     return formats[get][value];
   };
@@ -423,6 +424,7 @@ var DATE_FORMATS = {
    MMM: dateStrGetter('Month', true),
     MM: dateGetter('Month', 2, 1),
      M: dateGetter('Month', 1, 1),
+  LLLL: dateStrGetter('Month', false, true),
     dd: dateGetter('Date', 2),
      d: dateGetter('Date', 1),
     HH: dateGetter('Hours', 2),
@@ -448,7 +450,7 @@ var DATE_FORMATS = {
      GGGG: longEraGetter
 };
 
-var DATE_FORMATS_SPLIT = /((?:[^yMdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|d+|H+|h+|m+|s+|a|Z|G+|w+))(.*)/,
+var DATE_FORMATS_SPLIT = /((?:[^yMLdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|L+|d+|H+|h+|m+|s+|a|Z|G+|w+))(.*)/,
     NUMBER_STRING = /^\-?\d+$/;
 
 /**
@@ -468,6 +470,7 @@ var DATE_FORMATS_SPLIT = /((?:[^yMdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|
  *   * `'MMM'`: Month in year (Jan-Dec)
  *   * `'MM'`: Month in year, padded (01-12)
  *   * `'M'`: Month in year (1-12)
+ *   * `'LLLL'`: Stand-alone month in year (January-December)
  *   * `'dd'`: Day in month, padded (01-31)
  *   * `'d'`: Day in month (1-31)
  *   * `'EEEE'`: Day in Week,(Sunday-Saturday)

test/ng/filter/filtersSpec.js

@@ -349,6 +349,21 @@ describe('filters', function() {
                       toEqual('September 03, 2010 Anno Domini');
     });
 
+    it('should support STANDALONEMONTH in format (`LLLL`)', inject(function($locale) {
+      var standAloneMonth = $locale.DATETIME_FORMATS.STANDALONEMONTH;
+      var september = standAloneMonth[8];
+      var standAloneSeptember = 'StandAlone' + september;
+
+      // Overwrite September in STANDALONEMONTH
+      standAloneMonth[8] = standAloneSeptember;
+
+      expect(date(noon, 'MMMM')).toEqual(september);
+      expect(date(noon, 'LLLL')).toEqual(standAloneSeptember);
+
+      // Restore September in STANDALONEMONTH
+      standAloneMonth[8] = september;
+    }));
+
     it('should accept negative numbers as strings', function() {
       //Note: this tests a timestamp set for 3 days before the unix epoch.
       //The behavior of `date` depends on your timezone, which is why we check just