refactor: include literals at the end of the format

Author: danielkaradachki

src/dates/split-date-format.js

@@ -80,5 +80,9 @@ export default function splitDateFormat(format, locale = 'en') {
         match = dateFormatRegExp.exec(pattern);
     }
 
+    if (lastIndex < pattern.length) {
+        addLiteral(parts, pattern.substring(lastIndex));
+    }
+
     return parts;
 }

test/dates.js

@@ -1192,6 +1192,25 @@ describe('splitDateFormat', () => {
         }]);
     });
 
+    it('result contains literals parts at the start and end of the format', () => {
+
+        expect(splitDateFormat('Foo "M" y')).toEqual([{
+            type: 'literal',
+            pattern: 'Foo "M" '
+        }, {
+            type: 'year',
+            pattern: 'y'
+        }]);
+
+        expect(splitDateFormat('M "M" Foo ')).toEqual([{
+            type: 'month',
+            pattern: 'M'
+        }, {
+            type: 'literal',
+            pattern: ' "M" Foo '
+        }]);
+    });
+
     it('parts contain names information if the pattern uses localized names', () => {
         const expected = [{
             type: "month",