fix(dateparser): add type and validity check

- Add type and validity check to ensure proper date object is created
- Make code style uniform in scripts
- Add warning if the string is not a valid date

Closes #3701
Closes #3759
Closes #3933
Fixes #3609
Fixes #3713
Fixes #3736
Fixes #3875
Fixes #3937
Fixes #3976

Author: wesleycho

Diff for: src/dateparser/dateparser.js

@@ -1,6 +1,6 @@
 angular.module('ui.bootstrap.dateparser', [])
 
-.service('dateParser', ['$locale', 'orderByFilter', function($locale, orderByFilter) {
+.service('dateParser', ['$log', '$locale', 'orderByFilter', function($log, $locale, orderByFilter) {
   // Pulled from https://github.com/mbostock/d3/blob/master/src/format/requote.js
   var SPECIAL_CHARACTERS_REGEXP = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
 
@@ -125,7 +125,7 @@ angular.module('ui.bootstrap.dateparser', [])
 
     if ( results && results.length ) {
       var fields, dt;
-      if (baseDate) {
+      if (angular.isDate(baseDate) && !isNaN(baseDate.getTime())) {
         fields = {
           year: baseDate.getFullYear(),
           month: baseDate.getMonth(),
@@ -136,6 +136,9 @@ angular.module('ui.bootstrap.dateparser', [])
           milliseconds: baseDate.getMilliseconds()
         };
       } else {
+        if (baseDate) {
+          $log.warn('dateparser:', 'baseDate is not a valid date');
+        }
         fields = { year: 1900, month: 0, date: 1, hours: 0, minutes: 0, seconds: 0, milliseconds: 0 };
       }
 

Diff for: src/dateparser/test/dateparser.spec.js

@@ -162,6 +162,14 @@ describe('date parser', function () {
       expect(dateParser.parse('31-04-2013', 'dd-MM-yyyy')).toBeUndefined();
       expect(dateParser.parse('November 31, 2013', 'MMMM d, yyyy')).toBeUndefined();
     });
+
+    it('should work when base date is a string', function() {
+      expect(dateParser.parse('01-02-2034', 'dd-MM-yyyy', '05-06-2078')).toEqual(new Date(2034, 1, 1));
+    });
+
+    it('should work when base date is an invalid date', function() {
+      expect(dateParser.parse('30-12-2015', 'dd-MM-yyyy', new Date('foo'))).toEqual(new Date(2015, 11, 30));
+    });
   });
 
   it('should not parse non-string inputs', function() {