feat(dateparser): add support for literals

- Add support for string literals via single quotes

Closes #3914
Closes #4426

Author: tobigun

src/dateparser/dateparser.js

@@ -111,6 +111,35 @@ angular.module('ui.bootstrap.dateparser', [])
   function createParser(format) {
     var map = [], regex = format.split('');
 
+    // check for literal values
+    var quoteIndex = format.indexOf('\'');
+    if (quoteIndex > -1) {
+      var inLiteral = false;
+      format = format.split('');
+      for (var i = quoteIndex; i < format.length; i++) {
+        if (inLiteral) {
+          if (format[i] === '\'') {
+            if (i + 1 < format.length && format[i+1] === '\'') { // escaped single quote
+              format[i+1] = '$';
+              regex[i+1] = '';
+            } else { // end of literal
+              regex[i] = '';
+              inLiteral = false;
+            }
+          }
+          format[i] = '$';
+        } else {
+          if (format[i] === '\'') { // start of literal
+            format[i] = '$';
+            regex[i] = '';
+            inLiteral = true;
+          }
+        }
+      }
+
+      format = format.join('');
+    }
+
     angular.forEach(formatCodeToRegex, function(data, code) {
       var index = format.indexOf(code);
 

src/dateparser/test/dateparser.spec.js

@@ -204,6 +204,28 @@ describe('date parser', function() {
     });
   });
 
+  describe('with value literals', function() {
+    it('should work with multiple literals', function() {
+      expect(dateParser.parse('29 de January de 2013', 'd \'de\' MMMM \'de\' y')).toEqual(new Date(2013, 0, 29));
+    });
+
+    it('should work with escaped single quote', function() {
+      expect(dateParser.parse('22.March.15 12 o\'clock', 'd.MMMM.yy h \'o\'\'clock\'')).toEqual(new Date(2015, 2, 22, 12));
+    });
+
+    it('should work with only a single quote', function() {
+      expect(dateParser.parse('22.March.15 \'', 'd.MMMM.yy \'\'\'')).toEqual(new Date(2015, 2, 22));
+    });
+
+    it('should work with trailing literal', function() {
+      expect(dateParser.parse('year 2013', '\'year\' y')).toEqual(new Date(2013, 0, 1));
+    });
+
+    it('should work without whitespace', function() {
+      expect(dateParser.parse('year:2013', '\'year:\'y')).toEqual(new Date(2013, 0, 1));
+    });
+  });
+
   describe('with edge case', function() {
     it('should not work for invalid number of days in February', function() {
       expectParse('29.02.2013', 'dd.MM.yyyy', undefined);

src/datepicker/docs/readme.md

@@ -28,7 +28,7 @@ All settings can be provided as attributes in the `uib-datepicker` or globally c
  * `date-disabled (date, mode)`
  	_(Default: null)_ :
  	An optional expression to disable visible options based on passing date and current mode _(day|month|year)_.
- 	
+
  * `custom-class (date, mode)`
  	_(Default: null)_ :
  	An optional expression to add classes based on passing date and current mode _(day|month|year)_. 	
@@ -79,7 +79,7 @@ All settings can be provided as attributes in the `uib-datepicker` or globally c
 
  * `year-range`
  	_(Default: 20)_ :
- 	Number of years displayed in year selection. 
+ 	Number of years displayed in year selection.
 
  * `shortcut-propagation`
   _(Default: false)_ :
@@ -97,7 +97,7 @@ Specific settings for the `uib-datepicker-popup`, that can globally configured t
 
  * `uib-datepicker-popup`
  	_(Default: 'yyyy-MM-dd')_ :
- 	The format for displayed dates.
+ 	The format for displayed dates. This string can take string literals by surrounding the value with single quotes, i.e. `yyyy-MM-dd h 'o\'clock'`
 
  * `show-button-bar`
  	_(Default: true)_ :
@@ -154,4 +154,4 @@ Depending on datepicker's current mode, the date may refer either to day, month
  * `Enter`/`Space`: Select date.
  * `Ctrl`+`Up`: Move to an upper mode.
  * `Ctrl`+`Down`: Move to a lower mode.
- * `Esc`: Will close popup, and move focus to the input.
+ * `Esc`: Will close popup, and move focus to the input.