feat(dateparser): change template literal from ' to `

- Changes from ' to ` for template literals
- Adds documentation about template literals

BREAKING CHANGE: This changes template literals from the single quote
`'` to the backtick character `` ` `` for more natural usage with certain
strings such as `o'clock`.

Closes #4880
Closes #4936
Closes #4938

Author: wesleycho

src/dateparser/dateparser.js

@@ -179,24 +179,24 @@ angular.module('ui.bootstrap.dateparser', [])
     var map = [], regex = format.split('');
 
     // check for literal values
-    var quoteIndex = format.indexOf('\'');
+    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] = '$';
-              regex[i+1] = '';
+          if (format[i] === '`') {
+            if (i + 1 < format.length && format[i + 1] === '\`') { // escaped backtick
+              format[i + 1] = '$';
+              regex[i + 1] = '';
             } else { // end of literal
               regex[i] = '';
               inLiteral = false;
             }
           }
           format[i] = '$';
         } else {
-          if (format[i] === '\'') { // start of literal
+          if (format[i] === '`') { // start of literal
             format[i] = '$';
             regex[i] = '';
             inLiteral = true;

src/dateparser/docs/README.md

@@ -140,3 +140,5 @@ Certain format codes support i18n. Check this [guide](https://docs.angularjs.org
 \* The ones marked with `Leading 0`, needs a leading 0 for values less than 10. Exception being milliseconds which needs it for values under 100.
 
 \** It also supports `fullDate|longDate|medium|mediumDate|mediumTime|short|shortDate|shortTime` as the format for parsing.
+
+\*** It supports template literals as a string between the backtick `\`` character, i.e. `\`The Date is\` MM/DD/YYYY`. If one wants the literal backtick character, one must use `\`\`\`\``.

src/dateparser/test/dateparser.spec.js

@@ -310,23 +310,20 @@ 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));
+      expect(dateParser.parse('29 de January de 2013', 'd `de` MMMM `de` y')).toEqual(new Date(2013, 0, 29));
+      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 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 only a backtick', 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));
+      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));
+      expect(dateParser.parse('year:2013', '`year:`y')).toEqual(new Date(2013, 0, 1));
     });
   });