Add p+ tokens support to parse function

src/parse/index.js

@@ -5,6 +5,7 @@ import toDate from '../toDate/index.js'
 import subMilliseconds from '../subMilliseconds/index.js'
 import defaultLocale from '../locale/en-US/index.js'
 import parsers from './_lib/parsers/index.js'
+import longFormatters from '../_lib/format/longFormatters/index.js'
 import {
   isProtectedWeekYearToken,
   isProtectedDayOfYearToken,
@@ -26,6 +27,10 @@ var TIMEZONE_UNIT_PRIORITY = 10
 // - . matches any single character unmatched by previous parts of the RegExps
 var formattingTokensRegExp = /[yYQqMLwIdDecihHKkms]o|(\w)\1*|''|'(''|[^'])+('|$)|./g
 
+// This RegExp catches symbols escaped by quotes, and also
+// sequences of symbols P, p, and the combinations like `PPPPPPPppppp`
+var longFormattingTokensRegExp = /P+p+|P+|p+|''|'(''|[^'])+('|$)|./g
+
 var escapedStringRegExp = /^'(.*?)'?$/
 var doubleQuoteRegExp = /''/g
 
@@ -186,6 +191,16 @@ var unescapedLatinCharacterRegExp = /[a-zA-Z]/
  * |                                 |     | xxx     | -08:00, +05:30, +00:00            | 2     |
  * |                                 |     | xxxx    | -0800, +0530, +0000, +123456      |       |
  * |                                 |     | xxxxx   | -08:00, +05:30, +00:00, +12:34:56 |       |
+ * | Long localized date             |   ? | P       | 05/29/1453                        | 7     |
+ * |                                 |     | PP      | May 29, 1453                      | 7     |
+ * |                                 |     | PPP     | May 29th, 1453                    | 7     |
+ * |                                 |     | PPPP    | Sunday, May 29th, 1453            | 2,5   |
+ * | Long localized time             |   ? | p       | 12:00 AM                          | 7     |
+ * |                                 |     | pp      | 12:00:00 AM                       | 7     |
+ * | Combination of date and time    |   ? | Pp      | 05/29/1453, 12:00 AM              | 7     |
+ * |                                 |     | PPpp    | May 29, 1453, 12:00:00 AM         | 7     |
+ * |                                 |     | PPPpp   | May 29th, 1453 at ...             | 7     |
+ * |                                 |     | PPPPpp  | Sunday, May 29th, 1453 at ...     | 2,5   |
  * Notes:
  * 1. "Formatting" units (e.g. formatting quarter) in the default en-US locale
  *    are the same as "stand-alone" units, but are different in some languages.
@@ -240,6 +255,8 @@ var unescapedLatinCharacterRegExp = /[a-zA-Z]/
  *    - `I`: ISO week of year
  *    - `R`: ISO week-numbering year
  *    - `o`: ordinal number modifier
+ *    - `P`: long localized date
+ *    - `p`: long localized time
  *
  * 6. `YY` and `YYYY` tokens represent week-numbering years but they are often confused with years.
  *    You should enable `options.useAdditionalWeekYearTokens` to use them. See: https://git.io/fxCyr
@@ -397,7 +414,19 @@ export default function parse(
 
   var i
 
-  var tokens = formatString.match(formattingTokensRegExp)
+  var tokens = formatString
+    .match(longFormattingTokensRegExp)
+    .map(function(substring) {
+      var firstCharacter = substring[0]
+      if (firstCharacter === 'p' || firstCharacter === 'P') {
+        var longFormatter = longFormatters[firstCharacter]
+        const a = longFormatter(substring, locale.formatLong, subFnOptions)
+        return a
+      }
+      return substring
+    })
+    .join('')
+    .match(formattingTokensRegExp)
 
   for (i = 0; i < tokens.length; i++) {
     var token = tokens[i]