ampproject · samouri · Jul 1, 2020 · Jun 15, 2020 · Jun 25, 2020 · Jun 26, 2020
diff --git a/build-system/compile/sources.js b/build-system/compile/sources.js
@@ -42,6 +42,7 @@ const COMMON_GLOBS = [
   'node_modules/intersection-observer/intersection-observer.install.js',
   'node_modules/promise-pjs/package.json',
   'node_modules/promise-pjs/promise.mjs',
+  'node_modules/rrule/dist/es5/rrule.min.js',
   'node_modules/web-animations-js/package.json',
   'node_modules/web-animations-js/web-animations.install.js',
   'node_modules/web-activities/package.json',

diff --git a/build-system/externs/amp.extern.js b/build-system/externs/amp.extern.js
@@ -323,6 +323,21 @@ window.vg;
  */
 let ReactRender = function () {};
 
+/** @constructor */
+let RRule;
+/**
+ * @param {Date} unusedDt
+ * @param {boolean=} unusedInc
+ * @return {?Date}
+ */
+RRule.prototype.before = function (unusedDt, unusedInc) {};
+/**
+ * @param {Date} unusedDt
+ * @param {boolean=} unusedInc
+ * @return {?Date}
+ */
+RRule.prototype.after = function (unusedDt, unusedInc) {};
+
 /**
  * @dict
  */

diff --git a/build-system/tasks/update-packages.js b/build-system/tasks/update-packages.js
@@ -95,6 +95,29 @@ function patchIntersectionObserver() {
   writeIfUpdated(patchedName, file);
 }
 
+/**
+ * TODO(samouri): remove this patch when a better fix is upstreamed (https://github.com/jakubroztocil/rrule/pull/410).
+ *
+ * Patches rrule to remove references to luxon. Even though rrule marks luxon as an optional dependency,
+ * it is used as if it's a required one (static import). rrule relies on its consumers either
+ * installing luxon or adding it as a webpack-style external. We don't want the former and
+ * can't yet do the latter.
+ *
+ * This function replaces the reference to luxon with a mock that throws (which the code handles well).
+ */
+function patchRRule() {
+  const path = 'node_modules/rrule/dist/es5/rrule.min.js';
+  const patchedContents = fs
+    .readFileSync(path)
+    .toString()
+    .replace(
+      /require\("luxon"\)/g,
+      `{ DateTime: { fromJSDate() { throw TypeError() } } }`
+    );
+
+  writeIfUpdated(path, patchedContents);
+}
+
 /**
  * Does a yarn check on node_modules, and if it is outdated, runs yarn.
  */
@@ -145,6 +168,7 @@ async function updatePackages() {
   }
   patchWebAnimations();
   patchIntersectionObserver();
+  patchRRule();
 }
 
 module.exports = {

diff --git a/examples/date-picker.amp.html b/examples/date-picker.amp.html
@@ -51,6 +51,19 @@
 </head>
 <body>
   <h1>amp-date-picker</h1>
+  <h2>highlighted and blocked attributes</h2>
+  <amp-date-picker id="simple-date-picker-3"
+    type="single"
+    mode="static"
+    layout="fixed-height"
+    height="360"
+    on="select:AMP.setState({date3: event.date ? event.date : ''})"
+    locale="en"
+    format="YYYY-MM-DD"
+    highlighted="FREQ=WEEKLY;WKST=SU;BYDAY=TH"
+    blocked="FREQ=WEEKLY;WKST=SU;BYDAY=SA,SU">
+  </amp-date-picker>
+
   <h2><code>&lt;amp-date-range&gt;</code></h2>
   <p>Try to pick a range. This is a date-range picker</p>
   <amp-date-picker

diff --git a/extensions/amp-date-picker/0.1/dates-list.js b/extensions/amp-date-picker/0.1/dates-list.js
@@ -14,16 +14,20 @@
  * limitations under the License.
  */
 
+import * as rrule from '../../../node_modules/rrule/dist/es5/rrule.min.js';
 import {requireExternal} from '../../../src/module';
 
+const rrulestr = rrule.default.rrulestr || rrule.rrulestr; // CC imports into .default, browserify flattens a layer.
+
 /** @enum {string} */
 const DateType = {
   INVALID: 'invalid',
+  RRULE: 'rrule',
   DATE: 'date',
 };
 
 /**
- * A class which wraps a list of moment dates.
+ * A class which wraps a list of moment dates or RRULE dates.
  */
 export class DatesList {
   /**
@@ -38,6 +42,11 @@ export class DatesList {
     /** @private @const */
     this.moment_ = requireExternal('moment');
 
+    /** @private @const */
+    this.rrulestrs_ = dates
+      .filter((d) => this.getDateType_(d) === DateType.RRULE)
+      .map((d) => tryParseRrulestr(d));
+
     /** @private @const */
     this.dates_ = dates
       .filter((d) => this.getDateType_(d) == DateType.DATE)
@@ -46,14 +55,14 @@ export class DatesList {
   }
 
   /**
-   * Determines if the given date is contained within the moment dates
+   * Determines if the given date is contained within the RRULEs or moment dates
    * contained in the date list.
    * @param {!moment|string} date
    * @return {boolean}
    */
   contains(date) {
     const m = this.moment_(date);
-    return this.matchesDate_(m);
+    return this.matchesDate_(m) || this.matchesRrule_(m);
   }
 
   /**
@@ -73,7 +82,17 @@ export class DatesList {
       }
     }
 
-    return firstDatesAfter.sort((a, b) => a.toDate() - b.toDate())[0];
+    const rruleDates = this.rrulestrs_
+      .map((rrule) => /** @type {RRule} */ (rrule).after(date))
+      .filter(Boolean)
+      .map(normalizeRruleReturn);
+
+    return firstDatesAfter.concat(rruleDates).sort((a, b) => {
+      // toDate method does not exist for RRule dates.
+      a = a.toDate ? a.toDate() : a;
+      b = b.toDate ? b.toDate() : b;
+      return a - b;
+    })[0];
   }
 
   /**
@@ -87,7 +106,26 @@ export class DatesList {
   }
 
   /**
-   * Distinguish between moment dates.
+   * Determines if any internal RRULE object matches the given date.
+   * @param {!moment} date
+   * @return {boolean}
+   * @private
+   */
+  matchesRrule_(date) {
+    const nextDate = date.clone().startOf('day').add(1, 'day').toDate();
+    return this.rrulestrs_.some((rrule) => {
+      const rruleUTCDate = /** @type {RRule} */ (rrule).before(nextDate);
+      if (!rruleUTCDate) {
+        return false;
+      }
+      const rruleLocalDate = normalizeRruleReturn(rruleUTCDate);
+      const rruleMoment = this.moment_(rruleLocalDate);
+      return this.ReactDates_['isSameDay'](rruleMoment, date);
+    });
+  }
+
+  /**
+   * Distinguish between RRULE dates and moment dates.
    * @param {!moment|string} date
    * @return {!DateType}
    * @private
@@ -97,6 +135,42 @@ export class DatesList {
       return DateType.DATE;
     }
 
+    const dateStr = /** @type {string} */ (date);
+    if (tryParseRrulestr(dateStr)) {
+      return DateType.RRULE;
+    }
+
     return DateType.INVALID;
   }
 }
+
+/**
+ * RRULE returns dates as local time formatted at UTC, so the
+ * Date.prototype.getUTC* methods must be used to create a new date object.
+ * {@link https://github.com/jakubroztocil/rrule#important-use-utc-dates}
+ * @param {!Date} rruleDate
+ * @return {!Date}
+ */
+function normalizeRruleReturn(rruleDate) {
+  const year = rruleDate.getUTCFullYear();
+  const month = rruleDate.getUTCMonth();
+  const day = rruleDate.getUTCDate();
+  const hours = rruleDate.getUTCHours();
+  const minutes = rruleDate.getUTCMinutes();
+  const seconds = rruleDate.getUTCSeconds();
+  const ms = rruleDate.getUTCMilliseconds();
+  return new Date(year, month, day, hours, minutes, seconds, ms);
+}
+
+/**
+ * Tries to parse a string into an RRULE object.
+ * @param {string} str A string which represents a repeating date RRULE spec.
+ * @return {?RRule}
+ */
+function tryParseRrulestr(str) {
+  try {
+    return rrulestr(str, {});
+  } catch (e) {
+    return null;
+  }
+}
diff --git a/extensions/amp-date-picker/0.1/test/test-amp-date-picker.js b/extensions/amp-date-picker/0.1/test/test-amp-date-picker.js
@@ -37,7 +37,8 @@ describes.realWin(
     "templates": [{
       "id": "srcTemplate",
       "dates": [
-        "2018-01-01"
+        "2018-01-01",
+        "FREQ=WEEKLY;DTSTART=20180101T080000Z;WKST=SU;BYDAY=WE"
       ]
     }, {
       "id": "defaultTemplate"
@@ -232,7 +233,7 @@ describes.realWin(
 
     describe('templates', () => {
       describe('element templates', () => {
-        it('should parse date templates', () => {
+        it('should parse RRule and date templates', () => {
           const template = createDateTemplate('{{template}}', {
             dates: '2018-01-01',
           });
@@ -245,7 +246,7 @@ describes.realWin(
       });
 
       describe('src templates', () => {
-        it('should parse date templates', function () {
+        it('should parse RRULE and date templates', function () {
           this.timeout(4000);
           const template = createDateTemplate('{{val}}', {
             dates: '2018-01-01',
@@ -263,6 +264,7 @@ describes.realWin(
           );
           expect(srcTemplates[0].dates.contains('2018-01-01')).to.be.true;
           expect(srcTemplates[0].dates.contains('2018-01-02')).to.be.false;
+          expect(srcTemplates[0].dates.contains('2018-01-03')).to.be.true;
           expect(srcTemplates[0].template).to.equal(template);
           expect(srcDefaultTemplate).to.equal(defaultTemplate);
         });

diff --git a/extensions/amp-date-picker/0.1/test/test-dates-list.js b/extensions/amp-date-picker/0.1/test/test-dates-list.js
@@ -21,20 +21,26 @@ import {requireExternal} from '../../../../src/module';
 describes.sandboxed('DatesList', {}, () => {
   const moment = requireExternal('moment');
 
-  it('should accept date strings', function () {
+  it('should accept date strings and RRule strings', function () {
     this.timeout(3000);
     const containedDate = '09/04/1998';
     const notContainedDate = '09/03/1998';
-    const datesList = new DatesList([containedDate]);
+    const containedRrule =
+      'FREQ=WEEKLY;COUNT=10;DTSTART=20180101T000000Z;WKST=SU;BYDAY=TU,SA';
+    const matchesRrule = '01/02/2018';
+    const datesList = new DatesList([containedDate, containedRrule]);
 
     expect(datesList.contains(containedDate)).to.be.true;
     expect(datesList.contains(notContainedDate)).to.be.false;
+    expect(datesList.contains(matchesRrule)).to.be.true;
   });
 
   it('should accept moment objects', () => {
     const containedDate = '09/04/1998';
     const containedMoment = moment(containedDate);
-    const datesList = new DatesList([containedMoment]);
+    const containedRrule =
+      'FREQ=WEEKLY;COUNT=10;DTSTART=20180101T000000Z;WKST=SU;BYDAY=TU,SA';
+    const datesList = new DatesList([containedMoment, containedRrule]);
 
     expect(datesList.contains(containedDate)).to.be.true;
     expect(datesList.contains(containedMoment)).to.be.true;
@@ -62,8 +68,10 @@ describes.sandboxed('DatesList', {}, () => {
     const containedDate = '09/04/1998';
     const dateBefore = '01/01/1998';
     // const notContainedDate = '09/03/1998';
+    const containedRrule =
+      'FREQ=WEEKLY;COUNT=10;DTSTART=20180101T000000Z;WKST=SU;BYDAY=TU,SA';
     // const matchesRrule = '01/02/2018';
-    const datesList = new DatesList([containedDate]);
+    const datesList = new DatesList([containedDate, containedRrule]);
 
     const result = datesList.firstDateAfter(dateBefore);
 

diff --git a/extensions/amp-date-picker/amp-date-picker.md b/extensions/amp-date-picker/amp-date-picker.md
@@ -183,12 +183,20 @@ and the user can select a date range with a starting date and ending date.
 
 ## Date formats
 
-`amp-date-picker` attributes accept dates in ISO 8601.
+`amp-date-picker` attributes accept dates in ISO 8601 and RFC 5545 RRULE formats.
 
 [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) formats dates as `YYYY-MM-DD`
 and is the standard for sharing dates between electronic systems.
 For example, ISO 8601 formats the date February 28 2018 as `2018-02-28`.
 
+[RFC 5545 Recurrence Rules (RRULEs)](https://icalendar.org/iCalendar-RFC-5545/3-3-10-recurrence-rule.html)
+standardize a format for specifying repeating dates.
+For example, RFC 5545 formats Halloween as `RRULE:FREQ=YEARLY;BYMONTH=10;BYMONTHDAY=31`.
+More complex dates are also possible, such as the United States Thanksgiving holiday,
+which is every November on the fourth Thursday: `RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=+4TH`.
+The API is not friendly to memorize, but there are various
+[RRULE generators](https://jakubroztocil.github.io/rrule) available online.
+
 ## Attributes
 
 ##### mode
@@ -349,11 +357,11 @@ The day to specify as the first day of the week (0-6). The default value is `"0"
 
 ##### blocked
 
-A space-separated list of ISO 8601 dates to prevent the user from selecting on the calendar.
+A space-separated list of ISO 8601 dates or RFC 5545 RRULE repeating dates to prevent the user from selecting on the calendar.
 
 ##### highlighted
 
-A space-separated list of ISO 8601 dates to specially style as highlighted to draw the user's attention.
+A space-separated list of ISO 8601 dates or RFC 5545 RRULE repeating dates to specially style as highlighted to draw the user's attention.
 Default styling is a blue dot on the date.
 
 ##### day-size
@@ -398,7 +406,7 @@ The following table lists the properties that you can specify in the JSON data:
 </tr>
 <tr>
 <td><code>blocked</code></td>
-<td>An array of ISO 8601 single dates to render as blocked in the calendar view. The user is prevented from selecting these dates.</td>
+<td>An array of ISO 8601 single dates or RFC 5545 RRULE repeating dates to render as blocked in the calendar view. The user is prevented from selecting these dates.</td>
 </tr>
 <tr>
 <td><code>date</code></td>
@@ -410,7 +418,7 @@ The following table lists the properties that you can specify in the JSON data:
 </tr>
 <tr>
 <td><code>highlighted</code></td>
-<td>An array of ISO 8601 single dates to render as highlighted in the calendar view.</td>
+<td>An array of ISO 8601 single dates or RFC 5545 RRULE repeating dates to render as highlighted in the calendar view.</td>
 </tr>
 <tr>
 <td><code>startDate</code></td>
@@ -427,7 +435,7 @@ The `src` attribute may be updated after a user gesture with [`amp-bind`](https:
 
 ###### template definition objects
 
-The `dates` property is an array of ISO 8601 single dates.
+The `dates` property is an array of ISO 8601 single dates or RFC 5545 RRULE repeating dates.
 The `id` property specifies the `id` of a template that the date picker can use to
 render the specified dates in the calendar view.
 
@@ -736,7 +744,7 @@ Using `src` prevents chached AMP documents from showing out-of-date information.
 
 A `date-template` must have a `dates` or `default` attribute.
 
-- **dates**: A space-separated list of ISO 8601 single dates.
+- **dates**: A space-separated list of ISO 8601 single dates or RFC 5545 RRULE repeating dates.
   The template content will render for the dates matching the dates in the attribute.
 - **default**: If the `default` attribute is present, the template content will render for
   all dates not matching an existing template.

diff --git a/package.json b/package.json
@@ -25,6 +25,7 @@
     "promise-pjs": "1.1.4",
     "prop-types": "15.7.2",
     "react-dates": "15.5.3",
+    "rrule": "2.6.4",
     "web-activities": "1.13.0",
     "web-animations-js": "2.3.1"
   },

diff --git a/test/fixtures/e2e/amp-date-picker/blocked-dates.html b/test/fixtures/e2e/amp-date-picker/blocked-dates.html
@@ -27,5 +27,12 @@ <h2>blocked dates</h2>
       number-of-months="2"
       src="http://localhost:__TEST_SERVER_PORT__/test/date-picker/config.json">
   </amp-date-picker>
+  <amp-date-picker
+      id="rrule"
+      layout="fixed-height" height="360"
+      number-of-months="2"
+      highlighted="FREQ=WEEKLY;WKST=SU;BYDAY=TH"
+      blocked="FREQ=WEEKLY;WKST=SU;BYDAY=SA,SU">
+  </amp-date-picker>
 </body>
 </html>