Editorial: Refactor the last bit of prose in NonISOCalendarDateToISO to AOs (#74)

Author: sffc

spec.emu

@@ -678,6 +678,26 @@ contributors: Google, Ecma International
       </emu-alg>
     </emu-clause>
 
+    <emu-clause id="sec-temporal-calendardaysinmonth" type="implementation-defined abstract operation">
+      <h1>
+        CalendarDaysInMonth (
+          _calendar_: a calendar type that is not *"iso8601"*,
+          _arithmeticYear_: an integer,
+          _ordinalMonth_: a positive integer,
+        ): an integer
+      </h1>
+      <dl class="header">
+        <dt>description</dt>
+        <dd>
+          It returns the number of days in the _calendar_-specific _arithmeticYear_ and _ordinalMonth_.
+        </dd>
+      </dl>
+      <p>It performs the following steps when called:</p>
+      <emu-alg>
+        1. Return the number of days in the month of _calendar_ corresponding to _arithmeticYear_ and _ordinalMonth_.
+      </emu-alg>
+    </emu-clause>
+
     <emu-clause id="sec-temporal-isvaliderayearforcalendar" type="abstract operation">
       <h1>
         IsValidEraYearForCalendar (
@@ -860,6 +880,29 @@ contributors: Google, Ecma International
       </emu-alg>
     </emu-clause>
 
+    <emu-clause id="sec-temporal-calendarintegerstoiso" type="implementation-defined abstract operation">
+      <h1>
+        CalendarIntegersToISO (
+          _calendar_: a calendar type that is not *"iso8601"*,
+          _arithmeticYear_: an integer,
+          _ordinalMonth_: a positive integer,
+          _day_: a positive integer,
+        ): either a normal completion containing an ISO Date Record or a throw completion
+      </h1>
+      <dl class="header">
+        <dt>description</dt>
+        <dd>
+          It returns an ISO Date Record that corresponds with the given _calendar_-specific _arithmeticYear_, _ordinalMonth_, and _day_.
+        </dd>
+      </dl>
+      <p>It performs the following steps when called:</p>
+      <emu-alg>
+        1. If _arithmeticYear_, _ordinalMonth_, and _day_ do not form a valid date in _calendar_, throw a RangeError exception.
+        1. Let _isoDate_ be an ISO Date Record such that CalendarISOToDate(_calendar_, _isoDate_) returns a Calendar Date Record whose [[Year]], [[Month]], and [[Day]] field values respectively equal _arithmeticYear_, _ordinalMonth_, and _day_.
+        1. Return _isoDate_.
+      </emu-alg>
+    </emu-clause>
+
     <emu-clause id="sup-temporal-calendar-date-records">
       <h1>Calendar Date Records</h1>
       <p>
@@ -1103,8 +1146,14 @@ contributors: Google, Ecma International
           1. Let _ordinalMonth_ be _fields_.[[Month]].
         1. Let _day_ be _fields_.[[Day]].
         1. Assert: _day_ is not ~unset~.
-        1. If the date described by _calendar_, _arithmeticYear_, _ordinalMonth_, and _day_ does not exist, set _day_ to the closest day in the same month. If there are two equally-close dates in the same month, pick the later one.
-        1. Return an implementation-defined ISO Date Record that corresponds to the date described by _calendar_, _arithmeticYear_, _ordinalMonth_, and _day_.
+        1. Let _daysInMonth_ be CalendarDaysInMonth(_calendar_, _arithmeticYear_, _ordinalMonth_).
+        1. If _daysInMonth_ &lt; _day_, then
+          1. If _overflow_ is ~reject~, throw a *RangeError* exception.
+          1. Let _regulatedDay_ be _daysInMonth_.
+        1. Else,
+          1. Assert: _day_ ≥ 1.
+          1. Let _regulatedDay_ be _day_.
+        1. Return ? CalendarIntegersToISO(_calendar_, _arithmeticYear_, _ordinalMonth_, _regulatedDay_).
       </emu-alg>
     </emu-clause>