calendar display type supports Gregorian with Chinese

src/core/calendar.ts

@@ -2,7 +2,16 @@ import type { TypeAndName } from '@/core/base.ts';
 
 export enum CalendarType {
     Gregorian = 0,
-    Buddhist = 1
+    Buddhist = 1,
+    Chinese = 2
+}
+
+export interface ChineseCalendarLocaleData {
+    readonly numerals: string[];
+    readonly monthNames: string[];
+    readonly dayNames: string[];
+    readonly leapMonthPrefix: string;
+    readonly solarTermNames: string[];
 }
 
 export class CalendarDisplayType implements TypeAndName {
@@ -13,6 +22,7 @@ export class CalendarDisplayType implements TypeAndName {
     public static readonly LanguageDefaultType: number = 0;
     public static readonly Gregorian = new CalendarDisplayType(1, 'Gregorian', 'Gregorian', CalendarType.Gregorian);
     public static readonly Buddhist = new CalendarDisplayType(2, 'Buddhist', 'Buddhist', CalendarType.Buddhist);
+    public static readonly GregorianWithChinese = new CalendarDisplayType(3, 'GregorianWithChinese', 'Gregorian with Chinese', CalendarType.Gregorian, CalendarType.Chinese);
 
     public static readonly Default = CalendarDisplayType.Gregorian;
 

src/core/datetime.ts

@@ -1,5 +1,5 @@
 import type { TypeAndName, TypeAndDisplayName } from '@/core/base.ts';
-import type { CalendarType } from '@/core/calendar.ts';
+import type { CalendarType, ChineseCalendarLocaleData } from '@/core/calendar.ts';
 import type { NumeralSystem } from '@/core/numeral.ts';
 
 export interface DateTime {
@@ -12,7 +12,6 @@ export interface DateTime {
     getGregorianCalendarMonthDisplayName(options: DateTimeFormatOptions): string;
     getGregorianCalendarMonthDisplayShortName(options: DateTimeFormatOptions): string;
     getLocalizedCalendarMonth(options: DateTimeFormatOptions): string;
-    getLocalizedCalendarMonthIndex(options: DateTimeFormatOptions): number;
     getLocalizedCalendarMonthDisplayName(options: DateTimeFormatOptions): string;
     getLocalizedCalendarMonthDisplayShortName(options: DateTimeFormatOptions): string;
     getGregorianCalendarDay(): number;
@@ -37,6 +36,7 @@ export interface DateTimeFormatOptions {
     numeralSystem: NumeralSystem;
     calendarType: CalendarType;
     localeData: DateTimeLocaleData;
+    chineseCalendarLocaleData: ChineseCalendarLocaleData;
 }
 
 export interface DateTimeLocaleData {
@@ -82,6 +82,10 @@ export interface MonthDay {
     readonly day: number;
 }
 
+export interface CalendarAlternateDate extends YearMonthDay {
+    readonly displayDate: string;
+}
+
 export interface TimeRange {
     readonly minTime: number;
     readonly maxTime: number;