From e4264a826a2cfe0ca0c94f08e37c62c050c5e4c3 Mon Sep 17 00:00:00 2001
From: haytenf <haytenf@stanford.edu>
Date: Fri, 16 Aug 2024 12:11:24 -0400
Subject: [PATCH] CLDR-10347 show one example for each day period, excluding
 midnight (#3949)

---
 .../unicode/cldr/test/ExampleGenerator.java   | 29 +++++++++++----
 .../cldr/unittest/TestExampleGenerator.java   | 36 +++++++++++++++++++
 2 files changed, 58 insertions(+), 7 deletions(-)

diff --git a/tools/cldr-code/src/main/java/org/unicode/cldr/test/ExampleGenerator.java b/tools/cldr-code/src/main/java/org/unicode/cldr/test/ExampleGenerator.java
index 913e4884462..e3641e07fa9 100644
--- a/tools/cldr-code/src/main/java/org/unicode/cldr/test/ExampleGenerator.java
+++ b/tools/cldr-code/src/main/java/org/unicode/cldr/test/ExampleGenerator.java
@@ -168,7 +168,6 @@ public class ExampleGenerator {
 
     private static final Date DATE_SAMPLE2;
     private static final Date DATE_SAMPLE3;
-    private static final Date DATE_SAMPLE4;
 
     static {
         Calendar calendar = Calendar.getInstance(ZONE_SAMPLE, ULocale.ENGLISH);
@@ -180,8 +179,6 @@ public class ExampleGenerator {
 
         calendar.set(1999, 8, 5, 7, 0, 0); // 1999-09-05 07:00:00
         DATE_SAMPLE3 = calendar.getTime();
-        calendar.set(1999, 8, 5, 23, 0, 0); // 1999-09-05 23:00:00
-        DATE_SAMPLE4 = calendar.getTime();
     }
 
     static final List<DecimalQuantity> CURRENCY_SAMPLES =
@@ -2597,7 +2594,6 @@ private String handleDateFormatItem(String xpath, String value, boolean showCont
                 String numbersOverride = parts.findAttributeValue("pattern", "numbers");
                 SimpleDateFormat sdf =
                         icuServiceBuilder.getDateFormat(calendar, value, numbersOverride);
-                sdf.setTimeZone(ZONE_SAMPLE);
                 String defaultNumberingSystem =
                         cldrFile.getWinningValue("//ldml/numbers/defaultNumberingSystem");
                 String timeSeparator =
@@ -2609,6 +2605,7 @@ private String handleDateFormatItem(String xpath, String value, boolean showCont
                 dfs.setTimeSeparatorString(timeSeparator);
                 sdf.setDateFormatSymbols(dfs);
                 if (id == null || id.indexOf('B') < 0) {
+                    sdf.setTimeZone(ZONE_SAMPLE);
                     // Standard date/time format, or availableFormat without dayPeriod
                     if (value.contains("MMM") || value.contains("LLL")) {
                         // alpha month, do not need context examples
@@ -2626,9 +2623,27 @@ private String handleDateFormatItem(String xpath, String value, boolean showCont
                     }
                 } else {
                     List<String> examples = new ArrayList<>();
-                    examples.add(sdf.format(DATE_SAMPLE3));
-                    examples.add(sdf.format(DATE_SAMPLE));
-                    examples.add(sdf.format(DATE_SAMPLE4));
+                    DayPeriodInfo dayPeriodInfo =
+                            supplementalDataInfo.getDayPeriods(
+                                    DayPeriodInfo.Type.format, cldrFile.getLocaleID());
+                    Set<DayPeriod> dayPeriods =
+                            new LinkedHashSet<DayPeriod>(dayPeriodInfo.getPeriods());
+                    for (DayPeriod dayPeriod : dayPeriods) {
+                        if (dayPeriod.equals(
+                                DayPeriod.midnight)) { // suppress midnight, see ICU-12278 bug
+                            continue;
+                        }
+                        R3<Integer, Integer, Boolean> info =
+                                dayPeriodInfo.getFirstDayPeriodInfo(dayPeriod);
+                        if (info != null) {
+                            int time =
+                                    ((info.get0() + info.get1())
+                                            / 2); // dayPeriod endpoints overlap, midpoint to
+                            // disambiguate
+                            String formatted = sdf.format(time);
+                            examples.add(formatted);
+                        }
+                    }
                     return formatExampleList(examples.toArray(new String[0]));
                 }
             }
diff --git a/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestExampleGenerator.java b/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestExampleGenerator.java
index a239a63f518..6eca391675e 100644
--- a/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestExampleGenerator.java
+++ b/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestExampleGenerator.java
@@ -1123,6 +1123,42 @@ private void checkDayPeriod(
         checkPathValue(exampleGenerator, path, cldrFile.getStringValue(path), expected);
     }
 
+    public void TestAllDayPeriods() { // excludes midnight, see ICU-12278
+        checkDayPeriodsForLocale(
+                "en",
+                "Bhm",
+                "〖3:00 at night〗〖9:00 in the morning〗〖12:00 noon〗〖3:00 in the afternoon〗〖7:30 in the evening〗");
+        checkDayPeriodsForLocale(
+                "it",
+                "Bhm",
+                "〖3:00 di notte〗〖9:00 di mattina〗〖12:00 mezzogiorno〗〖3:00 di pomeriggio〗〖9:00 di sera〗");
+        checkDayPeriodsForLocale(
+                "de",
+                "Bhm",
+                "〖2:30 nachts〗〖7:30 morgens〗〖11:00 vorm.〗〖12:30 mittags〗〖3:30 nachm.〗〖9:00 abends〗");
+        checkDayPeriodsForLocale("zh", "Bhm", "〖凌晨2:30〗〖早上6:30〗〖上午10:00〗〖中午12:30〗〖下午4:00〗〖晚上9:30〗");
+        checkDayPeriodsForLocale(
+                "am",
+                "EBhm",
+                "〖ሐሙስ በሌሊት 3:00〗〖ሐሙስ ጥዋት 9:00〗〖ሐሙስ ቀትር 12:00〗〖ሐሙስ ከሰዓት 3:00〗〖ሐሙስ በምሽት 9:00〗");
+        checkDayPeriodsForLocale(
+                "hi",
+                "EBhms",
+                "〖गुरु रात 2:00:00〗〖गुरु सुबह 8:00:00〗〖गुरु दोपहर 2:00:00〗〖गुरु शाम 6:00:00〗");
+    }
+
+    public void checkDayPeriodsForLocale(String localeId, String pattern, String expected) {
+        ExampleGenerator exampleGenerator = getExampleGenerator(localeId);
+        String path =
+                "//ldml/dates/calendars/calendar[@type=\"gregorian\"]"
+                        + "/dateTimeFormats/availableFormats/dateFormatItem"
+                        + "[@id=\""
+                        + pattern
+                        + "\"]";
+        String message = "Day periods with pattern \"" + pattern + "\"";
+        checkValue(message, expected, exampleGenerator, path);
+    }
+
     /**
      * Test that getExampleHtml returns same output for same input regardless of order in which it
      * is called with different inputs.