LibJS+LibUnicode: Supply field type in CalendarPattern's for-each method

Some callers will want different behavior depending on what field is
being provided to the callback.

2 files changed, 30 insertions, 16 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
index dd4bfa5894..9f7ad9c14f 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
@@ -249,7 +249,7 @@ ThrowCompletionOr<DateTimeFormat*> initialize_date_time_format(GlobalObject& glo
         return &date_time_format;
 
     // 38. For each row in Table 4, except the header row, in table order, do
-    date_time_format.for_each_calendar_field_zipped_with(*best_format, [&](auto& date_time_format_field, auto const& best_format_field) {
+    date_time_format.for_each_calendar_field_zipped_with(*best_format, [&](auto& date_time_format_field, auto const& best_format_field, auto) {
         // a. Let prop be the name given in the Property column of the row.
         // b. If bestFormat has a field [[<prop>]], then
         if (best_format_field.has_value()) {
@@ -490,12 +490,12 @@ Optional<Unicode::CalendarPattern> date_time_style_format(StringView data_locale
         Unicode::CalendarPattern format {};
 
         // b. Add to format all fields from dateFormat except [[pattern]] and [[rangePatterns]].
-        format.for_each_calendar_field_zipped_with(date_format, [](auto& format_field, auto const& date_format_field) {
+        format.for_each_calendar_field_zipped_with(date_format, [](auto& format_field, auto const& date_format_field, auto) {
             format_field = date_format_field;
         });
 
         // c. Add to format all fields from timeFormat except [[pattern]], [[rangePatterns]], [[pattern12]], and [[rangePatterns12]], if present.
-        format.for_each_calendar_field_zipped_with(time_format, [](auto& format_field, auto const& time_format_field) {
+        format.for_each_calendar_field_zipped_with(time_format, [](auto& format_field, auto const& time_format_field, auto) {
             if (time_format_field.has_value())
                 format_field = time_format_field;
         });
@@ -577,7 +577,7 @@ Optional<Unicode::CalendarPattern> basic_format_matcher(Unicode::CalendarPattern
         int score = 0;
 
         // b. For each property name property shown in Table 4, do
-        format.for_each_calendar_field_zipped_with(options, [&](auto const& format_prop, auto const& options_prop) {
+        format.for_each_calendar_field_zipped_with(options, [&](auto const& format_prop, auto const& options_prop, auto) {
             using ValueType = typename RemoveReference<decltype(options_prop)>::ValueType;
 
             // i. If options has a field [[<property>]], let optionsProp be options.[[<property>]]; else let optionsProp be undefined.
@@ -659,7 +659,7 @@ Optional<Unicode::CalendarPattern> basic_format_matcher(Unicode::CalendarPattern
     //
     // Rather than generating an prohibitively large amount of nearly-duplicate patterns, which only
     // differ by field length, we expand the field lengths here.
-    best_format->for_each_calendar_field_zipped_with(options, [](auto& best_format_field, auto const& option_field) {
+    best_format->for_each_calendar_field_zipped_with(options, [](auto& best_format_field, auto const& option_field, auto) {
         if (best_format_field.has_value() && option_field.has_value())
             best_format_field = option_field;
     });
diff --git a/Userland/Libraries/LibUnicode/DateTimeFormat.h b/Userland/Libraries/LibUnicode/DateTimeFormat.h
index 37209de79c..25c2453c85 100644
--- a/Userland/Libraries/LibUnicode/DateTimeFormat.h
+++ b/Userland/Libraries/LibUnicode/DateTimeFormat.h
@@ -31,20 +31,34 @@ enum class CalendarPatternStyle : u8 {
 };
 
 struct CalendarPattern {
+    enum class Field {
+        Era,
+        Year,
+        Month,
+        Weekday,
+        Day,
+        DayPeriod,
+        Hour,
+        Minute,
+        Second,
+        FractionalSecondDigits,
+        TimeZoneName,
+    };
+
     template<typename Callback>
     void for_each_calendar_field_zipped_with(CalendarPattern const& other, Callback&& callback)
     {
-        callback(era, other.era);
-        callback(year, other.year);
-        callback(month, other.month);
-        callback(weekday, other.weekday);
-        callback(day, other.day);
-        callback(day_period, other.day_period);
-        callback(hour, other.hour);
-        callback(minute, other.minute);
-        callback(second, other.second);
-        callback(fractional_second_digits, other.fractional_second_digits);
-        callback(time_zone_name, other.time_zone_name);
+        callback(era, other.era, Field::Era);
+        callback(year, other.year, Field::Year);
+        callback(month, other.month, Field::Month);
+        callback(weekday, other.weekday, Field::Weekday);
+        callback(day, other.day, Field::Day);
+        callback(day_period, other.day_period, Field::DayPeriod);
+        callback(hour, other.hour, Field::Hour);
+        callback(minute, other.minute, Field::Minute);
+        callback(second, other.second, Field::Second);
+        callback(fractional_second_digits, other.fractional_second_digits, Field::FractionalSecondDigits);
+        callback(time_zone_name, other.time_zone_name, Field::TimeZoneName);
     }
 
     String pattern {};