✨ ext/reprise/src/ruby_api/recurrence_modifiers/by_weekday.rs

ext/reprise/src/ruby_api/recurrence_modifiers/by_weekday.rs

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+use chrono::Weekday;
+use crate::ruby_api::recurrence_modifiers::modifiable::Modifiable;
+
+/// The ByWeekday modifier corresponds to iCalendar's:
+/// bywdaylist = ( weekdaynum *("," weekdaynum) )
+/// NB. `bywdaylist` seems improperly specified.
+/// weekdaynum  = [[plus / minus] ordwk] weekday
+/// weekday = "SU" / "MO" / "TU" / "WE" / "TH" / "FR" / "SA"
+/// ordwk = 1*2DIGIT; 1 to 53
+/// The BYDAY rule part specifies a COMMA-separated list of days of the week;
+/// SU indicates Sunday; MO indicates Monday; TU indicates Tuesday;
+/// WE indicates Wednesday; TH indicates Thursday; FR indicates
+/// Friday; and SA indicates Saturday.
+/// Each BYDAY value can also be preceded by a positive (+n) or
+/// negative (-n) integer. If present, this indicates the nth occurrence
+/// of a specific day within the MONTHLY or YEARLY "RRULE". For example,
+/// within a MONTHLY rule, +1MO (or simply 1MO) represents the first
+/// Monday within the month, whereas -1MO represents the last Monday
+/// of the month. The numeric value in a BYDAY rule part with the FREQ
+/// rule part set to YEARLY corresponds to an offset within the month
+/// when the BYMONTH rule part is present, and corresponds to an offset
+/// within the year when the BYWEEKNO or BYMONTH rule parts are present.
+/// If an integer modifier is not present, it means all days of this type
+/// within the specified frequency. For example, within a MONTHLY rule,
+/// MO represents all Mondays within the month. The BYDAY rule part
+/// MUST NOT be specified with a numeric value when the FREQ rule part
+/// is not set to MONTHLY or YEARLY. Furthermore, the BYDAY rule part
+/// MUST NOT be specified with a numeric value with the FREQ rule part
+/// set to YEARLY when the BYWEEKNO rule part is specified.
+/// See: https://icalendar.org/iCalendar-RFC-5545/3-3-10-recurrence-rule.html
+#[derive(Debug, Clone)]
+pub(crate) struct ByWeekday {
+    pub(crate) nth_occurrence: Option<i8>,
+    pub(crate) weekday: Weekday,
+}
+
+impl Modifiable for ByWeekday {
+}