feat: add validated semester and lesson calculations

2026-10-12 23:13:02 +08:00
parent 36d18f029f
commit ae8e347e49
36 changed files with 1522 additions and 1 deletions
@@ -0,0 +1,12 @@
+class Semester {
+  Semester({required DateTime startDate, required this.totalWeeks})
+    : startDate = DateTime.utc(startDate.year, startDate.month, startDate.day) {
+    if (totalWeeks < 1 || totalWeeks > 30) {
+      throw ArgumentError('学期周数应为 1–30');
+    }
+  }
+  DateTime get firstMonday =>
+      startDate.subtract(Duration(days: startDate.weekday - 1));
+  final DateTime startDate;
+  final int totalWeeks;
+}