feat: align with upstream 1.5.9.9

app/utils/grade-class-input.ts

@@ -0,0 +1,32 @@
+// 解析班级批量输入：逗号/换行分隔；数字区间 "1-10" 生成 "1班".."10班"（上限 100 防呆）
+
+const MAX_RANGE_LENGTH = 100
+
+export const parseClassInput = (text: unknown): string[] => {
+  if (typeof text !== 'string') return []
+
+  const segments = text
+    .split(/[,，\n;；]/)
+    .map((segment) => segment.trim())
+    .filter(Boolean)
+
+  const result: string[] = []
+
+  for (const segment of segments) {
+    const rangeMatch = segment.match(/^(\d+)-(\d+)$/)
+    if (rangeMatch) {
+      const start = parseInt(rangeMatch[1], 10)
+      const end = parseInt(rangeMatch[2], 10)
+      if (start >= 1 && end >= start && end - start < MAX_RANGE_LENGTH) {
+        for (let i = start; i <= end; i++) {
+          result.push(`${i}班`)
+        }
+        continue
+      }
+    }
+
+    result.push(segment)
+  }
+
+  return [...new Set(result)]
+}