feat: parse undergraduate timetable activity data

2026-10-14 23:32:27 +08:00
parent 141436f545
commit 17e4903399
5 changed files with 548 additions and 0 deletions
@@ -0,0 +1,139 @@
+class UndergraduateActivity {
+  UndergraduateActivity(
+    this.teacher,
+    this.name,
+    this.courseCode,
+    this.room,
+    this.indices,
+    this.weeks,
+  );
+  final String teacher, name, courseCode, room;
+  final Set<int> indices, weeks;
+  bool get cancelled => room == '停课';
+}
+
+List<UndergraduateActivity> parseActivityData(
+  String script, {
+  required int unitCount,
+}) {
+  if (unitCount != 12) throw const FormatException('本科节次结构无效');
+  final matches = RegExp(
+    r'new\s+TaskActivity\s*\((.*?)\)\s*;',
+    dotAll: true,
+  ).allMatches(script).toList();
+  final result = <UndergraduateActivity>[];
+  for (var i = 0; i < matches.length; i++) {
+    final m = matches[i], args = _strings(m[1]!);
+    if (args.length != 7) throw const FormatException('课程活动字段不完整');
+    final suffix = RegExp(r'\(([A-Za-z0-9_.-]+)\)$').firstMatch(args[3]);
+    if (suffix == null || args[1].trim().isEmpty || args[5].trim().isEmpty)
+      throw const FormatException('教师、教室或课程序号缺失');
+    final bitmap = args[6];
+    if (!RegExp(r'^0[01]+$').hasMatch(bitmap) ||
+        bitmap.length > 64 ||
+        (bitmap.length > 31 && bitmap.substring(31).contains('1')))
+      throw const FormatException('上课周次超出1–30周');
+    final weeks = {
+      for (var w = 1; w < bitmap.length && w <= 30; w++)
+        if (bitmap[w] == '1') w,
+    };
+    if (weeks.isEmpty) throw const FormatException('课程周次为空');
+    var end = i + 1 < matches.length ? matches[i + 1].start : script.length;
+    final finish = script.indexOf('table0.marshalTable', m.end);
+    if (finish >= 0 && finish < end) end = finish;
+    final body = script.substring(m.end, end);
+    final indices = <int>{};
+    final assignments = RegExp(r'\bindex\s*=\s*([^;]+);')
+        .allMatches(body)
+        .toList();
+    final appends = RegExp(
+      r'table\d+\.activities\[index\]\s*\[[^;]+?\]\s*=\s*activity\s*;',
+    ).allMatches(body).length;
+    if (assignments.isEmpty || assignments.length != appends)
+      throw const FormatException('课程节次赋值不完整');
+    for (final assignment in assignments) {
+      final expression = RegExp(r'^\s*(\d+)\s*\*\s*unitCount\s*\+\s*(\d+)\s*$')
+          .firstMatch(assignment[1]!);
+      if (expression == null) throw const FormatException('不支持的节次表达式');
+      final day = int.parse(expression[1]!), period = int.parse(expression[2]!);
+      if (day > 6 || period >= unitCount)
+        throw const FormatException('课程星期或节次无效');
+      indices.add(day * unitCount + period);
+    }
+    result.add(
+      UndergraduateActivity(
+        args[1].trim(),
+        args[3].substring(0, suffix.start).trim(),
+        suffix[1]!,
+        args[5].trim(),
+        indices,
+        weeks,
+      ),
+    );
+  }
+  return result;
+}
+
+/// Reads only quoted JS literals; expressions and calls are never evaluated.
+List<String> _strings(String input) {
+  final out = <String>[];
+  var p = 0;
+  void spaces() {
+    while (p < input.length && RegExp(r'\s').hasMatch(input[p])) {
+      p++;
+    }
+  }
+
+  while (true) {
+    spaces();
+    if (p >= input.length) break;
+    final quote = input[p++];
+    if (quote != '"' && quote != "'") throw const FormatException('活动参数必须为字符串');
+    final b = StringBuffer();
+    var closed = false;
+    while (p < input.length) {
+      var c = input[p++];
+      if (c == quote) {
+        closed = true;
+        break;
+      }
+      if (c == '\\') {
+        if (p >= input.length) throw const FormatException('字符串转义不完整');
+        c = input[p++];
+        const escapes = {
+          'n': '\n',
+          'r': '\r',
+          't': '\t',
+          'b': '\b',
+          'f': '\f',
+          'v': '\u000b',
+          '0': '\u0000',
+        };
+        if (c == 'u' || c == 'x') {
+          final count = c == 'u' ? 4 : 2;
+          if (p + count > input.length) throw const FormatException('字符串转义无效');
+          final hex = input.substring(p, p + count);
+          if (!RegExp(r'^[0-9a-fA-F]+$').hasMatch(hex))
+            throw const FormatException('字符串转义无效');
+          b.writeCharCode(int.parse(hex, radix: 16));
+          p += count;
+        } else if (escapes.containsKey(c)) {
+          b.write(escapes[c]);
+        } else if (const ['"', "'", '\\', '/'].contains(c)) {
+          b.write(c);
+        } else {
+          throw const FormatException('不支持的字符串转义');
+        }
+      } else {
+        if (c == '\n' || c == '\r') throw const FormatException('字符串未闭合');
+        b.write(c);
+      }
+    }
+    if (!closed) throw const FormatException('字符串未闭合');
+    out.add(b.toString());
+    spaces();
+    if (p == input.length) break;
+    if (input[p++] != ',') throw const FormatException('活动字段分隔无效');
+  }
+  return out;
+}