77 lines
2.3 KiB
Dart
77 lines
2.3 KiB
Dart
import 'package:intl/intl.dart';
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import 'datetime_extension.dart';
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/// DateFormat 构造要解析 pattern，列表里高频调用，按 pattern 缓存
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final _formatters = <String, DateFormat>{};
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DateFormat _formatterOf(String pattern) => _formatters.putIfAbsent(pattern, () => DateFormat(pattern));
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/// 可空字符串扩展
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extension StringNullableX on String? {
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DateTime? get _localDateTime {
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final value = this?.trim();
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if (value == null || value.isEmpty) return null;
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return DateTime.tryParse(value)?.toLocal();
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}
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String _format(String pattern) {
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final date = _localDateTime;
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return date == null ? '' : _formatterOf(pattern).format(date);
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}
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// ============= utc 字符串 → 各种本地格式 =============
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/// yyyy-MM-dd HH:mm:ss
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String utcToYMDHMS() => _format('yyyy-MM-dd HH:mm:ss');
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/// yyyy-MM-dd HH:mm
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String utcToYMDHM({String gap = '-'}) => _format('yyyy${gap}MM${gap}dd HH:mm');
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/// yyyy-MM-dd
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String utcToYMD({String gap = '-'}) => _format('yyyy${gap}MM${gap}dd');
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/// MM月dd日
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String utcToCnMD() {
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final date = _localDateTime;
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return date == null ? '' : '${date.month}月${date.day}日';
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}
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/// 相对时间："刚刚 / N分钟前 / N小时前 / N天前 / yyyy-MM-dd HH:mm"
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String utcToAgo({String gap = '-'}) {
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final date = _localDateTime;
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//解析不出：本来就是空值兜底“近期”，脏数据给空串
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if (date == null) return this?.trim().isNotEmpty == true ? '' : '近期';
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final diff = DateTime.now().difference(date);
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final s = diff.inSeconds;
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if (s >= 0 && s < 60) return '刚刚';
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final m = diff.inMinutes;
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if (m > 0 && m < 60) return '${m + 1}分钟前';
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final h = diff.inHours;
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if (h > 0 && h < 24) return '${h + 1}小时前';
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final d = diff.inDays;
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if (d > 0 && d < 3) return '${d + 1}天前';
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return date.ymdSMFormat(gap: gap);
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}
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}
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/// 非空字符串扩展
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extension StringX on String {
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/// 截断到最大长度
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String limit(int max) {
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if (max <= 0) return '';
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return length <= max ? this : substring(0, max);
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}
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/// 是否含 16 个以上的 0，用于识别全零设备号（如全零 UUID）
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bool hasManyZeros() {
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const zero = 0x30; //'0'
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var count = 0;
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for (var i = 0; i < length; i++) {
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if (codeUnitAt(i) == zero && ++count >= 16) return true;
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}
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return false;
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}
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}
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