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85 lines
3.2 KiB
Swift
85 lines
3.2 KiB
Swift
import Foundation
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/// 上游返回的时间戳格式并不统一（`yyyy-MM-dd HH:mm:ss`、ISO8601、秒/毫秒时间戳都出现过），
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/// 列表里需要一个稳定的短读法，解析不出来时原样回退，避免出现"--"这种假结论。
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public enum TimestampText {
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private static let parsers: [DateFormatter] = {
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let patterns = [
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"yyyy-MM-dd HH:mm:ss",
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"yyyy-MM-dd'T'HH:mm:ss",
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"yyyy-MM-dd HH:mm",
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"yyyy/MM/dd HH:mm:ss",
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"yyyy-MM-dd",
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]
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return patterns.map { pattern in
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let formatter = DateFormatter()
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formatter.locale = Locale(identifier: "en_US_POSIX")
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formatter.calendar = Calendar(identifier: .gregorian)
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formatter.timeZone = .current
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formatter.dateFormat = pattern
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return formatter
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}
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}()
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private static let utcParser: DateFormatter = {
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let formatter = DateFormatter()
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formatter.locale = Locale(identifier: "en_US_POSIX")
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formatter.calendar = Calendar(identifier: .gregorian)
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formatter.timeZone = TimeZone(secondsFromGMT: 0)
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formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
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return formatter
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}()
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private static let timeFormat: DateFormatter = {
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let formatter = DateFormatter()
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formatter.locale = Locale(identifier: "zh_CN")
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formatter.dateFormat = "HH:mm"
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return formatter
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}()
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private static let monthDayFormat: DateFormatter = {
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let formatter = DateFormatter()
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formatter.locale = Locale(identifier: "zh_CN")
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formatter.dateFormat = "MM-dd HH:mm"
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return formatter
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}()
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private static let fullFormat: DateFormatter = {
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let formatter = DateFormatter()
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formatter.locale = Locale(identifier: "zh_CN")
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formatter.dateFormat = "yyyy-MM-dd"
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return formatter
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}()
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public static func date(from raw: String) -> Date? {
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let text = raw.trimmingCharacters(in: .whitespacesAndNewlines)
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guard text.isEmpty == false else { return nil }
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if let number = Double(text), text.allSatisfy({ $0.isNumber }) {
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// 13 位是毫秒，10 位是秒。
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return Date(timeIntervalSince1970: text.count > 11 ? number / 1000 : number)
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}
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let head = text.hasSuffix("Z") ? String(text.dropLast()) : text
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for parser in parsers {
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if let parsed = parser.date(from: head) {
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return text.hasSuffix("Z") ? utcParser.date(from: head) ?? parsed : parsed
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}
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}
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return nil
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}
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/// 今天只看时分，今年看月日，跨年才写全年份。
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public static func short(_ raw: String, now: Date = Date()) -> String {
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guard let parsed = date(from: raw) else {
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return raw.trimmingCharacters(in: .whitespacesAndNewlines)
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}
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let calendar = Calendar.current
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if calendar.isDate(parsed, inSameDayAs: now) {
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return timeFormat.string(from: parsed)
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}
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if calendar.isDate(parsed, equalTo: now, toGranularity: .year) {
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return monthDayFormat.string(from: parsed)
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}
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return fullFormat.string(from: parsed)
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}
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}
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