90 lines
3.3 KiB
C#
90 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text.RegularExpressions;
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namespace Ink_Canvas.Helpers
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{
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/// <summary>
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/// 渲染保存文件名模板。支持占位符: {date} {time} {datetime} {mode} {page} {count} {type}。
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/// 当模板为空、渲染结果非法或仅含分隔符时，回退到默认时间戳命名。
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/// </summary>
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public static class SaveFileNameHelper
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{
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private const string DefaultDateTime = "yyyy-MM-dd HH-mm-ss-fff";
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// Windows 保留设备名（不区分大小写）。这些名称无论是否带扩展名，CreateFile 都会失败。
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private static readonly HashSet<string> ReservedNames = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
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{
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"CON", "PRN", "AUX", "NUL",
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"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
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"LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
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};
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public static string Render(string template, SaveFileNameContext ctx)
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{
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if (ctx == null) ctx = new SaveFileNameContext();
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var now = ctx.Time ?? DateTime.Now;
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if (string.IsNullOrWhiteSpace(template))
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return now.ToString(DefaultDateTime);
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try
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{
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string result = template
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.Replace("{date}", now.ToString("yyyy-MM-dd"))
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.Replace("{time}", now.ToString("HH-mm-ss"))
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.Replace("{datetime}", now.ToString(DefaultDateTime))
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.Replace("{mode}", ctx.Mode ?? "")
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.Replace("{page}", ctx.Page?.ToString() ?? "")
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.Replace("{count}", ctx.Count?.ToString() ?? "")
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.Replace("{type}", ctx.Type ?? "");
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result = SanitizeFileName(result);
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if (string.IsNullOrWhiteSpace(result) || Regex.IsMatch(result, @"^[\s\-_]+$"))
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return now.ToString(DefaultDateTime);
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return result;
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}
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catch
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{
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return now.ToString(DefaultDateTime);
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}
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}
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private static string SanitizeFileName(string name)
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{
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if (string.IsNullOrEmpty(name)) return name;
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foreach (var c in Path.GetInvalidFileNameChars())
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{
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name = name.Replace(c, '_');
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}
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// Windows 禁止文件名以点号或空格结尾（会被静默截断甚至创建失败）。
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name = name.Trim().TrimEnd('.', ' ');
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if (string.IsNullOrEmpty(name)) return name;
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// 保留设备名：比较时忽略扩展名，命中则加下划线前缀以规避。
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var stem = Path.GetFileNameWithoutExtension(name);
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if (!string.IsNullOrEmpty(stem) && ReservedNames.Contains(stem))
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{
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name = "_" + name;
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}
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return name;
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}
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}
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public class SaveFileNameContext
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{
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public DateTime? Time { get; set; }
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/// <summary>"Annotation" or "BlackBoard" or "Screenshot" etc.</summary>
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public string Mode { get; set; }
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/// <summary>"User" or "Auto"</summary>
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public string Type { get; set; }
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public int? Page { get; set; }
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public int? Count { get; set; }
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}
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} |