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feat: modernize to .NET 8, split into Core/Cli/Gui (#3)
* feat: modernize to .NET 8, split into Core/Cli/Gui projects Core: shared converter library (cross-platform) Cli: console app with CLI args (cross-platform) Gui: WinForms app (Windows only, uses Core library) - Split into 3 projects sharing ConvertSRTto3DASS.Core - Rewrite SrtConverter with clean public API - Add CLI entry point with stdlib argument parsing - Redesign GUI with GroupBox layout, flat buttons, modern fonts - Update README with publish commands * feat: add drag-and-drop to GUI * refactor: rename GUI controls to proper PascalCase identifiers --------- Co-authored-by: imrayya <imrayya@users.noreply.github.com>
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using System.Text;
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using System.Text.RegularExpressions;
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namespace ConvertSRTto3DASS;
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/// <summary>
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/// Core SRT-to-ASS conversion logic for 3D subtitle formats.
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/// </summary>
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public static class SrtConverter
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{
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public class ConversionResult
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{
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public string OutputText { get; set; } = "";
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public int SubtitleCount { get; set; }
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}
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public static ConversionResult Convert(ConversionOptions options)
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{
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var srtText = ReadSrt(options.InputPath);
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var subtitles = ParseSrt(srtText);
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var header = CreateHeader(options);
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var styles = CreateStyles(options);
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var events = GenerateEvents(subtitles, options);
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var output =
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"[Script Info]\n" +
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header +
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"\n\n[V4+ Styles]\n" +
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styles +
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"\n\n[Events]\n" +
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events;
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File.WriteAllText(options.OutputPath, output, new UTF8Encoding(encoderShouldEmitUTF8Identifier: true));
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return new ConversionResult
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{
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OutputText = output,
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SubtitleCount = subtitles.Count
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};
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}
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#region SRT Parsing
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private static string ReadSrt(string path)
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{
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using var reader = new StreamReader(path, Encoding.UTF8, detectEncodingFromByteOrderMarks: true);
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var text = reader.ReadToEnd();
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// Fallback to Windows-1252 if we see replacement characters
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if (text.Contains('\uFFFD'))
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text = File.ReadAllText(path, Encoding.GetEncoding(1252));
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return text;
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}
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private static List<SrtSubtitle> ParseSrt(string srtText)
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{
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var results = new List<SrtSubtitle>();
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srtText = srtText.Replace("\r\n", "\n").Replace("\r", "\n").Trim();
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var blocks = Regex.Split(srtText, @"\n\s*\n");
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int expectedNumber = 1;
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foreach (var block in blocks)
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{
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var lines = block.Split('\n', StringSplitOptions.TrimEntries)
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.Where(l => l.Length > 0)
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.ToList();
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if (lines.Count < 3) continue;
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if (!int.TryParse(lines[0], out var number)) continue;
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if (number != expectedNumber)
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{
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Console.Error.WriteLine($"Warning: expected subtitle number {expectedNumber}, but found {number}.");
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expectedNumber = number;
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}
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expectedNumber++;
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var timeMatch = Regex.Match(lines[1],
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@"^(?<start>\d{2}:\d{2}:\d{2},\d{3})\s*-->\s*(?<end>\d{2}:\d{2}:\d{2},\d{3})$");
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if (!timeMatch.Success)
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{
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Console.Error.WriteLine($"Skipping malformed timestamp: [{lines[1]}]");
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continue;
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}
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var text = string.Join("\\N", lines.Skip(2));
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text = NormalizeFormatting(text);
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results.Add(new SrtSubtitle
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{
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Start = timeMatch.Groups["start"].Value,
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End = timeMatch.Groups["end"].Value,
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Text = text
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});
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}
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return results;
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}
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#endregion
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#region Formatting
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private static readonly Dictionary<Regex, string> _tagReplacements = new()
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{
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{ new Regex("<b>", RegexOptions.IgnoreCase), "{\\b1}" },
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{ new Regex("</b>", RegexOptions.IgnoreCase), "{\\b0}" },
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{ new Regex("<i>", RegexOptions.IgnoreCase), "{\\i1}" },
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{ new Regex("</i>", RegexOptions.IgnoreCase), "{\\i0}" },
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{ new Regex("<u>", RegexOptions.IgnoreCase), "{\\u1}" },
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{ new Regex("</u>", RegexOptions.IgnoreCase), "{\\u0}" },
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{ new Regex("</font>", RegexOptions.IgnoreCase), "{\\c&HFFFFFF&}" }
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};
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private static readonly Regex _colorRegex =
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new Regex("<font color=\"#([0-9A-Fa-f]{6})\">", RegexOptions.IgnoreCase);
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private static readonly Regex _markupRegex =
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new Regex("<.+?>|(\\r)", RegexOptions.IgnoreCase);
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private static string NormalizeFormatting(string text)
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{
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foreach (var (pattern, replacement) in _tagReplacements)
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text = pattern.Replace(text, replacement);
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// Convert HTML color to ASS BBGGRR format
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while (_colorRegex.IsMatch(text))
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{
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var match = _colorRegex.Match(text);
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var rgb = match.Groups[1].Value;
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var assColor = rgb.Substring(4, 2) + rgb.Substring(2, 2) + rgb.Substring(0, 2);
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text = _colorRegex.Replace(text, "{\\c&H" + assColor + "&}", 1);
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}
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return _markupRegex.Replace(text, "");
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}
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#endregion
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#region Time & Scaling
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private static string ConvertTimestamp(string timestamp)
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{
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var tmp = timestamp.Substring(1);
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tmp = tmp.Substring(0, tmp.Length - 1);
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return tmp.Replace(",", ".");
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}
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private static int ScaleX(int value, ConversionOptions o) =>
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(int)Math.Round(value * (o.ResX / (double)o.BaseResX));
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private static int ScaleY(int value, ConversionOptions o) =>
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(int)Math.Round(value * (o.ResY / (double)o.BaseResY));
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private static int ScaleFont(int fontSize, ConversionOptions o) =>
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Math.Max(1, ScaleY(fontSize, o));
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#endregion
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#region ASS Output Generation
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private static string CreateHeader(ConversionOptions o) =>
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$"; Generated by SRTto3Dsubtitles\n" +
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$"Title: {Path.GetFileNameWithoutExtension(o.InputPath)}\n" +
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"ScriptType: v4.00+\n" +
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"Collisions: Normal\n" +
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$"PlayResX: {o.ResX}\n" +
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$"PlayResY: {o.ResY}\n" +
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"ScaledBorderAndShadow: yes";
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private static string CreateStyles(ConversionOptions o)
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{
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var fontSize = ScaleFont(o.FontSize, o);
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return o.Mode.ToLowerInvariant() switch
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{
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"ou" => CreateOuStyles(fontSize, o),
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"rg" => CreateRgStyles(fontSize, o),
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_ => CreateSbsStyles(fontSize, o)
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};
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}
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private static string CreateSbsStyles(int fontSize, ConversionOptions o)
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{
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var sideMargin = ScaleX(o.SbsSideMargin, o);
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var verticalMargin = ScaleY(o.VerticalMargin, o);
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return FormatStyle("Right", fontSize, sideMargin, 0, verticalMargin) + "\n" +
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FormatStyle("Left", fontSize, 0, sideMargin, verticalMargin);
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}
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private static string CreateOuStyles(int fontSize, ConversionOptions o)
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{
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var topMargin = ScaleY(o.OuTopMargin, o);
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var bottomMargin = ScaleY(o.VerticalMargin, o);
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return FormatStyle("Top", fontSize, 0, 0, topMargin) + "\n" +
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FormatStyle("Bottom", fontSize, 0, 0, bottomMargin);
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}
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private static string CreateRgStyles(int fontSize, ConversionOptions o)
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{
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var verticalMargin = ScaleY(o.VerticalMargin, o);
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// Red = &H0000FF, Green = &H00FF00 (ASS uses BBGGRR)
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return FormatStyle("RedEye", fontSize, 0, 0, verticalMargin, primary: "&H0000FF") + "\n" +
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FormatStyle("GreenEye", fontSize, 0, 0, verticalMargin, primary: "&H00FF00");
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}
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private static string FormatStyle(string name, int fontSize, int marginL, int marginR, int marginV,
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string primary = "&HFFFFFF")
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{
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return $"Style: {name},Arial,{fontSize},{primary},{primary},&H000000,&H000000," +
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$"0,0,0,0,100,100,0,0,1,1,0,2," +
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$"{marginL},{marginR},{marginV},0";
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}
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private static string GenerateEvents(List<SrtSubtitle> subs, ConversionOptions o)
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{
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var sb = new StringBuilder();
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sb.AppendLine("Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text");
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foreach (var sub in subs)
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{
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var start = ConvertTimestamp(sub.Start);
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var end = ConvertTimestamp(sub.End);
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var text = sub.Text;
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switch (o.Mode.ToLowerInvariant())
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{
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case "sbs":
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sb.AppendLine($"Dialogue: 0,{start},{end},Right,,0,0,0,,{text}");
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sb.AppendLine($"Dialogue: 1,{start},{end},Left,,0,0,0,,{text}");
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break;
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case "ou":
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sb.AppendLine($"Dialogue: 0,{start},{end},Top,,0,0,0,,{text}");
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sb.AppendLine($"Dialogue: 1,{start},{end},Bottom,,0,0,0,,{text}");
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break;
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case "rg":
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var centerX = o.ResX / 2;
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var scaledBottomOffset = ScaleY(o.BottomOffset, o);
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var y = o.ResY - scaledBottomOffset;
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var scaledOffsetX = ScaleX(o.OffsetX, o);
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var redX = centerX - scaledOffsetX;
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var greenX = centerX + scaledOffsetX;
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sb.AppendLine($"Dialogue: 0,{start},{end},RedEye,,0,0,0,,{{\\an2\\pos({redX},{y})}}{text}");
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sb.AppendLine($"Dialogue: 1,{start},{end},GreenEye,,0,0,0,,{{\\an2\\pos({greenX},{y})}}{text}");
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break;
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}
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}
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return sb.ToString();
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}
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#endregion
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#region Data Classes
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private class SrtSubtitle
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{
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public string Start { get; set; } = "";
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public string End { get; set; } = "";
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public string Text { get; set; } = "";
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}
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#endregion
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}
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