jellyfin/Emby.Naming/Subtitles/SubtitleParser.cs
2020-11-10 19:23:10 +01:00

71 lines
2.4 KiB
C#

using System;
using System.IO;
using System.Linq;
using Emby.Naming.Common;
namespace Emby.Naming.Subtitles
{
/// <summary>
/// Subtitle Parser class.
/// </summary>
public class SubtitleParser
{
private readonly NamingOptions _options;
/// <summary>
/// Initializes a new instance of the <see cref="SubtitleParser"/> class.
/// </summary>
/// <param name="options"><see cref="NamingOptions"/> object containing SubtitleFileExtensions, SubtitleDefaultFlags, SubtitleForcedFlags and SubtitleFlagDelimiters.</param>
public SubtitleParser(NamingOptions options)
{
_options = options;
}
/// <summary>
/// Parse file to determine if is subtitle and <see cref="SubtitleInfo"/>.
/// </summary>
/// <param name="path">Path to file.</param>
/// <returns>Returns null or <see cref="SubtitleInfo"/> object if parsing is successful.</returns>
public SubtitleInfo? ParseFile(string path)
{
if (path.Length == 0)
{
return null;
}
var extension = Path.GetExtension(path);
if (!_options.SubtitleFileExtensions.Contains(extension, StringComparer.OrdinalIgnoreCase))
{
return null;
}
var flags = GetFlags(path);
var info = new SubtitleInfo(
path,
_options.SubtitleDefaultFlags.Any(i => flags.Contains(i, StringComparer.OrdinalIgnoreCase)),
_options.SubtitleForcedFlags.Any(i => flags.Contains(i, StringComparer.OrdinalIgnoreCase)));
var parts = flags.Where(i => !_options.SubtitleDefaultFlags.Contains(i, StringComparer.OrdinalIgnoreCase)
&& !_options.SubtitleForcedFlags.Contains(i, StringComparer.OrdinalIgnoreCase))
.ToList();
// Should have a name, language and file extension
if (parts.Count >= 3)
{
info.Language = parts[^2];
}
return info;
}
private string[] GetFlags(string path)
{
// Note: the tags need be be surrounded be either a space ( ), hyphen -, dot . or underscore _.
var file = Path.GetFileName(path);
return file.Split(_options.SubtitleFlagDelimiters, StringSplitOptions.RemoveEmptyEntries);
}
}
}