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82 lines
2.6 KiB
C#
82 lines
2.6 KiB
C#
using System;
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using Emby.Naming.Common;
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namespace Emby.Naming.Video
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{
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/// <summary>
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/// Parse 3D format related flags.
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/// </summary>
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public static class Format3DParser
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{
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// Static default result to save on allocation costs.
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private static readonly Format3DResult _defaultResult = new (false, null);
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/// <summary>
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/// Parse 3D format related flags.
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/// </summary>
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/// <param name="path">Path to file.</param>
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/// <param name="namingOptions">The naming options.</param>
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/// <returns>Returns <see cref="Format3DResult"/> object.</returns>
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public static Format3DResult Parse(ReadOnlySpan<char> path, NamingOptions namingOptions)
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{
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int oldLen = namingOptions.VideoFlagDelimiters.Length;
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Span<char> delimiters = stackalloc char[oldLen + 1];
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namingOptions.VideoFlagDelimiters.AsSpan().CopyTo(delimiters);
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delimiters[oldLen] = ' ';
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return Parse(path, delimiters, namingOptions);
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}
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private static Format3DResult Parse(ReadOnlySpan<char> path, ReadOnlySpan<char> delimiters, NamingOptions namingOptions)
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{
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foreach (var rule in namingOptions.Format3DRules)
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{
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var result = Parse(path, rule, delimiters);
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if (result.Is3D)
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{
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return result;
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}
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}
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return _defaultResult;
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}
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private static Format3DResult Parse(ReadOnlySpan<char> path, Format3DRule rule, ReadOnlySpan<char> delimiters)
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{
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bool is3D = false;
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string? format3D = null;
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// If there's no preceding token we just consider it found
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var foundPrefix = string.IsNullOrEmpty(rule.PrecedingToken);
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while (path.Length > 0)
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{
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var index = path.IndexOfAny(delimiters);
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if (index == -1)
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{
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index = path.Length - 1;
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}
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var currentSlice = path[..index];
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path = path[(index + 1)..];
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if (!foundPrefix)
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{
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foundPrefix = currentSlice.Equals(rule.PrecedingToken, StringComparison.OrdinalIgnoreCase);
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continue;
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}
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is3D = foundPrefix && currentSlice.Equals(rule.Token, StringComparison.OrdinalIgnoreCase);
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if (is3D)
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{
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format3D = rule.Token;
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break;
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}
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}
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return is3D ? new Format3DResult(true, format3D) : _defaultResult;
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}
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}
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}
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