113 lines
2.1 KiB
C#
113 lines
2.1 KiB
C#
#if !(LINUX || MACOS || WINDOWS)
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#define TARGET_ANY
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#endif
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#if TARGET_ANY || LINUX
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#define TARGET_LINUX
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#endif
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#if TARGET_ANY || MACOS
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#define TARGET_MACOS
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#endif
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#if TARGET_ANY || WINDOWS
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#define TARGET_WINDOWS
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#endif
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using System.Buffers;
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using CommunityToolkit.HighPerformance.Buffers;
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namespace System.IO;
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public static class PathEx
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{
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public static string ExpandPath(string path)
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{
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#if TARGET_ANY
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if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
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{
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#endif
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#if TARGET_LINUX || TARGET_MACOS
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return ExpandPathUnixImpl(path);
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#endif
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#if TARGET_ANY
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}
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else if (OperatingSystem.IsWindows())
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{
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#endif
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#if TARGET_WINDOWS
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return ExpandPathWindowsImpl(path);
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#endif
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#if TARGET_ANY
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}
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else
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{
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throw new PlatformNotSupportedException();
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}
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#endif
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}
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#if TARGET_LINUX || TARGET_MACOS
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private static string ExpandPathUnixImpl(string path)
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{
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if (string.IsNullOrWhiteSpace(path))
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{
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return path;
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}
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var reader = new SequenceReader<char>(new(path.AsMemory()));
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if (!reader.TryReadTo(out ReadOnlySpan<char> read, '$'))
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{
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return path;
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}
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using ArrayPoolBufferWriter<char> result = new();
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while (true)
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{
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result.Write(read);
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int skip = 0;
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if (reader.UnreadSpan[0] == '{' && reader.UnreadSpan.IndexOf('}') is not -1 and int s)
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{
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read = reader.UnreadSpan[1..s];
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skip = s + 1;
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}
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else
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{
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var propertyReader = new SequenceReader<char>(reader.UnreadSequence);
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while (!propertyReader.End && propertyReader.UnreadSpan[0] is char c && (c == '_' || char.IsAsciiLetterOrDigit(c)))
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{
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propertyReader.Advance(1);
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}
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read = reader.UnreadSpan[..(int)propertyReader.Consumed];
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skip = read.Length;
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}
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if (skip != 0 && Environment.GetEnvironmentVariable(read.ToString()) is { } env)
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{
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result.Write(env);
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reader.Advance(skip);
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}
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else
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{
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result.Write(['$']);
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}
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if (!reader.TryReadTo(out read, '$'))
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{
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break;
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}
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}
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result.Write(reader.UnreadSpan);
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return result.WrittenSpan.ToString();
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}
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#endif
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#if TARGET_WINDOWS
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private static string ExpandPathWindowsImpl(string path)
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{
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return Environment.ExpandEnvironmentVariables(path);
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}
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#endif
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}
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