repo creation with initial code after cloning public repo
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.IO;
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using MediaBrowser.Common.Providers;
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namespace Emby.Server.Implementations.Library
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{
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/// <summary>
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/// Class providing extension methods for working with paths.
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/// </summary>
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public static class PathExtensions
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{
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/// <summary>
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/// Gets the attribute value.
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/// </summary>
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/// <param name="str">The STR.</param>
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/// <param name="attribute">The attrib.</param>
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/// <returns>System.String.</returns>
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/// <exception cref="ArgumentException"><paramref name="str" /> or <paramref name="attribute" /> is empty.</exception>
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public static string? GetAttributeValue(this ReadOnlySpan<char> str, ReadOnlySpan<char> attribute)
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{
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if (str.Length == 0)
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{
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throw new ArgumentException("String can't be empty.", nameof(str));
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}
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if (attribute.Length == 0)
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{
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throw new ArgumentException("String can't be empty.", nameof(attribute));
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}
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var attributeIndex = str.IndexOf(attribute, StringComparison.OrdinalIgnoreCase);
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// Must be at least 3 characters after the attribute =, ], any character,
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// then we offset it by 1, because we want the index and not length.
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var maxIndex = str.Length - attribute.Length - 2;
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while (attributeIndex > -1 && attributeIndex < maxIndex)
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{
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var attributeEnd = attributeIndex + attribute.Length;
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if (attributeIndex > 0)
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{
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var attributeOpener = str[attributeIndex - 1];
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var attributeCloser = attributeOpener switch
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{
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'[' => ']',
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'(' => ')',
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'{' => '}',
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_ => '\0'
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};
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if (attributeCloser != '\0' && (str[attributeEnd] == '=' || str[attributeEnd] == '-'))
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{
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var closingIndex = str[attributeEnd..].IndexOf(attributeCloser);
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// Must be at least 1 character before the closing bracket.
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if (closingIndex > 1)
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{
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return str[(attributeEnd + 1)..(attributeEnd + closingIndex)].Trim().ToString();
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}
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}
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}
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str = str[attributeEnd..];
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attributeIndex = str.IndexOf(attribute, StringComparison.OrdinalIgnoreCase);
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}
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// for imdbid we also accept pattern matching
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if (attribute.Equals("imdbid", StringComparison.OrdinalIgnoreCase))
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{
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var match = ProviderIdParsers.TryFindImdbId(str, out var imdbId);
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return match ? imdbId.ToString() : null;
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}
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return null;
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}
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/// <summary>
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/// Replaces a sub path with another sub path and normalizes the final path.
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/// </summary>
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/// <param name="path">The original path.</param>
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/// <param name="subPath">The original sub path.</param>
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/// <param name="newSubPath">The new sub path.</param>
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/// <param name="newPath">The result of the sub path replacement.</param>
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/// <returns>The path after replacing the sub path.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="path" />, <paramref name="newSubPath" /> or <paramref name="newSubPath" /> is empty.</exception>
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public static bool TryReplaceSubPath(
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[NotNullWhen(true)] this string? path,
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[NotNullWhen(true)] string? subPath,
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[NotNullWhen(true)] string? newSubPath,
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[NotNullWhen(true)] out string? newPath)
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{
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newPath = null;
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if (string.IsNullOrEmpty(path)
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|| string.IsNullOrEmpty(subPath)
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|| string.IsNullOrEmpty(newSubPath)
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|| subPath.Length > path.Length)
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{
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return false;
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}
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subPath = subPath.NormalizePath(out var newDirectorySeparatorChar);
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path = path.NormalizePath(newDirectorySeparatorChar);
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// We have to ensure that the sub path ends with a directory separator otherwise we'll get weird results
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// when the sub path matches a similar but in-complete subpath
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var oldSubPathEndsWithSeparator = subPath[^1] == newDirectorySeparatorChar;
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if (!path.StartsWith(subPath, StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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if (path.Length > subPath.Length
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&& !oldSubPathEndsWithSeparator
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&& path[subPath.Length] != newDirectorySeparatorChar)
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{
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return false;
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}
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var newSubPathTrimmed = newSubPath.AsSpan().TrimEnd(newDirectorySeparatorChar);
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// Ensure that the path with the old subpath removed starts with a leading dir separator
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int idx = oldSubPathEndsWithSeparator ? subPath.Length - 1 : subPath.Length;
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newPath = string.Concat(newSubPathTrimmed, path.AsSpan(idx));
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return true;
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}
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/// <summary>
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/// Retrieves the full resolved path and normalizes path separators to the <see cref="Path.DirectorySeparatorChar"/>.
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/// </summary>
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/// <param name="path">The path to canonicalize.</param>
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/// <returns>The fully expanded, normalized path.</returns>
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public static string Canonicalize(this string path)
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{
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return Path.GetFullPath(path).NormalizePath();
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}
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/// <summary>
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/// Normalizes the path's directory separator character to the currently defined <see cref="Path.DirectorySeparatorChar"/>.
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/// </summary>
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/// <param name="path">The path to normalize.</param>
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/// <returns>The normalized path string or <see langword="null"/> if the input path is null or empty.</returns>
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[return: NotNullIfNotNull(nameof(path))]
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public static string? NormalizePath(this string? path)
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{
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return path.NormalizePath(Path.DirectorySeparatorChar);
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}
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/// <summary>
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/// Normalizes the path's directory separator character.
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/// </summary>
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/// <param name="path">The path to normalize.</param>
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/// <param name="separator">The separator character the path now uses or <see langword="null"/>.</param>
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/// <returns>The normalized path string or <see langword="null"/> if the input path is null or empty.</returns>
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[return: NotNullIfNotNull(nameof(path))]
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public static string? NormalizePath(this string? path, out char separator)
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{
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if (string.IsNullOrEmpty(path))
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{
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separator = default;
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return path;
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}
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var newSeparator = '\\';
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// True normalization is still not possible https://github.com/dotnet/runtime/issues/2162
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// The reasoning behind this is that a forward slash likely means it's a Linux path and
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// so the whole path should be normalized to use / and vice versa for Windows (although Windows doesn't care much).
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if (path.Contains('/', StringComparison.Ordinal))
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{
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newSeparator = '/';
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}
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separator = newSeparator;
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return path.NormalizePath(newSeparator);
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}
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/// <summary>
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/// Normalizes the path's directory separator character to the specified character.
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/// </summary>
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/// <param name="path">The path to normalize.</param>
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/// <param name="newSeparator">The replacement directory separator character. Must be a valid directory separator.</param>
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/// <returns>The normalized path.</returns>
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/// <exception cref="ArgumentException">Thrown if the new separator character is not a directory separator.</exception>
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[return: NotNullIfNotNull(nameof(path))]
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public static string? NormalizePath(this string? path, char newSeparator)
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{
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const char Bs = '\\';
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const char Fs = '/';
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if (!(newSeparator == Bs || newSeparator == Fs))
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{
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throw new ArgumentException("The character must be a directory separator.");
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}
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if (string.IsNullOrEmpty(path))
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{
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return path;
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}
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return newSeparator == Bs ? path.Replace(Fs, newSeparator) : path.Replace(Bs, newSeparator);
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}
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}
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}
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