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// MonoGame - Copyright (C) The MonoGame Team
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// This file is subject to the terms and conditions defined in
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// file 'LICENSE.txt', which is part of this source code package.
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using System;
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using System.IO;
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namespace MonoGame.Utilities
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{
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internal static class FileHelpers
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{
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public static readonly char ForwardSlash = '/';
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public static readonly string ForwardSlashString = new string(ForwardSlash, 1);
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public static readonly char BackwardSlash = '\\';
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#if WINRT
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public static readonly char NotSeparator = ForwardSlash;
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public static readonly char Separator = BackwardSlash;
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#else
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public static readonly char NotSeparator = Path.DirectorySeparatorChar == BackwardSlash ? ForwardSlash : BackwardSlash;
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public static readonly char Separator = Path.DirectorySeparatorChar;
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#endif
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public static string NormalizeFilePathSeparators(string name)
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{
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return name.Replace(NotSeparator, Separator);
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}
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/// <summary>
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/// Combines the filePath and relativeFile based on relativeFile being a file in the same location as filePath.
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/// Relative directory operators (..) are also resolved
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/// </summary>
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/// <example>"A\B\C.txt","D.txt" becomes "A\B\D.txt"</example>
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/// <example>"A\B\C.txt","..\D.txt" becomes "A\D.txt"</example>
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/// <param name="filePath">Path to the file we are starting from</param>
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/// <param name="relativeFile">Relative location of another file to resolve the path to</param>
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public static string ResolveRelativePath(string filePath, string relativeFile)
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{
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// Uri accepts forward slashes
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filePath = filePath.Replace(BackwardSlash, ForwardSlash);
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// Sanitize the path of double slashes, they confuse Uri
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while (filePath.Contains("//"))
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filePath = filePath.Replace("//", "/");
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bool hasForwardSlash = filePath.StartsWith(ForwardSlashString);
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if (!hasForwardSlash)
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filePath = ForwardSlashString + filePath;
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// Get a uri for filePath using the file:// schema and no host.
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var src = new Uri("file://" + filePath);
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var dst = new Uri(src, relativeFile);
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// The uri now contains the path to the relativeFile with
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// relative addresses resolved... get the local path.
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var localPath = dst.LocalPath;
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if (!hasForwardSlash && localPath.StartsWith("/"))
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localPath = localPath.Substring(1);
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// Convert the directory separator characters to the
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// correct platform specific separator.
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return NormalizeFilePathSeparators(localPath);
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}
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}
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}
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