using System;
using System.IO;
namespace Microsoft.Xna.Framework.Utilities
{
internal static class FileHelpers
{
public static readonly char ForwardSlash = '/';
public static readonly string ForwardSlashString = new string(ForwardSlash, 1);
public static readonly char BackwardSlash = '\\';
#if WINRT
public static readonly char NotSeparator = ForwardSlash;
public static readonly char Separator = BackwardSlash;
#else
public static readonly char NotSeparator = Path.DirectorySeparatorChar == BackwardSlash ? ForwardSlash : BackwardSlash;
public static readonly char Separator = Path.DirectorySeparatorChar;
#endif
public static string NormalizeFilePathSeparators(string name)
{
return name.Replace(NotSeparator, Separator);
}
/// <summary>
/// Combines the filePath and relativeFile based on relativeFile being a file in the same location as filePath.
/// Relative directory operators (..) are also resolved
/// </summary>
/// <example>"A\B\C.txt","D.txt" becomes "A\B\D.txt"</example>
/// <example>"A\B\C.txt","..\D.txt" becomes "A\D.txt"</example>
/// <param name="filePath">Path to the file we are starting from</param>
/// <param name="relativeFile">Relative location of another file to resolve the path to</param>
public static string ResolveRelativePath(string filePath, string relativeFile)
{
filePath = filePath.Replace(BackwardSlash, ForwardSlash);
bool hasForwardSlash = filePath.StartsWith(ForwardSlashString);
if (!hasForwardSlash)
filePath = ForwardSlashString + filePath;
var src = new Uri("file://" + filePath);
var dst = new Uri(src, relativeFile);
var localPath = dst.LocalPath;
if (!hasForwardSlash && localPath.StartsWith("/"))
localPath = localPath.Substring(1);
return NormalizeFilePathSeparators(localPath);
}
}
}
