public static string NormalizeRelativePath(string relative, bool forceTrailingSlash = false)
{
if (string.IsNullOrEmpty(relative))
{
throw new System.ArgumentException("Empty or null", "relative");
}
StringBuilder output = new StringBuilder(relative.Length);
NormalizeState state = NormalizeState.PrevSlash;
output.Append('/');
int startIndex = 0;
int lastIndexPlus1 = relative.Length;
if (relative[0] == '"' && relative.Length > 2 && relative[relative.Length - 1] == '"')
{
startIndex++;
lastIndexPlus1--;
}
for (int i = startIndex; i <= lastIndexPlus1; ++i)
{
if (i == lastIndexPlus1 || relative[i] == '/' || relative[i] == '\\')
{
if (state == NormalizeState.PrevSlash || state == NormalizeState.PrevDot)
{
// do nothing
}
else if (state == NormalizeState.PrevDoubleDot)
{
if (output.Length == 1)
{
throw new System.IO.IOException("Invalid path: double dot error (before " + i + ")");
}
// on level up!
int j;
for (j = output.Length - 2; j >= 0 && output[j] != '/'; --j)
{
}
output.Remove(j + 1, output.Length - j - 1);
}
else if (i < lastIndexPlus1 || forceTrailingSlash)
{
output.Append('/');
}
state = NormalizeState.PrevSlash;
}
else if (relative[i] == '.')
{
if (state == NormalizeState.PrevSlash)
{
state = NormalizeState.PrevDot;
}
else if (state == NormalizeState.PrevDot)
{
state = NormalizeState.PrevDoubleDot;
}
else if (state == NormalizeState.PrevDoubleDot)
{
state = NormalizeState.NothingSpecial;
output.Append("...");
}
else
{
output.Append('.');
}
}
else
{
if (state == NormalizeState.PrevDot)
{
output.Append('.');
}
else if (state == NormalizeState.PrevDoubleDot)
{
output.Append("..");
}
if (!IsValidCharacter(relative[i]))
{
throw new System.IO.IOException("Invalid characters");
}
output.Append(relative[i]);
state = NormalizeState.NothingSpecial;
}
}
return(output.ToString());
}
public static string NormalizeRelativePath(string relative, bool forceTrailingSlash = false)
{
if (string.IsNullOrEmpty(relative))
{
throw new System.ArgumentException("Empty or null", "relative");
}
StringBuilder output = new StringBuilder(relative.Length);
NormalizeState state = NormalizeState.PrevSlash;
output.Append('/');
for (int i = 0; i <= relative.Length; ++i)
{
if (i == relative.Length || relative[i] == Path.DirectorySeparatorChar || relative[i] == Path.AltDirectorySeparatorChar)
{
if (state == NormalizeState.PrevSlash || state == NormalizeState.PrevDot)
{
// do nothing
}
else if (state == NormalizeState.PrevDoubleDot)
{
if (output.Length == 1)
{
throw new System.IO.IOException("AAA");
}
// on level up!
int j;
for (j = output.Length - 2; j >= 0 && output[j] != '/'; --j)
{
}
output.Remove(j + 1, output.Length - j - 1);
}
else if (i < relative.Length || forceTrailingSlash)
{
output.Append('/');
}
state = NormalizeState.PrevSlash;
}
else if (relative[i] == '.')
{
if (state == NormalizeState.PrevSlash)
{
state = NormalizeState.PrevDot;
}
else if (state == NormalizeState.PrevDot)
{
state = NormalizeState.PrevDoubleDot;
}
else if (state == NormalizeState.PrevDoubleDot)
{
state = NormalizeState.NothingSpecial;
output.Append("...");
}
else
{
output.Append('.');
}
}
else
{
if (state == NormalizeState.PrevDot)
{
output.Append('.');
}
else if (state == NormalizeState.PrevDoubleDot)
{
output.Append("..");
}
if (!IsValidCharacter(relative[i]))
{
throw new System.IO.IOException("Invalid characters");
}
output.Append(relative[i]);
state = NormalizeState.NothingSpecial;
}
}
return(output.ToString());
}
