#region License and Copyright
/* -------------------------------------------------------------------------
* Dotnet Commons IO
*
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the
*
* Free Software Foundation, Inc.,
* 59 Temple Place,
* Suite 330,
* Boston,
* MA 02111-1307
* USA
*
* -------------------------------------------------------------------------
*/
#endregion
using System;
using System.Collections;
using System.Globalization;
using System.IO;
namespace Dotnet.Commons.IO
{
class MainClass
{
/// ---------------------------------------------------------------
/// <summary>
/// Combines two path strings.
/// </summary>
/// <param name="path1">The first path.</param>
/// <param name="path2">The second path.</param>
/// <returns>
/// A string containing the combined paths. If one of the specified
/// paths is a zero-length string, this method returns the other path.
/// If <paramref name="path2" /> contains an absolute path, this method
/// returns <paramref name="path2" />.
/// </returns>
/// <remarks>
/// <para>
/// On Unix, processing is delegated to <see cref="Path.Combine(string, string)" />.
/// </para>
/// <para>
/// On Windows, this method normalized the paths to avoid running into
/// the 260 character limit of a path and converts forward slashes in
/// both <paramref name="path1" /> and <paramref name="path2" /> to
/// the platform's directory separator character.
/// </para>
///
/// Courtesy of NAnt project.
/// </remarks>
/// ---------------------------------------------------------------
public static string CombinePaths(string path1, string path2)
{
if (path1 == null)
{
throw new ArgumentNullException("path1");
}
if (path2 == null)
{
throw new ArgumentNullException("path2");
}
if (Path.IsPathRooted(path2))
{
return path2;
}
char separatorChar = Path.DirectorySeparatorChar;
char[] splitChars = new char[] { '/', separatorChar };
// Now we split the Path by the Path Separator
String[] path2Parts = path2.Split(splitChars);
ArrayList arList = new ArrayList();
// for each Item in the path that differs from ".." we just add it
// to the ArrayList, but skip empty parts
for (int iCount = 0; iCount < path2Parts.Length; iCount++)
{
string currentPart = path2Parts[iCount];
// skip empty parts or single dot parts
if (currentPart.Length == 0 || currentPart == ".")
{
continue;
}
// if we get a ".." Try to remove the last item added (as if
// going up in the Directory Structure)
if (currentPart == "..")
{
if (arList.Count > 0 && ((string)arList[arList.Count - 1] != ".."))
{
arList.RemoveAt(arList.Count - 1);
}
else
{
arList.Add(currentPart);
}
}
else
{
arList.Add(currentPart);
}
}
bool trailingSeparator = (path1.Length > 0 && path1.IndexOfAny(splitChars, path1.Length - 1) != -1);
// if the first path ends in directory seperator character, then
// we need to omit that trailing seperator when we split the path
string[] path1Parts;
if (trailingSeparator)
{
path1Parts = path1.Substring(0, path1.Length - 1).Split(splitChars);
}
else
{
path1Parts = path1.Split(splitChars);
}
int counter = path1Parts.Length;
// if the second path starts with parts to move up the directory tree,
// then remove corresponding parts in the first path
//
// eg. path1 = d:whateveryouwant odo
// path2 = ../../test
//
// ->
//
// path1 = d:whateveryouwant
// path2 = test
ArrayList arList2 = (ArrayList)arList.Clone();
for (int i = 0; i < arList2.Count; i++)
{
// never discard first part of path1
if ((string)arList2[i] != ".." || counter < 2)
{
break;
}
// skip part of current directory
counter--;
arList.RemoveAt(0);
}
string separatorString = separatorChar.ToString(CultureInfo.InvariantCulture);
// if path1 only has one remaining part, and the original path had
// a trailing separator character or the remaining path had multiple
// parts (which were discarded by a relative path in path2), then
// add separator to remaining part
if (counter == 1 && (trailingSeparator || path1Parts.Length > 1))
{
path1Parts[0] += separatorString;
}
string combinedPath = Path.Combine(string.Join(separatorString, path1Parts,
0, counter), string.Join(separatorString, (String[])arList.ToArray(typeof(String))));
// if path2 ends in directory separator character, then make sure
// combined path has trailing directory separator character
if (path2.EndsWith("/") || path2.EndsWith(separatorString))
{
combinedPath += Path.DirectorySeparatorChar;
}
return combinedPath;
}
}
}