Get relative path (2)
namespace RSBuild
{
using System.Text;
/// <summary>
/// Utility methods.
/// </summary>
public static class PathUtil
{
/// <summary>
/// Formats the path.
/// </summary>
/// <param name="input">The input.</param>
/// <returns></returns>
public static string FormatPath(string input)
{
const char DIR_SEPARATOR = '/';
input = input == null
? string.Empty
: input.Trim();
if (input.Length == 0) return DIR_SEPARATOR.ToString();
StringBuilder sb = new StringBuilder(input).Replace('\\', DIR_SEPARATOR);
if (sb[sb.Length - 1] == DIR_SEPARATOR)
{
sb.Length -= 1;
}
if (sb[0] != DIR_SEPARATOR)
{
sb.Insert(0, DIR_SEPARATOR);
}
return sb.ToString();
}
/// <summary>
/// Gets the relative path.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="target">The target.</param>
/// <returns></returns>
public static string GetRelativePath(string source, string target)
{
string pathSource = PathUtil.FormatPath(source);
string pathTarget = PathUtil.FormatPath(target);
string[] sourceSegments = null;
string[] targetSegments = null;
int sourceToCommonRoot = 0;
int targetToCommonRoot = 0;
if (pathSource != "/")
{
sourceSegments = pathSource.Split('/');
sourceToCommonRoot = sourceSegments.GetUpperBound(0);
}
if (pathTarget != "/")
{
targetSegments = pathTarget.Split('/');
targetToCommonRoot = targetSegments.GetUpperBound(0);
}
StringBuilder relativePath = new StringBuilder();
int parentSegments = sourceToCommonRoot;
int i = 1;
while(sourceToCommonRoot >= i && targetToCommonRoot >= i)
{
if (string.Compare(sourceSegments[i], targetSegments[i], true) == 0)
{
parentSegments--;
i++;
}
else
{
break;
}
}
for(int k=0; k<parentSegments; k++)
{
relativePath.Append("../");
}
for(int m=i; m<=targetToCommonRoot; m++)
{
relativePath.AppendFormat("{0}/", targetSegments[m]);
}
return relativePath.ToString();
}
}
}