Horizon – Rev 1
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using System;
using System.IO;
namespace Horizon.Utilities
{
/// <summary>
/// Various extensions for dealing with subpaths.
/// </summary>
/// <remarks>https://stackoverflow.com/questions/5617320/given-full-path-check-if-path-is-subdirectory-of-some-other-path-or-otherwise</remarks>
public static class Subpaths
{
#region Public Methods
public static string NormalizePath(this string path)
{
return Path.GetFullPath(path.Replace('/', '\\').WithEnding("\\"));
}
/// <summary>
/// Returns true if <paramref name="path" /> starts with the path <paramref name="baseDirPath" />.
/// The comparison is case-insensitive, handles / and \ slashes as folder separators and
/// only matches if the base dir folder name is matched exactly ("c:\foobar\file.txt" is not a sub path of "c:\foo").
/// </summary>
public static bool IsSubPathOf(this string path, string baseDirPath)
{
var normalizedPath = NormalizePath(path);
var normalizedBaseDirPath = NormalizePath(baseDirPath);
return normalizedPath.StartsWith(normalizedBaseDirPath, StringComparison.OrdinalIgnoreCase);
}
public static bool IsPathEqual(this string path, string that)
{
return string.Equals(NormalizePath(path), NormalizePath(that), StringComparison.OrdinalIgnoreCase);
}
#endregion
#region Private Methods
/// <summary>
/// Returns <paramref name="str" /> with the minimal concatenation of <paramref name="ending" /> (starting from end)
/// that
/// results in satisfying .EndsWith(ending).
/// </summary>
/// <example>"hel".WithEnding("llo") returns "hello", which is the result of "hel" + "lo".</example>
private static string WithEnding(this string str, string ending)
{
if (str == null)
{
return ending;
}
var result = str;
// Right() is 1-indexed, so include these cases
// * Append no characters
// * Append up to N characters, where N is ending length
for (var i = 0; i <= ending.Length; i++)
{
var tmp = result + ending.Right(i);
if (tmp.EndsWith(ending))
{
return tmp;
}
}
return result;
}
/// <summary>Gets the rightmost <paramref name="length" /> characters from a string.</summary>
/// <param name="value">The string to retrieve the substring from.</param>
/// <param name="length">The number of characters to retrieve.</param>
/// <returns>The substring.</returns>
private static string Right(this string value, int length)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (length < 0)
{
throw new ArgumentOutOfRangeException("length", length, "Length is less than zero");
}
return length < value.Length ? value.Substring(value.Length - length) : value;
}
#endregion
}
}
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