Combines two paths, removing root-folder combinations. : Path « File Stream « C# / C Sharp






  1. C# / C Sharp
  2. File Stream
  3. Path

Combines two paths, removing root-folder combinations.

      
             

/*
 * Filename:    FileUtil.cs
 * Product:     Versioning Controlled Build
 * Solution:    BuildAutoIncrement
 * Project:     Shared
 * Description: File utility methods.
 * Copyright:   Julijan ?ribar, 2004-2007
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the author(s) be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace BuildAutoIncrement {

    /// <summary>
  /// A set of file utilities.
  /// </summary>
  public struct FileUtil {

        /// <summary>
        ///   Combines two paths, removing root-folder combinations.
        /// </summary>
        /// <param name="rootPath">
        /// </param>
        /// <param name="relativePath">
        /// </param>
        /// <returns></returns>
        public static string CombinePaths(string rootPath, string relativePath) {
            Debug.Assert(Path.IsPathRooted(rootPath));
            Debug.Assert(!Path.IsPathRooted(relativePath));
            string root = Path.GetPathRoot(rootPath);
            // remove any trailing path separators
            if (Path.GetPathRoot(rootPath) != rootPath)
                rootPath = rootPath.Trim(DirectorySeparators);
            int lastSeparator = rootPath.Length;
            string[] relativePathComponents = relativePath.Split(DirectorySeparators);
            int i;
            for (i = 0; i < relativePathComponents.Length; i++) {
                if (relativePathComponents[i].Equals("..")) {
                    lastSeparator = rootPath.LastIndexOfAny(DirectorySeparators, lastSeparator - 1);
                    Debug.Assert(lastSeparator > 0);
                    rootPath = rootPath.Substring(0, lastSeparator + 1);
                }
                else if (!relativePathComponents[i].Equals(".")) {
                    break; 
                }
            }
            Debug.Assert(i < relativePathComponents.Length);
            for (int j = i; j < relativePathComponents.Length; j++) {
                rootPath = Path.Combine(rootPath, relativePathComponents[j]);
            }
            return rootPath;
        }

        /// <summary>
        ///   Directory separator characters.
        /// </summary>
        public static readonly char[] DirectorySeparators = new char[] {Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar };

  }
}








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