#if BETA2
/********************************************************************************************

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This license governs use of the accompanying software. If you use the software, you 
accept this license. If you do not accept the license, do not use the software. 

1. Definitions 
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same meaning here as under U.S. copyright law. 
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A "contributor" is any person that distributes its contribution under this license. 
"Licensed patents" are a contributor's patent claims that read directly on its contribution. 

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(A) Copyright Grant- Subject to the terms of this license, including the license conditions 
and limitations in section 3, each contributor grants you a non-exclusive, worldwide, 
royalty-free copyright license to reproduce its contribution, prepare derivative works of 
its contribution, and distribute its contribution or any derivative works that you create. 
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royalty-free license under its licensed patents to make, have made, use, sell, offer for 
sale, import, and/or otherwise dispose of its contribution in the software or derivative 
works of the contribution in the software. 

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(A) No Trademark License- This license does not grant you rights to use any contributors' 
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(B) If you bring a patent claim against any contributor over patents that you claim are 
infringed by the software, your patent license from such contributor to the software ends 
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under this license by including a complete copy of this license with your distribution. 
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do so under a license that complies with this license. 
(E) The software is licensed "as-is." You bear the risk of using it. The contributors give 
no express warranties, guarantees or conditions. You may have additional consumer rights 
under your local laws which this license cannot change. To the extent permitted under your 
local laws, the contributors exclude the implied warranties of merchantability, fitness for 
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********************************************************************************************/

using System;
using System.Windows.Forms;
using System.Diagnostics;
using Microsoft.Win32;
using System.Globalization;
using System.IO;
using System.Collections;
using System.Xml;
using System.Text;
using System.Net;
using IOleServiceProvider = Microsoft.VisualStudio.OLE.Interop.IServiceProvider;
using IServiceProvider = System.IServiceProvider;
using ShellConstants = Microsoft.VisualStudio.Shell.Interop.Constants;
using OleConstants = Microsoft.VisualStudio.OLE.Interop.Constants;

namespace Microsoft.VisualStudio.Package
{	
    /// <summary>
    /// This class wraps the Uri class and provides an unescaped "LocalPath" for file URL's
    /// and an unescaped AbsoluteUri for other schemes, plus it also returned an un-hex-escaped
    /// result from MakeRelative so it can be presented to the user.
    /// </summary>
    public class Url
    {
        private Uri uri = null;
        private bool isFile;

        
        public Url(string path)
        {
            Init(path);
        }
        
        void Init(string path)
        {
            // Must try absolute first, then fall back on relative, otherwise it
            // makes some absolute UNC paths like (\\lingw11\Web_test\) relative!
            if (path != null)
            {

                if (!Uri.TryCreate(path, UriKind.Absolute, out this.uri))
                {
                    Uri.TryCreate(path, UriKind.Relative, out this.uri);
                } 
                
                this.CheckIsFile();
            }
        }

        void CheckIsFile()
        {
            this.isFile = false;
            if (this.uri != null)
            {
                if (this.uri.IsAbsoluteUri)
                {
                    this.isFile = this.uri.IsFile;
                }
                else
                {
                    string[] test1 = this.uri.OriginalString.Split('/');
                    string[] test2 = this.uri.OriginalString.Split('\\');
                    if (test1.Length < test2.Length)
                    {
                        this.isFile = true;
                    }
                }
            }
        }

        // allows relpath to be null, in which case it just returns the baseUrl.
        
        public Url(Url baseUrl, string relpath)
        {
            if (baseUrl.uri == null)
            {
                Init(relpath);
            }
            else if (string.IsNullOrEmpty(relpath))
            {
                this.uri = baseUrl.uri;
            }
            else
            {
                this.uri = new Uri(baseUrl.uri, relpath);
            }
            CheckIsFile();
        }
        
        
        public string AbsoluteUrl
        {
            get
            {
                if (this.uri == null) return null;
                if (this.uri.IsAbsoluteUri)
                {
                    if (this.isFile)
                    {
                        // Fix for build break. UriComponents.LocalPath is no longer available.
                        // return uri.GetComponents(UriComponents.LocalPath, UriFormat.SafeUnescaped);
                        return uri.LocalPath;
                    }
                    else
                    {
                        return uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped);
                    }
                }
                else
                {
                    return uri.OriginalString;
                }
            }
        }

        
        /// <summary>Returns the AbsoluteUrl for the parent directory containing the file 
        /// referenced by this URL object, where the Directory string is also unescaped.</summary>
        public string Directory
        {
            get
            {
                string path = this.AbsoluteUrl;
                if (path == null) return null;
                int i = path.LastIndexOf(this.IsFile ? Path.DirectorySeparatorChar : '/');
                int len = (i > 0) ? i : path.Length;
                return path.Substring(0, len);
            }
        }

        
        public bool IsFile
        {
            get { return this.isFile; }
        }

        
        public Url Move(Url oldBase, Url newBase)
        {
            if (this.uri == null || oldBase.uri == null) return null;
            string rel = oldBase.uri.MakeRelativeUri(this.uri).ToString();
            return new Url(newBase, rel);
        }

        // return an un-escaped relative path
        
        public string MakeRelative(Url url)
        {
            if (this.uri == null || url.uri == null) return null;
            if (this.uri.Scheme != url.uri.Scheme || this.uri.Host != url.uri.Host)
            {
                // Then it cannot be relatavized (e.g from file:// to http://).
                return url.AbsoluteUrl;
            }
            // This will return a hex-escaped string.
            string rel = this.uri.MakeRelativeUri(url.uri).ToString();

            // So unescape it.
            return Unescape(rel, this.isFile);
        }

        const char c_DummyChar = (char)0xFFFF;

        private static char EscapedAscii(char digit, char next)
        {
            // Only accept hexadecimal characters
            if (!(((digit >= '0') && (digit <= '9'))
                || ((digit >= 'A') && (digit <= 'F'))
                || ((digit >= 'a') && (digit <= 'f'))))
            {
                return c_DummyChar;
            }

            int res = 0;
            if (digit <= '9')
                res = (int)digit - (int)'0';
            else if (digit <= 'F')
                res = ((int)digit - (int)'A') + 10;
            else
                res = ((int)digit - (int)'a') + 10;

            // Only accept hexadecimal characters
            if (!(((next >= '0') && (next <= '9'))
                || ((next >= 'A') && (next <= 'F'))
               || ((next >= 'a') && (next <= 'f'))))
            {
                return c_DummyChar;
            }

            res = res << 4;
            if (next <= '9')
                res += (int)next - (int)'0';
            else if (digit <= 'F')
                res += ((int)next - (int)'A') + 10;
            else
                res += ((int)next - (int)'a') + 10;

            return (char)(res);
        }

        
        public static string Unescape(string escaped, bool isFile)
        {
            if (String.IsNullOrEmpty(escaped))
            {
                return String.Empty;
            }

            byte[] bytes = null;
            char[] dest = new char[escaped.Length];
            int j = 0;

            for (int i = 0, end = escaped.Length; i < end; i++)
            {
                char ch = escaped[i];
                if (ch != '%')
                {
                    if (ch == '/' && isFile)
                    {
                        ch = Path.DirectorySeparatorChar;
                    }
                    dest[j++] = ch;
                }
                else
                {
                    int byteCount = 0;
                    // lazy initialization of max size, will reuse the array for next sequences
                    if (bytes == null)
                    {
                        bytes = new byte[end - i];
                    }

                    do
                    {
                        // Check on exit criterion
                        if ((ch = escaped[i]) != '%' || (end - i) < 3)
                        {
                            break;
                        }
                        // already made sure we have 3 characters in str
                        ch = EscapedAscii(escaped[i + 1], escaped[i + 2]);
                        if (ch == c_DummyChar)
                        {
                            //invalid hex sequence, we will out '%' character
                            ch = '%';
                            break;
                        }
                        else if (ch < '\x80')
                        {
                            // character is not part of a UTF-8 sequence
                            i += 2;
                            break;
                        }
                        else
                        {
                            //a UTF-8 sequence
                            bytes[byteCount++] = (byte)ch;
                            i += 3;
                        }
                    } while (i < end);

                    if (byteCount != 0)
                    {

                        int charCount = Encoding.UTF8.GetCharCount(bytes, 0, byteCount);
                        if (charCount != 0)
                        {
                            Encoding.UTF8.GetChars(bytes, 0, byteCount, dest, j);
                            j += charCount;
                        }
                        else
                        {
                            // the encoded, high-ANSI characters are not UTF-8 encoded
                            for (int k = 0; k < byteCount; ++k)
                            {
                                dest[j++] = (char)bytes[k];
                            }
                        }
                    }
                    if (i < end)
                    {
                        dest[j++] = ch;
                    }
                }
            }
            return new string(dest, 0, j);
        }

        
        public Uri Uri
        {
            get { return this.uri; }
        }

        // <include file='doc\Utilities.uex' path='docs/doc[@for="Url.Segments"]/*' />
        // Unlike the Uri class, this ALWAYS succeeds, even on relative paths, and it
        // strips out the path separator characters
        
        public string[] GetSegments()
        {		
            if (this.uri == null) return null;
            string path = this.AbsoluteUrl;
            if (this.isFile || !this.uri.IsAbsoluteUri)
            {
                if (path.EndsWith("\\"))
                    path = path.Substring(0, path.Length - 1);
                return path.Split(Path.DirectorySeparatorChar);
            }
            else
            {
                // strip off "http://" and host name, since those are not part of the path.
                path = path.Substring(this.uri.Scheme.Length + 3 + this.uri.Host.Length + 1);
                if (path.EndsWith("/"))
                    path = path.Substring(0, path.Length - 1);
                return path.Split('/');
            }	
        }

        
        /// Return unescaped path up to (but not including) segment i.
        public string GetPartial(int i)
        {
            string path = JoinSegments(0, i);
            if (!this.isFile)
            {
                // prepend "http://host/"
                path = this.uri.Scheme + "://" + this.uri.Host + '/' + path;
            }
            return path;
        }

        
        /// Return unescaped relative path starting segment i.
        public string GetRemainder(int i)
        {
            return JoinSegments(i, -1);
        }

        
        public string JoinSegments(int i, int j)
        {
            if (i < 0)
                throw new ArgumentOutOfRangeException("i");

            StringBuilder sb = new StringBuilder();
            string[] segments = this.GetSegments();
            if (segments == null)
                return null;
            if (j < 0)
                j = segments.Length;
            int len = segments.Length;
            for (; i < j && i < len; i++)
            {
                if (sb.Length > 0)
                    sb.Append(this.isFile ? Path.DirectorySeparatorChar : '/');
                string s = segments[i];
                sb.Append(s);
            }
            return Unescape(sb.ToString(), isFile);
        }
    }
}
#endif