kurl.h

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/* This file is part of the KDE libraries
 *  Copyright (C) 1999 Torben Weis <[e-mail]>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA 02111-1307, USA.
 **/

#ifndef __kurl_h__
#define __kurl_h__ "$Id: kurl.h,v 1.76 2001/07/19 07:42:41 hausmann Exp $"

#include <qstring.h>
#include <qvaluelist.h>

class QUrl;
class QStringList;

struct KURLPrivate;

/**
 * Represent and parse a URL.
 *
 * A prototypical URL looks like:
 * <pre>
 *   protocol:/user:password@hostname:port/path/to/file.ext#reference
 * </pre>
 *
 *  @ref KURL has some restrictions regarding the path
 * encoding. @ref KURL works internally with the decoded path and
 * and encoded query. For example,
 * <pre>
 * http://localhost/cgi-bin/test%20me.pl?cmd=Hello%20you
 * </pre>
 * would result in a decoded path "/cgi-bin/test me.pl"
 * and in the encoded query "?cmd=Hello%20you".
 * Since path is internally always encoded you may @em not use
 * "%00" in the path, although this is OK for the query.
 *
 *  @author  Torben Weis <[e-mail]>
 */
class KURL
{
public:
  class List : public QValueList<KURL>
  {
  public:
      List() { }
      List(const QStringList &);
      QStringList toStringList() const;
  };
  /**
   * Construct an empty URL.
   */
  KURL();

  /**
   * destruktor
   */
  ~KURL();

  /**
   * Usual constructor, to construct from a string.
   * @param url A URL, not a filename. If the URL does not have a protocol
   *             part, "file:" is assumed.
   *             It is dangerous to feed unix filenames into this function,
   *             this will work most of the time but not always.
   *             For example "/home/Torben%20Weis" will be considered a URL
   *             pointing to the file "/home/Torben Weis" instead of to the
   *             file "/home/Torben%20Weis".
   *             This means that if you have a usual UNIX like path you
   *             should not use this constructor.
   *             Instead create an empty url and set the path by using
   *             @ref setPath().
   * @param encoding_hint Reserved, should be 0.
   */
  KURL( const QString& url, int encoding_hint = 0 );
  /**
   * Constructor taking a char * @p url, which is an _encoded_ representation
   * of the URL, exactly like the usual constructor. This is useful when
   * then URL, in its encoded form, is strictly ascii.
   */
  KURL( const char * url, int encoding_hint = 0 );
  /**
   * Copy constructor
   */
  KURL( const KURL& u );
  /**
   * Convert from a @ref QUrl.
   */
  KURL( const QUrl &u );
  /**
   * Constructor allowing relative URLs.
   *
   * @param _baseurl The base url.
   * @param _rel_url A relative or absolute URL.
   * If this is an absolute URL then @p _baseurl will be ignored.
   * If this is a relative URL it will be combined with @p _baseurl.
   * Note that _rel_url should be encoded too, in any case.
   * So do NOT pass a path here (use setPath or addPath instead).
   * @param encoding_hint Reserved, should be 0.
   */
  KURL( const KURL& _baseurl, const QString& _rel_url, int encoding_hint=0 );

  /**
   * Retrieve the protocol for the URL (i.e., file, http, etc.).
   **/
  QString protocol() const { return m_bIsMalformed ? QString::null : m_strProtocol; }
  /**
   * Set the protocol for the URL (i.e., file, http, etc.)
   **/
  void setProtocol( const QString& _txt );

  /**
   * Retrieve the decoded user name (login, user id, ...) included in the URL.
   **/
  QString user() const { return m_strUser; }
  /**
   * Set the user name (login, user id, ...) included the URL.
   *
   * Special characters in the user name will appear encoded in the URL.
   **/
  void setUser( const QString& _txt );
  /**
   * Test to see if this URL has a user name included in it.
   **/
  bool hasUser() const { return !m_strUser.isEmpty(); }

  /**
   * Retrieve the decoded password (corresponding to @ref user()) included in the URL.
   **/
  QString pass() const { return m_strPass; }
  /**
   * Set the password (corresponding to @ref user()) included in the URL.
   *
   * Special characters in the password will appear encoded in the URL.
   **/
  void setPass( const QString& _txt );
  /**
   * Test to see if this URL has a password included in it.
   **/
  bool hasPass() const { return !m_strPass.isEmpty(); }

  /**
   * Retrieve the decoded hostname included in the URL.
   **/
  QString host() const { return m_strHost; }
  /**
   * Set the hostname included in the URL.
   *
   * Special characters in the hostname will appear encoded in the URL.
   **/
  void setHost( const QString& _txt );
  /**
   * Test to see if this URL has a hostname included in it.
   **/
  bool hasHost() const { return !m_strHost.isEmpty(); }

  /**
   * Retrieve the port number included in the URL.
   * If there is no port number specified in the URL, returns 0.
   **/
  unsigned short int port() const { return m_iPort; }
  /**
   * Set the port number included in the URL.
   **/
  void setPort( unsigned short int _p );

  /**
   * @return The current decoded path. This does @em not include the query.
   *
   */
  QString path() const  { return m_strPath; }

  /**
   * @param _trailing May be ( -1, 0 +1 ). -1 strips a trailing '/', +1 adds
   *                  a trailing '/' if there is none yet and 0 returns the
   *                  path unchanged. If the URL has no path, then no '/' is added
   *                  anyway. And on the other side: If the path is "/", then this
   *                  character won't be stripped. Reason: "ftp://weis@host" means something
   *                  completely different than "ftp://weis@host/". So adding or stripping
   *                  the '/' would really alter the URL, while "ftp://host/path" and
   *                  "ftp://host/path/" mean the same directory.
   *
   * @return The current decoded path. This does not include the query.
   */
  QString path( int _trailing ) const;

  /**
   * path This is considered to be decoded. This means: %3f does not become decoded
   *      and the ? does not indicate the start of the query part.
   *      The query is not changed by this function.
   */
  void setPath( const QString& path );
  /**
   * Test to see if this URL has a path is included in it.
   **/
  bool hasPath() const { return !m_strPath.isEmpty(); }

  /** Removes all multiple directory separators ('/') and
   * resolves any "." or ".." found in the path.
   * Calls @ref QDir::cleanDirPath but saves the trailing slash if any.
   */
  void cleanPath();
   
  /**
   * Same as above except it takes a flag that allows you
   * to ignore the clean up of the multiple directory separators.
   * 
   * Some servers seem not to like the removal of extra '/' 
   * eventhough it is against the specification in RFC 2396.
   */   
  void cleanPath(bool cleanDirSeparator);

  /**
   * This is useful for HTTP. It looks first for '?' and decodes then.
   * The encoded path is the concatenation of the current path and the query.
   * @param encoding_hint Reserved, should be 0.
   */
  void setEncodedPathAndQuery( const QString& _txt, int encoding_hint = 0 );

  /**
   * @return The concatenation if the encoded path , '?' and the encoded query.
   *
   * @param _no_empty_path If set to true then an empty path is substituted by "/".
   * @param encoding_hint Reserved, should be 0.
   */
  QString encodedPathAndQuery( int _trailing = 0, bool _no_empty_path = false, int encoding_hint = 0) const;

  /**
   * @param _txt This is considered to be encoded. This has a good reason:
   * The query may contain the 0 character.
   *
   * The query should start with a '?'. If it doesn't '?' is prepended.
   * @param encoding_hint Reserved, should be 0.
   */
  void setQuery( const QString& _txt, int encoding_hint = 0);

  /**
   * @return The encoded query.
   * This has a good reason: The query may contain the 0 character.
   * If a query is present it always starts with a '?'.
   * A single '?' means an empty query.
   * An empty string means no query.
   */
  QString query() const { return m_strQuery_encoded; }

  /**
   * The reference is @em never decoded automatically.
   */
  QString ref() const { return m_strRef_encoded; }

  /**
   * Set the reference part (everything after '#').
   * @param _txt is considered encoded.
   */
  void setRef( const QString& _txt ) { m_strRef_encoded = _txt; }

  /**
   * @return @p true if the reference part of the URL is not empty. In a URL like
   *         http://www.kde.org/kdebase.tar#tar:/README it would return @p true, too.
   */
  bool hasRef() const { return !m_strRef_encoded.isEmpty(); }

  /**
   * @return The HTML-style reference.
   */
  QString htmlRef() const;

  /**
   * @return The HTML-style reference in its original form.
   */
  QString encodedHtmlRef() const;

  /**
   * Set the HTML-style reference.
   *
   * @param _ref This is considered to be @em not encoded in contrast to @ref setRef()