File indexing completed on 2024-04-21 03:58:27

 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2001 S.R. Haque <srhaque@iee.org>.
     SPDX-FileCopyrightText: 2002 David Faure <david@mandrakesoft.com>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #ifndef KREPLACE_H
 #define KREPLACE_H
 
 #include "kfind.h"
 
 #include "ktextwidgets_export.h"
 
 class KReplacePrivate;
 
 /**
  * @class KReplace kreplace.h <KReplace>
  *
  * @brief A generic implementation of the "replace" function.
  *
  * @author S.R.Haque <srhaque@iee.org>, David Faure <faure@kde.org>
  *
  * \b Detail:
  *
  * This class includes prompt handling etc. Also provides some
  * static functions which can be used to create custom behavior
  * instead of using the class directly.
  *
  * \b Example:
  *
  * To use the class to implement a complete replace feature:
  *
  * In the slot connect to the replace action, after using KReplaceDialog:
  * \code
  *
  *  // This creates a replace-on-prompt dialog if needed.
  *  m_replace = new KReplace(pattern, replacement, options, this);
  *
  *  // Connect signals to code which handles highlighting of found text, and
  *  // on-the-fly replacement.
  *  connect(m_replace, &KFind::textFound, this, [this](const QString &text, int matchingIndex, int matchedLength) {
  *      slotHighlight(text, matchingIndex, matchedLength);
  *  });
  *  // Connect findNext signal - called when pressing the button in the dialog
  *  connect( m_replace, SIGNAL( findNext() ),
  *          this, SLOT( slotReplaceNext() ) );
  *  // Connect to the textReplaced() signal - emitted when a replacement is done
  *  connect( m_replace, &KReplace::textReplaced, this, [this](const QString &text, int replacementIndex, int replacedLength, int matchedLength) {
  *      slotReplace(text, replacementIndex, replacedLength, matchedLength);
  *  });
  * \endcode
  *  Then initialize the variables determining the "current position"
  *  (to the cursor, if the option FromCursor is set,
  *   to the beginning of the selection if the option SelectedText is set,
  *   and to the beginning of the document otherwise).
  *  Initialize the "end of search" variables as well (end of doc or end of selection).
  *  Swap begin and end if FindBackwards.
  *  Finally, call slotReplaceNext();
  *
  * \code
  *  void slotReplaceNext()
  *  {
  *      KFind::Result res = KFind::NoMatch;
  *      while ( res == KFind::NoMatch && <position not at end> ) {
  *          if ( m_replace->needData() )
  *              m_replace->setData( <current text fragment> );
  *
  *          // Let KReplace inspect the text fragment, and display a dialog if a match is found
  *          res = m_replace->replace();
  *
  *          if ( res == KFind::NoMatch ) {
  *              <Move to the next text fragment, honoring the FindBackwards setting for the direction>
  *          }
  *      }
  *
  *      if ( res == KFind::NoMatch ) // i.e. at end
  *          <Call either  m_replace->displayFinalDialog(); delete m_replace; m_replace = nullptr;
  *           or           if ( m_replace->shouldRestart() ) { reinit (w/o FromCursor) and call slotReplaceNext(); }
  *                        else { m_replace->closeReplaceNextDialog(); }>
  *  }
  * \endcode
  *
  *  Don't forget delete m_find in the destructor of your class,
  *  unless you gave it a parent widget on construction.
  *
  */
 class KTEXTWIDGETS_EXPORT KReplace : public KFind
 {
     Q_OBJECT
 
 public:
     /**
      * Only use this constructor if you don't use KFindDialog, or if
      * you use it as a modal dialog.
      */
     KReplace(const QString &pattern, const QString &replacement, long options, QWidget *parent = nullptr);
     /**
      * This is the recommended constructor if you also use KReplaceDialog (non-modal).
      * You should pass the pointer to it here, so that when a message box
      * appears it has the right parent. Don't worry about deletion, KReplace
      * will notice if the find dialog is closed.
      */
     KReplace(const QString &pattern, const QString &replacement, long options, QWidget *parent, QWidget *replaceDialog);
 
     ~KReplace() override;
 
     /**
      * Return the number of replacements made (i.e. the number of times
      * the textReplaced() signal was emitted).
      *
      * Can be used in a dialog box to tell the user how many replacements were made.
      * The final dialog does so already, unless you used setDisplayFinalDialog(false).
      */
     int numReplacements() const;
 
     /**
      * Call this to reset the numMatches & numReplacements counts.
      * Can be useful if reusing the same KReplace for different operations,
      * or when restarting from the beginning of the document.
      */
     void resetCounts() override;
 
     /**
      * Walk the text fragment (e.g. kwrite line, kspread cell) looking for matches.
      * For each match, if prompt-on-replace is specified, emits the textFound() signal
      * and displays the prompt-for-replace dialog before doing the replace.
      */
     Result replace();
 
     /**
      * Return (or create) the dialog that shows the "find next?" prompt.
      * Usually you don't need to call this.
      * One case where it can be useful, is when the user selects the "Find"
      * menu item while a find operation is under way. In that case, the
      * program may want to call setActiveWindow() on that dialog.
      */
     QDialog *replaceNextDialog(bool create = false);
 
     /**
      * Close the "replace next?" dialog. The application should do this when
      * the last match was hit. If the application deletes the KReplace, then
      * "find previous" won't be possible anymore.
      */
     void closeReplaceNextDialog();
 
     /**
      * Searches the given @p text for @p pattern; if a match is found it is replaced
      * with @p replacement and the index of the replacement string is returned.
      *
      * @param text The string to search
      * @param pattern The pattern to search for
      * @param replacement The replacement string to insert into the text
      * @param index The starting index into the string
      * @param options The options to use
      * @param replacedLength Output parameter, contains the length of the replaced string
      *        Not always the same as replacement.length(), when backreferences are used
      * @return The index at which a match was found, or -1 otherwise
      */
     static int replace(QString &text, const QString &pattern, const QString &replacement, int index, long options, int *replacedLength);
 
     /**
      * Returns true if we should restart the search from scratch.
      * Can ask the user, or return false (if we already searched/replaced the
      * whole document without the PromptOnReplace option).
      *
      * @param forceAsking set to true if the user modified the document during the
      * search. In that case it makes sense to restart the search again.
      *
      * @param showNumMatches set to true if the dialog should show the number of
      * matches. Set to false if the application provides a "find previous" action,
      * in which case the match count will be erroneous when hitting the end,
      * and we could even be hitting the beginning of the document (so not all
      * matches have even been seen).
      */
     bool shouldRestart(bool forceAsking = false, bool showNumMatches = true) const override;
 
     /**
      * Displays the final dialog telling the user how many replacements were made.
      * Call either this or shouldRestart().
      */
     void displayFinalDialog() const override;
 
 Q_SIGNALS:
     /**
      * Connect to this signal to implement updating of replaced text during the replace
      * operation.
      *
      * Extra care must be taken to properly implement the "no prompt-on-replace" case.
      * For instance, the textFound() signal isn't emitted in that case (some code
      * might rely on it), and for performance reasons one should repaint after
      * replace() ONLY if prompt-on-replace was selected.
      *
      * @param text The text, in which the replacement has already been done
      * @param replacementIndex Starting index of the matched substring
      * @param replacedLength Length of the replacement string
      * @param matchedLength Length of the matched string
      *
      * @since 5.83
      */
     void textReplaced(const QString &text, int replacementIndex, int replacedLength, int matchedLength);
 
 private:
     Q_DECLARE_PRIVATE(KReplace)
 };
 #endif