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 /*
     SPDX-License-Identifier: GPL-2.0-or-later
     SPDX-FileCopyrightText: 2009 Alexander Rieder <alexanderrieder@gmail.com>
 */
 
 #ifndef _COMPLETIONOBJECT_H
 #define _COMPLETIONOBJECT_H
 
 #include <KCompletion>
 
 #include "cantor_export.h"
 
 namespace Cantor
 {
 class CompletionObjectPrivate;
 class Session;
 
 /**
  * This Object is used to provide a Tab Completion, in an asynchronous way.
  * Each backend, supporting tab completion, needs to provide their own
  * CompletionObject, that reimplements the fetching of the completions
  * and emits done() as soon as the completions are available
  *
  * @author Alexander Rieder
  */
 class CANTOR_EXPORT CompletionObject : public KCompletion
 {
   Q_OBJECT
   public:
     /**
      * Constructor
      * @param parent the session, this object belongs to
      */
     explicit CompletionObject(Session* parent);
     ///Destructor
     ~CompletionObject() override;
 
     enum LineCompletionMode {
     PreliminaryCompletion, ///< Only insert the completion
     FinalCompletion        ///< also add () for functions, etc
     };
 
    /**
      * Returns a list of completions
      * @return a list of completions
      */
     QStringList completions() const;
    /**
      * Returns the last completion
      * @return the last completion
      */
     QString completion() const;
     /**
      * returns the command, this completion is for
      * @return the command, this completion is for
      */
     QString command() const;
     /**
      * returns the session, this object belongs to
      * @return the session, this object belongs to
      */
     Session* session() const;
 
     /**
      * Sets the line and cursor index at which a completion should be found
      * This triggers an asynchronous fetching of completions,
      * which emits done() when done.
      * @param line the line that is to be completed
      * @param index the cursor position in line
      */
     void setLine(const QString& line, int index);
     /**
      * Takes the changed line and updates the command accordingly.
      * This triggers an asynchronous fetching of completions,
      * which emits done() when done.
      * @param line the line that is to be completed
      * @param index the cursor position in line
      */
     void updateLine(const QString& line, int index);
     /**
      * Takes a completion and a completion mode and triggers and calculates
      * the new line with this completion. If the completion mode is
      * FinalCompletion some postprocessing is done asynchronously.
      * Emits lineDone when finished.
      * @param comp the completion that's to be processed
      * @param mode the mode of completion. Can be PreliminaryCompletion
      * (insert only) or FinalCompletion (also add () for functions, etc.)
      */
     void completeLine(const QString& comp, LineCompletionMode mode);
 
   protected:
 
     enum IdentifierType {
     VariableType,   ///< a variable
     FunctionWithArguments,   ///< a function that takes arguments
     FunctionType = FunctionWithArguments, ///< an alias for function with arguments
     FunctionWithoutArguments, ///< a function that takes no arguments
     KeywordType,  ///< a keyword
     UnknownType   ///< no identifier type was found
     };
     /**
      * returns the identifier for fetchIdentifierType
      * @return the identifier for fetchIdentifierType
      */
     QString identifier() const;
 
     /**
      * Sets the completions
      * @param completions list of possible completions
      */
     void setCompletions(const QStringList& completions);
     /**
      * sets the command/command-part
      * @param cmd the command/command-part
      */
     void setCommand(const QString& cmd);
     /**
      * Find an identifier in cmd that ends at index
      * @param cmd the command
      * @param index the index to look at
      */
     virtual int locateIdentifier(const QString& cmd, int index) const;
     /**
      * return true if c may be used in identifier names
      * @param c the character
      */
     virtual bool mayIdentifierContain(QChar c) const;
     /**
      * return true if identifier names can begin with c
      * @param c the character
      */
     virtual bool mayIdentifierBeginWith(QChar c) const;
     /**
      * Completes line with function identifier and emits lineDone with the
      * completed line. Helper function for completeLine.
      * @param type whether the function takes arguments, default: FunctionWithArguments
      */
     void completeFunctionLine(IdentifierType type = FunctionWithArguments);
     /**
      * Completes line with keyword identifier and emits lineDone with the
      * completed line. Helper function for completeLine.
      */
     void completeKeywordLine();
     /**
      * Completes line with variable identifier and emits lineDone with the
      * completed line. Helper function for completeLine.
      */
     void completeVariableLine();
     /**
      * Completes line with identifier of unknown type and emits lineDone with
      * the completed line. Helper function for completeLine.
      */
     void completeUnknownLine();
   protected Q_SLOTS:
     /**
      * This function should be reimplemented to start the actual fetching
      * of the completions. It can be asynchronous.
      * Remember to emit fetchingDone, if the fetching is complete
      */
     virtual void fetchCompletions() = 0;
     /**
      * Fetch the identifier type of d->identifier; reimplemented in
      * the backends. Emit fetchingTypeDone when done.
      */
     virtual void fetchIdentifierType();
     /**
      * Find the completion. To be called when fetching is done.
      * Emits done() when done.
      */
     void findCompletion();
     /**
      * Calls the appropriate complete*Line based on type
      * @param type the identifier type found in line()
      */
     void completeLineWithType(Cantor::CompletionObject::IdentifierType type);
     /**
      * Handle a completion request after a opening parenthesis.
      * @param type the type of the identifier before the parenthesis
      */
     void handleParenCompletionWithType(Cantor::CompletionObject::IdentifierType type);
   Q_SIGNALS:
     /**
      * indicates that the fetching of completions is done
      */
     void fetchingDone();
     /**
      * indicates that the type of identifier() was found and passes the
      * type as an argument
      * @param type the identifier type
      */
     void fetchingTypeDone(Cantor::CompletionObject::IdentifierType type);
     /**
      * indicates that the possible completions and a common completion string
      * have been found
      */
     void done();
     /**
      * emitted when the line completion is done, passes the new line and
      * the cursor index
      * @param line the new line
      * @param index the new cursor index
      */
     void lineDone(const QString &line, int index);
   private:
     CompletionObjectPrivate* d;
 };
 
 }
 
 #endif /* _COMPLETIONOBJECT_H */