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 // Created on: 1993-07-27
 // Created by: Christian CAILLET
 // Copyright (c) 1993-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _IFSelect_SessionPilot_HeaderFile
 #define _IFSelect_SessionPilot_HeaderFile
 
 #include <Standard.hxx>
 
 #include <Standard_Integer.hxx>
 #include <TColStd_Array1OfAsciiString.hxx>
 #include <TColStd_Array1OfInteger.hxx>
 #include <IFSelect_Activator.hxx>
 #include <IFSelect_ReturnStatus.hxx>
 #include <IFSelect_PrintCount.hxx>
 class IFSelect_WorkSession;
 class IFSelect_WorkLibrary;
 class IFSelect_SignCounter;
 
 class IFSelect_SessionPilot;
 DEFINE_STANDARD_HANDLE(IFSelect_SessionPilot, IFSelect_Activator)
 
 //! A SessionPilot is intended to make easier the use of a WorkSession.
 //! It receives commands, under alphanumeric form,
 //! then calls a library of Activators to interpret and run them.
 //!
 //! Then, WorkSession just records data required to work :
 //! Rules for Selection, Dispatch ... ; File Data (InterfaceModel
 //! and results of Evaluations and Transfer as required).
 //! SessionPilot records and works with alphanumeric commands and
 //! their results (under a very simple form). It calls a list of
 //! Activators to perform the actions.
 //!
 //! A Command can have several forms :
 //! - classic execution, to list, evaluate, or enrich the session
 //! - command which creates a new item (a Selection for instance)
 //! such a command should not add it to the session, but make it
 //! recorded by the Pilot (method RecordItem). The Pilot will
 //! add the item in the session, with no name
 //! -> such a command may be called :
 //! - directly, it will add an item with no name
 //! - by command xset, in the following form :
 //! xset name command ...  calls the command and adds the item
 //! to the session under the specified name (if not yet known)
 //!
 //! Thus, to a specific Norm or way of working, only Activators
 //! change. A specific Initialisation can be done by starting
 //! with a specific set of commands.
 //!
 //! In addition, SessionPilot is a sub-type of Activator, to
 //! recognize some built-in commands : exit/x, help/?, control of
 //! command line, and commands xstep xset ... See method Do
 //!
 //! At least, empty lines and comment lines (beginning by '#')
 //! are skipped (comment lines are display if read from file)
 class IFSelect_SessionPilot : public IFSelect_Activator
 {
 
 public:
 
   //! Creates an empty SessionPilot, with a prompt which will be
   //! displayed on querying commands. If not precised (""), this
   //! prompt is set to "Test-XSTEP>"
   Standard_EXPORT IFSelect_SessionPilot(const Standard_CString prompt = "");
   
   //! Returns the WorkSession which is worked on
   Standard_EXPORT Handle(IFSelect_WorkSession) Session() const;
   
   //! Returns the WorKlibrary (Null if not set). WorkLibrary is used
   //! to Read and Write Files, according to the Norm
   Standard_EXPORT Handle(IFSelect_WorkLibrary) Library() const;
   
   //! Returns the Record Mode for Commands. Default is False.
   Standard_EXPORT Standard_Boolean RecordMode() const;
   
   //! Sets a WorkSession to be worked on
   Standard_EXPORT void SetSession (const Handle(IFSelect_WorkSession)& WS);
   
   //! Sets a WorkLibrary
   Standard_EXPORT void SetLibrary (const Handle(IFSelect_WorkLibrary)& WL);
   
   //! Changes the RecordMode.
   Standard_EXPORT void SetRecordMode (const Standard_Boolean mode);
   
   //! Sets the value of the Command Line to be interpreted
   //! Also prepares the interpretation (splitting by blanks)
   Standard_EXPORT void SetCommandLine (const TCollection_AsciiString& command);
   
   //! Returns the Command Line to be interpreted
   Standard_EXPORT const TCollection_AsciiString& CommandLine() const;
   
   //! Returns the part of the command line which begins at argument
   //! <numarg> between 0 and NbWords-1 (by default, all the line)
   //! Empty string if out of range
   Standard_EXPORT Standard_CString CommandPart (const Standard_Integer numarg = 0) const;
   
   //! Returns the count of words of the Command Line, separated by
   //! blanks : 0 if empty, one if a command without args, else it
   //! gives the count of args minus one.
   //! Warning : limited to 10 (command title + 9 args)
   Standard_EXPORT Standard_Integer NbWords() const;
   
   //! Returns a word given its rank in the Command Line. Begins at 0
   //! which is the Command Title, 1 is the 1st arg., etc...
   Standard_EXPORT const TCollection_AsciiString& Word (const Standard_Integer num) const;
   
   //! Returns a word given its rank, as a CString.
   //! As for Word, begins at 0 (the command name), etc...
   Standard_EXPORT Standard_CString Arg (const Standard_Integer num) const;
   
   //! Removes a word given its rank. Returns True if Done, False if
   //! <num> is out of range
   Standard_EXPORT Standard_Boolean RemoveWord (const Standard_Integer num);
   
   //! Returns the count of recorded Commands
   Standard_EXPORT Standard_Integer NbCommands() const;
   
   //! Returns a recorded Command, given its rank (from 1)
   Standard_EXPORT const TCollection_AsciiString& Command (const Standard_Integer num) const;
   
   //! Allows to associate a Transient Value with the last execution
   //! as a partial result
   //! Returns RetDone if item is not Null, RetFail if item is Null
   //! Remark : it is nullified for each Perform
   Standard_EXPORT IFSelect_ReturnStatus RecordItem (const Handle(Standard_Transient)& item);
   
   //! Returns the Transient Object which was recorded with the
   //! current Line Command. If none was, returns a Null Handle
   Standard_EXPORT Handle(Standard_Transient) RecordedItem() const;
   
   //! Clears the recorded information (commands, objects)
   Standard_EXPORT void Clear();
   
   //! Reads commands from a Script File, named <file>. By default
   //! (file = ""), reads from standard input with a prompt
   //! Else (reading from a file), the read commands are displayed
   //! onto standard output. Allows nested reads. Reading is stopped
   //! either by command x or exit, or by reaching end of file
   //! Return Value follows the rules of Do : RetEnd for normal end,
   //! RetFail if script could not be opened
   Standard_EXPORT IFSelect_ReturnStatus ReadScript (const Standard_CString file = "");
   
   //! Executes the Command, itself (for built-in commands, which
   //! have priority) or by using the list of Activators.
   //! The value returned is : RetVoid if nothing done (void command)
   //! RetDone if execution OK, RetEnd if END OF SESSION, RetError if
   //! command unknown or incorrect, RetFail if error on execution
   //! If execution is OK and RecordMode is set, this Command Line is
   //! recorded to the list (see below).
   Standard_EXPORT IFSelect_ReturnStatus Perform();
   
   //! Executes the Commands, except that the command name (word 0)
   //! is aliased. The rest of the command line is unchanged
   //! If <alias> is empty, Executes with no change
   //!
   //! Error status is returned if the alias is unknown as command
   Standard_EXPORT IFSelect_ReturnStatus ExecuteAlias (const TCollection_AsciiString& aliasname);
   
   //! Sets the Command then tries to execute it. Return value :
   //! same as for Perform
   Standard_EXPORT IFSelect_ReturnStatus Execute (const TCollection_AsciiString& command);
   
   //! Executes a Counter in a general way
   //! If <numword> is greater than count of command words, it counts
   //! all the model. Else it considers the word <numword> as the
   //! identifier of a Selection
   //! <mode> gives the mode of printing results, default is
   //! CountByItem
   Standard_EXPORT IFSelect_ReturnStatus ExecuteCounter (const Handle(IFSelect_SignCounter)& counter, const Standard_Integer numword, const IFSelect_PrintCount mode = IFSelect_CountByItem);
   
   //! Interprets a string value as an entity number :
   //! if it gives an integer, returns its value
   //! else, considers it as ENtityLabel (preferably case sensitive)
   //! in case of failure, returns 0
   Standard_EXPORT Standard_Integer Number (const Standard_CString val) const;
   
   //! Processes specific commands, which are :
   //! x or exit for end of session
   //! ? or help for help messages
   //! xcommand to control command lines (Record Mode, List, Clear,
   //! File Output ...)
   //! xsource to execute a command file (no nesting allowed),
   //! in case of error, source is stopped and keyword recovers
   //! xstep is a simple prefix (useful in a wider environment, to
   //! avoid conflicts on command names)
   //! xset control commands which create items with names
   Standard_EXPORT IFSelect_ReturnStatus Do (const Standard_Integer number, const Handle(IFSelect_SessionPilot)& session) Standard_OVERRIDE;
   
   //! Help for specific commands (apart from general command help)
   Standard_EXPORT Standard_CString Help (const Standard_Integer number) const Standard_OVERRIDE;
 
   DEFINE_STANDARD_RTTIEXT(IFSelect_SessionPilot,IFSelect_Activator)
 
 private:
 
   Handle(IFSelect_WorkSession) thesession;
   TCollection_AsciiString theprompt;
   TCollection_AsciiString thecommand;
   Standard_Integer thenbwords;
   TColStd_Array1OfAsciiString thewords;
   TColStd_Array1OfInteger thewordeb;
   Standard_Boolean therecord;
   Standard_Integer thenumrec;
   Handle(Standard_Transient) theobjrec;
   TColStd_SequenceOfAsciiString thecomlist;
 
 };
 
 #endif // _IFSelect_SessionPilot_HeaderFile

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