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 // Created on: 1992-04-06
 // Created by: Christian CAILLET
 // Copyright (c) 1992-1999 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 _IGESData_ParamReader_HeaderFile
 #define _IGESData_ParamReader_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Integer.hxx>
 #include <IGESData_ReadStage.hxx>
 #include <Interface_ParamType.hxx>
 #include <Standard_CString.hxx>
 #include <IGESData_Status.hxx>
 #include <IGESData_ParamCursor.hxx>
 #include <Standard_Type.hxx>
 #include <TColStd_HArray1OfInteger.hxx>
 #include <TColStd_HArray1OfReal.hxx>
 #include <Interface_HArray1OfHAsciiString.hxx>
 #include <IGESData_HArray1OfIGESEntity.hxx>
 
 class Interface_ParamList;
 class Interface_Check;
 class IGESData_IGESEntity;
 class IGESData_IGESReaderData;
 class Message_Msg;
 class gp_XY;
 class gp_XYZ;
 class TCollection_HAsciiString;
 class Interface_EntityList;
 
 
 //! access to a list of parameters, with management of read stage
 //! (owned parameters, properties, associativities) and current
 //! parameter number, read errors (which feed a Check), plus
 //! convenient facilities to read parameters, in particular :
 //! - first parameter is ignored (it repeats entity type), hence
 //! number 1 gives 2nd parameter, etc...
 //! - lists are not explicit, list-reading methods are provided
 //! which manage a current param. number
 //! - interpretation is made as possible (texts, reals, entities ...)
 //! (in particular, Reading a Real accepts an Integer)
 class IGESData_ParamReader 
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   
   //! Prepares a ParamReader, stage "Own", current param = 1
   //! It considers a part of the list, from <base> (excluded) for
   //! <nbpar> parameters; <nbpar> = 0 commands to take list length.
   //! Default is (1 to skip type)
   Standard_EXPORT IGESData_ParamReader(const Handle(Interface_ParamList)& list, const Handle(Interface_Check)& ach, const Standard_Integer base = 1, const Standard_Integer nbpar = 0, const Standard_Integer num = 0);
   
   //! Returns the entity number in the file
   Standard_EXPORT Standard_Integer EntityNumber() const;
   
   //! resets state (stage, current param number, check with no fail)
   Standard_EXPORT void Clear();
   
   //! returns the current parameter number
   //! This notion is involved by the organisation of an IGES list of
   //! parameter : it can be ended by two lists (Associativities and
   //! Properties), which can be empty, or even absent. Hence, it is
   //! necessary to know, at the end of specific reading, how many
   //! parameters have been read : the optional lists follow
   Standard_EXPORT Standard_Integer CurrentNumber() const;
   
   //! sets current parameter number to a new value
   //! must be done at end of each step : set on first parameter
   //! following last read one; is done by some Read... methods
   //! (must be done directly if these method are not used)
   //! num greater than NbParams means that following lists are empty
   //! If current num is not managed, it remains at 1, which probably
   //! will cause error when successive steps of reading are made
   Standard_EXPORT void SetCurrentNumber (const Standard_Integer num);
   
   //! gives current stage (Own-Props-Assocs-End, begins at Own)
   Standard_EXPORT IGESData_ReadStage Stage() const;
   
   //! passes to next stage (must be linked with setting Current)
   Standard_EXPORT void NextStage();
   
   //! passes directly to the end of reading process
   Standard_EXPORT void EndAll();
   
   //! returns number of parameters (minus the first one)
   //! following method skip the first parameter (1 gives the 2nd)
   Standard_EXPORT Standard_Integer NbParams() const;
   
   //! returns type of parameter; note that "Ident" or "Sub" cannot
   //! be encountered, they correspond to "Integer", see also below
   Standard_EXPORT Interface_ParamType ParamType (const Standard_Integer num) const;
   
   //! returns literal value of a parameter, as it was in file
   Standard_EXPORT Standard_CString ParamValue (const Standard_Integer num) const;
   
   //! says if a parameter is defined (not void)
   //! See also DefinedElseSkip
   Standard_EXPORT Standard_Boolean IsParamDefined (const Standard_Integer num) const;
   
   //! says if a parameter can be regarded as an entity reference
   //! (see Prepare from IGESReaderData for more explanation)
   //! Note that such a parameter can seen as be a plain Integer too
   Standard_EXPORT Standard_Boolean IsParamEntity (const Standard_Integer num) const;
   
   //! returns entity number corresponding to a parameter if there is
   //! otherwise zero (according criterium IsParamEntity)
   Standard_EXPORT Standard_Integer ParamNumber (const Standard_Integer num) const;
   
   //! directly returns entity referenced by a parameter
   Standard_EXPORT Handle(IGESData_IGESEntity) ParamEntity (const Handle(IGESData_IGESReaderData)& IR, const Standard_Integer num);
   
   //! Creates a ParamCursor from the Current Number, to read one
   //! parameter, and to advance Current Number after reading
   Standard_EXPORT IGESData_ParamCursor Current() const;
   
   //! Creates a ParamCursor from the Current Number, to read a list
   //! of "nb" items, and to advance Current Number after reading
   //! By default, each item is made of one parameter
   //! If size is given, it precises the number of params per item
   Standard_EXPORT IGESData_ParamCursor CurrentList (const Standard_Integer nb, const Standard_Integer size = 1) const;
   
   //! Allows to simply process a parameter which can be defaulted.
   //! Waits on the Current Number a defined parameter or skips it :
   //! If the parameter <num> is defined, changes nothing and returns True
   //! Hence, the next reading with current cursor will concern <num>
   //! If it is void, advances Current Position by one, and returns False
   //! The next reading will concern <num+1> (except if <num> = NbParams)
   //!
   //! This allows to process Default values as follows (C++) :
   //! if (PR.DefinedElseSkip()) {
   //! .. PR.Read... (current parameter);
   //! } else {
   //! <current parameter> = default value
   //! .. nothing else to do with ParamReader
   //! }
   //! For Message
   Standard_EXPORT Standard_Boolean DefinedElseSkip();
   
   Standard_EXPORT Standard_Boolean ReadInteger (const IGESData_ParamCursor& PC, Standard_Integer& val);
   
   //! Reads an Integer value designated by PC
   //! The method Current designates the current parameter and
   //! advances the Current Number by one after reading
   //! Note that if a count (not 1) is given, it is ignored
   //! If it is not an Integer, fills Check with a Fail (using mess)
   //! and returns False
   Standard_EXPORT Standard_Boolean ReadInteger (const IGESData_ParamCursor& PC, const Standard_CString mess, Standard_Integer& val);
   
   Standard_EXPORT Standard_Boolean ReadBoolean (const IGESData_ParamCursor& PC, const Message_Msg& amsg, Standard_Boolean& val, const Standard_Boolean exact = Standard_True);
   
   //! Reads a Boolean value from parameter "num"
   //! A Boolean is given as an Integer value 0 (False) or 1 (True)
   //! Anyway, an Integer is demanded (else, Check is filled)
   //! If exact is given True, those precise values are demanded
   //! Else, Correction is done, as False for 0 or <0, True for >0
   //! (with a Warning error message, and return is True)
   //! In case of error (not an Integer, or not 0/1 and exact True),
   //! Check is filled with a Fail (using mess) and return is False
   Standard_EXPORT Standard_Boolean ReadBoolean (const IGESData_ParamCursor& PC, const Standard_CString mess, Standard_Boolean& val, const Standard_Boolean exact = Standard_True);
   
   Standard_EXPORT Standard_Boolean ReadReal (const IGESData_ParamCursor& PC, Standard_Real& val);
   
   //! Reads a Real value from parameter "num"
   //! An Integer is accepted (Check is filled with a Warning
   //! message) and causes return to be True (as normal case)
   //! In other cases, Check is filled with a Fail and return is False
   Standard_EXPORT Standard_Boolean ReadReal (const IGESData_ParamCursor& PC, const Standard_CString mess, Standard_Real& val);
   
   Standard_EXPORT Standard_Boolean ReadXY (const IGESData_ParamCursor& PC, Message_Msg& amsg, gp_XY& val);
   
   //! Reads a couple of Real values (X,Y) from parameter "num"
   //! Integers are accepted (Check is filled with a Warning
   //! message) and cause return to be True (as normal case)
   //! In other cases, Check is filled with a Fail and return is False
   Standard_EXPORT Standard_Boolean ReadXY (const IGESData_ParamCursor& PC, const Standard_CString mess, gp_XY& val);
   
   Standard_EXPORT Standard_Boolean ReadXYZ (const IGESData_ParamCursor& PC, Message_Msg& amsg, gp_XYZ& val);
   
   //! Reads a triplet of Real values (X,Y,Z) from parameter "num"
   //! Integers are accepted (Check is filled with a Warning
   //! message) and cause return to be True (as normal case)
   //! In other cases, Check is filled with a Fail and return is False
   //! For Message
   Standard_EXPORT Standard_Boolean ReadXYZ (const IGESData_ParamCursor& PC, const Standard_CString mess, gp_XYZ& val);
   
   Standard_EXPORT Standard_Boolean ReadText (const IGESData_ParamCursor& thePC, const Message_Msg& theMsg, Handle(TCollection_HAsciiString)& theVal);
   
   //! Reads a Text value from parameter "num", as a String from
   //! Collection, that is, Hollerith text without leading "nnnH"
   //! If it is not a String, fills Check with a Fail (using mess)
   //! and returns False
   Standard_EXPORT Standard_Boolean ReadText (const IGESData_ParamCursor& PC, const Standard_CString mess, Handle(TCollection_HAsciiString)& val);
   
   Standard_EXPORT Standard_Boolean ReadEntity (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, IGESData_Status& aStatus, Handle(IGESData_IGESEntity)& val, const Standard_Boolean canbenul = Standard_False);
   
   //! Reads an IGES entity from parameter "num"
   //! An Entity is known by its reference, which has the form of an
   //! odd Integer Value (a number in the Directory)
   //! If <canbenul> is given True, a Reference can also be Null :
   //! in this case, the result is a Null Handle with no Error
   //! If <canbenul> is False, a Null Reference causes an Error
   //! If the parameter cannot refer to an entity (or null), fills
   //! Check with a Fail (using mess) and returns False
   Standard_EXPORT Standard_Boolean ReadEntity (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, const Standard_CString mess, Handle(IGESData_IGESEntity)& val, const Standard_Boolean canbenul = Standard_False);
   
   Standard_EXPORT Standard_Boolean ReadEntity (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, IGESData_Status& aStatus, const Handle(Standard_Type)& type, Handle(IGESData_IGESEntity)& val, const Standard_Boolean canbenul = Standard_False);
   
   //! Safe variant for arbitrary type of argument
   template <class T> 
   Standard_Boolean ReadEntity (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, IGESData_Status& aStatus, const Handle(Standard_Type)& type, Handle(T)& val, const Standard_Boolean canbenul = Standard_False)
   {
     Handle(IGESData_IGESEntity) aVal = val;
     Standard_Boolean aRes = ReadEntity (IR, PC, aStatus, type, aVal, canbenul);
     val = Handle(T)::DownCast(aVal);
     return aRes && (canbenul || ! val.IsNull());
   }
 
   //! Works as ReadEntity without Type, but in addition checks the
   //! Type of the Entity, which must be "kind of" a given <type>
   //! Then, gives the same fail cases as ReadEntity without Type,
   //! plus the case "Incorrect Type"
   //! (in such a case, returns False and givel <val> = Null)
   Standard_EXPORT Standard_Boolean ReadEntity (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, const Standard_CString mess, const Handle(Standard_Type)& type, Handle(IGESData_IGESEntity)& val, const Standard_Boolean canbenul = Standard_False);
   
   //! Safe variant for arbitrary type of argument
   template <class T> 
   Standard_Boolean ReadEntity (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, const Standard_CString mess, const Handle(Standard_Type)& type, Handle(T)& val, const Standard_Boolean canbenul = Standard_False)
   {
     Handle(IGESData_IGESEntity) aVal = val;
     Standard_Boolean aRes = ReadEntity (IR, PC, mess, type, aVal, canbenul);
     val = Handle(T)::DownCast(aVal);
     return aRes && (canbenul || ! val.IsNull());
   }
 
   Standard_EXPORT Standard_Boolean ReadInts (const IGESData_ParamCursor& PC, const Message_Msg& amsg, Handle(TColStd_HArray1OfInteger)& val, const Standard_Integer index = 1);
   
   //! Reads a list of Integer values, defined by PC (with a count of
   //! parameters). PC can start from Current Number and command it
   //! to advance after reading (use method CurrentList to do this)
   //! The list is given as a HArray1, numered from "index"
   //! If all params are not Integer, Check is filled (using mess)
   //! and return value is False
   Standard_EXPORT Standard_Boolean ReadInts (const IGESData_ParamCursor& PC, const Standard_CString mess, Handle(TColStd_HArray1OfInteger)& val, const Standard_Integer index = 1);
   
   Standard_EXPORT Standard_Boolean ReadReals (const IGESData_ParamCursor& PC, Message_Msg& amsg, Handle(TColStd_HArray1OfReal)& val, const Standard_Integer index = 1);
   
   //! Reads a list of Real values defined by PC
   //! Same conditions as for ReadInts, for PC and index
   //! An Integer parameter is accepted, if at least one parameter is
   //! Integer, Check is filled with a "Warning" message
   //! If all params are neither Real nor Integer, Check is filled
   //! (using mess) and return value is False
   Standard_EXPORT Standard_Boolean ReadReals (const IGESData_ParamCursor& PC, const Standard_CString mess, Handle(TColStd_HArray1OfReal)& val, const Standard_Integer index = 1);
   
   Standard_EXPORT Standard_Boolean ReadTexts (const IGESData_ParamCursor& PC, const Message_Msg& amsg, Handle(Interface_HArray1OfHAsciiString)& val, const Standard_Integer index = 1);
   
   //! Reads a list of Hollerith Texts, defined by PC
   //! Texts are read as Hollerith texts without leading "nnnH"
   //! Same conditions as for ReadInts, for PC and index
   //! If all params are not Text, Check is filled (using mess)
   //! and return value is False
   Standard_EXPORT Standard_Boolean ReadTexts (const IGESData_ParamCursor& PC, const Standard_CString mess, Handle(Interface_HArray1OfHAsciiString)& val, const Standard_Integer index = 1);
   
   Standard_EXPORT Standard_Boolean ReadEnts (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, const Message_Msg& amsg, Handle(IGESData_HArray1OfIGESEntity)& val, const Standard_Integer index = 1);
   
   //! Reads a list of Entities defined by PC
   //! Same conditions as for ReadInts, for PC and index
   //! The list is given as a HArray1, numered from "index"
   //! If all params cannot be read as Entities, Check is filled
   //! (using mess) and return value is False
   //! Remark : Null references are accepted, they are ignored
   //! (negative pointers too : they provoke a Warning message)
   //! If the caller wants to check them, a loop on ReadEntity should
   //! be used
   Standard_EXPORT Standard_Boolean ReadEnts (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, const Standard_CString mess, Handle(IGESData_HArray1OfIGESEntity)& val, const Standard_Integer index = 1);
   
   Standard_EXPORT Standard_Boolean ReadEntList (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, Message_Msg& amsg, Interface_EntityList& val, const Standard_Boolean ord = Standard_True);
   
   //! Reads a list of Entities defined by PC
   //! Same conditions as for ReadEnts, for PC
   //! The list is given as an EntityList
   //! (index has no meaning; the EntityList starts from clear)
   //! If "ord" is given True (default), entities will be added to
   //! the list in their original order
   //! Remark : Negative or Null Pointers are ignored
   //! Else ("ord" False), order is not guaranteed (faster mode)
   //! If all params cannot be read as Entities, same as above
   //! Warning  Give "ord" to False ONLY if order is not significant
   Standard_EXPORT Standard_Boolean ReadEntList (const Handle(IGESData_IGESReaderData)& IR, const IGESData_ParamCursor& PC, const Standard_CString mess, Interface_EntityList& val, const Standard_Boolean ord = Standard_True);
   
   Standard_EXPORT Standard_Boolean ReadingReal (const Standard_Integer num, Standard_Real& val);
   
   //! Routine which reads a Real parameter, given its number
   //! Same conditions as ReadReal for mess, val, and return value
   Standard_EXPORT Standard_Boolean ReadingReal (const Standard_Integer num, const Standard_CString mess, Standard_Real& val);
   
   Standard_EXPORT Standard_Boolean ReadingEntityNumber (const Standard_Integer num, Standard_Integer& val);
   
   //! Routine which reads an Entity Number (which allows to read the
   //! Entity in the IGESReaderData by BoundEntity), given its number
   //! in the list of Parameters
   //! Same conditions as ReadEntity for mess, val, and return value
   //! In particular, returns True and val to zero means Null Entity,
   //! and val not zero means Entity read by BoundEntity
   Standard_EXPORT Standard_Boolean ReadingEntityNumber (const Standard_Integer num, const Standard_CString mess, Standard_Integer& val);
   
   Standard_EXPORT void SendFail (const Message_Msg& amsg);
   
   Standard_EXPORT void SendWarning (const Message_Msg& amsg);
   
   Standard_EXPORT void AddFail (const Standard_CString afail, const Standard_CString bfail = "");
   
   //! feeds the Check with a new fail (as a String or as a CString)
   Standard_EXPORT void AddFail (const Handle(TCollection_HAsciiString)& af, const Handle(TCollection_HAsciiString)& bf);
   
   Standard_EXPORT void AddWarning (const Standard_CString awarn, const Standard_CString bwarn = "");
   
   //! feeds the Check with a new Warning message
   Standard_EXPORT void AddWarning (const Handle(TCollection_HAsciiString)& aw, const Handle(TCollection_HAsciiString)& bw);
   
   Standard_EXPORT void Mend (const Standard_CString pref = "");
   
   //! says if fails have been recorded into the Check
   Standard_EXPORT Standard_Boolean HasFailed() const;
   
   //! returns the Check
   //! Note that any error signaled above is also recorded into it
   Standard_EXPORT const Handle(Interface_Check)& Check() const;
   
   //! returns the check in a way which allows to work on it directly
   //! (i.e. messages added to the Check are added to ParamReader too)
   Standard_EXPORT Handle(Interface_Check)& CCheck();
   
   //! Returns True if the Check is Empty
   //! Else, it has to be recorded with the Read Entity
   Standard_EXPORT Standard_Boolean IsCheckEmpty() const;
 
 
 
 
 protected:
 
 
 
 
 
 private:
 
   
   Standard_EXPORT Standard_Boolean PrepareRead (const IGESData_ParamCursor& PC, const Standard_Boolean several, const Standard_Integer size = 1);
   
   //! Prepares work for Read... methods which call it to begin
   //! The required count of parameters must not overpass NbParams.
   //! If several is given False, PC count must be one.
   //! If size is given, the TermSize from ParmCursor must be a
   //! multiple count of this size.
   //! If one of above condition is not satisfied, a Fail Message is
   //! recorded into Check, using the root "mess" and return is False
   Standard_EXPORT Standard_Boolean PrepareRead (const IGESData_ParamCursor& PC, const Standard_CString mess, const Standard_Boolean several, const Standard_Integer size = 1);
   
   //! Gets the first parameter number to be read, determined from
   //! ParamCursor data read by PrepareRead (Start + Offset)
   //! Then commands to skip 1 parameter (default) or nb if given
   Standard_EXPORT Standard_Integer FirstRead (const Standard_Integer nb = 1);
   
   //! Gets the next parameter number to be read. Skips to next Item
   //! if TermSize has been read.
   //! Then commands to skip 1 parameter (default) or nb if given
   Standard_EXPORT Standard_Integer NextRead (const Standard_Integer nb = 1);
   
   //! internal method which builds a Fail message from an
   //! identification "idm" and a diagnostic ("afail")
   //! Also feeds LastReadStatus
   //! <af> for final message, bf (can be different) for original
   Standard_EXPORT void AddFail (const Standard_CString idm, const Handle(TCollection_HAsciiString)& af, const Handle(TCollection_HAsciiString)& bf);
   
   //! Same as above but with CString
   //! <bf> empty means = <af>
   Standard_EXPORT void AddFail (const Standard_CString idm, const Standard_CString afail, const Standard_CString bfail);
   
   //! internal method which builds a Warning message from an
   //! identification "idm" and a diagnostic
   //! <aw> is final message, bw is original (can be different)
   //! Also feeds LastReadStatus
   Standard_EXPORT void AddWarning (const Standard_CString idm, const Handle(TCollection_HAsciiString)& aw, const Handle(TCollection_HAsciiString)& bw);
   
   //! Same as above but with CString
   //! <bw> empty means = <aw>
   Standard_EXPORT void AddWarning (const Standard_CString idm, const Standard_CString aw, const Standard_CString bw);
 
 
   Handle(Interface_ParamList) theparams;
   Handle(Interface_Check) thecheck;
   Standard_Integer thebase;
   Standard_Integer thenbpar;
   Standard_Integer thecurr;
   IGESData_ReadStage thestage;
   Standard_Boolean thelast;
   Standard_Integer theindex;
   Standard_Integer thenbitem;
   Standard_Integer theitemsz;
   Standard_Integer theoffset;
   Standard_Integer thetermsz;
   Standard_Integer themaxind;
   Standard_Integer thenbterm;
   Standard_Integer pbrealint;
   Standard_Integer pbrealform;
   Standard_Integer thenum;
 
 
 };
 
 
 
 
 
 
 
 #endif // _IGESData_ParamReader_HeaderFile

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