interpretexpr.h

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#pragma once
 
/*+
________________________________________________________________________
 
 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        Jaap Glas
 Date:          March 2011
 RCS:           $Id$
________________________________________________________________________
 
-*/
 
#include "uicmddrivermod.h"
#include "bufstring.h"
 
 
namespace CmdDrive
{
 
class CmdDriver;
 
mExpClass(uiCmdDriver) ExprInterpreter
{
public:
                        ExprInterpreter(const CmdDriver&);
 
    const char*         process(const char* exprstr,BufferString& val,
                                bool isargument=false); 
 
    bool                isResultTrivial() const { return trivialresult_; }
    const char*         parsedExpr() const      { return parsedexpr_.buf(); }
    const char*         breakPrefix() const     { return breakprefix_.buf(); }
    bool                isParseError() const;
    const char*         errMsg() const;
 
protected:
    const char*         interpretSingleExpr(const char* parstr,
                                            BufferString& val);
    const char*         interpretCompositeExpr(const char* parstr,
                                               BufferString& val);
    void                setBreakPrefix(const char* endptr,
                                       BufferString& breakprefix) const;
 
    const char*         exprstr_;
    bool                trivialresult_;
    BufferString        parsedexpr_;
    BufferString        breakprefix_;
 
    BufferString        errmsg_;
                        // Start with '~'-symbol to denote parsing error
 
    const CmdDriver&    drv_;
};
 
 
}; // namespace CmdDrive