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
________________________________________________________________________

-*/

#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