fieldExprDriver.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2019-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::expressions::fieldExpr::parseDriver
 
Description
    Driver for generic primitive field expressions
 
    In addition to the standard mathematical functions, operations and
    logical and relational operations, the volume expression support the
    following driver-specific functions:
 
    Functions
    \table
        Function    | Description                      | Number of arguments |
        rand        | Random field                          | 0/1 |
    \endtable
 
Note
    Use namespace debug switch \c fieldExpr for scanner (2), parser (4)
 
SourceFiles
    fieldExprDriver.C
    fieldExprDriverFields.C
    fieldExprDriverTemplates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef expressions_fieldExprDriver_H
#define expressions_fieldExprDriver_H
 
#include "fieldExprFwd.H"
#include "exprDriver.H"
#include "primitiveFields.H"
#include "genericRagelLemonDriver.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace expressions
{
namespace fieldExpr
{
 
/*---------------------------------------------------------------------------*\
                         Class parseDriver Declaration
\*---------------------------------------------------------------------------*/
 
class parseDriver
:
    public parsing::genericRagelLemonDriver,
    public expressions::exprDriver
{
protected:
 
    // Protected Data
 
        //- The field size
        label size_;
 
 
    // Protected Member Functions
 
        // No copy copy construct
        parseDriver(const parseDriver&) = delete;
 
        // No copy assignment
        void operator=(const parseDriver&) = delete;
 
 
public:
 
    ClassName("fieldExpr::driver");
 
    // Constructors
 
        //- Default construct - uses size = 1
        parseDriver();
 
        //- Construct with specified size
        explicit parseDriver(const label len);
 
        //- Construct for specified size with given dictionary
        parseDriver(const label len, const dictionary& dict);
 
        //- Construct for specified size with copy of driver context
        parseDriver(const label len, const parseDriver& rhs);
 
 
    //- Destructor
    virtual ~parseDriver() = default;
 
 
    // Public Member Functions
 
        //- The underlying field size for the expression
        virtual label size() const
        {
            return size_;
        }
 
        //- The underlying point field size for the expression
        virtual label pointSize() const
        {
            return size_;
        }
 
 
    // Evaluation
 
        //- Perform parsing on (sub) string
        using genericRagelLemonDriver::content;
 
        //- Execute the parser
        //  The return value currently has no meaning.
        virtual unsigned parse
        (
            const std::string& expr,
            size_t pos = 0,
            size_t len = std::string::npos
        );
 
 
    // Fields
 
        //- Set result
        template<class Type>
        void setResult(Field<Type>* ptr, bool pointVal = false)
        {
            result().setResult<Type>(ptr, pointVal);
        }
 
 
    // New Fields
 
        //- Return named field (variable) if available
        template<class Type>
        tmp<Field<Type>>
        getField(const word& fieldName) const;
 
 
    // Custom Field Functions
 
        //- A uniform random field
        tmp<scalarField> field_rand(label seed=0, bool gaussian=false) const;
 
        //- A Gaussian random field
        tmp<scalarField> field_randGaussian(label seed=0) const
        {
            return field_rand(seed, true);
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fieldExpr
} // End namespace expressions
} // End namespace Foam
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "fieldExprDriverTemplates.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //