fieldExprParser.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2019-2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
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Class
    Foam::expressions::fieldExpr::parser

Description
    Lemon parser interface for field expressions grammar

\*---------------------------------------------------------------------------*/

#ifndef expressions_fieldExprParser_H
#define expressions_fieldExprParser_H

#include "exprScanToken.H"
#include "fieldExprFwd.H"

namespace Foam
{
namespace expressions
{
namespace fieldExpr
{

/*---------------------------------------------------------------------------*\
                           Class parser Declaration
\*---------------------------------------------------------------------------*/

class parser
{
    // Private Data

        //- Prompt for parser tracing
        static constexpr const char* const prompt_ = "fieldExpr:";

        //- The lemon parser (demand-driven)
        void* lemon_;


public:

    //- Local object debugging
    int debug;


    // Constructors

        //- Construct null
        parser() : lemon_(nullptr), debug(fieldExpr::debug) {}


    //- Destructor, deletes parser backend
    ~parser()
    {
        stop();
    }


    // Static Member Functions

        //- Return the text name corresponding to the tokenId
        static word tokenName(int tokenId);

        //- Print all token names
        static void printTokenNames(Ostream& os);

        //- Print all rules
        static void printRules(Ostream& os);


    // Member Functions

        //- Start parsing, with the given driver context
        void start(parseDriver& driver_);

        //- Stop parsing, freeing the allocated parser
        void stop();

        //- Push token type to parser with default token
        void parse(int tokenId);

        //- Push token type/value to parser
        void parse(int tokenId, scanToken tok);
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace fieldExpr
} // End namespace expressions
} // End namespace Foam


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //