fieldExprScanner.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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-------------------------------------------------------------------------------
    Copyright (C) 2019-2021 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.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    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::scanner
 
Description
    Ragel lexer/scanner interface for patch expressions.
 
Note
    Ragel code generated with the ./createCode script.
 
\*---------------------------------------------------------------------------*/
 
#ifndef expressions_fieldExprScanner_H
#define expressions_fieldExprScanner_H
 
#include "fieldExprFwd.H"
 
namespace Foam
{
namespace expressions
{
namespace fieldExpr
{
 
/*---------------------------------------------------------------------------*\
                         Class scanner Declaration
\*---------------------------------------------------------------------------*/
 
class scanner
{
    // Private Data
 
        //- Wrapped lemon parser
        parser* parser_;
 
        //- Ragel code state, action
        int cs, act;
 
 
    // Private Member Functions
 
        //- Dispatch .method to parser (if known) or Fatal
        bool dispatch_method
        (
            const parseDriver& driver_,
            word ident  // Receives a copy
        ) const;
 
        //- Dispatch identifier to parser (if possible) or Fatal
        bool dispatch_ident
        (
            const parseDriver& driver_,
            word ident  // Receives a copy
        ) const;
 
 
public:
 
    //- Local debugging
    int debug;
 
 
    // Constructors
 
        //- Default construct, optionally setting debugging
        explicit scanner(bool withDebug = false)
        :
            parser_(nullptr),
            debug(fieldExpr::debug)
        {
            if (withDebug)
            {
                debug |= 4;
            }
        }
 
 
    //- Destructor, deletes parser
    ~scanner();
 
 
    // Member Functions
 
        //- Evaluate sub-string
        bool process
        (
            const std::string& str, size_t pos, size_t len,
            parseDriver& driver_
        );
 
        //- Evaluate sub-string
        bool process
        (
            const std::string& str, size_t pos,
            parseDriver& driver_
        )
        {
            return process(str, pos, std::string::npos, driver_);
        }
 
        //- Evaluate string
        bool process(const std::string& str, parseDriver& driver_)
        {
            return process(str, 0, std::string::npos, driver_);
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fieldExpr
} // End namespace expressions
} // End namespace Foam
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //