stringOpsEvaluate.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2019 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/>.
 
\*---------------------------------------------------------------------------*/
 
#include "stringOpsEvaluate.H"
#include "stringOps.H"
#include "StringStream.H"
#include "fieldExprDriver.H"
#include "error.H"
 
// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
Foam::string Foam::stringOps::evaluate
(
    const std::string& str,
    size_t pos,
    size_t len
)
{
 
    const auto trimPoints = stringOps::findTrim(str, pos, len);
 
    pos = trimPoints.first;
    len = (trimPoints.second - trimPoints.first);
 
    if (!len)
    {
        return "";
    }
 
 
    expressions::exprResult result;
    {
        expressions::fieldExprDriver driver(1);
        driver.parse(str, pos, len);
        result = std::move(driver.result());
    }
 
    if (!result.hasValue() || !result.size())
    {
        InfoErr
            << "Failed evaluation: "
            << str.substr(pos, len) << nl;
 
        return "";
    }
 
    OStringStream os;
    result.writeValue(os);
 
    return os.str();
}
 
 
// ************************************************************************* //