negEntry.C

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License
    This file is part of OpenFOAM.
 
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#include "negEntry.H"
#include "addToMemberFunctionSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionEntries
{
    defineFunctionTypeNameAndDebug(negEntry, 0);
 
    addToMemberFunctionSelectionTable
    (
        functionEntry,
        negEntry,
        execute,
        primitiveEntryIstream
    );
}
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
Foam::string Foam::functionEntries::negEntry::negateVariable
(
    const dictionary& parentDict,
    Istream& is
)
{
    // Read variable name as a word including the '$'
    const variable var(is);
 
    // Strip the leading '$' from the variable name
    const string varName = var(1, var.size() - 1);
 
    // Lookup the variable name in the parent dictionary....
    const entry* ePtr = parentDict.lookupScopedEntryPtr(varName, true, false);
 
    if (ePtr && ePtr->isStream())
    {
        const token variable(ePtr->stream());
 
        // Convert to a string
        OStringStream os(is.format());
        os << variable;
        const string str(os.str());
 
        // Negate
        if (str[0] == '-')
        {
            return str(1, str.size() - 1);
        }
        else
        {
            return '-' + str;
        }
    }
    else
    {
        FatalIOErrorInFunction
        (
            parentDict
        )   << "Unknown dictionary variable name " << varName << endl
            << "Valid dictionary entries are " << parentDict.toc()
            << exit(FatalIOError);
 
        return string::null;
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
bool Foam::functionEntries::negEntry::execute
(
    const dictionary& contextDict,
    primitiveEntry& contextEntry,
    Istream& is
)
{
    return insert(contextDict, contextEntry, negateVariable(contextDict, is));
}
 
 
// ************************************************************************* //