public SeriesExpressionParser()
{
// default resolver requires adding variables in advance
m_variableResolver = new VariableResolver();
m_VariableParser = new VariableParser();
}
public SeriesExpressionParser(TimeSeriesDatabase db, LookupOption lookup = LookupOption.SeriesName)
{
m_db = db;
m_variableResolver = new VariableResolver(db, lookup);
m_VariableParser = new VariableParser();
}