// build/get static keyword table
Dictionary <string, FunctionDefinition> GetFunctionTable()
{
if (_fnTbl == null)
{
// create table
_fnTbl = new Dictionary <string, FunctionDefinition>(StringComparer.InvariantCultureIgnoreCase);
// register built-in functions (and constants)
Logical.Register(this);
MathTrig.Register(this);
Text.Register(this);
Statistical.Register(this);
DateAndTime.Register(this);
}
return(_fnTbl);
}