/// <summary>
/// Gets the command for the function called in the specified source tree.
/// </summary>
/// <param name="source">The source Antlr tree representing a function call..</param>
/// <returns>The parsed AstFunctionNode.</returns>
/// <exception cref="NoViableAltException"><c>NoViableAltException</c>.</exception>
private static PostfixMathCommand GetCommandForOperator( ITree source )
{
PostfixMathCommand command;
switch ( source.Type )
{
case TokenTypes.OP_ADD:
command = new Add();
break;
case TokenTypes.OP_SUBTRACT:
command = new Subtract();
break;
case TokenTypes.OP_MULTIPLY:
command = new Multiply();
break;
case TokenTypes.OP_DIVIDE:
command = new Divide();
break;
default:
throw new NoViableAltException();
}
return command;
}
/// <summary>
/// Static function to create a default FunctionSet. This may be called by any
/// object at any time if it needs the standard functions.
/// </summary>
internal static FunctionSet GetDefaultFunctionSet()
{
var fs = new FunctionSet();
fs["+"] = new Add();
fs["-"] = new Subtract();
fs["*"] = new Multiply();
fs["/"] = new Divide();
fs["="] = new Comparator( ComparatorType.EQ );
fs["=="] = new Comparator( ComparatorType.EQ );
fs["<"] = new Comparator( ComparatorType.LT );
fs["<="] = new Comparator( ComparatorType.LE );
fs[">"] = new Comparator( ComparatorType.GT );
fs[">="] = new Comparator( ComparatorType.GE );
fs["!="] = new Comparator( ComparatorType.NE );
fs["<>"] = new Comparator( ComparatorType.NE );
fs["and"] = new And();
fs["or"] = new Or();
fs["not"] = new Not();
fs["if"] = new Conditional();
fs["round"] = new Round();
fs["floor"] = new Floor();
fs["sum"] = new Sum();
fs["min"] = new Min();
fs["max"] = new Max();
fs["avg"] = new Average();
fs["count"] = new Count();
return fs;
}