public void Visit(ArithmeticExpr node)
{
VisitChildren (node);
ApplyOperatorToOperands (node);
}
private Expression ExprAdd()
{
if ((Token.Types)currentToken.Type == Token.Types.Addition ||
(Token.Types)currentToken.Type == Token.Types.Subtraction) {
ArithmeticExpr arithmeticExpr;
if ((Token.Types)currentToken.Type == Token.Types.Addition) {
Match (Token.Types.Addition);
arithmeticExpr = new ArithmeticExpr ("+", currentToken.Row, currentToken.Column);
} else {
Match (Token.Types.Subtraction);
arithmeticExpr = new ArithmeticExpr ("-", currentToken.Row, currentToken.Column);
}
arithmeticExpr.AddChild (Term ());
Expression expression = ExprAdd ();
if (expression.Name != null) {
arithmeticExpr.AddChild (expression);
}
return arithmeticExpr;
} else if ((Token.Types)currentToken.Type == Token.Types.Equal ||
(Token.Types)currentToken.Type == Token.Types.Less ||
(Token.Types)currentToken.Type == Token.Types.And ||
(Token.Types)currentToken.Type == Token.Types.RightParenthesis ||
(Token.Types)currentToken.Type == Token.Types.Range ||
(Token.Types)currentToken.Type == Token.Types.Do ||
(Token.Types)currentToken.Type == Token.Types.Semicolon) {
return new ArithmeticExpr(null, currentToken.Row, currentToken.Column);
}
throw new SyntaxError ("invalid type " + currentToken.Type, currentToken.Row,
currentToken.Column);
}
