private void Print_sub(SNodeBase x, int depth)
{
Console.Write(new String(' ', depth));
//if ((x.Type & Types.Atom) == Types.Atom)
if (x is SNodeAtom)
{
//if ((x.Type & Types.String) == Types.String)
if (x is SNodeAtom)
{
Console.WriteLine(String.Format("{0}", x.ToString()));
}
else if ((x.Type & Types.Symbol) == Types.Symbol)
{
Console.WriteLine(String.Format("symbol: {0}", x.ToString()));
}
else if ((x.Type & Types.Number) == Types.Number)
{
Console.WriteLine(String.Format("number: {0}", x.ToString()));
}
}
//else if ((x.Type & Types.List) == Types.List)
else if (x is SNodeList)
{
Console.WriteLine("(");
SNodeList list = x as SNodeList;
foreach (SNodeBase y in list.Items)
{
Print_sub(y, depth + 1);
}
Console.WriteLine(new String(' ', depth) + ")");
}
}
private SNodeBase ParseList(CLex lexer)
{
SNodeList node = new SNodeList();
node.Items = new List <SNodeBase>();
lexer.GetToken();
while ((lexer.CurToken.Type != TokenType.EOF) &&
!((lexer.CurToken.Type == TokenType.Symbol) &&
(lexer.CurToken.Value == ")")
)
)
{
//
node.Items.Add(ParseNode(lexer));
}
// == )
lexer.GetToken();
return(node);
}
private SNodeBase ParseNode(CLex lexer)
{
if ((lexer.CurToken.Type == TokenType.Symbol) &&
(lexer.CurToken.Value == "("))
{
//return ParseList(lexer);
SNodeBase node = ParseList(lexer);
if (node is SNodeList)
{
SNodeList list = node as SNodeList;
//
if (list.Items.Count > 0)
{
SExpression sexpr = new SExpression();
if (list.Items[0] is SNodeAtom)
{
SNodeAtom value = list.Items[0] as SNodeAtom;
sexpr.Name = value.Value;
}
sexpr.Items = new List <SNodeBase>();
for (int index = 1; index < list.Items.Count; index++)
{
sexpr.Items.Add(list.Items[index]);
}
//
return(sexpr);
}
else
{
return(node);
}
}
else
{
return(node);
}
}
else
{
// string
SNodeAtom node;
if (lexer.CurToken.Type == TokenType.StringLiteral)
{
string value = lexer.CurToken.Value;
if (value.StartsWith("\"") && value.EndsWith("\""))
{
value = value.Substring(1, value.Length - 2);
// descape " and \
}
node = new SNodeAtom(value);
}
else
{
node = new SNodeAtom(lexer.CurToken.Value);
}
lexer.GetToken();
return(node);
}
}