//
public static string GetString(SNodeBase baseNode)
{
if (baseNode is SExpression)
{
SExpression expr = baseNode as SExpression;
if ((expr.Items != null) && (expr.Items.Count > 0) && (expr.Items[0] is SNodeAtom))
{
return((expr.Items[0] as SNodeAtom).Value);
}
else
{
return("");
}
}
else
{
return(""); // error
}
}
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);
}
}