public int Add (Token token) {
return List.Add (token);
}
private Token ParseTo (IEnumerator iterator) {
ParseToState state = ParseToState.FunctionName;
Token name = new Token (TokenType.Word, null);
TokenList args = new TokenList ();
TokenList def = new TokenList ();
bool reading = true;
bool prev_newline = false;
while (reading && iterator.MoveNext ()) {
Token token = (Token) iterator.Current;
if (state != ParseToState.Content && token.Type == TokenType.Newline) {
state = ParseToState.Content;
prev_newline = true;
continue;
}
switch (state) {
case ParseToState.FunctionName:
name = token;
state = AdvanceState (state);
break;
case ParseToState.Argument:
case ParseToState.ArgumentWithValue:
case ParseToState.ArgumentCollector:
if (token.Type == TokenType.OpenBracket) {
TokenList arg = ParseBrackets (iterator);
if (state == ParseToState.Argument || (state == ParseToState.ArgumentWithValue && arg.Count == 1)) {
state = AdvanceState (state);
}
args.Add (new Token (TokenType.PlaceholderElement, new Element (ElementType.List, arg)));
} else {
args.Add (token);
}
break;
case ParseToState.Content:
if (prev_newline && token.Type == TokenType.Word && String.Compare ((string) token.Val, "end", true) == 0) {
reading = false;
} else {
def.Add (token);
prev_newline = (token.Type == TokenType.Newline);
}
break;
}
}
TokenList func = new TokenList ();
func.Add (name);
func.Add (new Token (TokenType.PlaceholderGroup, args));
func.Add (new Token (TokenType.PlaceholderGroup, def));
Function func_obj = CreateFunction (func);
funcs.AddMessage (func_obj);
if (to_parse == null)
to_parse = new ArrayList ();
to_parse.Add (func_obj);
return new Token (TokenType.PlaceholderElement, new Element (ElementType.Function, func_obj));
}
private int Weight (Token token) {
char c = (char) token.Val;
if (c == '^') {
return 4;
} else if (c == '*' || c == '/' || c == '\\') {
return 3;
} else if (c == '+' || c == '-') {
return 2;
} else if (c == '=' || c == '<' || c == '>') {
return 1;
} else {
return 0;
}
}
private StringBuilder AddTokens (TokenList tokens, StringBuilder builder, int c_prev_int, int c_peek_int) {
StringBuilder ret;
string val = builder.ToString ();
if (val.Length > 0) {
ret = new StringBuilder ();
} else {
ret = builder;
}
double as_num;
if (IsNumber (val, out as_num)) {
Token token = new Token (TokenType.Number, as_num);
if (tokens[tokens.Count - 1].Type == TokenType.Minus) {
token.Val = -((double) token.Val);
tokens[tokens.Count - 1] = token;
} else {
tokens.Add (token);
}
} else if (val.Length > 1) {
Token token;
string var_name, str_val;
if (IsVariable (val, out var_name))
token = new Token (TokenType.Variable, var_name);
else if (IsString (val, out str_val))
token = new Token (TokenType.String, str_val);
else
token = new Token (TokenType.Word, val);
tokens.Add (token);
} else if (val.Length == 1) {
tokens.Add (TokenForChar (c_prev_int, c_peek_int, val[0]));
}
return ret;
}