public static Token Parse(string strToken) {
strToken = strToken.Trim();
Token t = new Token();
t.StringValue = strToken.Trim();
double temp;
if (strToken == "") {
t = null;
} else if (strToken == "(") {
t.Symbol = TokenSymbol.LPAR;
} else if (strToken == ")") {
t.Symbol = TokenSymbol.RPAR;
} else if (double.TryParse(strToken, NumberStyles.Float, CultureInfo.InvariantCulture.NumberFormat, out temp)) {
t.Symbol = TokenSymbol.NUMBER;
t.DoubleValue = double.Parse(strToken, CultureInfo.InvariantCulture.NumberFormat);
} else {
t.Symbol = TokenSymbol.SYMB;
t.StringValue = t.StringValue.ToUpper();
}
return t;
}
private void Expect(Token token, Queue<Token> tokens) {
Token cur = tokens.Dequeue();
if (!token.Equals(cur)) throw new FormatException("Expected: " + token.StringValue + ", but got: " + cur.StringValue);
}
private ISymbolicExpressionTreeNode CreateTree(Token token) {
if (token.Symbol != TokenSymbol.SYMB) throw new FormatException("Expected function symbol, but got: " + token.StringValue);
return knownSymbols[token.StringValue].CreateTreeNode();
}