private static Token ToToken(string token)
{
var ret = new Token {
Value = token, TokenType = Token.Symbol.Variable
};
if (token.Length == 1 && OperatorTokens.Contains(token.First()))
{
if (token == "(" || token == ")")
{
ret.TokenType = Token.Symbol.Bracket;
}
else
{
ret.TokenType = Token.Symbol.Operator;
}
}
else if (FunctionTokens.ContainsKey(token))
{
ret.TokenType = Token.Symbol.Function;
}
else if (IsDigit(token.First()))
{
ret.TokenType = Token.Symbol.Number;
ret.Number = decimal.Parse(token);
}
return(ret);
}
/// <summary>
/// Converts the expected token to its lexeme equivalent
/// </summary>
public static string GetExpectedLexeme(Tokens desired)
{
string expected = "";
if ((int)desired < KeyWords.Count)
{
expected = "\"" + KeyWords[(int)desired] + "\"";
}
else if (OperatorTokens.Contains(desired))
{
expected = "an operator";
}
else if (desired == Tokens.IdT)
{
expected = "an identifier";
}
else if (desired == Tokens.NumT)
{
expected = "a number";
}
else if (desired == Tokens.LParenT)
{
expected = "\"(\"";
}
else if (desired == Tokens.RParenT)
{
expected = "\")\"";
}
else if (desired == Tokens.LBrackT)
{
expected = "\"[\"";
}
else if (desired == Tokens.RBrackT)
{
expected = "\"]\"";
}
else if (desired == Tokens.LBraceT)
{
expected = "\"{\"";
}
else if (desired == Tokens.RBraceT)
{
expected = "\"}\"";
}
else if (desired == Tokens.CommaT)
{
expected = "\",\"";
}
else if (desired == Tokens.SemiT)
{
expected = "\";\"";
}
else if (desired == Tokens.PeriodT)
{
expected = "\".\"";
}
return(expected);
}
