/// <summary>
/// Gets a Token of type LastResultToken from the beginning of a line of text. The resulting token
/// needs to be a value token, like BooleanToken or NumberToken.
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public new static Token Parse(string line)
{
Token token = new NullToken();
if (LastResultToken.__constantPattern.IsMatch(line))
{
string matchText = LastResultToken.__constantPattern.Matches(line)[0].Value;
if (matchText.Equals("$", StringComparison.InvariantCultureIgnoreCase))
{
token = new LastResultToken(CalculatorContext.GetInstance().GetLastResult(), matchText);
Token intermediateToken = new NullToken();
if (NumberToken.TryParse(token.ToString(), out intermediateToken, true) ||
BooleanToken.TryParse(token.ToString(), out intermediateToken, true))
{
token = intermediateToken;
}
}
}
return(token);
}
/// <summary>
/// Gets the next token while in the set container token parse state.
/// </summary>
/// <param name="internalLine"></param>
/// <param name="token"></param>
/// <param name="state"></param>
/// <returns></returns>
public override bool GetNextToken(string internalLine, out Token token, out TokenParseState state)
{
bool result = false;
Token lastToken = CalculatorContext.GetInstance()[CalculatorContext.LastToken];
if ((result = SetContainerToken.TryParse(internalLine, out token) && ((SetContainerToken)token).SetContainerType == ((SetContainerToken)lastToken).SetContainerType))
{
state = new SetContainerTokenParseState();
}
else if ((result = CommentToken.TryParse(internalLine, out token)))
{
state = new NullTokenParseState();
}
else if (((SetContainerToken)lastToken).SetContainerType == SetContainerTokenType.Open)
{
if ((result = PrefixFunctionToken.TryParse(internalLine, out token)))
{
state = new PrefixFunctionTokenParseState();
}
else if ((result = BooleanToken.TryParse(internalLine, out token) || ConstantToken.TryParse(internalLine, out token) || NumberToken.TryParse(internalLine, out token) || LastResultToken.TryParse(internalLine, out token)))
{
state = new ValueTokenParseState();
}
else if ((result = VariableToken.TryParse(internalLine, out token)))
{
state = new VariableTokenParseState();
}
else
{
state = new InvalidTokenParseState();
}
}
else if ((result = InfixFunctionToken.TryParse(internalLine, out token) || ArithmeticOperatorToken.TryParse(internalLine, out token) || BinaryOperatorToken.TryParse(internalLine, out token) || BooleanOperatorToken.TryParse(internalLine, out token)))
{
state = new InfixOperationParseState();
}
else if ((result = PostfixFunctionToken.TryParse(internalLine, out token)))
{
state = new PostfixFunctionParseState();
}
else
{
state = new InvalidTokenParseState();
}
return(result);
}
/// <summary>
/// Gets the next token while within ta prefix function token parse state.
/// </summary>
/// <param name="internalLine"></param>
/// <param name="token"></param>
/// <param name="state"></param>
/// <returns></returns>
public override bool GetNextToken(string internalLine, out Token token, out TokenParseState state)
{
bool result = false;
Token lastToken = CalculatorContext.GetInstance()[CalculatorContext.LastToken];
if ((result = (PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisTokenType.Open)))
{
state = new PerenthesisTokenParseState();
}
else if (lastToken.ToString().Equals("!", StringComparison.InvariantCultureIgnoreCase))
{
if ((result = BooleanToken.TryParse(internalLine, out token) || ConstantToken.TryParse(internalLine, out token) || NumberToken.TryParse(internalLine, out token)))
{
state = new ValueTokenParseState();
}
else if ((result = VariableToken.TryParse(internalLine, out token)))
{
state = new VariableTokenParseState();
}
else
{
state = new InvalidTokenParseState();
}
}
else
{
state = new InvalidTokenParseState();
}
return(result);
}
/// <summary>
/// Gets the next token while within an infix operation parse state.
/// </summary>
/// <param name="internalLine"></param>
/// <param name="token"></param>
/// <param name="state"></param>
/// <returns></returns>
public override bool GetNextToken(string internalLine, out Token token, out TokenParseState state)
{
bool result = false;
if ((result = PrefixFunctionToken.TryParse(internalLine, out token)))
{
state = new PrefixFunctionTokenParseState();
}
else if ((result = BooleanToken.TryParse(internalLine, out token) || ConstantToken.TryParse(internalLine, out token) || NumberToken.TryParse(internalLine, out token) || LastResultToken.TryParse(internalLine, out token)))
{
state = new ValueTokenParseState();
}
else if ((result = VariableToken.TryParse(internalLine, out token)))
{
state = new VariableTokenParseState();
}
else if ((result = (PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisTokenType.Open)))
{
state = new PerenthesisTokenParseState();
}
else if ((result = CommentToken.TryParse(internalLine, out token)))
{
state = new NullTokenParseState();
}
else
{
state = new InvalidTokenParseState();
}
return(result);
}
/// <summary>
/// Gets the next Token if the last token was a NullToken. It first tries to get a normal,
/// valid first token. If that fails, then it checks for a normal secondary token, and if
/// that passes then the context LastResultIsImplied is set to true.
/// </summary>
/// <param name="internalLine"></param>
/// <param name="token"></param>
/// <returns></returns>
public override bool GetNextToken(string internalLine, out Token token, out TokenParseState state)
{
bool result = false;
if ((result = PerenthesisToken.TryParse(internalLine, out token)))
{
state = new PerenthesisTokenParseState();
}
else if ((result = PrefixFunctionToken.TryParse(internalLine, out token)))
{
state = new PrefixFunctionTokenParseState();
}
else if ((result = BooleanToken.TryParse(internalLine, out token) || ConstantToken.TryParse(internalLine, out token) || NumberToken.TryParse(internalLine, out token) || LastResultToken.TryParse(internalLine, out token)))
{
state = new ValueTokenParseState();
}
else if ((result = VariableToken.TryParse(internalLine, out token)))
{
state = new VariableTokenParseState();
}
else if ((result = InfixFunctionToken.TryParse(internalLine, out token) || ArithmeticOperatorToken.TryParse(internalLine, out token) || BinaryOperatorToken.TryParse(internalLine, out token) || BooleanOperatorToken.TryParse(internalLine, out token)))
{
state = new InfixOperationParseState();
CalculatorContext.GetInstance().LastResultIsImplied = true;
}
else if ((result = PostfixFunctionToken.TryParse(internalLine, out token)))
{
state = new PostfixFunctionParseState();
CalculatorContext.GetInstance().LastResultIsImplied = true;
}
else
{
state = new InvalidTokenParseState();
}
return(result);
}