/// <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 while within a variable 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;
if ((result = PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisTokenType.Closed))
{
state = new PerenthesisTokenParseState();
}
else if ((result = InfixFunctionToken.TryParse(internalLine, out token) || ArithmeticOperatorToken.TryParse(internalLine, out token) || BinaryOperatorToken.TryParse(internalLine, out token) || BooleanOperatorToken.TryParse(internalLine, out token) || AssignmentOperatorToken.TryParse(internalLine, out token)))
{
state = new InfixOperationParseState();
}
else if ((result = PostfixFunctionToken.TryParse(internalLine, out token)))
{
state = new PostfixFunctionParseState();
}
else if ((result = CommentToken.TryParse(internalLine, out token)))
{
state = new NullTokenParseState();
}
else
{
state = new InvalidTokenParseState();
}
return(result);
}
/// <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>
/// Parses tokens out of the string given.
/// </summary>
/// <param name="line"></param>
private void ParseTokens(string line)
{
string internalLine = line;
Regex spaceRegex = new Regex("^[\\s]+", RegexOptions.Compiled | RegexOptions.CultureInvariant);
TokenParseState tokenParseState = new NullTokenParseState();
while (!String.IsNullOrEmpty(internalLine))
{
Token token = new NullToken();
bool tokenIsValid = false;
if (spaceRegex.IsMatch(internalLine))
{
int length = spaceRegex.Matches(internalLine)[0].Value.Length;
internalLine = RemoveToken(length, internalLine);
}
else
{
tokenIsValid = tokenParseState.GetNextToken(internalLine, out token, out tokenParseState);
#region Old Conditional Code
// if (lastToken is NullToken)
// {
// if (GetFirstToken(internalLine, out token))
// {
// tokenIsValid = true;
// }
// else if (InfixFunctionToken.TryParse(internalLine, out token)
// || ArithmeticOperatorToken.TryParse(internalLine, out token)
// || BinaryOperatorToken.TryParse(internalLine, out token)
// || BooleanOperatorToken.TryParse(internalLine, out token)
// || PostfixFunctionToken.TryParse(internalLine, out token))
// {
// _tokens.Add(CalculatorContext.GetInstance()[CalculatorContext.LastResult]);
// lastToken = _tokens[0];
// }
// else
// {
// throw new InvalidTokenException(String.Format("Invalid or unrecognized token at {0}.", internalLine));
// }
// }
// else if (lastToken is VariableToken)
// {
// if ((PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisType.Closed)
// || InfixFunctionToken.TryParse(internalLine, out token)
// || ArithmeticOperatorToken.TryParse(internalLine, out token)
// || BinaryOperatorToken.TryParse(internalLine, out token)
// || BooleanOperatorToken.TryParse(internalLine, out token)
// || PostfixFunctionToken.TryParse(internalLine, out token)
// || AssignmentOperatorToken.TryParse(internalLine, out token)
// || CommentToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// }
// else if (lastToken is NumberToken || lastToken is BooleanToken)
// {
// if ((PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisType.Closed)
// || InfixFunctionToken.TryParse(internalLine, out token)
// || ArithmeticOperatorToken.TryParse(internalLine, out token)
// || BinaryOperatorToken.TryParse(internalLine, out token)
// || BooleanOperatorToken.TryParse(internalLine, out token)
// || PostfixFunctionToken.TryParse(internalLine, out token)
// || CommentToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// }
// else if (lastToken is PerenthesisToken)
// {
// if (PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == ((PerenthesisToken)lastToken).PerenthesisType
// || CommentToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// else if (((PerenthesisToken)lastToken).PerenthesisType == PerenthesisType.Open)
// {
// if (PrefixFunctionToken.TryParse(internalLine, out token)
// || BooleanToken.TryParse(internalLine, out token)
// || VariableToken.TryParse(internalLine, out token)
// || ConstantToken.TryParse(internalLine, out token)
// || NumberToken.TryParse(internalLine, out token)
// || LastResultToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// }
// else
// {
// if (InfixFunctionToken.TryParse(internalLine, out token)
// || ArithmeticOperatorToken.TryParse(internalLine, out token)
// || BinaryOperatorToken.TryParse(internalLine, out token)
// || BooleanOperatorToken.TryParse(internalLine, out token)
// || PostfixFunctionToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// }
// }
// else if (lastToken is PrefixFunctionToken
// && ((PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisType.Open)
// || lastToken.ToString().Equals("!", StringComparison.InvariantCultureIgnoreCase)
// && (BooleanToken.TryParse(internalLine, out token)
// || VariableToken.TryParse(internalLine, out token)
// || ConstantToken.TryParse(internalLine, out token)
// || NumberToken.TryParse(internalLine, out token))))
// {
// tokenIsValid = true;
// }
// else if (lastToken is InfixFunctionToken || lastToken is OperatorToken)
// {
// if (PrefixFunctionToken.TryParse(internalLine, out token)
// || BooleanToken.TryParse(internalLine, out token)
// || VariableToken.TryParse(internalLine, out token)
// || ConstantToken.TryParse(internalLine, out token)
// || NumberToken.TryParse(internalLine, out token)
// || LastResultToken.TryParse(internalLine, out token)
// || (PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisType.Open)
// || CommentToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// }
// else if (lastToken is PostfixFunctionToken)
// {
// if ((PerenthesisToken.TryParse(internalLine, out token) && ((PerenthesisToken)token).PerenthesisType == PerenthesisType.Closed)
// || InfixFunctionToken.TryParse(internalLine, out token)
// || ArithmeticOperatorToken.TryParse(internalLine, out token)
// || BinaryOperatorToken.TryParse(internalLine, out token)
// || BooleanOperatorToken.TryParse(internalLine, out token)
// || PostfixFunctionToken.TryParse(internalLine, out token)
// || CommentToken.TryParse(internalLine, out token))
// {
// tokenIsValid = true;
// }
// }
// else
// {
// throw new InvalidTokenException(String.Format("Invalid or unrecognized token at {0}.", internalLine));
// }
#endregion
if (tokenIsValid)
{
internalLine = AddTokenToCollection(token, internalLine);
_context[CalculatorContext.LastToken] = token;
}
CheckForLastResultImplication();
}
}
}
