private List <Token.Token> GetToken(string formula)
{
List <Token.Token> tokens = new List <Token.Token>();
string current = "";
foreach (char c in formula)
{
Token.Token nextToken = null;
bool finishCurrent = true;
switch (c)
{
case '^':
nextToken = new SingleCharToken(Token.Token.Type.Operation1, '^');
break;
case '/':
nextToken = new SingleCharToken(Token.Token.Type.Operation2, '/');
break;
case '*':
nextToken = new SingleCharToken(Token.Token.Type.Operation2, '*');
break;
case '+':
nextToken = new SingleCharToken(Token.Token.Type.Operation3, '+');
break;
case '-':
if (current.Length >= 2)
{
// allow - for scientific notation (1e-10)
if (char.ToLower(current[current.Length - 1]) == 'e' &&
char.IsNumber(current[current.Length - 2]))
{
current += '-';
finishCurrent = false;
break;
}
}
nextToken = new SingleCharToken(Token.Token.Type.Operation3, '-');
break;
case ',':
nextToken = new SingleCharToken(Token.Token.Type.Seperator, ',');
break;
case '(':
if (current.Length > 0)
{
// this is a function
nextToken = new FunctionToken(current);
current = "";
}
else
{
nextToken = new SingleCharToken(Token.Token.Type.BracketOpen, '(');
}
break;
case ')':
nextToken = new SingleCharToken(Token.Token.Type.BracketClose, ')');
break;
default:
if (char.IsWhiteSpace(c))
{
break;
}
current += c;
finishCurrent = false;
break;
}
if (finishCurrent && current.Length > 0)
{
// add value token
tokens.Add(MakeTokenFromString(current));
current = "";
}
if (nextToken != null)
{
tokens.Add(nextToken);
}
}
if (current.Length > 0)
{
tokens.Add(MakeTokenFromString(current));
}
return(tokens);
}
private List <Token.Token> GetToken(string formula)
{
List <Token.Token> tokens = new List <Token.Token>();
string current = "";
foreach (char c in formula)
{
Token.Token nextToken = null;
bool finishCurrent = true;
switch (c)
{
case ' ':
break;
case '^':
nextToken = new SingleCharToken(Token.Token.Type.Operation1, '^');
break;
case '/':
nextToken = new SingleCharToken(Token.Token.Type.Operation2, '/');
break;
case '*':
nextToken = new SingleCharToken(Token.Token.Type.Operation2, '*');
break;
case '+':
nextToken = new SingleCharToken(Token.Token.Type.Operation3, '+');
break;
case '-':
nextToken = new SingleCharToken(Token.Token.Type.Operation3, '-');
break;
case ',':
nextToken = new SingleCharToken(Token.Token.Type.Seperator, ',');
break;
case '(':
if (current.Length > 0)
{
// this is a function
nextToken = new FunctionToken(current);
current = "";
}
else
{
nextToken = new SingleCharToken(Token.Token.Type.BracketOpen, '(');
}
break;
case ')':
nextToken = new SingleCharToken(Token.Token.Type.BracketClose, ')');
break;
default:
current += c;
finishCurrent = false;
break;
}
if (finishCurrent && current.Length > 0)
{
// add value token
tokens.Add(MakeTokenFromString(current));
current = "";
}
if (nextToken != null)
{
tokens.Add(nextToken);
}
}
if (current.Length > 0)
{
tokens.Add(MakeTokenFromString(current));
}
return(tokens);
}