public void ParseUnitTest()
{
UnitsCore uc = new UnitsCore();
var cm = new Unit("cm", Dimensions.Length, 0.01);
var ft = new Unit("ft", Dimensions.Length, 0.3048);
var min = new Unit("min", Dimensions.Time, 60.0);
var s = new Unit("s", Dimensions.Time, 1.0);
var cfm = new Unit("CFM", ft.Pow(3) / min);
uc.RegisterUnit(cm);
uc.RegisterUnit(s);
var u1 = uc.ParseUnit("cm");
Assert.IsTrue(u1 == cm);
var u2 = uc.ParseUnit("cm*cm");
Assert.IsTrue(u2 == cm * cm);
var u3 = uc.ParseUnit("cm^2");
Assert.IsTrue(u3 == cm * cm);
var u4 = uc.ParseUnit("cm^2.5/cm^1.5");
Assert.IsTrue(u4 == cm);
//flow over area -> speed
var u5 = uc.ParseUnit("cm^3*s^-1/cm^2");
Assert.IsTrue(u5 == cm / s);
}
public Operation Build(IList <Token> tokens, UnitsCore unitsCore)
{
resultStack.Clear();
operatorStack.Clear();
parameterCount.Clear();
foreach (Token token in tokens)
{
object value = token.Value;
switch (token.TokenType)
{
case TokenType.Number:
resultStack.Push(new FloatingPointConstant((double)token.Value));
break;
case TokenType.Text:
if (functionRegistry.IsFunctionName((string)token.Value))
{
operatorStack.Push(token);
parameterCount.Push(1);
}
else
{
resultStack.Push(new Variable(((string)token.Value).ToLowerInvariant()));
}
break;
case TokenType.Unit:
resultStack.Push(new ChangeUnit(resultStack.Pop(), unitsCore.ParseUnit((string)token.Value)));
//perform unit conversion
break;
case TokenType.LeftBracket:
operatorStack.Push(token);
break;
case TokenType.RightBracket:
PopOperations(true, token);
//parameterCount.Pop();
break;
case TokenType.ArgumentSeparator:
PopOperations(false, token);
parameterCount.Push(parameterCount.Pop() + 1);
break;
case TokenType.Operation:
Token operation1Token = token;
char operation1 = (char)operation1Token.Value;
while (operatorStack.Count > 0 && (operatorStack.Peek().TokenType == TokenType.Operation ||
operatorStack.Peek().TokenType == TokenType.Text))
{
Token operation2Token = operatorStack.Peek();
bool isFunctionOnTopOfStack = operation2Token.TokenType == TokenType.Text;
if (!isFunctionOnTopOfStack)
{
char operation2 = (char)operation2Token.Value;
if ((IsLeftAssociativeOperation(operation1) &&
operationPrecedence[operation1] <= operationPrecedence[operation2]) ||
(operationPrecedence[operation1] < operationPrecedence[operation2]))
{
operatorStack.Pop();
resultStack.Push(ConvertOperation(operation2Token));
}
else
{
break;
}
}
else
{
operatorStack.Pop();
resultStack.Push(ConvertFunction(operation2Token));
}
}
operatorStack.Push(operation1Token);
break;
}
}
PopOperations(false, null);
VerifyResultStack();
return(resultStack.First());
}
