public void TestEvaluate()
{
var mockExpression = Mock.Of <IExpression>(e => e.Evaluate(It.IsAny <IDictionary <string, object> >()) == (object)1);
var expression = new ParenthesisedExpression(mockExpression);
Assert.AreEqual(1, expression.Evaluate(null));
}
internal Expression ParseParenthesised() // E -> (E) E'
{
if (this.input.Read() is OpenParenthesisToken)
{
var internalTokens = new List <Token>();
int parenthesisNum = 1;
while (true)
{
var t = this.input.Read();
if (t == null)
{
throw new ArgumentException("Parenthesis not closed.");
}
else if (t is CloseParenthesisToken)
{
if (--parenthesisNum <= 0)
{
break;
}
}
else if (t is OpenParenthesisToken)
{
++parenthesisNum;
}
internalTokens.Add(t);
}
Expression ex = Parse(internalTokens);
if (ex != null)
{
Expression res = new ParenthesisedExpression()
{
Oprand = ex
};
return(this.ParseExPrime(res));
}
else
{
throw new ArgumentException("Failed parse Parenthesised Expression");
}
}
else
{
this.input.Unread();
return(null);
}
}
public void TestNullEvaluate()
{
var expression = new ParenthesisedExpression(null);
Assert.AreEqual(1, expression.Evaluate(null));
}
