public static IExpression GetMarriedWomanExpression()
{
IExpression julie = new TerminalExpression("Julie");
IExpression married = new TerminalExpression("Married");
return(new AndExpression(julie, married));
}
public static IExpression Build(this string expression)
{
Stack <IExpression> expressionStack = new Stack <IExpression>();
foreach (string value in expression.Split(" "))
{
IExpression resultExpression;
if (int.TryParse(value, out int number))
{
resultExpression = new TerminalExpression(number);
}
else
{
IExpression secondExpression = expressionStack.Pop();
IExpression firstExpression = expressionStack.Pop();
resultExpression = value switch
{
"+" => new AddExpression(firstExpression, secondExpression),
"-" => new SubtractExpression(firstExpression, secondExpression),
"*" => new MultiplyExpression(firstExpression, secondExpression),
"/" => new DivideExpression(firstExpression, secondExpression),
_ => throw new Exception("Invalid operation")
};
}
expressionStack.Push(resultExpression);
}
return(expressionStack.Pop());
}
}
public static IExpression GetMaleExpression()
{
IExpression robert = new TerminalExpression("Robert");
IExpression john = new TerminalExpression("John");
return(new OrExpression(robert, john));
}
public static Expression getMarriedWomanExpression()
{
Expression Mary = new TerminalExpression("Mary");
Expression Married = new TerminalExpression("Married");
return(new AndExpression(Married, Mary));
}
public static Expression GetMaleExpression()
{
Expression Zac = new TerminalExpression("Zac");
Expression Jean = new TerminalExpression("Jean");
return(new OrExpression(Zac, Jean));
}
//builds the interpreter tree and defines the rule "Site1 and (Bonus1 or (User1 or User2))"
static Expression BuildInterpreterTree()
{
// Literal
Expression terminal1 = new TerminalExpression("Bonus1");
Expression terminal2 = new TerminalExpression("User1");
Expression terminal3 = new TerminalExpression("User2");
Expression terminal4 = new TerminalExpression("Site1");
Expression alternation1 = new OrExpression(terminal2, terminal3);
Expression alternation2 = new OrExpression(terminal1, alternation1);
return(new AndExpression(terminal4, alternation2));
}
public static IExpression GetMarriedWomanExpression()
{
IExpression e1 = new TerminalExpression()
{
Data = "C"
};
IExpression e2 = new TerminalExpression()
{
Data = "1"
};
return(new AndExpression()
{
Exp1 = e1, Exp2 = e2
});
}
public static IExpression GetMaleExpression()
{
IExpression e1 = new TerminalExpression()
{
Data = "A"
};
IExpression e2 = new TerminalExpression()
{
Data = "B"
};
return(new OrExpression()
{
Exp1 = e1, Exp2 = e2
});
}
private Expression buildTree(string expr)
{
Stack s = new Stack();
for (int i = 0; i < expr.Length; i++)
{
string currChar = expr.Substring(i, 1);
if (isOperator(currChar) == false)
{
Expression e = new TerminalExpression(currChar);
s.Push(e);
}
else
{
Expression r = (Expression)s.Pop();
Expression l = (Expression)s.Pop();
Expression n = getNonTerminalExpression(currChar, l, r);
s.Push(n);
}
}//for
return((Expression)s.Pop());
}
