public void EvaluatesCorrectly(string expressionString, float expectedResult)
{
// arrange
var expressionNodeFactory = new ExpressionNodeFactory();
var expressionTokenizer = new ExpressionTokenizer();
var infixToPostfixConverter = new InfixToPostfixConverter();
var expressionFactory = new ExpressionFactory(expressionNodeFactory, expressionTokenizer, infixToPostfixConverter);
// act
var expression = expressionFactory.MakeExpression(expressionString);
var result = expression.Evaluate();
// assert
Assert.Equal(expectedResult, result);
}
public static float Evaluate(string str, Dictionary <string, float> variables)
{
var expressionNodeFactory = new ExpressionNodeFactory();
var expressionTokenizer = new ExpressionTokenizer();
var infixToPostfixConverter = new InfixToPostfixConverter();
var expressionFactory = new ExpressionFactory(expressionNodeFactory, expressionTokenizer, infixToPostfixConverter);
var expression = expressionFactory.MakeExpression(str);
foreach (var(symbol, value) in variables)
{
expression.EvaluationContext.GetVariable(symbol).Value = value;
}
return(expression.Evaluate());
}
public void EvaluatesCorrectlyWithAVariableAndSomeStuff()
{
// arrange
var expressionNodeFactory = new ExpressionNodeFactory();
var expressionTokenizer = new ExpressionTokenizer();
var infixToPostfixConverter = new InfixToPostfixConverter();
var expressionFactory = new ExpressionFactory(expressionNodeFactory, expressionTokenizer, infixToPostfixConverter);
// act
var expression = expressionFactory.MakeExpression("(bananas + 1) / 5");
expression.EvaluationContext.GetVariable("bananas").Value = 4.0f;
var result = expression.Evaluate();
// assert
Assert.Equal(1.0f, result);
}