public void VariableTestMethod()
{
String expression = @"result1 = num1 + num2;" +
@"result2 = result1 * 10;" +
@"result2";
ExpressionCompiler compiler = new ExpressionCompiler();
ExpressionContext context = new ExpressionContext();
Int32 num1 = 1;
Int32 num2 = 2;
context.Bind(nameof(num1), num1);
context.Bind(nameof(num2), num2);
Assert.IsTrue(compiler.TryEvaluate(expression, context, out Int32 value) && value == (num1 + num2) * 10 &&
context.TryLookup("result1", out Int32 result1) && result1 == num1 + num2 &&
context.TryLookup("result2", out Int32 result2) && result2 == value);
}
public void ConstantTestMethod()
{
String expression = @"PI * Pow(r, 2);";
ExpressionCompiler compiler = new ExpressionCompiler();
ExpressionContext context = new ExpressionContext();
context.Bind("r", 10);
Assert.IsTrue(compiler.TryEvaluate(expression, context, out Decimal value) && value == (Decimal)(Math.PI * Math.Pow(10, 2)));
}
public override Object Evaluate(ExpressionContext context)
{
if (Operand1 is VariableExpression variableExpression)
{
OperandValue2 = Operand2.Evaluate(context);
context.Bind(variableExpression.VariableName, OperandValue2);
}
return(null);
}
