public void EvaluateUsingDefaultValuesForArguments()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", 1, false), new Parameter("b", 2, false) };
ICommand body = new ReturnCommand(new BinaryOperatorExpression(new NameExpression("a"), new NameExpression("b"), BinaryOperator.Add));
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
Assert.AreEqual(3, func.Apply(new BindingEnvironment(), null, null));
}
public void CreateSimpleDefinedFunction()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", null, false), new Parameter("b", null, false) };
ICommand body = new SetCommand("c", new NameExpression("a"));
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
Assert.AreEqual(parameters, func.Parameters);
Assert.AreEqual(body, func.Body);
}
public void EvaluateUsingEmptyListArgument()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", null, false), new Parameter("b", null, true) };
ICommand body = new ReturnCommand(new NameExpression("b"));
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
var result = func.Apply(new BindingEnvironment(), new object[] { 1 }, null);
Assert.IsNotNull(result);
Assert.IsInstanceOfType(result, typeof(IList<object>));
var list = (IList<object>)result;
Assert.AreEqual(0, list.Count);
}
public void RaiseWhenOneParameterExpectedAndNoneIsProvided()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", null, false) };
CompositeCommand body = new CompositeCommand();
Machine machine = new Machine();
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
try
{
func.Apply(machine.Environment, null, null);
Assert.Fail("Exception expected");
}
catch (Exception ex)
{
Assert.IsInstanceOfType(ex, typeof(TypeError));
Assert.AreEqual("foo() takes exactly 1 positional argument (0 given)", ex.Message);
}
}
public void RaiseWhenMultipleValuesForKeywordArgument()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", 1, false), new Parameter("b", 2, false) };
ICommand body = new ReturnCommand(new BinaryOperatorExpression(new NameExpression("a"), new NameExpression("b"), BinaryOperator.Add));
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
try
{
func.Apply(new BindingEnvironment(), new object[] { 1 }, new Dictionary<string, object> { { "a", 2 } });
Assert.Fail("Exception expected");
}
catch (Exception ex)
{
Assert.IsInstanceOfType(ex, typeof(TypeError));
Assert.AreEqual("foo() got multiple values for keyword argument 'a'", ex.Message);
}
}
public void RaiseWhenFewParametersProvided()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", null, false), new Parameter("b", null, false) };
CompositeCommand body = new CompositeCommand();
Machine machine = new Machine();
StringWriter writer = new StringWriter();
machine.Output = writer;
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
try
{
func.Apply(machine.Environment, new object[] { 1 }, null);
Assert.Fail("Exception expected");
}
catch (Exception ex)
{
Assert.IsInstanceOfType(ex, typeof(TypeError));
Assert.AreEqual("foo() takes exactly 2 positional arguments (1 given)", ex.Message);
}
}
public void ExecuteFunctionWithReturn()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", null, false), new Parameter("b", null, false) };
CompositeCommand body = new CompositeCommand();
body.AddCommand(new ReturnCommand(new BinaryOperatorExpression(new NameExpression("a"), new NameExpression("b"), BinaryOperator.Add)));
Machine machine = new Machine();
StringWriter writer = new StringWriter();
machine.Output = writer;
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
var result = func.Apply(machine.Environment, new object[] { 1, 2 }, null);
Assert.IsNotNull(result);
Assert.AreEqual(3, result);
}
public void ExecuteFunctionWithPrint()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", null, false), new Parameter("b", null, false) };
CompositeCommand body = new CompositeCommand();
body.AddCommand(new ExpressionCommand(new CallExpression(new NameExpression("print"), new IExpression[] { new NameExpression("a") })));
body.AddCommand(new ExpressionCommand(new CallExpression(new NameExpression("print"), new IExpression[] { new NameExpression("b") })));
Machine machine = new Machine();
StringWriter writer = new StringWriter();
machine.Output = writer;
DefinedFunction func = new DefinedFunction("foo", parameters, body, machine.Environment);
func.Apply(machine.Environment, new object[] { 1, 2 }, null);
Assert.AreEqual("1\r\n2\r\n", writer.ToString());
}
public void EvaluateUsingTwoNamedArguments()
{
IList<Parameter> parameters = new Parameter[] { new Parameter("a", 1, false), new Parameter("b", 2, false) };
ICommand body = new ReturnCommand(new BinaryOperatorExpression(new NameExpression("a"), new NameExpression("b"), BinaryOperator.Add));
DefinedFunction func = new DefinedFunction("foo", parameters, body, null);
var result = func.Apply(new BindingEnvironment(), null, new Dictionary<string, object> { { "a", 2 }, { "b", 3 } });
Assert.IsNotNull(result);
Assert.AreEqual(5, result);
}