public void ShouldSetValue()
{
ValueEnvironment environment = new ValueEnvironment();
environment.SetValue("foo", "bar");
Assert.AreEqual("bar", environment.GetValue("foo"));
}
public void ShouldResetValueUsingResetInTrue()
{
ValueEnvironment environment = new ValueEnvironment();
environment.SetValue("foo", "bar");
environment.SetValue("foo", "rebar", true);
}
public void ShouldRaiseIfTryToSetAnAlreadyDefinedValueWithResetInFalse()
{
ValueEnvironment environment = new ValueEnvironment();
environment.SetValue("foo", "bar");
environment.SetValue("foo", "newbar", false);
}
public object Apply(Machine machine, ValueEnvironment environment, object[] argumentValues)
{
foreach (DefinedMacro macro in this.macros)
if ((macro.Arity == 0 && argumentValues == null) || macro.Arity == argumentValues.Length || (macro.Arity <= argumentValues.Length && macro.VariableArity))
return macro.Apply(machine, environment, argumentValues);
throw new InvalidOperationException("Invalid number of parameters");
}
public void ShouldGetValueFromParent()
{
ValueEnvironment parent = new ValueEnvironment();
ValueEnvironment environment = new ValueEnvironment(parent);
parent.SetValue("foo", "bar");
Assert.AreEqual("bar", environment.GetValue("foo"));
}
public void ShouldSetAndGetLocalValue()
{
ValueEnvironment parent = new ValueEnvironment();
ValueEnvironment environment = new ValueEnvironment(parent);
environment.SetValue("foo", "bar");
Assert.AreEqual("bar", environment.GetValue("foo"));
Assert.IsNull(parent.GetValue("foo"));
}
public object Apply(Machine machine, ValueEnvironment environment, object[] argumentValues)
{
ValueEnvironment newenv = new ValueEnvironment(environment);
if (argumentValues == null && this.Arity != 0 && !this.VariableArity)
throw new InvalidOperationException("Invalid number of parameters");
if (argumentValues != null && !this.VariableArity && argumentValues.Length != this.Arity)
throw new InvalidOperationException("Invalid number of parameters");
if (argumentValues != null && this.VariableArity && argumentValues.Length < this.Arity)
throw new InvalidOperationException("Invalid number of parameters");
if (this.name != null)
newenv.SetValue(this.name, this);
int k = 0;
bool islast = false;
// TODO refactor see DefinedFunction
foreach (Symbol argname in this.arguments)
{
if (argname.Name == "&")
islast = true;
else
{
if (!islast)
newenv.SetValue(argname.Name, argumentValues[k++]);
else
{
IList rest = new ArrayList();
while (k < argumentValues.Length)
rest.Add(argumentValues[k++]);
if (rest.Count > 0)
newenv.SetValue(argname.Name, rest);
else
newenv.SetValue(argname.Name, null);
}
}
}
object result = machine.Evaluate(MacroUtilities.Expand(this.body, machine, newenv), newenv);
result = machine.Evaluate(result, environment);
return result;
}
public static object Expand(object obj, Machine machine, ValueEnvironment environment)
{
if (obj == null)
return null;
if (obj is string)
return obj;
if (!(obj is IList))
return obj;
IList list = (IList)obj;
if (IsMacro(list))
return machine.Evaluate(list[1], environment);
ArrayList newlist = new ArrayList();
foreach (object element in list)
{
if (element is IList)
{
IList elementList = (IList)element;
if (IsListMacro(elementList))
{
newlist.AddRange((ICollection)machine.Evaluate(elementList[1], environment));
continue;
}
}
newlist.Add(Expand(element, machine, environment));
}
if (obj is System.Array)
return newlist.ToArray();
if (obj is IPersistentVector)
return PersistentVector.Create(newlist);
return newlist;
}
public object Evaluate(object obj, ValueEnvironment environment)
{
if (obj == null)
return null;
if (Utilities.IsEvaluable(obj))
return Utilities.ToExpression(obj).Evaluate(this, environment);
return obj;
}
public static Variable ToVariable(Machine machine, ValueEnvironment environment, Symbol symbol)
{
string ns = symbol.Namespace;
if (String.IsNullOrEmpty(ns))
ns = (string)environment.GetValue(Machine.CurrentNamespaceKey);
string name = symbol.Name;
Variable variable = machine.GetVariable(ns, name);
if (variable == null)
variable = Variable.Intern(machine, ns, name);
return variable;
}
public static string[] EvaluateBindings(Machine machine, ValueEnvironment newenv, ICollection bindings)
{
if ((bindings.Count % 2) != 0)
throw new InvalidOperationException("Let should receive a collection as first argument with even length");
int k = 0;
string name = null;
string[] names = new string[bindings.Count / 2];
foreach (object obj in bindings)
{
if ((k % 2) == 0)
{
// TODO review if Name or FullName
if (obj is INamed)
name = ((INamed)obj).FullName;
else if (obj is string)
name = (string)obj;
else
throw new InvalidOperationException("Let expect a symbol or a string to name a value");
names[k / 2] = name;
}
else
newenv.SetValue(name, machine.Evaluate(obj, newenv), true);
k++;
}
return names;
}
public void ShouldGetNullIfNoValue()
{
ValueEnvironment environment = new ValueEnvironment();
Assert.IsNull(environment.GetValue("foo"));
}
public object Apply(Machine machine, ValueEnvironment environment, object[] argumentValues)
{
ValueEnvironment newenv = new ValueEnvironment(environment);
if (argumentValues == null && this.Arity != 0 && !this.VariableArity)
throw new InvalidOperationException("Invalid number of parameters");
if (argumentValues != null && !this.VariableArity && argumentValues.Length != this.Arity)
throw new InvalidOperationException("Invalid number of parameters");
if (argumentValues != null && this.VariableArity && argumentValues.Length < this.Arity)
throw new InvalidOperationException("Invalid number of parameters");
if (this.name != null)
newenv.SetValue(this.name, this);
int k = 0;
bool islast = false;
foreach (Symbol argname in this.arguments)
{
if (argname.Name == "&")
islast = true;
else
{
if (!islast)
{
newenv.SetValue(argname.Name, argumentValues[k]);
k++;
}
else
{
IList rest = new ArrayList();
while (argumentValues != null && k < argumentValues.Length)
rest.Add(argumentValues[k++]);
if (rest.Count > 0)
newenv.SetValue(argname.Name, rest);
else
newenv.SetValue(argname.Name, null);
}
}
}
object result = this.expression.Evaluate(machine, newenv);
while (result != null && result is RecursionData)
{
RecursionData data = (RecursionData)result;
if (Utilities.GetArity(data.Arguments) != Utilities.GetArity(this.arguments))
throw new InvalidOperationException("Invalid recursion data");
newenv = new ValueEnvironment(environment);
k = 0;
foreach (Symbol argname in this.arguments)
newenv.SetValue(argname.Name, data.Arguments[k++]);
result = this.expression.Evaluate(machine, newenv);
}
return result;
}
public ValueEnvironment(ValueEnvironment parent)
{
this.parent = parent;
}
