public Completion GetValue()
{
if (IsAbrupt())
{
return(this);
}
if (!(value is ReferenceValue reference))
{
return(this);
}
var @base = reference.baseValue;
if (reference.IsUnresolvableReference())
{
return(Completion.ThrowReferenceError($"cannot get {reference.referencedName} from unresolvable reference"));
}
if (reference.IsPropertyReference())
{
if (reference.HasPrimitiveBase())
{
@base = (@base as IValue) !.ToObject().value !;
}
var obj = @base as Object;
return(obj !.InternalGet(reference.referencedName, reference.GetThisValue()));
}
if (!(@base is EnvironmentRecord envRec))
{
throw new InvalidOperationException("Completion.GetValue: baseValue is not a recognized IReferenceable");
}
return(envRec.GetBindingValue(reference.referencedName, reference.strict));
}
public override Completion GetBindingValue(string name, bool strict)
{
if (!bindings.ContainsKey(name))
{
throw new InvalidOperationException("Spec 8.1.1.1.6 step 2");
}
if (bindings[name].Value == null)
{
return(Completion.ThrowReferenceError($"binding {name} does not exist."));
}
return(Completion.NormalCompletion(bindings[name].Value));
}
public Completion GetThisBinding()
{
if (ThisBindingStatus == ThisBindingStatus.Lexical)
{
throw new InvalidOperationException("Spec 8.1.1.3.4 step 2");
}
if (ThisBindingStatus == ThisBindingStatus.Uninitialized)
{
return(Completion.ThrowReferenceError("'this' value is not initialized"));
}
return(Completion.NormalCompletion(ThisValue));
}
public Completion BindThisValue(IValue value)
{
if (ThisBindingStatus == ThisBindingStatus.Lexical)
{
throw new InvalidOperationException("FunctionEnvironmentRecord.BindThisValue: ThisBindingStatus must not be Lexical");
}
if (ThisBindingStatus == ThisBindingStatus.Initialized)
{
return(Completion.ThrowReferenceError("'this' value is already initialized"));
}
ThisValue = value;
ThisBindingStatus = ThisBindingStatus.Initialized;
return(Completion.NormalCompletion(value));
}
public override Completion GetBindingValue(string name, bool strict)
{
var valueComp = BindingObject.HasProperty(name);
if (valueComp.IsAbrupt())
{
return(valueComp);
}
var value = valueComp.Other;
if (!value)
{
if (!strict)
{
return(Completion.NormalCompletion(UndefinedValue.Instance));
}
else
{
return(Completion.ThrowReferenceError($"No value {name} defined."));
}
}
return(BindingObject.Get(name));
}
public override Completion SetMutableBinding(string name, IValue value, bool strict)
{
if (!bindings.ContainsKey(name))
{
if (strict)
{
return(Completion.ThrowReferenceError($"binding {name} does not exist."));
}
CreateMutableBinding(name, true);
InitializeBinding(name, value);
return(Completion.NormalCompletion());
}
var binding = bindings[name];
if (binding.strict.GetValueOrDefault(false))
{
strict = true;
}
if (binding.Value == null)
{
return(Completion.ThrowReferenceError($"{name} has not been initialized yet."));
}
else if (binding.mutable)
{
binding.Value = value;
}
else
{
// attempt to change value of immutable binding
if (strict)
{
return(Completion.ThrowTypeError("attempt to change value of immutable binding"));
}
}
return(Completion.NormalCompletion());
}