public IJsValue Evaluate(IEnvironment environment)
{
// TODO: Throw on cast failure
var inspected = Inspected.Evaluate(environment) as IJsObject;
if (inspected == null)
{
// Note: 'for (var m in undefined)' and 'for (var m in null)' is allowed...
return JsUndefined.Value;
}
var propertyNames = (inspected.GetProperties()
.Where(pd => pd.Enumerable)
.Select(pd => pd.Name)
.Distinct())
.ToList();
var bindingName = ((IAstWithName) Binding).Name;
var bindingEnvironment = environment;
if (DeclareBinding)
{
bindingEnvironment = new Environment(environment);
bindingEnvironment.CreateReference(bindingName, JsUndefined.Value);
}
foreach (var propertyName in propertyNames)
{
bindingEnvironment.GetReference(bindingName).SetValue(null, environment.CreateString(propertyName));
Block.Evaluate(bindingEnvironment);
if (bindingEnvironment.ControlFlow.Break)
{
break;
}
if (bindingEnvironment.ControlFlow.Return)
{
break;
}
}
return JsUndefined.Value;
}
public override IJsValue Apply(IJsValue @this, IList<IJsValue> arguments)
{
if (Body == null)
{
return JsUndefined.Value;
}
var applyEnvironment =
new Environment(
new BoundArgumentsEnvironment(
new FunctionEnvironment(Environment,
this,
@this,
arguments),
Arguments,
arguments
)
);
return Body.Evaluate(applyEnvironment);
}