public Value Evaluate(Environment environment)
{
var value = expression.Evaluate(environment);
if (value.IsList() || value.IsSet())
{
var list = value.AsList().GetValue();
Value result = ValueNull.NULL;
for (var i = 0; i < identifiers.Count; i++)
{
if (!environment.IsDefined(identifiers[i]))
{
throw new ControlErrorException(new ValueString("ERROR"), "Variable '" + identifiers[i] + "' is not defined", pos);
}
if (i < list.Count)
{
environment.Set(identifiers[i], list[i]);
result = list[i];
}
else
{
environment.Set(identifiers[i], ValueNull.NULL);
result = ValueNull.NULL;
}
}
return(result);
}
throw new ControlErrorException(new ValueString("ERROR"), "Destructuring assign expected list or set but got " + value.Type(), pos);
}
public Value Evaluate(Environment environment)
{
if (!environment.IsDefined(identifier))
{
throw new ControlErrorException(new ValueString("ERROR"), "Variable '" + identifier + "' is not defined", pos);
}
environment.Set(identifier, expression.Evaluate(environment));
return(environment.Get(identifier, pos));
}