// Used for rewrite of the nodes to either reuse existing set of variables if not rewritten.
internal IList <ParameterExpression> ReuseOrValidateVariables(ReadOnlyCollection <ParameterExpression> variables)
{
if (variables != null && variables != VariablesList)
{
// Need to validate the new variables (uniqueness, not byref)
ExpressionEx.ValidateVariables(variables, "variables");
return(variables);
}
else
{
return(VariablesList);
}
}
internal override Expression GetExpression(int index)
{
switch (index)
{
case 0: return(ExpressionEx.ReturnObject <Expression>(_arg0));
case 1: return(_arg1);
case 2: return(_arg2);
default: throw new InvalidOperationException();
}
}
internal override ReadOnlyCollection <Expression> GetOrMakeExpressions()
{
return(ExpressionEx.ReturnReadOnly(ref _body));
}
internal Scope1(IList <ParameterExpression> variables, Expression body)
: base(variables, ExpressionEx.ReturnObject <Expression>(body).Type)
{
_body = body;
}
internal override ReadOnlyCollection <ParameterExpression> GetOrMakeVariables()
{
return(ExpressionEx.ReturnReadOnly(ref _variables));
}