Пример #1
0
        }         // func MemberGetSandbox

        private static Expression MemberGetExpressionCore(Lua lua, Token tokenStart, Expression instance, string memberName)
        {
            // if this is a dynamic type, let the type deside what is to do
            if (LuaEmit.IsDynamicType(instance.Type))
            {
                return(DynamicExpression.Dynamic(lua.GetGetMemberBinder(memberName), typeof(object), ConvertObjectExpression(lua, tokenStart, instance, true)));
            }
            else
            {
                Expression result;
                switch (LuaEmit.TryGetMember(instance, instance.Type, memberName, false, out result))
                {
                case LuaTryGetMemberReturn.None:
                    throw ParseError(tokenStart, LuaEmitException.GetMessageText(LuaEmitException.MemberNotFound, instance.Type.Name, memberName));

                case LuaTryGetMemberReturn.NotReadable:
                    throw ParseError(tokenStart, LuaEmitException.GetMessageText(LuaEmitException.CanNotReadMember, instance.Type.Name, memberName));

                case LuaTryGetMemberReturn.ValidExpression:
                    return(result);

                default:
                    throw new ArgumentException("Internal return type of TryGetMember");
                }
            }
        }         // func MemberGetExpressionCore
Пример #2
0
            } // ctor

            public override DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
            {
                // defer the target, to get the type
                if (!target.HasValue)
                {
                    return(Defer(target));
                }

                if (target.Value == null) // no value for target, finish binding with an error or the suggestion
                {
                    return(errorSuggestion ??
                           new DynamicMetaObject(
                               ThrowExpression(Resources.rsNullReference, ReturnType),
                               target.Restrictions.Merge(BindingRestrictions.GetInstanceRestriction(target.Expression, null))
                               ));
                }
                else
                {
                    Expression expr;

                    // restrictions
                    var restrictions = target.Restrictions.Merge(BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType));

                    // try to bind the member
                    switch (LuaEmit.TryGetMember(target.Expression, target.LimitType, Name, IgnoreCase, out expr))
                    {
                    case LuaTryGetMemberReturn.None:
                        return(errorSuggestion ?? new DynamicMetaObject(Expression.Default(ReturnType), restrictions));

                    case LuaTryGetMemberReturn.NotReadable:
                        return(errorSuggestion ?? new DynamicMetaObject(ThrowExpression(LuaEmitException.GetMessageText(LuaEmitException.CanNotReadMember, target.LimitType.Name, Name), ReturnType), restrictions));

                    case LuaTryGetMemberReturn.ValidExpression:
                        return(new DynamicMetaObject(Lua.EnsureType(expr, ReturnType), restrictions));

                    default:
                        throw new ArgumentException("return of TryGetMember.");
                    }
                }
            } // func FallbackGetMember