[R] Completion for proto objects

[Gabor Grothendieck]

You might check the bugs section on the proto home page
and if any of those seem to apply try the devel version of
proto (or the workaround mentioned) as all known bugs are fixed
in the devel version.  If that does not help let me know offline
and I will try to help you.

See: http://r-proto.googlecode.com

On Fri, Sep 11, 2009 at 12:39 PM, Vitalie S. <vitosmail at rambler.ru> wrote:
> On Fri, 11 Sep 2009 16:07:45 +0200, Gabor Grothendieck
> <ggrothendieck at gmail.com> wrote:
>
>> See ?assignInNamespace
>>
>
> thanks for the hint. It works to some extent. Functions are redefined in
> "base" but utils:::specialCompletions seems not to preform properly:
>
> ls.proto <- function(x){  # function to complete
>    .local <- function(x){
>        if(is(x[[".super"]], "proto")) c(ls.default(x),
> Recall(x[[".super"]]))
>        else ls.default(x)
>    }
>    unlist(.local(x))
> }
>
> ls1 <- base::ls # cache ls
>
> ls.default1 <- function(name, pos = -1, envir = as.environment(pos),
> all.names = FALSE,     pattern){
>    UseMethod("ls")
> }
>
> assignInNamespace("ls.default", ls1 , 'base')
> assignInNamespace("ls", ls.default1 , 'base')
> assignInNamespace("ls.proto", ls.proto , 'base')
>
> environment(ls) <- asNamespace('base')
> environment(ls.default) <- asNamespace('base')
> environment(ls.proto) <- asNamespace('base')
>
> p1 <- proto(p1_abc=123)
> p2 <- proto(.=p1, p2_abc=23423)
>
> ls(p2)
> [1] "p2_abc" "p1_abc"   #works fine !!!!
>>
>> ls(p1)
>
> [1] "p1_abc"
>>
>
> Completion for $ works fine with environments and everything else, but not
> with proto objects.
> also ls.str (which uses ls internally) gives an error.
>
>> ls.str(p1)
>
> Error in ls(name, envir = envir, all.names = all.names, pattern = pattern) :
>  argument "name" is missing, with no default
>>
>
> What is going on??  My ls.proto works nicely in global env but does not when
> called from attached packages?
> Would really appreciate if someone can enlighten me.
>
> Thanks a lot.
>
> PS: I also tried to modify utils:::specialCompletions directly, did not wok
> either - it's something wrong with ls.proto above :(.
>
>> On Fri, Sep 11, 2009 at 10:02 AM, Vitalie S. <vitosmail at rambler.ru> wrote:
>>>
>>> Hello everyone,
>>>
>>> I am trying to implement completion for proto objects. Proto extends
>>> environment in a hierarchical way. Thus completion should list all the
>>> names
>>> in all it's parent environments.
>>>
>>> For "normal" classes defining names.class would do the job, but
>>> completion
>>> for "environment" is  hard coded in utils:::specialCompletions by means
>>> of
>>> base::ls(). As result defining names.proto does not work.
>>>
>>> I tried to make "ls" generic and to do something like:
>>>
>>> environment(ls.default) <- asNamespace('utils')
>>> environment(ls) <- asNamespace('utils')
>>> environment(ls.proto) <- asNamespace('utils')
>>>
>>> That does not work either.
>>>
>>> Is there a way to make utils:::specialCompletions use my "ls" instead of
>>> "base::ls"??
>>>
>>> I know Deepayan Sarkar is working now on improving the completion system
>>> (potentially by introducing "completion" generic). That would definitely
>>> solve the problem. But for now, does a quick fix exist?
>>>
>>> Thanks a lot,
>>> Vitalie
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>
>
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