[Rd] autocompletion problem

[Herve Pages]

Hi Deepayan,

Deepayan Sarkar wrote:
> On 4/9/08, Herve Pages <hpages at fhcrc.org> wrote:
>> Hi,
>>
>>  Let's create the xxx object just to avoid confusion even if it's not necessary
>>  for reproducing the problem below:
>>
>>    xxx <- 8:3
>>
>>  If I start typing this:
>>
>>    max(xxx[
>>
>>  and now try to autocomplete with <TAB>, then I get the following error (and a warning):
>>
>>    > max(xxx[Error in grep(sprintf("^%s", makeRegexpSafe(text)), allArgs, value = TRUE) :
>>      invalid regular expression '^xxx['
>>    In addition: Warning message:
>>    In grep(sprintf("^%s", makeRegexpSafe(text)), allArgs, value = TRUE) :
>>      regcomp error:  'Invalid regular expression'
> 
> Thanks for the report, makeRegexpSafe was not escaping "[". Does the
> following workaround fix the problem (without introducing additional
> ones)?
> 
> assignInNamespace("makeRegexpSafe", ns = "utils", value = function(s)
> {
>     s <- gsub(".", "\\.", s, fixed = TRUE)
>     s <- gsub("?", "\\?", s, fixed = TRUE)
>     s <- gsub("[", "\\[", s, fixed = TRUE)
>     s <- gsub("]", "\\]", s, fixed = TRUE) # necessary?
>     s
> })

Yes this fixes the problem. Thanks!

BTW are there any plans to deal with backquoted symbols/names?
There are currently 2 problems with this:

   1. Completion will work and expand symbols or names that contain special
      characters but without backquoting them:

        xxx <- as.list(11:13)
        names(xxx) <- letters[1:3]
        names(xxx)[2] <- "2b"

        > xxx$<TAB><TAB>    # <TAB> stands for a hit on the Tab key
        xxx$2b  xxx$a   xxx$c
        > xxx$2b            # I hit 2, then <TAB> gives me the b

     Now if I hit <Enter>, of course I get:

        Error: unexpected numeric constant in "xxx$2"

   2. Completion of names after $ will not work if I've already backquoted
      the partial name:

        > xxx$`2<TAB><TAB><TAB>...  # nothing happens

Thanks!
H.


> 
> (with 2.6.x, replace "utils" with "rcompgen")
> 
> -Deepayan
>