R help - Feb 2015 - non-terminal token lacking children from utils::getParseData

Hi,

I have run across a source file for which the return value
of getParseData() includes a record having FALSE for $terminal, yet it is
not the parent of any other tokens. Before I spend time constructing a
reproducible example, I wanted to verify that this is in fact unexpected
behavior (under R 3.1.2)?

Thanks,
Ben

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On 19/02/2015 6:31 PM, B Tyner wrote:
> Hi,
> 
> I have run across a source file for which the return value
> of getParseData() includes a record having FALSE for $terminal, yet it is
> not the parent of any other tokens. Before I spend time constructing a
> reproducible example, I wanted to verify that this is in fact unexpected
> behavior (under R 3.1.2)?
Before I spend the time thinking about that, I'd like to see a
reproducible example.

Duncan Murdoch

I tried to reduce the offending portion as best I could to a
more-or-less minimal example (1136 bytes), which can be downloaded via:

    wget https://www.dropbox.com/s/74rgxr5x2aalr99/badstring.R

then once in R,

    > b <- parse(file = "~/badstring.R", keep.source = TRUE)
    > d <- getParseData(b, includeText = FALSE)
    > subset(d, line1 == 2L)
       line1 col1 line2 col2 id parent token terminal
    10     2    5    24    1 10     21  expr    FALSE
    > subset(d, parent == 10)
    [1] line1    col1     line2    col2     id       parent   token   
terminal
    <0 rows> (or 0-length row.names)
   
here is my

    > sessionInfo()
    R version 3.0.2 (2013-09-25)
    Platform: x86_64-pc-linux-gnu (64-bit)
   
    locale:
     [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C             
     [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8   
     [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8  
     [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                
     [9] LC_ADDRESS=C               LC_TELEPHONE=C           
    [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C      
   
    attached base packages:
    [1] stats     graphics  grDevices utils     datasets  methods   base

note that while it says R version 3.0.2 above, I have seen the same
behaviour under version 3.1.2 as well.

Regards
Ben

On 02/19/2015 06:34 PM, Duncan Murdoch wrote:
> On 19/02/2015 6:31 PM, B Tyner wrote:
>> Hi,
>>
>> I have run across a source file for which the return value
>> of getParseData() includes a record having FALSE for $terminal, yet it
is
>> not the parent of any other tokens. Before I spend time constructing a
>> reproducible example, I wanted to verify that this is in fact
unexpected
>> behavior (under R 3.1.2)?
> Before I spend the time thinking about that, I'd like to see a
> reproducible example.
>
> Duncan Murdoch
>
>