On Jul 5, 2013, at 13:29 , Duncan Murdoch wrote: > On 13-07-05 3:31 AM, Yihui Xie wrote: >> Hi, >> >> The text column for '->' becomes '<-' in the data frame returned by >> getParseData(): >> >>> getParseData(parse(text='1->x')) >> line1 col1 line2 col2 id parent token terminal text >> 7 1 1 1 4 7 0 expr FALSE >> 1 1 1 1 1 1 2 NUM_CONST TRUE 1 >> 2 1 1 1 1 2 7 expr FALSE >> 3 1 2 1 3 3 7 RIGHT_ASSIGN TRUE <- >> 4 1 4 1 4 4 6 SYMBOL TRUE x >> 6 1 4 1 4 6 7 expr FALSE >> >> Is that expected? > > It's by design, but I agree it's not ideal. The reason for it is that "1 -> > x" is parsed as `<-`(x, 1). I think the parser only does translations like > this for -> and ->>. Currently the parser shows the name of the binary > operator as the text. > > I'll look into adding special handling for translations like this. We will > still parse the assignment in the same way, but the getParseData text could > be the true text.
Just watch out for potential complications, e.g. > `->`(x,1) Error: could not find function "->" so one needs to be sure that nothing will assume that the text column is a function name. -- Peter Dalgaard, Professor Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
