should the text for RIGHT_ASSIGN be -> in getParseData()?
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.mes at cbs.dk Priv: PDalgd at gmail.com