On 19/09/2016 7:59 AM, Adrian Dușa wrote:
On Sun, Sep 18, 2016 at 12:34 AM, Peter Langfelder < peter.langfel...@gmail.com> wrote:> On Sat, Sep 17, 2016 at 2:12 PM, David Winsemius <dwinsem...@comcast.net> > wrote: > > Not entirely clear. If you were intending to just get character output > then you could just use: > > > > strsplit(txt, ";") > > You would want to avoid splitting within character strings > (print(";")) and in comments (print(2); ls() # This prints 2; then > lists...) The comment char could also appear in a character string, > where it does not mean the start of a comment... Yes, that would be the problem. Returning to my original post, modifying the example: x <- "print(2); bar <- \"don't ; use semicolons\"; foo <- '3;4'; ls(" This should result in a character vector of length 4: [1] "print(2)" "bar <- \"don't ; use semicolons\"" [3] "foo <- '3;4'" "ls(" even though the last command would cause an error using parse(text = x) Perhaps this is not that important (I am trying to simulate a normal R console), and parse only if it syntactically correct. I was merely curious if this could be done, likely using regular expressions (surely strsplit doesn't solve it). Best, Adrian
See the section on "partial parsing" in the ?parse help page. Duncan Murdoch ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
