On 01/09/2010 9:27 AM, Christophe Rhodes wrote:
Duncan Murdoch <murdoch.dun...@gmail.com> writes:> On 27/08/2010 7:52 AM, Christophe Rhodes wrote: >> Hi, >> >> Is there any way, from R code, to perform introspection as to where >> certain names acquired their values? > > There's the "keep.source" option to source() and the optional > "srcfile" argument to parse() that tell R to keep this information. > If you haven't changed the default > getOption("keep.source") from TRUE, then source will default to > keeping it, and you can find the original location of a function > definition for function f by looking in attr(body(f), "srcref"). See > ?srcref for the format; there aren't a lot of user-level utility > functions for working with this. Thanks. This is enough for my immediate purposes: supporting single-keystroke (M-.) jumping to source locations of functions. > For packages, the relevant option is "keep.source.pkgs" at the time > the package is installed. Thank you. Is there anything like a cross-referencing database within R? The functionality I'm looking for here is to be able to name a function, and come back with a list of functions (or srcrefs) where that name is used. (I realise that this is not in general possible; just the lexically-apparent cases would be enough).
There is no such database already built, but I imagine the functions in the codetools package could construct one.
Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
