On Sun, 28 Nov 2010, Duncan Murdoch wrote:
I've now committed changes in R-devel and R-patched to detect cases where a
call to switch() contains multiple unnamed alternatives. The code only
complains if the EXPR argument is a character string; unnamed alternatives
are fine with numeric switching.
Adding this check turned up 3 more typos like this in the base code besides
the one in parseNamespaceFile. I expect it will turn up quite a few more in
CRAN and Bioconductor packages.
Please let me know right away if you've got correct code that generates the
warnings or errors.
Most of the errors seem to be of the form (here from Brobdingnag)
trunc = callGeneric(as.complex(x)),,,
that is, empty arguments to switch.
Duncan Murdoch
In R-devel they're an error, in R-patched they'll just give a warning.
On 27/11/2010 7:09 PM, Duncan Murdoch wrote:
On 27/11/2010 6:50 PM, Duncan Murdoch wrote:
On 27/11/2010 5:58 PM, Charles C. Berry wrote:
parseNamespaceFile() doesn't seem to detect misspelled directives.
Looking
at its code I see
switch(as.character(e[[1L]]),
<lots of args omitted here>,
stop(gettextf("unknown namespace directive: %s",
deparse(e)), call. = FALSE, domain = NA))
but this doesn't seem to function as I expect, viz. to stop with an error
if I type a wrong directive.
You're right, there was a typo in parseNamespaceFile. (The typo was in
this line:
"=", "<-" = {
This should have been
"=" =, "<-" = {
Without the extra = sign, the "=" was taken as the default value of the
switch, and the stop() was never reached.
Conceivably switch() should complain if it is called with more than one
default.
I suspect when I fix this it's going to flush out some typos in packages
on CRAN...
Duncan Murdoch
Duncan Murdoch
Details:
# create dummy NAMESPACE file with two bad / one good directives
cat("blah( nada )\nblee( nil )\nexport( outDS )\n",file="NAMESPACE")
readLines("NAMESPACE")
[1] "blah( nada )" "blee( nil )" "export( outDS )"
parseNamespaceFile("",".") # now parse it
$imports
list()
$exports
[1] "outDS"
$exportPatterns
character(0)
$importClasses
list()
$importMethods
list()
$exportClasses
character(0)
$exportMethods
character(0)
$exportClassPatterns
character(0)
$dynlibs
character(0)
$nativeRoutines
list()
$S3methods
[,1] [,2] [,3]
So, it picked up 'export' and ignored the other two lines.
Chuck
p.s.
sessionInfo()
R version 2.12.0 (2010-10-15)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)
locale:
[1] C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Charles C. Berry Dept of Family/Preventive
Medicine
cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego
92093-0901
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
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