On 11-09-01 8:47 PM, William Dunlap wrote:
The CRAN package svMisc misuses it, using "\8" instead of "\10" or "\b":
./svMisc/R/progress.R: backspaces<- paste(rep("\8", l3), collapse =
"")
I noticed it when S+ emitted a warning when parsing that file:
> p<- parse("svMisc/R/progress.R")
Warning messages:
The initial backslash is ignored in \8 -- not a recognized escape sequence.
Use \\ to make a backslash in: parse("svMisc/R/progress.R")
(S+ parses the "\8" as "8", as the warning obliquly implies.)
I grepped through other CRAN sources for "\\0*8" and also found
I don't have the CRAN sources installed here so I can't check myself,
but grepping for \\[0-7]*8 might find other instances. The parser would
accept an 8 in any position.
Duncan
./mvbutils/R/mvbutils.R: rep.percent<- '\008'
S+ emits no warning for that but parses it as "", because it
considers the octal escape to stop at the first non-octal digit.
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-----Original Message-----
From: Duncan Murdoch [mailto:murdoch.dun...@gmail.com]
Sent: Thursday, September 01, 2011 5:30 PM
To: William Dunlap
Cc: r-devel@r-project.org
Subject: Re: [Rd] "\088" is legal syntax?
On 11-09-01 5:43 PM, William Dunlap wrote:
Is it intentional that the digit 8 is allowed
in octal escape sequences in character literals?
> "\110" == "\088"
[1] TRUE
> "\8" == "\b"
[1] TRUE
9's are rejected, so I'd expected 8's to be illegal as well.
It is documented that way in the R-lang manual, but I imagine it's just
a thinko. It's been like that since octal escapes were added in 1998.
I wonder how much will break if I fix it?
Duncan Murdoch
> "\9"
Error: '\9' is an unrecognized escape in character string starting "\9"
> "\091")
Error: embedded nul in string: '\091'
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
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