Dear R-devel community,
There appears to be an inconsistency in R C API about the exceptions
that can be raised from C code.
Mapping of R C funs to corresponding R functions is as follows.
error -> stop
warning -> warning
REprintf -> message
Rprintf -> cat
Rprint/cat is of course not an exception, I listed it just for completeness.
The inconsistency I would like to report is about REprintf. It cannot
be caught by tryCatch(message). Warnings are errors are being caught
as expected.
Is there any chance to "fix"/"improve" REprintf so tryCatch(message)
can catch it?
So in the example below catch(Cmessage()) would behave consistently to
R's catch(message("a"))?
Regards,
Jan Gorecki
catch = function(expr) {
tryCatch(expr,
message=function(m) cat("caught message\n"),
warning=function(w) cat("caught warning\n"),
error=function(e) cat("caught error\n")
)
}
library(inline)
Cstop = cfunction(c(), 'error("%s\\n","a"); return R_NilValue;')
Cwarning = cfunction(c(), 'warning("%s\\n","a"); return R_NilValue;')
Cmessage = cfunction(c(), 'REprintf("%s\\n","a"); return R_NilValue;')
catch(stop("a"))
#caught error
catch(warning("a"))
#caught warning
catch(message("a"))
#caught message
catch(Cstop())
#caught error
catch(Cwarning())
#caught warning
catch(Cmessage())
#a
#NULL
REprintf could be caught by tryCatch(message)
5 messages · Jan Gorecki, Luke Tierney
On Sun, 15 Sep 2019, Jan Gorecki wrote:
Dear R-devel community, There appears to be an inconsistency in R C API about the exceptions that can be raised from C code. Mapping of R C funs to corresponding R functions is as follows. error -> stop warning -> warning REprintf -> message
This is wrong: REpintf is like cat with file = stderr(). If this claim is made somewhere in R documentation please report it a a bug.
Rprintf -> cat Rprint/cat is of course not an exception, I listed it just for completeness. The inconsistency I would like to report is about REprintf. It cannot be caught by tryCatch(message). Warnings are errors are being caught as expected. Is there any chance to "fix"/"improve" REprintf so tryCatch(message) can catch it?
No: this is behaving as intended. Best, luke
So in the example below catch(Cmessage()) would behave consistently to
R's catch(message("a"))?
Regards,
Jan Gorecki
catch = function(expr) {
tryCatch(expr,
message=function(m) cat("caught message\n"),
warning=function(w) cat("caught warning\n"),
error=function(e) cat("caught error\n")
)
}
library(inline)
Cstop = cfunction(c(), 'error("%s\\n","a"); return R_NilValue;')
Cwarning = cfunction(c(), 'warning("%s\\n","a"); return R_NilValue;')
Cmessage = cfunction(c(), 'REprintf("%s\\n","a"); return R_NilValue;')
catch(stop("a"))
#caught error
catch(warning("a"))
#caught warning
catch(message("a"))
#caught message
catch(Cstop())
#caught error
catch(Cwarning())
#caught warning
catch(Cmessage())
#a
#NULL
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
Thank you Luke for prompt reply. Is it possible then to request a new function to R C API "message" that would equivalent to R "message" function? Similarly as we now have C "warning" and C "error" functions. Best, Jan
On Sun, Sep 15, 2019 at 5:25 PM Tierney, Luke <luke-tierney at uiowa.edu> wrote:
On Sun, 15 Sep 2019, Jan Gorecki wrote:
Dear R-devel community, There appears to be an inconsistency in R C API about the exceptions that can be raised from C code. Mapping of R C funs to corresponding R functions is as follows. error -> stop warning -> warning REprintf -> message
This is wrong: REpintf is like cat with file = stderr(). If this claim is made somewhere in R documentation please report it a a bug.
Rprintf -> cat Rprint/cat is of course not an exception, I listed it just for completeness. The inconsistency I would like to report is about REprintf. It cannot be caught by tryCatch(message). Warnings are errors are being caught as expected. Is there any chance to "fix"/"improve" REprintf so tryCatch(message) can catch it?
No: this is behaving as intended. Best, luke
So in the example below catch(Cmessage()) would behave consistently to
R's catch(message("a"))?
Regards,
Jan Gorecki
catch = function(expr) {
tryCatch(expr,
message=function(m) cat("caught message\n"),
warning=function(w) cat("caught warning\n"),
error=function(e) cat("caught error\n")
)
}
library(inline)
Cstop = cfunction(c(), 'error("%s\\n","a"); return R_NilValue;')
Cwarning = cfunction(c(), 'warning("%s\\n","a"); return R_NilValue;')
Cmessage = cfunction(c(), 'REprintf("%s\\n","a"); return R_NilValue;')
catch(stop("a"))
#caught error
catch(warning("a"))
#caught warning
catch(message("a"))
#caught message
catch(Cstop())
#caught error
catch(Cwarning())
#caught warning
catch(Cmessage())
#a
#NULL
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
You can file it as a wishlist item in the bug trackign system. Without a compelling case or a complete and well tested patch or both I doubt it will rise to the top of anyone's priority list. Best, luke
On Sun, 15 Sep 2019, Jan Gorecki wrote:
Thank you Luke for prompt reply. Is it possible then to request a new function to R C API "message" that would equivalent to R "message" function? Similarly as we now have C "warning" and C "error" functions. Best, Jan On Sun, Sep 15, 2019 at 5:25 PM Tierney, Luke <luke-tierney at uiowa.edu> wrote:
On Sun, 15 Sep 2019, Jan Gorecki wrote:
Dear R-devel community, There appears to be an inconsistency in R C API about the exceptions that can be raised from C code. Mapping of R C funs to corresponding R functions is as follows. error -> stop warning -> warning REprintf -> message
This is wrong: REpintf is like cat with file = stderr(). If this claim is made somewhere in R documentation please report it a a bug.
Rprintf -> cat Rprint/cat is of course not an exception, I listed it just for completeness. The inconsistency I would like to report is about REprintf. It cannot be caught by tryCatch(message). Warnings are errors are being caught as expected. Is there any chance to "fix"/"improve" REprintf so tryCatch(message) can catch it?
No: this is behaving as intended. Best, luke
So in the example below catch(Cmessage()) would behave consistently to
R's catch(message("a"))?
Regards,
Jan Gorecki
catch = function(expr) {
tryCatch(expr,
message=function(m) cat("caught message\n"),
warning=function(w) cat("caught warning\n"),
error=function(e) cat("caught error\n")
)
}
library(inline)
Cstop = cfunction(c(), 'error("%s\\n","a"); return R_NilValue;')
Cwarning = cfunction(c(), 'warning("%s\\n","a"); return R_NilValue;')
Cmessage = cfunction(c(), 'REprintf("%s\\n","a"); return R_NilValue;')
catch(stop("a"))
#caught error
catch(warning("a"))
#caught warning
catch(message("a"))
#caught message
catch(Cstop())
#caught error
catch(Cwarning())
#caught warning
catch(Cmessage())
#a
#NULL
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
Thank you Luke, I filled https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17612 Best, Jan
On Mon, Sep 16, 2019 at 2:15 AM Tierney, Luke <luke-tierney at uiowa.edu> wrote:
You can file it as a wishlist item in the bug trackign system. Without a compelling case or a complete and well tested patch or both I doubt it will rise to the top of anyone's priority list. Best, luke On Sun, 15 Sep 2019, Jan Gorecki wrote:
Thank you Luke for prompt reply. Is it possible then to request a new function to R C API "message" that would equivalent to R "message" function? Similarly as we now have C "warning" and C "error" functions. Best, Jan On Sun, Sep 15, 2019 at 5:25 PM Tierney, Luke <luke-tierney at uiowa.edu> wrote:
On Sun, 15 Sep 2019, Jan Gorecki wrote:
Dear R-devel community, There appears to be an inconsistency in R C API about the exceptions that can be raised from C code. Mapping of R C funs to corresponding R functions is as follows. error -> stop warning -> warning REprintf -> message
This is wrong: REpintf is like cat with file = stderr(). If this claim is made somewhere in R documentation please report it a a bug.
Rprintf -> cat Rprint/cat is of course not an exception, I listed it just for completeness. The inconsistency I would like to report is about REprintf. It cannot be caught by tryCatch(message). Warnings are errors are being caught as expected. Is there any chance to "fix"/"improve" REprintf so tryCatch(message) can catch it?
No: this is behaving as intended. Best, luke
So in the example below catch(Cmessage()) would behave consistently to
R's catch(message("a"))?
Regards,
Jan Gorecki
catch = function(expr) {
tryCatch(expr,
message=function(m) cat("caught message\n"),
warning=function(w) cat("caught warning\n"),
error=function(e) cat("caught error\n")
)
}
library(inline)
Cstop = cfunction(c(), 'error("%s\\n","a"); return R_NilValue;')
Cwarning = cfunction(c(), 'warning("%s\\n","a"); return R_NilValue;')
Cmessage = cfunction(c(), 'REprintf("%s\\n","a"); return R_NilValue;')
catch(stop("a"))
#caught error
catch(warning("a"))
#caught warning
catch(message("a"))
#caught message
catch(Cstop())
#caught error
catch(Cwarning())
#caught warning
catch(Cmessage())
#a
#NULL
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tierney at uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu