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[Bugzilla#18786] make showMethods() display a syntactic name #179

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[Bugzilla#18786] make showMethods() display a syntactic name #179

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1 change: 1 addition & 0 deletions src/library/methods/R/show.R
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,7 @@ show <- function(object) showDefault(object)
nam %in% names(.getNamespaceInfo(ns, "exports"))
showGen <- if(exported) nam # was dQuote(nam, NULL)
else paste(pkg, nam, sep=":::")
if (make.names(showGen) != showGen) showGen <- paste0("`", showGen, "`")
cat("Methods may be defined for arguments: ",
paste0(object@signature, collapse=", "), "\n",
"Use showMethods(", showGen,
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3 changes: 3 additions & 0 deletions tests/reg-S4.R
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Expand Up @@ -888,3 +888,6 @@ setClass("foo")
sealClass("foo") # failed in R < 4.5.0
stopifnot(isSealedClass("foo"))
stopifnot(removeClass("foo"))

# show(<non-syntactic name>) should recommend backticks for showMethods()
stopifnot(any(grepl("showMethods(`body<-`)", capture.output(show(`body<-`)), fixed=TRUE)))
3 changes: 3 additions & 0 deletions tests/reg-S4.Rout.save
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Expand Up @@ -1187,3 +1187,6 @@ class(from) <- "foo"
> stopifnot(isSealedClass("foo"))
> stopifnot(removeClass("foo"))
>
> # show(<non-syntactic name>) should recommend backticks for showMethods()
> stopifnot(any(grepl("showMethods(`body<-`)", capture.output(show(`body<-`)), fixed=TRUE)))
>
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