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# wch/r-source

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 #### Produce an R test script -*- R -*- ## The logic here (BDR, 2003-02-02) is ## identify all is. and as. functions which might be thought of ## as precursors to is() and as(). Identify only generics. ## ## Then for a set of boundary-case inputs x, if as.foo(x) works ## check that is.foo(as.foo(x)) is true. ## Also check idempotency: as.foo(as.foo(x)) == as.foo(x) ## and that as.foo(x) == x iff is.foo(x) is true. ## ## One problem with the last is that no realistic x's are used. ## ls.base <- c(ls("package:base"), ls("package:stats")) base.is.f <- sapply(ls.base, function(x) is.function(get(x))) bi <- ls.base[base.is.f] iroot <- substring(is.bi <- bi[substring(bi,1,3) == "is."],4) ## is.single is a dummy iroot <- iroot[-match("single", iroot)] aroot <- substring(as.bi <- bi[substring(bi,1,3) == "as."],4) ## eliminate as.foo methods: there are no is.foo methods ## this works because data.frame.* has no other matches for data. aroot <- aroot[!duplicated(sub("\\..*", "", aroot))] (root <- intersect(iroot, aroot))# both an is.foo and as.foo function exist ex.list <- expression(integer(0), NULL, list(), 1:1, pi, "1.3", list(a=1), as.data.frame(character(0))) ##--- producing the real R script: sink("isas-tests.R") cat(".proctime00 <- proc.time()\n", "isall.equal <- function(x,y)", "typeof(x) == typeof(y) && is.logical(r <- all.equal(x,y, tol=0)) && r \n", sep="\n") cat("report <- function(x) {print(x); stopifnot(x)}\n") cat("options(error = expression(NULL))", "# don't stop on error in batch\n##~~~~~~~~~~~~~~\n") for(x in ex.list) { cat("\n###--------\n x <- ", deparse(x), "\n", sep="") ## is.foo(as.foo( bar )) #>> TRUE : for(r in root) { cat("res <- try(as.", r, "( x ), silent = TRUE)\n", sep="") cat("if(!inherits(res, 'try-error')) report(is.",r,"(res))\n", sep="") } cat("\n") ## if(is.foo(bar)) bar ``=='' as.foo(bar) : for(r in root) { cat("res <- try(as.", r, "( x ), silent = TRUE)\n", sep="") cat("if(!inherits(res, 'try-error'))\n report({if(is.",r,"(x)) { ", "cat('IS: ');all.equal(x, res, tol=0)\n", " } else !isall.equal(x, res)})\n", sep="") } ## f <- as.foo(x) ==> as.foo(f) == f : for(r in aroot) cat("f <- try(as.",r,"( x ), silent = TRUE)\n if(!inherits(f, 'try-error')) report(identical(f, as.",r,"( f )))\n", sep="") } cat("cat('Time elapsed: ', proc.time() - .proctime00,'\\n')\n")
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