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## Do *NOT* use 1L -- it gives parse errors in historical versions of R
## Try a setup working in as old R as possible.
## ===>
## 1) do not use "_" in names! --- seems impossible for the Millenials ..
## 2) use our own simplified definition of '::' and ':::' ?
##
if(!exists("local"))
local <- function(expr, envir = environment()) { invisible(eval(expr, envir=envir)) }
##' Robust version of
##' utils:::.addFunctionInfo(c = c("recursive", "use.names")) # needed only for R <= 3.y.z
local({
U <- asNamespace("utils"); fn <- ".addFunctionInfo"
EX <- exists(fn, envir=U)
if(EX && is.function(FN <- get(fn, envir=U))) {
FN(c = c("recursive", "use.names")); ##dbg: cat("Calling utils:::",fn,"(c = ...)\n")
}
})
.ess_eval <- function(str, env = globalenv()) {
## don't remove; really need eval(parse( here!!
tryCatch(eval(parse(text=str), envir = env),
error=function(e) NULL) ## also works for special objects containing @:$ etc
}
.ess_nonull <- function(x, default = "") {
if (is.null(x)) default
else x
}
## not needed for completion; called from (ess-r-xref--srcref *) in ../../../lisp/ess-r-xref.el
.ess_srcref <- function(name, pkg) {
if (!is.null(pkg) && requireNamespace(pkg)) {
env <- asNamespace(pkg)
} else {
env <- globalenv()
}
fn <- .ess_eval(name, env)
if (is.null(fn)) {
objs <- utils::getAnywhere(name)$objs
for (fn in objs) {
if(is.function(fn))
break
}
}
out <- "()\n"
if (is.function(fn) && !is.null(utils::getSrcref(fn))) {
file <- utils::getSrcFilename(fn, full.names = TRUE)
if (file != "") {
line <- .ess_nonull(utils::getSrcLocation(fn, "line" ), 1)
col <- .ess_nonull(utils::getSrcLocation(fn, "column"), 1)
out <- sprintf("(\"%s\" %d %d)\n", file, line, col - 1)
}
}
cat(out)
}
.ess_fn_pkg <- function(fn_name) {
objs <- utils::getAnywhere(fn_name)
print(sub("(package|namespace):", "", objs$where))
}
.ess_funargs <- function(funname) {
if(.ess.Rversion > '2.14.1') {
## temporarily disable JIT compilation and errors
comp <- compiler::enableJIT(0)
op <- options(error=NULL)
on.exit({ options(op); compiler::enableJIT(comp) })
}
fun <- .ess_eval(funname)
if(is.function(fun)) {
special <- grepl('[:$@[]', funname)
args <- if(!special){
fundef <- paste(funname, '.default',sep='')
do.call('argsAnywhere', list(fundef))
}
if(is.null(args))
args <- args(fun)
if(is.null(args))
args <- do.call('argsAnywhere', list(funname))
fmls <- formals(args)
fmls_names <- names(fmls)
fmls <- gsub('\"', '\\\"',
gsub("\\", "\\\\", as.character(fmls), fixed = TRUE),
fixed=TRUE)
args_alist <-
sprintf("'(%s)",
paste("(\"", fmls_names, "\" . \"", fmls, "\")",
sep = '', collapse = ' '))
allargs <-
if (special) fmls_names
else tryCatch(gsub(' ?= ?', '', utils:::functionArgs(funname, ''), fixed = FALSE),
error=function(e) NULL)
allargs <- sprintf("'(\"%s\")",
paste(allargs, collapse = '\" "'))
envname <-
if (is.primitive(fun)) "base"
else environmentName(environment(fun))
if (envname == "R_GlobalEnv") envname <- ""
cat(sprintf('(list \"%s\" %s %s)\n',
envname, args_alist, allargs))
}
}
.ess_get_completions <- function(string, end, suffix = " = ") {
oldopts <- utils::rc.options(funarg.suffix = suffix)
on.exit(utils::rc.options(oldopts))
sett <- utils::rc.settings
oldDots <- sett()[["dots"]]
on.exit(sett(dots=oldDots), add=TRUE)
sett(dots = FALSE)
if(.ess.Rversion > '2.14.1') {
comp <- compiler::enableJIT(0)
op <- options(error=NULL)
on.exit({ options(op); compiler::enableJIT(comp)}, add = TRUE)
}
utils:::.assignLinebuffer(string)
utils:::.assignEnd(end)
utils:::.guessTokenFromLine()
utils:::.completeToken()
c(get('token', envir=utils:::.CompletionEnv),
utils:::.retrieveCompletions())
}
.ess_arg_help <- function(arg, func) {
op <- options(error=NULL)
on.exit(options(op))
fguess <-
if(is.null(func)) get('fguess', envir=utils:::.CompletionEnv)
else func
findArgHelp <- function(fun, arg){
file <- help(fun, try.all.packages=FALSE)[[1]]
hlp <- utils:::.getHelpFile(file)
id <- grep('arguments', tools:::RdTags(hlp), fixed=TRUE)
if(length(id)){
arg_section <- hlp[[id[[1]]]]
items <- grep('item', tools:::RdTags(arg_section), fixed=TRUE)
## cat('items:', items, fill=TRUE)
if(length(items)){
arg_section <- arg_section[items]
args <- unlist(lapply(arg_section,
function(el) paste(unlist(el[[1]][[1]], TRUE, FALSE), collapse='')))
fits <- grep(arg, args, fixed=TRUE)
## cat('args', args, 'fits', fill=TRUE)
if(length(fits))
paste(unlist(arg_section[[fits[1]]][[2]], TRUE, FALSE), collapse='')
}
}
}
funcs <- c(fguess, tryCatch(methods(fguess),
warning= function(w) NULL,
error = function(e) NULL))
if(length(funcs) > 1 && length(pos <- grep('default', funcs))) {
funcs <- c(funcs[[pos[[1]]]], funcs[-pos[[1]]])
}
i <- 1; found <- FALSE
out <- 'No help found'
while(i <= length(funcs) && is.null(out <-
tryCatch(findArgHelp(funcs[[i]], arg),
warning=function(w) {NULL},
error=function(e) {NULL})
))
i <- i + 1
cat('\n\n', as.character(out), '\n')
}
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