86 lines
2.9 KiB
R
86 lines
2.9 KiB
R
#### Essential functionality needed by ESS
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## Should work on *all* vesions of R.
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## Do not use _ in names, nor :: , nor 1L etc, as they
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## cannot be parsed in old R versions
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## loading ESSR.rda might fail, so re-assign here:
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.ess.Rversion <-
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if( exists("getRversion", mode="function") ){
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getRversion()
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} else {
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paste(R.version$major, R.version$minor, sep=".")
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}
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.ess.R.has.utils <- (.ess.Rversion >= "1.9.0")
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.ess.utils.name <- paste("package",
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if(.ess.Rversion >= "1.9.0") "utils" else "base",
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sep = ":")
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## Instead of modern utils::help use one that works in R 1.0.0:
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.ess.findFUN <- get("find", .ess.utils.name)
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.ess.sourceFUN <- get("source", pos="package:base")
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.ess.helpFUN <- get("help", envir=.GlobalEnv)# so it also works with d..tools
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### HELP
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.ess.help <- function(..., help.type = getOption('help_type'))
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{
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if (.ess.Rversion > '2.10')# abbreviating 'help_type' on purpose:
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.ess.helpFUN(..., help = help.type)
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else # not using identical(), and working also for NULL:
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.ess.helpFUN(..., htmlhelp = (length(help.type) && help.type=='html'))
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}
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.ess.getHelpAliases <- function(){
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readrds <-
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if(.ess.Rversion >= '2.13.0') readRDS
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else .readRDS
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rds.files <- paste(searchpaths(), "/help/aliases.rds", sep = "")
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unlist(lapply(rds.files,
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function(f){
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if( file.exists(f) )
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try(names(readrds(f)))
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}),
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use.names = FALSE)
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}
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### SOURCING
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.ess.eval <- function(string, echo = TRUE, print.eval = TRUE,
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max.deparse.length = 300,
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file = tempfile("ESS"),
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local = if (.ess.Rversion > '2.13') parent.frame() else FALSE)
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{
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## create FILE, put string into it. Then source.
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## arguments are like in source and .ess.source
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cat(string, file = file)
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on.exit(file.remove(file))
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.ess.source(file, echo = echo, print.eval = print.eval,
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max.deparse.length = max.deparse.length, local = local)
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}
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.ess.source <- function(file, echo = TRUE, print.eval = TRUE,
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max.deparse.length = 300,
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local = if (.ess.Rversion > '2.13') parent.frame() else FALSE)
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{
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ss <- # drop 'keep.source' for older versions
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if(.ess.Rversion >= "2.8") .ess.sourceFUN
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else function(..., keep.source) .ess.sourceFUN(...)
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invisible(ss(file, echo = echo, local = local, print.eval = print.eval,
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max.deparse.length = max.deparse.length,
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keep.source = TRUE)$value) ## return value for org-babel
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}
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if(.ess.Rversion < "1.8")
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## (works for "1.7.2"): bquote() was new in 1.8.0
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bquote <- function(expr, where=parent.frame()){
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unquote <- function(e)
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if (is.pairlist(e)) as.pairlist(lapply(e, unquote))
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else if (length(e) <= 1) e
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else if (e[[1]] == as.name(".")) eval(e[[2]], where)
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else as.call(lapply(e, unquote))
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unquote(substitute(expr))
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}
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