ess-s4.S

#### This is a dump of the S library used by S-mode with Version 4 of S.
#### (from John Chambers ??)

#### S-mode session functions.
#### assign(..., where=0) makes them last only for the current session.

### Martin Maechler:  see also ./ess-sp3.S
###		      which uses assign(.., wh=0) which seems better

".SmodeDump" <- function(x, name)
{
    ## dump function for S-mode
    assign(".SmodeTmp", options(error = dump.calls), where = 0, i = T)
    on.exit( {
        options(.SmodeTmp)
        remove(".SmodeTmp", where = 0)
    } )
    dump(x, file = name)
}
".SmodeLoad" <- function(x)
{
    ## skeleton of a dump.calls interface, enough to keep s-mode
    ## informed that an error took place.
    pseudo <- function()
        cat(get.message(), "Dumped\n", sep = "", file = "|stderr")
    ## source function for S-mode
    assign(".SmodeTmp", options(error = pseudo), where = 0, i = T)
    on.exit( {
        options(.SmodeTmp)
        remove(".SmodeTmp", where = 0)
    } )
    invisible(source(x))
}

".SmodeObs" <- function(where, pattern)
{
    if(pattern == "") objects(where) else objects(where, pattern)
}

".SmodePaths" <- function()
{
    ## the paths for the directories in the search list
    temp <- search()
    value <- character(length(temp))
    for(i in seq(along.with = temp)) {
        obj <- database.object(i)
        if(is.character(obj) && length(obj) == 1)
            value[[i]] <- obj
    }
    value
}

"smode.lvsave" <-
    c(".Last.value",
      ".SmodeDump", ".SmodeLoad", ".SmodeObs", ".SmodePaths",
      "smode.lvsave")