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###########################################################################/**
# @RdocDefault findSourceTraceback
#
# @title "Finds all 'srcfile' objects generated by source() in all call frames"
#
# @synopsis
#
# \description{
# @get "title". This makes it possible to find out which files are
# currently scripted by @see "base::source".
# }
#
# \arguments{
# \item{...}{Not used.}
# }
#
# \value{
# Returns a named list of @see "base::srcfile" objects and/or
# @character strings.
# The names of the list entries corresponds to the 'filename'
# value of each corresponding 'srcfile' object.
# The returned list is empty if @see "base::source" was not called.
# }
#
# @examples "../incl/findSourceTraceback.Rex"
#
# @author
#
# \seealso{
# See also @see "utils::sourceutils".
# }
#
# @keyword IO
# @keyword programming
#*/###########################################################################
setMethodS3("findSourceTraceback", "default", function(...) {
# Identify the environment/frame of interest by making sure
# it at least contains all the arguments of source().
argsToFind <- names(formals(base::source))
# Scan the call frames/environments backwards...
srcfileList <- list()
for (ff in sys.nframe():0) {
env <- sys.frame(ff)
# Does the environment look like a source() environment?
exist <- sapply(argsToFind, FUN=exists, envir=env, inherits=FALSE)
if (!all(exist)) {
# Nope, then skip to the next one
next
}
# Identity the source file
if (exists("srcfile", envir=env, inherits=FALSE)) {
srcfile <- get("srcfile", envir=env, inherits=FALSE)
} else {
## AD HOC: Needed when for instance 'XML' is attached
srcfile <- get("srcfile", envir=env, inherits=TRUE)
## Failed?
if (!inherits(srcfile, "srcfile")) srcfile <- NULL
}
if (!is.null(srcfile)) {
if (!is.function(srcfile)) {
srcfileList <- c(srcfileList, list(srcfile))
}
}
} # for (ff ...)
# Extract the pathnames to the files called
pathnames <- sapply(srcfileList, FUN=function(srcfile) {
if (inherits(srcfile, "srcfile")) {
pathname <- srcfile$filename
} else if (is.environment(srcfile)) {
pathname <- srcfile$filename
} else if (is.character(srcfile)) {
# Occurs with source(..., keep.source=FALSE)
pathname <- srcfile
} else {
pathname <- NA_character_
warning("Unknown class of 'srcfile': ", class(srcfile)[1L])
}
pathname
})
names(srcfileList) <- pathnames
srcfileList
}) # findSourceTraceback()
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