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utils.R
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utils.R
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`%||%` <- function(x, y) if (is.null(x)) y else x
traceback_enabled <- function() {
# if there is specific option set then respect it
reticulate_traceback_option <- getOption("reticulate.traceback", default = NULL)
if (!is.null(reticulate_traceback_option))
return(isTRUE(reticulate_traceback_option))
# determine whether rstudio python traceback support is available
# and whether rstudio tracebacks are currently enabled
rstudio_has_python_tracebacks <- exists(".rs.getActivePythonStackTrace",
mode = "function")
if (rstudio_has_python_tracebacks) {
error_option_code <- deparse(getOption("error"))
error_option_code_has <- function(pattern) {
any(grepl(pattern, error_option_code))
}
rstudio_traceback_enabled <- error_option_code_has("\\.rs\\.recordTraceback")
# if it is then we disable tracebacks
if (rstudio_traceback_enabled)
return(FALSE)
}
# default to tracebacks enabled
TRUE
}
clear_error_handler <- function(retvalue = NA) {
function(e) {
py_clear_last_error()
if (!is.null(retvalue) && is.na(retvalue))
e
else
retvalue
}
}
as_r_value <- function(x) {
if (inherits(x, "python.builtin.object"))
py_to_r(x)
else
x
}
yoink <- function(package, symbol) {
do.call(":::", list(package, symbol))
}
defer <- function(expr, envir = parent.frame()) {
call <- substitute(
evalq(expr, envir = envir),
list(expr = substitute(expr), envir = parent.frame())
)
do.call(base::on.exit, list(substitute(call), add = TRUE), envir = envir)
}
#' @importFrom utils head
disable_conversion_scope <- function(object) {
if (!inherits(object, "python.builtin.object"))
return(FALSE)
envir <- as.environment(object)
if (exists("convert", envir = envir, inherits = FALSE)) {
convert <- get("convert", envir = envir)
assign("convert", FALSE, envir = envir)
defer(assign("convert", convert, envir = envir), envir = parent.frame())
}
TRUE
}
new_stack <- function() {
(function() {
.data <- list()
methods <- list(
clear = function() { .data <<- character() },
data = function() { .data },
empty = function() { length(.data) == 0 },
length = function() { length(.data) },
push = function(line) { .data[[length(.data) + 1]] <<- line },
peek = function() { .data[[length(.data)]] },
pop = function() { .data <<- utils::head(.data, n = -1) },
set = function(data) { .data <<- data }
)
list2env(methods)
})()
}
py_compile_eval <- function(code, compile_mode = "single", capture = TRUE) {
builtins <- import_builtins(convert = TRUE)
sys <- import("sys", convert = TRUE)
# allow 'globals' and 'locals' to both point at main module, so that
# evaluated code updates references there as well
globals <- py_eval("globals()", convert = FALSE)
locals <- globals
# Python's command compiler complains if the only thing you submit
# is a comment, so detect that case first
if (grepl("^\\s*#", code))
return(TRUE)
# Python is picky about trailing whitespace, so ensure only a single
# newline follows the code to be submitted
code <- sub("\\s*$", "\n", code)
# compile and eval the code -- use 'single' to auto-print statements
# as they are evaluated, or 'exec' to avoid auto-print
compiled <- builtins$compile(code, '<string>', compile_mode)
if (capture) {
output <- py_capture_output(builtins$eval(compiled, globals, locals))
} else {
builtins$eval(compiled, globals, locals)
output <- NULL
}
# save the value that was produced
.globals$py_last_value <- py_last_value()
# py_capture_output can append an extra trailing newline, so remove it
if (!is.null(output) && grepl("\n{2,}$", output))
output <- sub("\n$", "", output)
# and return
invisible(output)
}
py_last_value <- function() {
tryCatch(
py_eval("_", convert = FALSE),
error = function(e) r_to_py(NULL)
)
}
python_binary_path <- function(dir) {
# check for condaenv
if (is_condaenv(dir)) {
suffix <- if (is_windows()) "python.exe" else "bin/python"
return(file.path(dir, suffix))
}
# check for virtualenv
if (is_virtualenv(dir)) {
suffix <- if (is_windows()) "Scripts/python.exe" else "bin/python"
return(file.path(dir, suffix))
}
# check for directory containing Python
suffix <- if (is_windows()) "python.exe" else "python"
if (file.exists(file.path(dir, suffix)))
return(file.path(dir, suffix))
stop("failed to discover Python binary associated with path '", dir, "'")
}
# prepends entries to the PATH (either moving or adding them as appropriate)
# and returns the previously-set PATH
path_prepend <- function(entries) {
oldpath <- Sys.getenv("PATH")
if (length(entries)) {
entries <- path.expand(entries)
splat <- strsplit(oldpath, split = .Platform$path.sep, fixed = TRUE)[[1]]
newpath <- c(entries, setdiff(splat, entries))
Sys.setenv(PATH = paste(newpath, collapse = .Platform$path.sep))
}
oldpath
}
# note: normally, we'd like to compare paths with normalizePath() but
# that does not normalize for case on Windows by default so we fall back
# to a heuristic (note: false positives are possible but we can accept
# those in the contexts where this function is used)
file_same <- function(lhs, rhs) {
# check if paths are identical as-is
if (identical(lhs, rhs))
return(TRUE)
# check if paths are identical after normalization
lhs <- normalizePath(lhs, winslash = "/", mustWork = FALSE)
rhs <- normalizePath(rhs, winslash = "/", mustWork = FALSE)
if (identical(lhs, rhs))
return(TRUE)
# check if file info is the same
lhsi <- c(file.info(lhs, extra_cols = FALSE))
rhsi <- c(file.info(rhs, extra_cols = FALSE))
fields <- c("size", "isdir", "mode", "mtime", "ctime")
if (identical(lhsi[fields], rhsi[fields]))
return(TRUE)
# checks failed; return FALSE
FALSE
}
# normalize a path without following symlinks
canonical_path <- function(path) {
# on windows we normalize the whole path to avoid
# short path components leaking in
if (is_windows()) {
normalizePath(path, winslash = "/", mustWork = FALSE)
} else {
file.path(
normalizePath(dirname(path), winslash = "/", mustWork = FALSE),
basename(path)
)
}
}
enumerate <- function(x, f, ...) {
n <- names(x)
lapply(seq_along(x), function(i) {
f(n[[i]], x[[i]], ...)
})
}
is_interactive <- function() {
# detect case where RStudio is being used, but reticulate is being
# executed as part of a user's .Rprofile (for example). in this case,
# we aren't really interactive as we are unable to respond to readline
# requests, and so we want to avoid miniconda prompts
rstudio <- !is.na(Sys.getenv("RSTUDIO", unset = NA))
gui <- .Platform$GUI
if (rstudio && !identical(gui, "RStudio"))
return(FALSE)
# otherwise, use base implementation
interactive()
}