# Output ------------------------------------------------------------------
# A simple object to represent rd escaped text.
rd <- function(x) {
structure(x, class = "rd")
}
#' @export
c.rd <- function(...) {
rd(NextMethod())
}
#' @export
print.rd <- function(x, ...) {
out <- paste0("<rd> ", x, collapse = "\n")
cat(out)
}
escape <- function(x) UseMethod("escape")
escape.rd <- function(x) x
escape.character <- function(x) {
# wrap_string uses \u{A0}, the unicode non-breaking space, which
# is not necessarily valid in windows locales. useBytes is a quick
# hack to fix the problem.
x1 <- gsub("\\", "\\\\", x, fixed = TRUE, useBytes = TRUE)
x2 <- gsub("%", "\\%", x1, fixed = TRUE, useBytes = TRUE)
rd(x2)
}
# Works like escape, but unescapes special rd example commands
escape_examples <- function(x) {
gsub("\\\\dont", "\\dont", escape(x))
}
# Works like paste, but automatically escapes all input variables,
# but not literal strings
build_rd <- function(..., collapse = NULL, sep = "") {
args <- dots(...)
env <- parent.frame()
escaped <- lapply(args, function(arg) {
if (is.character(arg)) return(arg)
escape(eval(arg, env))
})
string <- do.call("paste", c(escaped, list(collapse = collapse, sep = sep)))
rd(string)
}
dots <- function(...) {
eval(substitute(alist(...)))
}
# Translate a field and values into an Rd macro.
# Multiple values get their own braces.
rd_macro <- function(field, ..., space = FALSE) {
if (space) {
values <- paste0("\n", paste0(..., collapse = "\n"), "\n")
} else {
values <- str_trim(c(...))
}
paste0("\\", field, paste0("{", values, "}", collapse = ""))
}
# Input -------------------------------------------------------------------
get_rd <- function(topic, package = NULL) {
help_call <- substitute(help(t, p), list(t = topic, p = package))
top <- eval(help_call)
if (length(top) == 0) return(NULL)
internal_f("utils", ".getHelpFile")(top)
}
get_tags <- function(rd, tag) {
Filter(function(x) identical(attr(x, "Rd_tag"), tag), rd)
}
rd2text <- function(x) {
chr <- as.character(structure(x, class = "Rd"))
str <- paste(chr, collapse = "")
# re-escape comments
gsub("%", "\\%", str, fixed = TRUE)
}
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