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#' Is a line in knitr R or not?
#'
#' @param lines Lines to check, as in the result of \code{readLines}. Not a filename.
#' @return \code{TRUE} if in knitr chunk (including boundaries). \code{FALSE} otherwise.
#' @export
isR_line_in_knitr <- function(lines){
starts <- grepl("^<<(.*)>>=\\s*$", lines, perl = TRUE)
stops <- grepl("^\\s*@\\s*(%+.*|)$", lines, perl = TRUE)
as.logical(cumsum(starts - stops))
}
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