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#' Strip comments from LaTeX lines
#' @param lines Character vector of a LaTeX document.
#' @param retain.percent.symbol (logical, default: \code{TRUE}) Should the \verb{\%} symbol itself be stripped?
#' @return \code{lines} but with all text to the right of every unescaped \verb{\%} removed
#' @examples
#'
#' some_lines <- c("Text. % A comment", "20\\% of comments are % useful")
#' strip_comments(some_lines)
#' strip_comments(some_lines, retain.percent.symbol = FALSE)
#' @export strip_comments
strip_comments <- function(lines, retain.percent.symbol = TRUE) {
if (retain.percent.symbol) {
sub("(?<!(\\\\))[%].*$", "%", lines, perl = TRUE)
} else {
sub("(?<!(\\\\))[%].*$", "", lines, perl = TRUE)
}
}
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