| #' Add a header row on top of current header |
| #' |
| #' @description Tables with multiple rows of header rows are extremely useful |
| #' to demonstrate grouped data. This function takes the output of a `kable()` |
| #' function and adds an header row on top of it. |
| #' |
| #' @param kable_input Output of `knitr::kable()` with `format` specified |
| #' @param header A (named) character vector with `colspan` as values. For |
| #' example, `c(" " = 1, "title" = 2)` can be used to create a new header row |
| #' for a 3-column table with "title" spanning across column 2 and 3. For |
| #' convenience, when `colspan` equals to 1, users can drop the ` = 1` part. |
| #' As a result, `c(" ", "title" = 2)` is the same as `c(" " = 1, "title" = 2)`. |
| #' @param bold A T/F value to control whether the text should be bolded. |
| #' @param italic A T/F value to control whether the text should to be emphasized. |
| #' @param monospace A T/F value to control whether the text of the selected column |
| #' need to be monospaced (verbatim) |
| #' @param underline A T/F value to control whether the text of the selected row |
| #' need to be underlined |
| #' @param strikeout A T/F value to control whether the text of the selected row |
| #' need to be stricked out. |
| #' @param align A character string for cell alignment. For HTML, possible values could |
| #' be `l`, `c`, `r` plus `left`, `center`, `right`, `justify`, `initial` and `inherit` |
| #' while for LaTeX, you can only choose from `l`, `c` & `r`. |
| #' @param color A character string/vector for text color. Here please pay |
| #' attention to the differences in color codes between HTML and LaTeX. |
| #' @param background A character string/vector for background color. Here please |
| #' pay attention to the differences in color codes between HTML and LaTeX. Also |
| #' note that in HTML, background defined in cell_spec won't cover the whole |
| #' cell. |
| #' @param font_size A numeric input/vector for font size. For HTML, you can also use |
| #' options including `xx-small`, `x-small`, `small`, `medium`, `large`, |
| #' `x-large`, `xx-large`, `smaller`, `larger`, `initial` and `inherit`. |
| #' @param angle 0-360, degree that the text will rotate. |
| #' @param escape A T/F value showing whether special characters should be |
| #' escaped. |
| #' @param line A T/F value to control whether a line will appear underneath the |
| #' header |
| #' |
| #' @examples x <- knitr::kable(head(mtcars), "html") |
| #' # Add a row of header with 3 columns on the top of the table. The column |
| #' # span for the 2nd and 3rd one are 5 & 6. |
| #' add_header_above(x, c(" ", "Group 1" = 5, "Group 2" = 6)) |
| #' |
| #' @export |
| add_header_above <- function(kable_input, header = NULL, |
| bold = FALSE, italic = FALSE, monospace = FALSE, |
| underline = FALSE, strikeout = FALSE, |
| align = "c", color = NULL, background = NULL, |
| font_size = NULL, angle = NULL, |
| escape = TRUE, line = TRUE) { |
| kable_format <- attr(kable_input, "format") |
| if (!kable_format %in% c("html", "latex")) { |
| warning("Please specify format in kable. kableExtra can customize either ", |
| "HTML or LaTeX outputs. See https://haozhu233.github.io/kableExtra/ ", |
| "for details.") |
| return(kable_input) |
| } |
| if (kable_format == "html") { |
| return(htmlTable_add_header_above(kable_input, header, bold, italic, |
| monospace, underline, strikeout, |
| align, color, background, |
| font_size, angle, escape, line)) |
| } |
| if (kable_format == "latex") { |
| return(pdfTable_add_header_above(kable_input, header, bold, italic, |
| monospace, underline, strikeout, |
| align, color, background, |
| font_size, angle, escape, line)) |
| } |
| } |
| |
| # HTML |
| htmlTable_add_header_above <- function(kable_input, header, bold, italic, |
| monospace, underline, strikeout, |
| align, color, background, |
| font_size, angle, escape, line) { |
| if (is.null(header)) return(kable_input) |
| kable_attrs <- attributes(kable_input) |
| kable_xml <- read_kable_as_xml(kable_input) |
| kable_xml_thead <- xml_tpart(kable_xml, "thead") |
| |
| header <- standardize_header_input(header) |
| |
| if (escape) { |
| header$header <- escape_html(header$header) |
| } |
| |
| header_rows <- xml_children(kable_xml_thead) |
| bottom_header_row <- header_rows[[length(header_rows)]] |
| kable_ncol <- length(xml_children(bottom_header_row)) |
| if (sum(header$colspan) != kable_ncol) { |
| stop("The new header row you provided has a different total number of ", |
| "columns with the original kable output.") |
| } |
| |
| new_header_row <- htmlTable_new_header_generator( |
| header, bold, italic, monospace, underline, strikeout, align, line, |
| color, background, font_size, angle |
| ) |
| xml_add_child(kable_xml_thead, new_header_row, .where = 0) |
| out <- as_kable_xml(kable_xml) |
| if (is.null(kable_attrs$header_above)) { |
| kable_attrs$header_above <- 1 |
| } else { |
| kable_attrs$header_above <- kable_attrs$header_above + 1 |
| } |
| attributes(out) <- kable_attrs |
| if (!"kableExtra" %in% class(out)) class(out) <- c("kableExtra", class(out)) |
| return(out) |
| } |
| |
| standardize_header_input <- function(header) { |
| header_names <- names(header) |
| |
| if (is.null(header_names)) { |
| return(data.frame(header = header, colspan = 1, row.names = NULL)) |
| } |
| |
| names(header)[header_names == ""] <- header[header_names == ""] |
| header[header_names == ""] <- 1 |
| header_names <- names(header) |
| header <- as.numeric(header) |
| names(header) <- header_names |
| return(data.frame(header = names(header), colspan = header, row.names = NULL)) |
| } |
| |
| htmlTable_new_header_generator <- function(header_df, bold, italic, monospace, |
| underline, strikeout, align, line, |
| color, background, font_size, |
| angle) { |
| if (align %in% c("l", "c", "r")) { |
| align <- switch(align, r = "right", c = "center", l = "left") |
| } |
| row_style <- paste0( |
| paste0("text-align: ", align, "; "), |
| ifelse(bold, "font-weight: bold; ", ""), |
| ifelse(italic, "font-style: italic; ", ""), |
| ifelse(monospace, "font-family: monospace; ", ""), |
| ifelse(underline, "text-decoration: underline; ", ""), |
| ifelse(strikeout, "text-decoration: line-through; ", "") |
| ) |
| if (!is.null(color)) { |
| row_style <- paste0(row_style, "color: ", html_color(color), ";") |
| } |
| if (!is.null(background)) { |
| row_style <- paste0( |
| row_style, |
| "padding-right: 4px; padding-left: 4px; ", |
| "background-color: ", html_color(background), ";" |
| ) |
| } |
| if (!is.null(font_size)) { |
| if (is.numeric(font_size)) font_size <- paste0(font_size, "px") |
| row_style <- paste0(row_style, "font-size: ", font_size, ";") |
| } |
| if (!is.null(angle)) { |
| angle <- paste0("-webkit-transform: rotate(", angle, |
| "deg); -moz-transform: rotate(", angle, |
| "deg); -ms-transform: rotate(", angle, |
| "deg); -o-transform: rotate(", angle, |
| "deg); transform: rotate(", angle, |
| "deg); display: inline-block; ") |
| header_df$header <- ifelse( |
| trimws(header_df$header) == "", |
| header_df$header, |
| paste0('<span style="', angle, '">', header_df$header, '</span>') |
| ) |
| } |
| |
| line <- ifelse(ez_rep(line, nrow(header_df)), |
| "border-bottom: 1px solid #ddd; padding-bottom: 5px; ", "") |
| |
| header_items <- ifelse( |
| trimws(header_df$header) == "", |
| paste0('<th style="border-bottom:hidden" colspan="', header_df$colspan, |
| '"></th>'), |
| paste0( |
| '<th style="border-bottom:hidden; ', |
| 'padding-bottom:0; padding-left:3px;padding-right:3px;', |
| row_style, '" colspan="', |
| header_df$colspan, '"><div style="', line, '">', header_df$header, |
| '</div></th>') |
| ) |
| header_text <- paste(c("<tr>", header_items, "</tr>"), collapse = "") |
| header_xml <- read_xml(header_text, options = c("COMPACT")) |
| return(header_xml) |
| } |
| |
| # Add an extra header row above the current header in a LaTeX table ------ |
| pdfTable_add_header_above <- function(kable_input, header, bold, italic, |
| monospace, underline, strikeout, |
| align, color, background, |
| font_size, angle, escape, line) { |
| table_info <- magic_mirror(kable_input) |
| header <- standardize_header_input(header) |
| |
| if (escape) { |
| header$header <- input_escape(header$header, align) |
| } |
| |
| align <- match.arg(align, c("c", "l", "r")) |
| |
| hline_type <- switch(table_info$booktabs + 1, "\\\\hline", "\\\\toprule") |
| new_header_split <- pdfTable_new_header_generator( |
| header, table_info$booktabs, bold, italic, monospace, underline, strikeout, |
| align, color, background, font_size, angle) |
| if (line) { |
| new_header <- paste0(new_header_split[1], "\n", new_header_split[2]) |
| } else { |
| new_header <- new_header_split[1] |
| } |
| out <- str_replace(solve_enc(kable_input), |
| hline_type, |
| paste0(hline_type, "\n", new_header)) |
| out <- structure(out, format = "latex", class = "knitr_kable") |
| # new_header_row <- latex_contents_escape(new_header_split[1]) |
| if (is.null(table_info$new_header_row)) { |
| table_info$new_header_row <- new_header_split[1] |
| table_info$header_df <- list(header) |
| } else { |
| table_info$new_header_row <- c(table_info$new_header_row, new_header_split[1]) |
| table_info$header_df[[length(table_info$header_df) + 1]] <- header |
| } |
| attr(out, "kable_meta") <- table_info |
| return(out) |
| } |
| |
| ez_rep <- function(x, n) { |
| if (is.null(x)) return(NULL) |
| if (length(x) == 1) return(rep(x, n)) |
| return(x) |
| } |
| |
| pdfTable_new_header_generator <- function(header_df, booktabs = FALSE, |
| bold, italic, monospace, |
| underline, strikeout, align, |
| color, background, font_size, angle) { |
| n <- nrow(header_df) |
| bold <- ez_rep(bold, n) |
| italic <- ez_rep(italic, n) |
| monospace <- ez_rep(monospace, n) |
| underline <- ez_rep(underline, n) |
| strikeout <- ez_rep(strikeout, n) |
| align <- ez_rep(align, n) |
| color <- ez_rep(color, n) |
| background <- ez_rep(background, n) |
| font_size <- ez_rep(font_size, n) |
| angle <- ez_rep(angle, n) |
| if (!booktabs) { |
| align <- paste0("|", align, "|") |
| align[1] <- paste0(align[1], "|") |
| align[nrow(header_df)] <- paste0("|", align[nrow(header_df)]) |
| } |
| header <- header_df$header |
| colspan <- header_df$colspan |
| |
| header <- ifelse(bold, paste0('\\\\textbf\\{', header, '\\}'), header) |
| header <- ifelse(italic, paste0('\\\\em\\{', header, '\\}'), header) |
| header <- ifelse(monospace, paste0('\\\\ttfamily\\{', header, '\\}'), header) |
| header <- ifelse(underline, paste0('\\\\underline\\{', header, '\\}'), header) |
| header <- ifelse(strikeout, paste0('\\\\sout\\{', header, '\\}'), header) |
| if (!is.null(color)) { |
| color <- latex_color(color) |
| header <- paste0("\\\\textcolor", color, "\\{", header, "\\}") |
| } |
| if (!is.null(background)) { |
| background <- latex_color(background) |
| header <- paste0("\\\\cellcolor", background, "\\{", header, "\\}") |
| } |
| if (!is.null(font_size)) { |
| header <- paste0("\\\\bgroup\\\\fontsize\\{", font_size, "\\}\\{", |
| as.numeric(font_size) + 2, |
| "\\}\\\\selectfont ", header, "\\\\egroup\\{\\}") |
| } |
| if (!is.null(angle)) { |
| header <- paste0("\\\\rotatebox\\{", angle, "\\}\\{", header, "\\}") |
| } |
| header_items <- paste0( |
| '\\\\multicolumn\\{', colspan, '\\}\\{', align, '\\}\\{', header, '\\}' |
| ) |
| |
| header_text <- paste(paste(header_items, collapse = " & "), "\\\\\\\\") |
| cline <- cline_gen(header_df, booktabs) |
| return(c(header_text, cline)) |
| } |
| |
| cline_gen <- function(header_df, booktabs) { |
| cline_end <- cumsum(header_df$colspan) |
| cline_start <- c(0, cline_end) + 1 |
| cline_start <- cline_start[-length(cline_start)] |
| cline_type <- switch(booktabs + 1, |
| "\\\\cline{", |
| "\\\\cmidrule(l{2pt}r{2pt}){") |
| cline <- paste0(cline_type, cline_start, "-", cline_end, "}") |
| cline <- cline[trimws(header_df$header) != ""] |
| cline <- paste(cline, collapse = " ") |
| return(cline) |
| } |
| |
| |