| Hao Zhu | 96a50b5 | 2017-06-14 18:09:35 -0400 | [diff] [blame^] | 1 | #' Add a header column |
| 2 | #' |
| 3 | #' @description Experimenting. Please don't use it in production |
| 4 | #' |
| 5 | #' @export |
| 6 | add_header_left <- function(kable_input, header = NULL, header_name = "") { |
| 7 | if (is.null(header)) return(kable_input) |
| 8 | kable_format <- attr(kable_input, "format") |
| 9 | if (!kable_format %in% c("html", "latex")) { |
| 10 | stop("Please specify output format in your kable function. Currently ", |
| 11 | "generic markdown table using pandoc is not supported.") |
| 12 | } |
| 13 | if (kable_format == "html") { |
| 14 | return(add_header_left_html(kable_input, header, header_name)) |
| 15 | } |
| 16 | if (kable_format == "latex") { |
| 17 | return(add_header_left_latex(kable_input, header, header_name)) |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | # HTML |
| 22 | add_header_left_html <- function(kable_input, header, header_name) { |
| 23 | kable_attrs <- attributes(kable_input) |
| 24 | kable_xml <- read_xml(as.character(kable_input), options = "COMPACT") |
| 25 | kable_thead <- xml_tpart(kable_xml, "thead") |
| 26 | kable_tbody <- xml_tpart(kable_xml, "tbody") |
| 27 | |
| 28 | new_header <- paste0( |
| 29 | '<th style="text-align:center;" rowspan="', |
| 30 | length(xml_children(kable_thead)), '">', header_name, '</th>' |
| 31 | ) |
| 32 | new_header <- read_xml(new_header, options = c("COMPACT")) |
| 33 | xml_add_child(xml_child(kable_thead, 1), new_header, .where = 0) |
| 34 | |
| 35 | header <- standardize_rowheader_input(header, length(xml_children(kable_tbody))) |
| 36 | for (i in 1:nrow(header)) { |
| 37 | new_row_item <- paste0( |
| 38 | '<td style="text-align:center; vertical-align: middle;" rowspan="', |
| 39 | header$rowspan[i], '">', header$header[i], '</td>') |
| 40 | new_row_item <- read_xml(new_row_item, options = "COMPACT") |
| 41 | target_row <- xml_child(kable_tbody, header$row[i]) |
| 42 | xml_add_child(target_row, new_row_item, .where = 0) |
| 43 | } |
| 44 | |
| 45 | out <- structure(as.character(kable_xml), format = "html", |
| 46 | class = "knitr_kable") |
| 47 | attributes(out) <- kable_attrs |
| 48 | return(out) |
| 49 | } |
| 50 | |
| 51 | standardize_rowheader_input <- function(header, n_row) { |
| 52 | header_names <- names(header) |
| 53 | |
| 54 | if (is.null(header_names)) { |
| 55 | return(data.frame(header = header, row = 1:length(header), |
| 56 | rowspan = 1, row.names = NULL)) |
| 57 | } |
| 58 | |
| 59 | names(header)[header_names == ""] <- header[header_names == ""] |
| 60 | header[header_names == ""] <- 1 |
| 61 | header_names <- names(header) |
| 62 | header <- as.numeric(header) |
| 63 | names(header) <- header_names |
| 64 | if (sum(header) < n_row) { |
| 65 | header <- c(header, " " = n_row - sum(header)) |
| 66 | } |
| 67 | row_pos <- c(1, cumsum(header)[-length(header)] + 1) |
| 68 | return(data.frame( |
| 69 | header = names(header), |
| 70 | row = row_pos, rowspan = header, row.names = NULL |
| 71 | )) |
| 72 | } |
| 73 | |
| 74 | add_header_left_latex <- function(kable_input, header, header_name) { |
| 75 | return(kable_input) |
| 76 | } |