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latex.R
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latex.R
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# LaTeX printing -----------------------------------------------------------------------------------
#' @import assertthat
NULL
default_table_width_unit <- "\\textwidth"
#' @export
#' @rdname to_latex
print_latex <- function (ht, ...) {
cat(to_latex(ht, ...))
}
#' Create LaTeX representing a huxtable
#'
#' @param ht A huxtable.
#' @param tabular_only Return only the LaTeX tabular, not the surrounding float.
#' @param ... Arguments to pass to methods.
#'
#' @details
#' If we appear to be in a rmarkdown document with the Pandoc markdown `+raw_attribute` extension
#' available, `to_latex` will return LaTeX surrounded by a "raw attribute code block" (see
#' https://pandoc.org/MANUAL.html#extension-raw_attribute). This helps protect against pandoc
#' accidentally escaping the TeX code.
#'
#' @return `to_latex` returns a string. `print_latex` prints the string and returns `NULL`.
#' @export
#'
#' @family printing functions
#'
#' @examples
#' ht <- huxtable(
#' a = 1:3,
#' b = letters[1:3]
#' )
#' print_latex(ht)
to_latex <- function (ht, ...) UseMethod("to_latex")
#' @export
#' @rdname to_latex
to_latex.huxtable <- function (ht, tabular_only = FALSE, ...){
assert_that(is.flag(tabular_only))
tabular <- build_tabular(ht)
commands <- "
\\providecommand{\\huxb}[2]{\\arrayrulecolor[RGB]{#1}\\global\\arrayrulewidth=#2pt}
\\providecommand{\\huxvb}[2]{\\color[RGB]{#1}\\vrule width #2pt}
\\providecommand{\\huxtpad}[1]{\\rule{0pt}{#1}}
\\providecommand{\\huxbpad}[1]{\\rule[-#1]{0pt}{#1}}\n"
if (tabular_only) return(maybe_markdown_fence(paste0(commands, tabular)))
tabular <- paste0("\\setlength{\\tabcolsep}{0pt}\n", tabular)
resize_box <- if (is.na(height <- height(ht))) c("", "") else {
if (is.numeric(height)) height <- sprintf("%.3g\\textheight", height)
c(sprintf("\\resizebox*{!}{%s}{", height), "}")
}
table_env <- table_environment(ht)
table_env <- switch(position(ht),
"wrapleft" = c("\\begin{wraptable}{l}{%s}", "\\end{wraptable}"),
"wrapright" = c("\\begin{wraptable}{r}{%s}", "\\end{wraptable}"),
c(
sprintf("\\begin{%s}[%s]", table_env, latex_float(ht)),
sprintf("\\end{%s}", table_env)
)
)
# no-op except for wraptable:
wraptable_width <- latex_table_width(ht)
if (is.na(wraptable_width)) wraptable_width <- "0.25\\textwidth"
if (position(ht) %in% c("wrapleft", "wrapright")) {
table_env[1] <- sprintf(table_env[1], wraptable_width)
}
table_env <- paste0("\n", table_env, "\n")
cap <- build_latex_caption(ht)
pos_text <- switch(position(ht),
wrapleft = ,
left = c("\\begin{raggedright}\n", "\\par\\end{raggedright}\n"),
center = c("\\begin{centerbox}\n", "\\par\\end{centerbox}\n"),
wrapright = ,
right = c("\\begin{raggedleft}\n", "\\par\\end{raggedleft}\n")
)
cap_top <- grepl("top", caption_pos(ht))
cap <- if (cap_top) c(cap, "") else c("", cap)
tpt <- c("\\begin{threeparttable}\n", "\n\\end{threeparttable}")
res <- if (is.na(caption_width(ht))) {
nest_strings(table_env, pos_text, tpt, cap, tabular)
} else {
nest_strings(table_env, cap, pos_text, tabular)
}
res <- paste0(commands, res)
return(maybe_markdown_fence(res))
}
build_latex_caption <- function (ht, lab) {
lab <- make_label(ht)
cap_has_label <- FALSE
if (is.na(cap <- make_caption(ht, lab, "latex"))) {
cap <- ""
} else {
cap_has_label <- ! is.null(attr(cap, "has_label"))
hpos <- get_caption_hpos(ht)
cap_just <- switch(hpos,
left = "raggedright",
center = "centering",
right = "raggedleft"
)
cap_width <- caption_width(ht)
if (is.na(cap_width)) {
cap_margins <- ""
} else {
if (! is.na(suppressWarnings(as.numeric(cap_width)))) {
cap_width <- sprintf("%s\\textwidth", cap_width)
}
cap_margin_width <- paste("\\textwidth - ", cap_width)
cap_margins <- switch(hpos,
right = c(cap_margin_width, "0pt"),
center = rep(paste0("(", cap_margin_width, ")/2"), 2),
left = c("0pt", cap_margin_width)
)
cap_margins <- sprintf("margin={%s,%s},", cap_margins[1], cap_margins[2])
}
cap <- sprintf(
"\\captionsetup{justification=%s,%ssinglelinecheck=off}\n\\caption{%s}\n",
cap_just, cap_margins, cap)
}
lab <- if (is.na(lab) || cap_has_label) "" else sprintf("\\label{%s}\n", lab)
cap <- paste(cap, lab)
return(cap)
}
build_tabular <- function (ht) {
if (! check_positive_dims(ht)) return("")
## PREPARE EMPTY PARTS -------
multirow <- multicol <- bg_color <- inner_cell <- contents <- matrix("", nrow(ht), ncol(ht))
# Precalculate align, collapsed borders, and width.
real_align <- real_align(ht)
display_cells <- display_cells(ht, all = TRUE)
# Could speed this up by doing it only for display cells.
start_end_cols <- as.matrix(display_cells[, c("display_col", "end_col")])
width_spec <- apply(start_end_cols, 1, function (x) compute_width(ht, x[1], x[2]))
cb <- get_visible_borders(ht)
cbc <- collapsed_border_colors(ht)
cbs <- collapsed_border_styles(ht)
## PREPARE INDICES -----------
dc_pos_matrix <- as.matrix(display_cells[, c("display_row", "display_col")])
dc_map <- matrix(1:length(contents), nrow(ht), ncol(ht))
# dc_map gives the display cells corresponding to real cells, in as.vector(cell_contents) space
dc_map <- c(dc_map[dc_pos_matrix])
dc_idx <- ! display_cells$shadowed
left_idx <- display_cells$col == display_cells$display_col
right_idx <- display_cells$col == display_cells$end_col
bottom_idx <- display_cells$row == display_cells$end_row
multirow_idx <- display_cells$rowspan > 1
bl_idx <- bottom_idx & left_idx
blm_idx <- bl_idx & multirow_idx
# lh_dc (bl_dc) gives the display cells corresponding to (bottom) left cells
bl_dc <- dc_map[bl_idx]
lh_dc <- dc_map[left_idx]
## CALCULATE HHLINES ---------
# Done for n+1 rows including "row 0" at the top
horiz_b <- cb$horiz
hb_maxes <- apply(horiz_b, 1, max)
if (any(horiz_b > 0 & horiz_b < hb_maxes[row(horiz_b)])) warning(
"Multiple horizontal border widths in a single row; using the maximum.")
# even if a cell"s own border is 0, it still needs a "border" the right width,
# matching its background color.
# decide now if border will be printed in foreground or background color:
has_own_border <- horiz_b > 0
# set border widths to the row maximum:
horiz_b[] <- hb_maxes[row(horiz_b)]
hb_default <- is.na(cbc$horiz)
hb_colors <- format_color(cbc$horiz, default = "black")
hb_chars <- ifelse(cbs$horiz == "double", "=", "-")
# background colors come from shadowing cells
bg_colors <- background_color(ht)[dc_map]
dim(bg_colors) <- dim(ht)
# add a top row for the first hhline
bg_colors <- rbind(rep(NA, ncol(horiz_b)), bg_colors) # or, should color be taken from cells below?
bg_colors <- format_color(bg_colors, default = "white")
hhline_colors <- bg_colors
hhline_colors[has_own_border] <- hb_colors[has_own_border]
hhlines_horiz <- sprintf(">{\\huxb{%s}{%.4g}}%s", hhline_colors, horiz_b, hb_chars)
dim(hhlines_horiz) <- dim(horiz_b)
no_hborder_in_row <- hb_maxes[row(hhlines_horiz)] == 0
hhlines_horiz[no_hborder_in_row] <- ""
# vertical borders in hhlines are an n+1 x n+1 matrix of "corner dots"
vert_b <- cb$vert # nrow X ncol + 1
# we add an extra row to match the nrow+1 hhlines
vert_b <- rbind(vert_b[1, ], vert_b) # we checked positive dims; row 1 exists
vert_bs <- rbind(cbs$vert[1, ], cbs$vert)
# vertical dots should have colour from, in order of preference:
# (a) left horiz border; (b) right horiz border; (c) lower vert border; (d) upper vert border
# We use lower borders first on the theory that the "top of a square" matters more
# even if a colour is undefined, we treat it as black so long as there is a positive-length border
vert_bc <- cbind(NA, cbc$horiz) # horiz border color on left
no_left_hb <- cbind(0, cb$horiz) == 0
no_lr_hb <- no_left_hb & cbind(cb$horiz, 0) == 0
no_lrb_b <- no_lr_hb & rbind(cb$vert, 0) == 0
vert_bc[no_left_hb] <- cbind(cbc$horiz, NA)[no_left_hb] # horiz border color on right
vert_bc[no_lr_hb] <- rbind(cbc$vert, NA)[no_lr_hb] # vert border color below
vert_bc[no_lrb_b] <- rbind(NA, cbc$vert)[no_lrb_b] # vert border color above
# if it's still NA, no border on any side had a defined colour
# At the moment we reset to black. Otherwise maybe we "bleed" along the row from much earlier.
vert_bc <- format_color(vert_bc, default = "black")
hhlines_vert <- rep("", length(vert_b))
has_vert_b <- vert_b > 0
# here we want the real borders, not the row maxes of `horiz_b`:
has_horiz_b <- cbind(cb$horiz[, 1], cb$horiz) > 0
vert_bchars <- rep("", length(vert_bc))
# Put in | when you have a single meets no border;
# Put in || where a double meets no border;
# Otherwise, leave them blank
# PROBLEM: if you have no border on L, you don't get a horizontal line (of the right colour)
vert_bchars[! vert_bs == "double" & ! has_horiz_b] <- "|"
vert_bchars[vert_bs == "double" & ! has_horiz_b] <- "||"
hhlines_vert[has_vert_b] <- sprintf(">{\\huxb{%s}{%.4g}}%s",
vert_bc[has_vert_b],
vert_b[has_vert_b],
vert_bchars[has_vert_b])
hhlines_vert[vert_bchars == ""] <- ""
dim(hhlines_vert) <- c(nrow(horiz_b), ncol(horiz_b) + 1) # n+1 x n+1
# interleave vertical and horizontal lines like: |-|-|-|
hhlines <- matrix("", nrow(hhlines_horiz), ncol(hhlines_horiz) + ncol(hhlines_vert))
hhlines[, seq(2, ncol(hhlines), 2)] <- hhlines_horiz
hhlines[, seq(1, ncol(hhlines), 2)] <- hhlines_vert
hhlines <- apply(hhlines, 1, paste0, collapse = "")
hhlines <- sprintf("\n\n\\hhline{%s}\n\\arrayrulecolor{black}\n", hhlines)
## CELL CONTENTS -------------
## inner_cell is empty except for the *bottom* left of a 'display area' (including 1x1)
## this avoids a problem with later cells overpainting borders etc.
## inner_cell has padding, alignment, wrap and row_height TeX added
## inner_cell data comes from the 'display cell' at the top left of the display area
inner_cell_bldc <- clean_contents(ht, output_type = "latex")[bl_dc]
fs_bldc <- font_size(ht)[bl_dc]
line_space_bldc <- round(fs_bldc * 1.2, 2)
has_fs_bldc <- ! is.na(fs_bldc)
inner_cell_bldc[has_fs_bldc] <- sprintf("{\\fontsize{%.4gpt}{%.4gpt}\\selectfont %s}",
fs_bldc[has_fs_bldc], line_space_bldc[has_fs_bldc], inner_cell_bldc[has_fs_bldc])
tc_bldc <- text_color(ht)[bl_dc]
tcf_bldc <- format_color(tc_bldc)
has_tc_bldc <- ! is.na(tc_bldc)
inner_cell_bldc[has_tc_bldc] <- sprintf("\\textcolor[RGB]{%s}{%s}", tcf_bldc[has_tc_bldc],
inner_cell_bldc[has_tc_bldc])
bold_bldc <- bold(ht)[bl_dc]
italic_bldc <- italic(ht)[bl_dc]
inner_cell_bldc[bold_bldc] <- sprintf("\\textbf{%s}", inner_cell_bldc[bold_bldc])
inner_cell_bldc[italic_bldc] <- sprintf("\\textit{%s}", inner_cell_bldc[italic_bldc])
font_bldc <- font(ht)[bl_dc]
has_font_bldc <- ! is.na(font_bldc)
font_template <- if (getOption("huxtable.latex_use_fontspec", FALSE)) {
"{\\fontspec{%s} %s}"
} else {
"{\\fontfamily{%s}\\selectfont %s}"
}
inner_cell_bldc[has_font_bldc] <- sprintf(font_template,
font_bldc[has_font_bldc],
inner_cell_bldc[has_font_bldc])
rt_bldc <- rotation(ht)[bl_dc]
has_rt_bldc <- rt_bldc != 0
inner_cell_bldc[has_rt_bldc] <- sprintf("\\rotatebox{%.4g}{%s}", rt_bldc[has_rt_bldc],
inner_cell_bldc[has_rt_bldc])
pad_bldc <- list()
pad_bldc$left <- left_padding(ht)[bl_dc]
pad_bldc$right <- right_padding(ht)[bl_dc]
pad_bldc$top <- top_padding(ht)[bl_dc]
pad_bldc$bottom <- bottom_padding(ht)[bl_dc]
align_bldc <- real_align[bl_dc]
valign_bldc <- valign(ht)[bl_dc]
wrap_bldc <- wrap(ht)[bl_dc] & ! is.na(width(ht)) # tables without width turn wrapping off
has_pad_bldc <- lapply(pad_bldc, Negate(is.na))
pad_bldc <- lapply(pad_bldc, function (x) if (is.numeric(x)) sprintf("%.4gpt", x) else x)
tpad_tex_bldc <- rep("", length(pad_bldc$top))
tpad_tex_bldc[has_pad_bldc$top] <- sprintf("\\huxtpad{%s + 1em}",
pad_bldc$top[has_pad_bldc$top])
bpad_tex_bldc <- rep("", length(pad_bldc$bottom))
bpad_vals_bldc <- pad_bldc$bottom[has_pad_bldc$bottom]
bpad_tex_bldc[has_pad_bldc$bottom] <- sprintf("\\huxbpad{%s}", bpad_vals_bldc)
align_tex_key <- c("left" = "\\raggedright ", "right" = "\\raggedleft ", "center" = "\\centering ")
align_tex_bldc <- align_tex_key[align_bldc]
lpad_tex_bldc <- ifelse(has_pad_bldc$left & ! wrap_bldc,
sprintf("\\hspace{%s} ", pad_bldc$left), "")
rpad_tex_bldc <- ifelse(has_pad_bldc$right & ! wrap_bldc,
sprintf(" \\hspace{%s}", pad_bldc$right), "")
inner_cell_bldc <- paste0(tpad_tex_bldc, align_tex_bldc, lpad_tex_bldc, inner_cell_bldc,
rpad_tex_bldc, bpad_tex_bldc)
if (any(wrap_bldc)) {
# reverse of what you think. "b" aligns the *bottom* of the text with the baseline
# ... this doesn"t really work for short text!
valign_tex_key <- c("top" = "b", "middle" = "c", "bottom" = "t")
valign_bldc <- valign_tex_key[valign_bldc]
# XXX should be a way to speed up by only doing dc_idx cells. but we run again at some point...
width_spec_bldc <- width_spec[bl_dc]
left_pad_bldc <- ifelse(has_pad_bldc$left, sprintf("\\hspace{%s}", pad_bldc$left), "")
hpad_loss_left_bldc <- ifelse(has_pad_bldc$left, paste0("-", pad_bldc$left), "")
hpad_loss_right_bldc <- ifelse(has_pad_bldc$right, paste0("-", pad_bldc$right), "")
inner_cell_bldc[wrap_bldc] <- sprintf("%s\\parbox[%s]{%s%s%s}{%s}",
left_pad_bldc[wrap_bldc],
valign_bldc[wrap_bldc],
width_spec_bldc[wrap_bldc],
hpad_loss_left_bldc[wrap_bldc],
hpad_loss_right_bldc[wrap_bldc],
inner_cell_bldc[wrap_bldc]
)
}
## ROW HEIGHT--------
row_height <- row_height(ht)
# for each display_cell, we "sum" row_heights for each row it covers
row_height_tex_bldc <- if (all(is.na(row_height))) {
rep("", sum(dc_idx))
} else {
# bl_to_dc for matrices:
start_end_rows_bldc <- display_cells[dc_map, c("display_row", "end_row")][bl_idx, ]
row_seqs_bldc <- apply(start_end_rows_bldc, 1, function (x) seq(x[1], x[2]))
rh_bldc <- sapply(row_seqs_bldc, function (x) {
rh <- row_height[x]
# use the LaTeX calc package to sum non-numeric row heights within LaTeX:
if (is.numeric(rh)) sprintf("%.4g\\textheight", sum(rh)) else paste(rh, collapse = "+")
})
sprintf("\\rule{0pt}{%s}", rh_bldc)
}
inner_cell_bldc <- paste0(inner_cell_bldc, row_height_tex_bldc)
# assign all this to bottom left cells:
inner_cell[bl_idx] <- inner_cell_bldc
## CELL BACKGROUND COLORS -------
## cell background colors are added to left hand row of a "display area"; these come
## from the colors of the "display cell".
bg_color_lhdc <- background_color(ht)[lh_dc]
has_bg_color_lhdc <- ! is.na(bg_color_lhdc)
bg_color_lhdc <- format_color(bg_color_lhdc)
bg_color_lhdc <- sprintf("\\cellcolor[RGB]{%s}", bg_color_lhdc)
bg_color_lhdc[! has_bg_color_lhdc] <- "" # NAs don't have a \cellcolor instruction
bg_color[left_idx] <- bg_color_lhdc
## VERTICAL BORDERS AND COLSPEC -------
## like cell colors, these are provided for all left hand cells, from display cells
## if display cell wrap, is TRUE, set colspec to p/m/b with widthspec
## otherwise, set colspec to l/c/r
## left borders are blank, except for the first row; we collapse borders into right border position
colspan_lhdc <- colspan(ht)[lh_dc]
wrap_lhdc <- wrap(ht)[lh_dc] & ! is.na(width(ht))
valign_lhdc <- valign(ht)[lh_dc]
real_align_lhdc <- real_align[lh_dc]
colspec_tex_key <- c("left" = "l", "center" = "c", "right" = "r")
real_align_lhdc <- colspec_tex_key[real_align_lhdc]
colspec_lhdc <- real_align_lhdc # only for non-wrapped cells though
# as this is calculated for the whole display area, it doesn't matter whether
# you map to display cells or not:
width_spec_lhdc <- width_spec[lh_dc]
colspec_lhdc[wrap_lhdc] <- {
pmb <- valign_lhdc[wrap_lhdc]
pmb_tex_key <- c("top" = "p", "bottom" = "b", "middle" = "m")
pmb <- pmb_tex_key[pmb]
sprintf("%s{%s}", pmb, width_spec_lhdc[wrap_lhdc])
}
# do left and right borders...
# these are nrow x ncol + 1
bord <- cb$vert
bcol <- cbc$vert
has_bord <- ! is.na(bord)
bs_double <- cbs$vert == "double"
bcol <- format_color(bcol, default = "black")
bord_tex <- rep("", length(bord))
bord_tex[has_bord] <- sprintf("!{\\huxvb{%s}{%.4g}}", bcol[has_bord], bord[has_bord])
bord_tex[bs_double] <- paste0(bord_tex[bs_double], bord_tex[bs_double])
dim(bord_tex) <- dim(cb$vert)
# the first column is the left border of the left-most cell.
# subsequent columns become the right border of all cells.
lborders <- matrix("", nrow(contents), ncol(contents))
lborders[, 1] <- bord_tex[, 1]
rborders <- bord_tex[, - 1]
# lborders and rborders are already in 'correct' positions, as calculated by collapsed_borders
# we need to have only the rborders that correspond to a display area's right hand border;
# these should go in the left hand cell position with the other stuff!
# We work out the correct rborders by row:
for (r in seq_len(nrow(ht))) {
row_idx <- row(ht) == r
rborders[left_idx & row_idx] <- rborders[right_idx & row_idx]
}
# all left hand cells have borders
multicol[left_idx] <- sprintf("\\multicolumn{%d}{%s%s%s}{",
colspan_lhdc,
lborders[left_idx],
colspec_lhdc,
rborders[left_idx]
)
## MULTIROW ---------------------
rowspan_blm <- rowspan(ht)[dc_map][blm_idx]
valign_blm <- valign(ht)[dc_map][blm_idx]
valign_multirow_key <- c(
"top" = "t",
"middle" = "c",
"bottom" = "b"
)
valign_blm <- valign_multirow_key[valign_blm]
vert_adj_blm <- sprintf("%dex", 0) # start printing on the top row
# * is "standard width", could be more specific?
multirow_blm_tex <- sprintf("\\multirow[%s]{-%s}{*}[%s]{", valign_blm,
rowspan_blm, vert_adj_blm)
multirow[blm_idx] <- multirow_blm_tex
## FINAL ASSEMBLY----------------
closer <- function (x) ifelse(nzchar(x), "}", "")
contents <- paste0(
multicol,
multirow,
bg_color,
inner_cell,
closer(multirow),
closer(multicol)
)
dim(contents) <- dim(ht)
content_rows <- apply(contents, 1, function (x) {
x <- x[nzchar(x)]
row <- paste(x, collapse = " &\n")
paste(row, "\\tabularnewline[-0.5pt]")
})
table_body <- paste(content_rows, hhlines[-1], sep = "\n", collapse = "\n")
table_body <- paste(hhlines[1], table_body, sep = "\n")
tenv <- tabular_environment(ht)
if (is.na(tenv)) tenv <- if (is.na(width(ht))) "tabular" else "tabularx"
tenv_tex <- paste0(c("\\begin{", "\\end{"), tenv, "}")
width_spec <- if (tenv %in% c("tabularx", "tabular*", "tabulary")) {
tw <- latex_table_width(ht)
paste0("{", tw, "}")
} else {
""
}
colspec_top <- if (is.na(width(ht))) {
rep("l", ncol(ht))
} else {
sapply(seq_len(ncol(ht)), function (mycol) {
sprintf("p{%s}", compute_width(ht, mycol, mycol))
})
}
colspec_top <- paste0(colspec_top, collapse = " ")
colspec_top <- sprintf("{%s}\n", colspec_top)
res <- paste0(tenv_tex[1], width_spec, colspec_top, table_body, tenv_tex[2])
return(res)
}
latex_table_width <- function (ht) {
tw <- width(ht)
if (is.numeric(tw) && ! is.na(tw)) {
tw <- paste0(tw, default_table_width_unit)
}
return(tw)
}
compute_width <- function (ht, start_col, end_col) {
table_width <- width(ht)
if (is.numeric(table_width)) {
table_unit <- default_table_width_unit
table_width <- as.numeric(table_width)
} else {
table_unit <- gsub("\\d", "", table_width)
table_width <- as.numeric(gsub("\\D", "", table_width))
}
cw <- col_width(ht)[start_col:end_col]
cw[is.na(cw)] <- 1 / ncol(ht)
cw <- if (! is.numeric(cw)) {
paste(cw, collapse = "+")
} else {
cw <- sum(as.numeric(cw))
cw <- cw * table_width
paste0(cw, table_unit)
}
if (end_col > start_col) {
# need to add some extra tabcolseps, two per column
extra_seps <- (end_col - start_col) * 2
cw <- paste0(cw, "+", extra_seps, "\\tabcolsep")
}
cw
}
maybe_markdown_fence <- function (text) {
fence <- FALSE
if (requireNamespace("knitr", quietly = TRUE)) {
in_rmarkdown <- ! is.null(knitr::opts_knit$get("rmarkdown.pandoc.to"))
if (in_rmarkdown && requireNamespace("rmarkdown", quietly = TRUE)) {
fence <- rmarkdown::pandoc_version() >= "2.0.0"
}
}
if (fence) {
text <- paste("\n\n```{=latex}\n", text, "\n```\n\n")
}
return(text)
}