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#' Print 'LaTeX' equations
#'
#' lifecycle::badge("stable")`
#'
#' Print 'LaTeX' equations built with \code{\link{extract_eq}}.
#'
#' @export
#'
#' @param x 'LaTeX' equation built with \code{\link{extract_eq}}
#' @param ... not used
#'
print.equation <- function(x, ...) {
cat(format(x), sep = "")
}
#' Print 'LaTeX' equations in Rmarkdown environments
#'
#' Print 'LaTeX' equations built with \code{\link{extract_eq}} nicely in Rmarkdown environments.
#'
#' @keywords internal
#' @export
#'
#' @param x 'LaTeX' equation built with \code{\link{extract_eq}}
#' @param ... not used
#'
#' @method knit_print equation
#'
#' @importFrom knitr knit_print asis_output
#' @noRd
#'
knit_print.equation <- function(x, ..., tex_packages = "\\renewcommand*\\familydefault{\\rmdefault}") {
eq <- format(x)
if (isTRUE(knitr::opts_knit$get("rmarkdown.pandoc.to") %in% c("gfm", "markdown_strict"))) {
if (!is_texPreview_installed()) {
message(
paste(
"Please install \"{texPreview}\" with",
"`install.packages(\"texPreview\")` for equations to render with",
"GitHub flavored markdown. Defaulting to raw TeX code."),
call. = FALSE)
print(eq)
} else {
knit_print(texPreview::tex_preview(eq, usrPackages = tex_packages))
if (knitr::opts_knit$get("rmarkdown.pandoc.to") == "markdown_strict") {
knit_print(texPreview::tex_preview(eq,
usrPackages = tex_packages,
returnType = "html",
density = 300
))
}
}
} else {
return(asis_output(eq))
}
}
#' @keywords internal
#' @noRd
is_texPreview_installed <- function() {
requireNamespace("texPreview", quietly = TRUE)
}
#' format 'LaTeX' equations
#'
#' format 'LaTeX' equations built with \code{\link{extract_eq}}.
#'
#' @export
#'
#' @param x 'LaTeX' equation built with \code{\link{extract_eq}}
#' @param ... not used
#' @noRd
format.equation <- function(x, ...) {
if (is_latex_output()) {
header <- paste0(attr(x, "latex_define_colors"), collapse = "\n")
eq <- paste0(c("\n\n\\begin{equation}\n", x, "\n\\end{equation}"))
paste0(c(header, eq))
} else {
paste0(c("$$\n", x, "\n$$\n"), collapse = "")
}
}
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