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Modified fct longmcq so that it correctly handle mathjax expression when using "cat" to output content of longmcq #22

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Modified fct longmcq so that it correctly handle mathjax expression when using "cat" to output content of longmcq #22

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26 changes: 22 additions & 4 deletions R/webexercises_fns.R
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,11 @@ fitb <- function(answer,
html, pdf)
}






#' Create a multiple-choice question
#'
#' @param opts Vector of alternatives. The correct answer is the
Expand Down Expand Up @@ -120,10 +125,13 @@ mcq <- function(opts) {
# check type of knitting
out_fmt <- knitr::opts_knit$get("out.format")
pandoc_to <- knitr::opts_knit$get("rmarkdown.pandoc.to")

ifelse((is.null(out_fmt) & is.null(pandoc_to)) ||
isTRUE(out_fmt == "html") ||
isTRUE(pandoc_to == "html"),
html, pdf)


}

#' Create a true-or-false question
Expand Down Expand Up @@ -157,6 +165,15 @@ torf <- function(answer) {
mcq(opts), "TRUE / FALSE")
}

# Function that add backslashes when mathjax is identified in the possible answers so that when printing using cat, it render correctly.
# This ensure that when you print the output of longmcq using "cat", the math are correctly displayed as "\" is an escape character in R.
add_backslashes <- function(input_string) {
# Use regular expressions to replace single backslashes with double backslashes
result <- gsub("\\\\", "\\\\\\\\", input_string)
return(result)
}



#' Longer MCQs with Radio Buttons
#'
Expand All @@ -183,6 +200,7 @@ torf <- function(answer) {
#'
#' @export
longmcq <- function(opts) {

ix <- which(names(opts) == "answer")
if (length(ix) == 0) {
stop("The question has no correct answer")
Expand All @@ -206,10 +224,10 @@ longmcq <- function(opts) {
# check type of knitting
out_fmt <- knitr::opts_knit$get("out.format")
pandoc_to <- knitr::opts_knit$get("rmarkdown.pandoc.to")
ifelse((is.null(out_fmt) & is.null(pandoc_to)) ||
isTRUE(out_fmt == "html") ||
isTRUE(pandoc_to == "html"),
html, pdf)
add_backslashes(ifelse((is.null(out_fmt) & is.null(pandoc_to)) ||
isTRUE(out_fmt == "html") ||
isTRUE(pandoc_to == "html"),
html, pdf))
}


Expand Down