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get_docx_xml <- function(x) {
  if(inherits(x, "flextable")){
    docx_file <- tempfile(fileext = ".docx")
    doc <- read_docx()
    doc <- body_add_flextable(doc, value = x)
    print(doc, target = docx_file)
    x <- docx_file
  }
  redoc <- read_docx(x)
  xml2::xml_child(docx_body_xml(redoc))
}

get_pptx_xml <- function(x) {
  if(inherits(x, "flextable")){
    pptx_file <- tempfile(fileext = ".pptx")
    doc <- read_pptx()
    doc <- add_slide(doc, layout = "Title and Content", master = "Office Theme")
    doc <- ph_with(doc, x, location = ph_location_type(type = "body"))
    print(doc, target = pptx_file)
    x <- pptx_file
  }

  redoc <- read_pptx(x)
  slide <- redoc$slide$get_slide(redoc$cursor)
  xml2::xml_child(slide$get())
}

get_html_xml <- function(x) {
  if(inherits(x, "flextable")){
    html_file <- tempfile(fileext = ".html")
    save_as_html(tab, path = html_file)
    x <- html_file
  }
  doc <- read_html(x)
  xml_child(doc, "body")
}
get_pdf_text <- function(x, extract_fun) {
  stopifnot(grepl("\\.pdf$", x))

  doc <- extract_fun(x)
  txtfile <- tempfile()
  cat(paste0(doc, collapse = "\n"), file = txtfile)
  readLines(txtfile)
}

render_rmd <- function(file, rmd_format) {
  unlink(file, force = TRUE)
  sucess <- FALSE
  tryCatch(
    {
      render(rmd_file,
             output_format = rmd_format,
             output_file = pdf_file,
             envir = new.env(),
             quiet = TRUE
      )
      sucess <- TRUE
    },
    warning = function(e) {
    },
    error = function(e) {
    }
  )
  sucess
}

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