在函数中使用 flextable::display()

use flextable::display() in a function

我正在尝试在函数中使用 flextable::display() 函数,使用显示中函数的参数。以下是我的功能:

add_footnote <- function(df, col, pattern, symbol){

  tmp <- df
  pat <- paste0(pattern, " {{x}}")

  tmp <- display(tmp, 
                 col_key = col,
                 i = ~ col == pattern, 
                 pattern = pat,
                 formatters = list(x ~ as.character(symbol)),
                 fprops = list(x = fp_text(vertical.align = 'superscript')) ) 
  return(tmp)
}

# Call function
df <- regulartable(head(iris))
add_footnote(df, col = 'Species', pattern = 'setosa', symbol = 'a')

我希望在 setosa 出现在 Species 列的任何地方得到一个上标 a,但是它给出了以下错误,表明显示功能无法看到传递给函数的参数:

Error in eval(as.call(f[[2]]), envir = data) : object 'pattern' not found

有谁知道如何从函数中获取参数以供内部 display() 函数识别?

函数 display 很难用 - 这就是我写 flextable::compose 的原因。它可以依赖整洁的 eval 语法。以下 2 个示例应该对您有所帮助:

library(flextable)
library(officer)
library(rlang)

add_footnote_with_rlang <- function(df, col, pattern, symbol){
  form_ <- sprintf("~ %s == '%s'", col, pattern)
  colname <- enquo(col)
  flextable::compose(
    x = df, j = col, i = as.formula(form_), 
    value = as_paragraph(
      as_chunk(!!colname), 
      as_chunk(symbol, props = fp_text(vertical.align = 'superscript')))
    ) 
}
add_footnote <- function(df, col, pattern, symbol){
  form_ <- sprintf("~ %s == '%s'", col, pattern)
  flextable::compose(
    x = df, j = col, i = as.formula(form_), 
    value = as_paragraph(
      as_chunk(symbol, props = fp_text(vertical.align = 'superscript')))
    ) 
}

# Call function
df <- regulartable(head(iris))
# df <- add_footnote(df, col = 'Species', pattern = 'setosa', symbol = 'a')
df <- add_footnote_with_rlang(df, col = 'Species', pattern = 'setosa', symbol = 'a')
df