Question

运算符%+%在两个软件包中使用，即ggplot2和crayou。

%+%中的功能crayon有时不起作用，我认为%+%中考虑了运算符ggplot2。我尝试通过crayon::%+%进行识别，但这不起作用。

cat(green(
 'I am a green line ' %+%
 blue$underline$bold('with a blue substring') %+%
 ' that becomes green again!'
))

----基于评论：我认为由于我的错过理解而发生以下错误--------

我尝试使用crayon::(backtick)%+%(backtick)而不是%+%来运行以下代码

cat(green(
    'I am a green line ' crayon::`%+%`
        blue$underline$bold('with a blue substring') crayon::`%+%`
        ' that becomes green again!'
))

但是发生以下错误：

  > cat(green(
+     'I am a green line ' crayon::`%+%`
Error: unexpected symbol in:
"cat(green(
    'I am a green line ' crayon"
>         blue$underline$bold('with a blue substring') crayon::`%+%`
Error: unexpected symbol in "        blue$underline$bold('with a blue substring') crayon"
>         ' that becomes green again!'
[1] " that becomes green again!"
> ))
Error: unexpected ')' in ")"

Answer 1

一个选择是不library(crayon)或requireNamespace(crayon)并完全限定所有crayon引用：

cat(crayon::green(
  'I am a green line ' %c+%
    crayon::blue$underline$bold('with a blue substring') crayon::`%+%`
    ' that becomes green again!'
))

但这很烦人。因此，您还可以手动导入并重命名您需要的内容，而无需单独的非核心软件包

：

`%c+%` <- getFromNamespace("%+%", "crayon") # changed to not break other things
green <- getFromNamespace("green", "crayon")
blue <- getFromNamespace("blue", "crayon")

cat(green(
  'I am a green line ' %c+%
    blue$underline$bold('with a blue substring') %c+%
    ' that becomes green again!'
))

如何指定运算符％+％的库，例如pkg ::或pkg :::

1 个答案: