突出显示xaringan中的代码选择

如何在xaringan中突出显示单个单词或选择的代码而不是整行？

在下面的例子中,我想只突出显示管道操作符%>% 而不是整行.

---
output:
  xaringan::moon_reader:
    css: [default]
    lib_dir: libs
    nature:
      highlightStyle: github
      highlightLines: true
      countIncrementalSlides: false
---

```{r setup, include=F}
library(magrittr)
```

Highlight Whole Line (not what I need)
```{r, eval=F}
iris %>% #<<
  summary()
```

Highlight Whole Line 2 (also not what I need)
```{r, eval=F}
{{ iris %>% }}
  summary()
```

Highlight Pipe only (What I would need, doesnt work)
```{r, eval=F}
iris {{ %>% }}
  summary()
```

Highlight Pipe only html-mark (doesnt work, as expected)
```{r, eval=F}
iris %>%
  summary()
```

结果如此

任何帮助表示赞赏.

我找到了一个解决方案:highlightSpans: true在代码中使用然后使用反引号.也就是说,

---
output:
  xaringan::moon_reader:
    css: [default]
    lib_dir: libs
    nature:
      highlightStyle: github
      highlightLines: true
      highlightSpans: true
      countIncrementalSlides: false
---

```{r, eval=F}
iris `%>%`
  summary()
```

产生

该方法的唯一警告是它只在R本身不评估代码时运行.(eval=TRUE会返回错误)

其来源是:https://github.com/gnab/remark/wiki/Configuration