https://github.com/romainfrancois/highlight

Syntax highlighter for R
https://github.com/romainfrancois/highlight

highlight package r syntax-highlighting

Last synced: 26 days ago
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Syntax highlighter for R

• Host: GitHub
• URL: https://github.com/romainfrancois/highlight
• Owner: romainfrancois
• License: other
• Created: 2013-10-29T06:39:29.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2019-01-17T20:55:49.000Z (over 5 years ago)
• Last Synced: 2024-05-01T22:59:21.377Z (2 months ago)
• Topics: highlight, package, r, syntax-highlighting
• Language: R
• Size: 1.25 MB
• Stars: 33
• Watchers: 1
• Forks: 7
• Open Issues: 11
• Metadata Files:
  • Readme: README.Rmd
  • License: LICENSE

Lists

• jimsghstars - romainfrancois/highlight - Syntax highlighter for R (R)

README

        
---

output: github_document

---

```{r, echo = FALSE}

library(highlight)

knitr::opts_chunk$set(

  collapse = TRUE,

  comment = "#>",

  fig.path = "README-"

)

```

# highlight

highlight is a syntax highlighter for R code. 

## Installation

You can install highlight from github with:

```r

# install.packages("devtools")

devtools::install_github("romainfrancois/highlight")

```

## Typical highlighting (lestrade)

Typical syntax highlighting is only interested in whether a token is a function 

call, a keyword, a string, ... this is what the `lestrade` detective does:

```r

highlight( file = "css_file.R", detective = lestrade )

```

This will look like this: 

![](img/lestrade.png)

This differentiates function calls, 

formal arguments,  used arguments ... 

because `lestrade` identified these tokens as such. 

## semantic highlighting (sherlock)

Traditional highlighting only reveals the obvious, so the package also benefits from 

the investigation of `sherlock` for semantic highlighting. In semantic highlighting, 

every symbol gets a different color. 

```r

highlight( file = "css_file.R", detective = sherlock )

```

![](img/sherlock.png)

With this we can quickly skim through the file and see e.g. the different uses of `filename`. 

## In rmarkdown

To use in `rmarkdown` you can use the `hl_hook_source` and `hl_hook_document` hooks. Unfortunately this 

does not work for README on github so this document uses screenshots. 

```r

knitr::knit_hooks$set( 

  source = hl_hook_source, 

  document = hl_hook_css

)

```