Rouge

Expressif provides a standalone lexer for Rouge, the syntax highlighter used by Jekyll and other Ruby publishing tools.

Download

Download expressif-syntax-<version>-rouge.zip from the matching version on the GitHub Releases page, then extract the archive. It contains expressif-rouge.rb.

Load the lexer

Make the lexer available to the Ruby process that performs syntax highlighting and require it before Rouge processes any code blocks:

require_relative "expressif-rouge"

Rouge can then find the lexer by its expressif tag:

lexer = Rouge::Lexer.find("expressif").new

The lexer also declares the .expr and .expressif filename patterns.

Use with Jekyll

Place the lexer where your Jekyll configuration can load it before rendering. Once loaded, label fenced code blocks as expressif:

```expressif
@value | trim | upper
```

The exact loading location depends on the site configuration. For a site that permits custom plugins, requiring the lexer from a file in _plugins is a convenient option.

Example

{1, 2, 3, 4}
| filter(greater-than(2))