It is impossible to do with just parser, it would need to be full evaluator, especially that it requires to know about the called module.

Hey some updates for Autumn that might be worth checking out:

• Added support to include a header element wrapping the code block
• Added support to highlight specific lines using a CSS class or style (depends on the formatter)
• Added more languages and a Random button on the demo site https://autumnus.dev
• Functions to “bring your own theme” - you can edit themes and load at runtime
• Added more than 10 new themes and updated a few more
• Added new languages

Full changelog at Changelog — Autumn v0.4.1

Really smart to use tree sitter for this.

v0.5.0 released with a focus on highlighting lines, for example to highlight some lines with custom style:

{:html_inline, highlight_lines: %{lines: [1, 3..5, 8], style: "background-color: #fff3cd; border-left: 3px solid #ffc107;"}}

Also updated languages and themes, and replace <span> with <div> for lines. Full changelog at Changelog — Autumn v0.5.0

Hey Valim thanks! Indeed tree-sitter works very well with a relatively small binary and possibly even smaller thanks to feature flags

Tree-sitter is pretty much becoming a standard and even vscode is exploring using it. Leaving this issue for those interested Explore using tree sitter for syntax highlighting · Issue #210475 · microsoft/vscode · GitHub