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[#2094] Add documentation to LSP hovers

Sorokin-Anton requested to merge Sorokin-Anton/#2094-comments-in-ast into dev

Motivation and Context

We want to save comments in AST to show documentation on hover.

Related issues

Resolves none .

Part of #2094

Checklist for the LIGO Language Server

  • I checked whether I need to update the file for the plugin and did so if necessary:
    • If I implemented a new LSP request, I added it to the list of supported features that may be disabled
    • If I implemented a new LSP method, I added it to the list of supported functionality
  • I checked that my changes work in Emacs, Vim, and Visual Studio Code
  • (Before merging) The commit history is squashed and prettified, and follows the Serokell commit policy, or the MR is set to squash the commits


To do this we're inserting [@comment "..."] attributes during a lexer self-pass.

Adopt Nanopasses.Trivial.To_core. so it allows such attributes everywhere and saves them to Ast where needed.

Adopt scopes definition pass so it remembers attributes.

Obtain attributes of a hovered object, if needed add a markdown for this comment to the returned list of hovers.


  • compiler
  • website
  • webide
  • vscode-plugin
  • debugger

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Performance improvement (non-breaking change that improves performance)
  • None (change with no changelog)


Now we show documentation comments (like (** *) in CameLIGO and /** */ in JsLIGO) in LSP hovers


  • Changes follow the existing coding style (use dune @fmt to check).
  • Tests for the changes have been added (for bug fixes / feature).
  • Documentation has been updated.
  • Changelog description has been added (if appropriate).
  • Start titles under ## Changelog section with #### (if appropriate).
  • There is no image or uploaded file in changelog
  • Examples in changed behaviour have been added to the changelog (for breaking change / feature).
Edited by Sorokin-Anton

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