tree-sitter-scheme

Scheme grammar for tree-sitter.

Recent News

• With R7RS support, a single | can no longer appear in the middle of an identifier.
• The node directive no longer contains the sub node symbol. It is now a single node.
• Some extensions were added, see below.

Status

tree-sitter-scheme should work on a superset of Scheme.

Different implementations might have conflicting grammars. I am not sure if I should support them. If you need some implementation-specific features, please open an issue, then I will consider supporting it.

current status:

• R5RS
• R6RS
• R7RS
• Extensions
  • {} as replacement for () or []
  • extend symbols which can start with digits, period, ... etc as long as it's not a number
  • keyword #:symbol
  • escape sequence in string \ + any character
  • characters #\bel, #\ls, #\nel, #\rubout, #\vt
  • character #\u[A-Fa-f0-9]+

Please open an issue to let me know it's really used if you want to add new extensions.

Implementation

• Support for implementation
  • Chez Scheme (#1)
  • Chicken Scheme (#3)
  • Guile Scheme (#7)
  • Steel Scheme (#17)

Usage

See nodes.md for all visible nodes.

This parser doesn't parse language constructs. Instead, it parses code as lists.

If you want language constructs support, use custom queries (see #5), also see thchha/tree-sitter-scheme.

Query

The queries here are too simple and not intended to be useful in an editor. Please open an issue if you have suggestions.

Reference

Scheme

• R5RS
• R6RS
• R7RS
• The Scheme Programming Language

Tree-sitter

• official documents
• Guide to your first Tree-sitter grammar
• tree-sitter-clojure
• tree-sitter-commonlisp
• tree-sitter-fennel