TOON

TOON Language Support for Zed

This extension provides complete language support for TOON (Token-Oriented Object Notation) in the Zed editor.

Features

• Syntax Highlighting: Complete syntax highlighting for all TOON language elements

  • Object keys (both quoted and unquoted) and property names
  • Primitive values: strings, numbers (including scientific notation), booleans, null
  • Array headers with length declarations [n] and optional field lists {field1,field2}
  • Delimiters (comma, tab, pipe)
  • List markers (hyphens)
  • String escape sequences

• Bracket Matching: Automatic matching for [], {}, and ""

• Auto-Indentation: Smart indentation following TOON structure

  • Nested objects with proper indentation levels
  • Array bodies (both tabular data and object lists)
  • Automatic dedenting
  • FIXME: When typing a newline after certain lines, the cursor indents to the wrong level

• Code Outline: Navigate TOON documents with structure view

  • All object keys visible
  • Works with both simple values and arrays

About TOON

TOON (Token-Oriented Object Notation) is a line-oriented, indentation-based text format that encodes the JSON data model with explicit structure and minimal quoting. It is designed as a compact, deterministic representation of structured data, particularly well-suited to arrays of uniform objects.

Example

users[2]{id,name,role}:
  1,Alice,admin
  2,Bob,user

Installation

1. Open Zed
2. Go to Extensions (Cmd+Shift+X or Ctrl+Shift+X)
3. Search for "TOON"
4. Click Install

File Association

Files with the .toon extension are automatically recognized.

Grammar

This extension uses the tree-sitter-toon.

Specification

For the complete TOON specification, see the official spec.

License

GPL-3.0-or-later