Tree-sitter grammar for GCF, the token-optimized wire format for LLMs.

Enables syntax highlighting in Neovim, Helix, Zed, Emacs, and any editor that supports tree-sitter.

• Header lines (GCF tool=... symbols=... edges=...)
• Section headers (## targets, ## edges [N], ## name [N]{fields})
• Symbol lines (@0 fn pkg.Auth 0.78 lsp_resolved)
• Edge lines (@0<@1 calls)
• Bare references (@0 # previously transmitted)
• Key-value pairs (key=value)
• Inline arrays (tags[3]: read,write,admin)
• Tabular rows (Alice|Engineering|95000)
• Nested fields (.customer)
• Summary trailers (## _summary symbols=3 edges=2)
• Comments (# text)

Add to your tree-sitter config:

local parser_config = require("nvim-treesitter.parsers").get_parser_configs()
parser_config.gcf = {
  install_info = {
    url = "https://github.com/blackwell-systems/tree-sitter-gcf",
    files = { "src/parser.c" },
    branch = "main",
  },
  filetype = "gcf",
}

Then :TSInstall gcf.

Copy queries/highlights.scm to ~/.config/nvim/queries/gcf/highlights.scm.

Add to languages.toml:

[[language]]
name = "gcf"
scope = "source.gcf"
file-types = ["gcf"]
roots = []

[language.auto-pairs]

[[grammar]]
name = "gcf"
source = { git = "https://github.com/blackwell-systems/tree-sitter-gcf", rev = "main" }

Then hx --grammar fetch && hx --grammar build.

npm install
tree-sitter generate
tree-sitter parse test.gcf
tree-sitter highlight test.gcf

MIT - Dayna Blackwell