antlr /

grammars-v4

Grammars written for ANTLR v4; expectation that the grammars are free of actions

A new way for AI to search for data

View on GitHub

11,058GitHub stars

C++

What XERJ indexed

Snapshot

Whole repository

The whole repository at commit 04b362f71d (2026-10-22).

Selected work

Pavel Bondar
@bondar-p

“Added C++23 grammar”. 15 files, 2,296 lines in cpp.

Licence

The repository

MIT

From GitHub's licence detection. A person still checks the LICENSE file at the pinned commit.

The XERJ corpus

MIT, with credit

The author agreed by email on 2026-10-23. Same terms as the repository. Answers name the repo, the commit and the file:line.

in licence reviewnot in the hub yetsuggested use: adapt with attribution

hacktoberfest

Example questions

How does grammars-v4 implement hacktoberfest?
Where does grammars-v4 handle “Added C++23 grammar”?
What does cpp do in grammars-v4?

The prompt

Paste it into your AI agent. It clones antlr/grammars-v4 at the pinned commit and indexes it on your machine.

Search the GitHub repository antlr/grammars-v4 with XERJ (https://hub.xerj.org/corpus/antlr--grammars-v4).
Run these in a shell, in order, and check each result before the next:
1. xerj --help  (success: it prints usage). If xerj is missing: curl -fsSL https://xerj.org/get | sh
2. git clone https://github.com/antlr/grammars-v4 grammars-v4 && git -C grammars-v4 checkout 04b362f71d357f581d191969c3ae0e56be296eaa
3. Start a local node and leave it running: xerj --insecure --data-dir ./xerj-data
4. xerj autoindex ./grammars-v4 --url http://127.0.0.1:9200 --prefix grammars-v4 --progress plain
5. xerj autoindex map --url http://127.0.0.1:9200
Then answer my question from the indexed files and cite the ax_path of every hit. Query syntax: https://xerj.org/llms.txt
Licence: MIT. Keep the copyright notice and credit the authors.

Pavel Bondar API design and specification corpora xerj-columnar quinn kics zmertens/MazeBuilder symfony/symfony Ayberkrk/timoshenko

Selected work and consent: the XERJ registry.