From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philip Kaludercic Newsgroups: gmane.emacs.devel Subject: Re: Tree-sitter introduction documentation Date: Tue, 27 Dec 2022 20:06:05 +0000 Message-ID: <87cz84y5le.fsf@posteo.net> References: <83edszjslp.fsf@gnu.org> <87tu1vxs3a.fsf@ledu-giraud.fr> <831qozjob7.fsf@gnu.org> <87cz8jxoat.fsf@ledu-giraud.fr> <83wn6ri7pn.fsf@gnu.org> <5e0a3185-de82-b339-0fa2-956779e63d6f@cornell.edu> <868rj6vfep.fsf@gmail.com> <4895891b-e5ea-9c37-f51b-df2e479ee758@yandex.ru> <83y1qt11xq.fsf@gnu.org> <9eb013da-d0fc-8e17-c6e3-1e8f913aebfa@yandex.ru> <83pmc50xxc.fsf@gnu.org> <71cfe4e8-3bb8-b0a6-9be5-8c0a6d92cfab@yandex.ru> <83h6xg29z3.fsf@gnu.org> <838ris22n4.fsf@gnu.org> <8335901zz3.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32892"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Eli Zaretskii , dgutov@yandex.ru, theophilusx@gmail.com, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Dec 27 21:06:49 2022 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pAGDp-0008N2-AV for ged-emacs-devel@m.gmane-mx.org; Tue, 27 Dec 2022 21:06:49 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pAGD9-0002kG-G5; Tue, 27 Dec 2022 15:06:07 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pAGD8-0002k6-EJ for emacs-devel@gnu.org; Tue, 27 Dec 2022 15:06:06 -0500 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pAGD6-00074A-1J for emacs-devel@gnu.org; Tue, 27 Dec 2022 15:06:05 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 30C252401F0 for ; Tue, 27 Dec 2022 21:06:01 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1672171561; bh=qJwRdhgAAQrQBHUKJkZflEsxyx6S82EP2dx5Gbpr+rM=; h=From:To:Cc:Subject:Date:From; b=EoZ6AkfNmapfGEbTYteeWYxTw/9o1aixsqAV9/HKoi8Ni4LBvy01IFn/FpTNvgDXA anxhCx1UYhqGph1YSIKCOYCkZmo33QdV3ZW0rAChVH4kVrA9d8427EKdLP2ozJ4kAC H8WnsRRPMHUmq0TkQ9S4fb5nSfMXvRBlKlxvzQJdtCMs7OYnNS1YEU2wJ7/wOqzCW/ Cy2tPMnKgAlrFNeJtbzU1s9V/fzh2vukSUkhXgpvj4KXren9cYg1VADV+Qyti9v8yj ab8X8IINZ79dRrXHt5BS3qIklgGhbkiZsT+bRDgnvOpWqaytG/xlGWecExJUHADKRv vPTjHdUnH7TnQ== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4NhQdN1j4Qz9rxF; Tue, 27 Dec 2022 21:06:00 +0100 (CET) In-Reply-To: (Stefan Monnier's message of "Tue, 27 Dec 2022 13:44:43 -0500") Received-SPF: pass client-ip=185.67.36.65; envelope-from=philipk@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:301987 Archived-At: Stefan Monnier writes: > Eli Zaretskii [2022-12-27 20:08:32] wrote: >> Good luck with that! It requires to install Node.js and other stiff, >> which I personally won't touch with a 3-mile pole, and I'm unsure (but >> never bothered to find out) whether free replacements even exist. > > That's the part of Tree-sitter which makes me a bit uneasy. I took a look at an the C grammar, and it doesn't appear to use any fancy Javascript stuff: https://github.com/tree-sitter/tree-sitter-c/blob/0720f9c2af2a97dcd0e9ed90324d1baba68b2849/grammar.js Depending on who or what loads these files, it might be possible to use something nice like quickjs (https://bellard.org/quickjs/) to generate the intermediate C files. The documentation at https://tree-sitter.github.io/tree-sitter/creating-parsers indicates that the tree-sitter toolchain is written in Rust (yet another build-time dependency), but unless I am mistaken, it just invokes "node" https://github.com/tree-sitter/tree-sitter/blob/9866674cf87fcd1cd7e424eecdbf260f8947a784/cli/src/generate/mod.rs#L169 and pipes this file https://github.com/tree-sitter/tree-sitter/blob/master/cli/src/generate/dsl.js into the process. The output of this script is JSON, and it seems like pretty vanilla Javascript. If I manage to build QuickJS, I'll try and see if this can be used to process a grammar. The remaining part that generates the C code is written in Rust, and translates the JSON output into C: https://github.com/tree-sitter/tree-sitter/blob/9866674cf87fcd1cd7e424eecdbf260f8947a784/cli/src/generate/mod.rs#L116 and https://github.com/tree-sitter/tree-sitter/blob/9866674cf87fcd1cd7e424eecdbf260f8947a784/cli/src/generate/render.rs#L95 It should be possible to port this, but I question if it is worth the effort. As Stefan said, it really looks like something that distributions should take care of -- though considering that Emacs isn't the first editor with TreeSitter support, I wonder why this hasn't happened yet.