From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eduardo Ochs Newsgroups: gmane.emacs.devel Subject: Re: [PATCH] Re: Make peg.el a built-in library? Date: Sun, 5 Feb 2023 12:41:10 -0300 Message-ID: References: <875yvtbbn3.fsf@ericabrahamsen.net> <877d07a16u.fsf@localhost> <87tu3asg2r.fsf@ericabrahamsen.net> <87edud25ov.fsf@localhost> <87a6511ku0.fsf@ericabrahamsen.net> <87wn85z0zl.fsf@ericabrahamsen.net> <87leobplpv.fsf_-_@ericabrahamsen.net> <87o7r5ikpm.fsf@web.de> <87bkn5wl7o.fsf@localhost> <87a62p2v3c.fsf@web.de> <874js0e2jm.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21073"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Michael Heerdegen , emacs-devel@gnu.org To: Ihor Radchenko Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Feb 05 16:41:51 2023 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 1pOh9L-0005J6-AW for ged-emacs-devel@m.gmane-mx.org; Sun, 05 Feb 2023 16:41:51 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pOh91-0006Yr-T1; Sun, 05 Feb 2023 10:41:31 -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 1pOh8v-0006YX-J3 for emacs-devel@gnu.org; Sun, 05 Feb 2023 10:41:25 -0500 Original-Received: from mail-yw1-x1132.google.com ([2607:f8b0:4864:20::1132]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1pOh8t-0004Jb-SP for emacs-devel@gnu.org; Sun, 05 Feb 2023 10:41:25 -0500 Original-Received: by mail-yw1-x1132.google.com with SMTP id 00721157ae682-51ba4b1b9feso129457897b3.11 for ; Sun, 05 Feb 2023 07:41:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=1K30RVtux01IHv28N74IleaOHobQD3vLih0EtZuq3UI=; b=pyVsqXcPE5LYpFO/euXGUmc14dqzBM/g4kvE7ns7yF1pxmB4hf9vPimbmJMzhWZH9q Hl0EZm8x6d6i5wTO7Jl3+A2SqyI5+regjW/ug/tqBu/1rJon8S8BY67CrrZRoy1/ef8Z BO5VlHzcsedTklcHT7MY2ZTpLuM4/Dlrz6wlhSrk/2KOBX1QLnRWkUHsddS1PHqqsa5g 2IUQpEBLgOUp0nG+mCVgJa+6Ei9dtgDVGyw2LOH/f4QJPPkmAQgvSP12fimWudcmUyb8 jasori7Up2uVMteoRNsqqrOoFTqH5OF3f9yhi1tH00UiHzq9Q29pVG0R5bi9d5p0vOCd nPzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=1K30RVtux01IHv28N74IleaOHobQD3vLih0EtZuq3UI=; b=1hkU3B/Xj3ETwDLNZt4i5W5p14B82yoJsyLWRnbpgBvY+mWRR+1J4gWREMlXcuFxh/ A6LiEVIK2sWEF8hQOPAwtYsahjjWnW38db0Uf4kc0QVfcJxYe4ifFPJshPyOVXxfTaFh dsvAfwMMF5V3PLDMHjikQch6Wlwt20cWJDNGqLAvbfg2hW1XBwquI8h4JPYUy58SyopM WpPqCxvvKqLNlYi0F6YqTMzv8jJRm/i6xeLGcEvWvUE4nLotYiMpOfUUobIo7bo6vLC6 PSeLm9nHZo8NMqcsRhmZcboF9YQBFTj6Vi3oPFzmF6iVL7b21Q32Y/vboiIKwKXTyqII O5MQ== X-Gm-Message-State: AO0yUKXgOEktiuSRwqxB935aDG/DiTKO1Y7JdF5dQKJwotFexL54FJlb 6FqndqWJs10d2R1QTlcs+2S+oxnfgA/p8Xuozyo= X-Google-Smtp-Source: AK7set/iw3REBaAF31dfP8zrtF6tjwGJ8EhVMw0gvQ45+ey4ef0AG6/AWdv90MdhTC3Thpw973EC0nKGW6mrw3cljWA= X-Received: by 2002:a81:49d1:0:b0:527:98e6:cd25 with SMTP id w200-20020a8149d1000000b0052798e6cd25mr660553ywa.209.1675611682383; Sun, 05 Feb 2023 07:41:22 -0800 (PST) In-Reply-To: <874js0e2jm.fsf@localhost> Received-SPF: pass client-ip=2607:f8b0:4864:20::1132; envelope-from=eduardoochs@gmail.com; helo=mail-yw1-x1132.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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:303002 Archived-At: On Sun, 5 Feb 2023 at 09:10, Ihor Radchenko wrote: > > Michael Heerdegen writes: > > > Ihor Radchenko writes: > > > >> I am wondering if we may instead just support traditional regexps as an > >> extra PEG construct. Considering that regexp support is anyway built-in, > >> why not? > > > > Dunno. I wrote the translator for academic interest and for > > learning. > > > > AFAIR not all Emacs regexp features work in PEGs - backrefs for example. > > Or match data handling. > > Sure. But if we make Emacs regexp a valid PEG construct, they will work. > It is the whole point. I played a bit with peg.el some time ago - it is very elegant and it's very easy to inspect how it does things, but it is much slower than Lua's LPEG. I'm now using this to write my parsers: https://github.com/edubart/lpegrex https://github.com/edubart/lpegrex/blob/main/parsers/lua.lua The second link above is an example - a parser for Lua written in Lpegrex. I'm starting to use this thing, that lets me run a Lua interpreter inside Emacs as a module, https://github.com/edrx/emlua/#introduction to call lpegrex parsers to parse parts of Emacs buffers. The result - let me call it lpegrex+emlua - is very fragile because I'm too bad & lazy with C programming to implement better error handling in emlua, but if anyone else wants to play with lpegrex+emlua I can create a page with instructions... Cheers, Eduardo Ochs http://anggtwu.net/#eev http://anggtwu.net/eepitch.html