GNU bug report logs - #27552
25.2.50; Indentation problem in rnc-mode

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Package: emacs; Severity: minor; Reported by: Ivan Andrus <darthandrus@HIDDEN>; Keywords: moreinfo; Done: Lars Ingebrigtsen <larsi@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
bug marked as fixed in version 29.1, send any further explanations to 27552 <at> debbugs.gnu.org and Ivan Andrus <darthandrus@HIDDEN> Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#27552: 25.2.50; Indentation problem in rnc-mode
References: <BEC9975E-04D0-431C-B2D4-E7E73A059C79@HIDDEN>
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Date: Wed, 15 Jun 2022 17:56:56 +0200
In-Reply-To: <jwvv8t2ugy1.fsf-monnier+emacs@HIDDEN> (Stefan Monnier's message
 of "Wed, 15 Jun 2022 11:15:28 -0400")
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 Content preview:  Stefan Monnier <monnier@HIDDEN> writes: > Kind of, 
 yes. There are various places where we could try and fix > this problem,
 but this might be the simplest, indeed. > I pushed the patch below which does
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Stefan Monnier <monnier@HIDDEN> writes:

> Kind of, yes.  There are various places where we could try and fix
> this problem, but this might be the simplest, indeed.
> I pushed the patch below which does that.

Thanks; I can confirm that that fixes this issue, so I'm closing this
bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#27552; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#27552: 25.2.50; Indentation problem in rnc-mode
Message-ID: <jwvv8t2ugy1.fsf-monnier+emacs@HIDDEN>
References: <BEC9975E-04D0-431C-B2D4-E7E73A059C79@HIDDEN>
 <87k0akhshb.fsf@HIDDEN> <87sfo6gg12.fsf@HIDDEN>
Date: Wed, 15 Jun 2022 11:15:28 -0400
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 15 Jun 2022 16:25:29 +0200")
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Lars Ingebrigtsen [2022-06-15 16:25:29] wrote:
> Lars Ingebrigtsen <larsi@HIDDEN> writes:
>
>> I guess this "=" rule is for stuff like the "pattern =" etc.  But it
>> leads to things like this being indented more for each line:
>>
>> default namesace rng = "http://relaxng.org/ns/structure/1.0"
>> namespace local = ""
>> datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"

Part of the problem is that the grammar we use is incorrect, so we
parse incorrectly, and we have to patch things up in the indentation
rules :-(

> Or...  is the problem here that we don't end pattern with a newline?

Kind of, yes.  There are various places where we could try and fix
this problem, but this might be the simplest, indeed.
I pushed the patch below which does that.


        Stefan


diff --git a/rnc-mode.el b/rnc-mode.el
index 30f3c39970..33363d2057 100644
--- a/rnc-mode.el
+++ b/rnc-mode.el
@@ -1,6 +1,6 @@
 ;;; rnc-mode.el --- Emacs mode to edit Relax-NG Compact files  -*- lexical-binding:t -*-
 
-;; Copyright (C) 1994-1998, 2001-2016 Free Software Foundation, Inc.
+;; Copyright (C) 1994-1998, 2001-2022 Free Software Foundation, Inc.
 
 ;; Author: Stefan Monnier <monnier@HIDDEN>
 ;; Keywords: xml relaxng
@@ -96,11 +96,18 @@
     '((assoc "," "&" "|") (nonassoc "?" "*" "+"))
     )))
 
+(defconst rnc-smie--def-regexp
+  (concat "\\(?:\\(?:namespace\\|datatypes\\)[ \t\n]+\\)?"
+          "\\(?:\\s_\\|\\sw\\)+[ \t\n]*[|&]?=")
+  "Regexp matching a \"definition\".
+Any line that starts with this is presumed to start a new definition,
+so the preceding newline is turned into an implicit \" ; \" token.")
+
 (defun rnc-smie-forward-token ()
   (let ((start (point)))
     (forward-comment (point-max))
     (if (and (> (point) start)
-             (looking-at "\\(?:\\s_\\|\\sw\\)+[ \t\n]*[|&]?=")
+             (looking-at rnc-smie--def-regexp)
              (save-excursion
                (goto-char start)
                (forward-comment -1)
@@ -120,7 +127,7 @@
              (let ((pos (point)))
                (goto-char start)
                (prog1
-                   (looking-at "\\(?:\\s_\\|\\sw\\)+[ \t\n]*[|&]?=")
+                   (looking-at rnc-smie--def-regexp)
                  (goto-char pos))))
         " ; "
       (if (looking-back "\\s." (1- (point)))
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#27552; Package emacs. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Ivan Andrus <darthandrus@HIDDEN>
Subject: Re: bug#27552: 25.2.50; Indentation problem in rnc-mode
References: <BEC9975E-04D0-431C-B2D4-E7E73A059C79@HIDDEN>
 <87k0akhshb.fsf@HIDDEN>
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 "=" rule is for stuff like the "pattern =" etc. But it > leads to things like
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 "http://relaxng.org/ns/structure/1.0" > [...] 
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Lars Ingebrigtsen <larsi@HIDDEN> writes:

> I guess this "=" rule is for stuff like the "pattern =" etc.  But it
> leads to things like this being indented more for each line:
>
> default namesace rng = "http://relaxng.org/ns/structure/1.0"
> namespace local = ""
> datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"

Or...  is the problem here that we don't end pattern with a newline?
Because the "assignment" ends at the newline in this case.

  (smie-prec2->grammar
   (smie-bnf->prec2
    '((id) (atom) (args)
      (header (header "include" atom))
      (decls (id "=" pattern) (id "|=" pattern) (id "&=" pattern)
             (decls " ; " decls))
      (pattern ("element" args) ("attribute" args)
               ("list" args) ("mixed" args)
               ("parent" id) ("external" id)
               ("grammar" atom)
	       ("{" pattern "}")
	       (pattern "," pattern)
	       (pattern "&" pattern)
	       (pattern "|" pattern)
	       (pattern "?")
	       (pattern "*")
	       (pattern "+")))


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#27552; Package emacs. Full text available.
Added tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Ivan Andrus <darthandrus@HIDDEN>
Subject: Re: bug#27552: 25.2.50; Indentation problem in rnc-mode
References: <BEC9975E-04D0-431C-B2D4-E7E73A059C79@HIDDEN>
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Date: Tue, 17 May 2022 21:25:04 +0200
In-Reply-To: <BEC9975E-04D0-431C-B2D4-E7E73A059C79@HIDDEN> (Ivan Andrus's
 message of "Sat, 1 Jul 2017 14:33:59 -0600")
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 Content preview: Ivan Andrus <darthandrus@HIDDEN> writes: > The RNC snippet
 below (from > http://cs.brown.edu/courses/cs196-9/slidestore/relaxng.html)
 shows an > indentation problem when using multiple opening namespace/datatypes
 > clauses. > > -Ivan > > def [...] 
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Ivan Andrus <darthandrus@HIDDEN> writes:

> The RNC snippet below (from
> http://cs.brown.edu/courses/cs196-9/slidestore/relaxng.html) shows an
> indentation problem when using multiple opening namespace/datatypes
> clauses.
>
> -Ivan
>
> default namespace rng = "http://relaxng.org/ns/structure/1.0"
>                             namespace local = ""
>                                                   datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"
>
> start = pattern
>
> pattern =
>     element element { (nameQName | nameClass), (common & pattern+) }
>     | element attribute { (nameQName | nameClass), (common & pattern?) }
>     | element group|interleave|choice|optional


(defun rnc-smie-rules (kind token)
  (pcase (cons kind token)
    (`(:list-intro . "element") t)
    (`(:elem . empty-line-token) " ; ")
    (`(:before . ,(or "include" "default" "namespace" "datatypes")) 0)
[...]
    (`(:after . ,(or "=" "|=" "&=")) smie-indent-basic)

I guess this "=" rule is for stuff like the "pattern =" etc.  But it
leads to things like this being indented more for each line:

default namesace rng = "http://relaxng.org/ns/structure/1.0"
namespace local = ""
datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"

I betcha this is easy to express in smie, but I have no idea how, so
I've added Stefan to the CCs.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#27552; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: 25.2.50; Indentation problem in rnc-mode
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The RNC snippet below (from
http://cs.brown.edu/courses/cs196-9/slidestore/relaxng.html) shows an
indentation problem when using multiple opening namespace/datatypes
clauses.

-Ivan

default namespace rng =3D "http://relaxng.org/ns/structure/1.0"
                            namespace local =3D ""
                                                  datatypes xsd =3D =
"http://www.w3.org/2001/XMLSchema-datatypes"

start =3D pattern

pattern =3D
    element element { (nameQName | nameClass), (common & pattern+) }
    | element attribute { (nameQName | nameClass), (common & pattern?) }
    | element group|interleave|choice|optional
              |zeroOrMore|oneOrMore|list|mixed { common & pattern+ }
    | element ref|parentRef { nameNCName, common }
    | element empty|notAllowed|text { common }
    | element data { type, param*, (common & exceptPattern?) }
    | element value { commonAttributes, type?, xsd:string }
    | element externalRef { href, common }
    | element grammar { common & grammarContent* }



In GNU Emacs 25.2.50.5 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 =
Version 10.11.6 (Build 15G1421))
of 2017-06-28 built on iandrus-osx
Repository revision: efe7a7f79f8eb9c716136561821d350b69456b55
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --without-makeinfo PKG_CONFIG_PATH=3D/opt/X11/lib/pkgconfig'

Configured features:
JPEG RSVG DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: RNC

Minor modes in effect:
  achievements-mode: t
  highlight-symbol-mode: t
  which-function-mode: t
  show-paren-mode: t
  global-semantic-stickyfunc-mode: t
  save-place-mode: t
  msb-mode: t
  minibuffer-depth-indicate-mode: t
  gud-tooltip-mode: t
  global-hl-line-mode: t
  delete-selection-mode: t
  guide-key-mode: t
  auto-insert-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  ido-everywhere: t
  beacon-mode: t
  global-page-break-lines-mode: t
  gvol-mode: t
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  TeX-PDF-mode: t
  global-edit-server-edit-mode: t
  auto-image-file-mode: t
  desktop-save-mode: t
  drag-stuff-global-mode: t
  drag-stuff-mode: t
  recentf-mode: t
  global-anzu-mode: t
  anzu-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
Acknowledgement sent to Ivan Andrus <darthandrus@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#27552; Package emacs. Full text available.
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