From: Ihor Radchenko <yantar92@posteo.net>
To: "Rudolf Adamkovič" <salutis@me.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Radio links work only in small numbers
Date: Mon, 19 Feb 2024 09:26:17 +0000 [thread overview]
Message-ID: <87a5nwhkjq.fsf@localhost> (raw)
In-Reply-To: <m2lenax5m6.fsf@me.com>
[-- Attachment #1: Type: text/plain, Size: 500 bytes --]
Rudolf Adamkovič <salutis@me.com> writes:
> All [[link]]s in my notes perfectly match LEVEL-1 headings, so I figured
> that I may as well ask Org to make links for me. So, I replaced all the
> ~4000 headings in my notes with radio <<<targets>>>. However, Org now
> errors out with "Regular expression too big".
>
> Does anyone know how to overcome this limitation? Or, perhaps someone
> has a patch in works that fixes it? If so, please let me know!
May you try the attached patch?
[-- Attachment #2: 0001-Work-around-regexp-size-limitation-for-large-number-.patch --]
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From e01f5a56fff7b3a4c9ad016802a4da6a01053e22 Mon Sep 17 00:00:00 2001
Message-ID: <e01f5a56fff7b3a4c9ad016802a4da6a01053e22.1708334729.git.yantar92@posteo.net>
From: Ihor Radchenko <yantar92@posteo.net>
Date: Mon, 19 Feb 2024 12:19:34 +0300
Subject: [PATCH] Work around regexp size limitation for large number of link
targets
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
* lisp/ol.el (org-target-link-regexp-limit): New constant defining
maximum regexp limit where `org-target-link-regexp' is still safe to
use without triggering "Regexp too long" error.
(org-target-link-regexps): New variable holding a series of shorter
regexps to be used instead of too long single
`org-target-link-regexp'.
(org--re-list-search-forward): New function like `re-search-forward',
but accepting a list of regexps.
(org--re-list-looking-at): New function like `looking-at', but
accepting a list of regexps.
(org-update-radio-target-regexp): When `org-target-link-regexp' is too
long, set `org-target-link-regexps', partitioning the link target list
into smaller regexps.
* lisp/org-element.el (org-element-link-parser):
(org-element--object-lex):
* lisp/org.el (org-activate-target-links): Use
`org--re-list-search-forward' and `org--re-list-looking-at' when
`org-target-link-regexps' is non-nil.
* testing/lisp/test-org-element.el (test-org-element/link-parser): Add
tests.
Reported-by: Rudolf Adamkovič <salutis@me.com>
Link: https://list.orgmode.org/orgmode/m2lenax5m6.fsf@me.com/
---
lisp/ol.el | 68 ++++++++++++++++++++++++++++++--
lisp/org-element.el | 16 ++++++--
lisp/org.el | 4 +-
testing/lisp/test-org-element.el | 17 ++++++++
4 files changed, 97 insertions(+), 8 deletions(-)
diff --git a/lisp/ol.el b/lisp/ol.el
index a680c43f3..6842fb8fe 100644
--- a/lisp/ol.el
+++ b/lisp/ol.el
@@ -52,6 +52,7 @@ (declare-function org-before-first-heading-p "org" ())
(declare-function org-do-occur "org" (regexp &optional cleanup))
(declare-function org-element-at-point "org-element" (&optional pom cached-only))
(declare-function org-element-cache-refresh "org-element" (pos))
+(declare-function org-element-cache-reset "org-element" (&optional all no-persistence))
(declare-function org-element-context "org-element" (&optional element))
(declare-function org-element-lineage "org-element-ast" (datum &optional types with-self))
(declare-function org-element-link-parser "org-element" ())
@@ -532,6 +533,13 @@ (defconst org-radio-target-regexp (format "<%s>" org-target-regexp)
(defvar-local org-target-link-regexp nil
"Regular expression matching radio targets in plain text.")
+(defconst org-target-link-regexp-limit (ash 2 15)
+ "Maximum allowed length of regexp.
+See MAX_BUF_SIZE in src/regex-emacs.c")
+(defvar-local org-target-link-regexps nil
+ "List of regular expressions matching radio targets in plain text.
+This list is non-nil, when a single regexp would be too long to match
+all the possible targets, exceeding Emacs' regexp length limit.")
(defvar org-link-types-re nil
"Matches a link that has a url-like prefix like \"http:\".")
@@ -2078,6 +2086,34 @@ (defun org-insert-link-global ()
(org-load-modules-maybe)
(org-run-like-in-org-mode 'org-insert-link))
+(defun org--re-list-search-forward (regexp-list &optional bound noerror count)
+ "Like `re-search-forward', but REGEXP-LIST is a list of regexps.
+BOUND, NOERROR, and COUNT are passed to `re-search-forward'."
+ (let (result (min-found most-positive-fixnum)
+ (pos-found nil)
+ (min-found-data nil)
+ (tail regexp-list))
+ (while tail
+ (setq result (save-excursion (re-search-forward (pop tail) bound t count)))
+ (when (and result (< result min-found))
+ (setq min-found result
+ pos-found (match-end 0)
+ min-found-data (match-data))))
+ (if (= most-positive-fixnum min-found)
+ (pcase noerror
+ (`t nil)
+ (_ (re-search-forward (car regexp-list) bound noerror count)))
+ (set-match-data min-found-data)
+ (goto-char pos-found))))
+
+(defun org--re-list-looking-at (regexp-list &optional inhibit-modify)
+ "Like `looking-at', but REGEXP-LIST is a list of regexps.
+INHIBIT-MODIFY is passed to `looking-at'."
+ (catch :found
+ (while regexp-list
+ (when (looking-at (pop regexp-list) inhibit-modify)
+ (throw :found t)))))
+
;;;###autoload
(defun org-update-radio-target-regexp ()
"Find all radio targets in this file and update the regular expression.
@@ -2115,6 +2151,30 @@ (defun org-update-radio-target-regexp ()
targets
"\\|")
after-re)))
+ (setq org-target-link-regexps nil)
+ (let (current-length sub-targets)
+ (when (<= org-target-link-regexp-limit (length org-target-link-regexp))
+ (while (or targets sub-targets)
+ (when (and sub-targets
+ (or (not targets)
+ (>= (+ current-length (length (car targets)))
+ org-target-link-regexp-limit)))
+ (push (concat before-re
+ (mapconcat
+ (lambda (x)
+ (replace-regexp-in-string
+ " +" "\\s-+" (regexp-quote x) t t))
+ (nreverse sub-targets)
+ "\\|")
+ after-re)
+ org-target-link-regexps)
+ (setq current-length nil
+ sub-targets nil))
+ (unless current-length
+ (setq current-length (+ (length before-re) (length after-re))))
+ (when targets (push (pop targets) sub-targets))
+ (cl-incf current-length (length (car sub-targets))))
+ (setq org-target-link-regexps (nreverse org-target-link-regexps))))
(unless (equal old-regexp org-target-link-regexp)
;; Clean-up cache.
(let ((regexp (cond ((not old-regexp) org-target-link-regexp)
@@ -2130,9 +2190,11 @@ (defun org-update-radio-target-regexp ()
after-re)))))
(when (and (featurep 'org-element)
(not (bound-and-true-p org-mode-loading)))
- (org-with-point-at 1
- (while (re-search-forward regexp nil t)
- (org-element-cache-refresh (match-beginning 1))))))
+ (if org-target-link-regexps
+ (org-element-cache-reset)
+ (org-with-point-at 1
+ (while (re-search-forward regexp nil t)
+ (org-element-cache-refresh (match-beginning 1)))))))
;; Re fontify buffer.
(when (memq 'radio org-highlight-links)
(org-restart-font-lock)))))
diff --git a/lisp/org-element.el b/lisp/org-element.el
index 091059c6c..4ad7fe8c3 100644
--- a/lisp/org-element.el
+++ b/lisp/org-element.el
@@ -3842,7 +3842,9 @@ (defun org-element-link-parser ()
;; Type 1: Text targeted from a radio target.
((and org-target-link-regexp
(save-excursion (or (bolp) (backward-char))
- (looking-at org-target-link-regexp)))
+ (if org-target-link-regexps
+ (org--re-list-looking-at org-target-link-regexps)
+ (looking-at org-target-link-regexp))))
(setq type "radio")
(setq format 'plain)
(setq link-end (match-end 1))
@@ -5215,7 +5217,10 @@ (defun org-element--object-lex (restriction)
((not (memq 'link restriction)) nil)
((progn
(unless (bolp) (forward-char -1))
- (not (re-search-forward org-target-link-regexp nil t)))
+ (not
+ (if org-target-link-regexps
+ (org--re-list-search-forward org-target-link-regexps nil t)
+ (re-search-forward org-target-link-regexp nil t))))
nil)
;; Since we moved backward, we do not want to
;; match again an hypothetical 1-character long
@@ -5224,8 +5229,11 @@ (defun org-element--object-lex (restriction)
;; beginning of line, we prevent this here.
((and (= start (1+ (line-beginning-position)))
(= start (match-end 1)))
- (and (re-search-forward org-target-link-regexp nil t)
- (1+ (match-beginning 1))))
+ (and
+ (if org-target-link-regexps
+ (org--re-list-search-forward org-target-link-regexps nil t)
+ (re-search-forward org-target-link-regexp nil t))
+ (1+ (match-beginning 1))))
(t (1+ (match-beginning 1))))))
found)
(save-excursion
diff --git a/lisp/org.el b/lisp/org.el
index ad2394ae3..0c0376a9e 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -5705,7 +5705,9 @@ (defun org-activate-target-links (limit)
;; `org-target-link-regexp' matches one character before the
;; actual target.
(unless (bolp) (forward-char -1))
- (when (re-search-forward org-target-link-regexp limit t)
+ (when (if org-target-link-regexps
+ (org--re-list-search-forward org-target-link-regexps limit t)
+ (re-search-forward org-target-link-regexp limit t))
(org-remove-flyspell-overlays-in (match-beginning 1) (match-end 1))
(add-text-properties (match-beginning 1) (match-end 1)
(list 'mouse-face 'highlight
diff --git a/testing/lisp/test-org-element.el b/testing/lisp/test-org-element.el
index 93754bae5..61cd70693 100644
--- a/testing/lisp/test-org-element.el
+++ b/testing/lisp/test-org-element.el
@@ -2378,6 +2378,23 @@ (ert-deftest test-org-element/link-parser ()
(org-element-property
:type
(org-element-map (org-element-parse-buffer) 'link #'identity nil t)))))
+ (should
+ (equal
+ "radio"
+ (org-test-with-temp-text "<<<radio>>><<<radio2>>><<<foo>>>A radio link"
+ (org-update-radio-target-regexp)
+ (org-element-property
+ :type
+ (org-element-map (org-element-parse-buffer) 'link #'identity nil t)))))
+ (should
+ (equal
+ "radio"
+ (let ((org-target-link-regexp-limit 9))
+ (org-test-with-temp-text "<<<radio>>><<<radio2>>><<<foo>>>A radio link"
+ (org-update-radio-target-regexp)
+ (org-element-property
+ :type
+ (org-element-map (org-element-parse-buffer) 'link #'identity nil t))))))
;; Pathological case: radio target of length 1 at beginning of line
;; not followed by spaces.
(should
--
2.43.0
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--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
next prev parent reply other threads:[~2024-02-19 9:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-13 23:10 Radio links work only in small numbers Rudolf Adamkovič
2022-12-14 8:30 ` Ihor Radchenko
2022-12-14 15:29 ` Rudolf Adamkovič
2022-12-14 15:47 ` Max Nikulin
2022-12-14 16:02 ` Ihor Radchenko
2022-12-20 3:21 ` Timothy
2022-12-20 1:00 ` Rudolf Adamkovič
2022-12-28 9:46 ` Daniel Clemente
2024-02-19 9:26 ` Ihor Radchenko [this message]
2024-02-28 16:33 ` nobiot
2024-02-28 17:14 ` Ihor Radchenko
2024-02-28 22:18 ` Noboru Ota
2024-02-29 11:11 ` Ihor Radchenko
2024-02-29 16:47 ` Noboru Ota
2024-02-29 17:21 ` Ihor Radchenko
2024-02-29 17:44 ` Noboru Ota
2024-04-04 20:20 ` Rudolf Adamkovič
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