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Don’t attempt to modify constant conses
From a patch privately suggested by Mattias Engdegård on 2020-05-11 in a followup to Bug#40671. * admin/charsets/cp51932.awk: * admin/charsets/eucjp-ms.awk: Generate code that does not modify constant conses. * doc/misc/emacs-mime.texi (Encoding Customization): * lisp/emacs-lisp/byte-opt.el (byte-compile-side-effect-free-ops): * lisp/frameset.el (frameset-persistent-filter-alist): * lisp/gnus/gnus-sum.el (gnus-article-mode-line-format-alist): Use append instead of nconc. * lisp/language/japanese.el (japanese-ucs-cp932-to-jis-map) (jisx0213-to-unicode): Use mapcar instead of mapc. * lisp/language/lao-util.el (lao-transcription-consonant-alist) (lao-transcription-vowel-alist): * lisp/language/tibetan.el (tibetan-subjoined-transcription-alist): Use copy-sequence. * test/src/fns-tests.el (fns-tests-nreverse): (fns-tests-sort, fns-tests-collate-sort) (fns-tests-string-version-lessp, fns-tests-mapcan): Use copy-sequence, vector, and list.
This commit is contained in:
Paul Eggert
parent
a6ebca21b3
commit
c7bc28bf03
@ -43,13 +43,14 @@ BEGIN {
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END {
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print ")))";
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print " (mapc #'(lambda (x)";
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print " (setcar x (decode-char 'japanese-jisx0208 (car x))))";
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print " map)";
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print " (setq map (mapcar (lambda (x)";
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print " (cons (decode-char 'japanese-jisx0208 (car x))";
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print " (cdr x)))";
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print " map))";
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print " (define-translation-table 'cp51932-decode map)";
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print " (mapc #'(lambda (x)";
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print " (let ((tmp (car x)))";
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print " (setcar x (cdr x)) (setcdr x tmp)))";
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print " (mapc (lambda (x)";
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print " (let ((tmp (car x)))";
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print " (setcar x (cdr x)) (setcdr x tmp)))";
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print " map)";
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print " (define-translation-table 'cp51932-encode map))";
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print "";
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@ -93,15 +93,17 @@ function write_entry (unicode) {
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END {
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print ")))";
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print " (mapc #'(lambda (x)";
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print " (setq map";
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print " (mapcar";
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print " (lambda (x)";
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print " (let ((code (logand (car x) #x7F7F)))";
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print " (if (integerp (cdr x))";
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print " (setcar x (decode-char 'japanese-jisx0208 code))";
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print " (setcar x (decode-char 'japanese-jisx0212 code))";
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print " (setcdr x (cadr x)))))";
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print " map)";
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print " (cons (decode-char 'japanese-jisx0208 code) (cdr x))";
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print " (cons (decode-char 'japanese-jisx0212 code)"
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print " (cadr x)))))";
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print " map))";
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print " (define-translation-table 'eucjp-ms-decode map)";
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print " (mapc #'(lambda (x)";
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print " (mapc (lambda (x)";
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print " (let ((tmp (car x)))";
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print " (setcar x (cdr x)) (setcdr x tmp)))";
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print " map)";
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@ -917,7 +917,7 @@ Here's an example:
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@lisp
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(add-to-list 'gnus-newsgroup-variables 'mm-coding-system-priorities)
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(setq gnus-parameters
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(nconc
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(append
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;; Some charsets are just examples!
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'(("^cn\\." ;; Chinese
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(mm-coding-system-priorities
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@ -1509,7 +1509,7 @@
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byte-current-buffer byte-stack-ref))
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(defconst byte-compile-side-effect-free-ops
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(nconc
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(append
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'(byte-varref byte-nth byte-memq byte-car byte-cdr byte-length byte-aref
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byte-symbol-value byte-get byte-concat2 byte-concat3 byte-sub1 byte-add1
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byte-eqlsign byte-gtr byte-lss byte-leq byte-geq byte-diff byte-negate
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@ -396,17 +396,17 @@ Properties can be set with
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;; or, if you're only changing a few items,
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;;
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;; (defvar my-filter-alist
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;; (nconc '((my-param1 . :never)
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;; (my-param2 . my-filtering-function))
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;; frameset-filter-alist)
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;; (append '((my-param1 . :never)
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;; (my-param2 . my-filtering-function))
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;; frameset-filter-alist)
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;; "My brief customized parameter filter alist.")
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;;
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;; and pass it to the FILTER arg of the save/restore functions,
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;; ALWAYS taking care of not modifying the original lists; if you're
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;; going to do any modifying of my-filter-alist, please use
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;;
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;; (nconc '((my-param1 . :never) ...)
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;; (copy-sequence frameset-filter-alist))
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;; (append '((my-param1 . :never) ...)
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;; (copy-sequence frameset-filter-alist))
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;;
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;; One thing you shouldn't forget is that they are alists, so searching
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;; in them is sequential. If you just want to change the default of
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@ -445,7 +445,7 @@ DO NOT MODIFY. See `frameset-filter-alist' for a full description.")
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;;;###autoload
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(defvar frameset-persistent-filter-alist
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(nconc
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(append
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'((background-color . frameset-filter-sanitize-color)
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(buffer-list . :never)
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(buffer-predicate . :never)
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@ -1501,9 +1501,9 @@ the type of the variable (string, integer, character, etc).")
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;; This is here rather than in gnus-art for compilation reasons.
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(defvar gnus-article-mode-line-format-alist
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(nconc '((?w (gnus-article-wash-status) ?s)
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(?m (gnus-article-mime-part-status) ?s))
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gnus-summary-mode-line-format-alist))
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(append '((?w (gnus-article-wash-status) ?s)
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(?m (gnus-article-mime-part-status) ?s))
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gnus-summary-mode-line-format-alist))
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(defvar gnus-last-search-regexp nil
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"Default regexp for article search command.")
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@ -82,9 +82,7 @@
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(#x00A6 . #xFFE4) ; BROKEN LINE FULLWIDTH BROKEN LINE
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)))
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(define-translation-table 'japanese-ucs-jis-to-cp932-map map)
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(mapc #'(lambda (x) (let ((tmp (car x)))
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(setcar x (cdr x)) (setcdr x tmp)))
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map)
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(setq map (mapcar (lambda (x) (cons (cdr x) (car x))) map))
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(define-translation-table 'japanese-ucs-cp932-to-jis-map map))
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;; U+2014 (EM DASH) vs U+2015 (HORIZONTAL BAR)
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@ -241,8 +239,10 @@ eucJP-ms is defined in <http://www.opengroup.or.jp/jvc/cde/appendix.html>."
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(#x2b65 . [#x02E9 #x02E5])
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(#x2b66 . [#x02E5 #x02E9])))
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table)
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(dolist (elt map)
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(setcar elt (decode-char 'japanese-jisx0213-1 (car elt))))
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(setq map
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(mapcar (lambda (x) (cons (decode-char 'japanese-jisx0213-1 (car x))
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(cdr x)))
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map))
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(setq table (make-translation-table-from-alist map))
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(define-translation-table 'jisx0213-to-unicode table)
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(define-translation-table 'unicode-to-jisx0213
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@ -183,7 +183,9 @@
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;; Semi-vowel-sign-lo and lower vowels are put under the letter.
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(defconst lao-transcription-consonant-alist
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(sort '(;; single consonants
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(sort
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(copy-sequence
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'(;; single consonants
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("k" . "ກ")
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("kh" . "ຂ")
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("qh" . "ຄ")
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@ -223,14 +225,16 @@
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("hy" . ["ຫຍ"])
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("hn" . ["ຫນ"])
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("hm" . ["ຫມ"])
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)
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(function (lambda (x y) (> (length (car x)) (length (car y)))))))
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))
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(lambda (x y) (> (length (car x)) (length (car y))))))
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(defconst lao-transcription-semi-vowel-alist
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'(("r" . "ຼ")))
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(defconst lao-transcription-vowel-alist
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(sort '(("a" . "ະ")
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(sort
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(copy-sequence
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'(("a" . "ະ")
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("ar" . "າ")
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("i" . "ິ")
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("ii" . "ີ")
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@ -257,8 +261,8 @@
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("ai" . "ໄ")
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("ei" . "ໃ")
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("ao" . ["ເົາ"])
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("aM" . "ຳ"))
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(function (lambda (x y) (> (length (car x)) (length (car y)))))))
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("aM" . "ຳ")))
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(lambda (x y) (> (length (car x)) (length (car y))))))
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;; Maa-sakod is put at the tail.
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(defconst lao-transcription-maa-sakod-alist
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@ -326,7 +326,9 @@
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(defconst tibetan-subjoined-transcription-alist
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(sort '(("+k" . "ྐ")
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(sort
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(copy-sequence
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'(("+k" . "ྐ")
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("+kh" . "ྑ")
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("+g" . "ྒ")
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("+gh" . "ྒྷ")
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@ -371,8 +373,8 @@
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("+W" . "ྺ") ;; fixed form subscribed WA
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("+Y" . "ྻ") ;; fixed form subscribed YA
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("+R" . "ྼ") ;; fixed form subscribed RA
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)
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(lambda (x y) (> (length (car x)) (length (car y))))))
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))
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(lambda (x y) (> (length (car x)) (length (car y))))))
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;;;
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;;; alist for Tibetan base consonant <-> subjoined consonant conversion.
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@ -49,21 +49,21 @@
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(should-error (nreverse))
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(should-error (nreverse 1))
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(should-error (nreverse (make-char-table 'foo)))
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(should (equal (nreverse "xyzzy") "yzzyx"))
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(let ((A []))
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(should (equal (nreverse (copy-sequence "xyzzy")) "yzzyx"))
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(let ((A (vector)))
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(nreverse A)
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(should (equal A [])))
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(let ((A [0]))
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(let ((A (vector 0)))
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(nreverse A)
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(should (equal A [0])))
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(let ((A [1 2 3 4]))
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(let ((A (vector 1 2 3 4)))
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(nreverse A)
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(should (equal A [4 3 2 1])))
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(let ((A [1 2 3 4]))
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(let ((A (vector 1 2 3 4)))
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(nreverse A)
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(nreverse A)
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(should (equal A [1 2 3 4])))
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(let* ((A [1 2 3 4])
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(let* ((A (vector 1 2 3 4))
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(B (nreverse (nreverse A))))
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(should (equal A B))))
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@ -146,13 +146,13 @@
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;; Invalid UTF-8 sequences shall be indicated. How to create such strings?
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(ert-deftest fns-tests-sort ()
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(should (equal (sort '(9 5 2 -1 5 3 8 7 4) (lambda (x y) (< x y)))
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(should (equal (sort (list 9 5 2 -1 5 3 8 7 4) (lambda (x y) (< x y)))
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'(-1 2 3 4 5 5 7 8 9)))
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(should (equal (sort '(9 5 2 -1 5 3 8 7 4) (lambda (x y) (> x y)))
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(should (equal (sort (list 9 5 2 -1 5 3 8 7 4) (lambda (x y) (> x y)))
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'(9 8 7 5 5 4 3 2 -1)))
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(should (equal (sort '[9 5 2 -1 5 3 8 7 4] (lambda (x y) (< x y)))
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(should (equal (sort (vector 9 5 2 -1 5 3 8 7 4) (lambda (x y) (< x y)))
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[-1 2 3 4 5 5 7 8 9]))
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(should (equal (sort '[9 5 2 -1 5 3 8 7 4] (lambda (x y) (> x y)))
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(should (equal (sort (vector 9 5 2 -1 5 3 8 7 4) (lambda (x y) (> x y)))
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[9 8 7 5 5 4 3 2 -1]))
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(should (equal
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(sort
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@ -172,7 +172,7 @@
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;; Punctuation and whitespace characters are relevant for POSIX.
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(should
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(equal
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(sort '("11" "12" "1 1" "1 2" "1.1" "1.2")
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(sort (list "11" "12" "1 1" "1 2" "1.1" "1.2")
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(lambda (a b) (string-collate-lessp a b "POSIX")))
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'("1 1" "1 2" "1.1" "1.2" "11" "12")))
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;; Punctuation and whitespace characters are not taken into account
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@ -180,7 +180,7 @@
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(when (eq system-type 'windows-nt)
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(should
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(equal
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(sort '("11" "12" "1 1" "1 2" "1.1" "1.2")
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(sort (list "11" "12" "1 1" "1 2" "1.1" "1.2")
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(lambda (a b)
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(let ((w32-collate-ignore-punctuation t))
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(string-collate-lessp
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@ -190,7 +190,7 @@
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;; Diacritics are different letters for POSIX, they sort lexicographical.
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(should
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(equal
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(sort '("Ævar" "Agustín" "Adrian" "Eli")
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(sort (list "Ævar" "Agustín" "Adrian" "Eli")
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(lambda (a b) (string-collate-lessp a b "POSIX")))
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'("Adrian" "Agustín" "Eli" "Ævar")))
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;; Diacritics are sorted between similar letters for other locales,
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@ -198,7 +198,7 @@
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(when (eq system-type 'windows-nt)
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(should
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(equal
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(sort '("Ævar" "Agustín" "Adrian" "Eli")
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(sort (list "Ævar" "Agustín" "Adrian" "Eli")
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(lambda (a b)
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(let ((w32-collate-ignore-punctuation t))
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(string-collate-lessp
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@ -212,7 +212,7 @@
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(should (not (string-version-lessp "foo20000.png" "foo12.png")))
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(should (string-version-lessp "foo.png" "foo2.png"))
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(should (not (string-version-lessp "foo2.png" "foo.png")))
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(should (equal (sort '("foo12.png" "foo2.png" "foo1.png")
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(should (equal (sort (list "foo12.png" "foo2.png" "foo1.png")
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'string-version-lessp)
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'("foo1.png" "foo2.png" "foo12.png")))
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(should (string-version-lessp "foo2" "foo1234"))
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@ -432,9 +432,9 @@
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(should-error (mapcan))
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(should-error (mapcan #'identity))
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(should-error (mapcan #'identity (make-char-table 'foo)))
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(should (equal (mapcan #'list '(1 2 3)) '(1 2 3)))
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(should (equal (mapcan #'list (list 1 2 3)) '(1 2 3)))
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;; `mapcan' is destructive
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(let ((data '((foo) (bar))))
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(let ((data (list (list 'foo) (list 'bar))))
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(should (equal (mapcan #'identity data) '(foo bar)))
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(should (equal data '((foo bar) (bar))))))
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