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yasnippet.el: Use derived-mode-all-parents when available

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This allows YASnippet to obey `derived-mode-add-parents`, which should
become the standard way to indicate "loose" relationships (such as
the fact that `js3-mode` is related to `js-mode` or for TS modes).

* yasnippet.el (yas--merge-ordered-lists, yas--all-parents): New functions.
(yas--modes-to-activate): Use them.
This commit is contained in:
Stefan Monnier 2024-01-04 15:13:51 -05:00
parent bd2fdc8f7d
commit ae36504a5f
1 changed files with 53 additions and 26 deletions
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79
yasnippet.el
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@ -132,8 +132,7 @@
;;; Code:
(require 'cl-lib)
(require 'eldoc) ; Needed for 24.
(declare-function cl-progv-after "cl-extra") ; Needed for 23.4.
(require 'eldoc) ; Needed for Emacs<25.
(require 'easymenu)
(require 'help-mode)
@ -773,7 +772,7 @@ ensure your use `make-local-variable' when you set it.")
"A hash table of mode symbols to `yas--table' objects.")
(defvar yas--parents (make-hash-table)
"A hash table of mode symbols do lists of direct parent mode symbols.
"A hash table of mode symbols to lists of direct parent mode symbols.
This list is populated when reading the \".yas-parents\" files
found when traversing snippet directories with
@ -805,31 +804,59 @@ which decides on the snippet to expand.")
yas--direct-keymaps))
yas--tables))
(defalias 'yas--merge-ordered-lists
(if (fboundp 'merge-ordered-lists) ;Emacs≥30.
#'merge-ordered-lists
(lambda (lists)
(setq lists (delq nil lists))
(if (null (cdr lists)) (car lists) ;Common case.
(delete-dups (apply #'append
;; Prevent sharing the tail.
(append lists '(()) )))))))
(defun yas--all-parents (mode)
"Like `derived-mode-all-parents' but obeying `yas--parents'."
(or (get mode 'yas--all-parents) ;; FIXME: Use `with-memoization'?
(progn
(put mode 'yas--all-parents (list mode)) ;; Stop inf-loop with cycles.
(put mode 'yas--all-parents
(if (fboundp 'derived-mode-all-parents)
(let* ((ap (derived-mode-all-parents mode))
(extras
(mapcar (lambda (parent)
(yas--merge-ordered-lists
(mapcar #'yas--all-parents
(gethash parent yas--parents))))
ap)))
(yas--merge-ordered-lists
(cons (append ap '(fundamental-mode)) extras)))
(cons mode
(yas--merge-ordered-lists
(mapcar #'yas--all-parents
(remq nil
`(,(or (get mode 'derived-mode-parent)
;; Consider `fundamental-mode'
;; as ultimate ancestor.
'fundamental-mode)
,(let ((alias (symbol-function mode)))
(when (symbolp alias) alias))
,@(gethash mode yas--parents)))))))))))
(defun yas--modes-to-activate (&optional mode)
"Compute list of mode symbols that are active for `yas-expand' and friends."
(defvar yas--dfs) ;We rely on dynbind. We could use `letrec' instead!
(let* ((explored (if mode (list mode) ; Building up list in reverse.
(cons major-mode (reverse yas--extra-modes))))
(yas--dfs
(lambda (mode)
(cl-loop for neighbour
;; FIXME: Use `derived-mode-all-parents'.
in (cl-list* (or (get mode 'derived-mode-parent)
;; Consider `fundamental-mode'
;; as ultimate ancestor.
'fundamental-mode)
(symbol-function mode)
(and (boundp 'major-mode-remap-alist)
(car (rassq mode
major-mode-remap-alist)))
(gethash mode yas--parents))
when (and neighbour
(not (memq neighbour explored))
(symbolp neighbour))
do (push neighbour explored)
(funcall yas--dfs neighbour)))))
(mapc yas--dfs explored)
(nreverse explored)))
(let* ((modes
(delete-dups
(remq nil `(,(or mode major-mode)
;; FIXME: Alternative major modes should use
;; `derived-mode-add-parents', but until that
;; becomes common, use `major-mode-remap-alist'
;; as a crutch to supplement the mode hierarchy.
,(and (boundp 'major-mode-remap-alist)
(car (rassq (or mode major-mode)
major-mode-remap-alist)))
,@(unless mode (reverse yas--extra-modes)))))))
(yas--merge-ordered-lists
(mapcar #'yas--all-parents modes))))
(defvar yas-minor-mode-hook nil
"Hook run when `yas-minor-mode' is turned on.")