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;;; semantic/db-mode.el --- Semanticdb Minor Mode -*- lexical-binding: t; -*-
;; Copyright (C) 2008-2025 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Major mode for managing Semantic Databases automatically.
;;; Code:
(require 'semantic/db)
(declare-function semantic-lex-spp-set-dynamic-table "semantic/lex-spp")
;;; Start/Stop database use
;;
(defvar semanticdb-hooks
'((semanticdb-semantic-init-hook-fcn semantic-init-db-hook)
(semanticdb-synchronize-table semantic-after-toplevel-cache-change-hook)
(semanticdb-partial-synchronize-table semantic-after-partial-cache-change-hook)
(semanticdb-revert-hook before-revert-hook)
(semanticdb-kill-hook kill-buffer-hook)
(semanticdb-kill-hook change-major-mode-hook) ;; Not really a kill, but we need the same effect.
(semanticdb-kill-emacs-hook kill-emacs-hook)
)
"List of hooks and values to add/remove when configuring semanticdb.")
;;; SEMANTICDB-MODE
;;
;;;###autoload
(defun semanticdb-minor-mode-p ()
"Return non-nil if `semanticdb-minor-mode' is active."
(member (car (car semanticdb-hooks))
(symbol-value (car (cdr (car semanticdb-hooks))))))
(defvaralias 'semanticdb-mode-hook 'global-semanticdb-minor-mode-hook)
(defvaralias 'semanticdb-global-mode 'global-semanticdb-minor-mode)
;;;###autoload
(define-minor-mode global-semanticdb-minor-mode
"Toggle Semantic DB mode.
In Semantic DB mode, Semantic parsers store results in a
database, which can be saved for future Emacs sessions."
:global t
:group 'semantic
(if global-semanticdb-minor-mode
;; Enable
(dolist (elt semanticdb-hooks)
(add-hook (cadr elt) (car elt)))
;; Disable
(dolist (elt semanticdb-hooks)
(remove-hook (cadr elt) (car elt)))))
(defun semanticdb-toggle-global-mode ()
"Toggle use of the Semantic Database feature.
Update the environment of Semantic enabled buffers accordingly."
(interactive)
(if (semanticdb-minor-mode-p)
;; Save databases before disabling semanticdb.
(semanticdb-save-all-db))
;; Toggle semanticdb minor mode.
(global-semanticdb-minor-mode 'toggle))
;;; Hook Functions:
;;
;; Functions used in hooks to keep SemanticDB operating.
;;
(defun semanticdb-semantic-init-hook-fcn ()
"Function saved in `semantic-init-db-hook'.
Sets up the semanticdb environment."
;; Only initialize semanticdb if we have a file name.
;; There is no reason to cache a tag table if there is no
;; way to load it back in later.
(when (buffer-file-name)
(let* ((ans (semanticdb-create-table-for-file (buffer-file-name)))
(cdb (car ans))
(ctbl (cdr ans))
)
;; Get the current DB for this directory
(setq semanticdb-current-database cdb)
;; We set the major mode because we know what it is.
(oset ctbl major-mode major-mode)
;; Local state
(setq semanticdb-current-table ctbl)
(oset ctbl buffer (current-buffer))
;; Try to swap in saved tags
(if (or (not (slot-boundp ctbl 'tags)) (not (oref ctbl tags))
(/= (or (oref ctbl pointmax) 0) (point-max))
)
(semantic-clear-toplevel-cache)
;; Unmatched syntax
(condition-case nil
(semantic-set-unmatched-syntax-cache
(oref ctbl unmatched-syntax))
(unbound-slot
;; Old version of the semanticdb table can miss the unmatched
;; syntax slot. If so, just clear the unmatched syntax cache.
(semantic-clear-unmatched-syntax-cache)
;; Make sure it has a value.
(oset ctbl unmatched-syntax nil)
))
;; Keep lexical tables up to date. Don't load
;; semantic-spp if it isn't needed.
(let ((lt (oref ctbl lexical-table)))
(when lt
(require 'semantic/lex-spp)
(semantic-lex-spp-set-dynamic-table lt)))
;; Set the main tag cache.
;; This must happen after setting up buffer local variables
;; since this will turn around and re-save those variables.
(semantic--set-buffer-cache (oref ctbl tags))
;; Don't need it to be dirty. Set dirty due to hooks from above.
(oset ctbl dirty nil) ;; Special case here.
;; Bind into the buffer.
(semantic--tag-link-cache-to-buffer)
)
)))
(defun semanticdb-revert-hook ()
"Hook run before a revert buffer.
We can't track incremental changes due to a revert, so just clear the cache.
This will prevent the next batch of hooks from wasting time parsing things
that don't need to be parsed."
(if (and (semantic-active-p)
semantic--buffer-cache
semanticdb-current-table)
(semantic-clear-toplevel-cache)))
(defun semanticdb-kill-hook ()
"Function run when a buffer is killed.
If there is a semantic cache, slurp out the overlays, and store
it in our database. If that buffer has no cache, ignore it, we'll
handle it later if need be."
(when (and (semantic-active-p)
semantic--buffer-cache
semanticdb-current-table)
;; Try to get a fast update.
(semantic-fetch-tags-fast)
;; If the buffer is in a bad state, don't save anything...
(if (semantic-parse-tree-needs-rebuild-p)
;; If this is the case, don't save anything.
(progn
(semantic-clear-toplevel-cache)
(oset semanticdb-current-table pointmax 0)
(oset semanticdb-current-table fsize 0)
(oset semanticdb-current-table lastmodtime nil)
)
;; We have a clean buffer, save it off.
(condition-case nil
(progn
(semantic--tag-unlink-cache-from-buffer)
;; Set pointmax only if we had some success in the unlink.
(oset semanticdb-current-table pointmax (point-max))
(let ((fattr (file-attributes
(semanticdb-full-filename
semanticdb-current-table))))
(oset semanticdb-current-table fsize (file-attribute-size fattr))
(oset semanticdb-current-table lastmodtime
(file-attribute-modification-time fattr))
(oset semanticdb-current-table buffer nil)
))
;; If this messes up, just clear the system
(error
(semantic-clear-toplevel-cache)
(message "semanticdb: Failed to deoverlay tag cache.")))
)
))
(defun semanticdb-kill-emacs-hook ()
"Function called when Emacs is killed.
Save all the databases."
(semanticdb-save-all-db))
;;; SYNCHRONIZATION HOOKS
;;
(defun semanticdb-synchronize-table (new-table)
"Function run after parsing.
Argument NEW-TABLE is the new table of tags."
(when semanticdb-current-table
(semanticdb-synchronize semanticdb-current-table new-table)))
(defun semanticdb-partial-synchronize-table (new-table)
"Function run after parsing.
Argument NEW-TABLE is the new table of tags."
(when semanticdb-current-table
(semanticdb-partial-synchronize semanticdb-current-table new-table)))
(provide 'semantic/db-mode)
;; Local variables:
;; generated-autoload-file: "loaddefs.el"
;; generated-autoload-load-name: "semantic/db-mode"
;; End:
;;; semantic/db-mode.el ends here
|
