1 ;;; company-dabbrev.el --- dabbrev-like company-mode completion back-end -*- lexical-binding: t -*-
3 ;; Copyright (C) 2009, 2011, 2014 Free Software Foundation, Inc.
5 ;; Author: Nikolaj Schumacher
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software: you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation, either version 3 of the License, or
12 ;; (at your option) any later version.
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
31 (defgroup company-dabbrev nil
32 "dabbrev-like completion back-end."
35 (defcustom company-dabbrev-other-buffers 'all
36 "Determines whether `company-dabbrev' should search other buffers.
37 If `all', search all other buffers. If t, search buffers with the same
39 See also `company-dabbrev-time-limit'."
40 :type '(choice (const :tag "Off" nil)
41 (const :tag "Same major mode" t)
42 (const :tag "All" all)))
44 (defcustom company-dabbrev-time-limit .1
45 "Determines how many seconds `company-dabbrev' should look for matches."
46 :type '(choice (const :tag "Off" nil)
47 (number :tag "Seconds")))
49 (defcustom company-dabbrev-char-regexp "\\sw"
50 "A regular expression matching the characters `company-dabbrev' looks for."
53 (defcustom company-dabbrev-ignore-case 'keep-prefix
54 "The value of `ignore-case' returned by `company-dabbrev'.")
56 (defcustom company-dabbrev-downcase 'case-replace
57 "Whether to downcase the returned candidates.
59 The value of nil means keep them as-is.
60 `case-replace' means use the value of `case-replace'.
61 Any other value means downcase.
63 If you set this value to nil, you may also want to set
64 `company-dabbrev-ignore-case' to any value other than `keep-prefix'.")
66 (defcustom company-dabbrev-minimum-length (1+ company-minimum-prefix-length)
67 "The minimum length for the string to be included."
70 (defmacro company-dabrev--time-limit-while (test start limit &rest body)
71 (declare (indent 3) (debug t))
72 `(let ((company-time-limit-while-counter 0))
77 (eq (cl-incf company-time-limit-while-counter) 25)
78 (setq company-time-limit-while-counter 0)
79 (> (float-time (time-since ,start)) ,limit)
80 (throw 'done 'company-time-out))))))
82 (defsubst company-dabbrev--make-regexp (prefix)
83 (concat "\\<" (if (equal prefix "")
84 company-dabbrev-char-regexp
85 (regexp-quote prefix))
86 "\\(" company-dabbrev-char-regexp "\\)*\\>"))
88 (defun company-dabbrev--search-buffer (regexp pos symbols start limit
92 (goto-char (if pos (1- pos) (point-min)))
94 (company-dabrev--time-limit-while (re-search-backward regexp nil t)
96 (setq match (match-string-no-properties 0))
97 (if (and ignore-comments (company-in-string-or-comment))
98 (goto-char (nth 8 (syntax-ppss)))
99 (when (>= (length match) company-dabbrev-minimum-length)
100 (push match symbols))))
101 (goto-char (or pos (point-min)))
103 (company-dabrev--time-limit-while (re-search-forward regexp nil t)
105 (setq match (match-string-no-properties 0))
106 (if (and ignore-comments (company-in-string-or-comment))
107 (re-search-forward "\\s>\\|\\s!\\|\\s\"" nil t)
108 (when (>= (length match) company-dabbrev-minimum-length)
109 (push match symbols))))
112 (defun company-dabbrev--search (regexp &optional limit other-buffer-modes
114 (let* ((start (current-time))
115 (symbols (company-dabbrev--search-buffer regexp (point) nil start limit
117 (when other-buffer-modes
118 (cl-dolist (buffer (delq (current-buffer) (buffer-list)))
119 (with-current-buffer buffer
120 (when (or (eq other-buffer-modes 'all)
121 (apply #'derived-mode-p other-buffer-modes))
123 (company-dabbrev--search-buffer regexp nil symbols start
124 limit ignore-comments))))
126 (> (float-time (time-since start)) limit)
131 (defun company-dabbrev (command &optional arg &rest ignored)
132 "dabbrev-like `company-mode' completion back-end."
133 (interactive (list 'interactive))
135 (interactive (company-begin-backend 'company-dabbrev))
136 (prefix (company-grab-word))
138 (let ((words (company-dabbrev--search (company-dabbrev--make-regexp arg)
139 company-dabbrev-time-limit
140 (pcase company-dabbrev-other-buffers
141 (`t (list major-mode))
143 (downcase-p (if (eq company-dabbrev-downcase 'case-replace)
145 company-dabbrev-downcase)))
147 (mapcar 'downcase words)
149 (ignore-case company-dabbrev-ignore-case)
152 (provide 'company-dabbrev)
153 ;;; company-dabbrev.el ends here