code.delx.au - gnu-emacs-elpa/blob - company-dabbrev.el

   1 ;;; company-dabbrev.el --- dabbrev-like company-mode completion back-end  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2009, 2011, 2014  Free Software Foundation, Inc.
   4
   5 ;; Author: Nikolaj Schumacher
   6
   7 ;; This file is part of GNU Emacs.
   8
   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.
  13
  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.
  18
  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/>.
  21
  22
  23 ;;; Commentary:
  24 ;;
  25
  26 ;;; Code:
  27
  28 (require 'company)
  29 (require 'cl-lib)
  30
  31 (defgroup company-dabbrev nil
  32   "dabbrev-like completion back-end."
  33   :group 'company)
  34
  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
  38 major mode.
  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)))
  43
  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")))
  48
  49 (defcustom company-dabbrev-char-regexp "\\sw"
  50   "A regular expression matching the characters `company-dabbrev' looks for."
  51   :type 'regexp)
  52
  53 (defcustom company-dabbrev-ignore-case 'keep-prefix
  54   "Non-nil to ignore case when collecting completion candidates.
  55 When it's `keep-prefix', the text before point will remain unchanged after
  56 candidate is inserted, even some of its characters have different case.")
  57
  58 (defcustom company-dabbrev-downcase 'case-replace
  59   "Whether to downcase the returned candidates.
  60
  61 The value of nil means keep them as-is.
  62 `case-replace' means use the value of `case-replace'.
  63 Any other value means downcase.
  64
  65 If you set this value to nil, you may also want to set
  66 `company-dabbrev-ignore-case' to any value other than `keep-prefix'.")
  67
  68 (defcustom company-dabbrev-minimum-length 4
  69   "The minimum length for the completion candidate to be included.
  70 This variable affects both `company-dabbrev' and `company-dabbrev-code'."
  71   :type 'integer
  72   :package-version '(company . "0.8.3"))
  73
  74 (defmacro company-dabrev--time-limit-while (test start limit &rest body)
  75   (declare (indent 3) (debug t))
  76   `(let ((company-time-limit-while-counter 0))
  77      (catch 'done
  78        (while ,test
  79          ,@body
  80          (and ,limit
  81               (eq (cl-incf company-time-limit-while-counter) 25)
  82               (setq company-time-limit-while-counter 0)
  83               (> (float-time (time-since ,start)) ,limit)
  84               (throw 'done 'company-time-out))))))
  85
  86 (defsubst company-dabbrev--make-regexp (prefix)
  87   (concat "\\<" (if (equal prefix "")
  88               company-dabbrev-char-regexp
  89             (regexp-quote prefix))
  90           "\\(" company-dabbrev-char-regexp "\\)*\\>"))
  91
  92 (defun company-dabbrev--search-buffer (regexp pos symbols start limit
  93                                        ignore-comments)
  94   (save-excursion
  95     (let (match)
  96       (goto-char (if pos (1- pos) (point-min)))
  97       ;; search before pos
  98       (company-dabrev--time-limit-while (re-search-backward regexp nil t)
  99           start limit
 100         (setq match (match-string-no-properties 0))
 101         (if (and ignore-comments (company-in-string-or-comment))
 102             (goto-char (nth 8 (syntax-ppss)))
 103           (when (>= (length match) company-dabbrev-minimum-length)
 104             (push match symbols))))
 105       (goto-char (or pos (point-min)))
 106       ;; search after pos
 107       (company-dabrev--time-limit-while (re-search-forward regexp nil t)
 108           start limit
 109         (setq match (match-string-no-properties 0))
 110         (if (and ignore-comments (company-in-string-or-comment))
 111             (re-search-forward "\\s>\\|\\s!\\|\\s\"" nil t)
 112           (when (>= (length match) company-dabbrev-minimum-length)
 113             (push match symbols))))
 114       symbols)))
 115
 116 (defun company-dabbrev--search (regexp &optional limit other-buffer-modes
 117                                 ignore-comments)
 118   (let* ((start (current-time))
 119          (symbols (company-dabbrev--search-buffer regexp (point) nil start limit
 120                                                   ignore-comments)))
 121     (when other-buffer-modes
 122       (cl-dolist (buffer (delq (current-buffer) (buffer-list)))
 123         (with-current-buffer buffer
 124           (when (or (eq other-buffer-modes 'all)
 125                     (apply #'derived-mode-p other-buffer-modes))
 126             (setq symbols
 127                   (company-dabbrev--search-buffer regexp nil symbols start
 128                                                   limit ignore-comments))))
 129         (and limit
 130              (> (float-time (time-since start)) limit)
 131              (cl-return))))
 132     symbols))
 133
 134 ;;;###autoload
 135 (defun company-dabbrev (command &optional arg &rest ignored)
 136   "dabbrev-like `company-mode' completion back-end."
 137   (interactive (list 'interactive))
 138   (cl-case command
 139     (interactive (company-begin-backend 'company-dabbrev))
 140     (prefix (company-grab-word))
 141     (candidates
 142      (let* ((case-fold-search company-dabbrev-ignore-case)
 143             (words (company-dabbrev--search (company-dabbrev--make-regexp arg)
 144                                             company-dabbrev-time-limit
 145                                             (pcase company-dabbrev-other-buffers
 146                                               (`t (list major-mode))
 147                                               (`all `all))))
 148             (downcase-p (if (eq company-dabbrev-downcase 'case-replace)
 149                             case-replace
 150                           company-dabbrev-downcase)))
 151        (if downcase-p
 152            (mapcar 'downcase words)
 153          words)))
 154     (ignore-case company-dabbrev-ignore-case)
 155     (duplicates t)))
 156
 157 (provide 'company-dabbrev)
 158 ;;; company-dabbrev.el ends here