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

   1 ;;; company-dabbrev-code.el --- a dabbrev-like company-mode back-end for code
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company 0.3.1.
   6 ;;
   7 ;; This program is free software; you can redistribute it and/or
   8 ;; modify it under the terms of the GNU General Public License
   9 ;; as published by the Free Software Foundation; either version 2
  10 ;; of the License, or (at your option) any later version.
  11 ;;
  12 ;; This program is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16 ;;
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 (require 'company)
  21 (eval-when-compile (require 'cl))
  22
  23 (defcustom company-dabbrev-code-modes
  24   '(asm-mode batch-file-mode c++-mode c-mode cperl-mode csharp-mode css-mode
  25     emacs-lisp-mode erlang-mode espresso-mode f90-mode fortran-mode
  26     haskell-mode java-mode javascript-mode jde-mode js2-mode lisp-mode
  27     lua-mode objc-mode perl-mode php-mode python-mode ruby-mode scheme-mode
  28     shell-script-mode)
  29   "*Modes that use `company-dabbrev-code'.
  30 In all these modes `company-dabbrev-code' will complete only symbols, not text
  31 in comments or strings.  In other modes `company-dabbrev-code' will pass control
  32 to other back-ends \(e.g. `company-dabbrev'\).
  33 Value t means complete in all modes."
  34   :group 'company
  35   :type '(choice (repeat (symbol :tag "Major mode"))
  36                  (const tag "All modes" t)))
  37
  38 (defcustom company-dabbrev-code-other-buffers .5
  39   "*Determines whether `company-dabbrev-code' should search other buffers.
  40 If t, search all buffers with the same major-mode.  A numeric value means
  41 search other buffers for that many seconds and then return."
  42   :group 'company
  43   :type '(choice (const :tag "Off" nil)
  44                  (const :tag "Same major mode" t)
  45                  (number :tag "Seconds")))
  46
  47 (defmacro company-dabrev-code--time-limit-while (test start limit &rest body)
  48   (declare (indent 3) (debug t))
  49   `(let ((company-time-limit-while-counter 0))
  50      (catch 'done
  51        (while ,test
  52          ,@body
  53          (and ,limit
  54               (eq (incf company-time-limit-while-counter) 25)
  55               (setq company-time-limit-while-counter 0)
  56               (> (float-time (time-since ,start)) ,limit)
  57               (throw 'done 'company-time-out))))))
  58
  59 (defsubst company-dabbrev-code--make-regexp (prefix)
  60   (concat "\\_<" (if (equal prefix "")
  61                      "\\([a-zA-Z]\\|\\s_\\)"
  62                    (regexp-quote prefix))
  63           "\\(\\sw\\|\\s_\\)*\\_>"))
  64
  65 (defun company-dabbrev-code--buffer-symbols (prefix pos &optional symbols
  66                                              start limit)
  67   (save-excursion
  68     (goto-char (point-min))
  69     (let ((regexp (company-dabbrev-code--make-regexp prefix))
  70           match)
  71       (company-dabrev-code--time-limit-while (re-search-forward regexp nil t)
  72           start limit
  73         (setq match (match-string-no-properties 0))
  74         (if (company-in-string-or-comment)
  75             (re-search-forward "\\s>\\|\\s!\\|\\s\"" nil t)
  76           (unless (eq (match-end 0) pos) ;; ignore match before point
  77             (push match symbols))))
  78       symbols)))
  79
  80 (defun company-dabbrev-code--symbols (prefix &optional limit)
  81   (let ((start (current-time))
  82         (symbols (company-dabbrev-code--buffer-symbols prefix (point))))
  83     (dolist (buffer (delq (current-buffer) (buffer-list)))
  84       (and (eq (buffer-local-value 'major-mode buffer) major-mode)
  85            (with-current-buffer buffer
  86              (setq symbols
  87                    (company-dabbrev-code--buffer-symbols prefix nil symbols
  88                                                          start limit))))
  89       (and limit
  90            (> (float-time (time-since start)) limit)
  91            (return)))
  92     symbols))
  93
  94 ;;;###autoload
  95 (defun company-dabbrev-code (command &optional arg &rest ignored)
  96   "A dabbrev-like `company-mode' back-end for code.
  97 The back-end looks for all symbols in the current buffer that aren't in
  98 comments or strings."
  99   (interactive (list 'interactive))
 100   (case command
 101     ('interactive (company-begin-backend 'company-dabbrev-code))
 102     ('prefix (and (or (eq t company-dabbrev-code-modes)
 103                       (apply 'derived-mode-p company-dabbrev-code-modes))
 104                   (not (company-in-string-or-comment))
 105                   (or (company-grab-symbol) 'stop)))
 106     ('candidates (let ((case-fold-search nil))
 107                    (if company-dabbrev-code-other-buffers
 108                        (company-dabbrev-code--symbols
 109                         arg
 110                         (when (numberp company-dabbrev-code-other-buffers)
 111                           company-dabbrev-code-other-buffers))
 112                      (company-dabbrev-code--buffer-symbols arg (point)))))
 113     ('duplicates t)))
 114
 115 (provide 'company-dabbrev-code)
 116 ;;; company-dabbrev-code.el ends here