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

   1 ;;; company-semantic.el --- a company-mode back-end using CEDET Semantic
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company 0.4.1.
   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 (require 'semantic-ia)
  22 (eval-when-compile (require 'cl))
  23
  24 (defcustom company-semantic-metadata-function 'company-semantic-summary-and-doc
  25   "*The function turning a semantic tag into doc information."
  26   :group 'company
  27   :type 'function)
  28
  29 (defun company-semantic-doc-or-summary (tag)
  30   (or (semantic-documentation-for-tag tag)
  31       (funcall semantic-idle-summary-function tag nil t)))
  32
  33 (defun company-semantic-summary-and-doc (tag)
  34   (let ((doc (semantic-documentation-for-tag tag))
  35         (summary (funcall semantic-idle-summary-function tag nil t)))
  36     (and (stringp doc)
  37          (string-match "\n*\\(.*\\)$" doc)
  38          (setq doc (match-string 1 doc)))
  39     (concat (funcall semantic-idle-summary-function tag nil t)
  40             (when doc
  41                   (if (< (+ (length doc) (length summary) 4) (window-width))
  42                       " -- "
  43                     "\n"))
  44             doc)))
  45
  46 (defun company-semantic-doc-buffer (tag)
  47   (let ((doc (semantic-documentation-for-tag tag)))
  48     (when doc
  49       (with-current-buffer (company-doc-buffer)
  50         (insert (funcall semantic-idle-summary-function tag nil t)
  51                 "\n"
  52                 doc)
  53         (current-buffer)))))
  54
  55 (defsubst company-semantic-completions (prefix)
  56   (ignore-errors
  57     (let ((completion-ignore-case nil)
  58           (context (semantic-analyze-current-context)))
  59       (all-completions prefix (semantic-ia-get-completions context (point))))))
  60
  61 (defun company-semantic-completions-raw (prefix)
  62   (let (candidates)
  63     (dolist (tag (semantic-analyze-find-tags-by-prefix prefix))
  64       (unless (eq (semantic-tag-class tag) 'include)
  65         (push (semantic-tag-name tag) candidates)))
  66     (delete "" candidates)))
  67
  68 (defun company-semantic--pre-prefix-length (prefix-length)
  69   "Sum up the length of all chained symbols before POS.
  70 Symbols are chained by \".\" or \"->\"."
  71   (save-excursion
  72     (let ((pos (point)))
  73       (goto-char (- (point) prefix-length))
  74       (while (looking-back "->\\|\\.")
  75         (goto-char (match-beginning 0))
  76         (skip-syntax-backward "w_"))
  77       (- pos (point)))))
  78
  79 (defun company-semantic--grab ()
  80   "Grab the semantic prefix, but return everything before -> or . as length."
  81   (let ((symbol (company-grab-symbol)))
  82     (when symbol
  83       (cons symbol (company-semantic--pre-prefix-length (length symbol))))))
  84
  85 ;;;###autoload
  86 (defun company-semantic (command &optional arg &rest ignored)
  87   "A `company-mode' completion back-end using CEDET Semantic."
  88   (interactive (list 'interactive))
  89   (case command
  90     ('interactive (company-begin-backend 'company-semantic))
  91     ('prefix (and (memq major-mode '(c-mode c++-mode jde-mode java-mode))
  92                   (semantic-active-p)
  93                   (not (company-in-string-or-comment))
  94                   (or (company-semantic--grab) 'stop)))
  95     ('candidates (if (and (equal arg "")
  96                           (not (looking-back "->\\|\\.")))
  97                      (company-semantic-completions-raw arg)
  98                    (company-semantic-completions arg)))
  99     ('meta (funcall company-semantic-metadata-function
 100                     (semantic-analyze-find-tag arg)))
 101     ('doc-buffer (company-semantic-doc-buffer (semantic-analyze-find-tag arg)))
 102     ;; because "" is an empty context and doesn't return local variables
 103     ('no-cache (equal arg ""))
 104     ('location (let ((tag (semantic-analyze-find-tag arg)))
 105                  (when (buffer-live-p (semantic-tag-buffer tag))
 106                    (cons (semantic-tag-buffer tag)
 107                          (semantic-tag-start tag)))))))
 108
 109 (provide 'company-semantic)
 110 ;;; company-semantic.el ends here