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