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 0.4.3.
   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 (or (require 'semantic-ia nil t)
  22     (require 'semantic/ia))
  23 (eval-when-compile (require 'cl))
  24
  25 (defcustom company-semantic-metadata-function 'company-semantic-summary-and-doc
  26   "*The function turning a semantic tag into doc information."
  27   :group 'company
  28   :type 'function)
  29
  30 (defvar company-semantic-modes '(c-mode c++-mode jde-mode java-mode))
  31
  32 (defvar company-semantic--current-tags nil
  33   "Tags for the current context")
  34
  35 (defun company-semantic-doc-or-summary (tag)
  36   (or (semantic-documentation-for-tag tag)
  37       (funcall semantic-idle-summary-function tag nil t)))
  38
  39 (defun company-semantic-summary-and-doc (tag)
  40   (let ((doc (semantic-documentation-for-tag tag))
  41         (summary (funcall semantic-idle-summary-function tag nil t)))
  42     (and (stringp doc)
  43          (string-match "\n*\\(.*\\)$" doc)
  44          (setq doc (match-string 1 doc)))
  45     (concat (funcall semantic-idle-summary-function tag nil t)
  46             (when doc
  47                   (if (< (+ (length doc) (length summary) 4) (window-width))
  48                       " -- "
  49                     "\n"))
  50             doc)))
  51
  52 (defun company-semantic-doc-buffer (tag)
  53   (let ((doc (semantic-documentation-for-tag tag)))
  54     (when doc
  55       (with-current-buffer (company-doc-buffer)
  56         (insert (funcall semantic-idle-summary-function tag nil t)
  57                 "\n"
  58                 doc)
  59         (current-buffer)))))
  60
  61 (defsubst company-semantic-completions (prefix)
  62   (ignore-errors
  63     (let ((completion-ignore-case nil)
  64           (context (semantic-analyze-current-context)))
  65       (setq company-semantic--current-tags
  66             (semantic-ia-get-completions context (point)))
  67       (all-completions prefix company-semantic--current-tags))))
  68
  69 (defun company-semantic-completions-raw (prefix)
  70   (setq company-semantic--current-tags nil)
  71   (dolist (tag (semantic-analyze-find-tags-by-prefix prefix))
  72     (unless (eq (semantic-tag-class tag) 'include)
  73       (push tag company-semantic--current-tags)))
  74   (delete "" (mapcar 'semantic-tag-name company-semantic--current-tags)))
  75
  76 (defun company-semantic--pre-prefix-length (prefix-length)
  77   "Sum up the length of all chained symbols before POS.
  78 Symbols are chained by \".\" or \"->\"."
  79   (save-excursion
  80     (let ((pos (point)))
  81       (goto-char (- (point) prefix-length))
  82       (while (looking-back "->\\|\\.")
  83         (goto-char (match-beginning 0))
  84         (skip-syntax-backward "w_"))
  85       (- pos (point)))))
  86
  87 (defun company-semantic--grab ()
  88   "Grab the semantic prefix, but return everything before -> or . as length."
  89   (let ((symbol (company-grab-symbol)))
  90     (when symbol
  91       (cons symbol (company-semantic--pre-prefix-length (length symbol))))))
  92
  93 ;;;###autoload
  94 (defun company-semantic (command &optional arg &rest ignored)
  95   "A `company-mode' completion back-end using CEDET Semantic."
  96   (interactive (list 'interactive))
  97   (case command
  98     ('interactive (company-begin-backend 'company-semantic))
  99     ('prefix (and (memq major-mode company-semantic-modes)
 100                   (semantic-active-p)
 101                   (not (company-in-string-or-comment))
 102                   (or (company-semantic--grab) 'stop)))
 103     ('candidates (if (and (equal arg "")
 104                           (not (looking-back "->\\|\\.")))
 105                      (company-semantic-completions-raw arg)
 106                    (company-semantic-completions arg)))
 107     ('meta (funcall company-semantic-metadata-function
 108                     (assoc arg company-semantic--current-tags)))
 109     ('doc-buffer (company-semantic-doc-buffer
 110                   (assoc arg company-semantic--current-tags)))
 111     ;; because "" is an empty context and doesn't return local variables
 112     ('no-cache (equal arg ""))
 113     ('location (let ((tag (assoc arg company-semantic--current-tags)))
 114                  (when (buffer-live-p (semantic-tag-buffer tag))
 115                    (cons (semantic-tag-buffer tag)
 116                          (semantic-tag-start tag)))))))
 117
 118 (provide 'company-semantic)
 119 ;;; company-semantic.el ends here