about summary refs log tree commit diff
path: root/configs/shared/emacs/.emacs.d/elpa/company-20180913.805/company-semantic.el
blob: 2f6fe2afbc9e65618342a16865bef8e9be08f481 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
;;; company-semantic.el --- company-mode completion backend using Semantic

;; Copyright (C) 2009-2011, 2013-2016  Free Software Foundation, Inc.

;; Author: Nikolaj Schumacher

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.


;;; Commentary:
;;

;;; Code:

(require 'company)
(require 'company-template)
(require 'cl-lib)

(defvar semantic-idle-summary-function)
(declare-function semantic-documentation-for-tag "semantic/doc" )
(declare-function semantic-analyze-current-context "semantic/analyze")
(declare-function semantic-analyze-possible-completions "semantic/complete")
(declare-function semantic-analyze-find-tags-by-prefix "semantic/analyze/fcn")
(declare-function semantic-tag-class "semantic/tag")
(declare-function semantic-tag-name "semantic/tag")
(declare-function semantic-tag-start "semantic/tag")
(declare-function semantic-tag-buffer "semantic/tag")
(declare-function semantic-active-p "semantic")
(declare-function semantic-format-tag-prototype "semantic/format")

(defgroup company-semantic nil
  "Completion backend using Semantic."
  :group 'company)

(defcustom company-semantic-metadata-function 'company-semantic-summary-and-doc
  "The function turning a semantic tag into doc information."
  :type 'function)

(defcustom company-semantic-begin-after-member-access t
  "When non-nil, automatic completion will start whenever the current
symbol is preceded by \".\", \"->\" or \"::\", ignoring
`company-minimum-prefix-length'.

If `company-begin-commands' is a list, it should include `c-electric-lt-gt'
and `c-electric-colon', for automatic completion right after \">\" and
\":\"."
  :type 'boolean)

(defcustom company-semantic-insert-arguments t
  "When non-nil, insert function arguments as a template after completion."
  :type 'boolean
  :package-version '(company . "0.9.0"))

(defvar company-semantic-modes '(c-mode c++-mode jde-mode java-mode))

(defvar-local company-semantic--current-tags nil
  "Tags for the current context.")

(defun company-semantic-documentation-for-tag (tag)
  (when (semantic-tag-buffer tag)
    ;; When TAG's buffer is unknown, the function below raises an error.
    (semantic-documentation-for-tag tag)))

(defun company-semantic-doc-or-summary (tag)
  (or (company-semantic-documentation-for-tag tag)
      (and (require 'semantic-idle nil t)
           (require 'semantic/idle nil t)
           (funcall semantic-idle-summary-function tag nil t))))

(defun company-semantic-summary-and-doc (tag)
  (let ((doc (company-semantic-documentation-for-tag tag))
        (summary (funcall semantic-idle-summary-function tag nil t)))
    (and (stringp doc)
         (string-match "\n*\\(.*\\)$" doc)
         (setq doc (match-string 1 doc)))
    (concat summary
            (when doc
                  (if (< (+ (length doc) (length summary) 4) (window-width))
                      " -- "
                    "\n"))
            doc)))

(defun company-semantic-doc-buffer (tag)
  (let ((doc (company-semantic-documentation-for-tag tag)))
    (when doc
      (company-doc-buffer
       (concat (funcall semantic-idle-summary-function tag nil t)
               "\n"
               doc)))))

(defsubst company-semantic-completions (prefix)
  (ignore-errors
    (let ((completion-ignore-case nil)
          (context (semantic-analyze-current-context)))
      (setq company-semantic--current-tags
            (semantic-analyze-possible-completions context 'no-unique))
      (all-completions prefix company-semantic--current-tags))))

(defun company-semantic-completions-raw (prefix)
  (setq company-semantic--current-tags nil)
  (dolist (tag (semantic-analyze-find-tags-by-prefix prefix))
    (unless (eq (semantic-tag-class tag) 'include)
      (push tag company-semantic--current-tags)))
  (delete "" (mapcar 'semantic-tag-name company-semantic--current-tags)))

(defun company-semantic-annotation (argument tags)
  (let* ((tag (assq argument tags))
         (kind (when tag (elt tag 1))))
    (cl-case kind
      (function (let* ((prototype (semantic-format-tag-prototype tag nil nil))
                       (par-pos (string-match "(" prototype)))
                  (when par-pos (substring prototype par-pos)))))))

(defun company-semantic--prefix ()
  (if company-semantic-begin-after-member-access
      (company-grab-symbol-cons "\\.\\|->\\|::" 2)
    (company-grab-symbol)))

;;;###autoload
(defun company-semantic (command &optional arg &rest ignored)
  "`company-mode' completion backend using CEDET Semantic."
  (interactive (list 'interactive))
  (cl-case command
    (interactive (company-begin-backend 'company-semantic))
    (prefix (and (featurep 'semantic)
                 (semantic-active-p)
                 (memq major-mode company-semantic-modes)
                 (not (company-in-string-or-comment))
                 (or (company-semantic--prefix) 'stop)))
    (candidates (if (and (equal arg "")
                         (not (looking-back "->\\|\\.\\|::" (- (point) 2))))
                    (company-semantic-completions-raw arg)
                  (company-semantic-completions arg)))
    (meta (funcall company-semantic-metadata-function
                   (assoc arg company-semantic--current-tags)))
    (annotation (company-semantic-annotation arg
                                             company-semantic--current-tags))
    (doc-buffer (company-semantic-doc-buffer
                 (assoc arg company-semantic--current-tags)))
    ;; Because "" is an empty context and doesn't return local variables.
    (no-cache (equal arg ""))
    (duplicates t)
    (location (let ((tag (assoc arg company-semantic--current-tags)))
                (when (buffer-live-p (semantic-tag-buffer tag))
                  (cons (semantic-tag-buffer tag)
                        (semantic-tag-start tag)))))
    (post-completion (let ((anno (company-semantic-annotation
                                  arg company-semantic--current-tags)))
                       (when (and company-semantic-insert-arguments anno)
                         (insert anno)
                         (company-template-c-like-templatify (concat arg anno)))
                       ))))

(provide 'company-semantic)
;;; company-semantic.el ends here