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+;;; company-semantic.el --- company-mode completion backend using Semantic
+
+;; Copyright (C) 2009-2011, 2013-2018  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 <https://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