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;;; 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
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