147 lines
5.6 KiB
EmacsLisp
147 lines
5.6 KiB
EmacsLisp
;;; company-semantic.el --- company-mode completion back-end using Semantic
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;; Copyright (C) 2009-2011, 2013 Free Software Foundation, Inc.
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;; Author: Nikolaj Schumacher
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(require 'company)
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(require 'cl-lib)
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(defvar semantic-idle-summary-function)
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(declare-function semantic-documentation-for-tag "semantic/doc" )
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(declare-function semantic-analyze-current-context "semantic/analyze")
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(declare-function semantic-analyze-possible-completions "semantic/complete")
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(declare-function semantic-analyze-find-tags-by-prefix "semantic/analyze/fcn")
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(declare-function semantic-tag-class "semantic/tag")
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(declare-function semantic-tag-name "semantic/tag")
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(declare-function semantic-tag-start "semantic/tag")
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(declare-function semantic-tag-buffer "semantic/tag")
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(declare-function semantic-active-p "semantic")
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(defgroup company-semantic nil
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"Completion back-end using Semantic."
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:group 'company)
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(defcustom company-semantic-metadata-function 'company-semantic-summary-and-doc
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"The function turning a semantic tag into doc information."
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:type 'function)
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(defvar company-semantic-modes '(c-mode c++-mode jde-mode java-mode))
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(defvar-local company-semantic--current-tags nil
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"Tags for the current context.")
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(defun company-semantic-documentation-for-tag (tag)
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(when (semantic-tag-buffer tag)
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;; When TAG's buffer is unknown, the function below raises an error.
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(semantic-documentation-for-tag tag)))
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(defun company-semantic-doc-or-summary (tag)
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(or (company-semantic-documentation-for-tag tag)
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(and (require 'semantic-idle nil t)
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(require 'semantic/idle nil t)
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(funcall semantic-idle-summary-function tag nil t))))
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(defun company-semantic-summary-and-doc (tag)
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(let ((doc (company-semantic-documentation-for-tag tag))
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(summary (funcall semantic-idle-summary-function tag nil t)))
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(and (stringp doc)
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(string-match "\n*\\(.*\\)$" doc)
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(setq doc (match-string 1 doc)))
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(concat summary
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(when doc
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(if (< (+ (length doc) (length summary) 4) (window-width))
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" -- "
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"\n"))
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doc)))
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(defun company-semantic-doc-buffer (tag)
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(let ((doc (company-semantic-documentation-for-tag tag)))
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(when doc
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(company-doc-buffer
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(concat (funcall semantic-idle-summary-function tag nil t)
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"\n"
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doc)))))
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(defsubst company-semantic-completions (prefix)
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(ignore-errors
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(let ((completion-ignore-case nil)
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(context (semantic-analyze-current-context)))
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(setq company-semantic--current-tags
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(semantic-analyze-possible-completions context))
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(all-completions prefix company-semantic--current-tags))))
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(defun company-semantic-completions-raw (prefix)
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(setq company-semantic--current-tags nil)
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(dolist (tag (semantic-analyze-find-tags-by-prefix prefix))
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(unless (eq (semantic-tag-class tag) 'include)
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(push tag company-semantic--current-tags)))
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(delete "" (mapcar 'semantic-tag-name company-semantic--current-tags)))
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(defun company-semantic--pre-prefix-length (prefix-length)
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"Sum up the length of all chained symbols before POS.
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Symbols are chained by \".\" or \"->\"."
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(save-excursion
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(let ((pos (point)))
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(goto-char (- (point) prefix-length))
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(while (looking-back "->\\|\\.")
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(goto-char (match-beginning 0))
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(skip-syntax-backward "w_"))
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(- pos (point)))))
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(defun company-semantic--grab ()
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"Grab the semantic prefix, but return everything before -> or . as length."
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(let ((symbol (company-grab-symbol)))
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(when symbol
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(cons symbol (company-semantic--pre-prefix-length (length symbol))))))
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;;;###autoload
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(defun company-semantic (command &optional arg &rest ignored)
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"`company-mode' completion back-end using CEDET Semantic."
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(interactive (list 'interactive))
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(cl-case command
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(interactive (company-begin-backend 'company-semantic))
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(prefix (and (featurep 'semantic)
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(semantic-active-p)
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(memq major-mode company-semantic-modes)
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(not (company-in-string-or-comment))
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(or (company-semantic--grab) 'stop)))
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(candidates (if (and (equal arg "")
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(not (looking-back "->\\|\\.")))
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(company-semantic-completions-raw arg)
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(company-semantic-completions arg)))
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(meta (funcall company-semantic-metadata-function
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(assoc arg company-semantic--current-tags)))
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(doc-buffer (company-semantic-doc-buffer
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(assoc arg company-semantic--current-tags)))
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;; Because "" is an empty context and doesn't return local variables.
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(no-cache (equal arg ""))
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(location (let ((tag (assoc arg company-semantic--current-tags)))
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(when (buffer-live-p (semantic-tag-buffer tag))
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(cons (semantic-tag-buffer tag)
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(semantic-tag-start tag)))))))
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(provide 'company-semantic)
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;;; company-semantic.el ends here
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