-;;; company-clang.el --- A company-mode completion back-end for clang
+;;; company-clang.el --- company-mode completion back-end for Clang
;; Copyright (C) 2009, 2011, 2013 Free Software Foundation, Inc.
;;; Code:
(require 'company)
+(require 'company-template)
(eval-when-compile (require 'cl))
+(defgroup company-clang nil
+ "Completion back-end for Clang."
+ :group 'company)
+
(defcustom company-clang-executable
(executable-find "clang")
"Location of clang executable."
- :group 'company-clang
:type 'file)
-(defcustom company-clang-auto-save t
- "Determines whether to save the buffer when retrieving completions.
-clang can only complete correctly when the buffer has been saved."
- :group 'company-clang
- :type '(choice (const :tag "Off" nil)
- (const :tag "On" t)))
+(defcustom company-clang-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
+\":\".")
(defcustom company-clang-arguments nil
"Additional arguments to pass to clang when completing.
-Prefix files (-include ...) can be selected with
-`company-clang-set-prefix' or automatically through a custom
-`company-clang-prefix-guesser'."
- :group 'company-clang
+Prefix files (-include ...) can be selected with `company-clang-set-prefix'
+or automatically through a custom `company-clang-prefix-guesser'."
:type '(repeat (string :tag "Argument" nil)))
(defcustom company-clang-prefix-guesser 'company-clang-guess-prefix
"A function to determine the prefix file for the current buffer."
- :group 'company-clang
:type '(function :tag "Guesser function" nil))
-(defvar company-clang-modes '(c-mode objc-mode)
+(defvar company-clang-modes '(c-mode c++-mode objc-mode)
"Major modes which clang may complete.")
;; prefix ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; parsing ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; TODO: How to handle OVERLOAD and Pattern?
+;; TODO: Handle Pattern (syntactic hints would be neat).
+;; Do we ever see OVERLOAD (or OVERRIDE)?
(defconst company-clang--completion-pattern
- "^COMPLETION: \\_<\\(%s[a-zA-Z0-9_:]*\\)\\(?: : \\(.*\\)$\\)?")
+ "^COMPLETION: \\_<\\(%s[a-zA-Z0-9_:]*\\)\\(?: : \\(.*\\)$\\)?$")
(defconst company-clang--error-buffer-name "*clang error*")
(defvar company-clang--meta-cache nil)
-(defun company-clang--parse-output (prefix)
+(defun company-clang--lang-option ()
+ (if (eq major-mode 'objc-mode)
+ (if (string= "m" (file-name-extension buffer-file-name))
+ "objective-c" "objective-c++")
+ (substring (symbol-name major-mode) 0 -5)))
+
+(defun company-clang--parse-output (prefix objc)
(goto-char (point-min))
(let ((pattern (format company-clang--completion-pattern
(regexp-quote prefix)))
(setq company-clang--meta-cache (make-hash-table :test 'equal))
(while (re-search-forward pattern nil t)
(setq match (match-string-no-properties 1))
- (let ((meta (match-string-no-properties 2)))
- (when (and meta (not (string= match meta)))
- (puthash match meta company-clang--meta-cache)))
(unless (equal match "Pattern")
+ (let ((meta (match-string-no-properties 2)))
+ (when (and meta (not (string= match meta)))
+ (setq meta (company-clang--strip-formatting meta))
+ (when (and (not objc) (string-match "\\((.*)\\)" meta))
+ (setq match (concat match (match-string 1 meta))))
+ (puthash match meta company-clang--meta-cache)))
(push match lines)))
lines))
+(defun company-clang--strip-formatting (text)
+ (replace-regexp-in-string
+ "#]" " "
+ (replace-regexp-in-string "[<{[]#\\|#[>}]" "" text t)
+ t))
+
(defun company-clang--handle-error (res args)
(goto-char (point-min))
(let* ((buf (get-buffer-create company-clang--error-buffer-name))
- (cmd (concat company-clang-executable (mapconcat 'identity args " ")))
+ (cmd (concat company-clang-executable " " (mapconcat 'identity args " ")))
(pattern (format company-clang--completion-pattern ""))
(err (if (re-search-forward pattern nil t)
(buffer-substring-no-properties (point-min)
(1- (match-beginning 0)))
- ;; Warn the user more agressively if no match was found.
+ ;; Warn the user more aggressively if no match was found.
(message "clang failed with error %d:\n%s" res cmd)
(buffer-string))))
(goto-char (point-min))))))
(defun company-clang--call-process (prefix &rest args)
- (with-temp-buffer
- (let ((res (apply 'call-process company-clang-executable nil t nil args)))
+ (let ((objc (derived-mode-p 'objc-mode))
+ (buf (get-buffer-create "*clang-output*"))
+ res)
+ (with-current-buffer buf (erase-buffer))
+ (setq res (if (company-clang--auto-save-p)
+ (apply 'call-process company-clang-executable nil buf nil args)
+ (apply 'call-process-region (point-min) (point-max)
+ company-clang-executable nil buf nil args)))
+ (with-current-buffer buf
(unless (eq 0 res)
(company-clang--handle-error res args))
;; Still try to get any useful input.
- (company-clang--parse-output prefix))))
+ (company-clang--parse-output prefix objc))))
(defsubst company-clang--build-location (pos)
(save-excursion
(goto-char pos)
- (format "%s:%d:%d" buffer-file-name (line-number-at-pos)
+ (format "%s:%d:%d"
+ (if (company-clang--auto-save-p) buffer-file-name "-")
+ (line-number-at-pos)
(1+ (current-column)))))
(defsubst company-clang--build-complete-args (pos)
(append '("-cc1" "-fsyntax-only" "-code-completion-macros")
+ (unless (company-clang--auto-save-p)
+ (list "-x" (company-clang--lang-option)))
company-clang-arguments
(when (stringp company-clang--prefix)
(list "-include" (expand-file-name company-clang--prefix)))
'("-code-completion-at")
(list (company-clang--build-location pos))
- (list buffer-file-name)))
+ (list (if (company-clang--auto-save-p) buffer-file-name "-"))))
(defun company-clang--candidates (prefix)
- (and company-clang-auto-save
+ (and (company-clang--auto-save-p)
(buffer-modified-p)
(basic-save-buffer))
(when (null company-clang--prefix)
prefix
(company-clang--build-complete-args (- (point) (length prefix)))))
+(defun company-clang--prefix ()
+ (let ((symbol (company-grab-symbol)))
+ (if symbol
+ (if (and company-clang-begin-after-member-access
+ (save-excursion
+ (forward-char (- (length symbol)))
+ (looking-back "\\.\\|->\\|::" (- (point) 2))))
+ (cons symbol t)
+ symbol)
+ 'stop)))
+
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defconst company-clang-required-version 1.1)
+(defvar company-clang--version nil)
+
+(defun company-clang--auto-save-p ()
+ (< company-clang--version 2.9))
+
(defsubst company-clang-version ()
"Return the version of `company-clang-executable'."
(with-temp-buffer
0)))
(defun company-clang-objc-templatify (selector)
- (let* ((end (point))
+ (let* ((end (point-marker))
(beg (- (point) (length selector)))
- (templ (company-template-declare-template beg end)))
+ (templ (company-template-declare-template beg end))
+ (cnt 0))
(save-excursion
(goto-char beg)
- (while (search-forward ":" end t)
- (replace-match ": ")
- (incf end 2)
- (company-template-add-field templ (1- (match-end 0)) "<arg>"))
- (delete-char -1))
+ (catch 'stop
+ (while (search-forward ":" end t)
+ (company-template-add-field templ (point) (format "arg%d" cnt))
+ (if (< (point) end)
+ (insert " ")
+ (throw 'stop t))
+ (incf cnt))))
(company-template-move-to-first templ)))
(defun company-clang (command &optional arg &rest ignored)
- "A `company-mode' completion back-end for clang.
-Clang is a parser for C and ObjC. The unreleased development version of
-clang (1.1) is required.
+ "`company-mode' completion back-end for Clang.
+Clang is a parser for C and ObjC. Clang version 1.1 or newer is required.
Additional command line arguments can be specified in
`company-clang-arguments'. Prefix files (-include ...) can be selected
with `company-clang-set-prefix' or automatically through a custom
`company-clang-prefix-guesser'.
-Completions only work correctly when the buffer has been saved.
-`company-clang-auto-save' determines whether to do this automatically."
+With Clang versions before 2.9, we have to save the buffer before
+performing completion. With Clang 2.9 and later, buffer contents are
+passed via standard input."
(interactive (list 'interactive))
(case command
(interactive (company-begin-backend 'company-clang))
- (init (unless company-clang-executable
- (error "Company found no clang executable"))
- (when (< (company-clang-version) company-clang-required-version)
- (error "Company requires clang version 1.1")))
+ (init (when (memq major-mode company-clang-modes)
+ (unless company-clang-executable
+ (error "Company found no clang executable"))
+ (setq company-clang--version (company-clang-version))
+ (when (< company-clang--version company-clang-required-version)
+ (error "Company requires clang version 1.1"))))
(prefix (and (memq major-mode company-clang-modes)
buffer-file-name
company-clang-executable
(not (company-in-string-or-comment))
- (or (company-grab-symbol) 'stop)))
+ (company-clang--prefix)))
(candidates (company-clang--candidates arg))
- (meta (let ((meta (gethash arg company-clang--meta-cache)))
- (when meta
- (replace-regexp-in-string
- "#]" " "
- (replace-regexp-in-string "[<{[]#\\|#[>}]" "" meta t)
- t))))
- (post-completion (and (derived-mode-p 'objc-mode)
- (string-match ":" arg)
- (company-clang-objc-templatify arg)))))
+ (meta (gethash arg company-clang--meta-cache))
+ (crop (and (string-match ":\\|(" arg)
+ (substring arg 0 (match-beginning 0))))
+ (post-completion (cond
+ ((not (derived-mode-p 'objc-mode))
+ (company-template-c-like-templatify arg))
+ ((string-match ":" arg)
+ (company-clang-objc-templatify arg))))))
(provide 'company-clang)
;;; company-clang.el ends here