auto-complete for JSX

ac-jsx.el

;;; ac-jsx.el --- auto-complete for JSX

;; Copyright (C) 2012 by Syohei YOSHIDA

;; Author: Syohei YOSHIDA <syohex@gmail.com>
;; URL:

;; This program 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.

;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(eval-when-compile
  (require 'cl))

(require 'json)

(defgroup ac-jsx nil
  "auto-complete for jsx"
  :group 'jsx
  :prefix "ac-jsx:")

(defcustom ac-jsx:function-format "%t\n(%f:%l)\n\n%d"
  "format of function"
  :type  'string
  :group 'jsx)

(defcustom ac-jsx:variable-format "Class: %c\n(%f:%l)"
  "format of variable"
  :type  'string
  :group 'jsx)

(defvar ac-jsx:command (or (and (boundp 'jsx-cmd) jsx-cmd) "jsx"))

(defun ac-jsx:complete-command (tempfile)
  (let ((file (buffer-file-name)))
    (format "%s --input-filename %s --complete %d:%d '%s'"
            ac-jsx:command file
            (line-number-at-pos) (ac-jsx:current-char-number) tempfile)))

(defun ac-jsx:current-char-number ()
  (length (buffer-substring-no-properties
           (line-beginning-position) (1+ (point)))))

(defun ac-jsx:write-temp-file ()
  (let ((temp (concat (make-temp-name "jsx") ".jsx")))
    (let ((str (buffer-substring-no-properties (point-min) (point-max))))
      (with-temp-file temp
        (insert str))
      (expand-file-name temp))))

(defun ac-jsx:decode-json-buffer ()
  (let ((str (buffer-substring-no-properties (point-min) (point-max))))
    (json-read-from-string str)))

(defun ac-jsx:args-to-string (args)
  (mapconcat 'identity
             (loop for arg in args
                   collect (format "%s:%s" (car arg) (cdr arg)))
             " "))

(defun ac-jsx:format-table (compinfo)
  (mapcar (lambda (e)
            (let* ((v (assoc-default (cdr e) compinfo)))
              `(,(car e) . ,(typecase v
                              (number (number-to-string v))
                              (vector (if (zerop (length v))
                                          "void"
                                        (ac-jsx:args-to-string (aref v 0))))
                              (t v)))))
          '(("%a" . args)
            ("%c" . definedClass)
            ("%d" . doc)
            ("%f" . definedFilename)
            ("%l" . definedLineNumber)
            ("%r" . returnType)
            ("%t" . type)
            ("%w" . word))))

(defun ac-jsx:fill-template (tmpl tbl)
  (let ((replaced tmpl)
        (value nil))
    (dolist (pair tbl replaced)
      (setq value (or (cdr pair) ""))
      (setq replaced (replace-regexp-in-string (car pair) value replaced)))))

(defun ac-jsx:format-document (compinfo)
  (let ((tbl (ac-jsx:format-table compinfo))
        (tmpl (if (assoc-default 'args compinfo)
                  ac-jsx:function-format
                ac-jsx:variable-format)))
    (ac-jsx:fill-template tmpl tbl)))

(defun ac-jsx:completion-at-point ()
  (let* ((tempfile (ac-jsx:write-temp-file))
         (cmd (ac-jsx:complete-command tempfile)))
    (with-temp-buffer
      (let (retval)
        (unwind-protect
            (setq retval (call-process-shell-command cmd nil t nil))
          (delete-file tempfile))
        (unless (zerop retval)
          (error (format "Failed: '%s'(ret=%d)" cmd retval))))
      (loop for compinfo across (ac-jsx:decode-json-buffer)
            for word = (assoc-default 'word compinfo)
            for doc  = (ac-jsx:format-document compinfo)
            for menu = (assoc-default 'menu compinfo)
            collect (propertize word 'doc doc)))))

(defun ac-jsx:document (item)
  (get-text-property 0 'doc item))

(defvar ac-source-jsx
  '((candidates . ac-jsx:completion-at-point)
    (document . ac-jsx:document)
    (prefix . "\\(.*\\)")
    (requires . 0))
  "Source for JSX completion")

(add-hook 'jsx-mode-hook (lambda () (add-to-list 'ac-sources 'ac-source-jsx)))

(provide 'ac-jsx)

;;; ac-jsx.el ends here