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json-mode.el
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json-mode.el
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;;; json-mode.el --- Major mode for editing JSON files.
;; Copyright (C) 2011-2014 Josh Johnston
;; Author: Josh Johnston
;; URL: https://github.com/joshwnj/json-mode
;; Version: 1.6.0
;; Package-Requires: ((json-reformat "0.0.5") (json-snatcher "1.0.0"))
;; 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:
;; extend the builtin js-mode's syntax highlighting
;;; Code:
(require 'js)
(require 'rx)
(require 'json-snatcher)
(require 'json-reformat)
(defgroup json-mode '()
"Major mode for editing JSON files."
:group 'js)
;;;###autoload
(defconst json-mode-standard-file-ext '(".json" ".jsonld")
"List of JSON file extensions.")
;; This is to be sure the customization is loaded. Otherwise,
;; autoload discards any defun or defcustom.
;;;###autoload
(defsubst json-mode--update-auto-mode (filenames)
"Update the `json-mode' entry of `auto-mode-alist'.
FILENAMES should be a list of file as string.
Return the new `auto-mode-alist' entry"
(let* ((new-regexp
(rx-to-string
`(seq (eval
(cons 'or
(append json-mode-standard-file-ext
',filenames))) eot)))
(new-entry (cons new-regexp 'json-mode))
(old-entry (when (boundp 'json-mode--auto-mode-entry)
json-mode--auto-mode-entry)))
(setq auto-mode-alist (delete old-entry auto-mode-alist))
(add-to-list 'auto-mode-alist new-entry)
new-entry))
;;;###autoload
(defcustom json-mode-auto-mode-list '(
".babelrc"
".bowerrc"
"composer.lock"
)
"List of filename as string to pass for the JSON entry of
`auto-mode-alist'.
Note however that custom `json-mode' entries in `auto-mode-alist'
won’t be affected."
:group 'json-mode
:type '(repeat string)
:set (lambda (symbol value)
"Update SYMBOL with a new regexp made from VALUE.
This function calls `json-mode--update-auto-mode' to change the
`json-mode--auto-mode-entry' entry in `auto-mode-alist'."
(set-default symbol value)
(setq json-mode--auto-mode-entry (json-mode--update-auto-mode value))))
;; Autoload needed to initalize the the `auto-list-mode' entry.
;;;###autoload
(defvar json-mode--auto-mode-entry (json-mode--update-auto-mode json-mode-auto-mode-list)
"Regexp generated from the `json-mode-auto-mode-list'.")
(defconst json-mode-quoted-string-re
(rx (group (char ?\")
(zero-or-more (or (seq ?\\ ?\\)
(seq ?\\ ?\")
(seq ?\\ (not (any ?\" ?\\)))
(not (any ?\" ?\\))))
(char ?\"))))
(defconst json-mode-quoted-key-re
(rx (group (char ?\")
(zero-or-more (or (seq ?\\ ?\\)
(seq ?\\ ?\")
(seq ?\\ (not (any ?\" ?\\)))
(not (any ?\" ?\\))))
(char ?\"))
(zero-or-more blank)
?\:))
(defconst json-mode-number-re (rx (group (one-or-more digit)
(optional ?\. (one-or-more digit)))))
(defconst json-mode-keyword-re (rx (group (or "true" "false" "null"))))
(defconst json-font-lock-keywords-1
(list
(list json-mode-quoted-key-re 1 font-lock-keyword-face)
(list json-mode-quoted-string-re 1 font-lock-string-face)
(list json-mode-keyword-re 1 font-lock-constant-face)
(list json-mode-number-re 1 font-lock-constant-face)
)
"Level one font lock.")
;;;###autoload
(define-derived-mode json-mode javascript-mode "JSON"
"Major mode for editing JSON files"
(set (make-local-variable 'font-lock-defaults) '(json-font-lock-keywords-1 t)))
;; Well formatted JSON files almost always begin with “{” or “[”.
;;;###autoload
(add-to-list 'magic-fallback-mode-alist '("^[{[]$" . json-mode))
;;;###autoload
(defun json-mode-show-path ()
"Print the path to the node at point to the minibuffer, and yank to the kill ring."
(interactive)
(message (jsons-print-path)))
(define-key json-mode-map (kbd "C-c C-p") 'json-mode-show-path)
;;;###autoload
(defun json-mode-kill-path ()
(interactive)
(kill-new (jsons-print-path)))
(define-key json-mode-map (kbd "C-c P") 'json-mode-kill-path)
;;;###autoload
(defun json-mode-beautify ()
"Beautify / pretty-print the active region (or the entire buffer if no active region)."
(interactive)
(let ((json-reformat:indent-width js-indent-level)
(json-reformat:pretty-string? t))
(if (use-region-p)
(json-reformat-region (region-beginning) (region-end))
(json-reformat-region (buffer-end -1) (buffer-end 1)))))
(define-key json-mode-map (kbd "C-c C-f") 'json-mode-beautify)
(defun json-toggle-boolean ()
"If point is on `true' or `false', toggle it."
(interactive)
(unless (nth 8 (syntax-ppss)) ; inside a keyword, string or comment
(let* ((bounds (bounds-of-thing-at-point 'symbol))
(string (and bounds (buffer-substring-no-properties (car bounds) (cdr bounds))))
(pt (point)))
(when (and bounds (member string '("true" "false")))
(delete-region (car bounds) (cdr bounds))
(cond
((string= "true" string)
(insert "false")
(goto-char (if (= pt (cdr bounds)) (1+ pt) pt)))
(t
(insert "true")
(goto-char (if (= pt (cdr bounds)) (1- pt) pt))))))))
(define-key json-mode-map (kbd "C-c C-t") 'json-toggle-boolean)
(defun json-nullify-sexp ()
"Replace the sexp at point with `null'."
(interactive)
(let ((syntax (syntax-ppss)) symbol)
(cond
((nth 4 syntax) nil) ; inside a comment
((nth 3 syntax) ; inside a string
(goto-char (nth 8 syntax))
(when (save-excursion (forward-sexp) (skip-chars-forward "[:space:]") (eq (char-after) ?:))
;; sexp is an object key, so we nullify the entire object
(goto-char (nth 1 syntax)))
(kill-sexp)
(insert "null"))
((setq symbol (bounds-of-thing-at-point 'symbol))
(cond
((looking-at-p "null"))
((save-excursion (skip-chars-backward "[0-9.]") (looking-at json-mode-number-re))
(kill-region (match-beginning 0) (match-end 0))
(insert "null"))
(t (kill-region (car symbol) (cdr symbol)) (insert "null"))))
((< 0 (nth 0 syntax))
(goto-char (nth 1 syntax))
(kill-sexp)
(insert "null"))
(t nil))))
(define-key json-mode-map (kbd "C-c C-k") 'json-nullify-sexp)
(defun json-increment-number-at-point (&optional delta)
"Add DELTA to the number at point; DELTA defaults to 1."
(interactive)
(when (save-excursion (skip-chars-backward "[0-9.]") (looking-at json-mode-number-re))
(let ((num (+ (or delta 1)
(string-to-number (buffer-substring-no-properties (match-beginning 0) (match-end 0)))))
(pt (point)))
(delete-region (match-beginning 0) (match-end 0))
(insert (number-to-string num))
(goto-char pt))))
(define-key json-mode-map (kbd "C-c C-i") 'json-increment-number-at-point)
(defun json-decrement-number-at-point ()
"Decrement the number at point."
(interactive)
(json-increment-number-at-point -1))
(define-key json-mode-map (kbd "C-c C-d") 'json-decrement-number-at-point)
(provide 'json-mode)
;;; json-mode.el ends here