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;;; json-ts-mode.el --- tree-sitter support for JSON -*- lexical-binding: t; -*-
;; Copyright (C) 2022-2025 Free Software Foundation, Inc.
;; Author : Theodor Thornhill <theo@thornhill.no>
;; Maintainer : Theodor Thornhill <theo@thornhill.no>
;; Created : November 2022
;; Keywords : json languages tree-sitter
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'treesit)
(require 'rx)
(declare-function treesit-parser-create "treesit.c")
(declare-function treesit-induce-sparse-tree "treesit.c")
(declare-function treesit-node-start "treesit.c")
(declare-function treesit-node-type "treesit.c")
(declare-function treesit-node-child-by-field-name "treesit.c")
(defcustom json-ts-mode-indent-offset 2
"Number of spaces for each indentation step in `json-ts-mode'."
:version "29.1"
:type 'integer
:safe 'integerp
:group 'json)
(defvar json-ts-mode--syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?_ "_" table)
(modify-syntax-entry ?\\ "\\" table)
(modify-syntax-entry ?+ "." table)
(modify-syntax-entry ?- "." table)
(modify-syntax-entry ?= "." table)
(modify-syntax-entry ?% "." table)
(modify-syntax-entry ?< "." table)
(modify-syntax-entry ?> "." table)
(modify-syntax-entry ?& "." table)
(modify-syntax-entry ?| "." table)
(modify-syntax-entry ?\' "\"" table)
(modify-syntax-entry ?\240 "." table)
(modify-syntax-entry ?/ ". 124b" table)
(modify-syntax-entry ?* ". 23" table)
(modify-syntax-entry ?\n "> b" table)
(modify-syntax-entry ?\^m "> b" table)
table)
"Syntax table for `json-ts-mode'.")
(defvar json-ts--indent-rules
`((json
((node-is "}") parent-bol 0)
((node-is ")") parent-bol 0)
((node-is "]") parent-bol 0)
((parent-is "object") parent-bol json-ts-mode-indent-offset)
((parent-is "array") parent-bol json-ts-mode-indent-offset))))
(defvar json-ts-mode--font-lock-settings
(treesit-font-lock-rules
:language 'json
:feature 'comment
'((comment) @font-lock-comment-face)
:language 'json
:feature 'bracket
'((["[" "]" "{" "}"]) @font-lock-bracket-face)
:language 'json
:feature 'constant
'([(null) (true) (false)] @font-lock-constant-face)
:language 'json
:feature 'delimiter
'((["," ":"]) @font-lock-delimiter-face)
:language 'json
:feature 'number
'((number) @font-lock-number-face)
:language 'json
:feature 'string
'((string) @font-lock-string-face)
:language 'json
:feature 'escape-sequence
:override t
'((escape_sequence) @font-lock-escape-face)
:language 'json
:feature 'pair
:override t ; Needed for overriding string face on keys.
'((pair key: (_) @font-lock-property-use-face))
:language 'json
:feature 'error
:override t
'((ERROR) @font-lock-warning-face))
"Font-lock settings for JSON.")
(defun json-ts-mode--defun-name (node)
"Return the defun name of NODE.
Return nil if there is no name or if NODE is not a defun node."
(pcase (treesit-node-type node)
((or "pair" "object")
(string-trim (treesit-node-text
(treesit-node-child-by-field-name
node "key")
t)
"\"" "\""))))
;;;###autoload
(define-derived-mode json-ts-mode prog-mode "JSON"
"Major mode for editing JSON, powered by tree-sitter."
:group 'json
:syntax-table json-ts-mode--syntax-table
(unless (treesit-ready-p 'json)
(error "Tree-sitter for JSON isn't available"))
(treesit-parser-create 'json)
;; Comments.
(setq-local comment-start "// ")
(setq-local comment-start-skip "\\(?://+\\|/\\*+\\)\\s *")
(setq-local comment-end "")
;; Electric
(setq-local electric-indent-chars
(append "{}():;," electric-indent-chars))
;; Indent.
(setq-local treesit-simple-indent-rules json-ts--indent-rules)
;; Navigation.
(setq-local treesit-defun-type-regexp
(rx (or "pair" "object")))
(setq-local treesit-defun-name-function #'json-ts-mode--defun-name)
(setq-local treesit-thing-settings
`((json
(sentence "pair"))))
;; Font-lock.
(setq-local treesit-font-lock-settings json-ts-mode--font-lock-settings)
(setq-local treesit-font-lock-feature-list
'((comment constant number pair string)
(escape-sequence)
(bracket delimiter error)))
;; Imenu.
(setq-local treesit-simple-imenu-settings
'((nil "\\`pair\\'" nil nil)))
(treesit-major-mode-setup))
(derived-mode-add-parents 'json-ts-mode '(json-mode))
(if (treesit-ready-p 'json)
(add-to-list 'auto-mode-alist
'("\\.json\\'" . json-ts-mode)))
(provide 'json-ts-mode)
;;; json-ts-mode.el ends here
|
