1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
| | ;;; json-ts-mode.el --- tree-sitter support for JSON -*- lexical-binding: t; -*-
;; Copyright (C) 2022 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-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)))
;; Taken from the cc-langs version
(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 ?` "\"" table)
(modify-syntax-entry ?\240 "." 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))))
(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-variable-name-face))
:language 'json
:feature 'error
:override t
'((ERROR) @font-lock-warning-face))
"Font-lock settings for JSON.")
(defun json-ts-mode--imenu-1 (node)
"Helper for `json-ts-mode--imenu'.
Find string representation for NODE and set marker, then recurse
the subtrees."
(let* ((ts-node (car node))
(subtrees (mapcan #'json-ts-mode--imenu-1 (cdr node)))
(name (when ts-node
(treesit-node-text
(treesit-node-child-by-field-name
ts-node "key")
t)))
(marker (when ts-node
(set-marker (make-marker)
(treesit-node-start ts-node)))))
(cond
((null ts-node) subtrees)
(subtrees
`((,name ,(cons name marker) ,@subtrees)))
(t
`((,name . ,marker))))))
(defun json-ts-mode--imenu ()
"Return Imenu alist for the current buffer."
(let* ((node (treesit-buffer-root-node))
(tree (treesit-induce-sparse-tree
node "pair" nil 1000)))
(json-ts-mode--imenu-1 tree)))
;;;###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")))
;; 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 imenu-create-index-function #'json-ts-mode--imenu)
(setq-local which-func-functions nil) ;; Piggyback on imenu
(treesit-major-mode-setup))
(provide 'json-ts-mode)
;;; json-ts-mode.el ends here
|