all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob aef224ab3fa400b2e5759d48c7727aba58d571cc 17359 bytes (raw)
name: lisp/progmodes/go-ts-mode.el 	 # note: path name is non-authoritative(*)

  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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
 
;;; go-ts-mode.el --- tree-sitter support for Go  -*- lexical-binding: t; -*-

;; Copyright (C) 2022-2024 Free Software Foundation, Inc.

;; Author     : Randy Taylor <dev@rjt.dev>
;; Maintainer : Randy Taylor <dev@rjt.dev>
;; Created    : December 2022
;; Keywords   : go 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)
(eval-when-compile (require 'rx))

(declare-function treesit-parser-create "treesit.c")
(declare-function treesit-induce-sparse-tree "treesit.c")
(declare-function treesit-node-child "treesit.c")
(declare-function treesit-node-child-by-field-name "treesit.c")
(declare-function treesit-node-start "treesit.c")
(declare-function treesit-node-end "treesit.c")
(declare-function treesit-node-type "treesit.c")
(declare-function treesit-search-subtree "treesit.c")

(defcustom go-ts-mode-indent-offset 8
  "Number of spaces for each indentation step in `go-ts-mode'."
  :version "29.1"
  :type 'integer
  :safe 'integerp
  :group 'go)

(defvar go-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 ?\'  "\""     table)
    (modify-syntax-entry ?/   ". 124b" table)
    (modify-syntax-entry ?*   ". 23"   table)
    (modify-syntax-entry ?\n  "> b"    table)
    table)
  "Syntax table for `go-ts-mode'.")

(defvar go-ts-mode--indent-rules
  `((go
     ((parent-is "source_file") column-0 0)
     ((node-is ")") parent-bol 0)
     ((node-is "]") parent-bol 0)
     ((node-is "}") parent-bol 0)
     ((node-is "labeled_statement") no-indent 0)
     ((parent-is "raw_string_literal") no-indent 0)
     ((parent-is "argument_list") parent-bol go-ts-mode-indent-offset)
     ((parent-is "block") parent-bol go-ts-mode-indent-offset)
     ((parent-is "communication_case") parent-bol go-ts-mode-indent-offset)
     ((parent-is "const_declaration") parent-bol go-ts-mode-indent-offset)
     ((parent-is "default_case") parent-bol go-ts-mode-indent-offset)
     ((parent-is "expression_case") parent-bol go-ts-mode-indent-offset)
     ((parent-is "selector_expression") parent-bol go-ts-mode-indent-offset)
     ((parent-is "expression_switch_statement") parent-bol 0)
     ((parent-is "field_declaration_list") parent-bol go-ts-mode-indent-offset)
     ((parent-is "import_spec_list") parent-bol go-ts-mode-indent-offset)
     ((parent-is "interface_type") parent-bol go-ts-mode-indent-offset)
     ((parent-is "labeled_statement") parent-bol go-ts-mode-indent-offset)
     ((parent-is "literal_value") parent-bol go-ts-mode-indent-offset)
     ((parent-is "parameter_list") parent-bol go-ts-mode-indent-offset)
     ((parent-is "select_statement") parent-bol 0)
     ((parent-is "type_case") parent-bol go-ts-mode-indent-offset)
     ((parent-is "type_spec") parent-bol go-ts-mode-indent-offset)
     ((parent-is "type_switch_statement") parent-bol 0)
     ((parent-is "var_declaration") parent-bol go-ts-mode-indent-offset)
     (no-node parent-bol 0)))
  "Tree-sitter indent rules for `go-ts-mode'.")

(defvar go-ts-mode--keywords
  '("break" "case" "chan" "const" "continue" "default" "defer" "else"
    "fallthrough" "for" "func" "go" "goto" "if" "import" "interface" "map"
    "package" "range" "return" "select" "struct" "switch" "type" "var")
  "Go keywords for tree-sitter font-locking.")

(defvar go-ts-mode--operators
  '("+" "&" "+=" "&=" "&&" "==" "!=" "-" "|" "-=" "|=" "||" "<" "<="
    "*" "^" "*=" "^=" "<-" ">" ">=" "/" "<<" "/=" "<<=" "++" "=" ":=" "%"
    ">>" "%=" ">>=" "--" "!"  "..."  "&^" "&^=" "~")
  "Go operators for tree-sitter font-locking.")

(defvar go-ts-mode--builtin-functions
  '("append" "cap" "clear" "close" "complex" "copy" "delete" "imag" "len" "make"
    "max" "min" "new" "panic" "print" "println" "real" "recover")
  "Go built-in functions for tree-sitter font-locking.")

(defun go-ts-mode--iota-query-supported-p ()
  "Return t if the iota query is supported by the tree-sitter-go grammar."
  (ignore-errors
    (or (treesit-query-string "" '((iota) @font-lock-constant-face) 'go) t)))

;; tree-sitter-go changed method_spec to method_elem in
;; https://github.com/tree-sitter/tree-sitter-go/commit/b82ab803d887002a0af11f6ce63d72884580bf33
(defun go-ts-mode--method-elem-supported-p ()
  "Return t if Go grammar uses `method_elem' instead of `method_spec'."
  (ignore-errors
    (or (treesit-query-string "" '((method_elem) @cap) 'go) t)))

(defvar go-ts-mode--font-lock-settings
  (treesit-font-lock-rules
   :language 'go
   :feature 'bracket
   '((["(" ")" "[" "]" "{" "}"]) @font-lock-bracket-face)

   :language 'go
   :feature 'comment
   '((comment) @font-lock-comment-face)

   :language 'go
   :feature 'builtin
   `((call_expression
      function: ((identifier) @font-lock-builtin-face
                 (:match ,(rx-to-string
                           `(seq bol
                                 (or ,@go-ts-mode--builtin-functions)
                                 eol))
                         @font-lock-builtin-face))))

   :language 'go
   :feature 'constant
   `([(false) (nil) (true)] @font-lock-constant-face
     ,@(when (go-ts-mode--iota-query-supported-p)
         '((iota) @font-lock-constant-face))
     (const_declaration
      (const_spec name: (identifier) @font-lock-constant-face)))

   :language 'go
   :feature 'delimiter
   '((["," "." ";" ":"]) @font-lock-delimiter-face)

   :language 'go
   :feature 'operator
   `([,@go-ts-mode--operators] @font-lock-operator-face)

   :language 'go
   :feature 'definition
   `((function_declaration
      name: (identifier) @font-lock-function-name-face)
     (method_declaration
      name: (field_identifier) @font-lock-function-name-face)
     (,(if (go-ts-mode--method-elem-supported-p)
           'method_elem
         'method_spec)
      name: (field_identifier) @font-lock-function-name-face)
     (field_declaration
      name: (field_identifier) @font-lock-property-name-face)
     (parameter_declaration
      name: (identifier) @font-lock-variable-name-face)
     (short_var_declaration
      left: (expression_list
             (identifier) @font-lock-variable-name-face
             ("," (identifier) @font-lock-variable-name-face)*))
     (var_spec name: (identifier) @font-lock-variable-name-face
               ("," name: (identifier) @font-lock-variable-name-face)*))

   :language 'go
   :feature 'function
   '((call_expression
      function: (identifier) @font-lock-function-call-face)
     (call_expression
      function: (selector_expression
                 field: (field_identifier) @font-lock-function-call-face)))

   :language 'go
   :feature 'keyword
   `([,@go-ts-mode--keywords] @font-lock-keyword-face)

   :language 'go
   :feature 'label
   '((label_name) @font-lock-constant-face)

   :language 'go
   :feature 'number
   '([(float_literal)
      (imaginary_literal)
      (int_literal)] @font-lock-number-face)

   :language 'go
   :feature 'string
   '([(interpreted_string_literal)
      (raw_string_literal)
      (rune_literal)] @font-lock-string-face)

   :language 'go
   :feature 'type
   '([(package_identifier) (type_identifier)] @font-lock-type-face)

   :language 'go
   :feature 'property
   '((selector_expression field: (field_identifier) @font-lock-property-use-face)
     (keyed_element (_ (identifier) @font-lock-property-use-face)))

   :language 'go
   :feature 'variable
   '((identifier) @font-lock-variable-use-face)

   :language 'go
   :feature 'escape-sequence
   :override t
   '((escape_sequence) @font-lock-escape-face)

   :language 'go
   :feature 'error
   :override t
   '((ERROR) @font-lock-warning-face))
  "Tree-sitter font-lock settings for `go-ts-mode'.")

(defvar-keymap go-ts-mode-map
  :doc "Keymap used in Go mode, powered by tree-sitter"
  :parent prog-mode-map
  "C-c C-d" #'go-ts-mode-docstring)

;;;###autoload
(define-derived-mode go-ts-mode prog-mode "Go"
  "Major mode for editing Go, powered by tree-sitter.

\\{go-ts-mode-map}"
  :group 'go
  :syntax-table go-ts-mode--syntax-table

  (when (treesit-ready-p 'go)
    (treesit-parser-create 'go)

    ;; Comments.
    (setq-local comment-start "// ")
    (setq-local comment-end "")
    (setq-local comment-start-skip (rx "//" (* (syntax whitespace))))

    ;; Navigation.
    (setq-local treesit-defun-type-regexp
                (regexp-opt '("method_declaration"
                              "function_declaration"
                              "type_declaration")))
    (setq-local treesit-defun-name-function #'go-ts-mode--defun-name)

    ;; Imenu.
    (setq-local treesit-simple-imenu-settings
                `(("Function" "\\`function_declaration\\'" nil nil)
                  ("Method" "\\`method_declaration\\'" nil nil)
                  ("Struct" "\\`type_declaration\\'" go-ts-mode--struct-node-p nil)
                  ("Interface" "\\`type_declaration\\'" go-ts-mode--interface-node-p nil)
                  ("Type" "\\`type_declaration\\'" go-ts-mode--other-type-node-p nil)
                  ("Alias" "\\`type_declaration\\'" go-ts-mode--alias-node-p nil)))

    ;; Indent.
    (setq-local indent-tabs-mode t
                treesit-simple-indent-rules go-ts-mode--indent-rules)

    ;; Electric
    (setq-local electric-indent-chars
                (append "{}()" electric-indent-chars))

    ;; Font-lock.
    (setq-local treesit-font-lock-settings go-ts-mode--font-lock-settings)
    (setq-local treesit-font-lock-feature-list
                '(( comment definition)
                  ( keyword string type)
                  ( builtin constant escape-sequence label number)
                  ( bracket delimiter error function operator property variable)))

    (treesit-major-mode-setup)))

(derived-mode-add-parents 'go-ts-mode '(go-mode))

(if (treesit-ready-p 'go)
    ;; FIXME: Should we instead put `go-mode' in `auto-mode-alist'
    ;; and then use `major-mode-remap-defaults' to map it to `go-ts-mode'?
    (add-to-list 'auto-mode-alist '("\\.go\\'" . go-ts-mode)))

(defun go-ts-mode--defun-name (node &optional skip-prefix)
  "Return the defun name of NODE.
Return nil if there is no name or if NODE is not a defun node.
Methods are prefixed with the receiver name, unless SKIP-PREFIX is t."
  (pcase (treesit-node-type node)
    ("function_declaration"
     (treesit-node-text
      (treesit-node-child-by-field-name
       node "name")
      t))
    ("method_declaration"
     (let* ((receiver-node (treesit-node-child-by-field-name node "receiver"))
            (receiver (treesit-node-text (treesit-search-subtree receiver-node "type_identifier")))
            (method (treesit-node-text (treesit-node-child-by-field-name node "name"))))
       (if skip-prefix method
         (concat "(" receiver ")." method))))
    ("type_declaration"
     (treesit-node-text
      (treesit-node-child-by-field-name
       (treesit-node-child node 0 t) "name")
      t))))

(defun go-ts-mode--interface-node-p (node)
  "Return t if NODE is an interface."
  (and
   (string-equal "type_declaration" (treesit-node-type node))
   (treesit-search-subtree node "interface_type" nil nil 2)))

(defun go-ts-mode--struct-node-p (node)
  "Return t if NODE is a struct."
  (and
   (string-equal "type_declaration" (treesit-node-type node))
   (treesit-search-subtree node "struct_type" nil nil 2)))

(defun go-ts-mode--alias-node-p (node)
  "Return t if NODE is a type alias."
  (and
   (string-equal "type_declaration" (treesit-node-type node))
   (treesit-search-subtree node "type_alias" nil nil 1)))

(defun go-ts-mode--other-type-node-p (node)
  "Return t if NODE is a type other than interface, struct, or alias."
  (and
   (string-equal "type_declaration" (treesit-node-type node))
   (not (go-ts-mode--interface-node-p node))
   (not (go-ts-mode--struct-node-p node))
   (not (go-ts-mode--alias-node-p node))))

(defun go-ts-mode-docstring ()
  "Add a docstring comment for the current defun.
The added docstring is prefilled with the defun's name.  If the
comment already exists, jump to it."
  (interactive)
  (when-let ((defun-node (treesit-defun-at-point)))
    (goto-char (treesit-node-start defun-node))
    (if (go-ts-mode--comment-on-previous-line-p)
        ;; go to top comment line
        (while (go-ts-mode--comment-on-previous-line-p)
          (forward-line -1))
      (insert "// " (go-ts-mode--defun-name defun-node t))
      (newline)
      (backward-char))))

(defun go-ts-mode--comment-on-previous-line-p ()
  "Return t if the previous line is a comment."
  (when-let ((point (- (pos-bol) 1))
             ((> point 0))
             (node (treesit-node-at point)))
    (and
     ;; check point is actually inside the found node
     ;; treesit-node-at can return nodes after point
     (<= (treesit-node-start node) point (treesit-node-end node))
     (string-equal "comment" (treesit-node-type node)))))

;; go.mod support.

(defvar go-mod-ts-mode--syntax-table
  (let ((table (make-syntax-table)))
    (modify-syntax-entry ?/   ". 124b" table)
    (modify-syntax-entry ?\n  "> b"    table)
    table)
  "Syntax table for `go-mod-ts-mode'.")

(defvar go-mod-ts-mode--indent-rules
  `((gomod
     ((node-is ")") parent-bol 0)
     ((parent-is "exclude_directive") parent-bol go-ts-mode-indent-offset)
     ((parent-is "module_directive") parent-bol go-ts-mode-indent-offset)
     ((parent-is "replace_directive") parent-bol go-ts-mode-indent-offset)
     ((parent-is "require_directive") parent-bol go-ts-mode-indent-offset)
     ((parent-is "retract_directive") parent-bol go-ts-mode-indent-offset)
     ((go-mod-ts-mode--in-directive-p) no-indent go-ts-mode-indent-offset)
     (no-node no-indent 0)))
  "Tree-sitter indent rules for `go-mod-ts-mode'.")

(defun go-mod-ts-mode--in-directive-p ()
  "Return non-nil if point is inside a directive.
When entering an empty directive or adding a new entry to one, no node
will be present meaning none of the indentation rules will match,
because there is no parent to match against.  This function determines
what the parent of the node would be if it were a node."
  (lambda (node _ _ &rest _)
    (unless (treesit-node-type node)
      (save-excursion
        (backward-up-list)
        (back-to-indentation)
        (pcase (treesit-node-type (treesit-node-at (point)))
          ("exclude" t)
          ("module" t)
          ("replace" t)
          ("require" t)
          ("retract" t))))))

(defvar go-mod-ts-mode--keywords
  '("exclude" "go" "module" "replace" "require" "retract")
  "go.mod keywords for tree-sitter font-locking.")

(defvar go-mod-ts-mode--font-lock-settings
  (treesit-font-lock-rules
   :language 'gomod
   :feature 'bracket
   '((["(" ")"]) @font-lock-bracket-face)

   :language 'gomod
   :feature 'comment
   '((comment) @font-lock-comment-face)

   :language 'gomod
   :feature 'keyword
   `([,@go-mod-ts-mode--keywords] @font-lock-keyword-face)

   :language 'gomod
   :feature 'number
   '([(go_version) (version)] @font-lock-number-face)

   :language 'gomod
   :feature 'operator
   '((["=>"]) @font-lock-operator-face)

   :language 'gomod
   :feature 'error
   :override t
   '((ERROR) @font-lock-warning-face))
  "Tree-sitter font-lock settings for `go-mod-ts-mode'.")

;;;###autoload
(define-derived-mode go-mod-ts-mode prog-mode "Go Mod"
  "Major mode for editing go.mod files, powered by tree-sitter."
  :group 'go
  :syntax-table go-mod-ts-mode--syntax-table

  (when (treesit-ready-p 'gomod)
    (treesit-parser-create 'gomod)

    ;; Comments.
    (setq-local comment-start "// ")
    (setq-local comment-end "")
    (setq-local comment-start-skip (rx "//" (* (syntax whitespace))))

    ;; Indent.
    (setq-local indent-tabs-mode t
                treesit-simple-indent-rules go-mod-ts-mode--indent-rules)

    ;; Font-lock.
    (setq-local treesit-font-lock-settings go-mod-ts-mode--font-lock-settings)
    (setq-local treesit-font-lock-feature-list
                '((comment)
                  (keyword)
                  (number)
                  (bracket error operator)))

    (treesit-major-mode-setup)))

(derived-mode-add-parents 'go-mod-ts-mode '(go-mod-mode))

(if (treesit-ready-p 'gomod)
    (add-to-list 'auto-mode-alist '("/go\\.mod\\'" . go-mod-ts-mode)))

(provide 'go-ts-mode)

;;; go-ts-mode.el ends here

debug log:

solving aef224ab3fa ...
found aef224ab3fa in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.