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;;; yaml-ts-mode.el --- tree-sitter support for YAML -*- 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 : yaml 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)
(declare-function treesit-parser-create "treesit.c")
(declare-function treesit-node-start "treesit.c")
(declare-function treesit-node-end "treesit.c")
(declare-function treesit-node-type "treesit.c")
(defvar yaml-ts-mode--syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?# "<" table)
(modify-syntax-entry ?\n ">" table)
(modify-syntax-entry ?& "." table)
(modify-syntax-entry ?* "." table)
(modify-syntax-entry ?\( "." table)
(modify-syntax-entry ?\) "." table)
(modify-syntax-entry ?\' "\"" table)
table)
"Syntax table for `yaml-ts-mode'.")
(defvar yaml-ts-mode--font-lock-settings
(treesit-font-lock-rules
:language 'yaml
:feature 'bracket
'((["[" "]" "{" "}"]) @font-lock-bracket-face)
:language 'yaml
:feature 'comment
'((comment) @font-lock-comment-face)
:language 'yaml
:feature 'constant
'([(boolean_scalar)
(null_scalar)
(reserved_directive)
(tag_directive)
(yaml_directive)] @font-lock-constant-face)
:language 'yaml
:feature 'delimiter
'((["," ":" "-" ">" "?" "|"]) @font-lock-delimiter-face)
:language 'yaml
:feature 'misc-punctuation
'((["---" "..." "&" "*"]) @font-lock-misc-punctuation-face)
:language 'yaml
:feature 'number
'([(float_scalar) (integer_scalar)] @font-lock-number-face)
:language 'yaml
:feature 'type
'([(alias_name) (anchor_name) (tag)] @font-lock-type-face)
:language 'yaml
:feature 'string
:override t
'([(block_scalar)
(double_quote_scalar)
(single_quote_scalar)
(string_scalar)] @font-lock-string-face)
:language 'yaml
:feature 'escape-sequence
:override t
'((escape_sequence) @font-lock-escape-face)
:language 'yaml
:feature 'property
:override t
'((block_mapping_pair
key: (flow_node (plain_scalar (string_scalar) @font-lock-property-use-face)))
(block_mapping_pair
key: (flow_node
[(double_quote_scalar) (single_quote_scalar)] @font-lock-property-use-face))
(flow_mapping
(_ key: (flow_node (plain_scalar (string_scalar) @font-lock-property-use-face))))
(flow_mapping
(_ key:
(flow_node
[(double_quote_scalar) (single_quote_scalar)] @font-lock-property-use-face)))
(flow_sequence
(_ key: (flow_node (plain_scalar (string_scalar) @font-lock-property-use-face))))
(flow_sequence
(_ key:
(flow_node
[(double_quote_scalar) (single_quote_scalar)] @font-lock-property-use-face))))
:language 'yaml
:feature 'error
:override t
'((ERROR) @font-lock-warning-face))
"Tree-sitter font-lock settings for `yaml-ts-mode'.")
(defun yaml-ts-mode--fill-paragraph (&optional justify)
"Fill paragraph.
Behaves like `fill-paragraph', but respects block node
boundaries. JUSTIFY is passed to `fill-paragraph'."
(interactive "*P")
(save-restriction
(widen)
(let ((node (treesit-node-at (point))))
(if (member (treesit-node-type node) '("block_scalar" "comment"))
(let* ((start (treesit-node-start node))
(end (treesit-node-end node))
(start-marker (point-marker))
(fill-paragraph-function nil))
(save-excursion
(goto-char start)
(forward-line)
(move-marker start-marker (point))
(narrow-to-region (point) end))
(fill-region start-marker end justify))
t))))
;;;###autoload
(define-derived-mode yaml-ts-mode text-mode "YAML"
"Major mode for editing YAML, powered by tree-sitter."
:group 'yaml
:syntax-table yaml-ts-mode--syntax-table
(when (treesit-ready-p 'yaml)
(treesit-parser-create 'yaml)
;; Comments.
(setq-local comment-start "# ")
(setq-local comment-end "")
;; Indentation.
(setq-local indent-tabs-mode nil)
;; Font-lock.
(setq-local treesit-font-lock-settings yaml-ts-mode--font-lock-settings)
(setq-local treesit-font-lock-feature-list
'((comment)
(string type)
(constant escape-sequence number property)
(bracket delimiter error misc-punctuation)))
(setq-local fill-paragraph-function #'yaml-ts-mode--fill-paragraph)
(treesit-major-mode-setup)))
(derived-mode-add-parents 'yaml-ts-mode '(yaml-mode))
(if (treesit-ready-p 'yaml)
(add-to-list 'auto-mode-alist '("\\.ya?ml\\'" . yaml-ts-mode)))
(provide 'yaml-ts-mode)
;;; yaml-ts-mode.el ends here
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