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| | ;;; css-ts-mode.el --- tree-sitter support for CSS -*- 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 : css languages tree-sitter
;; This file is part of GNU Emacs.
;; 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:
;;
;;; Code:
(require 'treesit)
(require 'rx)
(require 'css-mode)
(defcustom css-ts-mode-indent-offset 2
"Number of spaces for each indentation step in `ts-mode'."
:type 'integer
:safe 'integerp
:group 'css)
(defvar css-ts-mode--indent-rules
`((css
((node-is "}") parent-bol 0)
((node-is ")") parent-bol 0)
((node-is "]") parent-bol 0)
((parent-is "block") parent-bol css-ts-mode-indent-offset)
((parent-is "arguments") parent-bol css-ts-mode-indent-offset)
((parent-is "declaration") parent-bol css-ts-mode-indent-offset))))
(defvar css-ts-mode--settings
(treesit-font-lock-rules
:language 'css
:feature 'basic
:override t
`((unit) @font-lock-constant-face
(integer_value) @font-lock-builtin-face
(float_value) @font-lock-builtin-face
(plain_value) @font-lock-variable-name-face
(comment) @font-lock-comment-face
(class_selector) @css-selector
(child_selector) @css-selector
(id_selector) @css-selector
(tag_name) @css-selector
(property_name) @css-property
(class_name) @css-selector
(function_name) @font-lock-function-name-face)))
(defun css-ts-mode--imenu-1 (node)
"Helper for `css-ts-mode--imenu'.
Find string representation for NODE and set marker, then recurse
the subtrees."
(let* ((ts-node (car node))
(subtrees (mapcan #'css-ts-mode--imenu-1 (cdr node)))
(name (when ts-node
(if (equal (treesit-node-type ts-node) "tag_name")
(treesit-node-text ts-node)
(treesit-node-text (treesit-node-child ts-node 1) 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 css-ts-mode--imenu ()
"Return Imenu alist for the current buffer."
(let* ((node (treesit-buffer-root-node))
(tree (treesit-induce-sparse-tree
node (rx (or "class_selector"
"id_selector"
"tag_name")))))
(css-ts-mode--imenu-1 tree)))
(define-derived-mode css-ts-mode prog-mode "CSS"
"Major mode for editing CSS."
:group 'css
:syntax-table css-mode-syntax-table
(unless (treesit-ready-p nil 'css)
(error "Tree-sitter for CSS isn't available"))
(treesit-parser-create 'css)
;; Comments
(setq-local comment-start "/*")
(setq-local comment-start-skip "/\\*+[ \t]*")
(setq-local comment-end "*/")
(setq-local comment-end-skip "[ \t]*\\*+/")
;; Indent.
(setq-local treesit-simple-indent-rules css-ts-mode--indent-rules)
;; Navigation.
(setq-local treesit-defun-type-regexp "rule_set")
;; Font-lock.
(setq-local treesit-font-lock-settings css-ts-mode--settings)
(setq treesit-font-lock-feature-list '((basic) () ()))
;; Imenu.
(setq-local imenu-create-index-function #'css-ts-mode--imenu)
(setq-local which-func-functions nil) ;; Piggyback on imenu
(treesit-major-mode-setup))
(provide 'css-ts-mode)
;;; css-ts-mode.el ends here
|