├── .github └── workflows │ └── action.yml ├── .gitignore ├── Eask ├── LICENSE ├── README.org ├── scala-ts-mode-autoloads.el ├── scala-ts-mode-pkg.el └── scala-ts-mode.el /.github/workflows/action.yml: -------------------------------------------------------------------------------- 1 | name: CI 2 | 3 | on: 4 | push: 5 | branches: 6 | - main 7 | - "ci/**" 8 | 9 | pull_request: 10 | branches: [main] 11 | 12 | jobs: 13 | check: 14 | runs-on: ubuntu-latest 15 | strategy: 16 | fail-fast: false 17 | matrix: 18 | emacs_version: 19 | - release-snapshot 20 | ignore_warnings: 21 | - true 22 | steps: 23 | - uses: actions/checkout@v2 24 | - uses: purcell/setup-emacs@master 25 | with: 26 | version: ${{ matrix.emacs_version }} 27 | - uses: leotaku/elisp-check@master 28 | with: 29 | check: melpa 30 | file: "scala-ts-mode.el" 31 | ignore_warnings: false 32 | warnings_as_errors: false 33 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.scala 2 | .eask/ 3 | *.elc 4 | .metals/ 5 | .scala-build/ 6 | .bsp/ -------------------------------------------------------------------------------- /Eask: -------------------------------------------------------------------------------- 1 | (package "scala-ts-mode" 2 | "1.0.0" 3 | "An tree-sitter based major-mode for Scala") 4 | 5 | (website-url "https://github.com/KaranAhlawat/scala-ts-mode") 6 | (keywords "emacs" "tree-sitter" "scala" "scala-ts-mode" "languages") 7 | 8 | (package-file "scala-ts-mode.el") 9 | (files "scala-ts-mode.el" "scala-ts-mode-autoloads.el" "scala-ts-mode-pkg.el") 10 | 11 | (source "gnu") 12 | (source "melpa") 13 | 14 | (depends-on "emacs" "29.1") 15 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.org: -------------------------------------------------------------------------------- 1 | #+TITLE: scala-ts-mode 2 | 3 | #+PROPERTY: LOGGING nil 4 | 5 | * Introduction 6 | ~scala-ts-mode~ is a [[https://tree-sitter.github.io/tree-sitter/][tree-sitter]] based GNU Emacs major mode built on top of the Emacs 29+ ~treesit~ library. It provides the following features in a Scala buffer- 7 | 1. efficient font-locking using tree-sitter 8 | 2. ~imenu~ integration 9 | 3. indentation support using tree-sitter 10 | 11 | The major-mode is mostly complete and in a very usable state currently. Improvements will come as I find bugs, edge cases, more use cases or the upstream grammar evolves. 12 | 13 | * Requirements 14 | To use the package, the following dependencies are required. 15 | 1. GNU Emacs 29+, built with support for tree-sitter. 16 | 2. tree-sitter grammar for Scala (you can use the ~treesit-install-language-grammar~ function for installing it.) 17 | 18 | * Installation 19 | To install the package, you can use any Emacs package manager of your choice, to pull the package either from MELPA or source. For example, with straight.el, you can do the following - 20 | 21 | ** MELPA 22 | #+begin_src emacs-lisp 23 | (straight-use-package 'scala-ts-mode) 24 | #+end_src 25 | 26 | ** Source 27 | #+BEGIN_SRC emacs-lisp 28 | (straight-use-package '(scala-ts-mode :type git :host github :repo "KaranAhlawat/scala-ts-mode")) 29 | #+END_SRC 30 | 31 | Then, you can simply call ~scala-ts-mode~ in a Scala buffer. 32 | 33 | * Configuration 34 | You may wish to customize ~treesit-font-lock-level~, using ~M-x customize-variable~ or by adding a line such as this to your user init file: 35 | 36 | #+begin_src emacs-lisp 37 | (setq treesit-font-lock-level 4) 38 | #+end_src 39 | 40 | The default font lock level is 3. At that level, not as many constructs are highlighted as you might like. Increasing it to 4 results in richer highlighting. 41 | 42 | ** Eglot Setup 43 | Some versions of Emacs aren't set up with an Eglot that knows which LSP server to use for ~scala-ts-mode~. 44 | This code can be in ~init.el~ before loading Eglot to tell it to use the same function for ~scala-ts-mode~ that it does for ~scala-mode~. 45 | 46 | #+begin_src emacs-lisp 47 | (add-to-list 'eglot-server-programs 48 | `((scala-mode scala-ts-mode) 49 | . ,(alist-get 'scala-mode eglot-server-programs))) 50 | #+end_src 51 | 52 | * Contributions 53 | Contributions are welcome! These can be in the form of PRs, Issues, or any other way you can think of. This is my first package, so please don't hold back :) 54 | 55 | * License 56 | GPLv3 57 | -------------------------------------------------------------------------------- /scala-ts-mode-autoloads.el: -------------------------------------------------------------------------------- 1 | ;;; scala-ts-mode-autoloads.el --- automatically extracted autoloads (do not edit) -*- lexical-binding: t -*- 2 | ;; Generated by the `loaddefs-generate' function. 3 | 4 | ;; This file is part of GNU Emacs. 5 | 6 | ;;; Code: 7 | 8 | (add-to-list 'load-path (or (and load-file-name (directory-file-name (file-name-directory load-file-name))) (car load-path))) 9 | 10 | 11 | 12 | ;;; Generated autoloads from scala-ts-mode.el 13 | 14 | (autoload 'scala-ts-mode "scala-ts-mode" "\ 15 | Major mode for Scala files using tree-sitter. 16 | 17 | (fn)" t) 18 | (add-to-list 'auto-mode-alist '("\\.scala\\'" . scala-ts-mode)) 19 | (add-to-list 'auto-mode-alist '("\\.sc\\'" . scala-ts-mode)) 20 | (add-to-list 'auto-mode-alist '("\\.sbt\\'" . scala-ts-mode)) 21 | (register-definition-prefixes "scala-ts-mode" '("scala-ts-")) 22 | 23 | ;;; End of scraped data 24 | 25 | (provide 'scala-ts-mode-autoloads) 26 | 27 | ;; Local Variables: 28 | ;; version-control: never 29 | ;; no-byte-compile: t 30 | ;; no-update-autoloads: t 31 | ;; no-native-compile: t 32 | ;; coding: utf-8-emacs-unix 33 | ;; End: 34 | 35 | ;;; scala-ts-mode-autoloads.el ends here 36 | -------------------------------------------------------------------------------- /scala-ts-mode-pkg.el: -------------------------------------------------------------------------------- 1 | ;;; Generated package description from scala-ts-mode.el -*- no-byte-compile: t -*- 2 | (define-package "scala-ts-mode" "1.0.0" "An tree-sitter based major-mode for Scala" '((emacs "29.1")) :authors '(("Karan Ahlawat" . "ahlawatkaran12@gmail.com")) :maintainer '("Karan Ahlawat" . "ahlawatkaran12@gmail.com") :keywords '("emacs" "scala" "languages" "tree-sitter" "scala-ts-mode") :url "https://github.com/KaranAhlawat/scala-ts-mode") 3 | -------------------------------------------------------------------------------- /scala-ts-mode.el: -------------------------------------------------------------------------------- 1 | ;;; scala-ts-mode.el --- An tree-sitter based major-mode for Scala -*- lexical-binding: t; -*- 2 | 3 | ;; Copyright (C) 2024 Karan Ahlawat 4 | 5 | ;; Author: Karan Ahlawat 6 | ;; Version: 1.0.0 7 | ;; Filename: scala-ts-mode.el 8 | ;; Package-Requires: ((emacs "29.1")) 9 | ;; Keywords: emacs, scala, languages, tree-sitter, scala-ts-mode 10 | ;; URL: https://github.com/KaranAhlawat/scala-ts-mode 11 | 12 | ;; This program is free software; you can redistribute it and/or modify 13 | ;; it under the terms of the GNU General Public License as published by 14 | ;; the Free Software Foundation, either version 3 of the License, or 15 | ;; (at your option) any later version. 16 | 17 | ;; This program is distributed in the hope that it will be useful, 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 | ;; GNU General Public License for more details. 21 | 22 | ;; You should have received a copy of the GNU General Public License 23 | ;; along with this program. If not, see . 24 | 25 | ;;; Commentary: 26 | 27 | ;; This package provides a tree-sitter based major mode for the Scala 28 | ;; programming language. Currently, the supported features and their 29 | ;; statuses are 30 | ;; 1. font-locking (complete, looking for bugs and maintainance) 31 | ;; 2. imenu (basic support, needs work) 32 | ;; 3. indentation 33 | 34 | ;;; Code: 35 | 36 | (require 'rx) 37 | (require 'treesit) 38 | (require 'thingatpt) 39 | 40 | (declare-function treesit-parser-create "treesit.c") 41 | (declare-function treesit-node-type "treesit.c") 42 | (declare-function treesit-node-text "treesit.c") 43 | (declare-function treesit-node-child-by-field-name "treesit.c") 44 | (declare-function treesit-parent-while "treesit.c") 45 | (declare-function treesit-parent-until "treesit.c") 46 | (declare-function treesit-node-prev-sibling "treesit.c") 47 | (declare-function treesit-node-next-sibling "treesit.c") 48 | (declare-function treesit-node-type "treesit.c") 49 | (declare-function treesit-node-text "treesit.c") 50 | (declare-function treesit-node-start "treesit.c") 51 | (declare-function treesit-node-end "treesit.c") 52 | (declare-function treesit-node-child "treesit.c") 53 | 54 | (defcustom scala-ts-indent-offset 2 55 | "Number of spaces for each indentation in `scala-ts-mode'." 56 | :version "29.1" 57 | :type 'integer 58 | :safe 'integerp 59 | :group 'scala-ts) 60 | 61 | (defvar scala-ts--syntax-table 62 | (let ((table (make-syntax-table))) 63 | ;; "." denotes punctuation 64 | (modify-syntax-entry ?+ "." table) 65 | (modify-syntax-entry ?- "." table) 66 | (modify-syntax-entry ?/ "." table) 67 | ;; Just reinforcing some defaults 68 | (modify-syntax-entry ?\\ "\\" table) ; Escape seq start 69 | (modify-syntax-entry ?\" "\"" table) ; String start 70 | (modify-syntax-entry ?' "'" table) ; Quote expression start 71 | (modify-syntax-entry ?/ ". 124b" table) ; Line/block comment // or /* */ 72 | (modify-syntax-entry ?* ". 23n" table) ; Block comment /* */ 73 | (modify-syntax-entry ?\n "> b" table) ; Comment ends with newline 74 | (modify-syntax-entry ?\r "> b" table) ; Comment ends with carriage return 75 | table) 76 | "Syntax table for `scala-ts-mode'.") 77 | 78 | ;; utility functions -- begin 79 | 80 | (defun scala-ts--node-type= (type node) 81 | "Compare TYPE and type of NODE for string equality." 82 | (string= type (treesit-node-type node))) 83 | 84 | ;; utility functions -- end 85 | 86 | ;; Keywords 87 | (defvar scala-ts--keywords 88 | '("case" "class" "enum" "extends" "derives" "finally" 89 | "object" "override" "package" "trait" "type" "val" 90 | "var" "with" "given" "using" "end" "implicit" "new" 91 | "extension" "with" "def" "import" "export" "macro") 92 | "Keywords for `scala-ts-mode'.") 93 | 94 | (defvar scala-ts--keywords-type-qualifiers 95 | '("abstract" "final" "lazy" 96 | "sealed" "private" "protected") 97 | "Type qualifiers for `scala-ts-mode'.") 98 | 99 | (defvar scala-ts--keywords-control 100 | '("if" "then" "else" "match" "do" "for" "yield" 101 | "while" "try" "catch" "throw" "return") 102 | "Control flow for `scala-ts-mode'.") 103 | 104 | (defvar scala-ts--brackets 105 | '("(" ")" "[" "]" "{" "}") 106 | "Brackets for `scala-ts-mode'.") 107 | 108 | (defvar scala-ts--delimiters 109 | '("." "," ";") 110 | "Delimiters for `scala-ts-mode'.") 111 | 112 | (rx-define scala-ts--indent 113 | (| ":" "=" "{" "[" "(" "with" "=>")) 114 | 115 | (rx-define scala-ts--indent-keywords 116 | (| "for" "yield" "if" "then" "else" 117 | "try" "catch" "finally" "match")) 118 | 119 | ;; TODO: wip 120 | (defvar scala-ts--treesit-range-settings 121 | (treesit-range-rules) 122 | "Treesitter range settings for `scala-ts-mode'.") 123 | 124 | (defvar scala-ts--treesit-font-lock-settings 125 | (treesit-font-lock-rules 126 | :language 'scala 127 | :feature 'keyword 128 | `([,@scala-ts--keywords ] @font-lock-keyword-face 129 | [,@scala-ts--keywords-type-qualifiers] @font-lock-keyword-face 130 | (opaque_modifier) @font-lock-keyword-face 131 | (infix_modifier) @font-lock-keyword-face 132 | (transparent_modifier) @font-lock-keyword-face 133 | (open_modifier) @font-lock-keyword-face 134 | (inline_modifier) @font-lock-keyword-face 135 | (infix_modifier) @font-lock-keyword-face 136 | [,@scala-ts--keywords-control] @font-lock-keyword-face 137 | (null_literal) @font-lock-builtin-face 138 | (wildcard) @font-lock-builtin-face 139 | (annotation) @font-lock-preprocessor-face 140 | ;; `case' is handled specially here, to limit it into a context 141 | (indented_cases 142 | (case_clause ("case") @font-lock-keyword-face)) 143 | (case_block 144 | (case_clause ("case") @font-lock-keyword-face))) 145 | 146 | :language 'scala 147 | :feature 'extra 148 | `([,@scala-ts--brackets] @font-lock-bracket-face 149 | [,@scala-ts--delimiters] @font-lock-delimiter-face) 150 | 151 | :language 'scala 152 | :feature 'comment 153 | '((comment) @font-lock-comment-face 154 | (block_comment) @font-lock-comment-face) 155 | 156 | :language 'scala 157 | :feature 'doc-comment 158 | :override 'prepend 159 | `((((block_comment) @font-lock-doc-face) 160 | (:match ,(rx-to-string '( : bol "/**" 161 | (* (| (not "*") 162 | (: "*" (not "/")))) 163 | (+ "*") "/") 164 | t) 165 | @font-lock-doc-face))) 166 | 167 | :language 'scala 168 | :feature 'definition 169 | '((class_definition 170 | name: (identifier) @font-lock-type-face) 171 | (enum_definition 172 | name: (identifier) @font-lock-type-face) 173 | (object_definition 174 | name: (identifier) @font-lock-type-face) 175 | (trait_definition 176 | name: (identifier) @font-lock-type-face) 177 | (full_enum_case 178 | name: (identifier) @font-lock-type-face) 179 | (simple_enum_case 180 | name: (identifier) @font-lock-type-face)) 181 | 182 | :language 'scala 183 | :feature 'function 184 | '(;; method definitions 185 | (function_declaration 186 | name: (identifier) @font-lock-function-name-face) 187 | (function_definition 188 | name: (identifier) @font-lock-function-name-face) 189 | 190 | ;; method invocations 191 | (call_expression 192 | function: (identifier) @font-lock-function-call-face) 193 | (call_expression 194 | function: (operator_identifier) @font-lock-function-call-face) 195 | (call_expression 196 | function: (field_expression 197 | field: (identifier) @font-lock-function-call-face)) 198 | ((call_expression 199 | function: (identifier) @font-lock-function-call-face) 200 | (:match "^[A-Z]" @font-lock-function-call-face)) 201 | (generic_function 202 | function: (identifier) @font-lock-function-call-face) 203 | 204 | 205 | ;; function definitions 206 | (function_definition 207 | name: (identifier) @font-lock-function-name-face) 208 | (parameter 209 | name: (identifier) @font-lock-variable-name-face) 210 | (binding 211 | name: (identifier) @font-lock-variable-name-face)) 212 | 213 | :language 'scala 214 | :feature 'variable 215 | '((class_parameter 216 | name: (identifier) @font-lock-variable-name-face) 217 | (val_definition 218 | pattern: (identifier) @font-lock-variable-name-face) 219 | (var_definition 220 | pattern: (identifier) @font-lock-variable-name-face) 221 | (val_declaration 222 | name: (identifier) @font-lock-variable-name-face) 223 | (var_declaration 224 | name: (identifier) @font-lock-variable-name-face) 225 | ;; expressions 226 | (field_expression field: (identifier) @font-lock-property-use-face) 227 | ;; this and super 228 | (((identifier) @font-lock-variable-use-face) 229 | (:match "^this$" @font-lock-variable-use-face)) 230 | (((identifier) @font-lock-function-call-face) 231 | (:match "^super$" @font-lock-function-call-face)) 232 | (identifier) @font-lock-variable-use-face) 233 | 234 | :language 'scala 235 | :feature 'type 236 | '((type_identifier) @font-lock-type-face 237 | ("_end_ident" @font-lock-type-face 238 | (:match "^[A-Z]" @font-lock-type-face)) 239 | "_end_ident" @font-lock-keyword-face 240 | ;; expressions 241 | ((field_expression 242 | value: (identifier) @font-lock-type-face) 243 | (:match "^[A-Z]" @font-lock-type-face)) 244 | (((identifier) @font-lock-type-face) 245 | (:match "^[A-Z]" @font-lock-type-face))) 246 | 247 | :language 'scala 248 | :feature 'import 249 | '(((import_declaration 250 | path: (identifier) @font-lock-type-face) 251 | (:match "^[A-Z]" @font-lock-type-face)) 252 | (stable_identifier (identifier) @default) 253 | ((stable_identifier (identifier) @font-lock-type-face) 254 | (:match "^[A-Z]" @font-lock-type-face)) 255 | (export_declaration 256 | path: (identifier) @default) 257 | (stable_identifier (identifier) @default) 258 | ((export_declaration 259 | path: (identifier) @font-lock-type-face) 260 | (:match "^[A-Z]" @font-lock-type-face)) 261 | ((stable_identifier (identifier) @font-lock-type-face) 262 | (:match "^[A-Z]" @font-lock-type-face)) 263 | ((namespace_selectors (identifier) @font-lock-type-face) 264 | (:match "^[A-Z]" @font-lock-type-face))) 265 | 266 | :language 'scala 267 | :feature 'operator 268 | '((infix_expression operator: (identifier) @font-lock-operator-face) 269 | (infix_expression operator: (operator_identifier) @font-lock-operator-face) 270 | (infix_type operator: (operator_identifier) @font-lock-operator-face) 271 | (infix_type operator: (operator_identifier) @font-lock-operator-face) 272 | ["=>" "<-" "@" (operator_identifier)] @font-lock-operator-face) 273 | 274 | :language 'scala 275 | :feature 'literal 276 | '((boolean_literal) @font-lock-constant-face 277 | (integer_literal) @font-lock-number-face 278 | (floating_point_literal) @font-lock-number-face 279 | [ 280 | (string) 281 | (character_literal) 282 | ] @font-lock-string-face) 283 | 284 | :language 'scala 285 | :feature 'interpolation 286 | :override 'prepend 287 | '((interpolation [(block) (identifier)] @font-lock-variable-use-face) 288 | (interpolation (block ["{" "}"] @font-lock-bracket-face)) 289 | (interpolated_string_expression 290 | interpolator: (identifier) @font-lock-function-call-face) 291 | (interpolated_string) @font-lock-string-face 292 | "$" @font-lock-punctuation-face)) 293 | "Treesitter font-lock settings for `scala-ts-mode'.") 294 | 295 | ;; BEGIN: Helper functions for indentation 296 | (defun scala-ts--indent-end (node &rest _) 297 | "Return anchor position for end clause NODE." 298 | (let ((label (treesit-node-text (treesit-node-next-sibling node) t))) 299 | (cond 300 | ;; Check if end is already correctly indented 301 | ((let ((next-sibling (treesit-node-next-sibling node)) 302 | (prev-sibling (treesit-node-prev-sibling node))) 303 | (and (string= 304 | (treesit-node-type next-sibling) 305 | "_end_ident") 306 | (string-match-p 307 | "definition" 308 | (treesit-node-type prev-sibling)) 309 | (string= 310 | label 311 | (treesit-node-text 312 | (treesit-node-child prev-sibling 0 t))) 313 | (treesit-node-start prev-sibling)))) 314 | ;; indent end correctly 315 | ((string= (treesit-node-type (treesit-node-next-sibling node)) 316 | "_end_ident") 317 | (treesit-node-start (treesit-parent-until 318 | node 319 | (lambda (node) 320 | (and (string-match-p 321 | "definition" 322 | (treesit-node-type node)) 323 | (string= label 324 | (treesit-node-text 325 | (treesit-node-child node 0 t)))))))) 326 | ;; indent end correctly 327 | (t 328 | (save-excursion 329 | (goto-char (treesit-node-start node)) 330 | (re-search-backward label) 331 | (back-to-indentation) 332 | (point)))))) 333 | 334 | (defun scala-ts--indent-if-anchor (node parent &rest _) 335 | "Return anchor position for NODE when PARENT is if_expression." 336 | (cond 337 | ((and (string= (treesit-node-type node) 338 | "else") 339 | (string= (treesit-node-type (treesit-node-next-sibling node)) 340 | "if_expression")) 341 | (treesit-node-start parent)) 342 | 343 | (t 344 | (treesit-node-start (treesit-parent-while 345 | parent 346 | (lambda (cur-node) 347 | (string= (treesit-node-type cur-node) 348 | "if_expression"))))))) 349 | 350 | (defun scala-ts--indent-if-offset (node &rest _) 351 | "Return anchor position for NODE when PARENT is if_expression." 352 | (let ((offset scala-ts-indent-offset)) 353 | (cond 354 | ((or (and (string= (treesit-node-type node) 355 | "else") 356 | (string= (treesit-node-type (treesit-node-next-sibling node)) 357 | "if_expression")) 358 | (string= (treesit-node-type node) 359 | "else") 360 | (string= (treesit-node-type node) 361 | "then")) 362 | 0) 363 | 364 | ;; indented and non 365 | (t offset)))) 366 | 367 | (defun scala-ts--indent-error-anchor (node _parent bol) 368 | "Return anchor position for NODE at BOL where PARENT is ERROR." 369 | (save-excursion 370 | (let* ((node (or node (treesit-node-at bol)))) 371 | (pcase (treesit-node-type node) 372 | ("." 373 | (forward-line -1) 374 | (back-to-indentation) 375 | (let ((prev (treesit-node-at (point)))) 376 | (if (string= (treesit-node-type prev) 377 | "identifier") 378 | (treesit-node-start prev) 379 | (treesit-node-start prev)))) 380 | 381 | (_ 382 | (goto-char (treesit-node-start node)) 383 | (back-to-indentation) 384 | (point)))))) 385 | 386 | (defun scala-ts--indent-error-offset (node _parent bol) 387 | "Return anchor position for NODE at BOL where PARENT is ERROR." 388 | (save-excursion 389 | (let* ((offset scala-ts-indent-offset) 390 | (node (or node (treesit-node-at bol)))) 391 | (pcase (treesit-node-type node) 392 | ("." 393 | (forward-line -1) 394 | (back-to-indentation) 395 | (let ((prev (treesit-node-at (point)))) 396 | (if (string= (treesit-node-type prev) 397 | "identifier") 398 | offset 399 | 0))) 400 | 401 | ((rx (| scala-ts--indent-keywords scala-ts--indent ":") eol) 402 | offset) 403 | 404 | (_ 0))))) 405 | 406 | (defun scala-ts--indent-no-node-anchor (_node _parent _bol) 407 | "Return anchor position when node is nil with BOL." 408 | (save-excursion 409 | (let* ((pos (re-search-backward (rx (not (in control 410 | space 411 | blank))))) 412 | (last-node (treesit-node-at pos))) 413 | (pcase (treesit-node-type last-node) 414 | ("ERROR" 415 | (scala-ts--indent-error-anchor nil last-node pos)) 416 | 417 | ((rx scala-ts--indent-keywords eol) 418 | (goto-char (treesit-node-start last-node)) 419 | (back-to-indentation) 420 | (if (looking-at-p "end") 421 | (point) 422 | (goto-char (treesit-node-start last-node)) 423 | (when (member (treesit-node-type last-node) 424 | '("match" "yield" "then")) 425 | (back-to-indentation)) 426 | (point))) 427 | 428 | ((rx bol (| "template_body" "indented_block") eol) 429 | (goto-char (treesit-node-start (treesit-node-parent last-node))) 430 | (point)) 431 | 432 | (_ 433 | (goto-char (treesit-node-start last-node)) 434 | (back-to-indentation) 435 | (point)))))) 436 | 437 | (defun scala-ts--indent-no-node-offset (_node _parent _bol) 438 | "Return anchor position when node is nil with BOL." 439 | (save-excursion 440 | (let* ((offset scala-ts-indent-offset) 441 | (pos (re-search-backward (rx (not (in control 442 | space 443 | blank))))) 444 | (last-node (treesit-node-at pos))) 445 | (pcase (treesit-node-type last-node) 446 | ("ERROR" 447 | (scala-ts--indent-error-offset nil last-node pos)) 448 | 449 | ((rx scala-ts--indent-keywords eol) 450 | (goto-char (treesit-node-start last-node)) 451 | (back-to-indentation) 452 | (if (looking-at-p "end") 453 | 0 454 | offset)) 455 | 456 | ((rx scala-ts--indent eol) 457 | offset) 458 | 459 | ("identifier" 460 | (if (string-empty-p (treesit-node-text last-node)) 461 | offset 462 | 0)) 463 | 464 | ((rx bol (| "template_body" "indented_block") eol) 465 | offset) 466 | 467 | (_ 0))))) 468 | 469 | (defun scala-ts--move-out-of-indented-block (&rest _) 470 | "Correction when jumping at the beginning of a defun. 471 | If point is in \"indented_block\" move it at the beginning of the 472 | block. End search as soon as either \"indented_block\" is found 473 | or node matching `treesit-defun-type-regexp' is found." 474 | (let* ((pred (lambda (node) 475 | (let ((type (treesit-node-type node))) 476 | (or 477 | (string= "indented_block" type) 478 | (string-match-p treesit-defun-type-regexp type))))) 479 | (node (treesit-parent-until (treesit-node-at (point)) pred t))) 480 | (when (string= "indented_block" (treesit-node-type node)) 481 | (goto-char (treesit-node-start node))))) 482 | ;; END 483 | 484 | (defvar scala-ts--indent-rules 485 | (let ((offset scala-ts-indent-offset)) 486 | `((scala 487 | ((node-is "^comment$") no-indent 0) 488 | 489 | ((node-is "^}$") parent-bol 0) 490 | ((node-is "^)$") parent-bol 0) 491 | 492 | ((parent-is "^if_expression$") 493 | scala-ts--indent-if-anchor 494 | scala-ts--indent-if-offset) 495 | ;; Handle else-if 496 | ((n-p-gp "^postfix_expression$" "^indented_block$" "^if_expression$") grand-parent 0) 497 | 498 | ((n-p-gp "^enumerators$" "^for_expression$" nil) parent-bol ,offset) 499 | ((n-p-gp "^enumerator$" "^enumerators$" nil) parent 0) 500 | ((n-p-gp "^ERROR$" "^enumerators$" nil) prev-line ,(- offset)) 501 | ((n-p-gp "^yield$" "^for_expression$" nil) parent-bol 0) 502 | 503 | ((n-p-gp "^catch_clause$" "^try_expression$" nil) parent 0) 504 | ((n-p-gp "^finally_clause$" "^try_expression$" nil) parent 0) 505 | 506 | ((n-p-gp "^indented_cases$" "^match_expression" nil) parent-bol ,offset) 507 | ((n-p-gp "^case_clause$" "^indented_cases$" nil) parent 0) 508 | ((n-p-gp "^case_clause$" "^case_block$" nil) parent-bol ,offset) 509 | ((n-p-gp "[.]" "^field_expression$" "^case_clause$") prev-sibling 0) 510 | ((n-p-gp "^identifier$" "^case_clause$" nil) 511 | parent 512 | (lambda (node _parent _bol) 513 | (if (string= (treesit-node-text node) 514 | "finally") 515 | (- ,offset) 516 | ,offset))) 517 | ((parent-is "^case_clause$") parent-bol ,offset) 518 | 519 | ((node-is "^end$") scala-ts--indent-end 0) 520 | 521 | ;; Handle function annotations 522 | ((n-p-gp "^def$" "^function_definition$" nil) parent 0) 523 | 524 | ;; The beast, no-nodes (and ERROR nodes) 525 | ((n-p-gp ,(rx bol scala-ts--indent-keywords eol) 526 | "^ERROR$" 527 | nil) 528 | no-indent 529 | 0) 530 | ((parent-is "^ERROR$") 531 | scala-ts--indent-error-anchor 532 | scala-ts--indent-error-offset) 533 | (no-node scala-ts--indent-no-node-anchor 534 | scala-ts--indent-no-node-offset) 535 | 536 | ;; Normal definitions 537 | ((parent-is "^compilation_unit$") column-0 0) 538 | ((parent-is "definition$") parent-bol ,offset) 539 | ((parent-is "^lambda_expression$") parent-bol ,offset) 540 | ((parent-is "^enum_body$") parent-bol ,offset) 541 | ((n-p-gp nil "^template_body$" "definition$") grand-parent ,offset) 542 | ((parent-is "^template_body$") parent-bol ,offset) 543 | ((parent-is "^with_template_body$") parent-bol ,offset) 544 | ((parent-is "^field_expression$") parent-bol ,offset) 545 | ((parent-is "^class_parameters$") parent-bol ,offset) 546 | ((parent-is "^parameters$") parent-bol ,offset) 547 | ((parent-is "^arguments$") parent-bol ,offset) 548 | ((parent-is "^tuple_expression$") parent-bol ,offset) 549 | 550 | ((node-is "definition") prev-sibling 0) 551 | ((node-is "declaration") prev-sibling 0) 552 | ((node-is "^enum_body$") prev-sibling 0) 553 | ((node-is "^template_body$") prev-sibling 0) 554 | 555 | ((n-p-gp "^identifier$" "^indented_block$" nil) 556 | parent 557 | (lambda (node parent _bol) 558 | (if (member (treesit-node-text node) 559 | '("then" 560 | "catch" 561 | "else" 562 | "finally")) 563 | (- ,offset) 564 | 0))) 565 | 566 | ((n-p-gp "^call_expression$" "^indented_block$" nil) 567 | (lambda (node parent _bol) 568 | parent 569 | (if-let ((func-node (treesit-node-child-by-field-name 570 | node 571 | "function")) 572 | (is-member (member (treesit-node-text func-node) 573 | '("then" 574 | "catch" 575 | "else" 576 | "finally"))) 577 | (is-block (string= (treesit-node-type 578 | (treesit-node-next-sibling 579 | func-node)) 580 | "block"))) 581 | (- ,offset) 582 | 0))) 583 | 584 | ((n-p-gp "^indented_block$" "^ERROR$" nil) no-indent 0) 585 | ((parent-is "^indented_block$") parent 0) 586 | ((parent-is "^block$") parent-bol ,offset) 587 | ((node-is "^indented_block$") parent-bol ,offset) 588 | ((node-is "^block$") parent ,offset)))) 589 | "Tree-sitter indent rules for `scala-ts-mode'.") 590 | 591 | (defun scala-ts--defun-name (node) 592 | "Return the defun name of NODE. 593 | Return nil if there is no name or if NODE is not a defun node." 594 | (pcase (treesit-node-type node) 595 | ((or "class_definition" 596 | "trait_definition" 597 | "enum_definition" 598 | "object_definition" 599 | "full_enum_case" 600 | "simple_enum_case" 601 | "function_definition") 602 | (treesit-node-text 603 | (treesit-node-child-by-field-name node "name") 604 | t)) 605 | ("val_definition" 606 | (treesit-node-text 607 | (treesit-node-child-by-field-name node "pattern") 608 | t)) 609 | ("function_declaration" 610 | (treesit-node-text 611 | (treesit-node-child node 0) 612 | t)))) 613 | 614 | ;;;###autoload 615 | (define-derived-mode scala-ts-mode prog-mode " Scala (TS)" 616 | "Major mode for Scala files using tree-sitter." 617 | :group 'scala-ts 618 | :syntax-table scala-ts--syntax-table 619 | 620 | (when (treesit-ready-p 'scala) 621 | (treesit-parser-create 'scala) 622 | 623 | ;; Comments 624 | (setq-local comment-start "// ") 625 | (setq-local comment-end "") 626 | (setq-local comment-start-skip (rx "//" (* (syntax whitespace)))) 627 | 628 | (setq-local treesit-font-lock-settings scala-ts--treesit-font-lock-settings) 629 | ;; (setq-local treesit-range-settings scala-ts--treesit-range-settings) 630 | (setq-local treesit-font-lock-feature-list '((comment doc-comment definition) 631 | (keyword type) 632 | (import extra) 633 | (variable function operator literal interpolation))) 634 | 635 | 636 | (setq-local 637 | treesit-simple-indent-rules scala-ts--indent-rules) 638 | (setq-local electric-indent-chars (append electric-indent-chars '(?.))) 639 | 640 | ;; Navigation. 641 | (setq-local treesit-defun-type-regexp 642 | (rx (or "class_definition" 643 | "object_definition" 644 | "trait_definition" 645 | "function_definition" 646 | "val_definition"))) 647 | 648 | (setq-local treesit-defun-name-function #'scala-ts--defun-name) 649 | 650 | ;; TODO (could possibly be more complex?) 651 | (setq-local treesit-simple-imenu-settings 652 | `(("Class" "\\`class_definition\\'" nil nil) 653 | ("Trait" "\\`trait_definition\\'" nil nil) 654 | ("Enum" "\\`enum_definition\\'" nil nil) 655 | ("Object" "\\`object_definition\\'" nil nil) 656 | ("Function" "\\`function_definition\\'" nil nil) 657 | ("Definition" "\\`function_declaration'" nil nil))) 658 | 659 | (advice-add 'treesit-beginning-of-defun :before #'scala-ts--move-out-of-indented-block) 660 | 661 | (treesit-major-mode-setup))) 662 | 663 | ;;;###autoload 664 | (progn 665 | (add-to-list 'auto-mode-alist '("\\.scala\\'" . scala-ts-mode)) 666 | (add-to-list 'auto-mode-alist '("\\.sc\\'" . scala-ts-mode)) 667 | (add-to-list 'auto-mode-alist '("\\.sbt\\'" . scala-ts-mode))) 668 | 669 | (provide 'scala-ts-mode) 670 | ;;; scala-ts-mode.el ends here 671 | --------------------------------------------------------------------------------