;;; typescript-ts-mode.el --- tree sitter support for TypeScript -*- lexical-binding: t; -*- ;; Copyright (C) 2022-2023 Free Software Foundation, Inc. ;; Author : Theodor Thornhill ;; Maintainer : Theodor Thornhill ;; Created : October 2022 ;; Keywords : typescript tsx 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 . ;;; Commentary: ;; ;;; Code: (require 'treesit) (require 'js) (eval-when-compile (require 'rx)) (require 'c-ts-common) ; For comment indent and filling. (declare-function treesit-parser-create "treesit.c") (defcustom typescript-ts-mode-indent-offset 2 "Number of spaces for each indentation step in `typescript-ts-mode'." :version "29.1" :type 'integer :safe 'integerp :group 'typescript) (defvar typescript-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 ?\240 "." table) (modify-syntax-entry ?/ ". 124b" table) (modify-syntax-entry ?* ". 23" table) (modify-syntax-entry ?\n "> b" table) (modify-syntax-entry ?\^m "> b" table) (modify-syntax-entry ?$ "_" table) (modify-syntax-entry ?` "\"" table) table) "Syntax table for `typescript-ts-mode'.") (defun typescript-ts-mode--indent-rules (language) "Rules used for indentation. Argument LANGUAGE is either `typescript' or `tsx'." `((,language ((parent-is "program") point-min 0) ((node-is "}") parent-bol 0) ((node-is ")") parent-bol 0) ((node-is "]") parent-bol 0) ((node-is ">") parent-bol 0) ((and (parent-is "comment") c-ts-common-looking-at-star) c-ts-common-comment-start-after-first-star -1) ((parent-is "comment") prev-adaptive-prefix 0) ((parent-is "ternary_expression") parent-bol typescript-ts-mode-indent-offset) ((parent-is "member_expression") parent-bol typescript-ts-mode-indent-offset) ((parent-is "named_imports") parent-bol typescript-ts-mode-indent-offset) ((parent-is "statement_block") parent-bol typescript-ts-mode-indent-offset) ((parent-is "switch_case") parent-bol typescript-ts-mode-indent-offset) ((parent-is "switch_default") parent-bol typescript-ts-mode-indent-offset) ((parent-is "type_arguments") parent-bol typescript-ts-mode-indent-offset) ((parent-is "variable_declarator") parent-bol typescript-ts-mode-indent-offset) ((parent-is "arguments") parent-bol typescript-ts-mode-indent-offset) ((parent-is "array") parent-bol typescript-ts-mode-indent-offset) ((parent-is "formal_parameters") parent-bol typescript-ts-mode-indent-offset) ((parent-is "template_string") no-indent) ; Don't indent the string contents. ((parent-is "template_substitution") parent-bol typescript-ts-mode-indent-offset) ((parent-is "object_pattern") parent-bol typescript-ts-mode-indent-offset) ((parent-is "object") parent-bol typescript-ts-mode-indent-offset) ((parent-is "object_type") parent-bol typescript-ts-mode-indent-offset) ((parent-is "enum_body") parent-bol typescript-ts-mode-indent-offset) ((parent-is "class_body") parent-bol typescript-ts-mode-indent-offset) ((parent-is "arrow_function") parent-bol typescript-ts-mode-indent-offset) ((parent-is "parenthesized_expression") parent-bol typescript-ts-mode-indent-offset) ((parent-is "binary_expression") parent-bol typescript-ts-mode-indent-offset) ,@(when (eq language 'tsx) `(((match "<" "jsx_fragment") parent 0) ((parent-is "jsx_fragment") parent typescript-ts-mode-indent-offset) ((node-is "jsx_closing_element") parent 0) ((match "jsx_element" "statement") parent typescript-ts-mode-indent-offset) ((parent-is "jsx_element") parent typescript-ts-mode-indent-offset) ((parent-is "jsx_text") parent-bol typescript-ts-mode-indent-offset) ((parent-is "jsx_opening_element") parent typescript-ts-mode-indent-offset) ((parent-is "jsx_expression") parent-bol typescript-ts-mode-indent-offset) ((match "/" "jsx_self_closing_element") parent 0) ((parent-is "jsx_self_closing_element") parent typescript-ts-mode-indent-offset))) ;; FIXME(Theo): This no-node catch-all should be removed. When is it needed? (no-node parent-bol 0)))) (defvar typescript-ts-mode--keywords '("!" "abstract" "as" "async" "await" "break" "case" "catch" "class" "const" "continue" "debugger" "declare" "default" "delete" "do" "else" "enum" "export" "extends" "finally" "for" "from" "function" "get" "if" "implements" "import" "in" "instanceof" "interface" "keyof" "let" "namespace" "new" "of" "private" "protected" "public" "readonly" "return" "set" "static" "switch" "target" "throw" "try" "type" "typeof" "var" "void" "while" "with" "yield") "TypeScript keywords for tree-sitter font-locking.") (defvar typescript-ts-mode--operators '("=" "+=" "-=" "*=" "/=" "%=" "**=" "<<=" ">>=" ">>>=" "&=" "^=" "|=" "&&=" "||=" "??=" "==" "!=" "===" "!==" ">" ">=" "<" "<=" "+" "-" "*" "/" "%" "++" "--" "**" "&" "|" "^" "~" "<<" ">>" ">>>" "&&" "||" "!" "?.") "TypeScript operators for tree-sitter font-locking.") (defun typescript-ts-mode--font-lock-settings (language) "Tree-sitter font-lock settings. Argument LANGUAGE is either `typescript' or `tsx'." (treesit-font-lock-rules :language language :feature 'comment `((comment) @font-lock-comment-face) :language language :feature 'constant `(((identifier) @font-lock-constant-face (:match "^[A-Z_][A-Z_\\d]*$" @font-lock-constant-face)) [(true) (false) (null)] @font-lock-constant-face) :language language :feature 'keyword `([,@typescript-ts-mode--keywords] @font-lock-keyword-face [(this) (super)] @font-lock-keyword-face) :language language :feature 'string `((regex pattern: (regex_pattern)) @font-lock-regexp-face (string) @font-lock-string-face (template_string) @js--fontify-template-string (template_substitution ["${" "}"] @font-lock-misc-punctuation-face)) :language language :override t ;; for functions assigned to variables :feature 'declaration `((function name: (identifier) @font-lock-function-name-face) (function_declaration name: (identifier) @font-lock-function-name-face) (method_definition name: (property_identifier) @font-lock-function-name-face) (method_signature name: (property_identifier) @font-lock-function-name-face) (required_parameter (identifier) @font-lock-variable-name-face) (optional_parameter (identifier) @font-lock-variable-name-face) (variable_declarator name: (identifier) @font-lock-function-name-face value: [(function) (arrow_function)]) (variable_declarator name: (identifier) @font-lock-variable-name-face) (enum_declaration (identifier) @font-lock-type-face) (extends_clause value: (identifier) @font-lock-type-face) ;; extends React.Component (extends_clause value: (member_expression object: (identifier) @font-lock-type-face property: (property_identifier) @font-lock-type-face)) (arrow_function parameter: (identifier) @font-lock-variable-name-face) (variable_declarator name: (array_pattern (identifier) (identifier) @font-lock-function-name-face) value: (array (number) (function))) (catch_clause parameter: (identifier) @font-lock-variable-name-face) ;; full module imports (import_clause (identifier) @font-lock-variable-name-face) ;; named imports with aliasing (import_clause (named_imports (import_specifier alias: (identifier) @font-lock-variable-name-face))) ;; named imports without aliasing (import_clause (named_imports (import_specifier !alias name: (identifier) @font-lock-variable-name-face))) ;; full namespace import (* as alias) (import_clause (namespace_import (identifier) @font-lock-variable-name-face))) :language language :feature 'identifier `((nested_type_identifier module: (identifier) @font-lock-type-face) (type_identifier) @font-lock-type-face (predefined_type) @font-lock-type-face (new_expression constructor: (identifier) @font-lock-type-face) (enum_body (property_identifier) @font-lock-type-face) (enum_assignment name: (property_identifier) @font-lock-type-face) (variable_declarator name: (identifier) @font-lock-variable-name-face) (for_in_statement left: (identifier) @font-lock-variable-name-face) (arrow_function parameters: [(_ (identifier) @font-lock-variable-name-face) (_ (_ (identifier) @font-lock-variable-name-face)) (_ (_ (_ (identifier) @font-lock-variable-name-face)))])) :language language :feature 'property `((property_signature name: (property_identifier) @font-lock-property-name-face) (public_field_definition name: (property_identifier) @font-lock-property-name-face) (pair key: (property_identifier) @font-lock-property-ref-face) ((shorthand_property_identifier) @font-lock-property-ref-face)) :language language :feature 'expression '((assignment_expression left: [(identifier) @font-lock-function-name-face (member_expression property: (property_identifier) @font-lock-function-name-face)] right: [(function) (arrow_function)])) :language language :feature 'function '((call_expression function: [(identifier) @font-lock-function-call-face (member_expression property: (property_identifier) @font-lock-function-call-face)])) :language language :feature 'pattern `((pair_pattern key: (property_identifier) @font-lock-property-ref-face value: [(identifier) @font-lock-variable-name-face (assignment_pattern left: (identifier) @font-lock-variable-name-face)]) (array_pattern (identifier) @font-lock-variable-name-face) ((shorthand_property_identifier_pattern) @font-lock-variable-name-face)) :language language :feature 'jsx `((jsx_opening_element [(nested_identifier (identifier)) (identifier)] @font-lock-function-call-face) (jsx_closing_element [(nested_identifier (identifier)) (identifier)] @font-lock-function-call-face) (jsx_self_closing_element [(nested_identifier (identifier)) (identifier)] @font-lock-function-call-face) (jsx_attribute (property_identifier) @font-lock-constant-face)) :language language :feature 'number `((number) @font-lock-number-face ((identifier) @font-lock-number-face (:match "^\\(:?NaN\\|Infinity\\)$" @font-lock-number-face))) :language language :feature 'operator `([,@typescript-ts-mode--operators] @font-lock-operator-face (ternary_expression ["?" ":"] @font-lock-operator-face)) :language language :feature 'bracket '((["(" ")" "[" "]" "{" "}"]) @font-lock-bracket-face) :language language :feature 'delimiter '((["," "." ";" ":"]) @font-lock-delimiter-face) :language language :feature 'escape-sequence :override t '((escape_sequence) @font-lock-escape-face))) ;;;###autoload (define-derived-mode typescript-ts-base-mode prog-mode "TypeScript" "Major mode for editing TypeScript." :group 'typescript :syntax-table typescript-ts-mode--syntax-table ;; Comments. (c-ts-common-comment-setup) ;; Electric (setq-local electric-indent-chars (append "{}():;,<>/" electric-indent-chars)) (setq-local electric-layout-rules '((?\; . after) (?\{ . after) (?\} . before))) ;; Navigation. (setq-local treesit-defun-type-regexp (regexp-opt '("class_declaration" "method_definition" "function_declaration" "lexical_declaration"))) (setq-local treesit-defun-name-function #'js--treesit-defun-name) ;; Imenu (same as in `js-ts-mode'). (setq-local treesit-simple-imenu-settings `(("Function" "\\`function_declaration\\'" nil nil) ("Variable" "\\`lexical_declaration\\'" js--treesit-valid-imenu-entry nil) ("Class" ,(rx bos (or "class_declaration" "method_definition") eos) nil nil)))) ;;;###autoload (define-derived-mode typescript-ts-mode typescript-ts-base-mode "TypeScript" "Major mode for editing TypeScript." :group 'typescript :syntax-table typescript-ts-mode--syntax-table (when (treesit-ready-p 'typescript) (treesit-parser-create 'typescript) ;; Indent. (setq-local treesit-simple-indent-rules (typescript-ts-mode--indent-rules 'typescript)) ;; Font-lock. (setq-local treesit-font-lock-settings (typescript-ts-mode--font-lock-settings 'typescript)) (setq-local treesit-font-lock-feature-list '((comment declaration) (keyword string escape-sequence) (constant expression identifier number pattern property) (function bracket delimiter))) (treesit-major-mode-setup))) (if (treesit-ready-p 'typescript) (add-to-list 'auto-mode-alist '("\\.ts\\'" . typescript-ts-mode))) ;;;###autoload (define-derived-mode tsx-ts-mode typescript-ts-base-mode "TypeScript[TSX]" "Major mode for editing TypeScript." :group 'typescript :syntax-table typescript-ts-mode--syntax-table (when (treesit-ready-p 'tsx) (treesit-parser-create 'tsx) ;; Comments. (setq-local comment-start "// ") (setq-local comment-end "") (setq-local comment-start-skip (rx (or (seq "/" (+ "/")) (seq "/" (+ "*"))) (* (syntax whitespace)))) (setq-local comment-end-skip (rx (* (syntax whitespace)) (group (or (syntax comment-end) (seq (+ "*") "/"))))) ;; Indent. (setq-local treesit-simple-indent-rules (typescript-ts-mode--indent-rules 'tsx)) ;; Font-lock. (setq-local treesit-font-lock-settings (typescript-ts-mode--font-lock-settings 'tsx)) (setq-local treesit-font-lock-feature-list '((comment declaration) (keyword string escape-sequence) (constant expression identifier jsx number pattern property) (function bracket delimiter))) (treesit-major-mode-setup))) (if (treesit-ready-p 'tsx) (add-to-list 'auto-mode-alist '("\\.tsx\\'" . tsx-ts-mode))) (provide 'typescript-ts-mode) ;;; typescript-ts-mode.el ends here