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|
;;; jai-mode.el --- Major mode for JAI -*- lexical-binding: t; -*-
;; Copyright (C) 2015-2023 Kristoffer Grönlund
;; Copyright (C) 2023-2026 Valentin Ignatev
;; Initial author: Kristoffer Grönlund <k@ziran.se>
;; Current maintainer: Valentin Ignatev <mail@valigo.gg>
;; URL: https://github.com/valignatev/jai-mode
;; Version: 0.0.1
;; Package-Requires: ((emacs "26.1"))
;; Keywords: languages
;; This file is not 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Major mode for JAI
;;
;;; Code:
(require 'rx)
(require 'js)
(require 'compile)
(defconst jai-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?\" "\"" table)
(modify-syntax-entry ?\\ "\\" table)
;; additional symbols
(modify-syntax-entry ?_ "w" 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 ?? "." table)
;; Modify some syntax entries to allow nested block comments
(modify-syntax-entry ?/ ". 124b" table)
(modify-syntax-entry ?* ". 23n" table)
(modify-syntax-entry ?\n "> b" table)
(modify-syntax-entry ?\^m "> b" table)
table))
;; This is needed for correct directive indentation.
;; This jai-mode uses js-mode indentation, and it defines a bunch of C++-compatible crap
;; for whatever reason. You could ask "what does javascript mode have to do with C++ preprocessor?",
;; or "why does jai-mode use javascript indentation?".
;; And my answer to that is - senator, I don't know, I just work here.
;; This hack essentially turns those into "impossible" regexes
;; (a word boundary at the beginning (`\\_<`) immediately followed by a word boundary at the end (`\\_>`))
;; bypassing that codepath in js-mode entirely.
(defconst cpp-font-lock-keywords-source-directives "\\_<\\_>")
(defconst js--opt-cpp-start "\\_<\\_>")
(defconst js--macro-decl-re "\\_<\\_>")
(defconst jai-builtins
'("it" "it_index"))
(defconst jai-keywords
'("if" "ifx" "else" "then" "while" "for" "switch" "case" "struct" "enum"
"return" "remove" "continue" "break" "defer" "inline" "no_inline"
"using" "code_of" "initializer_of" "size_of" "type_of" "cast" "type_info"
"null" "true" "false" "xx" "context" "operator" "push_context" "is_constant"
"enum_flags" "union" "interface"))
(defconst jai-typenames
'("int" "u64" "u32" "u16" "u8"
"s64" "s32" "s16" "s8" "float"
"float32" "float64" "string"
"bool" "void"))
(defun jai-wrap-word-rx (s)
(concat "\\<" s "\\>"))
(defun jai-keywords-rx (keywords)
"build keyword regexp"
(jai-wrap-word-rx (regexp-opt keywords t)))
(defconst jai-dollar-type-rx (rx (group "$" (or (1+ word) (opt "$")))))
(defconst jai-number-rx
(rx (and
symbol-start
(or (and (+ digit) (opt (and (any "eE") (opt (any "-+")) (+ digit))))
(and "0" (any "xX") (+ hex-digit)))
(opt (and (any "_" "A-Z" "a-z") (* (any "_" "A-Z" "a-z" "0-9"))))
symbol-end)))
(defun jai-syntax-propertize-function (start end)
"Mark all heredoc regions as strings in the buffer."
(goto-char start)
;; If we're already inside a herestring we have to take care of that one first
(when-let* ((ppss (syntax-ppss))
(inside (eq t (nth 3 ppss)))
(start-pos (nth 8 ppss))
(tag (get-text-property start-pos 'here-string-marker)))
(when (re-search-forward (concat "^[[:space:]]*" (regexp-quote tag) "[[:punct:]]*.*$") end 'move)
(let ((end (match-end 0)))
(put-text-property (1- end) end 'syntax-table (string-to-syntax "|"))
)
))
(while (re-search-forward "#string +\\([a-zA-Z_][a-zA-Z0-9_]+\\)" end 'move)
(unless (nth 4 (syntax-ppss))
(let ((tag (match-string 1))
(beg (match-beginning 1)))
(unless (string= tag "CODE")
(put-text-property beg (1+ beg) 'here-string-marker tag)
(put-text-property beg (1+ beg) 'syntax-table (string-to-syntax "|"))
(when (re-search-forward (concat "^[[:space:]]*" "\\(" (regexp-quote tag) "\\)" "\\([[:space:]]*[[:punct:]]*.*$\\)") end 'move)
;; Apply string syntax to everything between the start and end of heredoc
(let ((end (match-end 1)))
(put-text-property (1- end) end 'syntax-table (string-to-syntax "|"))
))))
)
)
)
(defun jai-postfix-cast-syntax (limit)
"Font-lock matcher for cast syntax: foo.(Type).
Matches the .( and the closing ) with balanced parens in between,
and highlights the type name inside."
(let ((found nil))
(while (and (not found) (re-search-forward "\\.(" limit t))
(let ((open-paren-pos (1- (point)))
(cast-start (match-beginning 0)))
(save-excursion
(goto-char open-paren-pos)
;; Use forward-sexp to find the matching closing paren
(condition-case nil
(progn
(forward-sexp 1)
(let ((close-paren-pos (point))
(inner-start (1+ open-paren-pos))
(inner-end (1- (point)))
(type-start nil)
(type-end nil))
;; Look for the last word in the cast expression
(goto-char inner-start)
(while (re-search-forward "\\([[:word:]]+\\)" inner-end t)
(setq type-start (match-beginning 1))
(setq type-end (match-end 1)))
;; Store the positions for font-lock
(set-match-data (list cast-start close-paren-pos
cast-start (+ cast-start 2) ; subgroup 1: .(
(1- close-paren-pos) close-paren-pos ; subgroup 2: )
type-start type-end)) ; subgroup 3: Type (or nil if no word found)
(setq found t)))
(error nil))))) ; If forward-sexp fails, continue searching
found))
(defconst jai-font-lock-defaults
`(;; .() Cast syntax - put this FIRST so it has priority
;; Matching the type inside of .() is hacky.
;; It breaks apart with things like foo.(get_type(baz=bark))
(jai-postfix-cast-syntax
(1 font-lock-keyword-face)
(2 font-lock-keyword-face)
(3 font-lock-type-face))
;; Keywords
(,(jai-keywords-rx jai-keywords) 1 font-lock-keyword-face)
;; single quote characters
("\\('[[:word:]]\\)\\>" 1 font-lock-constant-face)
;; Variables
(,(jai-keywords-rx jai-builtins) 1 font-lock-variable-name-face)
;; Hash directives
("#\\w+" . font-lock-preprocessor-face)
;; At notes
("@\\w+" . font-lock-preprocessor-face)
;; Strings
("\\\".*\\\"" . font-lock-string-face)
;; Numbers
(,(jai-wrap-word-rx jai-number-rx) . font-lock-constant-face)
;; Procedure names
("\\([[:word:]]+\\)[[:space:]]*:[[:space:]]*:?[[:space:]]*\\(inline\\|#type\\)?[[:space:]]*\(" 1 font-lock-function-name-face)
;; Types
(,(jai-keywords-rx jai-typenames) 1 font-lock-type-face)
(,jai-dollar-type-rx 1 font-lock-type-face)
;; Foo.{} and bar.[] matching
("\\([[:word:]]+\\)\\.\\(\{\\|\\[\\)" 1 font-lock-type-face)
("\\([[:word:]]+\\)[[:space:]]*:[[:space:]]*:[[:space:]]*\\(struct\\|enum\\|union\\|#type,\\)" 1 font-lock-type-face)
;; TODO: This detects false-positives in case of `for it_index, it: foo`, it thinks that foo is a type.
;; Emacs regexes do not support negative lookaheads, so I'd need to add proper logic to jai-syntax-propertize-function
;; but it's too hard for now. Oh well!
("[[:word:]]+[[:space:]]*:[[:space:]]*\\**\\(\\[[[:word:]]*\\]\\|\\[\\.\\.\\]\\)?*[[:space:]]*\\**[[:space:]]*\\([[:word:]]+\\)" 2 font-lock-type-face)
("---" . font-lock-constant-face)
))
;; add setq-local for older emacs versions
(unless (fboundp 'setq-local)
(defmacro setq-local (var val)
`(set (make-local-variable ',var) ,val)))
(defconst jai--defun-rx "\(.*\).*\{")
(defmacro jai-paren-level ()
`(car (syntax-ppss)))
(defun jai-line-is-defun ()
"return t if current line begins a procedure"
(interactive)
(save-excursion
(beginning-of-line)
(let (found)
(while (and (not (eolp)) (not found))
(if (looking-at jai--defun-rx)
(setq found t)
(forward-char 1)))
found)))
(defun jai-beginning-of-defun ()
"Go to line on which current function starts."
(interactive)
(let ((orig-level (jai-paren-level)))
(while (and
(not (jai-line-is-defun))
(not (bobp))
(> orig-level 0))
(setq orig-level (jai-paren-level))
(while (>= (jai-paren-level) orig-level)
(skip-chars-backward "^{")
(backward-char))))
(when (jai-line-is-defun)
(beginning-of-line)))
(defun jai-end-of-defun ()
"Go to line on which current function ends."
(interactive)
(let ((orig-level (jai-paren-level)))
(when (> orig-level 0)
(jai-beginning-of-defun)
(end-of-line)
(setq orig-level (jai-paren-level))
(skip-chars-forward "^}")
(while (>= (jai-paren-level) orig-level)
(skip-chars-forward "^}")
(forward-char)))))
(defalias 'jai-parent-mode
(if (fboundp 'prog-mode) 'prog-mode 'fundamental-mode))
;; imenu hookup
(add-hook 'jai-mode-hook
(lambda ()
(setq imenu-generic-expression
'(("type" "^\\(.*:*.*\\) : " 1)
("function" "^\\(.*\\) :: " 1)
("struct" "^\\(.*\\) *:: *\\(struct\\)\\(.*\\){" 1)))))
;; NOTE: taken from the scala-indent package and modified for Jai.
;; Still uses the js-indent-line as a base, which will have to be
;; replaced when the language is more mature.
(defun jai--indent-on-parentheses ()
(when (and (= (char-syntax (char-before)) ?\))
(= (save-excursion (back-to-indentation) (point)) (1- (point))))
(js-indent-line)))
(defun jai--add-self-insert-hooks ()
(add-hook 'post-self-insert-hook
'jai--indent-on-parentheses))
;;;###autoload
(define-derived-mode jai-mode jai-parent-mode "Jai"
:syntax-table jai-mode-syntax-table
:group 'jai
(setq bidi-paragraph-direction 'left-to-right)
(setq-local require-final-newline mode-require-final-newline)
(setq-local parse-sexp-ignore-comments t)
(setq-local comment-start-skip "\\(//+\\|/\\*+\\)\\s *")
(setq-local comment-start "//")
(setq-local block-comment-start "/*")
(setq-local block-comment-end "*/")
(setq-local indent-line-function 'js-indent-line)
(setq-local font-lock-defaults '(jai-font-lock-defaults))
(setq-local beginning-of-defun-function 'jai-beginning-of-defun)
(setq-local end-of-defun-function 'jai-end-of-defun)
(setq-local syntax-propertize-function 'jai-syntax-propertize-function)
;; add indent functionality to some characters
(jai--add-self-insert-hooks)
(font-lock-ensure))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.jai\\'" . jai-mode))
(defconst jai--error-regexp
"\\([^ \n:]+.*\.jai\\):\\([0-9]+\\),\\([0-9]+\\):")
(push `(jai ,jai--error-regexp 1 2 3 2) compilation-error-regexp-alist-alist)
(push 'jai compilation-error-regexp-alist)
(provide 'jai-mode)
;;; jai-mode.el ends here
|
