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haskell-c2hs.el
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haskell-c2hs.el
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;; haskell-c2hs.el --- -*- lexical-binding: t; -*-
;; Copyright (C) 2016 Sergey Vinokurov
;;
;; Author: Sergey Vinokurov <serg.foo@gmail.com>
;; Created: Monday, 7 March 2016
;; 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:
;; This mode is mostly intended for highlighting {#...#} hooks.
;;
;; Quick setup:
;; (autoload 'haskell-c2hs-mode "haskell-c2hs-mode" nil t)
;; (add-to-list 'auto-mode-alist '("\\.chs\\'" . haskell-c2hs-mode))
;;
(require 'haskell-mode)
(require 'haskell-font-lock)
(require 'haskell-utils)
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.chs\\'" . haskell-c2hs-mode))
(defface haskell-c2hs-hook-pair-face
'((t (:inherit 'font-lock-preprocessor-face)))
"Face for highlighting {#...#} pairs."
:group 'haskell)
(defface haskell-c2hs-hook-name-face
'((t (:inherit 'font-lock-keyword-face)))
"Face for highlighting c2hs hook names."
:group 'haskell)
(defvar haskell-c2hs-font-lock-keywords
`((,(eval-when-compile
(let* ((ws '(any ?\s ?\t ?\n ?\r))
(anychar '(or (not (any ?#))
(seq "#"
(not (any ?\})))))
(any-nonquote '(or (not (any ?# ?\"))
(seq "#"
(not (any ?\} ?\")))))
(cid '(seq (any (?a . ?z) (?A . ?Z) ?_)
(* (any (?a . ?z) (?A . ?Z) (?0 . ?9) ?_))))
(hsid-type '(seq (? "'")
(any (?A . ?Z))
(* (any (?a . ?z) (?A . ?Z) (?0 . ?9) ?_ ?'))))
(equals-str-val `(seq (* ,ws)
"="
(* ,ws)
"\""
(* ,any-nonquote)
"\"")))
(eval
`(rx
(seq
(group-n 1 "{#")
(* ,ws)
(or (seq (group-n 2
"import"
(opt (+ ,ws)
"qualified"))
(+ ,ws))
(seq (group-n 2
"context")
(opt (+ ,ws)
(group-n 3
"lib")
,equals-str-val)
(opt (+ ,ws)
(group-n 4
"prefix")
,equals-str-val)
(opt (+ ,ws)
(group-n 5
"add"
(+ ,ws)
"prefix")
,equals-str-val))
(seq (group-n 2
"type")
(+ ,ws)
,cid)
(seq (group-n 2
"sizeof")
(+ ,ws)
,cid)
(seq (group-n 2
"enum"
(+ ,ws)
"define")
(+ ,ws)
,cid)
;; TODO: vanilla enum fontification is incomplete
(seq (group-n 2
"enum")
(+ ,ws)
,cid
(opt (+ ,ws)
(group-n 3
"as")))
;; TODO: fun hook highlighting is incomplete
(seq (group-n 2
(or "call"
"fun")
(opt (+ ,ws)
"pure")
(opt (+ ,ws)
"unsafe"))
(+ ,ws)
,cid
(opt (+ ,ws)
(group-n 3
"as")
(opt (+ ,ws)
(group-n 8
"^"))))
(group-n 2
"get")
(group-n 2
"set")
(seq (group-n 2
"pointer")
(or (seq (* ,ws)
(group-n 3 "*")
(* ,ws))
(+ ,ws))
,cid
(opt (+ ,ws)
(group-n 4 "as")
(+ ,ws)
,hsid-type)
(opt (+ ,ws)
(group-n 5
(or "foreign"
"stable")))
(opt
(or (seq (+ ,ws)
(group-n 6
"newtype"))
(seq (* ,ws)
"->"
(* ,ws)
,hsid-type)))
(opt (+ ,ws)
(group-n 7
"nocode")))
(group-n 2
"class")
(group-n 2
"alignof")
(group-n 2
"offsetof")
(seq (group-n 2
"const")
(+ ,ws)
,cid)
(seq (group-n 2
"typedef")
(+ ,ws)
,cid
(+ ,ws)
,hsid-type)
(group-n 2
"nonGNU")
;; TODO: default hook not implemented
)
(* ,anychar)
(group-n 9 "#}"))))))
;; Override highlighting for pairs in order to always distinguish them.
(1 'haskell-c2hs-hook-pair-face t)
(2 'haskell-c2hs-hook-name-face)
;; Make matches lax, i.e. do not signal error if nothing
;; matched.
(3 'haskell-c2hs-hook-name-face nil t)
(4 'haskell-c2hs-hook-name-face nil t)
(5 'haskell-c2hs-hook-name-face nil t)
(6 'haskell-c2hs-hook-name-face nil t)
(7 'haskell-c2hs-hook-name-face nil t)
(8 'font-lock-negation-char-face nil t)
;; Override highlighting for pairs in order to always distinguish them.
(9 'haskell-c2hs-hook-pair-face t))
,@(haskell-font-lock-keywords)))
;;;###autoload
(define-derived-mode haskell-c2hs-mode haskell-mode "C2HS"
"Mode for editing *.chs files of the c2hs haskell tool."
(setq-local font-lock-defaults
(cons 'haskell-c2hs-font-lock-keywords
(cdr font-lock-defaults))))
(provide 'haskell-c2hs)
;; haskell-c2hs.el ends here