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;;; prog-mode.el --- Generic major mode for programming -*- lexical-binding: t -*-
;; Copyright (C) 2013 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
;; Package: emacs
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This major mode is mostly intended as a parent of other programming
;; modes. All major modes for programming languages should derive from this
;; mode so that users can put generic customization on prog-mode-hook.
;;; Code:
(eval-when-compile (require 'cl-lib))
(defgroup prog-mode nil
"Generic programming mode, from which others derive."
:group 'languages)
(defvar prog-mode-map
(let ((map (make-sparse-keymap)))
(define-key map [?\C-\M-q] 'prog-indent-sexp)
map)
"Keymap used for programming modes.")
(defun prog-indent-sexp (&optional defun)
"Indent the expression after point.
When interactively called with prefix, indent the enclosing defun
instead."
(interactive "P")
(save-excursion
(when defun
(end-of-line)
(beginning-of-defun))
(let ((start (point))
(end (progn (forward-sexp 1) (point))))
(indent-region start end nil))))
(defvar prog-prettify-symbols-alist nil)
(defcustom prog-prettify-symbols nil
"Whether symbols should be prettified.
When set to an alist in the form `((STRING . CHARACTER)...)' it
will augment the mode's native prettify alist."
:type '(choice
(const :tag "No thanks" nil)
(const :tag "Mode defaults" t)
(alist :tag "Mode defaults augmented with your own list"
:key-type string :value-type character))
:version "24.4")
(defun prog--prettify-font-lock-compose-symbol (alist)
"Compose a sequence of ascii chars into a symbol.
Regexp match data 0 points to the chars."
;; Check that the chars should really be composed into a symbol.
(let* ((start (match-beginning 0))
(end (match-end 0))
(syntaxes (if (eq (char-syntax (char-after start)) ?w)
'(?w) '(?. ?\\)))
match)
(if (or (memq (char-syntax (or (char-before start) ?\ )) syntaxes)
(memq (char-syntax (or (char-after end) ?\ )) syntaxes)
;; syntax-ppss could modify the match data (bug#14595)
(progn (setq match (match-string 0)) (nth 8 (syntax-ppss))))
;; No composition for you. Let's actually remove any composition
;; we may have added earlier and which is now incorrect.
(remove-text-properties start end '(composition))
;; That's a symbol alright, so add the composition.
(compose-region start end (cdr (assoc match alist)))))
;; Return nil because we're not adding any face property.
nil)
(defun prog-prettify-font-lock-symbols-keywords ()
(when prog-prettify-symbols
(let ((alist (append prog-prettify-symbols-alist
(if (listp prog-prettify-symbols)
prog-prettify-symbols
nil))))
`((,(regexp-opt (mapcar 'car alist) t)
(0 (prog--prettify-font-lock-compose-symbol ',alist)))))))
(defun prog-prettify-install (alist)
"Install prog-mode support to prettify symbols according to ALIST.
ALIST is in the format `((STRING . CHARACTER)...)' like
`prog-prettify-symbols'.
Internally, `font-lock-add-keywords' is called."
(setq-local prog-prettify-symbols-alist alist)
(let ((keywords (prog-prettify-font-lock-symbols-keywords)))
(if keywords (font-lock-add-keywords nil keywords))))
;;;###autoload
(define-derived-mode prog-mode fundamental-mode "Prog"
"Major mode for editing programming language source code."
(set (make-local-variable 'require-final-newline) mode-require-final-newline)
(set (make-local-variable 'parse-sexp-ignore-comments) t)
;; Any programming language is always written left to right.
(setq bidi-paragraph-direction 'left-to-right))
(provide 'prog-mode)
;;; prog-mode.el ends here
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