-;; Scheme mode, and its idiosyncratic commands.
-;; Copyright (C) 1986, 1987, 1988 Free Software Foundation, Inc.
-;; Adapted from Lisp mode by Bill Rozas, jinx@prep.
+;;; scheme.el --- Scheme (and DSSSL) editing mode
+
+;; Copyright (C) 1986, 1987, 1988, 1997, 1998, 2001, 2002, 2003, 2004, 2005,
+;; 2006 Free Software Foundation, Inc.
+
+;; Author: Bill Rozas <jinx@martigny.ai.mit.edu>
+;; Adapted-by: Dave Love <d.love@dl.ac.uk>
+;; Keywords: languages, lisp
;; 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 1, or (at your option)
+;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
-;; Initially a query replace of Lisp mode, except for the indentation
-;; of special forms. Probably the code should be merged at some point
-;; so that there is sharing between both libraries.
-
-;;; $Header: scheme.el,v 1.7 88/07/15 20:20:00 GMT cph Exp $
-
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; The major mode for editing Scheme-type Lisp code, very similar to
+;; the Lisp mode documented in the Emacs manual. `dsssl-mode' is a
+;; variant of scheme-mode for editing DSSSL specifications for SGML
+;; documents. [As of Apr 1997, some pointers for DSSSL may be found,
+;; for instance, at <URL:http://www.sil.org/sgml/related.html#dsssl>.]
+;; All these Lisp-ish modes vary basically in details of the language
+;; syntax they highlight/indent/index, but dsssl-mode uses "^;;;" as
+;; the page-delimiter since ^L isn't normally a legal SGML character.
+;;
+;; For interacting with a Scheme interpreter See also `run-scheme' in
+;; the `cmuscheme' package and also the implementation-specific
+;; `xscheme' package.
+
+;; Here's a recipe to generate a TAGS file for DSSSL, by the way:
+;; etags --lang=scheme --regex='/[ \t]*(\(mode\|element\)[ \t
+;; ]+\([^ \t(
+;; ]+\)/\2/' --regex='/[ \t]*(element[ \t
+;; ]*([^)]+[ \t
+;; ]+\([^)]+\)[ \t
+;; ]*)/\1/' --regex='/(declare[^ \t
+;; ]*[ \t
+;; ]+\([^ \t
+;; ]+\)/\1/' "$@"
+
+;;; Code:
\f
-(defvar scheme-mode-syntax-table nil "")
-(if (not scheme-mode-syntax-table)
- (let ((i 0))
- (setq scheme-mode-syntax-table (make-syntax-table))
- (set-syntax-table scheme-mode-syntax-table)
-
- ;; Default is atom-constituent.
- (while (< i 256)
- (modify-syntax-entry i "_ ")
- (setq i (1+ i)))
-
- ;; Word components.
- (setq i ?0)
- (while (<= i ?9)
- (modify-syntax-entry i "w ")
- (setq i (1+ i)))
- (setq i ?A)
- (while (<= i ?Z)
- (modify-syntax-entry i "w ")
- (setq i (1+ i)))
- (setq i ?a)
- (while (<= i ?z)
- (modify-syntax-entry i "w ")
- (setq i (1+ i)))
-
- ;; Whitespace
- (modify-syntax-entry ?\t " ")
- (modify-syntax-entry ?\n "> ")
- (modify-syntax-entry ?\f " ")
- (modify-syntax-entry ?\r " ")
- (modify-syntax-entry ? " ")
-
- ;; These characters are delimiters but otherwise undefined.
- ;; Brackets and braces balance for editing convenience.
- (modify-syntax-entry ?[ "(] ")
- (modify-syntax-entry ?] ")[ ")
- (modify-syntax-entry ?{ "(} ")
- (modify-syntax-entry ?} "){ ")
- (modify-syntax-entry ?\| " 23")
-
- ;; Other atom delimiters
- (modify-syntax-entry ?\( "() ")
- (modify-syntax-entry ?\) ")( ")
- (modify-syntax-entry ?\; "< ")
- (modify-syntax-entry ?\" "\" ")
- (modify-syntax-entry ?' " p")
- (modify-syntax-entry ?` " p")
-
- ;; Special characters
- (modify-syntax-entry ?, "_ p")
- (modify-syntax-entry ?@ "_ p")
- (modify-syntax-entry ?# "_ p14")
- (modify-syntax-entry ?\\ "\\ ")))
+(require 'lisp-mode)
+
+(defvar scheme-mode-syntax-table
+ (let ((st (make-syntax-table))
+ (i 0))
+
+ ;; Default is atom-constituent.
+ (while (< i 256)
+ (modify-syntax-entry i "_ " st)
+ (setq i (1+ i)))
+
+ ;; Word components.
+ (setq i ?0)
+ (while (<= i ?9)
+ (modify-syntax-entry i "w " st)
+ (setq i (1+ i)))
+ (setq i ?A)
+ (while (<= i ?Z)
+ (modify-syntax-entry i "w " st)
+ (setq i (1+ i)))
+ (setq i ?a)
+ (while (<= i ?z)
+ (modify-syntax-entry i "w " st)
+ (setq i (1+ i)))
+
+ ;; Whitespace
+ (modify-syntax-entry ?\t " " st)
+ (modify-syntax-entry ?\n "> " st)
+ (modify-syntax-entry ?\f " " st)
+ (modify-syntax-entry ?\r " " st)
+ (modify-syntax-entry ?\s " " st)
+
+ ;; These characters are delimiters but otherwise undefined.
+ ;; Brackets and braces balance for editing convenience.
+ (modify-syntax-entry ?\[ "(] " st)
+ (modify-syntax-entry ?\] ")[ " st)
+ (modify-syntax-entry ?{ "(} " st)
+ (modify-syntax-entry ?} "){ " st)
+ (modify-syntax-entry ?\| "\" 23bn" st)
+ ;; Guile allows #! ... !# comments.
+ ;; But SRFI-22 defines the comment as #!...\n instead.
+ ;; Also Guile says that the !# should be on a line of its own.
+ ;; It's too difficult to get it right, for too little benefit.
+ ;; (modify-syntax-entry ?! "_ 2" st)
+
+ ;; Other atom delimiters
+ (modify-syntax-entry ?\( "() " st)
+ (modify-syntax-entry ?\) ")( " st)
+ ;; It's used for single-line comments as well as for #;(...) sexp-comments.
+ (modify-syntax-entry ?\; "< 2 " st)
+ (modify-syntax-entry ?\" "\" " st)
+ (modify-syntax-entry ?' "' " st)
+ (modify-syntax-entry ?` "' " st)
+
+ ;; Special characters
+ (modify-syntax-entry ?, "' " st)
+ (modify-syntax-entry ?@ "' " st)
+ (modify-syntax-entry ?# "' 14b" st)
+ (modify-syntax-entry ?\\ "\\ " st)
+ st))
\f
-(defvar scheme-mode-abbrev-table nil "")
+(defvar scheme-mode-abbrev-table nil)
(define-abbrev-table 'scheme-mode-abbrev-table ())
+(defvar scheme-imenu-generic-expression
+ '((nil
+ "^(define\\(\\|-\\(generic\\(\\|-procedure\\)\\|method\\)\\)*\\s-+(?\\(\\sw+\\)" 4)
+ ("Types"
+ "^(define-class\\s-+(?\\(\\sw+\\)" 1)
+ ("Macros"
+ "^(\\(defmacro\\|define-macro\\|define-syntax\\)\\s-+(?\\(\\sw+\\)" 2))
+ "Imenu generic expression for Scheme mode. See `imenu-generic-expression'.")
+
(defun scheme-mode-variables ()
(set-syntax-table scheme-mode-syntax-table)
(setq local-abbrev-table scheme-mode-abbrev-table)
(make-local-variable 'paragraph-start)
- (setq paragraph-start (concat "^$\\|" page-delimiter))
+ (setq paragraph-start (concat "$\\|" page-delimiter))
(make-local-variable 'paragraph-separate)
(setq paragraph-separate paragraph-start)
(make-local-variable 'paragraph-ignore-fill-prefix)
(setq paragraph-ignore-fill-prefix t)
+ (make-local-variable 'fill-paragraph-function)
+ (setq fill-paragraph-function 'lisp-fill-paragraph)
+ ;; Adaptive fill mode gets in the way of auto-fill,
+ ;; and should make no difference for explicit fill
+ ;; because lisp-fill-paragraph should do the job.
+ (make-local-variable 'adaptive-fill-mode)
+ (setq adaptive-fill-mode nil)
+ (make-local-variable 'normal-auto-fill-function)
+ (setq normal-auto-fill-function 'lisp-mode-auto-fill)
(make-local-variable 'indent-line-function)
- (setq indent-line-function 'scheme-indent-line)
+ (setq indent-line-function 'lisp-indent-line)
+ (make-local-variable 'parse-sexp-ignore-comments)
+ (setq parse-sexp-ignore-comments t)
+ (make-local-variable 'outline-regexp)
+ (setq outline-regexp ";;; \\|(....")
(make-local-variable 'comment-start)
(setq comment-start ";")
+ (set (make-local-variable 'comment-add) 1)
(make-local-variable 'comment-start-skip)
- (setq comment-start-skip ";+[ \t]*")
+ ;; Look within the line for a ; following an even number of backslashes
+ ;; after either a non-backslash or the line beginning.
+ (setq comment-start-skip "\\(\\(^\\|[^\\\\\n]\\)\\(\\\\\\\\\\)*\\);+[ \t]*")
(make-local-variable 'comment-column)
(setq comment-column 40)
- (make-local-variable 'comment-indent-hook)
- (setq comment-indent-hook 'scheme-comment-indent)
- (setq mode-line-process '("" scheme-mode-line-process)))
+ (make-local-variable 'parse-sexp-ignore-comments)
+ (setq parse-sexp-ignore-comments t)
+ (make-local-variable 'lisp-indent-function)
+ (setq lisp-indent-function 'scheme-indent-function)
+ (setq mode-line-process '("" scheme-mode-line-process))
+ (set (make-local-variable 'imenu-case-fold-search) t)
+ (setq imenu-generic-expression scheme-imenu-generic-expression)
+ (set (make-local-variable 'imenu-syntax-alist)
+ '(("+-*/.<>=?!$%_&~^:" . "w")))
+ (set (make-local-variable 'font-lock-defaults)
+ '((scheme-font-lock-keywords
+ scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
+ nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
+ beginning-of-defun
+ (font-lock-mark-block-function . mark-defun)
+ (font-lock-syntactic-face-function
+ . scheme-font-lock-syntactic-face-function)
+ (parse-sexp-lookup-properties . t)
+ (font-lock-extra-managed-props syntax-table)))
+ (set (make-local-variable 'lisp-doc-string-elt-property)
+ 'scheme-doc-string-elt))
(defvar scheme-mode-line-process "")
+(defvar scheme-mode-map
+ (let ((smap (make-sparse-keymap))
+ (map (make-sparse-keymap "Scheme")))
+ (set-keymap-parent smap lisp-mode-shared-map)
+ (define-key smap [menu-bar scheme] (cons "Scheme" map))
+ (define-key map [run-scheme] '("Run Inferior Scheme" . run-scheme))
+ (define-key map [uncomment-region]
+ '("Uncomment Out Region" . (lambda (beg end)
+ (interactive "r")
+ (comment-region beg end '(4)))))
+ (define-key map [comment-region] '("Comment Out Region" . comment-region))
+ (define-key map [indent-region] '("Indent Region" . indent-region))
+ (define-key map [indent-line] '("Indent Line" . lisp-indent-line))
+ (put 'comment-region 'menu-enable 'mark-active)
+ (put 'uncomment-region 'menu-enable 'mark-active)
+ (put 'indent-region 'menu-enable 'mark-active)
+ smap)
+ "Keymap for Scheme mode.
+All commands in `lisp-mode-shared-map' are inherited by this map.")
+
+;; Used by cmuscheme
(defun scheme-mode-commands (map)
- (define-key map "\t" 'scheme-indent-line)
+ ;;(define-key map "\t" 'indent-for-tab-command) ; default
(define-key map "\177" 'backward-delete-char-untabify)
- (define-key map "\e\C-q" 'scheme-indent-sexp))
-
-(defvar scheme-mode-map nil)
-(if (not scheme-mode-map)
- (progn
- (setq scheme-mode-map (make-sparse-keymap))
- (scheme-mode-commands scheme-mode-map)))
+ (define-key map "\e\C-q" 'indent-sexp))
\f
;;;###autoload
(defun scheme-mode ()
"Major mode for editing Scheme code.
-Editing commands are similar to those of lisp-mode.
+Editing commands are similar to those of `lisp-mode'.
In addition, if an inferior Scheme process is running, some additional
commands will be defined, for evaluating expressions and controlling
the interpreter, and the state of the process will be displayed in the
modeline of all Scheme buffers. The names of commands that interact
-with the Scheme process start with \"xscheme-\". For more information
-see the documentation for xscheme-interaction-mode.
+with the Scheme process start with \"xscheme-\" if you use the MIT
+Scheme-specific `xscheme' package; for more information see the
+documentation for `xscheme-interaction-mode'. Use \\[run-scheme] to
+start an inferior Scheme using the more general `cmuscheme' package.
Commands:
Delete converts tabs to spaces as it moves back.
Blank lines separate paragraphs. Semicolons start comments.
\\{scheme-mode-map}
-Entry to this mode calls the value of scheme-mode-hook
+Entry to this mode calls the value of `scheme-mode-hook'
if that value is non-nil."
(interactive)
(kill-all-local-variables)
- (scheme-mode-initialize)
- (scheme-mode-variables)
- (run-hooks 'scheme-mode-hook))
-
-(defun scheme-mode-initialize ()
(use-local-map scheme-mode-map)
(setq major-mode 'scheme-mode)
- (setq mode-name "Scheme"))
+ (setq mode-name "Scheme")
+ (scheme-mode-variables)
+ (run-mode-hooks 'scheme-mode-hook))
-(defvar scheme-mit-dialect t
+(defgroup scheme nil
+ "Editing Scheme code."
+ :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
+ :group 'lisp)
+
+(defcustom scheme-mit-dialect t
"If non-nil, scheme mode is specialized for MIT Scheme.
-Set this to nil if you normally use another dialect.")
-\f
-(defun scheme-comment-indent (&optional pos)
- (save-excursion
- (if pos (goto-char pos))
- (cond ((looking-at ";;;") (current-column))
- ((looking-at ";;")
- (let ((tem (calculate-scheme-indent)))
- (if (listp tem) (car tem) tem)))
- (t
- (skip-chars-backward " \t")
- (max (if (bolp) 0 (1+ (current-column)))
- comment-column)))))
-
-(defvar scheme-indent-offset nil "")
-(defvar scheme-indent-function 'scheme-indent-function "")
-
-(defun scheme-indent-line (&optional whole-exp)
- "Indent current line as Scheme code.
-With argument, indent any additional lines of the same expression
-rigidly along with this one."
- (interactive "P")
- (let ((indent (calculate-scheme-indent)) shift-amt beg end
- (pos (- (point-max) (point))))
- (beginning-of-line)
- (setq beg (point))
- (skip-chars-forward " \t")
- (if (looking-at "[ \t]*;;;")
- ;; Don't alter indentation of a ;;; comment line.
- nil
- (if (listp indent) (setq indent (car indent)))
- (setq shift-amt (- indent (current-column)))
- (if (zerop shift-amt)
- nil
- (delete-region beg (point))
- (indent-to indent))
- ;; If initial point was within line's indentation,
- ;; position after the indentation. Else stay at same point in text.
- (if (> (- (point-max) pos) (point))
- (goto-char (- (point-max) pos)))
- ;; If desired, shift remaining lines of expression the same amount.
- (and whole-exp (not (zerop shift-amt))
- (save-excursion
- (goto-char beg)
- (forward-sexp 1)
- (setq end (point))
- (goto-char beg)
- (forward-line 1)
- (setq beg (point))
- (> end beg))
- (indent-code-rigidly beg end shift-amt)))))
-\f
-(defun calculate-scheme-indent (&optional parse-start)
- "Return appropriate indentation for current line as scheme code.
-In usual case returns an integer: the column to indent to.
-Can instead return a list, whose car is the column to indent to.
-This means that following lines at the same level of indentation
-should not necessarily be indented the same way.
-The second element of the list is the buffer position
-of the start of the containing expression."
- (save-excursion
- (beginning-of-line)
- (let ((indent-point (point)) state paren-depth desired-indent (retry t)
- last-sexp containing-sexp first-sexp-list-p)
- (if parse-start
- (goto-char parse-start)
- (beginning-of-defun))
- ;; Find outermost containing sexp
- (while (< (point) indent-point)
- (setq state (parse-partial-sexp (point) indent-point 0)))
- ;; Find innermost containing sexp
- (while (and retry (setq paren-depth (car state)) (> paren-depth 0))
- (setq retry nil)
- (setq last-sexp (nth 2 state))
- (setq containing-sexp (car (cdr state)))
- ;; Position following last unclosed open.
- (goto-char (1+ containing-sexp))
- ;; Is there a complete sexp since then?
- (if (and last-sexp (> last-sexp (point)))
- ;; Yes, but is there a containing sexp after that?
- (let ((peek (parse-partial-sexp last-sexp indent-point 0)))
- (if (setq retry (car (cdr peek))) (setq state peek))))
- (if (not retry)
- ;; Innermost containing sexp found
- (progn
- (goto-char (1+ containing-sexp))
- (if (not last-sexp)
- ;; indent-point immediately follows open paren.
- ;; Don't call hook.
- (setq desired-indent (current-column))
- ;; Move to first sexp after containing open paren
- (parse-partial-sexp (point) last-sexp 0 t)
- (setq first-sexp-list-p (looking-at "\\s("))
- (cond
- ((> (save-excursion (forward-line 1) (point))
- last-sexp)
- ;; Last sexp is on same line as containing sexp.
- ;; It's almost certainly a function call.
- (parse-partial-sexp (point) last-sexp 0 t)
- (if (/= (point) last-sexp)
- ;; Indent beneath first argument or, if only one sexp
- ;; on line, indent beneath that.
- (progn (forward-sexp 1)
- (parse-partial-sexp (point) last-sexp 0 t)))
- (backward-prefix-chars))
- (t
- ;; Indent beneath first sexp on same line as last-sexp.
- ;; Again, it's almost certainly a function call.
- (goto-char last-sexp)
- (beginning-of-line)
- (parse-partial-sexp (point) last-sexp 0 t)
- (backward-prefix-chars)))))))
- ;; If looking at a list, don't call hook.
- (if first-sexp-list-p
- (setq desired-indent (current-column)))
- ;; Point is at the point to indent under unless we are inside a string.
- ;; Call indentation hook except when overriden by scheme-indent-offset
- ;; or if the desired indentation has already been computed.
- (cond ((car (nthcdr 3 state))
- ;; Inside a string, don't change indentation.
- (goto-char indent-point)
- (skip-chars-forward " \t")
- (setq desired-indent (current-column)))
- ((and (integerp scheme-indent-offset) containing-sexp)
- ;; Indent by constant offset
- (goto-char containing-sexp)
- (setq desired-indent (+ scheme-indent-offset (current-column))))
- ((not (or desired-indent
- (and (boundp 'scheme-indent-function)
- scheme-indent-function
- (not retry)
- (setq desired-indent
- (funcall scheme-indent-function
- indent-point state)))))
- ;; Use default indentation if not computed yet
- (setq desired-indent (current-column))))
- desired-indent)))
+Set this to nil if you normally use another dialect."
+ :type 'boolean
+ :group 'scheme)
+
+(defcustom dsssl-sgml-declaration
+ "<!DOCTYPE style-sheet PUBLIC \"-//James Clark//DTD DSSSL Style Sheet//EN\">
+"
+ "*An SGML declaration for the DSSSL file.
+If it is defined as a string this will be inserted into an empty buffer
+which is in `dsssl-mode'. It is typically James Clark's style-sheet
+doctype, as required for Jade."
+ :type '(choice (string :tag "Specified string")
+ (const :tag "None" :value nil))
+ :group 'scheme)
+
+(defcustom scheme-mode-hook nil
+ "Normal hook run when entering `scheme-mode'.
+See `run-hooks'."
+ :type 'hook
+ :group 'scheme)
+
+(defcustom dsssl-mode-hook nil
+ "Normal hook run when entering `dsssl-mode'.
+See `run-hooks'."
+ :type 'hook
+ :group 'scheme)
+
+;; This is shared by cmuscheme and xscheme.
+(defcustom scheme-program-name "scheme"
+ "*Program invoked by the `run-scheme' command."
+ :type 'string
+ :group 'scheme)
+
+(defvar dsssl-imenu-generic-expression
+ ;; Perhaps this should also look for the style-sheet DTD tags. I'm
+ ;; not sure it's the best way to organize it; perhaps one type
+ ;; should be at the first level, though you don't see this anyhow if
+ ;; it gets split up.
+ '(("Defines"
+ "^(define\\s-+(?\\(\\sw+\\)" 1)
+ ("Modes"
+ "^\\s-*(mode\\s-+\\(\\(\\sw\\|\\s-\\)+\\)" 1)
+ ("Elements"
+ ;; (element foo ...) or (element (foo bar ...) ...)
+ ;; Fixme: Perhaps it should do `root'.
+ "^\\s-*(element\\s-+(?\\(\\(\\sw\\|\\s-\\)+\\))?" 1)
+ ("Declarations"
+ "^(declare\\(-\\sw+\\)+\\>\\s-+\\(\\sw+\\)" 2))
+ "Imenu generic expression for DSSSL mode. See `imenu-generic-expression'.")
+
+(defconst scheme-font-lock-keywords-1
+ (eval-when-compile
+ (list
+ ;;
+ ;; Declarations. Hannes Haug <hannes.haug@student.uni-tuebingen.de> says
+ ;; this works for SOS, STklos, SCOOPS, Meroon and Tiny CLOS.
+ (list (concat "(\\(define\\*?\\("
+ ;; Function names.
+ "\\(\\|-public\\|-method\\|-generic\\(-procedure\\)?\\)\\|"
+ ;; Macro names, as variable names. A bit dubious, this.
+ "\\(-syntax\\|-macro\\)\\|"
+ ;; Class names.
+ "-class"
+ ;; Guile modules.
+ "\\|-module"
+ "\\)\\)\\>"
+ ;; Any whitespace and declared object.
+ "[ \t]*(?"
+ "\\(\\sw+\\)?")
+ '(1 font-lock-keyword-face)
+ '(6 (cond ((match-beginning 3) font-lock-function-name-face)
+ ((match-beginning 5) font-lock-variable-name-face)
+ (t font-lock-type-face))
+ nil t))
+ ))
+ "Subdued expressions to highlight in Scheme modes.")
+
+(defconst scheme-font-lock-keywords-2
+ (append scheme-font-lock-keywords-1
+ (eval-when-compile
+ (list
+ ;;
+ ;; Control structures.
+ (cons
+ (concat
+ "(" (regexp-opt
+ '("begin" "call-with-current-continuation" "call/cc"
+ "call-with-input-file" "call-with-output-file" "case" "cond"
+ "do" "else" "for-each" "if" "lambda"
+ "let" "let*" "let-syntax" "letrec" "letrec-syntax"
+ ;; Hannes Haug <hannes.haug@student.uni-tuebingen.de> wants:
+ "and" "or" "delay" "force"
+ ;; Stefan Monnier <stefan.monnier@epfl.ch> says don't bother:
+ ;;"quasiquote" "quote" "unquote" "unquote-splicing"
+ "map" "syntax" "syntax-rules") t)
+ "\\>") 1)
+ ;;
+ ;; It wouldn't be Scheme w/o named-let.
+ '("(let\\s-+\\(\\sw+\\)"
+ (1 font-lock-function-name-face))
+ ;;
+ ;; David Fox <fox@graphics.cs.nyu.edu> for SOS/STklos class specifiers.
+ '("\\<<\\sw+>\\>" . font-lock-type-face)
+ ;;
+ ;; Scheme `:' and `#:' keywords as builtins.
+ '("\\<#?:\\sw+\\>" . font-lock-builtin-face)
+ )))
+ "Gaudy expressions to highlight in Scheme modes.")
+
+(defvar scheme-font-lock-keywords scheme-font-lock-keywords-1
+ "Default expressions to highlight in Scheme modes.")
+
+(defconst scheme-sexp-comment-syntax-table
+ (let ((st (make-syntax-table scheme-mode-syntax-table)))
+ (modify-syntax-entry ?\; "." st)
+ (modify-syntax-entry ?\n " " st)
+ (modify-syntax-entry ?# "'" st)
+ st))
+
+(put 'lambda 'scheme-doc-string-elt 2)
+;; Docstring's pos in a `define' depends on whether it's a var or fun def.
+(put 'define 'scheme-doc-string-elt
+ (lambda ()
+ ;; The function is called with point right after "define".
+ (forward-comment (point-max))
+ (if (eq (char-after) ?\() 2 0)))
+
+(defun scheme-font-lock-syntactic-face-function (state)
+ (when (and (null (nth 3 state))
+ (eq (char-after (nth 8 state)) ?#)
+ (eq (char-after (1+ (nth 8 state))) ?\;))
+ ;; It's a sexp-comment. Tell parse-partial-sexp where it ends.
+ (save-excursion
+ (let ((pos (point))
+ (end
+ (condition-case err
+ (let ((parse-sexp-lookup-properties nil))
+ (goto-char (+ 2 (nth 8 state)))
+ ;; FIXME: this doesn't handle the case where the sexp
+ ;; itself contains a #; comment.
+ (forward-sexp 1)
+ (point))
+ (scan-error (nth 2 err)))))
+ (when (< pos (- end 2))
+ (put-text-property pos (- end 2)
+ 'syntax-table scheme-sexp-comment-syntax-table))
+ (put-text-property (- end 1) end 'syntax-table '(12)))))
+ ;; Choose the face to use.
+ (lisp-font-lock-syntactic-face-function state))
+
+;;;###autoload
+(define-derived-mode dsssl-mode scheme-mode "DSSSL"
+ "Major mode for editing DSSSL code.
+Editing commands are similar to those of `lisp-mode'.
+
+Commands:
+Delete converts tabs to spaces as it moves back.
+Blank lines separate paragraphs. Semicolons start comments.
+\\{scheme-mode-map}
+Entering this mode runs the hooks `scheme-mode-hook' and then
+`dsssl-mode-hook' and inserts the value of `dsssl-sgml-declaration' if
+that variable's value is a string."
+ (make-local-variable 'page-delimiter)
+ (setq page-delimiter "^;;;" ; ^L not valid SGML char
+ major-mode 'dsssl-mode
+ mode-name "DSSSL")
+ ;; Insert a suitable SGML declaration into an empty buffer.
+ ;; FIXME: This should use `auto-insert-alist' instead.
+ (and (zerop (buffer-size))
+ (stringp dsssl-sgml-declaration)
+ (not buffer-read-only)
+ (insert dsssl-sgml-declaration))
+ (setq font-lock-defaults '(dsssl-font-lock-keywords
+ nil t (("+-*/.<>=?$%_&~^:" . "w"))
+ beginning-of-defun
+ (font-lock-mark-block-function . mark-defun)))
+ (set (make-local-variable 'imenu-case-fold-search) nil)
+ (setq imenu-generic-expression dsssl-imenu-generic-expression)
+ (set (make-local-variable 'imenu-syntax-alist)
+ '(("+-*/.<>=?$%_&~^:" . "w"))))
+
+;; Extra syntax for DSSSL. This isn't separated from Scheme, but
+;; shouldn't cause much trouble in scheme-mode.
+(put 'element 'scheme-indent-function 1)
+(put 'mode 'scheme-indent-function 1)
+(put 'with-mode 'scheme-indent-function 1)
+(put 'make 'scheme-indent-function 1)
+(put 'style 'scheme-indent-function 1)
+(put 'root 'scheme-indent-function 1)
+
+(defvar dsssl-font-lock-keywords
+ (eval-when-compile
+ (list
+ ;; Similar to Scheme
+ (list "(\\(define\\(-\\w+\\)?\\)\\>[ ]*\\\((?\\)\\(\\sw+\\)\\>"
+ '(1 font-lock-keyword-face)
+ '(4 font-lock-function-name-face))
+ (cons
+ (concat "(\\("
+ ;; (make-regexp '("case" "cond" "else" "if" "lambda"
+ ;; "let" "let*" "letrec" "and" "or" "map" "with-mode"))
+ "and\\|c\\(ase\\|ond\\)\\|else\\|if\\|"
+ "l\\(ambda\\|et\\(\\|*\\|rec\\)\\)\\|map\\|or\\|with-mode"
+ "\\)\\>")
+ 1)
+ ;; DSSSL syntax
+ '("(\\(element\\|mode\\|declare-\\w+\\)\\>[ ]*\\(\\sw+\\)"
+ (1 font-lock-keyword-face)
+ (2 font-lock-type-face))
+ '("(\\(element\\)\\>[ ]*(\\(\\S)+\\))"
+ (1 font-lock-keyword-face)
+ (2 font-lock-type-face))
+ '("\\<\\sw+:\\>" . font-lock-constant-face) ; trailing `:' c.f. scheme
+ ;; SGML markup (from sgml-mode) :
+ '("<\\([!?][-a-z0-9]+\\)" 1 font-lock-keyword-face)
+ '("<\\(/?[-a-z0-9]+\\)" 1 font-lock-function-name-face)))
+ "Default expressions to highlight in DSSSL mode.")
+
\f
+(defvar calculate-lisp-indent-last-sexp)
+
+;; Copied from lisp-indent-function, but with gets of
+;; scheme-indent-{function,hook}.
(defun scheme-indent-function (indent-point state)
(let ((normal-indent (current-column)))
- (save-excursion
- (goto-char (1+ (car (cdr state))))
- (re-search-forward "\\sw\\|\\s_")
- (if (/= (point) (car (cdr state)))
- (let ((function (buffer-substring (progn (forward-char -1) (point))
- (progn (forward-sexp 1) (point))))
- method)
- ;; Who cares about this, really?
- ;(if (not (string-match "\\\\\\||" function)))
- (setq function (downcase function))
- (setq method (get (intern-soft function) 'scheme-indent-function))
- (cond ((integerp method)
- (scheme-indent-specform method state indent-point))
- (method
- (funcall method state indent-point))
- ((and (> (length function) 3)
- (string-equal (substring function 0 3) "def"))
- (scheme-indent-defform state indent-point))))))))
-
-(defvar scheme-body-indent 2 "")
-\f
-(defun scheme-indent-specform (count state indent-point)
- (let ((containing-form-start (car (cdr state))) (i count)
- body-indent containing-form-column)
- ;; Move to the start of containing form, calculate indentation
- ;; to use for non-distinguished forms (> count), and move past the
- ;; function symbol. scheme-indent-function guarantees that there is at
- ;; least one word or symbol character following open paren of containing
- ;; form.
- (goto-char containing-form-start)
- (setq containing-form-column (current-column))
- (setq body-indent (+ scheme-body-indent containing-form-column))
- (forward-char 1)
- (forward-sexp 1)
- ;; Now find the start of the last form.
- (parse-partial-sexp (point) indent-point 1 t)
- (while (and (< (point) indent-point)
- (condition-case nil
- (progn
- (setq count (1- count))
- (forward-sexp 1)
- (parse-partial-sexp (point) indent-point 1 t))
- (error nil))))
- ;; Point is sitting on first character of last (or count) sexp.
- (cond ((> count 0)
- ;; A distinguished form. Use double scheme-body-indent.
- (list (+ containing-form-column (* 2 scheme-body-indent))
- containing-form-start))
- ;; A non-distinguished form. Use body-indent if there are no
- ;; distinguished forms and this is the first undistinguished
- ;; form, or if this is the first undistinguished form and
- ;; the preceding distinguished form has indentation at least
- ;; as great as body-indent.
- ((and (= count 0)
- (or (= i 0)
- (<= body-indent normal-indent)))
- body-indent)
- (t
- normal-indent))))
-
-(defun scheme-indent-defform (state indent-point)
- (goto-char (car (cdr state)))
- (forward-line 1)
- (if (> (point) (car (cdr (cdr state))))
- (progn
- (goto-char (car (cdr state)))
- (+ scheme-body-indent (current-column)))))
+ (goto-char (1+ (elt state 1)))
+ (parse-partial-sexp (point) calculate-lisp-indent-last-sexp 0 t)
+ (if (and (elt state 2)
+ (not (looking-at "\\sw\\|\\s_")))
+ ;; car of form doesn't seem to be a symbol
+ (progn
+ (if (not (> (save-excursion (forward-line 1) (point))
+ calculate-lisp-indent-last-sexp))
+ (progn (goto-char calculate-lisp-indent-last-sexp)
+ (beginning-of-line)
+ (parse-partial-sexp (point)
+ calculate-lisp-indent-last-sexp 0 t)))
+ ;; Indent under the list or under the first sexp on the same
+ ;; line as calculate-lisp-indent-last-sexp. Note that first
+ ;; thing on that line has to be complete sexp since we are
+ ;; inside the innermost containing sexp.
+ (backward-prefix-chars)
+ (current-column))
+ (let ((function (buffer-substring (point)
+ (progn (forward-sexp 1) (point))))
+ method)
+ (setq method (or (get (intern-soft function) 'scheme-indent-function)
+ (get (intern-soft function) 'scheme-indent-hook)))
+ (cond ((or (eq method 'defun)
+ (and (null method)
+ (> (length function) 3)
+ (string-match "\\`def" function)))
+ (lisp-indent-defform state indent-point))
+ ((integerp method)
+ (lisp-indent-specform method state
+ indent-point normal-indent))
+ (method
+ (funcall method state indent-point normal-indent)))))))
+
\f
;;; Let is different in Scheme
(not (string-equal (substring string 0 1) "(")))
(defun next-sexp-as-string ()
- ;; Assumes that protected by a save-excursion
+ ;; Assumes that it is protected by a save-excursion
(forward-sexp 1)
(let ((the-end (point)))
(backward-sexp 1)
;; (scheme-indent-specform 2 state indent-point)
;; (scheme-indent-specform 1 state indent-point)))
-(defun scheme-let-indent (state indent-point)
+(defun scheme-let-indent (state indent-point normal-indent)
(skip-chars-forward " \t")
- (if (looking-at "[a-zA-Z0-9+-*/?!@$%^&_:~]")
- (scheme-indent-specform 2 state indent-point)
- (scheme-indent-specform 1 state indent-point)))
+ (if (looking-at "[-a-zA-Z0-9+*/?!@$%^&_:~]")
+ (lisp-indent-specform 2 state indent-point normal-indent)
+ (lisp-indent-specform 1 state indent-point normal-indent)))
;; (put 'begin 'scheme-indent-function 0), say, causes begin to be indented
;; like defun if the first form is placed on the next line, otherwise
(put 'let 'scheme-indent-function 'scheme-let-indent)
(put 'let* 'scheme-indent-function 1)
(put 'letrec 'scheme-indent-function 1)
-(put 'sequence 'scheme-indent-function 0)
+(put 'sequence 'scheme-indent-function 0) ; SICP, not r4rs
+(put 'let-syntax 'scheme-indent-function 1)
+(put 'letrec-syntax 'scheme-indent-function 1)
+(put 'syntax-rules 'scheme-indent-function 1)
+(put 'syntax-case 'scheme-indent-function 2) ; not r5rs
(put 'call-with-input-file 'scheme-indent-function 1)
(put 'with-input-from-file 'scheme-indent-function 1)
(put 'call-with-output-file 'scheme-indent-function 1)
(put 'with-output-to-file 'scheme-indent-function 1)
(put 'with-output-to-port 'scheme-indent-function 1)
+(put 'call-with-values 'scheme-indent-function 1) ; r5rs?
+(put 'dynamic-wind 'scheme-indent-function 3) ; r5rs?
\f
;;;; MIT Scheme specific indentation.
(progn
(put 'fluid-let 'scheme-indent-function 1)
(put 'in-package 'scheme-indent-function 1)
- (put 'let-syntax 'scheme-indent-function 1)
(put 'local-declare 'scheme-indent-function 1)
(put 'macro 'scheme-indent-function 1)
(put 'make-environment 'scheme-indent-function 0)
(put 'unassigned\?-components 'scheme-indent-function 1)
(put 'unbound\?-components 'scheme-indent-function 1)
(put 'variable-components 'scheme-indent-function 1)))
-\f
-(defun scheme-indent-sexp ()
- "Indent each line of the list starting just after point."
- (interactive)
- (let ((indent-stack (list nil)) (next-depth 0) bol
- outer-loop-done inner-loop-done state this-indent)
- (save-excursion (forward-sexp 1))
- (save-excursion
- (setq outer-loop-done nil)
- (while (not outer-loop-done)
- (setq last-depth next-depth
- innerloop-done nil)
- (while (and (not innerloop-done)
- (not (setq outer-loop-done (eobp))))
- (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
- nil nil state))
- (setq next-depth (car state))
- (if (car (nthcdr 4 state))
- (progn (indent-for-comment)
- (end-of-line)
- (setcar (nthcdr 4 state) nil)))
- (if (car (nthcdr 3 state))
- (progn
- (forward-line 1)
- (setcar (nthcdr 5 state) nil))
- (setq innerloop-done t)))
- (if (setq outer-loop-done (<= next-depth 0))
- nil
- (while (> last-depth next-depth)
- (setq indent-stack (cdr indent-stack)
- last-depth (1- last-depth)))
- (while (< last-depth next-depth)
- (setq indent-stack (cons nil indent-stack)
- last-depth (1+ last-depth)))
- (forward-line 1)
- (setq bol (point))
- (skip-chars-forward " \t")
- (if (or (eobp) (looking-at "[;\n]"))
- nil
- (if (and (car indent-stack)
- (>= (car indent-stack) 0))
- (setq this-indent (car indent-stack))
- (let ((val (calculate-scheme-indent
- (if (car indent-stack) (- (car indent-stack))))))
- (if (integerp val)
- (setcar indent-stack
- (setq this-indent val))
- (setcar indent-stack (- (car (cdr val))))
- (setq this-indent (car val)))))
- (if (/= (current-column) this-indent)
- (progn (delete-region bol (point))
- (indent-to this-indent)))))))))
(provide 'scheme)
+
+;; arch-tag: a8f06bc1-ad11-42d2-9e36-ce651df37a90
+;;; scheme.el ends here