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- ;; Note: use
- ;; (autoload 'icon-mode "icon" nil t)
- ;; (setq auto-mode-alist (cons '("\\.icn$" . icon-mode) auto-mode-alist))
- ;; if not permanently installed in your emacs
-
- ;; Icon code editing commands for Emacs
- ;; from c-mode.el 13-Apr-88 Chris Smith; bugs to convex!csmith
- ;; Copyright (C) 1988 Free Software Foundation, Inc.
-
- ;; 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)
- ;; 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; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
- (defvar icon-mode-abbrev-table nil
- "Abbrev table in use in Icon-mode buffers.")
- (define-abbrev-table 'icon-mode-abbrev-table ())
-
- (defvar icon-mode-map ()
- "Keymap used in Icon mode.")
- (if icon-mode-map
- ()
- (setq icon-mode-map (make-sparse-keymap))
- (define-key icon-mode-map "{" 'electric-icon-brace)
- (define-key icon-mode-map "}" 'electric-icon-brace)
- (define-key icon-mode-map "\e\C-h" 'mark-icon-function)
- (define-key icon-mode-map "\e\C-a" 'beginning-of-icon-defun)
- (define-key icon-mode-map "\e\C-e" 'end-of-icon-defun)
- (define-key icon-mode-map "\e\C-q" 'indent-icon-exp)
- (define-key icon-mode-map "\177" 'backward-delete-char-untabify)
- (define-key icon-mode-map "\t" 'icon-indent-command))
-
- (defvar icon-mode-syntax-table nil
- "Syntax table in use in Icon-mode buffers.")
-
- (if icon-mode-syntax-table
- ()
- (setq icon-mode-syntax-table (make-syntax-table))
- (modify-syntax-entry ?\\ "\\" icon-mode-syntax-table)
- (modify-syntax-entry ?# "<" icon-mode-syntax-table)
- (modify-syntax-entry ?\n ">" icon-mode-syntax-table)
- (modify-syntax-entry ?$ "." icon-mode-syntax-table)
- (modify-syntax-entry ?/ "." icon-mode-syntax-table)
- (modify-syntax-entry ?* "." icon-mode-syntax-table)
- (modify-syntax-entry ?+ "." icon-mode-syntax-table)
- (modify-syntax-entry ?- "." icon-mode-syntax-table)
- (modify-syntax-entry ?= "." icon-mode-syntax-table)
- (modify-syntax-entry ?% "." icon-mode-syntax-table)
- (modify-syntax-entry ?< "." icon-mode-syntax-table)
- (modify-syntax-entry ?> "." icon-mode-syntax-table)
- (modify-syntax-entry ?& "." icon-mode-syntax-table)
- (modify-syntax-entry ?| "." icon-mode-syntax-table)
- (modify-syntax-entry ?\' "\"" icon-mode-syntax-table))
-
- (defconst icon-indent-level 4
- "*Indentation of Icon statements with respect to containing block.")
- (defconst icon-brace-imaginary-offset 0
- "*Imagined indentation of a Icon open brace that actually follows a statement.")
- (defconst icon-brace-offset 0
- "*Extra indentation for braces, compared with other text in same context.")
- (defconst icon-continued-statement-offset 4
- "*Extra indent for lines not starting new statements.")
- (defconst icon-continued-brace-offset 0
- "*Extra indent for substatements that start with open-braces.
- This is in addition to icon-continued-statement-offset.")
-
- (defconst icon-auto-newline nil
- "*Non-nil means automatically newline before and after braces,
- and after colons and semicolons, inserted in C code.")
-
- (defconst icon-tab-always-indent t
- "*Non-nil means TAB in Icon mode should always reindent the current line,
- regardless of where in the line point is when the TAB command is used.")
-
- (defun icon-mode ()
- "Major mode for editing Icon code.
- Expression and list commands understand all Icon brackets.
- Tab indents for Icon code.
- Paragraphs are separated by blank lines only.
- Delete converts tabs to spaces as it moves back.
- \\{icon-mode-map}
- Variables controlling indentation style:
- icon-tab-always-indent
- Non-nil means TAB in Icon mode should always reindent the current line,
- regardless of where in the line point is when the TAB command is used.
- icon-auto-newline
- Non-nil means automatically newline before and after braces
- inserted in Icon code.
- icon-indent-level
- Indentation of Icon statements within surrounding block.
- The surrounding block's indentation is the indentation
- of the line on which the open-brace appears.
- icon-continued-statement-offset
- Extra indentation given to a substatement, such as the
- then-clause of an if or body of a while.
- icon-continued-brace-offset
- Extra indentation given to a brace that starts a substatement.
- This is in addition to icon-continued-statement-offset.
- icon-brace-offset
- Extra indentation for line if it starts with an open brace.
- icon-brace-imaginary-offset
- An open brace following other text is treated as if it were
- this far to the right of the start of its line.
-
- Turning on Icon mode calls the value of the variable icon-mode-hook with no args,
- if that value is non-nil."
- (interactive)
- (kill-all-local-variables)
- (use-local-map icon-mode-map)
- (setq major-mode 'icon-mode)
- (setq mode-name "Icon")
- (setq local-abbrev-table icon-mode-abbrev-table)
- (set-syntax-table icon-mode-syntax-table)
- (make-local-variable 'paragraph-start)
- (setq paragraph-start (concat "^$\\|" page-delimiter))
- (make-local-variable 'paragraph-separate)
- (setq paragraph-separate paragraph-start)
- (make-local-variable 'indent-line-function)
- (setq indent-line-function 'icon-indent-line)
- (make-local-variable 'require-final-newline)
- (setq require-final-newline t)
- (make-local-variable 'comment-start)
- (setq comment-start "# ")
- (make-local-variable 'comment-end)
- (setq comment-end "")
- (make-local-variable 'comment-column)
- (setq comment-column 32)
- (make-local-variable 'comment-start-skip)
- (setq comment-start-skip "# *")
- (make-local-variable 'comment-indent-hook)
- (setq comment-indent-hook 'icon-comment-indent)
- (run-hooks 'icon-mode-hook))
-
- ;; This is used by indent-for-comment
- ;; to decide how much to indent a comment in Icon code
- ;; based on its context.
- (defun icon-comment-indent ()
- (if (looking-at "^#")
- 0 ;Existing comment at bol stays there.
- (save-excursion
- (skip-chars-backward " \t")
- (max (1+ (current-column)) ;Else indent at comment column
- comment-column)))) ; except leave at least one space.
-
- (defun electric-icon-brace (arg)
- "Insert character and correct line's indentation."
- (interactive "P")
- (let (insertpos)
- (if (and (not arg)
- (eolp)
- (or (save-excursion
- (skip-chars-backward " \t")
- (bolp))
- (if icon-auto-newline
- (progn (icon-indent-line) (newline) t)
- nil)))
- (progn
- (insert last-command-char)
- (icon-indent-line)
- (if icon-auto-newline
- (progn
- (newline)
- ;; (newline) may have done auto-fill
- (setq insertpos (- (point) 2))
- (icon-indent-line)))
- (save-excursion
- (if insertpos (goto-char (1+ insertpos)))
- (delete-char -1))))
- (if insertpos
- (save-excursion
- (goto-char insertpos)
- (self-insert-command (prefix-numeric-value arg)))
- (self-insert-command (prefix-numeric-value arg)))))
-
- (defun icon-indent-command (&optional whole-exp)
- (interactive "P")
- "Indent current line as Icon code, or in some cases insert a tab character.
- If icon-tab-always-indent is non-nil (the default), always indent current line.
- Otherwise, indent the current line only if point is at the left margin
- or in the line's indentation; otherwise insert a tab.
-
- A numeric argument, regardless of its value,
- means indent rigidly all the lines of the expression starting after point
- so that this line becomes properly indented.
- The relative indentation among the lines of the expression are preserved."
- (if whole-exp
- ;; If arg, always indent this line as Icon
- ;; and shift remaining lines of expression the same amount.
- (let ((shift-amt (icon-indent-line))
- beg end)
- (save-excursion
- (if icon-tab-always-indent
- (beginning-of-line))
- (setq beg (point))
- (forward-sexp 1)
- (setq end (point))
- (goto-char beg)
- (forward-line 1)
- (setq beg (point)))
- (if (> end beg)
- (indent-code-rigidly beg end shift-amt "#")))
- (if (and (not icon-tab-always-indent)
- (save-excursion
- (skip-chars-backward " \t")
- (not (bolp))))
- (insert-tab)
- (icon-indent-line))))
-
- (defun icon-indent-line ()
- "Indent current line as Icon code.
- Return the amount the indentation changed by."
- (let ((indent (calculate-icon-indent nil))
- beg shift-amt
- (case-fold-search nil)
- (pos (- (point-max) (point))))
- (beginning-of-line)
- (setq beg (point))
- (cond ((eq indent nil)
- (setq indent (current-indentation)))
- ((eq indent t)
- (setq indent (calculate-icon-indent-within-comment)))
- ((looking-at "[ \t]*#")
- (setq indent 0))
- (t
- (skip-chars-forward " \t")
- (if (listp indent) (setq indent (car indent)))
- (cond ((and (looking-at "else\\b")
- (not (looking-at "else\\s_")))
- (setq indent (save-excursion
- (icon-backward-to-start-of-if)
- (current-indentation))))
- ((or (= (following-char) ?})
- (looking-at "end\\b"))
- (setq indent (- indent icon-indent-level)))
- ((= (following-char) ?{)
- (setq indent (+ indent icon-brace-offset))))))
- (skip-chars-forward " \t")
- (setq shift-amt (- indent (current-column)))
- (if (zerop shift-amt)
- (if (> (- (point-max) pos) (point))
- (goto-char (- (point-max) pos)))
- (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))))
- shift-amt))
-
- (defun calculate-icon-indent (&optional parse-start)
- "Return appropriate indentation for current line as Icon code.
- In usual case returns an integer: the column to indent to.
- Returns nil if line starts inside a string, t if in a comment."
- (save-excursion
- (beginning-of-line)
- (let ((indent-point (point))
- (case-fold-search nil)
- state
- containing-sexp
- toplevel)
- (if parse-start
- (goto-char parse-start)
- (setq toplevel (beginning-of-icon-defun)))
- (while (< (point) indent-point)
- (setq parse-start (point))
- (setq state (parse-partial-sexp (point) indent-point 0))
- (setq containing-sexp (car (cdr state))))
- (cond ((or (nth 3 state) (nth 4 state))
- ;; return nil or t if should not change this line
- (nth 4 state))
- ((and containing-sexp
- (/= (char-after containing-sexp) ?{))
- ;; line is expression, not statement:
- ;; indent to just after the surrounding open.
- (goto-char (1+ containing-sexp))
- (current-column))
- (t
- ;; Statement level. Is it a continuation or a new statement?
- ;; Find previous non-comment character.
- (if toplevel
- (progn (icon-backward-to-noncomment (point-min))
- (if (icon-is-continuation-line)
- icon-continued-statement-offset 0))
- (if (null containing-sexp)
- (progn (beginning-of-icon-defun)
- (setq containing-sexp (point))))
- (goto-char indent-point)
- (icon-backward-to-noncomment containing-sexp)
- ;; Now we get the answer.
- (if (icon-is-continuation-line)
- ;; This line is continuation of preceding line's statement;
- ;; indent icon-continued-statement-offset more than the
- ;; first line of the statement.
- (progn
- (icon-backward-to-start-of-continued-exp containing-sexp)
- (+ icon-continued-statement-offset (current-column)
- (if (save-excursion (goto-char indent-point)
- (skip-chars-forward " \t")
- (eq (following-char) ?{))
- icon-continued-brace-offset 0)))
- ;; This line starts a new statement.
- ;; Position following last unclosed open.
- (goto-char containing-sexp)
- ;; Is line first statement after an open-brace?
- (or
- ;; If no, find that first statement and indent like it.
- (save-excursion
- (if (looking-at "procedure\\s ")
- (forward-sexp 3)
- (forward-char 1))
- (while (progn (skip-chars-forward " \t\n")
- (looking-at "#"))
- ;; Skip over comments following openbrace.
- (forward-line 1))
- ;; The first following code counts
- ;; if it is before the line we want to indent.
- (and (< (point) indent-point)
- (current-column)))
- ;; If no previous statement,
- ;; indent it relative to line brace is on.
- ;; For open brace in column zero, don't let statement
- ;; start there too. If icon-indent-level is zero,
- ;; use icon-brace-offset + icon-continued-statement-offset instead.
- ;; For open-braces not the first thing in a line,
- ;; add in icon-brace-imaginary-offset.
- (+ (if (and (bolp) (zerop icon-indent-level))
- (+ icon-brace-offset icon-continued-statement-offset)
- icon-indent-level)
- ;; Move back over whitespace before the openbrace.
- ;; If openbrace is not first nonwhite thing on the line,
- ;; add the icon-brace-imaginary-offset.
- (progn (skip-chars-backward " \t")
- (if (bolp) 0 icon-brace-imaginary-offset))
- ;; here we are
- (current-indentation))))))))))
-
- (defun icon-is-continuation-line ()
- (let* ((ch (preceding-char))
- (ch-syntax (char-syntax ch)))
- (if (eq ch-syntax ?w)
- (assoc (buffer-substring
- (progn (forward-word -1) (point))
- (progn (forward-word 1) (point)))
- '(("do") ("dynamic") ("else") ("initial") ("link")
- ("local") ("of") ("static") ("then")))
- (not (memq ch '(0 ?\; ?\} ?\{ ?\) ?\] ?\" ?\' ?\n))))))
-
- (defun icon-backward-to-noncomment (lim)
- (let (opoint stop)
- (while (not stop)
- (skip-chars-backward " \t\n\f" lim)
- (setq opoint (point))
- (beginning-of-line)
- (if (and (search-forward "#" opoint 'move)
- (< lim (point)))
- (forward-char -1)
- (setq stop t)))))
-
- (defun icon-backward-to-start-of-continued-exp (lim)
- (if (memq (preceding-char) '(?\) ?\]))
- (forward-sexp -1))
- (while (icon-is-continued-line)
- (end-of-line 0))
- (beginning-of-line)
- (if (<= (point) lim)
- (goto-char (1+ lim)))
- (skip-chars-forward " \t"))
-
- (defun icon-is-continued-line ()
- (save-excursion
- (end-of-line 0)
- (icon-is-continuation-line)))
-
- (defun icon-backward-to-start-of-if (&optional limit)
- "Move to the start of the last ``unbalanced'' if."
- (or limit (setq limit (save-excursion (beginning-of-icon-defun) (point))))
- (let ((if-level 1)
- (case-fold-search nil))
- (while (not (zerop if-level))
- (backward-sexp 1)
- (cond ((looking-at "else\\b")
- (setq if-level (1+ if-level)))
- ((looking-at "if\\b")
- (setq if-level (1- if-level)))
- ((< (point) limit)
- (setq if-level 0)
- (goto-char limit))))))
-
- (defun mark-icon-function ()
- "Put mark at end of Icon function, point at beginning."
- (interactive)
- (push-mark (point))
- (end-of-icon-defun)
- (push-mark (point))
- (beginning-of-line 0)
- (beginning-of-icon-defun))
-
- (defun beginning-of-icon-defun ()
- "Go to the start of the enclosing procedure; return t if at top level."
- (interactive)
- (if (re-search-backward "^procedure\\s \\|^end[ \t\n]" (point-min) 'move)
- (looking-at "e")
- t))
-
- (defun end-of-icon-defun ()
- (interactive)
- (if (not (bobp)) (forward-char -1))
- (re-search-forward "\\(\\s \\|^\\)end\\(\\s \\|$\\)" (point-max) 'move)
- (forward-word -1)
- (forward-line 1))
-
- (defun indent-icon-exp ()
- "Indent each line of the Icon grouping following point."
- (interactive)
- (let ((indent-stack (list nil))
- (contain-stack (list (point)))
- (case-fold-search nil)
- restart outer-loop-done inner-loop-done state ostate
- this-indent last-sexp
- at-else at-brace at-do
- (opoint (point))
- (next-depth 0))
- (save-excursion
- (forward-sexp 1))
- (save-excursion
- (setq outer-loop-done nil)
- (while (and (not (eobp)) (not outer-loop-done))
- (setq last-depth next-depth)
- ;; Compute how depth changes over this line
- ;; plus enough other lines to get to one that
- ;; does not end inside a comment or string.
- ;; Meanwhile, do appropriate indentation on comment lines.
- (setq innerloop-done nil)
- (while (and (not innerloop-done)
- (not (and (eobp) (setq outer-loop-done t))))
- (setq ostate state)
- (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
- nil nil state))
- (setq next-depth (car state))
- (if (and (car (cdr (cdr state)))
- (>= (car (cdr (cdr state))) 0))
- (setq last-sexp (car (cdr (cdr state)))))
- (if (or (nth 4 ostate))
- (icon-indent-line))
- (if (or (nth 3 state))
- (forward-line 1)
- (setq innerloop-done t)))
- (if (<= next-depth 0)
- (setq outer-loop-done t))
- (if outer-loop-done
- nil
- (if (/= last-depth next-depth)
- (setq last-sexp nil))
- (while (> last-depth next-depth)
- (setq indent-stack (cdr indent-stack)
- contain-stack (cdr contain-stack)
- last-depth (1- last-depth)))
- (while (< last-depth next-depth)
- (setq indent-stack (cons nil indent-stack)
- contain-stack (cons nil contain-stack)
- last-depth (1+ last-depth)))
- (if (null (car contain-stack))
- (setcar contain-stack (or (car (cdr state))
- (save-excursion (forward-sexp -1)
- (point)))))
- (forward-line 1)
- (skip-chars-forward " \t")
- (if (eolp)
- nil
- (if (and (car indent-stack)
- (>= (car indent-stack) 0))
- ;; Line is on an existing nesting level.
- ;; Lines inside parens are handled specially.
- (if (/= (char-after (car contain-stack)) ?{)
- (setq this-indent (car indent-stack))
- ;; Line is at statement level.
- ;; Is it a new statement? Is it an else?
- ;; Find last non-comment character before this line
- (save-excursion
- (setq at-else (looking-at "else\\W"))
- (setq at-brace (= (following-char) ?{))
- (icon-backward-to-noncomment opoint)
- (if (icon-is-continuation-line)
- ;; Preceding line did not end in comma or semi;
- ;; indent this line icon-continued-statement-offset
- ;; more than previous.
- (progn
- (icon-backward-to-start-of-continued-exp (car contain-stack))
- (setq this-indent
- (+ icon-continued-statement-offset (current-column)
- (if at-brace icon-continued-brace-offset 0))))
- ;; Preceding line ended in comma or semi;
- ;; use the standard indent for this level.
- (if at-else
- (progn (icon-backward-to-start-of-if opoint)
- (setq this-indent (current-indentation)))
- (setq this-indent (car indent-stack))))))
- ;; Just started a new nesting level.
- ;; Compute the standard indent for this level.
- (let ((val (calculate-icon-indent
- (if (car indent-stack)
- (- (car indent-stack))))))
- (setcar indent-stack
- (setq this-indent val))))
- ;; Adjust line indentation according to its contents
- (if (or (= (following-char) ?})
- (looking-at "end\\b"))
- (setq this-indent (- this-indent icon-indent-level)))
- (if (= (following-char) ?{)
- (setq this-indent (+ this-indent icon-brace-offset)))
- ;; Put chosen indentation into effect.
- (or (= (current-column) this-indent)
- (progn
- (delete-region (point) (progn (beginning-of-line) (point)))
- (indent-to this-indent)))
- ;; Indent any comment following the text.
- (or (looking-at comment-start-skip)
- (if (re-search-forward comment-start-skip (save-excursion (end-of-line) (point)) t)
- (progn (indent-for-comment) (beginning-of-line))))))))))
-