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1233 lines
43 KiB
EmacsLisp
1233 lines
43 KiB
EmacsLisp
;;; xscheme.el --- run MIT Scheme under Emacs
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;; Copyright (C) 1986, 1987, 1989, 1990, 2001 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: languages, lisp
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; A major mode for interacting with MIT Scheme.
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;;
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;; Requires MIT Scheme release 5 or later.
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;; Changes to Control-G handler require runtime version 13.85 or later.
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;;; Code:
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(require 'scheme)
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(defgroup xscheme nil
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"Major mode for editing Scheme and interacting with MIT's C-Scheme."
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:group 'lisp)
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(defcustom scheme-band-name nil
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"*Band loaded by the `run-scheme' command."
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:type '(choice (const nil) string)
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:group 'xscheme)
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(defcustom scheme-program-arguments nil
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"*Arguments passed to the Scheme program by the `run-scheme' command."
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:type '(choice (const nil) string)
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:group 'xscheme)
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(defcustom xscheme-allow-pipelined-evaluation t
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"If non-nil, an expression may be transmitted while another is evaluating.
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Otherwise, attempting to evaluate an expression before the previous expression
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has finished evaluating will signal an error."
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:type 'boolean
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:group 'xscheme)
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(defcustom xscheme-startup-message
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"This is the Scheme process buffer.
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Type \\[advertised-xscheme-send-previous-expression] to evaluate the expression before point.
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Type \\[xscheme-send-control-g-interrupt] to abort evaluation.
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Type \\[describe-mode] for more information.
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"
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"String to insert into Scheme process buffer first time it is started.
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Is processed with `substitute-command-keys' first."
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:type 'string
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:group 'xscheme)
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(defcustom xscheme-signal-death-message nil
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"If non-nil, causes a message to be generated when the Scheme process dies."
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:type 'boolean
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:group 'xscheme)
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(defcustom xscheme-start-hook nil
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"If non-nil, a procedure to call when the Scheme process is started.
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When called, the current buffer will be the Scheme process-buffer."
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:type 'hook
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:group 'xscheme
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:version "20.3")
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(defun xscheme-evaluation-commands (keymap)
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(define-key keymap "\e\C-x" 'xscheme-send-definition)
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(define-key keymap "\C-x\C-e" 'advertised-xscheme-send-previous-expression)
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(define-key keymap "\eo" 'xscheme-send-buffer)
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(define-key keymap "\ez" 'xscheme-send-definition)
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(define-key keymap "\e\C-m" 'xscheme-send-previous-expression)
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(define-key keymap "\e\C-z" 'xscheme-send-region))
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(defun xscheme-interrupt-commands (keymap)
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(define-key keymap "\C-c\C-s" 'xscheme-select-process-buffer)
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(define-key keymap "\C-c\C-b" 'xscheme-send-breakpoint-interrupt)
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(define-key keymap "\C-c\C-c" 'xscheme-send-control-g-interrupt)
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(define-key keymap "\C-c\C-u" 'xscheme-send-control-u-interrupt)
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(define-key keymap "\C-c\C-x" 'xscheme-send-control-x-interrupt))
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(xscheme-evaluation-commands scheme-mode-map)
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(xscheme-interrupt-commands scheme-mode-map)
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(defun run-scheme (command-line)
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"Run MIT Scheme in an inferior process.
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Output goes to the buffer `*scheme*'.
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With argument, asks for a command line."
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(interactive (list (xscheme-read-command-line current-prefix-arg)))
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(xscheme-start command-line xscheme-process-name xscheme-buffer-name))
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(defun xscheme-start (command-line process-name buffer-name)
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(setq-default xscheme-process-command-line command-line)
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(switch-to-buffer
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(xscheme-start-process command-line process-name buffer-name))
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(make-local-variable 'xscheme-process-command-line)
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(setq xscheme-process-command-line command-line))
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(defun xscheme-read-command-line (arg)
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(let ((default
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(or xscheme-process-command-line
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(xscheme-default-command-line))))
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(if arg
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(read-string "Run Scheme: " default)
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default)))
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(defun xscheme-default-command-line ()
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(concat scheme-program-name " -emacs"
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(if scheme-program-arguments
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(concat " " scheme-program-arguments)
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"")
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(if scheme-band-name
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(concat " -band " scheme-band-name)
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"")))
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(defun reset-scheme ()
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"Reset the Scheme process."
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(interactive)
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(let ((process (get-process xscheme-process-name)))
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(cond ((or (not process)
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(not (eq (process-status process) 'run))
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(yes-or-no-p
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"The Scheme process is running, are you SURE you want to reset it? "))
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(message "Resetting Scheme process...")
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(if process
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(progn
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(kill-process process t)
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(delete-process process)))
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(xscheme-start-process xscheme-process-command-line
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xscheme-process-name
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xscheme-buffer-name)
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(message "Resetting Scheme process...done")))))
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;;;; Multiple Scheme buffer management commands
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(defun start-scheme (buffer-name &optional globally)
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"Choose a scheme interaction buffer, or create a new one."
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;; (interactive "BScheme interaction buffer: \nP")
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(interactive
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(list (read-buffer "Scheme interaction buffer: "
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xscheme-buffer-name
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nil)
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current-prefix-arg))
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(let ((buffer (get-buffer-create buffer-name)))
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(let ((process (get-buffer-process buffer)))
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(if process
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(switch-to-buffer buffer)
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(if (or (not (buffer-file-name buffer))
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(yes-or-no-p (concat "Buffer "
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(buffer-name buffer)
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" contains file "
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(buffer-file-name buffer)
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"; start scheme in it? ")))
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(progn
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(xscheme-start (xscheme-read-command-line t)
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buffer-name
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buffer-name)
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(if globally
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(global-set-scheme-interaction-buffer buffer-name)))
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(message "start-scheme aborted"))))))
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(fset 'select-scheme 'start-scheme)
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(defun global-set-scheme-interaction-buffer (buffer-name)
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"Set the default scheme interaction buffer."
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(interactive
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(list (read-buffer "Scheme interaction buffer: "
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xscheme-buffer-name
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t)))
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(let ((process-name (verify-xscheme-buffer buffer-name nil)))
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(setq-default xscheme-buffer-name buffer-name)
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(setq-default xscheme-process-name process-name)
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(setq-default xscheme-runlight-string
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(save-excursion (set-buffer buffer-name)
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xscheme-runlight-string))
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(setq-default xscheme-runlight
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(if (eq (process-status process-name) 'run)
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default-xscheme-runlight
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""))))
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(defun local-set-scheme-interaction-buffer (buffer-name)
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"Set the scheme interaction buffer for the current buffer."
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(interactive
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(list (read-buffer "Scheme interaction buffer: "
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xscheme-buffer-name
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t)))
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(let ((process-name (verify-xscheme-buffer buffer-name t)))
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(make-local-variable 'xscheme-buffer-name)
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(setq xscheme-buffer-name buffer-name)
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(make-local-variable 'xscheme-process-name)
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(setq xscheme-process-name process-name)
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(make-local-variable 'xscheme-runlight)
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(setq xscheme-runlight (save-excursion (set-buffer buffer-name)
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xscheme-runlight))))
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(defun local-clear-scheme-interaction-buffer ()
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"Make the current buffer use the default scheme interaction buffer."
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(interactive)
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(if (xscheme-process-buffer-current-p)
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(error "Cannot change the interaction buffer of an interaction buffer"))
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(kill-local-variable 'xscheme-buffer-name)
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(kill-local-variable 'xscheme-process-name)
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(kill-local-variable 'xscheme-runlight))
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(defun verify-xscheme-buffer (buffer-name localp)
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(if (and localp (xscheme-process-buffer-current-p))
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(error "Cannot change the interaction buffer of an interaction buffer"))
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(let* ((buffer (get-buffer buffer-name))
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(process (and buffer (get-buffer-process buffer))))
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(cond ((not buffer)
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(error "Buffer does not exist" buffer-name))
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((not process)
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(error "Buffer is not a scheme interaction buffer" buffer-name))
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(t
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(save-excursion
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(set-buffer buffer)
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(if (not (xscheme-process-buffer-current-p))
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(error "Buffer is not a scheme interaction buffer"
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buffer-name)))
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(process-name process)))))
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;;;; Interaction Mode
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(defun scheme-interaction-mode (&optional preserve)
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"Major mode for interacting with an inferior MIT Scheme process.
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Like scheme-mode except that:
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\\[advertised-xscheme-send-previous-expression] sends the expression before point to the Scheme process as input
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\\[xscheme-yank-pop] yanks an expression previously sent to Scheme
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\\[xscheme-yank-push] yanks an expression more recently sent to Scheme
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All output from the Scheme process is written in the Scheme process
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buffer, which is initially named \"*scheme*\". The result of
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evaluating a Scheme expression is also printed in the process buffer,
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preceded by the string \";Value: \" to highlight it. If the process
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buffer is not visible at that time, the value will also be displayed
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in the minibuffer. If an error occurs, the process buffer will
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automatically pop up to show you the error message.
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While the Scheme process is running, the modelines of all buffers in
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scheme-mode are modified to show the state of the process. The
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possible states and their meanings are:
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input waiting for input
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run evaluating
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gc garbage collecting
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The process buffer's modeline contains additional information where
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the buffer's name is normally displayed: the command interpreter level
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and type.
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Scheme maintains a stack of command interpreters. Every time an error
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or breakpoint occurs, the current command interpreter is pushed on the
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command interpreter stack, and a new command interpreter is started.
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One example of why this is done is so that an error that occurs while
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you are debugging another error will not destroy the state of the
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initial error, allowing you to return to it after the second error has
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been fixed.
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The command interpreter level indicates how many interpreters are in
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the command interpreter stack. It is initially set to one, and it is
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incremented every time that stack is pushed, and decremented every
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time it is popped. The following commands are useful for manipulating
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the command interpreter stack:
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\\[xscheme-send-breakpoint-interrupt] pushes the stack once
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\\[xscheme-send-control-u-interrupt] pops the stack once
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\\[xscheme-send-control-g-interrupt] pops everything off
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\\[xscheme-send-control-x-interrupt] aborts evaluation, doesn't affect stack
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Some possible command interpreter types and their meanings are:
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\[Evaluator] read-eval-print loop for evaluating expressions
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\[Debugger] single character commands for debugging errors
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\[Where] single character commands for examining environments
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Starting with release 6.2 of Scheme, the latter two types of command
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interpreters will change the major mode of the Scheme process buffer
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to scheme-debugger-mode , in which the evaluation commands are
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disabled, and the keys which normally self insert instead send
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themselves to the Scheme process. The command character ? will list
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the available commands.
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For older releases of Scheme, the major mode will be be
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scheme-interaction-mode , and the command characters must be sent as
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if they were expressions.
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Commands:
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Delete converts tabs to spaces as it moves back.
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Blank lines separate paragraphs. Semicolons start comments.
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\\{scheme-interaction-mode-map}
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Entry to this mode calls the value of scheme-interaction-mode-hook
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with no args, if that value is non-nil.
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Likewise with the value of scheme-mode-hook.
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scheme-interaction-mode-hook is called after scheme-mode-hook."
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(interactive "P")
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(if (not preserve)
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(let ((previous-mode major-mode))
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(kill-all-local-variables)
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(make-local-variable 'xscheme-previous-mode)
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(make-local-variable 'xscheme-buffer-name)
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(make-local-variable 'xscheme-process-name)
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(make-local-variable 'xscheme-previous-process-state)
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(make-local-variable 'xscheme-runlight-string)
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(make-local-variable 'xscheme-runlight)
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(make-local-variable 'xscheme-last-input-end)
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(setq xscheme-previous-mode previous-mode)
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(let ((buffer (current-buffer)))
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(setq xscheme-buffer-name (buffer-name buffer))
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(setq xscheme-last-input-end (make-marker))
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(let ((process (get-buffer-process buffer)))
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(if process
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(progn
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(setq xscheme-process-name (process-name process))
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(setq xscheme-previous-process-state
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(cons (process-filter process)
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(process-sentinel process)))
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(xscheme-process-filter-initialize t)
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(xscheme-modeline-initialize xscheme-buffer-name)
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(set-process-sentinel process 'xscheme-process-sentinel)
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(set-process-filter process 'xscheme-process-filter))
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(setq xscheme-previous-process-state (cons nil nil)))))))
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(scheme-interaction-mode-initialize)
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(scheme-mode-variables)
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(run-hooks 'scheme-mode-hook 'scheme-interaction-mode-hook))
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(defun exit-scheme-interaction-mode ()
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"Take buffer out of scheme interaction mode"
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(interactive)
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(if (not (eq major-mode 'scheme-interaction-mode))
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(error "Buffer not in scheme interaction mode"))
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(let ((previous-state xscheme-previous-process-state))
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(funcall xscheme-previous-mode)
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(let ((process (get-buffer-process (current-buffer))))
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(if process
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(progn
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(if (eq (process-filter process) 'xscheme-process-filter)
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(set-process-filter process (car previous-state)))
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(if (eq (process-sentinel process) 'xscheme-process-sentinel)
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(set-process-sentinel process (cdr previous-state))))))))
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(defun scheme-interaction-mode-initialize ()
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(use-local-map scheme-interaction-mode-map)
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(setq major-mode 'scheme-interaction-mode)
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(setq mode-name "Scheme Interaction"))
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(defun scheme-interaction-mode-commands (keymap)
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(let ((entries scheme-interaction-mode-commands-alist))
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(while entries
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(define-key keymap
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(car (car entries))
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(car (cdr (car entries))))
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(setq entries (cdr entries)))))
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(defvar scheme-interaction-mode-commands-alist nil)
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(setq scheme-interaction-mode-commands-alist
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(append scheme-interaction-mode-commands-alist
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'(("\C-c\C-m" xscheme-send-current-line)
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("\C-c\C-o" xscheme-delete-output)
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("\C-c\C-p" xscheme-send-proceed)
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("\C-c\C-y" xscheme-yank)
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("\ep" xscheme-yank-pop)
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("\en" xscheme-yank-push))))
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(defvar scheme-interaction-mode-map nil)
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(if (not scheme-interaction-mode-map)
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(progn
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(setq scheme-interaction-mode-map (make-keymap))
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(scheme-mode-commands scheme-interaction-mode-map)
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(xscheme-interrupt-commands scheme-interaction-mode-map)
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(xscheme-evaluation-commands scheme-interaction-mode-map)
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(scheme-interaction-mode-commands scheme-interaction-mode-map)))
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(defun xscheme-enter-interaction-mode ()
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(save-excursion
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(set-buffer (xscheme-process-buffer))
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(if (not (eq major-mode 'scheme-interaction-mode))
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(if (eq major-mode 'scheme-debugger-mode)
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(scheme-interaction-mode-initialize)
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(scheme-interaction-mode t)))))
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(fset 'advertised-xscheme-send-previous-expression
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'xscheme-send-previous-expression)
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;;;; Debugger Mode
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(defun scheme-debugger-mode ()
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"Major mode for executing the Scheme debugger.
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Like scheme-mode except that the evaluation commands
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are disabled, and characters that would normally be self inserting are
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sent to the Scheme process instead. Typing ? will show you which
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characters perform useful functions.
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Commands:
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\\{scheme-debugger-mode-map}"
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(error "Illegal entry to scheme-debugger-mode"))
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(defun scheme-debugger-mode-initialize ()
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(use-local-map scheme-debugger-mode-map)
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(setq major-mode 'scheme-debugger-mode)
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(setq mode-name "Scheme Debugger"))
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(defun scheme-debugger-mode-commands (keymap)
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(let ((char ? ))
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(while (< char 127)
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(define-key keymap (char-to-string char) 'scheme-debugger-self-insert)
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(setq char (1+ char)))))
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(defvar scheme-debugger-mode-map nil)
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(if (not scheme-debugger-mode-map)
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(progn
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(setq scheme-debugger-mode-map (make-keymap))
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(scheme-mode-commands scheme-debugger-mode-map)
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(xscheme-interrupt-commands scheme-debugger-mode-map)
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(scheme-debugger-mode-commands scheme-debugger-mode-map)))
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(defun scheme-debugger-self-insert ()
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"Transmit this character to the Scheme process."
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(interactive)
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(xscheme-send-char last-command-char))
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(defun xscheme-enter-debugger-mode (prompt-string)
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(save-excursion
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(set-buffer (xscheme-process-buffer))
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(if (not (eq major-mode 'scheme-debugger-mode))
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(progn
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(if (not (eq major-mode 'scheme-interaction-mode))
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(scheme-interaction-mode t))
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(scheme-debugger-mode-initialize)))))
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(defun xscheme-debugger-mode-p ()
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(let ((buffer (xscheme-process-buffer)))
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(and buffer
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(save-excursion
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(set-buffer buffer)
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(eq major-mode 'scheme-debugger-mode)))))
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;;;; Evaluation Commands
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(defun xscheme-send-string (&rest strings)
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"Send the string arguments to the Scheme process.
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The strings are concatenated and terminated by a newline."
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(cond ((not (xscheme-process-running-p))
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(if (yes-or-no-p "The Scheme process has died. Reset it? ")
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(progn
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(reset-scheme)
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(xscheme-wait-for-process)
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(xscheme-send-string-1 strings))))
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((xscheme-debugger-mode-p) (error "No sends allowed in debugger mode"))
|
||
((and (not xscheme-allow-pipelined-evaluation)
|
||
xscheme-running-p)
|
||
(error "No sends allowed while Scheme running"))
|
||
(t (xscheme-send-string-1 strings))))
|
||
|
||
(defun xscheme-send-string-1 (strings)
|
||
(let ((string (apply 'concat strings)))
|
||
(xscheme-send-string-2 string)
|
||
(if (eq major-mode 'scheme-interaction-mode)
|
||
(xscheme-insert-expression string))))
|
||
|
||
(defun xscheme-send-string-2 (string)
|
||
(let ((process (get-process xscheme-process-name)))
|
||
(process-send-string process (concat string "\n"))
|
||
(if (xscheme-process-buffer-current-p)
|
||
(set-marker (process-mark process) (point)))))
|
||
|
||
(defun xscheme-select-process-buffer ()
|
||
"Select the Scheme process buffer and move to its output point."
|
||
(interactive)
|
||
(let ((process
|
||
(or (get-process xscheme-process-name)
|
||
(error "No scheme process"))))
|
||
(let ((buffer (or (process-buffer process) (error "No process buffer"))))
|
||
(let ((window (get-buffer-window buffer)))
|
||
(if window
|
||
(select-window window)
|
||
(switch-to-buffer buffer))
|
||
(goto-char (process-mark process))))))
|
||
|
||
;;;; Scheme expressions ring
|
||
|
||
(defun xscheme-insert-expression (string)
|
||
(setq xscheme-expressions-ring (cons string xscheme-expressions-ring))
|
||
(if (> (length xscheme-expressions-ring) xscheme-expressions-ring-max)
|
||
(setcdr (nthcdr (1- xscheme-expressions-ring-max)
|
||
xscheme-expressions-ring)
|
||
nil))
|
||
(setq xscheme-expressions-ring-yank-pointer xscheme-expressions-ring))
|
||
|
||
(defun xscheme-rotate-yank-pointer (arg)
|
||
"Rotate the yanking point in the kill ring."
|
||
(interactive "p")
|
||
(let ((length (length xscheme-expressions-ring)))
|
||
(if (zerop length)
|
||
(error "Scheme expression ring is empty")
|
||
(setq xscheme-expressions-ring-yank-pointer
|
||
(let ((index
|
||
(% (+ arg
|
||
(- length
|
||
(length xscheme-expressions-ring-yank-pointer)))
|
||
length)))
|
||
(nthcdr (if (< index 0)
|
||
(+ index length)
|
||
index)
|
||
xscheme-expressions-ring))))))
|
||
|
||
(defun xscheme-yank (&optional arg)
|
||
"Insert the most recent expression at point.
|
||
With just C-U as argument, same but put point in front (and mark at end).
|
||
With argument n, reinsert the nth most recently sent expression.
|
||
See also the commands \\[xscheme-yank-pop] and \\[xscheme-yank-push]."
|
||
(interactive "*P")
|
||
(xscheme-rotate-yank-pointer (if (listp arg) 0
|
||
(if (eq arg '-) -1
|
||
(1- arg))))
|
||
(push-mark (point))
|
||
(insert (car xscheme-expressions-ring-yank-pointer))
|
||
(if (consp arg)
|
||
(exchange-point-and-mark)))
|
||
|
||
;; Old name, to avoid errors in users' init files.
|
||
(fset 'xscheme-yank-previous-send
|
||
'xscheme-yank)
|
||
|
||
(defun xscheme-yank-pop (arg)
|
||
"Insert or replace a just-yanked expression with an older expression.
|
||
If the previous command was not a yank, it yanks.
|
||
Otherwise, the region contains a stretch of reinserted
|
||
expression. yank-pop deletes that text and inserts in its
|
||
place a different expression.
|
||
|
||
With no argument, the next older expression is inserted.
|
||
With argument n, the n'th older expression is inserted.
|
||
If n is negative, this is a more recent expression.
|
||
|
||
The sequence of expressions wraps around, so that after the oldest one
|
||
comes the newest one."
|
||
(interactive "*p")
|
||
(setq this-command 'xscheme-yank)
|
||
(if (not (eq last-command 'xscheme-yank))
|
||
(progn
|
||
(xscheme-yank)
|
||
(setq arg (- arg 1))))
|
||
(if (not (= arg 0))
|
||
(let ((before (< (point) (mark))))
|
||
(delete-region (point) (mark))
|
||
(xscheme-rotate-yank-pointer arg)
|
||
(set-mark (point))
|
||
(insert (car xscheme-expressions-ring-yank-pointer))
|
||
(if before (exchange-point-and-mark)))))
|
||
|
||
(defun xscheme-yank-push (arg)
|
||
"Insert or replace a just-yanked expression with a more recent expression.
|
||
If the previous command was not a yank, it yanks.
|
||
Otherwise, the region contains a stretch of reinserted
|
||
expression. yank-pop deletes that text and inserts in its
|
||
place a different expression.
|
||
|
||
With no argument, the next more recent expression is inserted.
|
||
With argument n, the n'th more recent expression is inserted.
|
||
If n is negative, a less recent expression is used.
|
||
|
||
The sequence of expressions wraps around, so that after the oldest one
|
||
comes the newest one."
|
||
(interactive "*p")
|
||
(xscheme-yank-pop (- 0 arg)))
|
||
|
||
(defun xscheme-send-region (start end)
|
||
"Send the current region to the Scheme process.
|
||
The region is sent terminated by a newline."
|
||
(interactive "r")
|
||
(if (xscheme-process-buffer-current-p)
|
||
(progn
|
||
(goto-char end)
|
||
(if (not (bolp))
|
||
(insert-before-markers ?\n))
|
||
(set-marker (process-mark (get-process xscheme-process-name))
|
||
(point))
|
||
(set-marker xscheme-last-input-end (point))))
|
||
(xscheme-send-string (buffer-substring start end)))
|
||
|
||
(defun xscheme-send-definition ()
|
||
"Send the current definition to the Scheme process.
|
||
If the current line begins with a non-whitespace character,
|
||
parse an expression from the beginning of the line and send that instead."
|
||
(interactive)
|
||
(let ((start nil) (end nil))
|
||
(save-excursion
|
||
(end-of-defun)
|
||
(setq end (point))
|
||
(if (re-search-backward "^\\s(" nil t)
|
||
(setq start (point))
|
||
(error "Can't find definition")))
|
||
(xscheme-send-region start end)))
|
||
|
||
(defun xscheme-send-next-expression ()
|
||
"Send the expression to the right of `point' to the Scheme process."
|
||
(interactive)
|
||
(let ((start (point)))
|
||
(xscheme-send-region start (save-excursion (forward-sexp) (point)))))
|
||
|
||
(defun xscheme-send-previous-expression ()
|
||
"Send the expression to the left of `point' to the Scheme process."
|
||
(interactive)
|
||
(let ((end (point)))
|
||
(xscheme-send-region (save-excursion (backward-sexp) (point)) end)))
|
||
|
||
(defun xscheme-send-current-line ()
|
||
"Send the current line to the Scheme process.
|
||
Useful for working with debugging Scheme under adb."
|
||
(interactive)
|
||
(let ((line
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(let ((start (point)))
|
||
(end-of-line)
|
||
(buffer-substring start (point))))))
|
||
(end-of-line)
|
||
(insert ?\n)
|
||
(xscheme-send-string-2 line)))
|
||
|
||
(defun xscheme-send-buffer ()
|
||
"Send the current buffer to the Scheme process."
|
||
(interactive)
|
||
(if (xscheme-process-buffer-current-p)
|
||
(error "Not allowed to send this buffer's contents to Scheme"))
|
||
(xscheme-send-region (point-min) (point-max)))
|
||
|
||
(defun xscheme-send-char (char)
|
||
"Prompt for a character and send it to the Scheme process."
|
||
(interactive "cCharacter to send: ")
|
||
(process-send-string xscheme-process-name (char-to-string char)))
|
||
|
||
(defun xscheme-delete-output ()
|
||
"Delete all output from interpreter since last input."
|
||
(interactive)
|
||
(let ((proc (get-buffer-process (current-buffer))))
|
||
(save-excursion
|
||
(goto-char (process-mark proc))
|
||
(re-search-backward
|
||
"^;\\(Unspecified return value$\\|Value\\( [0-9]+\\)?: \\|\\(Abort\\|Up\\|Quit\\)!$\\)"
|
||
xscheme-last-input-end
|
||
t)
|
||
(forward-line 0)
|
||
(if (< (marker-position xscheme-last-input-end) (point))
|
||
(progn
|
||
(delete-region xscheme-last-input-end (point))
|
||
(insert-before-markers "*** output flushed ***\n"))))))
|
||
|
||
;;;; Interrupts
|
||
|
||
(defun xscheme-send-breakpoint-interrupt ()
|
||
"Cause the Scheme process to enter a breakpoint."
|
||
(interactive)
|
||
(xscheme-send-interrupt ?b nil))
|
||
|
||
(defun xscheme-send-proceed ()
|
||
"Cause the Scheme process to proceed from a breakpoint."
|
||
(interactive)
|
||
(process-send-string xscheme-process-name "(proceed)\n"))
|
||
|
||
(defun xscheme-send-control-g-interrupt ()
|
||
"Cause the Scheme processor to halt and flush input.
|
||
Control returns to the top level rep loop."
|
||
(interactive)
|
||
(let ((inhibit-quit t))
|
||
(cond ((not xscheme-control-g-synchronization-p)
|
||
(interrupt-process xscheme-process-name))
|
||
((save-excursion
|
||
(set-buffer xscheme-buffer-name)
|
||
xscheme-control-g-disabled-p)
|
||
(message "Relax..."))
|
||
(t
|
||
(save-excursion
|
||
(set-buffer xscheme-buffer-name)
|
||
(setq xscheme-control-g-disabled-p t))
|
||
(message xscheme-control-g-message-string)
|
||
(interrupt-process xscheme-process-name)
|
||
(sleep-for 0.1)
|
||
(xscheme-send-char 0)))))
|
||
|
||
(defconst xscheme-control-g-message-string
|
||
"Sending C-G interrupt to Scheme...")
|
||
|
||
(defun xscheme-send-control-u-interrupt ()
|
||
"Cause the Scheme process to halt, returning to previous rep loop."
|
||
(interactive)
|
||
(xscheme-send-interrupt ?u t))
|
||
|
||
(defun xscheme-send-control-x-interrupt ()
|
||
"Cause the Scheme process to halt, returning to current rep loop."
|
||
(interactive)
|
||
(xscheme-send-interrupt ?x t))
|
||
|
||
;;; This doesn't really work right -- Scheme just gobbles the first
|
||
;;; character in the input. There is no way for us to guarantee that
|
||
;;; the argument to this procedure is the first char unless we put
|
||
;;; some kind of marker in the input stream.
|
||
|
||
(defun xscheme-send-interrupt (char mark-p)
|
||
"Send a ^A type interrupt to the Scheme process."
|
||
(interactive "cInterrupt character to send: ")
|
||
(quit-process xscheme-process-name)
|
||
(sleep-for 0.1)
|
||
(xscheme-send-char char)
|
||
(if (and mark-p xscheme-control-g-synchronization-p)
|
||
(xscheme-send-char 0)))
|
||
|
||
;;;; Internal Variables
|
||
|
||
(defvar xscheme-process-command-line nil
|
||
"Command used to start the most recent Scheme process.")
|
||
|
||
(defvar xscheme-process-name "scheme"
|
||
"Name of xscheme process that we're currently interacting with.")
|
||
|
||
(defvar xscheme-buffer-name "*scheme*"
|
||
"Name of xscheme buffer that we're currently interacting with.")
|
||
|
||
(defvar xscheme-expressions-ring-max 30
|
||
"*Maximum length of Scheme expressions ring.")
|
||
|
||
(defvar xscheme-expressions-ring nil
|
||
"List of expressions recently transmitted to the Scheme process.")
|
||
|
||
(defvar xscheme-expressions-ring-yank-pointer nil
|
||
"The tail of the Scheme expressions ring whose car is the last thing yanked.")
|
||
|
||
(defvar xscheme-last-input-end)
|
||
|
||
(defvar xscheme-process-filter-state 'idle
|
||
"State of scheme process escape reader state machine:
|
||
idle waiting for an escape sequence
|
||
reading-type received an altmode but nothing else
|
||
reading-string reading prompt string")
|
||
|
||
(defvar xscheme-running-p nil
|
||
"This variable, if nil, indicates that the scheme process is
|
||
waiting for input. Otherwise, it is busy evaluating something.")
|
||
|
||
(defconst xscheme-control-g-synchronization-p t
|
||
"If non-nil, insert markers in the scheme input stream to indicate when
|
||
control-g interrupts were signaled. Do not allow more control-g's to be
|
||
signaled until the scheme process acknowledges receipt.")
|
||
|
||
(defvar xscheme-control-g-disabled-p nil
|
||
"This variable, if non-nil, indicates that a control-g is being processed
|
||
by the scheme process, so additional control-g's are to be ignored.")
|
||
|
||
(defvar xscheme-allow-output-p t
|
||
"This variable, if nil, prevents output from the scheme process
|
||
from being inserted into the process-buffer.")
|
||
|
||
(defvar xscheme-prompt ""
|
||
"The current scheme prompt string.")
|
||
|
||
(defvar xscheme-string-accumulator ""
|
||
"Accumulator for the string being received from the scheme process.")
|
||
|
||
(defvar xscheme-string-receiver nil
|
||
"Procedure to send the string argument from the scheme process.")
|
||
|
||
(defconst default-xscheme-runlight
|
||
'(": " xscheme-runlight-string)
|
||
"Default global (shared) xscheme-runlight modeline format.")
|
||
|
||
(defvar xscheme-runlight "")
|
||
(defvar xscheme-runlight-string nil)
|
||
(defvar xscheme-mode-string nil)
|
||
(setq-default scheme-mode-line-process
|
||
'("" xscheme-runlight))
|
||
|
||
(mapcar 'make-variable-buffer-local
|
||
'(xscheme-expressions-ring
|
||
xscheme-expressions-ring-yank-pointer
|
||
xscheme-process-filter-state
|
||
xscheme-running-p
|
||
xscheme-control-g-disabled-p
|
||
xscheme-allow-output-p
|
||
xscheme-prompt
|
||
xscheme-string-accumulator
|
||
xscheme-mode-string
|
||
scheme-mode-line-process))
|
||
|
||
;;;; Basic Process Control
|
||
|
||
(defun xscheme-start-process (command-line the-process the-buffer)
|
||
(let ((buffer (get-buffer-create the-buffer)))
|
||
(let ((process (get-buffer-process buffer)))
|
||
(save-excursion
|
||
(set-buffer buffer)
|
||
(if (and process (memq (process-status process) '(run stop)))
|
||
(set-marker (process-mark process) (point-max))
|
||
(progn (if process (delete-process process))
|
||
(goto-char (point-max))
|
||
(scheme-interaction-mode nil)
|
||
(setq xscheme-process-name the-process)
|
||
(if (bobp)
|
||
(insert-before-markers
|
||
(substitute-command-keys xscheme-startup-message)))
|
||
(setq process
|
||
(let ((process-connection-type nil))
|
||
(apply 'start-process
|
||
(cons the-process
|
||
(cons buffer
|
||
(xscheme-parse-command-line
|
||
command-line))))))
|
||
(if (not (equal (process-name process) the-process))
|
||
(setq xscheme-process-name (process-name process)))
|
||
(if (not (equal (buffer-name buffer) the-buffer))
|
||
(setq xscheme-buffer-name (buffer-name buffer)))
|
||
(message "Starting process %s in buffer %s"
|
||
xscheme-process-name
|
||
xscheme-buffer-name)
|
||
(set-marker (process-mark process) (point-max))
|
||
(xscheme-process-filter-initialize t)
|
||
(xscheme-modeline-initialize xscheme-buffer-name)
|
||
(set-process-sentinel process 'xscheme-process-sentinel)
|
||
(set-process-filter process 'xscheme-process-filter)
|
||
(run-hooks 'xscheme-start-hook)))))
|
||
buffer))
|
||
|
||
(defun xscheme-parse-command-line (string)
|
||
(setq string (substitute-in-file-name string))
|
||
(let ((start 0)
|
||
(result '()))
|
||
(while start
|
||
(let ((index (string-match "[ \t]" string start)))
|
||
(setq start
|
||
(cond ((not index)
|
||
(setq result
|
||
(cons (substring string start)
|
||
result))
|
||
nil)
|
||
((= index start)
|
||
(string-match "[^ \t]" string start))
|
||
(t
|
||
(setq result
|
||
(cons (substring string start index)
|
||
result))
|
||
(1+ index))))))
|
||
(nreverse result)))
|
||
|
||
(defun xscheme-wait-for-process ()
|
||
(sleep-for 2)
|
||
(while xscheme-running-p
|
||
(sleep-for 1)))
|
||
|
||
(defun xscheme-process-running-p ()
|
||
"True iff there is a Scheme process whose status is `run'."
|
||
(let ((process (get-process xscheme-process-name)))
|
||
(and process
|
||
(eq (process-status process) 'run))))
|
||
|
||
(defun xscheme-process-buffer ()
|
||
(let ((process (get-process xscheme-process-name)))
|
||
(and process (process-buffer process))))
|
||
|
||
(defun xscheme-process-buffer-window ()
|
||
(let ((buffer (xscheme-process-buffer)))
|
||
(and buffer (get-buffer-window buffer))))
|
||
|
||
(defun xscheme-process-buffer-current-p ()
|
||
"True iff the current buffer is the Scheme process buffer."
|
||
(eq (xscheme-process-buffer) (current-buffer)))
|
||
|
||
;;;; Process Filter
|
||
|
||
(defun xscheme-process-sentinel (proc reason)
|
||
(let* ((buffer (process-buffer proc))
|
||
(name (buffer-name buffer)))
|
||
(save-excursion
|
||
(set-buffer buffer)
|
||
(xscheme-process-filter-initialize (eq reason 'run))
|
||
(if (not (eq reason 'run))
|
||
(progn
|
||
(setq scheme-mode-line-process "")
|
||
(setq xscheme-mode-string "no process")
|
||
(if (equal name (default-value 'xscheme-buffer-name))
|
||
(setq-default xscheme-runlight ""))))
|
||
(if (and (not (memq reason '(run stop)))
|
||
xscheme-signal-death-message)
|
||
(progn
|
||
(beep)
|
||
(message
|
||
"The Scheme process has died! Do M-x reset-scheme to restart it"))))))
|
||
|
||
(defun xscheme-process-filter-initialize (running-p)
|
||
(setq xscheme-process-filter-state 'idle)
|
||
(setq xscheme-running-p running-p)
|
||
(setq xscheme-control-g-disabled-p nil)
|
||
(setq xscheme-allow-output-p t)
|
||
(setq xscheme-prompt "")
|
||
(if running-p
|
||
(let ((name (buffer-name (current-buffer))))
|
||
(setq scheme-mode-line-process '(": " xscheme-runlight-string))
|
||
(xscheme-modeline-initialize name)
|
||
(if (equal name (default-value 'xscheme-buffer-name))
|
||
(setq-default xscheme-runlight default-xscheme-runlight))))
|
||
(if (or (eq xscheme-runlight default-xscheme-runlight)
|
||
(equal xscheme-runlight ""))
|
||
(setq xscheme-runlight (list ": " 'xscheme-buffer-name ": " "?")))
|
||
(rplaca (nthcdr 3 xscheme-runlight)
|
||
(if running-p "?" "no process")))
|
||
|
||
(defun xscheme-process-filter (proc string)
|
||
(let ((xscheme-filter-input string)
|
||
(call-noexcursion nil))
|
||
(while xscheme-filter-input
|
||
(setq call-noexcursion nil)
|
||
(save-excursion
|
||
(set-buffer (process-buffer proc))
|
||
(cond ((eq xscheme-process-filter-state 'idle)
|
||
(let ((start (string-match "\e" xscheme-filter-input)))
|
||
(if start
|
||
(progn
|
||
(xscheme-process-filter-output
|
||
(substring xscheme-filter-input 0 start))
|
||
(setq xscheme-filter-input
|
||
(substring xscheme-filter-input (1+ start)))
|
||
(setq xscheme-process-filter-state 'reading-type))
|
||
(let ((string xscheme-filter-input))
|
||
(setq xscheme-filter-input nil)
|
||
(xscheme-process-filter-output string)))))
|
||
((eq xscheme-process-filter-state 'reading-type)
|
||
(if (zerop (length xscheme-filter-input))
|
||
(setq xscheme-filter-input nil)
|
||
(let ((char (aref xscheme-filter-input 0)))
|
||
(setq xscheme-filter-input
|
||
(substring xscheme-filter-input 1))
|
||
(let ((entry (assoc char xscheme-process-filter-alist)))
|
||
(if entry
|
||
(funcall (nth 2 entry) (nth 1 entry))
|
||
(progn
|
||
(xscheme-process-filter-output ?\e char)
|
||
(setq xscheme-process-filter-state 'idle)))))))
|
||
((eq xscheme-process-filter-state 'reading-string)
|
||
(let ((start (string-match "\e" xscheme-filter-input)))
|
||
(if start
|
||
(let ((string
|
||
(concat xscheme-string-accumulator
|
||
(substring xscheme-filter-input 0 start))))
|
||
(setq xscheme-filter-input
|
||
(substring xscheme-filter-input (1+ start)))
|
||
(setq xscheme-process-filter-state 'idle)
|
||
(if (listp xscheme-string-receiver)
|
||
(progn
|
||
(setq xscheme-string-receiver
|
||
(car xscheme-string-receiver))
|
||
(setq call-noexcursion string))
|
||
(funcall xscheme-string-receiver string)))
|
||
(progn
|
||
(setq xscheme-string-accumulator
|
||
(concat xscheme-string-accumulator
|
||
xscheme-filter-input))
|
||
(setq xscheme-filter-input nil)))))
|
||
(t
|
||
(error "Scheme process filter -- bad state"))))
|
||
(if call-noexcursion
|
||
(funcall xscheme-string-receiver call-noexcursion)))))
|
||
|
||
;;;; Process Filter Output
|
||
|
||
(defun xscheme-process-filter-output (&rest args)
|
||
(if xscheme-allow-output-p
|
||
(let ((string (apply 'concat args)))
|
||
(save-excursion
|
||
(xscheme-goto-output-point)
|
||
(let ((old-point (point)))
|
||
(while (string-match "\\(\007\\|\f\\)" string)
|
||
(let ((start (match-beginning 0))
|
||
(end (match-end 0)))
|
||
(insert-before-markers (substring string 0 start))
|
||
(if (= ?\f (aref string start))
|
||
(progn
|
||
(if (not (bolp))
|
||
(insert-before-markers ?\n))
|
||
(insert-before-markers ?\f))
|
||
(beep))
|
||
(setq string (substring string (1+ start)))))
|
||
(insert-before-markers string)
|
||
(if (and xscheme-last-input-end
|
||
(equal (marker-position xscheme-last-input-end) (point)))
|
||
(set-marker xscheme-last-input-end old-point)))))))
|
||
|
||
(defun xscheme-guarantee-newlines (n)
|
||
(if xscheme-allow-output-p
|
||
(save-excursion
|
||
(xscheme-goto-output-point)
|
||
(let ((stop nil))
|
||
(while (and (not stop)
|
||
(bolp))
|
||
(setq n (1- n))
|
||
(if (bobp)
|
||
(setq stop t)
|
||
(backward-char))))
|
||
(xscheme-goto-output-point)
|
||
(while (> n 0)
|
||
(insert-before-markers ?\n)
|
||
(setq n (1- n))))))
|
||
|
||
(defun xscheme-goto-output-point ()
|
||
(let ((process (get-process xscheme-process-name)))
|
||
(set-buffer (process-buffer process))
|
||
(goto-char (process-mark process))))
|
||
|
||
(defun xscheme-modeline-initialize (name)
|
||
(setq xscheme-runlight-string "")
|
||
(if (equal name (default-value 'xscheme-buffer-name))
|
||
(setq-default xscheme-runlight-string ""))
|
||
(setq xscheme-mode-string "")
|
||
(setq mode-line-buffer-identification
|
||
(list (concat name ": ")
|
||
'xscheme-mode-string)))
|
||
|
||
(defun xscheme-set-runlight (runlight)
|
||
(setq xscheme-runlight-string runlight)
|
||
(if (equal (buffer-name (current-buffer))
|
||
(default-value 'xscheme-buffer-name))
|
||
(setq-default xscheme-runlight-string runlight))
|
||
(rplaca (nthcdr 3 xscheme-runlight) runlight)
|
||
(force-mode-line-update t))
|
||
|
||
;;;; Process Filter Operations
|
||
|
||
(defvar xscheme-process-filter-alist
|
||
'((?A xscheme-eval
|
||
xscheme-process-filter:string-action-noexcursion)
|
||
(?D xscheme-enter-debugger-mode
|
||
xscheme-process-filter:string-action)
|
||
(?E xscheme-eval
|
||
xscheme-process-filter:string-action)
|
||
(?P xscheme-set-prompt-variable
|
||
xscheme-process-filter:string-action)
|
||
(?R xscheme-enter-interaction-mode
|
||
xscheme-process-filter:simple-action)
|
||
(?b xscheme-start-gc
|
||
xscheme-process-filter:simple-action)
|
||
(?c xscheme-unsolicited-read-char
|
||
xscheme-process-filter:simple-action)
|
||
(?e xscheme-finish-gc
|
||
xscheme-process-filter:simple-action)
|
||
(?f xscheme-exit-input-wait
|
||
xscheme-process-filter:simple-action)
|
||
(?g xscheme-enable-control-g
|
||
xscheme-process-filter:simple-action)
|
||
(?i xscheme-prompt-for-expression
|
||
xscheme-process-filter:string-action)
|
||
(?m xscheme-message
|
||
xscheme-process-filter:string-action)
|
||
(?n xscheme-prompt-for-confirmation
|
||
xscheme-process-filter:string-action)
|
||
(?o xscheme-output-goto
|
||
xscheme-process-filter:simple-action)
|
||
(?p xscheme-set-prompt
|
||
xscheme-process-filter:string-action)
|
||
(?s xscheme-enter-input-wait
|
||
xscheme-process-filter:simple-action)
|
||
(?v xscheme-write-value
|
||
xscheme-process-filter:string-action)
|
||
(?w xscheme-cd
|
||
xscheme-process-filter:string-action)
|
||
(?z xscheme-display-process-buffer
|
||
xscheme-process-filter:simple-action))
|
||
"Table used to decide how to handle process filter commands.
|
||
Value is a list of entries, each entry is a list of three items.
|
||
|
||
The first item is the character that the process filter dispatches on.
|
||
The second item is the action to be taken, a function.
|
||
The third item is the handler for the entry, a function.
|
||
|
||
When the process filter sees a command whose character matches a
|
||
particular entry, it calls the handler with two arguments: the action
|
||
and the string containing the rest of the process filter's input
|
||
stream. It is the responsibility of the handler to invoke the action
|
||
with the appropriate arguments, and to reenter the process filter with
|
||
the remaining input.")
|
||
|
||
(defun xscheme-process-filter:simple-action (action)
|
||
(setq xscheme-process-filter-state 'idle)
|
||
(funcall action))
|
||
|
||
(defun xscheme-process-filter:string-action (action)
|
||
(setq xscheme-string-receiver action)
|
||
(setq xscheme-string-accumulator "")
|
||
(setq xscheme-process-filter-state 'reading-string))
|
||
|
||
(defun xscheme-process-filter:string-action-noexcursion (action)
|
||
(xscheme-process-filter:string-action (cons action nil)))
|
||
|
||
(defconst xscheme-runlight:running "run"
|
||
"The character displayed when the Scheme process is running.")
|
||
|
||
(defconst xscheme-runlight:input "input"
|
||
"The character displayed when the Scheme process is waiting for input.")
|
||
|
||
(defconst xscheme-runlight:gc "gc"
|
||
"The character displayed when the Scheme process is garbage collecting.")
|
||
|
||
(defun xscheme-start-gc ()
|
||
(xscheme-set-runlight xscheme-runlight:gc))
|
||
|
||
(defun xscheme-finish-gc ()
|
||
(xscheme-set-runlight
|
||
(if xscheme-running-p xscheme-runlight:running xscheme-runlight:input)))
|
||
|
||
(defun xscheme-enter-input-wait ()
|
||
(xscheme-set-runlight xscheme-runlight:input)
|
||
(setq xscheme-control-g-disabled-p nil)
|
||
(setq xscheme-running-p nil))
|
||
|
||
(defun xscheme-exit-input-wait ()
|
||
(xscheme-set-runlight xscheme-runlight:running)
|
||
(setq xscheme-running-p t))
|
||
|
||
(defun xscheme-enable-control-g ()
|
||
(setq xscheme-control-g-disabled-p nil)
|
||
(if (string= (current-message) xscheme-control-g-message-string)
|
||
(message nil)))
|
||
|
||
(defun xscheme-display-process-buffer ()
|
||
(let ((window (or (xscheme-process-buffer-window)
|
||
(display-buffer (xscheme-process-buffer)))))
|
||
(save-window-excursion
|
||
(select-window window)
|
||
(xscheme-goto-output-point)
|
||
(if (xscheme-debugger-mode-p)
|
||
(xscheme-enter-interaction-mode)))))
|
||
|
||
(defun xscheme-unsolicited-read-char ()
|
||
nil)
|
||
|
||
(defun xscheme-eval (string)
|
||
(eval (car (read-from-string string))))
|
||
|
||
(defun xscheme-message (string)
|
||
(if (not (zerop (length string)))
|
||
(xscheme-write-message-1 string (format ";%s" string))))
|
||
|
||
(defun xscheme-write-value (string)
|
||
(if (zerop (length string))
|
||
(xscheme-write-message-1 "(no value)" ";Unspecified return value")
|
||
(xscheme-write-message-1 string (format ";Value: %s" string))))
|
||
|
||
(defun xscheme-write-message-1 (message-string output-string)
|
||
(let* ((process (get-process xscheme-process-name))
|
||
(window (get-buffer-window (process-buffer process))))
|
||
(if (or (not window)
|
||
(not (pos-visible-in-window-p (process-mark process)
|
||
window)))
|
||
(message "%s" message-string)))
|
||
(xscheme-guarantee-newlines 1)
|
||
(xscheme-process-filter-output output-string))
|
||
|
||
(defun xscheme-set-prompt-variable (string)
|
||
(setq xscheme-prompt string))
|
||
|
||
(defun xscheme-set-prompt (string)
|
||
(setq xscheme-prompt string)
|
||
(xscheme-guarantee-newlines 2)
|
||
(setq xscheme-mode-string (xscheme-coerce-prompt string))
|
||
(force-mode-line-update t))
|
||
|
||
(defun xscheme-output-goto ()
|
||
(xscheme-goto-output-point)
|
||
(xscheme-guarantee-newlines 2))
|
||
|
||
(defun xscheme-coerce-prompt (string)
|
||
(if (string-match "^[0-9]+ \\[[^]]+\\] " string)
|
||
(let ((end (match-end 0)))
|
||
(xscheme-process-filter-output (substring string end))
|
||
(substring string 0 (- end 1)))
|
||
string))
|
||
|
||
(defun xscheme-cd (directory-string)
|
||
(save-excursion
|
||
(set-buffer (xscheme-process-buffer))
|
||
(cd directory-string)))
|
||
|
||
(defun xscheme-prompt-for-confirmation (prompt-string)
|
||
(xscheme-send-char (if (y-or-n-p prompt-string) ?y ?n)))
|
||
|
||
(defun xscheme-prompt-for-expression (prompt-string)
|
||
(xscheme-send-string-2
|
||
(read-from-minibuffer prompt-string nil xscheme-prompt-for-expression-map)))
|
||
|
||
(defvar xscheme-prompt-for-expression-map nil)
|
||
(if (not xscheme-prompt-for-expression-map)
|
||
(progn
|
||
(setq xscheme-prompt-for-expression-map
|
||
(copy-keymap minibuffer-local-map))
|
||
(substitute-key-definition 'exit-minibuffer
|
||
'xscheme-prompt-for-expression-exit
|
||
xscheme-prompt-for-expression-map)))
|
||
|
||
(defun xscheme-prompt-for-expression-exit ()
|
||
(interactive)
|
||
(if (eq (xscheme-region-expression-p (point-min) (point-max)) 'one)
|
||
(exit-minibuffer)
|
||
(error "input must be a single, complete expression")))
|
||
|
||
(defun xscheme-region-expression-p (start end)
|
||
(save-excursion
|
||
(let ((old-syntax-table (syntax-table)))
|
||
(unwind-protect
|
||
(progn
|
||
(set-syntax-table scheme-mode-syntax-table)
|
||
(let ((state (parse-partial-sexp start end)))
|
||
(and (zerop (car state)) ;depth = 0
|
||
(nth 2 state) ;last-sexp exists, i.e. >= 1 sexps
|
||
(let ((state (parse-partial-sexp start (nth 2 state))))
|
||
(if (nth 2 state) 'many 'one)))))
|
||
(set-syntax-table old-syntax-table)))))
|
||
|
||
(provide 'xscheme)
|
||
|
||
;;; xscheme.el ends here
|