Commit | Line | Data |
---|---|---|
76d7458e ER |
1 | ;;; xscheme.el --- run Scheme under Emacs |
2 | ||
eea8d4ef ER |
3 | ;; Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc. |
4 | ||
d46bac56 | 5 | ;; Maintainer: FSF |
b7f66977 | 6 | ;; Keywords: languages, lisp |
6cf0d154 | 7 | |
a1ad21ca CH |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
a1ad21ca CH |
13 | ;; any later version. |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
22 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
6cf0d154 ER |
24 | ;;; Commentary: |
25 | ||
c91c4e6d ER |
26 | ;; A major mode for editing Scheme and interacting with MIT's C-Scheme. |
27 | ;; | |
28 | ;; Requires C-Scheme release 5 or later | |
29 | ;; Changes to Control-G handler require runtime version 13.85 or later | |
a1ad21ca | 30 | |
6cf0d154 ER |
31 | ;;; Code: |
32 | ||
a1ad21ca CH |
33 | (require 'scheme) |
34 | \f | |
35 | (defvar scheme-program-name "scheme" | |
36 | "*Program invoked by the `run-scheme' command.") | |
37 | ||
38 | (defvar scheme-band-name nil | |
39 | "*Band loaded by the `run-scheme' command.") | |
40 | ||
41 | (defvar scheme-program-arguments nil | |
42 | "*Arguments passed to the Scheme program by the `run-scheme' command.") | |
43 | ||
44 | (defvar xscheme-allow-pipelined-evaluation t | |
45 | "If non-nil, an expression may be transmitted while another is evaluating. | |
46 | Otherwise, attempting to evaluate an expression before the previous expression | |
47 | has finished evaluating will signal an error.") | |
48 | ||
49 | (defvar xscheme-startup-message | |
50 | "This is the Scheme process buffer. | |
51 | Type \\[advertised-xscheme-send-previous-expression] to evaluate the expression before point. | |
52 | Type \\[xscheme-send-control-g-interrupt] to abort evaluation. | |
53 | Type \\[describe-mode] for more information. | |
54 | ||
55 | " | |
56 | "String to insert into Scheme process buffer first time it is started. | |
57 | Is processed with `substitute-command-keys' first.") | |
58 | ||
59 | (defvar xscheme-signal-death-message nil | |
60 | "If non-nil, causes a message to be generated when the Scheme process dies.") | |
61 | ||
62 | (defun xscheme-evaluation-commands (keymap) | |
63 | (define-key keymap "\e\C-x" 'xscheme-send-definition) | |
64 | (define-key keymap "\C-x\C-e" 'advertised-xscheme-send-previous-expression) | |
65 | (define-key keymap "\eo" 'xscheme-send-buffer) | |
66 | (define-key keymap "\ez" 'xscheme-send-definition) | |
67 | (define-key keymap "\e\C-m" 'xscheme-send-previous-expression) | |
68 | (define-key keymap "\e\C-z" 'xscheme-send-region)) | |
69 | ||
70 | (defun xscheme-interrupt-commands (keymap) | |
71 | (define-key keymap "\C-c\C-s" 'xscheme-select-process-buffer) | |
72 | (define-key keymap "\C-c\C-b" 'xscheme-send-breakpoint-interrupt) | |
73 | (define-key keymap "\C-c\C-c" 'xscheme-send-control-g-interrupt) | |
74 | (define-key keymap "\C-c\C-u" 'xscheme-send-control-u-interrupt) | |
75 | (define-key keymap "\C-c\C-x" 'xscheme-send-control-x-interrupt)) | |
76 | ||
77 | (xscheme-evaluation-commands scheme-mode-map) | |
78 | (xscheme-interrupt-commands scheme-mode-map) | |
79 | \f | |
80 | (defun run-scheme (command-line) | |
0178cafa | 81 | "Run MIT Scheme in an inferior process. |
a1ad21ca CH |
82 | Output goes to the buffer `*scheme*'. |
83 | With argument, asks for a command line." | |
84 | (interactive | |
85 | (list (let ((default | |
86 | (or xscheme-process-command-line | |
87 | (xscheme-default-command-line)))) | |
88 | (if current-prefix-arg | |
89 | (read-string "Run Scheme: " default) | |
90 | default)))) | |
91 | (setq xscheme-process-command-line command-line) | |
92 | (switch-to-buffer (xscheme-start-process command-line))) | |
93 | ||
94 | (defun reset-scheme () | |
95 | "Reset the Scheme process." | |
96 | (interactive) | |
97 | (let ((process (get-process "scheme"))) | |
98 | (cond ((or (not process) | |
99 | (not (eq (process-status process) 'run)) | |
100 | (yes-or-no-p | |
101 | "The Scheme process is running, are you SURE you want to reset it? ")) | |
102 | (message "Resetting Scheme process...") | |
103 | (if process (kill-process process t)) | |
104 | (xscheme-start-process xscheme-process-command-line) | |
105 | (message "Resetting Scheme process...done"))))) | |
106 | ||
107 | (defun xscheme-default-command-line () | |
108 | (concat scheme-program-name " -emacs" | |
109 | (if scheme-program-arguments | |
110 | (concat " " scheme-program-arguments) | |
111 | "") | |
112 | (if scheme-band-name | |
113 | (concat " -band " scheme-band-name) | |
114 | ""))) | |
115 | \f | |
116 | ;;;; Interaction Mode | |
117 | ||
118 | (defun scheme-interaction-mode () | |
119 | "Major mode for interacting with the inferior Scheme process. | |
120 | Like scheme-mode except that: | |
121 | ||
122 | \\[advertised-xscheme-send-previous-expression] sends the expression before point to the Scheme process as input | |
123 | \\[xscheme-yank-previous-send] yanks the expression most recently sent to Scheme | |
124 | ||
125 | All output from the Scheme process is written in the Scheme process | |
126 | buffer, which is initially named \"*scheme*\". The result of | |
127 | evaluating a Scheme expression is also printed in the process buffer, | |
128 | preceded by the string \";Value: \" to highlight it. If the process | |
129 | buffer is not visible at that time, the value will also be displayed | |
130 | in the minibuffer. If an error occurs, the process buffer will | |
131 | automatically pop up to show you the error message. | |
132 | ||
133 | While the Scheme process is running, the modelines of all buffers in | |
134 | scheme-mode are modified to show the state of the process. The | |
135 | possible states and their meanings are: | |
136 | ||
137 | input waiting for input | |
138 | run evaluating | |
139 | gc garbage collecting | |
140 | ||
141 | The process buffer's modeline contains additional information where | |
142 | the buffer's name is normally displayed: the command interpreter level | |
143 | and type. | |
144 | ||
145 | Scheme maintains a stack of command interpreters. Every time an error | |
146 | or breakpoint occurs, the current command interpreter is pushed on the | |
147 | command interpreter stack, and a new command interpreter is started. | |
148 | One example of why this is done is so that an error that occurs while | |
149 | you are debugging another error will not destroy the state of the | |
150 | initial error, allowing you to return to it after the second error has | |
151 | been fixed. | |
152 | ||
153 | The command interpreter level indicates how many interpreters are in | |
154 | the command interpreter stack. It is initially set to one, and it is | |
155 | incremented every time that stack is pushed, and decremented every | |
156 | time it is popped. The following commands are useful for manipulating | |
157 | the command interpreter stack: | |
158 | ||
159 | \\[xscheme-send-breakpoint-interrupt] pushes the stack once | |
160 | \\[xscheme-send-control-u-interrupt] pops the stack once | |
161 | \\[xscheme-send-control-g-interrupt] pops everything off | |
162 | \\[xscheme-send-control-x-interrupt] aborts evaluation, doesn't affect stack | |
163 | ||
164 | Some possible command interpreter types and their meanings are: | |
165 | ||
166 | [Evaluator] read-eval-print loop for evaluating expressions | |
167 | [Debugger] single character commands for debugging errors | |
168 | [Where] single character commands for examining environments | |
169 | ||
170 | Starting with release 6.2 of Scheme, the latter two types of command | |
171 | interpreters will change the major mode of the Scheme process buffer | |
172 | to scheme-debugger-mode , in which the evaluation commands are | |
173 | disabled, and the keys which normally self insert instead send | |
174 | themselves to the Scheme process. The command character ? will list | |
175 | the available commands. | |
176 | ||
177 | For older releases of Scheme, the major mode will be be | |
178 | scheme-interaction-mode , and the command characters must be sent as | |
179 | if they were expressions. | |
180 | ||
181 | Commands: | |
182 | Delete converts tabs to spaces as it moves back. | |
183 | Blank lines separate paragraphs. Semicolons start comments. | |
184 | \\{scheme-interaction-mode-map} | |
185 | ||
186 | Entry to this mode calls the value of scheme-interaction-mode-hook | |
187 | with no args, if that value is non-nil. | |
188 | Likewise with the value of scheme-mode-hook. | |
189 | scheme-interaction-mode-hook is called after scheme-mode-hook." | |
190 | (interactive) | |
191 | (kill-all-local-variables) | |
192 | (scheme-interaction-mode-initialize) | |
193 | (scheme-mode-variables) | |
194 | (make-local-variable 'xscheme-previous-send) | |
195 | (run-hooks 'scheme-mode-hook 'scheme-interaction-mode-hook)) | |
196 | ||
197 | (defun scheme-interaction-mode-initialize () | |
198 | (use-local-map scheme-interaction-mode-map) | |
199 | (setq major-mode 'scheme-interaction-mode) | |
200 | (setq mode-name "Scheme Interaction")) | |
201 | ||
202 | (defun scheme-interaction-mode-commands (keymap) | |
203 | (define-key keymap "\C-c\C-m" 'xscheme-send-current-line) | |
204 | (define-key keymap "\C-c\C-p" 'xscheme-send-proceed) | |
205 | (define-key keymap "\C-c\C-y" 'xscheme-yank-previous-send)) | |
206 | ||
207 | (defvar scheme-interaction-mode-map nil) | |
208 | (if (not scheme-interaction-mode-map) | |
209 | (progn | |
210 | (setq scheme-interaction-mode-map (make-keymap)) | |
211 | (scheme-mode-commands scheme-interaction-mode-map) | |
212 | (xscheme-interrupt-commands scheme-interaction-mode-map) | |
213 | (xscheme-evaluation-commands scheme-interaction-mode-map) | |
214 | (scheme-interaction-mode-commands scheme-interaction-mode-map))) | |
215 | ||
216 | (defun xscheme-enter-interaction-mode () | |
217 | (save-excursion | |
218 | (set-buffer (xscheme-process-buffer)) | |
219 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
220 | (if (eq major-mode 'scheme-debugger-mode) | |
221 | (scheme-interaction-mode-initialize) | |
222 | (scheme-interaction-mode))))) | |
223 | ||
224 | (fset 'advertised-xscheme-send-previous-expression | |
225 | 'xscheme-send-previous-expression) | |
226 | \f | |
227 | ;;;; Debugger Mode | |
228 | ||
229 | (defun scheme-debugger-mode () | |
230 | "Major mode for executing the Scheme debugger. | |
231 | Like scheme-mode except that the evaluation commands | |
232 | are disabled, and characters that would normally be self inserting are | |
233 | sent to the Scheme process instead. Typing ? will show you which | |
234 | characters perform useful functions. | |
235 | ||
236 | Commands: | |
237 | \\{scheme-debugger-mode-map}" | |
238 | (error "Illegal entry to scheme-debugger-mode")) | |
239 | ||
240 | (defun scheme-debugger-mode-initialize () | |
241 | (use-local-map scheme-debugger-mode-map) | |
242 | (setq major-mode 'scheme-debugger-mode) | |
243 | (setq mode-name "Scheme Debugger")) | |
244 | ||
245 | (defun scheme-debugger-mode-commands (keymap) | |
246 | (let ((char ? )) | |
247 | (while (< char 127) | |
248 | (define-key keymap (char-to-string char) 'scheme-debugger-self-insert) | |
249 | (setq char (1+ char))))) | |
250 | ||
251 | (defvar scheme-debugger-mode-map nil) | |
252 | (if (not scheme-debugger-mode-map) | |
253 | (progn | |
254 | (setq scheme-debugger-mode-map (make-keymap)) | |
255 | (scheme-mode-commands scheme-debugger-mode-map) | |
256 | (xscheme-interrupt-commands scheme-debugger-mode-map) | |
257 | (scheme-debugger-mode-commands scheme-debugger-mode-map))) | |
258 | ||
259 | (defun scheme-debugger-self-insert () | |
260 | "Transmit this character to the Scheme process." | |
261 | (interactive) | |
262 | (xscheme-send-char last-command-char)) | |
263 | ||
264 | (defun xscheme-enter-debugger-mode (prompt-string) | |
265 | (save-excursion | |
266 | (set-buffer (xscheme-process-buffer)) | |
267 | (if (not (eq major-mode 'scheme-debugger-mode)) | |
268 | (progn | |
269 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
270 | (scheme-interaction-mode)) | |
271 | (scheme-debugger-mode-initialize))))) | |
272 | ||
273 | (defun xscheme-debugger-mode-p () | |
274 | (let ((buffer (xscheme-process-buffer))) | |
275 | (and buffer | |
276 | (save-excursion | |
277 | (set-buffer buffer) | |
278 | (eq major-mode 'scheme-debugger-mode))))) | |
279 | \f | |
280 | ;;;; Evaluation Commands | |
281 | ||
282 | (defun xscheme-send-string (&rest strings) | |
283 | "Send the string arguments to the Scheme process. | |
284 | The strings are concatenated and terminated by a newline." | |
285 | (cond ((not (xscheme-process-running-p)) | |
286 | (if (yes-or-no-p "The Scheme process has died. Reset it? ") | |
287 | (progn | |
288 | (reset-scheme) | |
289 | (xscheme-wait-for-process) | |
290 | (goto-char (point-max)) | |
291 | (apply 'insert-before-markers strings) | |
292 | (xscheme-send-string-1 strings)))) | |
293 | ((xscheme-debugger-mode-p) (error "No sends allowed in debugger mode")) | |
294 | ((and (not xscheme-allow-pipelined-evaluation) | |
295 | xscheme-running-p) | |
296 | (error "No sends allowed while Scheme running")) | |
297 | (t (xscheme-send-string-1 strings)))) | |
298 | ||
299 | (defun xscheme-send-string-1 (strings) | |
300 | (let ((string (apply 'concat strings))) | |
301 | (xscheme-send-string-2 string) | |
302 | (if (eq major-mode 'scheme-interaction-mode) | |
303 | (setq xscheme-previous-send string)))) | |
304 | ||
305 | (defun xscheme-send-string-2 (string) | |
306 | (let ((process (get-process "scheme"))) | |
307 | (send-string process (concat string "\n")) | |
308 | (if (xscheme-process-buffer-current-p) | |
309 | (set-marker (process-mark process) (point))))) | |
310 | ||
311 | (defun xscheme-yank-previous-send () | |
312 | "Insert the most recent expression at point." | |
313 | (interactive) | |
314 | (push-mark) | |
315 | (insert xscheme-previous-send)) | |
316 | ||
317 | (defun xscheme-select-process-buffer () | |
318 | "Select the Scheme process buffer and move to its output point." | |
319 | (interactive) | |
320 | (let ((process (or (get-process "scheme") (error "No scheme process")))) | |
321 | (let ((buffer (or (process-buffer process) (error "No process buffer")))) | |
322 | (let ((window (get-buffer-window buffer))) | |
323 | (if window | |
324 | (select-window window) | |
325 | (switch-to-buffer buffer)) | |
326 | (goto-char (process-mark process)))))) | |
327 | \f | |
328 | (defun xscheme-send-region (start end) | |
329 | "Send the current region to the Scheme process. | |
330 | The region is sent terminated by a newline." | |
331 | (interactive "r") | |
332 | (if (xscheme-process-buffer-current-p) | |
333 | (progn (goto-char end) | |
334 | (set-marker (process-mark (get-process "scheme")) end))) | |
335 | (xscheme-send-string (buffer-substring start end))) | |
336 | ||
337 | (defun xscheme-send-definition () | |
338 | "Send the current definition to the Scheme process. | |
339 | If the current line begins with a non-whitespace character, | |
340 | parse an expression from the beginning of the line and send that instead." | |
341 | (interactive) | |
342 | (let ((start nil) (end nil)) | |
343 | (save-excursion | |
344 | (end-of-defun) | |
345 | (setq end (point)) | |
346 | (if (re-search-backward "^\\s(" nil t) | |
347 | (setq start (point)) | |
348 | (error "Can't find definition"))) | |
349 | (xscheme-send-region start end))) | |
350 | ||
351 | (defun xscheme-send-next-expression () | |
352 | "Send the expression to the right of `point' to the Scheme process." | |
353 | (interactive) | |
354 | (let ((start (point))) | |
355 | (xscheme-send-region start (save-excursion (forward-sexp) (point))))) | |
356 | ||
357 | (defun xscheme-send-previous-expression () | |
358 | "Send the expression to the left of `point' to the Scheme process." | |
359 | (interactive) | |
360 | (let ((end (point))) | |
361 | (xscheme-send-region (save-excursion (backward-sexp) (point)) end))) | |
362 | \f | |
363 | (defun xscheme-send-current-line () | |
364 | "Send the current line to the Scheme process. | |
365 | Useful for working with debugging Scheme under adb." | |
366 | (interactive) | |
367 | (let ((line | |
368 | (save-excursion | |
369 | (beginning-of-line) | |
370 | (let ((start (point))) | |
371 | (end-of-line) | |
372 | (buffer-substring start (point)))))) | |
373 | (end-of-line) | |
374 | (insert ?\n) | |
375 | (xscheme-send-string-2 line))) | |
376 | ||
377 | (defun xscheme-send-buffer () | |
378 | "Send the current buffer to the Scheme process." | |
379 | (interactive) | |
380 | (if (xscheme-process-buffer-current-p) | |
381 | (error "Not allowed to send this buffer's contents to Scheme")) | |
382 | (xscheme-send-region (point-min) (point-max))) | |
383 | ||
384 | (defun xscheme-send-char (char) | |
385 | "Prompt for a character and send it to the Scheme process." | |
386 | (interactive "cCharacter to send: ") | |
387 | (send-string "scheme" (char-to-string char))) | |
388 | \f | |
389 | ;;;; Interrupts | |
390 | ||
391 | (defun xscheme-send-breakpoint-interrupt () | |
392 | "Cause the Scheme process to enter a breakpoint." | |
393 | (interactive) | |
394 | (xscheme-send-interrupt ?b nil)) | |
395 | ||
396 | (defun xscheme-send-proceed () | |
397 | "Cause the Scheme process to proceed from a breakpoint." | |
398 | (interactive) | |
399 | (send-string "scheme" "(proceed)\n")) | |
400 | ||
401 | (defun xscheme-send-control-g-interrupt () | |
402 | "Cause the Scheme processor to halt and flush input. | |
403 | Control returns to the top level rep loop." | |
404 | (interactive) | |
405 | (let ((inhibit-quit t)) | |
406 | (cond ((not xscheme-control-g-synchronization-p) | |
407 | (interrupt-process "scheme")) | |
408 | (xscheme-control-g-disabled-p | |
409 | (message "Relax...")) | |
410 | (t | |
411 | (setq xscheme-control-g-disabled-p t) | |
412 | (message "Sending C-G interrupt to Scheme...") | |
413 | (interrupt-process "scheme") | |
414 | (send-string "scheme" (char-to-string 0)))))) | |
415 | ||
416 | (defun xscheme-send-control-u-interrupt () | |
417 | "Cause the Scheme process to halt, returning to previous rep loop." | |
418 | (interactive) | |
419 | (xscheme-send-interrupt ?u t)) | |
420 | ||
421 | (defun xscheme-send-control-x-interrupt () | |
422 | "Cause the Scheme process to halt, returning to current rep loop." | |
423 | (interactive) | |
424 | (xscheme-send-interrupt ?x t)) | |
425 | ||
426 | ;;; This doesn't really work right -- Scheme just gobbles the first | |
427 | ;;; character in the input. There is no way for us to guarantee that | |
428 | ;;; the argument to this procedure is the first char unless we put | |
429 | ;;; some kind of marker in the input stream. | |
430 | ||
431 | (defun xscheme-send-interrupt (char mark-p) | |
432 | "Send a ^A type interrupt to the Scheme process." | |
433 | (interactive "cInterrupt character to send: ") | |
434 | (quit-process "scheme") | |
435 | (send-string "scheme" (char-to-string char)) | |
436 | (if (and mark-p xscheme-control-g-synchronization-p) | |
437 | (send-string "scheme" (char-to-string 0)))) | |
438 | \f | |
439 | ;;;; Internal Variables | |
440 | ||
441 | (defvar xscheme-process-command-line nil | |
442 | "Command used to start the most recent Scheme process.") | |
443 | ||
444 | (defvar xscheme-previous-send "" | |
445 | "Most recent expression transmitted to the Scheme process.") | |
446 | ||
447 | (defvar xscheme-process-filter-state 'idle | |
448 | "State of scheme process escape reader state machine: | |
449 | idle waiting for an escape sequence | |
450 | reading-type received an altmode but nothing else | |
451 | reading-string reading prompt string") | |
452 | ||
453 | (defvar xscheme-running-p nil | |
454 | "This variable, if nil, indicates that the scheme process is | |
455 | waiting for input. Otherwise, it is busy evaluating something.") | |
456 | ||
457 | (defconst xscheme-control-g-synchronization-p t | |
458 | "If non-nil, insert markers in the scheme input stream to indicate when | |
459 | control-g interrupts were signalled. Do not allow more control-g's to be | |
460 | signalled until the scheme process acknowledges receipt.") | |
461 | ||
462 | (defvar xscheme-control-g-disabled-p nil | |
463 | "This variable, if non-nil, indicates that a control-g is being processed | |
464 | by the scheme process, so additional control-g's are to be ignored.") | |
465 | ||
466 | (defvar xscheme-allow-output-p t | |
467 | "This variable, if nil, prevents output from the scheme process | |
468 | from being inserted into the process-buffer.") | |
469 | ||
470 | (defvar xscheme-prompt "" | |
471 | "The current scheme prompt string.") | |
472 | ||
473 | (defvar xscheme-string-accumulator "" | |
474 | "Accumulator for the string being received from the scheme process.") | |
475 | ||
476 | (defvar xscheme-string-receiver nil | |
477 | "Procedure to send the string argument from the scheme process.") | |
478 | ||
479 | (defvar xscheme-start-hook nil | |
480 | "If non-nil, a procedure to call when the Scheme process is started. | |
481 | When called, the current buffer will be the Scheme process-buffer.") | |
482 | ||
483 | (defvar xscheme-runlight-string nil) | |
484 | (defvar xscheme-mode-string nil) | |
485 | (defvar xscheme-filter-input nil) | |
486 | \f | |
487 | ;;;; Basic Process Control | |
488 | ||
489 | (defun xscheme-start-process (command-line) | |
490 | (let ((buffer (get-buffer-create "*scheme*"))) | |
491 | (let ((process (get-buffer-process buffer))) | |
492 | (save-excursion | |
493 | (set-buffer buffer) | |
494 | (if (and process (memq (process-status process) '(run stop))) | |
495 | (set-marker (process-mark process) (point-max)) | |
496 | (progn (if process (delete-process process)) | |
497 | (goto-char (point-max)) | |
498 | (scheme-interaction-mode) | |
499 | (if (bobp) | |
500 | (insert-before-markers | |
501 | (substitute-command-keys xscheme-startup-message))) | |
502 | (setq process | |
503 | (let ((process-connection-type nil)) | |
504 | (apply 'start-process | |
505 | (cons "scheme" | |
506 | (cons buffer | |
507 | (xscheme-parse-command-line | |
508 | command-line)))))) | |
509 | (set-marker (process-mark process) (point-max)) | |
510 | (xscheme-process-filter-initialize t) | |
511 | (xscheme-modeline-initialize) | |
512 | (set-process-sentinel process 'xscheme-process-sentinel) | |
513 | (set-process-filter process 'xscheme-process-filter) | |
514 | (run-hooks 'xscheme-start-hook))))) | |
515 | buffer)) | |
516 | ||
517 | (defun xscheme-parse-command-line (string) | |
518 | (setq string (substitute-in-file-name string)) | |
519 | (let ((start 0) | |
520 | (result '())) | |
521 | (while start | |
522 | (let ((index (string-match "[ \t]" string start))) | |
523 | (setq start | |
524 | (cond ((not index) | |
525 | (setq result | |
526 | (cons (substring string start) | |
527 | result)) | |
528 | nil) | |
529 | ((= index start) | |
530 | (string-match "[^ \t]" string start)) | |
531 | (t | |
532 | (setq result | |
533 | (cons (substring string start index) | |
534 | result)) | |
535 | (1+ index)))))) | |
536 | (nreverse result))) | |
537 | \f | |
538 | (defun xscheme-wait-for-process () | |
539 | (sleep-for 2) | |
540 | (while xscheme-running-p | |
541 | (sleep-for 1))) | |
542 | ||
543 | (defun xscheme-process-running-p () | |
544 | "True iff there is a Scheme process whose status is `run'." | |
545 | (let ((process (get-process "scheme"))) | |
546 | (and process | |
547 | (eq (process-status process) 'run)))) | |
548 | ||
549 | (defun xscheme-process-buffer () | |
550 | (let ((process (get-process "scheme"))) | |
551 | (and process (process-buffer process)))) | |
552 | ||
553 | (defun xscheme-process-buffer-window () | |
554 | (let ((buffer (xscheme-process-buffer))) | |
555 | (and buffer (get-buffer-window buffer)))) | |
556 | ||
557 | (defun xscheme-process-buffer-current-p () | |
558 | "True iff the current buffer is the Scheme process buffer." | |
559 | (eq (xscheme-process-buffer) (current-buffer))) | |
560 | \f | |
561 | ;;;; Process Filter | |
562 | ||
563 | (defun xscheme-process-sentinel (proc reason) | |
564 | (xscheme-process-filter-initialize (eq reason 'run)) | |
565 | (if (eq reason 'run) | |
566 | (xscheme-modeline-initialize) | |
567 | (progn | |
568 | (setq scheme-mode-line-process "") | |
569 | (setq xscheme-mode-string "no process"))) | |
570 | (if (and (not (memq reason '(run stop))) | |
571 | xscheme-signal-death-message) | |
572 | (progn (beep) | |
573 | (message | |
574 | "The Scheme process has died! Do M-x reset-scheme to restart it")))) | |
575 | ||
576 | (defun xscheme-process-filter-initialize (running-p) | |
577 | (setq xscheme-process-filter-state 'idle) | |
578 | (setq xscheme-running-p running-p) | |
579 | (setq xscheme-control-g-disabled-p nil) | |
580 | (setq xscheme-allow-output-p t) | |
581 | (setq xscheme-prompt "") | |
582 | (setq scheme-mode-line-process '(": " xscheme-runlight-string))) | |
583 | ||
584 | (defun xscheme-process-filter (proc string) | |
585 | (let ((xscheme-filter-input string)) | |
586 | (while xscheme-filter-input | |
587 | (cond ((eq xscheme-process-filter-state 'idle) | |
588 | (let ((start (string-match "\e" xscheme-filter-input))) | |
589 | (if start | |
590 | (progn | |
591 | (xscheme-process-filter-output | |
592 | (substring xscheme-filter-input 0 start)) | |
593 | (setq xscheme-filter-input | |
594 | (substring xscheme-filter-input (1+ start))) | |
595 | (setq xscheme-process-filter-state 'reading-type)) | |
596 | (let ((string xscheme-filter-input)) | |
597 | (setq xscheme-filter-input nil) | |
598 | (xscheme-process-filter-output string))))) | |
599 | ((eq xscheme-process-filter-state 'reading-type) | |
600 | (if (zerop (length xscheme-filter-input)) | |
601 | (setq xscheme-filter-input nil) | |
602 | (let ((char (aref xscheme-filter-input 0))) | |
603 | (setq xscheme-filter-input | |
604 | (substring xscheme-filter-input 1)) | |
605 | (let ((entry (assoc char xscheme-process-filter-alist))) | |
606 | (if entry | |
607 | (funcall (nth 2 entry) (nth 1 entry)) | |
608 | (progn | |
609 | (xscheme-process-filter-output ?\e char) | |
610 | (setq xscheme-process-filter-state 'idle))))))) | |
611 | ((eq xscheme-process-filter-state 'reading-string) | |
612 | (let ((start (string-match "\e" xscheme-filter-input))) | |
613 | (if start | |
614 | (let ((string | |
615 | (concat xscheme-string-accumulator | |
616 | (substring xscheme-filter-input 0 start)))) | |
617 | (setq xscheme-filter-input | |
618 | (substring xscheme-filter-input (1+ start))) | |
619 | (setq xscheme-process-filter-state 'idle) | |
620 | (funcall xscheme-string-receiver string)) | |
621 | (progn | |
622 | (setq xscheme-string-accumulator | |
623 | (concat xscheme-string-accumulator | |
624 | xscheme-filter-input)) | |
625 | (setq xscheme-filter-input nil))))) | |
626 | (t | |
627 | (error "Scheme process filter -- bad state")))))) | |
628 | \f | |
629 | ;;;; Process Filter Output | |
630 | ||
631 | (defun xscheme-process-filter-output (&rest args) | |
632 | (if xscheme-allow-output-p | |
633 | (let ((string (apply 'concat args))) | |
634 | (save-excursion | |
635 | (xscheme-goto-output-point) | |
636 | (while (string-match "\\(\007\\|\f\\)" string) | |
637 | (let ((start (match-beginning 0)) | |
638 | (end (match-end 0))) | |
639 | (insert-before-markers (substring string 0 start)) | |
640 | (if (= ?\f (aref string start)) | |
641 | (progn | |
642 | (if (not (bolp)) | |
643 | (insert-before-markers ?\n)) | |
644 | (insert-before-markers ?\f)) | |
645 | (beep)) | |
646 | (setq string (substring string (1+ start))))) | |
647 | (insert-before-markers string))))) | |
648 | ||
649 | (defun xscheme-guarantee-newlines (n) | |
650 | (if xscheme-allow-output-p | |
651 | (save-excursion | |
652 | (xscheme-goto-output-point) | |
653 | (let ((stop nil)) | |
654 | (while (and (not stop) | |
655 | (bolp)) | |
656 | (setq n (1- n)) | |
657 | (if (bobp) | |
658 | (setq stop t) | |
659 | (backward-char)))) | |
660 | (xscheme-goto-output-point) | |
661 | (while (> n 0) | |
662 | (insert-before-markers ?\n) | |
663 | (setq n (1- n)))))) | |
664 | ||
665 | (defun xscheme-goto-output-point () | |
666 | (let ((process (get-process "scheme"))) | |
667 | (set-buffer (process-buffer process)) | |
668 | (goto-char (process-mark process)))) | |
669 | ||
670 | (defun xscheme-modeline-initialize () | |
671 | (setq xscheme-runlight-string "") | |
672 | (setq xscheme-mode-string "") | |
673 | (setq mode-line-buffer-identification '("Scheme: " xscheme-mode-string))) | |
674 | ||
675 | (defun xscheme-set-runlight (runlight) | |
676 | (setq xscheme-runlight-string runlight) | |
677 | (xscheme-modeline-redisplay)) | |
678 | ||
679 | (defun xscheme-modeline-redisplay () | |
680 | (save-excursion (set-buffer (other-buffer))) | |
681 | (set-buffer-modified-p (buffer-modified-p)) | |
682 | (sit-for 0)) | |
683 | \f | |
684 | ;;;; Process Filter Operations | |
685 | ||
686 | (defvar xscheme-process-filter-alist | |
687 | '((?D xscheme-enter-debugger-mode | |
688 | xscheme-process-filter:string-action) | |
689 | (?E xscheme-eval | |
690 | xscheme-process-filter:string-action) | |
691 | (?P xscheme-set-prompt-variable | |
692 | xscheme-process-filter:string-action) | |
693 | (?R xscheme-enter-interaction-mode | |
694 | xscheme-process-filter:simple-action) | |
695 | (?b xscheme-start-gc | |
696 | xscheme-process-filter:simple-action) | |
697 | (?e xscheme-finish-gc | |
698 | xscheme-process-filter:simple-action) | |
699 | (?f xscheme-exit-input-wait | |
700 | xscheme-process-filter:simple-action) | |
701 | (?g xscheme-enable-control-g | |
702 | xscheme-process-filter:simple-action) | |
703 | (?i xscheme-prompt-for-expression | |
704 | xscheme-process-filter:string-action) | |
705 | (?m xscheme-message | |
706 | xscheme-process-filter:string-action) | |
707 | (?n xscheme-prompt-for-confirmation | |
708 | xscheme-process-filter:string-action) | |
709 | (?o xscheme-output-goto | |
710 | xscheme-process-filter:simple-action) | |
711 | (?p xscheme-set-prompt | |
712 | xscheme-process-filter:string-action) | |
713 | (?s xscheme-enter-input-wait | |
714 | xscheme-process-filter:simple-action) | |
715 | (?v xscheme-write-value | |
716 | xscheme-process-filter:string-action) | |
717 | (?w xscheme-cd | |
718 | xscheme-process-filter:string-action) | |
719 | (?z xscheme-display-process-buffer | |
720 | xscheme-process-filter:simple-action) | |
721 | (?c xscheme-unsolicited-read-char | |
722 | xscheme-process-filter:simple-action)) | |
723 | "Table used to decide how to handle process filter commands. | |
724 | Value is a list of entries, each entry is a list of three items. | |
725 | ||
726 | The first item is the character that the process filter dispatches on. | |
727 | The second item is the action to be taken, a function. | |
728 | The third item is the handler for the entry, a function. | |
729 | ||
730 | When the process filter sees a command whose character matches a | |
731 | particular entry, it calls the handler with two arguments: the action | |
732 | and the string containing the rest of the process filter's input | |
733 | stream. It is the responsibility of the handler to invoke the action | |
734 | with the appropriate arguments, and to reenter the process filter with | |
735 | the remaining input.") | |
736 | \f | |
737 | (defun xscheme-process-filter:simple-action (action) | |
738 | (setq xscheme-process-filter-state 'idle) | |
739 | (funcall action)) | |
740 | ||
741 | (defun xscheme-process-filter:string-action (action) | |
742 | (setq xscheme-string-receiver action) | |
743 | (setq xscheme-string-accumulator "") | |
744 | (setq xscheme-process-filter-state 'reading-string)) | |
745 | ||
746 | (defconst xscheme-runlight:running "run" | |
747 | "The character displayed when the Scheme process is running.") | |
748 | ||
749 | (defconst xscheme-runlight:input "input" | |
750 | "The character displayed when the Scheme process is waiting for input.") | |
751 | ||
752 | (defconst xscheme-runlight:gc "gc" | |
753 | "The character displayed when the Scheme process is garbage collecting.") | |
754 | ||
755 | (defun xscheme-start-gc () | |
756 | (xscheme-set-runlight xscheme-runlight:gc)) | |
757 | ||
758 | (defun xscheme-finish-gc () | |
759 | (xscheme-set-runlight | |
760 | (if xscheme-running-p xscheme-runlight:running xscheme-runlight:input))) | |
761 | ||
762 | (defun xscheme-enter-input-wait () | |
763 | (xscheme-set-runlight xscheme-runlight:input) | |
764 | (setq xscheme-running-p nil)) | |
765 | ||
766 | (defun xscheme-exit-input-wait () | |
767 | (xscheme-set-runlight xscheme-runlight:running) | |
768 | (setq xscheme-running-p t)) | |
769 | ||
770 | (defun xscheme-enable-control-g () | |
771 | (setq xscheme-control-g-disabled-p nil)) | |
772 | ||
773 | (defun xscheme-display-process-buffer () | |
774 | (let ((window (or (xscheme-process-buffer-window) | |
775 | (display-buffer (xscheme-process-buffer))))) | |
776 | (save-window-excursion | |
777 | (select-window window) | |
778 | (xscheme-goto-output-point) | |
779 | (if (xscheme-debugger-mode-p) | |
780 | (xscheme-enter-interaction-mode))))) | |
781 | ||
782 | (defun xscheme-unsolicited-read-char () | |
783 | nil) | |
784 | \f | |
785 | (defun xscheme-eval (string) | |
786 | (eval (car (read-from-string string)))) | |
787 | ||
788 | (defun xscheme-message (string) | |
789 | (if (not (zerop (length string))) | |
790 | (xscheme-write-message-1 string (format ";%s" string)))) | |
791 | ||
792 | (defun xscheme-write-value (string) | |
793 | (if (zerop (length string)) | |
794 | (xscheme-write-message-1 "(no value)" ";No value") | |
795 | (xscheme-write-message-1 string (format ";Value: %s" string)))) | |
796 | ||
797 | (defun xscheme-write-message-1 (message-string output-string) | |
798 | (let* ((process (get-process "scheme")) | |
799 | (window (get-buffer-window (process-buffer process)))) | |
800 | (if (or (not window) | |
801 | (not (pos-visible-in-window-p (process-mark process) | |
802 | window))) | |
803 | (message "%s" message-string))) | |
804 | (xscheme-guarantee-newlines 1) | |
805 | (xscheme-process-filter-output output-string)) | |
806 | ||
807 | (defun xscheme-set-prompt-variable (string) | |
808 | (setq xscheme-prompt string)) | |
809 | ||
810 | (defun xscheme-set-prompt (string) | |
811 | (setq xscheme-prompt string) | |
812 | (xscheme-guarantee-newlines 2) | |
813 | (setq xscheme-mode-string (xscheme-coerce-prompt string)) | |
814 | (xscheme-modeline-redisplay)) | |
815 | ||
816 | (defun xscheme-output-goto () | |
817 | (xscheme-goto-output-point) | |
818 | (xscheme-guarantee-newlines 2)) | |
819 | ||
820 | (defun xscheme-coerce-prompt (string) | |
821 | (if (string-match "^[0-9]+ " string) | |
822 | (let ((end (match-end 0))) | |
823 | (concat (substring string 0 end) | |
824 | (let ((prompt (substring string end))) | |
825 | (let ((entry (assoc prompt xscheme-prompt-alist))) | |
826 | (if entry | |
827 | (cdr entry) | |
828 | prompt))))) | |
829 | string)) | |
830 | ||
831 | (defvar xscheme-prompt-alist | |
832 | '(("[Normal REPL]" . "[Evaluator]") | |
833 | ("[Error REPL]" . "[Evaluator]") | |
834 | ("[Breakpoint REPL]" . "[Evaluator]") | |
835 | ("[Debugger REPL]" . "[Evaluator]") | |
836 | ("[Visiting environment]" . "[Evaluator]") | |
837 | ("[Environment Inspector]" . "[Where]")) | |
838 | "An alist which maps the Scheme command interpreter type to a print string.") | |
839 | ||
840 | (defun xscheme-cd (directory-string) | |
841 | (save-excursion | |
842 | (set-buffer (xscheme-process-buffer)) | |
843 | (cd directory-string))) | |
844 | \f | |
845 | (defun xscheme-prompt-for-confirmation (prompt-string) | |
846 | (xscheme-send-char (if (y-or-n-p prompt-string) ?y ?n))) | |
847 | ||
848 | (defun xscheme-prompt-for-expression (prompt-string) | |
849 | (xscheme-send-string-2 | |
850 | (read-from-minibuffer prompt-string nil xscheme-prompt-for-expression-map))) | |
851 | ||
852 | (defvar xscheme-prompt-for-expression-map nil) | |
853 | (if (not xscheme-prompt-for-expression-map) | |
854 | (progn | |
855 | (setq xscheme-prompt-for-expression-map | |
856 | (copy-keymap minibuffer-local-map)) | |
857 | (substitute-key-definition 'exit-minibuffer | |
858 | 'xscheme-prompt-for-expression-exit | |
859 | xscheme-prompt-for-expression-map))) | |
860 | ||
861 | (defun xscheme-prompt-for-expression-exit () | |
862 | (interactive) | |
863 | (if (eq (xscheme-region-expression-p (point-min) (point-max)) 'one) | |
864 | (exit-minibuffer) | |
865 | (error "input must be a single, complete expression"))) | |
866 | ||
867 | (defun xscheme-region-expression-p (start end) | |
868 | (save-excursion | |
869 | (let ((old-syntax-table (syntax-table))) | |
870 | (unwind-protect | |
871 | (progn | |
872 | (set-syntax-table scheme-mode-syntax-table) | |
873 | (let ((state (parse-partial-sexp start end))) | |
874 | (and (zerop (car state)) ;depth = 0 | |
875 | (nth 2 state) ;last-sexp exists, i.e. >= 1 sexps | |
876 | (let ((state (parse-partial-sexp start (nth 2 state)))) | |
877 | (if (nth 2 state) 'many 'one))))) | |
878 | (set-syntax-table old-syntax-table))))) | |
76d7458e | 879 | |
ff383ac0 RS |
880 | (provide 'xscheme) |
881 | ||
76d7458e | 882 | ;;; xscheme.el ends here |