mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 03:40:34 +02:00
69 lines
2 KiB
Scheme
69 lines
2 KiB
Scheme
;;; Read-Eval-Print Loop
|
|
|
|
;; Copyright (C) 2001 Free Software Foundation, Inc.
|
|
|
|
;; This program is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 2, or (at your option)
|
|
;; any later version.
|
|
;;
|
|
;; This program is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
;;
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with this program; see the file COPYING. If not, write to
|
|
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Code:
|
|
|
|
(define-module (system repl repl)
|
|
:use-syntax (system base syntax)
|
|
:use-module (system repl common)
|
|
:use-module (system repl command)
|
|
:use-module (ice-9 rdelim)
|
|
:export (start-repl))
|
|
|
|
(define (start-repl lang)
|
|
(let ((repl (make-repl lang)))
|
|
(repl-welcome repl)
|
|
(let prompt-loop ()
|
|
(repl-prompt repl)
|
|
(call-with-error-handlers
|
|
(lambda ()
|
|
(if (eq? (next-char #t) #\,)
|
|
;; meta command
|
|
(begin (read-char) (meta-command repl (read-line)))
|
|
;; evaluation
|
|
(let rep-loop ()
|
|
(repl-print repl (repl-eval repl (repl-read repl)))
|
|
(if (next-char #f) (rep-loop))))))
|
|
(prompt-loop))))
|
|
|
|
(define (next-char wait)
|
|
(if (or wait (char-ready?))
|
|
(let ((ch (peek-char)))
|
|
(cond ((eof-object? ch) (throw 'quit))
|
|
((char-whitespace? ch) (read-char) (next-char wait))
|
|
(else ch)))
|
|
#f))
|
|
|
|
;;;
|
|
;;; Error handler
|
|
;;;
|
|
|
|
(define (call-with-error-handlers thunk)
|
|
(catch 'vm-error
|
|
(lambda () (catch 'user-error thunk error-handler))
|
|
error-handler))
|
|
|
|
(define (error-handler key . args)
|
|
;; (case key
|
|
;; ((vm-error)
|
|
;; (write (frame->call (cadddr args)))
|
|
;; (newline)))
|
|
(display "ERROR: ")
|
|
(apply format #t (cadr args) (caddr args))
|
|
(newline))
|