module/system/repl/common.scm

   1 ;;; Repl common routines
   2
   3 ;; Copyright (C) 2001 Free Software Foundation, Inc.
   4
   5 ;; This program is free software; you can redistribute it and/or modify
   6 ;; it under the terms of the GNU General Public License as published by
   7 ;; the Free Software Foundation; either version 2, or (at your option)
   8 ;; any later version.
   9 ;;
  10 ;; This program is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;; GNU General Public License for more details.
  14 ;;
  15 ;; You should have received a copy of the GNU General Public License
  16 ;; along with this program; see the file COPYING.  If not, write to
  17 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 ;; Boston, MA 02111-1307, USA.
  19
  20 ;;; Code:
  21
  22 (define-module (system repl common)
  23   #:use-syntax (system base syntax)
  24   #:use-module (system base compile)
  25   #:use-module (system base language)
  26   #:use-module (system vm vm)
  27   #:export (<repl> make-repl repl-vm repl-language repl-options
  28                   repl-tm-stats repl-gc-stats repl-vm-stats
  29            repl-welcome repl-prompt repl-read repl-compile repl-eval
  30            repl-print repl-option-ref repl-option-set!
  31            puts ->string user-error))
  32
  33 \f
  34 ;;;
  35 ;;; Repl type
  36 ;;;
  37
  38 (define-record (<repl> vm language options tm-stats gc-stats vm-stats))
  39
  40 (define repl-default-options
  41   '((trace . #f)
  42     (interp . #f)))
  43
  44 (define %make-repl make-repl)
  45 (define (make-repl lang)
  46   (%make-repl #:vm (the-vm)
  47               #:language (lookup-language lang)
  48               #:options repl-default-options
  49               #:tm-stats (times)
  50               #:gc-stats (gc-stats)
  51               #:vm-stats (vm-stats (the-vm))))
  52
  53 (define (repl-welcome repl)
  54   (let ((language (repl-language repl)))
  55     (format #t "~A interpreter ~A on Guile ~A\n"
  56             (language-title language) (language-version language) (version)))
  57   (display "Copyright (C) 2001-2008 Free Software Foundation, Inc.\n\n")
  58   (display "Enter `,help' for help.\n"))
  59
  60 (define (repl-prompt repl)
  61   (format #f "~A@~A> " (language-name (repl-language repl))
  62           (module-name (current-module))))
  63
  64 (define (repl-read repl)
  65   ((language-reader (repl-language repl))))
  66
  67 (define (repl-compile repl form . opts)
  68   (apply compile-in form (current-module) (repl-language repl) opts))
  69
  70 (define (repl-eval repl form)
  71   (let ((eval (language-evaluator (repl-language repl))))
  72     (if (and eval
  73              (or (not (language-translator (repl-language repl)))
  74                  (assq-ref (repl-options repl) 'interp)))
  75         (eval form (current-module))
  76         (vm-load (repl-vm repl) (repl-compile repl form)))))
  77
  78 (define (repl-print repl val)
  79   (if (not (eq? val *unspecified*))
  80       (begin
  81         ((language-printer (repl-language repl)) val)
  82         (newline))))
  83
  84 (define (repl-option-ref repl key)
  85   (assq-ref (repl-options repl) key))
  86
  87 (define (repl-option-set! repl key val)
  88   (set! (repl-options repl) (assq-set! (repl-options repl) key val)))
  89
  90 \f
  91 ;;;
  92 ;;; Utilities
  93 ;;;
  94
  95 (define (puts x) (display x) (newline))
  96
  97 (define (->string x)
  98   (object->string x display))
  99
 100 (define (user-error msg . args)
 101   (throw 'user-error #f msg args #f))