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40 lines
1.2 KiB
Scheme
40 lines
1.2 KiB
Scheme
;; Copyright (C) 2015
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;; "Mu Lei" known as "NalaGinrut" <NalaGinrut@gmail.com>
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;; This file 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 3 of the License, or
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;; (at your option) any later version.
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;; This file 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 this program. If not, see <http://www.gnu.org/licenses/>.
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(import (readline) (reader) (printer))
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(define (READ)
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(read_str (_readline "user> ")))
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(define (EVAL ast env) ast)
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(define (PRINT exp)
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(and (not (eof-object? exp))
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(format #t "~a~%" (pr_str exp #t))))
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(define (LOOP continue?)
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(and continue? (REPL)))
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(define (REPL)
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(LOOP
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(catch 'mal-error
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(lambda () (PRINT (EVAL (READ) '())))
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(lambda (k . e)
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(if (string=? (car e) "blank line")
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(display "")
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(format #t "Error: ~a~%" (car e)))))))
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(REPL)
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