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;;; I'm trying to write an interpreter for a BBC BASIC subset
;;; initially following the design of
;;; https://caml.inria.fr/pub/docs/oreilly-book/html/book-ora058.html
;;; and later I can Frankenstein it with
;;; https://github.com/Henry/BuddKaminInterpreters
(load "cutil.lisp")
(load "cparse.lisp")
(require "cparse")
(require "")
(defpackage #:cbasic
(:use #:common-lisp)
(:export
#:main))
(in-package #:cbasic)
;;; Not sure if it's a good idea,
;;; but try to keep the number of top-level functions the same as in OCaml.
(defun one-command (st)
(format (standard-output) "> ")
(with-handler #'error-handler
(let ((l (parse (read-line))))
(case (car l)
((line) (insert (cadr c)))
((p-end) (throw 'end nil)))))) ; throw and conditions are orthogonal
(defclass <state> () ((program :accessor program)
(env :accessor env)))
(defmethod initialize-object :after ((self <state>) initargs)
(setf (program self) nil)
(setf (env self) nil))
(defun main ()
(catch 'end (lambda ()
(format (standard-output) "BASIC version 0.1~%~%")
(for ((st (create (class <state>))))
(catch 'error (one-command st)))))
(format (standard-output) "See you later...~%"))
(provide "cbasic")
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