56 lines
1.1 KiB
Common Lisp
56 lines
1.1 KiB
Common Lisp
;;;; cl-scopes/forge - may the forge be with you!
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;;;; A Forth-like interpreter implemented in Common Lisp.
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(defpackage :scopes/forge/sf
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(:use :common-lisp)
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(:local-nicknames (:iter :scopes/util/iter))
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(:export #:*input* #:*stack*
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#:proc-list #:proc-input
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#:add #:mul #:dup
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#:pushd #:popd #:peekd))
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(defpackage :sf-builtin)
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(defpackage :sf-user)
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(in-package :scopes/forge/sf)
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(defvar *stack* nil)
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(defvar *input* nil)
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;;;; core definitions
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(defun proc-list (lst)
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(setf *input* (make-instance 'iter:list-iterator :data lst))
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(proc-input))
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(defun proc-input ()
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(let ((inp *input*))
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(do ((end (iter:next inp) (iter:next inp)))
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(end)
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(proc-item (iter:value inp)))))
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(defun proc-item (item)
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(typecase item
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(symbol (funcall item))
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(t (pushd item))))
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(defun reg2 (sym fn)
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(setf (fdefinition sym)
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#'(lambda () (pushd (funcall fn (popd) (popd))))))
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(defun pushd (v)
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(push v *stack*))
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(defun popd ()
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(pop *stack*))
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(defun peekd ()
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(car *stack*))
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;;;; builtins
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(reg2 'add #'+)
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(reg2 'mul #'*)
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(defun dup () (pushd (peekd)))
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