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|
(declare (usual-integrations write write-line pp eval))
(define write
(make-generic-operator 1
(access write user-initial-environment)))
(define write-line
(make-generic-operator 1
(access write-line user-initial-environment)))
(define pp
(make-generic-operator 1
(access pp user-initial-environment)))
(define (procedure-printable-representation procedure)
`(compound-procedure
,(procedure-parameters procedure)
,(procedure-body procedure)
<procedure-environment>))
(defhandler write
(compose write procedure-printable-representation)
compound-procedure?)
(defhandler write-line
(compose write-line procedure-printable-representation)
compound-procedure?)
(defhandler pp
(compose pp procedure-printable-representation)
compound-procedure?)
(define (read) (prompt-for-command-expression "eval> "))
(define the-global-environment)
(define (init)
(set! the-global-environment
(extend-environment '() '() the-empty-environment))
(repl))
(define (repl)
(let ((input (read)))
(write-line (eval input the-global-environment))
(repl)))
(define go repl)
|
