49 lines
1.4 KiB
Scheme
49 lines
1.4 KiB
Scheme
(define-library (picrin repl)
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(import (scheme base)
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(scheme read)
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(scheme write)
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(scheme eval)
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(picrin macro)
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(picrin library))
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(define-syntax define-readline
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(er-macro-transformer
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(lambda (form rename compare)
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(if (member '(picrin readline) (libraries))
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`(import (picrin readline)
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(picrin readline history))
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`(begin
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(define (readline str)
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(display str)
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(read-line))
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(define (add-history str)
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#f))))))
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(define-readline)
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(define (repl)
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(let ((line (readline "> ")))
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(if (eof-object? line)
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(newline) ; exit
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(begin
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(add-history line)
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(call/cc
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(lambda (exit)
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(with-exception-handler
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(lambda (condition)
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(display (error-object-message condition) (current-error-port))
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(newline)
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(exit))
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(lambda ()
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(let ((port (open-input-string line)))
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(let loop ((expr (read port)))
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(unless (eof-object? expr)
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(write (eval expr '(picrin user)))
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(newline)
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(loop (read port))))
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(close-port port))))))
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(repl)))))
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(export repl))
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