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fd4aa4fae6
Finally handle EOF correctly and do not exit REPL if an expression evaluates to the EOF object. However, allow CTRL-d to exit the REPL.
58 lines
1.6 KiB
Scheme
58 lines
1.6 KiB
Scheme
;;;; Cyclone Scheme
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;;;; https://github.com/justinethier/cyclone
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;;;;
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;;;; Copyright (c) 2014-2016, Justin Ethier
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;;;; All rights reserved.
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;;;;
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;;;; This module contains the repl library from r7rs.
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;;;;
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(define-library (scheme repl)
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(export
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interaction-environment
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repl)
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(import (scheme base)
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(scheme eval)
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(scheme read)
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(scheme write))
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(begin
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(define (interaction-environment)
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(setup-environment))
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(define (repl)
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(with-handler
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(lambda (obj)
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(display "Error: ")
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(cond
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((error-object? obj)
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(display (error-object-message obj))
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(if (not (null? (error-object-irritants obj)))
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(display ": "))
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(for-each
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(lambda (o)
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(write o)
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(display " "))
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(error-object-irritants obj)))
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((pair? obj)
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(when (string? (car obj))
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(display (car obj))
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(if (not (null? (cdr obj)))
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(display ": "))
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(set! obj (cdr obj)))
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(for-each
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(lambda (o)
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(write o)
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(display " "))
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obj))
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(else
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(display obj)))
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(newline)
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(repl))
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(display "cyclone> ")
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(let ((obj (read)))
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(if (eof-object? obj)
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(newline) ;; Quick way to exit REPL
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(let ((c (eval obj)))
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(if (eof-object? c)
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(display "<EOF>")
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(write c))
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(newline)
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(repl))))))))
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