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24 lines
717 B
Racket
24 lines
717 B
Racket
#lang br
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(require "struct.rkt" "expr.rkt")
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(provide b-rem b-print b-let b-input b-repl b-import)
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(define (b-rem val) (void))
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(define (b-print . vals)
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(displayln (string-append* (map ~a vals))))
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(define-macro (b-let ID VAL) #'(set! ID VAL))
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(define-macro (b-input ID)
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#'(b-let ID (let* ([str (read-line)]
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[num (string->number (string-trim str))])
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(or num str))))
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(define-macro (b-repl . ARGS)
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(with-pattern ([STMTS (pattern-case-filter #'ARGS
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[(b-expr . EXPR-ARGS)
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#'(b-print (b-expr . EXPR-ARGS))]
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[OTHER-STMT #'OTHER-STMT])])
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#'(begin . STMTS)))
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(define-macro (b-import VAL) #'(void)) |