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#lang br/quicklang
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(define-exn-srcloc duplicate-line-number exn:fail)
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(define-macro (b-module-begin (b-program LINE ...))
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#'(#%module-begin
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(define lines (sort (list LINE ...) #:key $line-number <))
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(unless (apply < (map $line-number lines))
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(raise-duplicate-line-number
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($line-srcloc (check-duplicates lines = #:key $line-number))))
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(run lines)))
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(provide (rename-out [b-module-begin #%module-begin]))
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(struct $line (number thunk srcloc) #:transparent)
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(define-macro (b-line LINE-NUMBER STATEMENT)
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(with-pattern ([CALLER-STX caller-stx])
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#'($line LINE-NUMBER (λ () STATEMENT) (syntax-srcloc #'CALLER-STX))))
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(define (b-statement stmt) stmt)
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(define (b-rem str) #f)
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(define (b-print str) (displayln str))
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(define (b-goto line-number) line-number)
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(define-exn end-program-signal exn:fail)
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(define (b-end) (raise-end-program-signal))
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(provide b-line b-statement b-rem b-print b-goto b-end)
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(define-exn-srcloc line-not-found exn:fail)
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(define (run lines)
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(define line-vec (list->vector lines))
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(define line-idx-table (for/hasheqv ([(line idx) (in-indexed line-vec)])
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(values ($line-number line) idx)))
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(with-handlers ([end-program-signal? void])
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(for/fold ([line-idx 0])
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([i (in-naturals)])
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(unless (< line-idx (vector-length line-vec)) (b-end))
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(define this-line (vector-ref line-vec line-idx))
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(define this-thunk ($line-thunk this-line))
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(define this-result (this-thunk))
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(if (exact-positive-integer? this-result)
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(hash-ref line-idx-table this-result
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(λ () (raise-line-not-found ($line-srcloc this-line))))
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(add1 line-idx)))))
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