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#lang br/quicklang
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(provide (rename-out [b-module-begin #%module-begin])
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(matching-identifiers-out #rx"^b-" (all-defined-out)))
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(define-macro (b-module-begin (b-program LINE ...))
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(with-pattern
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([(LINE-NUM ...)
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(filter-stx-prop 'b-line-num
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(stx-flatten #'(LINE ...)))]
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[(LINE-ID ...) (prefix-ids "line-" #'(LINE-NUM ...))])
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#'(#%module-begin
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LINE ...
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(define line-table
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(apply hasheqv (append (list LINE-NUM LINE-ID) ...)))
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(run line-table))))
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(define-macro (b-line LINE-NUMBER STATEMENT ...)
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(with-pattern
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([LINE-NUMBER-ID (prefix-id "line-" #'LINE-NUMBER
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#:source #'LINE-NUMBER)]
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[ORIG-LOC caller-stx])
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(syntax/loc caller-stx
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(define (LINE-NUMBER-ID #:srcloc? [loc #f])
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(if loc
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(syntax-srcloc #'ORIG-LOC)
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(begin (void) STATEMENT ...))))))
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(define b-rem void)
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(define (b-print [val ""]) (displayln val))
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(define (b-sum . nums) (apply + nums))
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(define (b-num-expr expr)
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(if (integer? expr) (inexact->exact expr) expr))
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(struct $program-end-signal ())
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(define (b-end) (raise ($program-end-signal)))
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(struct $change-line-signal (val))
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(define (b-goto expr) (raise ($change-line-signal expr)))
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(define-exn line-not-found exn:fail)
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(define (run line-table)
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(define line-vec
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(list->vector (sort (hash-keys line-table) <)))
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(with-handlers ([$program-end-signal? void])
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(for/fold ([line-idx 0])
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([i (in-naturals)])
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(unless (< line-idx (vector-length line-vec)) (b-end))
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(define line-num (vector-ref line-vec line-idx))
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(define line-proc (hash-ref line-table line-num))
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(with-handlers
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([$change-line-signal?
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(λ (cls)
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(define clsv ($change-line-signal-val cls))
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(or
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(and (exact-positive-integer? clsv)
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(vector-member clsv line-vec))
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(raise-line-not-found
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(line-proc #:srcloc? #t))))])
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(line-proc)
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(add1 line-idx)))))
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