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#lang br/quicklang
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(require "struct.rkt"
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"elements.rkt")
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(provide (rename-out [b-module-begin #%module-begin])
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(all-from-out "elements.rkt"))
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(define-macro (b-module-begin (b-program LINE ...))
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(with-pattern
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([((b-line NUM STMT ...) ...) #'(LINE ...)]
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[(LINE-FUNC ...) (prefix-id "line-" #'(NUM ...))]
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[(VAR-NAME ...) (find-unique-var-names #'(LINE ...))])
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#'(#%module-begin
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(define VAR-NAME 0) ...
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LINE ...
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(define line-table
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(apply hasheqv (append (list NUM LINE-FUNC) ...)))
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(void (run line-table)))))
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(begin-for-syntax
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(require racket/list)
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(define (find-unique-var-names stx)
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(remove-duplicates
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(for/list ([var-stx (in-list (syntax-flatten stx))]
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#:when (syntax-property var-stx 'b-id))
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var-stx)
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#:key syntax->datum)))
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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 ([end-program-signal? (λ (exn-val) (void))])
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(for/fold ([line-idx 0])
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([i (in-naturals)]
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#:break (>= line-idx (vector-length line-vec)))
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(define line-num (vector-ref line-vec line-idx))
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(define line-func (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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(line-func #:error (format "line ~a not found" clsv))))])
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(line-func)
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(add1 line-idx)))))
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