39 lines
1.1 KiB
Scheme
39 lines
1.1 KiB
Scheme
(define-record-type :rule
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(really-make-rule prereqs wants-build? build-func)
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is-rule?
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(prereqs rule-prereqs)
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(wants-build? rule-wants-build?)
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(build-func rule-build-func))
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(define rules (list))
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(define lock-rules (make-lock))
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(define (rule-make rule init-state)
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(let* ((res-pres (map (lambda (prereq)
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(rule-make prereq init-state))
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(rule-prereqs rule)))
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(res-wants-build? (call-with-values
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(lambda ()
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(apply values (append res-pres
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(list init-state))))
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(rule-wants-build? rule)))
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(build? (car res-wants-build?))
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(cooked-state (cdr res-wants-build?)))
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(if build?
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(call-with-values
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(lambda ()
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(apply values (append (list build?)
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res-pres
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(list cooked-state))))
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(rule-build-func rule))
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res-wants-build?)))
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(define (make-rule prereqs wants-build? build-func)
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(let ((rule (really-make-rule prereqs wants-build? build-func)))
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(with-lock lock-rules
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(lambda ()
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(if (not (find (lambda (r) (eq? r rule)) rules))
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(set! rules (cons rule rules))
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(error "make-rule: rule already exists."))))
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rule))
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