66 lines
2.1 KiB
Scheme
66 lines
2.1 KiB
Scheme
(define-record-type :rule
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(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-record-type :rule-set
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(make-rule-set rules)
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is-rule-set?
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(rules rule-set-rules))
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(define (make-empty-rule-set)
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(make-rule-set '()))
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;;; listen-ch is a dummy here
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;;; now this and the one in make-rule.scm
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;;; are almost the same functions
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(define (rule-set-add rule rule-set)
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(let ((listen-ch #f))
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(if (not (assq rule (rule-set-rules rule-set)))
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(make-rule-set (alist-cons rule listen-ch (rule-set-rules rule-set)))
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(error "make-rule: rule already exists."))))
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;;;
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;;; RULE-RESULT
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;;;
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;;; (rule-result-wants-build? rule-result) --->
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;;; (wants-build?-result . cooked-state) oder (#f . cooked-state)
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;;;
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;;; (rule-result-build-func rule-result) --->
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;;; (build-func-result . end-state) oder #f
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;;;
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;;; (rule-make rule init-state rule-set) ---> rule-result
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;;;
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(define-record-type :rule-result
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(make-rule-result wants-build?-result build-func-result)
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is-rule-result?
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(wants-build?-result rule-result-wants-build?)
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(build-func-result rule-result-build-func))
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(define (rule-make rule init-state rule-set)
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(let* ((pre-results (map (lambda (prereq)
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(if (assq prereq (rule-set-rules rule-set))
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(rule-make prereq init-state rule-set)
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(error "prerequisite is not in rule-set!")))
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(rule-prereqs rule)))
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(wants-build?-result (if (null? prereqs-results)
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((rule-wants-build? rule) init-state)
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(apply (rule-wants-build? rule)
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(append prereqs-results
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(list init-state)))))
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(build-required? (car wants-build?-result))
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(cooked-state (cdr wants-build?-result)))
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(if build-required?
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(if (null? prereqs-results)
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(make-rule-result wants-build?-result
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((rule-build-func rule)
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build-required? cooked-state))
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(make-rule-result wants-build?-result
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(apply (rule-build-func rule)
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(append (list build-required?)
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prereqs-results
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(list cooked-state)))))
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(make-rule-result wants-build?-result #f))))
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