152 lines
4.9 KiB
Scheme
152 lines
4.9 KiB
Scheme
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(library (ikarus library-manager)
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(export imported-label->binding library-subst
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installed-libraries visit-library
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find-library-by-name install-library
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library-spec invoke-library)
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(import (except (ikarus) installed-libraries))
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(define (make-collection)
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(let ([set '()])
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(define (set-cons x ls)
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(cond
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[(memq x ls) ls]
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[else (cons x ls)]))
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(case-lambda
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[() set]
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[(x) (set! set (set-cons x set))])))
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(define current-library-collection
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;;; this works now because make-collection is a lambda
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;;; binding and this turns into a complex binding as far
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;;; as letrec is concerned. It will be more ok once we do
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;;; letrec*.
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(make-parameter (make-collection)
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(lambda (x)
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(unless (procedure? x)
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(error 'current-library-collection "~s is not a procedure" x))
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x)))
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(define-record library
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(id name ver imp* vis* inv* subst env visit-state invoke-state
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visible?))
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(define (find-dependencies ls)
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(cond
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[(null? ls) '()]
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[else (error 'find-dependencies "cannot handle deps yet")]))
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(define (find-library-by pred)
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(let f ([ls ((current-library-collection))])
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(cond
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[(null? ls) #f]
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[(pred (car ls)) (car ls)]
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[else (f (cdr ls))])))
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(define (install-library-by-name name)
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#f)
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(define (find-library-by-name name)
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(find-library-by
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(lambda (x) (equal? (library-name x) name))))
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(define (library-exists? name)
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(and (find-library-by
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(lambda (x) (equal? (library-name x) name)))
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#t))
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(define (find-library-by-spec/die spec)
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(let ([id (car spec)])
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(or (find-library-by
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(lambda (x) (eq? id (library-id x))))
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(error #f "cannot find library with spec ~s" spec))))
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(define label->binding-table (make-hash-table))
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(define (install-library id name ver imp* vis* inv*
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exp-subst exp-env visit-code invoke-code visible?)
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(let ([imp-lib* (map find-library-by-spec/die imp*)]
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[vis-lib* (map find-library-by-spec/die vis*)]
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[inv-lib* (map find-library-by-spec/die inv*)])
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(unless (and (symbol? id) (list? name) (list? ver))
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(error 'install-library "invalid spec ~s ~s ~s" id name ver))
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(when (library-exists? name)
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(error 'install-library "~s is already installed" name))
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(let ([lib (make-library id name ver imp-lib* vis-lib* inv-lib*
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exp-subst exp-env visit-code invoke-code
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visible?)])
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(for-each
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(lambda (x)
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(let ([label (car x)] [binding (cdr x)])
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(let ([binding
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(case (car binding)
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[(global)
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(cons 'global (cons lib (cdr binding)))]
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[(global-macro)
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(cons 'global-macro (cons lib (cdr binding)))]
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[else binding])])
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(put-hash-table! label->binding-table label binding))))
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exp-env)
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((current-library-collection) lib))))
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(define (imported-label->binding lab)
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(get-hash-table label->binding-table lab #f))
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(define (invoke-library lib)
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(let ([invoke (library-invoke-state lib)])
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(when (procedure? invoke)
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(set-library-invoke-state! lib
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(lambda () (error 'invoke "circularity detected for ~s" lib)))
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(for-each invoke-library (library-inv* lib))
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(set-library-invoke-state! lib
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(lambda () (error 'invoke "first invoke did not return for ~s" lib)))
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(invoke)
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(set-library-invoke-state! lib #t))))
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(define (visit-library lib)
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(let ([visit (library-visit-state lib)])
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(when (procedure? visit)
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(set-library-visit-state! lib
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(lambda () (error 'visit "circularity detected for ~s" lib)))
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(for-each invoke-library (library-vis* lib))
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(set-library-visit-state! lib
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(lambda () (error 'invoke "first visit did not return for ~s" lib)))
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(visit)
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(set-library-visit-state! lib #t))))
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(define (invoke-library-by-spec spec)
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(invoke-library (find-library-by-spec/die spec)))
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(define installed-libraries
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(case-lambda
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[(all?)
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(let f ([ls ((current-library-collection))])
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(cond
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[(null? ls) '()]
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[(or all? (library-visible? (car ls)))
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(cons (car ls) (f (cdr ls)))]
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[else (f (cdr ls))]))]
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[() (installed-libraries #f)]))
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(define library-spec
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(lambda (x)
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(unless (library? x)
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(error 'library-spec "~s is not a library" x))
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(list (library-id x) (library-name x) (library-ver x))))
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;;; init
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(set-rtd-printer! (type-descriptor library)
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(lambda (x p)
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(unless (library? x)
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(error 'record-type-printer "not a library"))
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(display
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(format "#<library ~s>" (append (library-name x) (library-ver x)))
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p)))
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)
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