ikarus/src/ikarus.library-manager.ss

262 lines
8.5 KiB
Scheme

(library (ikarus library-manager)
(export imported-label->binding library-subst
installed-libraries visit-library
library-name
find-library-by-name install-library
library-spec invoke-library
extend-library-subst! extend-library-env!
current-library-expander current-library-collection)
(import (except (ikarus) installed-libraries))
(define (make-collection)
(let ([set '()])
(define (set-cons x ls)
(cond
[(memq x ls) ls]
[else (cons x ls)]))
(case-lambda
[() set]
[(x) (set! set (set-cons x set))])))
(define current-library-collection
;;; this works now because make-collection is a lambda
;;; binding and this turns into a complex binding as far
;;; as letrec is concerned. It will be more ok once we do
;;; letrec*.
(make-parameter (make-collection)
(lambda (x)
(unless (procedure? x)
(error 'current-library-collection "~s is not a procedure" x))
x)))
(define-record library
(id name ver imp* vis* inv* subst env visit-state invoke-state
visible?))
(define (find-dependencies ls)
(cond
[(null? ls) '()]
[else (error 'find-dependencies "cannot handle deps yet")]))
(define (find-library-by pred)
(let f ([ls ((current-library-collection))])
(cond
[(null? ls) #f]
[(pred (car ls)) (car ls)]
[else (f (cdr ls))])))
(define library-path
(make-parameter
'(".")
(lambda (x)
(if (and (list? x) (andmap string? x))
(map values x)
(error 'library-path "~s is not a list of strings" x)))))
(define (library-name->file-name x)
(with-output-to-string
(lambda ()
(define (display-hex n)
(cond
[(<= 0 n 9) (display n)]
[else (display
(integer->char
(+ (char->integer #\A)
(- n 10))))]))
(let f ([ls x])
(cond
[(null? ls) (display ".ss")]
[else
(display "/")
(for-each
(lambda (c)
(cond
[(or (char<=? #\a c #\z)
(char<=? #\A c #\Z)
(char<=? #\0 c #\9)
(memv c '(#\- #\. #\_ #\~)))
(display c)]
[else
(display "%")
(let ([n (char->integer c)])
(display-hex (quotient n 16))
(display-hex (remainder n 16)))]))
(string->list
(symbol->string (car ls))))
(f (cdr ls))])))))
(define file-locator
(make-parameter
(lambda (x)
(let ([str (library-name->file-name x)])
(let f ([ls (library-path)])
(and (pair? ls)
(let ([name (string-append (car ls) str)])
(if (file-exists? name)
name
(f (cdr ls))))))))
(lambda (f)
(if (procedure? f)
f
(error 'file-locator
"~s is not a procedure" f)))))
(define library-locator
(make-parameter
(lambda (x)
(let ([file-name ((file-locator) x)])
(and (string? file-name)
(with-input-from-file file-name read))))
(lambda (f)
(if (procedure? f)
f
(error 'library-locator
"~s is not a procedure" f)))))
(define current-library-expander
(make-parameter
(lambda (x)
(error 'library-expander "not initialized"))
(lambda (f)
(if (procedure? f)
f
(error 'library-expander
"~s is not a procedure" f)))))
(define external-pending-libraries
(make-parameter '()))
(define (find-external-library name)
(when (member name (external-pending-libraries))
(error #f "circular attempt to import library ~s detected"
name))
(parameterize ([external-pending-libraries
(cons name (external-pending-libraries))])
(let ([lib-expr ((library-locator) name)])
(unless lib-expr
(error #f "cannot find library ~s" name))
((current-library-expander) lib-expr)
(or (find-library-by
(lambda (x) (equal? (library-name x) name)))
(error #f "handling external library of ~s did not yield the currect library" name)))))
(define (find-library-by-name name)
(or (find-library-by
(lambda (x) (equal? (library-name x) name)))
(find-external-library name)))
(define (library-exists? name)
(and (find-library-by
(lambda (x) (equal? (library-name x) name)))
#t))
(define (find-library-by-spec/die spec)
(let ([id (car spec)])
(or (find-library-by
(lambda (x) (eq? id (library-id x))))
(error #f "cannot find library with spec ~s" spec))))
(define label->binding-table (make-hash-table))
(define (install-library-record lib)
(let ([exp-env (library-env lib)])
(for-each
(lambda (x)
(let ([label (car x)] [binding (cdr x)])
(let ([binding
(case (car binding)
[(global)
(cons 'global (cons lib (cdr binding)))]
[(global-macro)
(cons 'global-macro (cons lib (cdr binding)))]
[else binding])])
(put-hash-table! label->binding-table label binding))))
exp-env))
((current-library-collection) lib))
(define (install-library id name ver imp* vis* inv*
exp-subst exp-env visit-code invoke-code visible?)
(let ([imp-lib* (map find-library-by-spec/die imp*)]
[vis-lib* (map find-library-by-spec/die vis*)]
[inv-lib* (map find-library-by-spec/die inv*)])
(unless (and (symbol? id) (list? name) (list? ver))
(error 'install-library "invalid spec ~s ~s ~s" id name ver))
(when (library-exists? name)
(error 'install-library "~s is already installed" name))
(let ([lib (make-library id name ver imp-lib* vis-lib* inv-lib*
exp-subst exp-env visit-code invoke-code
visible?)])
(install-library-record lib))))
(define extend-library-subst!
(lambda (lib sym label)
(set-library-subst! lib
(cons (cons sym label) (library-subst lib)))))
(define extend-library-env!
(lambda (lib label binding)
(set-library-env! lib
(cons (cons label binding) (library-env lib)))
(put-hash-table! label->binding-table label binding)))
(define (imported-label->binding lab)
(get-hash-table label->binding-table lab #f))
(define (invoke-library lib)
(let ([invoke (library-invoke-state lib)])
(when (procedure? invoke)
(set-library-invoke-state! lib
(lambda () (error 'invoke "circularity detected for ~s" lib)))
(for-each invoke-library (library-inv* lib))
(set-library-invoke-state! lib
(lambda () (error 'invoke "first invoke did not return for ~s" lib)))
(invoke)
(set-library-invoke-state! lib #t))))
(define (visit-library lib)
(let ([visit (library-visit-state lib)])
(when (procedure? visit)
(set-library-visit-state! lib
(lambda () (error 'visit "circularity detected for ~s" lib)))
(for-each invoke-library (library-vis* lib))
(set-library-visit-state! lib
(lambda () (error 'invoke "first visit did not return for ~s" lib)))
(visit)
(set-library-visit-state! lib #t))))
(define (invoke-library-by-spec spec)
(invoke-library (find-library-by-spec/die spec)))
(define installed-libraries
(case-lambda
[(all?)
(let f ([ls ((current-library-collection))])
(cond
[(null? ls) '()]
[(or all? (library-visible? (car ls)))
(cons (car ls) (f (cdr ls)))]
[else (f (cdr ls))]))]
[() (installed-libraries #f)]))
(define library-spec
(lambda (x)
(unless (library? x)
(error 'library-spec "~s is not a library" x))
(list (library-id x) (library-name x) (library-ver x))))
;;; init
(set-rtd-printer! (type-descriptor library)
(lambda (x p)
(unless (library? x)
(error 'record-type-printer "not a library"))
(display
(format "#<library ~s>" (append (library-name x) (library-ver x)))
p)))
)