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(define-module (language python module)
#:use-module (oop pf-objects)
#:use-module (oop goops)
#:use-module (ice-9 match)
#:use-module (system syntax)
#:use-module (language python exceptions)
#:use-module (language python yield)
#:use-module (language python try)
#:use-module (language python dir)
#:export (Module private public import))
(define-syntax-rule (aif it p x y) (let ((it p)) (if it x y)))
(define-syntax-rule (in-scheme x)
(let ((lan (current-language)))
(dynamic-wind
(lambda () (current-language 'scheme))
(lambda () x)
(lambda () (current-language lan)))))
(define (private mod)
((ref mod '__setprivate__) #t))
(define (public mod)
((ref mod '__setprivate__) #f))
(define e (list 'e))
(define _k
(lambda (k)
(if (string? k)
(string->symbol k)
k)))
(define _m
(lambda (self)
(if (rawref self '_private)
(rawref self '_module)
(rawref self '_export))))
(define-python-class Module ()
(define _modules (make-hash-table))
(define __setprivate__
(lambda (self p)
(rawset self '_isprivate p)))
(define _cont
(lambda (self id pre l nm)
(if id
(aif it (rawref self id)
((ref it '__init__) pre l nm)
(begin
(rawset self id (Module pre l nm))
(_make self pre nm)))
(_make self pre nm))))
(define _contupdate
(lambda (self id pre l nm)
(if id
(aif it (rawref self id)
((ref it '__update__) pre l nm)
(rawset self id (Module pre l nm)))
#f)))
(define __init__
(case-lambda
((self pre l nm)
(match l
((name)
(set self '_path (reverse (cons name pre)))
(_cont self #f (cons name pre) #f (cons name nm)))
((name . (and l (name2 . _)))
(set self '_path (reverse (cons name pre)))
(_cont self name2 (cons name pre) l (cons name nm)))))
((self l nm)
(_cont self #f l #f nm))
((self l)
(if (pair? l)
(if (and (> (length l) 3)
(equal? (list (list-ref l 0)
(list-ref l 1)
(list-ref l 2))
'(language python module)))
(__init__ self (reverse '(language python module)) (cdddr l) '())
#f)
(__init__ self
(map string->symbol
(string-split l #\.)))))))
(define __update__
(case-lambda
((self pre l nm)
(match l
((name)
(_contupdate self #f (cons name pre) #f (cons name nm)))
((name . (and l (name2 . _)))
(_contupdate self name2 (cons name pre) l (cons name nm)))))
((self l nm)
(_contupdate self #f l #f nm))
((self l)
(if (pair? l)
(if (and (> (length l) 3)
(equal? (list (list-ref l 0)
(list-ref l 1)
(list-ref l 2))
'(language python module)))
(__update__ self (reverse '(language python module))
(cdddr l) '()))
(__update__ self
(map string->symbol
(string-split l #\.)))))))
(define _make
(lambda (self l nm)
(rawset self '_private #f)
(if (not (rawref self '_module))
(begin
(set self '__dict__ self)
(set self '__name__ (string-join
(map symbol->string (reverse nm)) "."))
(let ((_module (in-scheme (resolve-module (reverse l)))))
(set self '_export (module-public-interface _module))
(set self '_module _module)
(hash-set! _modules l self))))))
(define __getattribute__
(lambda (self k)
(define (fail)
(raise KeyError "getattr in Module"))
(if (rawref self '_module)
(let ((k (_k k))
(m (_m self)))
(let ((x (pk (module-ref m k e))))
(if (eq? e x)
(fail)
x)))
(fail))))
(define __setattr__
(lambda (self k v)
(let ((k (_k k))
(fail (lambda () (raise KeyError "getattr in Module" k))))
(if (rawref self k)
(fail)
(aif m (rawref self '_module)
(catch #t
(lambda ()
(if (module-defined? m k)
(module-set! m k v)
(module-define! m k v)))
(lambda x (fail)))
(fail))))))
(define __delattr__
(lambda (self k)
(define (fail) (raise KeyError "getattr in Module"))
(aif m (rawref self '_module)
(let ((k (_k k)))
(if (module-defined? m k)
(module-remove! m k)
(raise KeyError "delattr of missing key in Module")))
(fail))))
(define __repr__
(lambda (self) (format #f "Module(~a)" (ref self '__name__))))
(define __getitem__
(lambda (self k)
(define k (if (string? k) (string->symbol k) k))
(__getattribute__ self k)))
(define __iter__
(lambda (self)
(define m (_m self))
((make-generator ()
(lambda (yield)
(define l '())
(define (f k v) (set! l (cons (list (symbol->string k) v) l)))
(module-for-each f m)
(let lp ((l l))
(if (pair? l)
(begin
(apply yield (car l))
(lp (cdr l)))))))))))
(define-syntax import
(lambda (x)
(syntax-case x ()
((_ (a ...) var)
#`(import-f #,(case (syntax-local-binding #'var)
((lexical)
#'var)
((global)
#'(if (module-defined? (current-module)
(syntax->datum #'var))
var
#f))
(else
#f)) a ...)))))
(define (m? x) ((@ (language python module python) isinstance) x Module))
(define (import-f x f . l)
(if x
(if (m? x)
(begin (apply (rawref x '__update__) l) x)
(apply f l))
(apply f l)))
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