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(define-module (language python modules re)
#:export())
(define-sytax-rule (mk n tag str) (define n (f-seq tag (f-tag str))))
(mk f-. #:. ".")
(mk f-^ #:^ "^")
(mk f-$ #:$ "$")
(define subexpr (f-list #:sub
(f-seq (f-tag "(") f-start ee f-end (f-tag ")"))))
(define f-back
(f-or (f-list #:class (mk-token (f-reg! "[AZbBdDsSwS]")))
(mk-token (f-reg "."))))
(define (ch not)
(f-list #:ch
(f-or! (f-seq (f-char #\\) f-back)
(mk-token (f-not! not)))))
(define bbody (f-cons (ch "[\\]") (ff* (ch "[]\\]"))))
(define choice
(f-cons #:bracket
(f-or!
(f-seq "[^]" (f-out (list #:ch "^")))
(f-cons*
(f-tag "[")
(f? (f-seq (f-tag "^") (f-out #t)))
bbody))))
(define-syntax-rule (mk-post q* str tag)
(define q*
(<p-lambda> (c)
(.. c2 ((f-tag str) c))
(<p-cc> (cons (list tag (car c)) (cdr c))))))
(mk-post q* "*" #:*)
(mk-post q? "?" #:?)
(mk-post q+ "+" #:+)
(mk-post q* "*?" #:*?)
(mk-post q? "??" #:??)
(mk-post q+ "+?" #:+?)
(define q-or
(<p-lambda> (c)
(.. (c2) ((f-seq (f-tag "|") e) '()))
(<p-cc> (list #:or c c2))))
(define q?
(<p-lambda> (c)
(.. c2 ((f-tag "*") c))
(<p-cc> (cons (list #:* (car c)) (cdr c)))))
(define group
(lambda (f)
(<p-lambda> (c1)
(.. c2 (f '()))
(with ((L (cons (cons I c2) L))
(I (+ i 1)))
(<p-cc> (list #:list (#:append c1 c2)))))))
(define group-name
(lambda (f name)
(<p-lambda> (c1)
(.. c2 (f '()))
(with ((L (cons* (cons name c2) (cons I c2) L))
(I (+ i 1)))
(<p-cc> (list #:list (#:append c1 c2)))))))
(define (incant name)
(<p-lambda> (c)
(let ((r (assoc name L)))
(if r
(<and> (.. (f-tag (cdr r))))
(<code> (error "group is not existing in the history"))))))
(define (incant-rev name)
(<p-lambda> (c)
(let ((r (assoc name L)))
(if r
(<and> (.. (f-tag (reverse (cdr r)))))
(<code> (error "group is not existing in the history"))))))
(define (reverse-form x)
(match x
((#:or x y)
(list #:or (reverse-form x) (reverse-form y)))
((#:group f)
(list #:group (reverse-form f)))
((#:?P< f n)
(list #:?P< (reverse-form f) n))
((#:?: f)
(reverse-form f))
((#:?P= name)
(#:?P=-rev name))
((#:?P=-rev name)
(#:?P= name))
((#:?if name yes no)
(list #:?if-rev name (reverse-form yes) (reverse-form no)))
((#:?if-rev name yes no)
(list #:?if name (reverse-form yes) (reverse-form no)))
((#:?= f ) (list #:?= (reverse-form f)))
((#:?! f ) (list #:?! (reverse-form f)))
((#:?<= f ) (list #:?<= f))
((#:?<! f ) (list #:?<! f))
((#:* x ) (list #:* (reverse-form x)))
((#:+ x ) (list #:+ (reverse-form x)))
((#:mn x m n) (list #:mn (reverse-form x) m n))
((#:? x ) (list #:? (reverse-form x)))
((#:*? x ) (list #:*? (reverse-form x)))
((#:+? x ) (list #:+? (reverse-form x)))
((#:?? x ) (list #:?? (reverse-form x)))
((:mn? x m n) (list #:mn? (reverse-form x) m n))
((#:ch x ) (list #:ch x))
((#:bracket . l) (cons #:bracket l))
((x . l) (map reverse-form (cons x l)))
(x x)))
(define (compile x)
(match x
((#:or x y)
(f-or (compile x) (compile y)))
((#:group f)
(group (compile f)))
((#:?P< f n)
(group-name (compile f) n))
((#:?: f)
(compile f))
((#:?P= name)
(incant name))
((#:?P=-rev name)
(incant-rev name))
((#:?= f) (f-and (compile f) f-true))
((#:?! f) (f-and (f-not (compile f)) f-true))
((#:?<= f) (f-and (f-seq f-rev (compile (reverse-form f))) f-true))
((#:?<! f) (f-and (f-seq f-rev (f-not (compile (reverse-form f)))) f-true))
((#:?if name yes no)
(f-or (f-seq (incant name) yes)
no))
((#:?if-rev name yes no)
(f-or (f-seq yes (incant-rev name))
no))
((#:* x ) (g* (compile x) ))
((#:+ x ) (g+ (compile x) ))
((#:mn x m n) (gmn (commile x) m n))
((#:? x ) (g? (compile x) ))
((#:*? x ) (ng* (compile x) ))
((#:+? x ) (ng+ (compile x) ))
((#:?? x ) (ng? (compile x) ))
((:mn? x m n) (ngmn (compile x) m n))
((#:ch (#:class x))
(get-class ch))
((#:ch x)
(f-tag! x))
((#:bracket not ch ...)
(let ((f (apply f-or!
(map (lambda (x)
(match x
((#:ch (:class ch))
(get-class ch))
((#:ch ch)
(f-tag! ch)))) ch))))
(if not
(f-not f)
f)))))
(define (id c) c)
(define (e-match e)
(f-seq (f-or! (f-mute e) (f-return #f))
(f-retfkn id)))
(define (e-fullmatch e)
(f-or! (f-seq (f-mute e) f-eof (f-retfkn id))
(f-return #f)))
(define (e-search e)
(f-or! (f-seq (f-mute e) (f-retfkn id))
(f-seq (f-take 1) (Ds (e-search e)))
(f-return None)))
(define (e-sub e str)
(f-or! (f-seq (f-subst (f-mute e) str) (Ds (e-sub e str)))
(f-seq (f-take 1) (Ds (e-search e)))
(f-out-written)))
(define (e-subn e str)
(let lp ((i 0))
(f-or! (f-seq (f-subst (f-mute e) str) (Ds (lp (+ i 1))))
(f-seq (f-take 1) (Ds (e-search e)))
(f-seq (f-out-written) (f-retfkn (lambda (c) (values c i)))))))
(define (e-split e)
(f-or! (f-cons (f-seq (mk-token f-out-written) (f-mute e)) (e-split e))
(f-cons (f-out-remaining) (f-out '()))))
(define* (findall x s (#:flags 0))
(call-with-values (lambda () (parse e-search x s flags))
(lambda (m cont)
(let lp ((m m) (cont cont))
(if (eq? m None)
'()
(cons m (call-with-values cont lp)))))))
(define* (finditer x s (#:flags 0))
((make-generator ()
(lambda (yield)
(call-with-values (lambda () (parse e-search x s flags))
(lambda (m cont)
(let lp ((m m) (cont cont))
(if (eq? m None)
#f
(begin
(yield m)
(call-with-values cont lp))))))))))
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