* faster syntax-match implementation.
This commit is contained in:
Abdulaziz Ghuloum
parent
65dbda85fc
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1355665e55
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src/ikarus.boot
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src/ikarus.boot
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@ -6,10 +6,12 @@
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(import
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(ikarus library-manager)
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(only (ikarus compiler) eval-core)
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(rename (except (ikarus) boot-library-expand syntax-error
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(rename (except (ikarus) boot-library-expand
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eval-top-level installed-libraries)
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(free-identifier=? sys:free-identifier=?)
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(identifier? sys:identifier?)
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(syntax-error sys:syntax-error)
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;(syntax->datum sys:syntax->datum)
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(generate-temporaries sys:generate-temporaries)))
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(define who 'expander)
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@ -410,198 +412,120 @@
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(define make-eval-transformer
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(lambda (x)
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(sanitize-binding (eval-core x) x)))
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(module (syntax-match)
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(define-syntax syntax-match-test
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(lambda (ctx)
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(define dots?
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(lambda (x)
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(and (sys:identifier? x)
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(sys:free-identifier=? x #'(... ...)))))
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(define free-identifier-member?
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(lambda (x ls)
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(and (ormap (lambda (y) (sys:free-identifier=? x y)) ls) #t)))
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(define f
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(lambda (ctx lits)
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(syntax-case ctx ()
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[id (sys:identifier? #'id)
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(if (free-identifier-member? #'id lits)
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#'(lambda (x) (and (id? x) (free-id=? x (scheme-stx 'id))))
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#'(lambda (x) #t))]
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[(pat dots) (dots? #'dots)
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(with-syntax ([p (f #'pat lits)])
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#'(lambda (x)
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(and (syntax-list? x)
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(andmap p (syntax->list x)))))]
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[(pat dots . last) (dots? #'dots)
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(with-syntax ([p (f #'pat lits)] [l (f #'last lits)])
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#'(lambda (x)
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(let loop ([x x])
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(cond
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[(syntax-pair? x)
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(and (p (syntax-car x))
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(loop (syntax-cdr x)))]
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[else (l x)]))))]
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[(a . d)
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(with-syntax ([pa (f #'a lits)] [pd (f #'d lits)])
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#'(lambda (x)
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(and (syntax-pair? x)
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(pa (syntax-car x))
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(pd (syntax-cdr x)))))]
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[#(pats ...)
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(with-syntax ([p (f #'(pats ...) lits)])
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#'(lambda (x)
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(and (syntax-vector? x)
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(p (syntax-vector->list x)))))]
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[datum
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(define-syntax syntax-match
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(lambda (ctx)
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(define dots?
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(lambda (x)
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(and (sys:identifier? x)
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(sys:free-identifier=? x #'(... ...)))))
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(define free-identifier-member?
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(lambda (x ls)
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(and (ormap (lambda (y) (sys:free-identifier=? x y)) ls) #t)))
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(define (parse-clause lits cls)
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(define (parse-pat pat)
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(syntax-case pat ()
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[id (sys:identifier? #'id)
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(if (free-identifier-member? #'id lits)
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(values '()
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#'(lambda (x)
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(if (and (id? x) (free-id=? x (scheme-stx 'id)))
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'()
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#f)))
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(values (list #'id)
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#'(lambda (x) (list x))))]
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[(pat dots) (dots? #'dots)
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(let-values ([(pvars decon) (parse-pat #'pat)])
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(with-syntax ([(v* ...) pvars] [decon decon])
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(values pvars
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#'(letrec ([f (lambda (x)
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(cond
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[(syntax-pair? x)
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(let ([cars/f (decon (syntax-car x))])
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(and cars/f
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(let ([cdrs/f (f (syntax-cdr x))])
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(and cdrs/f
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(map cons cars/f cdrs/f)))))]
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[(syntax-null? x)
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(list (begin 'v* '()) ...)]
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[else #f]))])
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f))))]
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[(pat dots . last) (dots? #'dots)
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(let-values ([(p1 d1) (parse-pat #'pat)]
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[(p2 d2) (parse-pat #'last)])
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(with-syntax ([(v* ...) (append p1 p2)]
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[(v1* ...) p1]
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[(v2* ...) p2]
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[d1 d1] [d2 d2])
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(values (append p1 p2)
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#'(letrec ([f (lambda (x)
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(cond
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[(syntax-pair? x)
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(let ([cars/f (d1 (syntax-car x))])
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(and cars/f
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(let ([d/f (f (syntax-cdr x))])
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(and d/f
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(cons (map cons cars/f (car d/f))
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(cdr d/f))))))]
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[else
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(let ([d (d2 x)])
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(and d
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(cons (list (begin 'v1* '()) ...)
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d)))]))])
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(lambda (x)
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(let ([x (f x)])
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(and x (append (car x) (cdr x)))))))))]
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[(pat1 . pat2)
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(let-values ([(p1 d1) (parse-pat #'pat1)]
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[(p2 d2) (parse-pat #'pat2)])
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(with-syntax ([d1 d1] [d2 d2])
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(values (append p1 p2)
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#'(lambda (x)
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(and (syntax-pair? x)
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(let ([q (d1 (syntax-car x))])
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(and q
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(let ([r (d2 (syntax-cdr x))])
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(and r (append q r))))))))))]
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[#(pats ...)
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(let-values ([(pvars d) (parse-pat #'(pats ...))])
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(with-syntax ([d d])
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(values pvars
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#'(lambda (x)
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(and (syntax-vector? x)
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(d (syntax-vector->list x)))))))]
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[datum
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(values '()
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#'(lambda (x)
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(equal? (strip x '()) 'datum))])))
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(syntax-case ctx ()
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[(_ x (lits ...) [pat code])
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(with-syntax ([pat-code (f #'pat #'(lits ...))])
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#'(pat-code x))])))
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(define-syntax syntax-match-conseq
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(lambda (ctx)
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(define free-identifier-member?
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(lambda (x ls)
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(and (ormap (lambda (y) (sys:free-identifier=? x y)) ls) #t)))
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(define dots?
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(lambda (x)
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(and (sys:identifier? x)
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(sys:free-identifier=? x #'(... ...)))))
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(define f
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(lambda (stx lits)
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(syntax-case stx ()
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[id (sys:identifier? #'id)
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(if (free-identifier-member? #'id lits)
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(values '() #'(lambda (x) (dont-call-me)))
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(values (list #'id) #'(lambda (x) x)))]
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[(pat dots) (dots? #'dots)
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(let-values ([(vars extractor) (f #'pat lits)])
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(cond
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[(null? vars)
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(values '() #'(lambda (x) (dont-call-me)))]
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[else
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(values vars
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(with-syntax ([(vars ...) vars]
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[ext extractor]
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[(t* ...) (sys:generate-temporaries vars)])
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#'(lambda (x)
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(let f ([x x] [vars '()] ...)
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(cond
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[(syntax-null? x)
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(values (reverse vars) ...)]
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[else
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(let-values ([(t* ...) (ext (syntax-car x))])
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(f (syntax-cdr x)
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(cons t* vars)
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...))])))))]))]
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[(pat dots . last) (dots? #'dots)
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(let-values ([(pvars pext) (f #'pat lits)])
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(let-values ([(lvars lext) (f #'last lits)])
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(cond
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[(and (null? pvars) (null? lvars))
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(values '() #'(lambda (x) (dont-call-me)))]
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[(null? lvars)
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(values pvars
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(with-syntax ([(pvars ...) pvars]
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[(t* ...) (sys:generate-temporaries pvars)]
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[pext pext])
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#'(lambda (x)
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(let loop ([x x] [pvars '()] ...)
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(cond
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[(syntax-pair? x)
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(let-values ([(t* ...) (pext (syntax-car x))])
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(loop (syntax-cdr x)
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(cons t* pvars) ...))]
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[else
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(values (reverse pvars) ...)])))))]
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[(null? pvars)
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(values lvars
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(with-syntax ([lext lext])
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#'(let loop ([x x])
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(cond
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[(syntax-pair? x) (loop (syntax-cdr x))]
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[else (lext x)]))))]
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[else
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(values (append pvars lvars)
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(with-syntax ([(pvars ...) pvars]
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[(t* ...) (sys:generate-temporaries pvars)]
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[(lvars ...) lvars]
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[lext lext]
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[pext pext])
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#'(lambda (x)
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(let loop ([x x] [pvars '()] ...)
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(cond
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[(syntax-pair? x)
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(let-values ([(t* ...) (pext (syntax-car x))])
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(loop (syntax-cdr x)
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(cons t* pvars) ...))]
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[else
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(let-values ([(lvars ...) (lext x)])
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(values (reverse pvars) ...
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lvars ...))])))))])))]
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[(a . d)
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(let-values ([(avars aextractor) (f #'a lits)])
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(let-values ([(dvars dextractor) (f #'d lits)])
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(cond
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[(and (null? avars) (null? dvars))
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(values '() #'(lambda (x) (dot-call-me)))]
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[(null? avars)
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(values dvars
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(with-syntax ([d dextractor])
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#'(lambda (x) (d (syntax-cdr x)))))]
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[(null? dvars)
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(values avars
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(with-syntax ([a aextractor])
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#'(lambda (x) (a (syntax-car x)))))]
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[else
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(values (append avars dvars)
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(with-syntax ([(avars ...) avars]
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[(dvars ...) dvars]
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[a aextractor]
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[d dextractor])
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#'(lambda (x)
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(let-values ([(avars ...) (a (syntax-car x))])
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(let-values ([(dvars ...) (d (syntax-cdr x))])
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(values avars ... dvars ...))))))])))]
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[#(pats ...)
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(let-values ([(vars extractor) (f #'(pats ...) lits)])
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(cond
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[(null? vars) (values '() #f)]
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[else
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(values vars
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(with-syntax ([extractor extractor])
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#'(lambda (x)
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(extractor (syntax-vector->list x)))))]))]
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[datum
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(values '() #'(lambda (x) (dot-call-me)))])))
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(syntax-case ctx ()
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[(_ x (lits ...) [pat code code* ...])
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(let-values ([(vars extractor)
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(f #'pat #'(lits ...))])
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(with-syntax ([e extractor] [(vs ...) vars])
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(case (length vars)
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[(0) #'(begin #f code)]
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[(1) #'(let ([vs ... (e x)]) #f code)]
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[else #'(let-values ([(vs ...) (e x)]) #f code)])))])))
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(define-syntax syntax-match
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(lambda (x)
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(syntax-case x ()
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[(_ expr (lits ...)) #'(stx-error expr)]
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[(_ expr (lits ...) cls cls* ...)
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#'(let ([t expr])
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(if (syntax-match-test t (lits ...) cls)
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(syntax-match-conseq t (lits ...) cls)
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(syntax-match t (lits ...) cls* ...)))]))))
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(and (equal? (strip x '()) 'datum) '())))]))
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(syntax-case cls ()
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[(pat body)
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(let-values ([(pvars decon) (parse-pat #'pat)])
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(with-syntax ([(v* ...) pvars])
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(values decon
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#'(lambda (v* ...) #t)
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#'(lambda (v* ...) body))))]))
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(syntax-case ctx ()
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[(_ expr (lits ...)) (andmap sys:identifier? #'(lits ...))
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#'(stx-error expr "invalid syntax")]
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[(_ expr (lits ...) cls cls* ...) (andmap sys:identifier? #'(lits ...))
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(let-values ([(decon guard body)
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(parse-clause #'(lits ...) #'cls)])
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(with-syntax ([decon decon]
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[guard guard]
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[body body])
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#'(let ([t expr])
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(let ([ls/false (decon t)])
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(if (and ls/false (apply guard ls/false))
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(apply body ls/false)
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(syntax-match t (lits ...) cls* ...))))))])))
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(define parse-define
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(lambda (x)
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(syntax-match x ()
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[(_ (id . fmls) b b* ...)
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[(__ (id . fmls) b b* ...)
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(if (id? id)
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(values id
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(cons 'defun (cons fmls (cons b b*))))
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(stx-error x))]
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[(_ id val)
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[(__ id val)
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(if (id? id)
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(values id (cons 'expr val))
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(stx-error x))])))
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