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#lang racket/base
(require racket/list
racket/match
racket/stxparam
net/url
web-server/dispatchers/dispatch
web-server/dispatch/http-expanders
web-server/dispatch/bidi-match
(for-syntax racket/base
syntax/parse
web-server/dispatch/pattern))
(define (default-else req)
(next-dispatcher))
(begin-for-syntax
(define default-method #'(or #f "get")))
(define (string-list->url strlist)
(url->string
(make-url #f #f #f #f #t
(if (empty? strlist)
(list (make-path/param "" empty))
(map (lambda (s) (make-path/param s empty))
strlist))
empty #f)))
(define-syntax (dispatch-case stx)
(syntax-parse
stx #:literals (else)
[(_ [(path-pat ...)
(~optional (~seq #:method method)
#:defaults ([method default-method]))
fun]
...
[else else-fun])
#:fail-unless
(for-each dispatch-pattern?
(syntax->list #'((path-pat ...) ...)))
"Not a dispatch pattern"
(with-syntax
([((path-pat/id ...) ...)
(map dispatch-pattern->dispatch-pattern/ids
(syntax->list #'((path-pat ...) ...)))])
(with-syntax
([((path-pat-id ...) ...)
(map (lambda (pp/is)
(map (lambda (bs)
(with-syntax ([(bidi-id arg ... id) bs])
#'id))
(filter (lambda (pp/i)
(syntax-case pp/i ()
[(bidi-id arg ... id) #t]
[_ #f]))
(syntax->list pp/is))))
(syntax->list #'((path-pat/id ...) ...)))])
(syntax/loc stx
(lambda (the-req)
(syntax-parameterize ([bidi-match-going-in? #t])
(match the-req
[(request/url method (url/paths path-pat/id ...))
(fun the-req path-pat-id ...)]
...
[_ (else-fun the-req)]))))))]
[(dc [(path-pat ...)
(~optional (~seq #:method method)
#:defaults ([method default-method]))
fun]
...)
(syntax/loc stx
(dc [(path-pat ...)
#:method method
fun]
...
[else default-else]))]))
(define-syntax (dispatch-url stx)
(syntax-parse
stx
[(_ [(path-pat ...) fun]
...)
(for-each dispatch-pattern?
(syntax->list #'((path-pat ...) ...)))
(with-syntax
([((path-pat/id ...) ...)
(map dispatch-pattern->dispatch-pattern/ids
(syntax->list #'((path-pat ...) ...)))])
(with-syntax
([((from-path-pat ...) ...)
(map (lambda (pp/is-pre)
(define pp/is
(datum->syntax pp/is-pre
(filter (compose not string-syntax?) (syntax->list pp/is-pre))
pp/is-pre))
(for/list ([pp/i (dispatch-pattern-not-... pp/is)]
[next-...? (dispatch-pattern-next-...? pp/is)])
(with-syntax ([pp pp/i]
[(bidi-id arg ... id) pp/i])
(if next-...?
(syntax/loc pp/i (list pp (... ...)))
pp/i))))
(syntax->list #'((path-pat/id ...) ...)))]
[((from-body ...) ...)
(map (lambda (pp/is)
(for/list ([pp/i (dispatch-pattern-not-... pp/is)]
[next-...? (dispatch-pattern-next-...? pp/is)])
(with-syntax ([pp pp/i])
(if (string-syntax? pp/i)
(syntax/loc pp/i (list pp))
(with-syntax ([(bidi-id arg ... id) pp/i])
(if next-...?
(syntax/loc pp/i id)
(syntax/loc pp/i (list id))))))))
(syntax->list #'((path-pat/id ...) ...)))])
(syntax/loc stx
(syntax-parameterize ([bidi-match-going-in? #f])
(match-lambda*
[(list (? (lambda (x) (eq? x fun))) from-path-pat ...)
(string-list->url (append from-body ...))]
...)))))]))
(define-syntax (dispatch-rules stx)
(syntax-parse
stx #:literals (else)
[(_ [(path-pat ...)
(~optional (~seq #:method method)
#:defaults ([method default-method]))
fun]
...
[else else-fun])
(for-each dispatch-pattern?
(syntax->list #'((path-pat ...) ...)))
(syntax/loc stx
(values
(dispatch-case [(path-pat ...)
#:method method
fun]
...
[else else-fun])
(dispatch-url [(path-pat ...) fun]
...)))]
[(dr [(path-pat ...)
(~optional (~seq #:method method)
#:defaults ([method default-method]))
fun]
...)
(syntax/loc stx
(dr [(path-pat ...)
#:method method
fun]
...
[else default-else]))]))
(define (dispatch-succ . _) #t)
(define (dispatch-fail . _) #f)
(define-syntax (dispatch-rules+applies stx)
(syntax-parse
stx #:literals (else)
[(_
[pat
(~optional (~seq #:method method)
#:defaults ([method default-method]))
fun]
...
[else else-fun])
(syntax/loc stx
(let-values ([(dispatch url)
(dispatch-rules
[pat #:method method fun]
...
[else else-fun])]
[(applies?)
(λ (req) #t)])
(values dispatch url applies?)))]
[(_
[pat
(~optional (~seq #:method method)
#:defaults ([method default-method]))
fun]
...)
(syntax/loc stx
(let-values ([(dispatch url)
(dispatch-rules
[pat #:method method fun]
...)]
[(applies?)
(dispatch-case
[pat #:method method dispatch-succ]
...
[else dispatch-fail])])
(values dispatch url applies?)))]))
(provide dispatch-case
dispatch-url
dispatch-rules
dispatch-rules+applies)
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