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Improvements on subtemplate

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This commit is contained in:
Georges Dupéron 2017-01-22 05:05:25 +01:00
parent 693ab9e84e
commit f500dfcb1a
1 changed files with 15 additions and 37 deletions
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52
subtemplate.rkt
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@ -127,6 +127,14 @@
(not (string=? binder-subscripts ""))
binder-subscripts)))
(define/contract (drop-subscripts id)
(-> identifier? identifier?)
(let* ([str (symbol->string (syntax-e id))]
[sub (extract-subscripts id)]
[new-str (substring str 0 (- (string-length str)
(string-length sub)))])
(datum->syntax id (string->symbol new-str) id id)))
(define/contract (find-subscript-binder2a lctx scopes bound scope-depth)
(-> identifier?
(listof (cons/c identifier? (listof symbol?)))
@ -268,9 +276,13 @@
stx-scope-depth) ()
(define depth (syntax-e #'stx-depth))
(define/with-syntax bound-ddd (nest-ellipses #'bound depth))
(define/with-syntax tmp-id (format-id #'here "~a/~a" #'max-binder0 #'bound))
(define/with-syntax tmp-str (datum->syntax #'tmp-id (symbol->string
(syntax-e #'tmp-id))))
(define/with-syntax tmp-id
(format-id #'here "~a/~a" #'max-binder0 (drop-subscripts #'bound)))
(define/with-syntax tmp-str
(datum->syntax #'tmp-id
(symbol->string
(syntax-e
(format-id #'here "~~a/~a" (drop-subscripts #'bound))))))
(define/with-syntax tmp-ddd (nest-ellipses #'tmp-id depth))
(define/with-syntax binder-ddd (nest-ellipses #'max-binder0 depth))
@ -318,37 +330,3 @@
(define/with-syntax bound-ddd cached)
(define-syntax #,(format-id #'bound " is-derived-~a " #'bound)
(derived)))))
#|
(require syntax/parse/experimental/private/substitute)
;; Not very clean, but syntax/parse/experimental/template should export it :-(
(define (stolen-current-template-metafunction-introducer)
((eval #'current-template-metafunction-introducer
(module->namespace 'syntax/parse/experimental/private/substitute))))
;; Note: define-unhygienic-template-metafunction probably only works correctly
;; when the metafunction is defined in the same file as it is used. The macro
;; which is built using that or other metafunctions can be used anywhere,
;; though. This is because we use a hack to guess what the old-mark from
;; syntax/parse/experimental/private/substitute is.
(define-syntax (define-unhygienic-template-metafunction xxx)
(syntax-case xxx ()
[(mee (name stx) . code)
(datum->syntax
#'mee
`(define-template-metafunction (,#'name ,#'tmp-stx)
(syntax-case ,#'tmp-stx ()
[(self . _)
(let* ([zero (datum->syntax #f 'zero)]
[normal ((,#'stolen-current-template-metafunction-introducer) (quote-syntax here))
#;(syntax-local-introduce
(syntax-local-get-shadower
(datum->syntax #f 'shadower)))]
[+self (make-syntax-delta-introducer normal zero)]
[+normal (make-syntax-delta-introducer normal zero)]
[mark (make-syntax-delta-introducer (+normal #'self 'flip)
zero)]
[,#'stx (syntax-local-introduce (mark ,#'tmp-stx 'flip))])
(mark (syntax-local-introduce (let () . ,#'code))))])))]))
|#