135 lines
4.5 KiB
Racket
135 lines
4.5 KiB
Racket
#lang racket
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(require syntax/parse
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syntax/parse/experimental/eh
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generic-syntax-expanders
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syntax/stx
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(for-syntax syntax/parse
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racket/syntax
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syntax/stx
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racket/pretty)) ;; debug
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;; ------------
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;; eh-mixin — TODO: move to phc-toolkit once the PR #7 for reqprov in
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;; generic-syntax-expander is merged. Look for "End eh-mixin" below for the end.
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(define-expander-type eh-mixin)
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(begin-for-syntax
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(define eh-post-accumulate (make-parameter #f)))
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(define-syntax define-eh-alternative-mixin
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(syntax-parser
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[(_ name ((~literal pattern) pat) ... (~optional (~seq #:post post)))
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(let ()
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(define/with-syntax mixin (format-id #'name "~a-mixin" #'name))
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;(display "post:") (displayln (attribute post))
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#`(begin
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(define-eh-mixin-expander mixin
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(λ (_)
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#,@(if (attribute post)
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#'((unless (eh-post-accumulate)
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(raise-syntax-error
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'define-eh-alternative-mixin
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"#:post used outside of ~no-order"))
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(eh-post-accumulate (quote-syntax post)))
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#'())
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(quote-syntax (~or pat ...))))
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#;(define-eh-alternative-set name
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#,@(stx-map (λ (p)
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#`(pattern #,(expand-all-eh-mixin-expanders p)))
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#'(pat ...)))))]))
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(define-for-syntax (define-?-syntax-class-with-eh-mixins original-form)
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(syntax-parser
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[(_ signature {~and opts {~not ({~literal pattern} . _)}} ...
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({~literal pattern} pat . pat-opts) ...)
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;((λ (x) (pretty-write (syntax->datum x)) x)
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#`(#,original-form
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signature opts ...
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#,@(stx-map (λ (p po)
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#`(pattern #,(expand-all-eh-mixin-expanders p) . #,po))
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#'(pat ...)
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#'(pat-opts ...)))]))
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(define-syntax define-splicing-syntax-class-with-eh-mixins
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(define-?-syntax-class-with-eh-mixins #'define-splicing-syntax-class))
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(define-syntax define-syntax-class-with-eh-mixins
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(define-?-syntax-class-with-eh-mixins #'define-syntax-class))
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(provide define-splicing-syntax-class-with-eh-mixins
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define-syntax-class-with-eh-mixins
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define-eh-alternative-mixin
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(expander-out eh-mixin))
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;; End eh-mixin
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;; ------------
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(define-eh-alternative-mixin structure-kw-instance-or-builder
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(pattern (~optional (~and instance-or-builder
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(~or (~and instance #:instance)
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(~and builder #:builder)))
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#:name "either #:instance or #:builder")))
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(define-eh-alternative-mixin structure-kw-predicate
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(pattern (~optional (~seq #:? predicate:id)
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#:name "#:? predicate")))
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(define-eh-alternative-mixin structure-kw-fields
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(pattern (~once (~seq [field:id] ...)
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#:name "[field]"))
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#:post (~fail #:when (and (attribute instance)
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(not (stx-null? #'(field ...))))))
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(define-eh-alternative-mixin structure-kw-all
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(pattern (~or (structure-kw-instance-or-builder-mixin)
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(structure-kw-predicate-mixin)
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#;(structure-kw-fields-mixin))))
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(define-splicing-syntax-class-with-eh-mixins structure-kws
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(pattern (~seq (structure-kw-all-mixin) ...)))
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#;(define-splicing-syntax-class
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structure-kws
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(pattern
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(~and
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(~seq
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(~or
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(~or
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(~or
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(~optional
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(~and
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instance-or-builder
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(~or (~and instance #:instance) (~and builder #:builder)))
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#:name
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"either #:instance or #:builder"))
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(~or (~optional (~seq #:? predicate:id)
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#:name "#:? predicate"))
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(~or (~once (~and (~seq (field:id) ...))
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#:name "[field] …"))))
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...)
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(~fail #:when (and (attribute instance)
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(not (stx-null? #'(field ...))))))))
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#;(begin
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(syntax-parse #'(#:instance #:? p)
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[(:structure-kws) #'(instance instance-or-builder predicate)])
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(syntax-parse #'(#:builder)
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[(k:structure-kws) #'(k.builder k.instance-or-builder)])
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(syntax-parse #'()
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[(:structure-kws) #'()])
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(syntax-parse #'(#:instance #:? p [f1] [f2])
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[(:structure-kws) #'([field ...] instance)])
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(syntax-parse #'(#:builder [f1] [f2])
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[(:structure-kws) #'([field ...] builder)]))
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#;(syntax-parse #'(#:a)
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[(:structure-kws) 'err]) |