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Add core-def form for annotated definitions #86

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Add core-def form for annotated definitions #86

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43 changes: 29 additions & 14 deletions hackett-lib/hackett/private/base.rkt
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
@%superclasses-key @%dictionary-placeholder @%with-dictionary
define-primop define-base-type
-> Integer Double String Bytes
core-def
: λ1 def let letrec todo!)

(define-base-type Integer)
Expand Down Expand Up @@ -415,34 +416,48 @@
#:src this-syntax))]
(attach-type r- t_r #:tooltip-src this-syntax)])))

(define-syntax-parser def
;; core-def is an annotated definition
;; a `def` expands to `core-def` to define a typed variable
(define-syntax-parser core-def
#:literals [:]
[(_ id:id
{~or {~once {~seq {~and : {~var :/use}} {~type t:type}
{~optional {~and #:exact exact?}}}}
{~optional fixity:fixity-annotation}}
[(_ id:id id-:id
{~alt {~once {~seq {~and : {~var :/use}} {~type t:type}
{~optional {~and #:exact exact?}}}}
{~optional fixity:fixity-annotation}}
...
e:expr)
#:with id- (generate-temporary #'id)
#:with t_reduced (if (attribute exact?) #'t.expansion (type-reduce-context #'t.expansion))
#`(begin-
#,(indirect-infix-definition
#'(define-syntax- id (make-typed-var-transformer #'id- (quote-syntax t_reduced)))
(attribute fixity.fixity))
(define- id- (:/use #,((attribute t.scoped-binding-introducer) #'e) t_reduced #:exact)))]
[(_ id:id {~optional fixity:fixity-annotation} e:expr)
(define- id- (:/use #,((attribute t.scoped-binding-introducer) #'e) t_reduced #:exact)))])

(define-syntax-parser def
#:literals [:]
[(_ id:id
{~and
{~seq stuff ...}
{~seq
{~or {~once {~seq {~and : {~var :/use}} {~type t:type}
{~optional {~and #:exact exact?}}}}
{~optional fixity:fixity-annotation}}
...
e:expr}})
#:with id- (generate-temporary #'id)
#'(core-def id id- stuff ...)]
[(_ id:id
{~and {~seq fixity-stuff ...}
{~optional fixity:fixity-annotation}}
e:expr)
(if (and (eq? (syntax-local-context) 'top-level)
(not (syntax-local-elaborate-pass)))
(syntax-local-elaborate-top this-syntax)
(match-let*-values ([[t_e] #`(#%type:wobbly-var #,(generate-temporary))]
[[(list id-) e-] (τ⇐/λ! #'e t_e (list (cons #'id t_e)))]
[[t_gen] (type-reduce-context (generalize (apply-current-subst t_e)))])
#`(begin-
#,(indirect-infix-definition
#`(define-syntax- id (make-typed-var-transformer (quote-syntax #,id-)
(quote-syntax #,t_gen)))
(attribute fixity.fixity))
(define- #,id- #,e-))))])
#`(core-def id #,id- : #,t_gen #:exact fixity-stuff ...
#,e-)))])

(begin-for-syntax
(struct todo-item (full summary) #:prefab))
Expand Down