;;;
;;; SRFI-232 - Flexible curried procedures
;;;
;;;   Copyright (c) 2022-2025  Shiro Kawai  <shiro@acm.org>
;;;
;;;   Redistribution and use in source and binary forms, with or without
;;;   modification, are permitted provided that the following conditions
;;;   are met:
;;;
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;;;      notice, this list of conditions and the following disclaimer.
;;;
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;;;      documentation and/or other materials provided with the distribution.
;;;
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;;;      software without specific prior written permission.
;;;
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;;;

(define-module srfi.232
  (use util.match)
  (export curried define-curried))
(select-module srfi.232)

;; We carry around the name to be bound to the curried procedure
;; if available, so that it can be displayed.

(define-syntax curried/name
  (er-macro-transformer
   (^[f r c]
     (match f
       [(_ name () body)
        (quasirename r `(begin ,@body))]
       [(_ name (? identifier? var) body)
        (quasirename r `(lambda ,var ,@body))]
       [(_ name (? proper-list? formals) body)
        (quasirename r
          `(rec ,name
             (case-lambda
               [() ,name]
               [,formals (begin ,@body)]
               [(,@formals . rest)
                ,(quasirename r
                   `(apply (,name ,@formals) rest))]
               [partial-args
                ,(quasirename r
                   `(apply pa$ ,name partial-args))])))]
       [(_ name dotted-formals body)
        (quasirename r
          `(rec ,name
             (case-lambda
               [() ,name]
               [,dotted-formals (begin ,@body)]
               [partial-args
                ,(quasirename r
                   `(apply pa$ ,name partial-args))])))]))))

(define-syntax curried
  (syntax-rules ()
    [(_ formals . body) (curried/name curried-procedure formals body)]))

(define-syntax define-curried
  (syntax-rules ()
    [(_ (name . formals) . body)
     (define name (curried/name name formals body))]))
