mirror of
https://github.com/correl/calrissian.git
synced 2024-11-23 19:19:57 +00:00
25 lines
555 B
Text
25 lines
555 B
Text
(defmacro do args
|
|
(let ((monad (car args))
|
|
(statements (cdr args)))
|
|
(monad:do-transform monad statements)))
|
|
|
|
(defmacro >>= (monad m f)
|
|
`(: ,monad >>= ,m ,f))
|
|
|
|
(defmacro >> (monad m1 m2)
|
|
`(: ,monad >>= ,m1 (lambda (_) ,m2)))
|
|
|
|
(defmacro return (monad expr)
|
|
`(: ,monad return ,expr))
|
|
|
|
(defmacro sequence (monad list)
|
|
`(: lists foldr
|
|
(lambda (m acc) (mcons ,monad m acc))
|
|
(return ,monad [])
|
|
,list))
|
|
|
|
(defmacro mcons (monad m mlist)
|
|
`(do ,monad
|
|
(x <- ,m)
|
|
(rest <- ,mlist)
|
|
(return ,monad (cons x rest))))
|