diff options
Diffstat (limited to '')
| -rw-r--r-- | stdlib/source/lux/abstract/monad.lux | 47 |
1 files changed, 35 insertions, 12 deletions
diff --git a/stdlib/source/lux/abstract/monad.lux b/stdlib/source/lux/abstract/monad.lux index 491f9b6a2..12f75e9ac 100644 --- a/stdlib/source/lux/abstract/monad.lux +++ b/stdlib/source/lux/abstract/monad.lux @@ -58,12 +58,24 @@ [y (f1 x) z (f2 z)] (wrap (f3 z))))} - (case tokens - (#.Cons monad (#.Cons [_ (#.Tuple bindings)] (#.Cons body #.Nil))) + (case (: (Maybe [(Maybe Text) Code (List Code) Code]) + (case tokens + (^ (list [_ (#.Record (list [[_ (#.Identifier ["" name])] monad]))] [_ (#.Tuple bindings)] body)) + (#.Some [(#.Some name) monad bindings body]) + + (^ (list monad [_ (#.Tuple bindings)] body)) + (#.Some [#.None monad bindings body]) + + _ + #.None)) + (#.Some [?name monad bindings body]) (if (|> bindings list@size .int ("lux i64 %" +2) ("lux i64 =" +0)) - (let [g!_ (: Code [_cursor (#.Identifier ["" " _ "])]) - g!map (: Code [_cursor (#.Identifier ["" " map "])]) - g!join (: Code [_cursor (#.Identifier ["" " join "])]) + (let [[module short] (name-of ..do) + gensym (: (-> Text Code) + (|>> ($_ "lux text concat" module " " short " ") [""] #.Identifier [_cursor])) + g!_ (gensym "_") + g!map (gensym "map") + g!join (gensym "join") body' (list@fold (: (-> [Code Code] Code Code) (function (_ binding body') (let [[var value] binding] @@ -76,15 +88,26 @@ )))) body (reverse (as-pairs bindings)))] - (#.Right [state (#.Cons (` ({(~' @) - ({[(~ g!map) (~' wrap) (~ g!join)] - (~ body')} - (~' @))} - (~ monad))) - #.Nil)])) + (#.Right [state (list (case ?name + (#.Some name) + (let [name [_cursor (#.Identifier ["" name])]] + (` ({(~ name) + ({{#..&functor {#functor.map (~ g!map)} + #..wrap (~' wrap) + #..join (~ g!join)} + (~ body')} + (~ name))} + (~ monad)))) + + #.None + (` ({{#..&functor {#functor.map (~ g!map)} + #..wrap (~' wrap) + #..join (~ g!join)} + (~ body')} + (~ monad)))))])) (#.Left "'do' bindings must have an even number of parts.")) - _ + #.None (#.Left "Wrong syntax for 'do'"))) (def: #export (bind monad f) |