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ppx_compose - Inlined Function Composition
ppx_compose is a simple syntax extension which rewrites code containing function compositions into composition-free code, effectively inlining the composition operators. The following two operators are supported
let (%) g f x = g (f x)
let (%>) f g x = g (f x)
Corresponding definitions are not provided, so partial applications of (%) and (%>) will be undefined unless you provide the definitions.
The following rewrites are done:
A composition occurring to the left of an application is reduced by applying each term of the composition from right to left to the argument, ignoring associative variations.
A composition which is not the left side of an application is first turned into one by η-expansion, then the above rule applies.
Any partially applied composition operators are passed though unchanged.
E.g.
h % g % f ==> (fun x -> h (f (g x)))
h % (g % f) ==> (fun x -> h (f (g x)))
(g % f) (h % h) ==> g (f (fun x -> h (h x)))
