TOML.Utils.Map

Documentation

getPathLens

Arguments

:: (Monad m, Ord k)

=> (NonEmpty k -> Maybe v -> m (Map k v, Map k v -> v))

How to get and set the next Map from the possibly missing value. Passes in the path taken so far.

-> NonEmpty k

-> Map k v

-> m (Maybe v, v -> Map k v)

For a non-empty list of keys, iterate through the given Map and return the possibly missing value at the path and a function to set the value at the given path and return the modified input Map.

let obj = undefined -- { "a": { "b": { "c": 1 } } }
(mValue, setValue) <- getPathLens doRecurse ["a", "b", "c"] obj

print mValue -- Just 1
print (setValue 2) -- { "a": { "b": { "c": 2 } } }

getPath :: (Monad m, Ord k) => (NonEmpty k -> Maybe v -> m (Map k v)) -> NonEmpty k -> Map k v -> m (Maybe v)

Same as getPathLens, except without the setter.