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|
module Query
( module Query.Type,
query,
)
where
import Control.Exception (throw)
import Data.Aeson qualified as J
import Data.Aeson.Key qualified as JK
import Data.Aeson.KeyMap qualified as JM
import Data.List (isSuffixOf)
import Data.List.NonEmpty qualified as N
import Data.Maybe (fromMaybe)
import Data.Vector qualified as V
import Exception (DecodeException (DecodeException))
import Query.Parser ()
import Query.Printer ()
import Query.Record
import Query.Type
import Store qualified as S
import System.FilePath ((</>))
query :: Query -> IO [J.Value]
query (Select fs c js es w) = do
c' <-
mapM (fmap (fromValue c) . decodeFile . (c </>)) =<< ls c
js' <-
mapM
( \(JoinClause t c w) ->
fmap (\j' -> JoinClause t (map (fromValue c) j') w) . mapM (decodeFile . (c </>))
=<< ls c
)
js
es' <-
mapM
( \(EmbedClause c w) ->
fmap (\e' -> EmbedClause (fromValue c e') w) . mapM (decodeFile . (c </>))
=<< ls c
)
es
pure $ map (Query.select fs) $ where_ w $ embed es' $ join c' js'
where
ls c =
filter (not . (isSuffixOf "/"))
<$> S.withStore "." "HEAD" do
S.listDirectory c
-- TODO use fold
embed ::
EmbedClauses (Record [J.Value]) ->
[Records J.Value] ->
[Records J.Value]
embed es vss = embed' vss es
where
embed' vss [] = vss
embed' vss (EmbedClause (Record c es) w : ess) =
embed'
( map
( \vs ->
let es' :: [J.Value]
es' = filter (\e -> satisfies w (vs ++ [Record c e])) es
in vs
++ [ Record
c
( J.Object
( JM.singleton
(JK.fromString c)
(J.Array (V.fromList es'))
)
)
]
)
vss
)
ess
-- TODO use fold
join ::
Records J.Value ->
JoinClauses (Records J.Value) ->
[Records J.Value]
join vs js = join' (map (: []) vs) js
where
join' vss [] = vss
join' vss (JoinClause JoinLeft js w : jss) =
join'
( concatMap
( \vs -> case filter (satisfies w) $ map (\j -> vs ++ [j]) js of
[] -> [vs]
vs' -> vs'
)
vss
)
jss
join' vss (JoinClause JoinRight js w : jss) =
join'
( concatMap
( \j -> case filter (satisfies w) $ map (\vs -> vs ++ [j]) vss of
[] -> [[j]]
vs' -> vs'
)
js
)
jss
join' vss (JoinClause JoinFull js w : jss) =
join'
( concatMap
( \vs -> case filter (satisfies w) $ map (\j -> vs ++ [j]) js of
[] -> [vs]
vs' -> vs'
)
vss
++ concatMap
( \j -> case filter (satisfies w) $ map (\vs -> vs ++ [j]) vss of
[] -> [[j]]
_ -> []
)
js
)
jss
select :: FieldSelector -> Records J.Value -> J.Value
select All vs = disjointUnions (map toValue vs)
select (Only fs) vs = Query.Record.select (N.toList fs) vs
where_ :: Maybe WhereClause -> [Records J.Value] -> [Records J.Value]
where_ w = filter (satisfies w)
satisfies :: Maybe WhereClause -> Records J.Value -> Bool
satisfies Nothing _ = True
satisfies (Just (And ws)) vs = all (\w -> satisfies (Just w) vs) ws
satisfies (Just (Or ws)) vs = any (\w -> satisfies (Just w) vs) ws
satisfies (Just (Where (Eq f g))) vs = lookups f vs == lookups g vs
decodeFile :: J.FromJSON a => Collection -> IO a
decodeFile fp = S.withStore "." "HEAD" do
fromMaybe (throw DecodeException) . J.decode <$> S.readFile fp
|
