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{-# OPTIONS_GHC -fno-warn-orphans #-}
module Store.Query.Parser () where
import Control.Exception (throw)
import Control.Monad (void)
import Data.Aeson qualified as J
import Data.Aeson.Key qualified as JK
import Data.Aeson.KeyMap qualified as JM
import Data.Char (isSpace)
import Data.Map qualified as M
import Data.String (IsString (fromString))
import Data.Text qualified as T
import Data.Vector qualified as V
import Data.Void (Void)
import Store.Exception (ParseError (ParseError))
import Store.Query.Type
import Text.Megaparsec qualified as P
import Text.Megaparsec.Char qualified as P
import Text.Megaparsec.Char.Lexer qualified as P
instance IsString Query where
fromString =
either (throw . ParseError . P.errorBundlePretty @String @Void) id
. P.parse parser ""
where
parser = do
void $ P.many P.space1
P.choice
[ do
delete
from
c <- collection
w <- P.optional do
where_
whereClause
pure $ Delete c w,
do
insert
vs <- objects
into
c <- collection
pure $ Insert vs c,
do
select
fs <- fieldSelector
from
c <- collection
js <- joinClauses
es <- embedClauses
w <- P.optional do
where_
whereClause
l <- P.optional do
limitClause
o <- P.optional do
offsetClause
pure $ Select fs c js es w l o,
do
update
c <- collection
set
v <- object
w <-
P.optional do
where_
whereClause
pure $ Update c v w
]
<* P.eof
lexeme :: P.Parsec Void String a -> P.Parsec Void String a
lexeme = P.lexeme $ void $ P.takeWhileP Nothing isSpace
set = void $ lexeme (P.string "SET")
update = void $ lexeme (P.string "UPDATE")
into = void $ lexeme (P.string "INTO")
insert = void $ lexeme (P.string "INSERT")
delete = void $ lexeme (P.string "DELETE")
and = void $ lexeme (P.string "AND")
colon = void $ lexeme (P.string ":")
comma = void $ lexeme (P.string ",")
embed = void $ lexeme (P.string "EMBED")
eq = void $ lexeme (P.string "==")
from = void $ lexeme (P.string "FROM")
on = void $ lexeme (P.string "ON")
or = void $ lexeme (P.string "OR")
select = void $ lexeme (P.string "SELECT")
where_ = void $ lexeme (P.string "WHERE")
offset_ = void $ lexeme (P.string "OFFSET")
limit_ = void $ lexeme (P.string "LIMIT")
collection = lexeme $ P.takeWhile1P (Just "collection") (not . isSpace)
joinClauses = P.many joinClause
joinClause = do
t <- joinType
c <- collection
w <- P.optional do
on
whereClause
pure $ JoinClause t c w
embedClauses = P.many embedClause
embedClause = do
embed
c <- collection
w <- P.optional do
on
whereClause
pure $ EmbedClause c w
whereClause =
P.choice
[ P.try (And . map Where <$> P.sepBy1 comparison and),
P.try (Or . map Where <$> P.sepBy1 comparison or),
Where <$> comparison
]
comparison = do
a <- P.choice [Left <$> value, Right <$> field]
eq
b <- P.choice [Left <$> value, Right <$> field]
pure $ Eq a b
offsetClause = do
offset_
Offset <$> lexeme P.decimal
limitClause = do
limit_
Limit <$> lexeme P.decimal
fieldSelector =
lexeme $
P.choice
[ do
void $ lexeme $ P.string "{"
kvs <-
P.sepBy
( P.choice
[ P.try do
k <-
lexeme $
P.takeWhile1P
Nothing
( \c ->
not (isSpace c)
&& c /= '.'
&& c /= ','
&& c /= ':'
)
lexeme $ colon
v <- fieldSelector
pure (k, v),
do
f@(Field c ks) <- field
let k
| null ks = c
| otherwise = T.unpack (last ks)
pure (k, SelectField f)
]
)
comma
void $ lexeme $ P.string "}"
pure $ SelectObject (M.fromList kvs),
do
SelectField <$> field
]
objects = P.sepBy object comma
object = lexeme do
void $ lexeme $ P.string "{"
kvs <-
P.sepBy
( do
k <-
lexeme $ do
void $ lexeme $ P.string "\""
P.takeWhile1P
Nothing
(/= '\"')
<* (void $ lexeme $ P.string "\"")
lexeme $ colon
v <- value
pure (JK.fromString k, v)
)
comma
void $ lexeme $ P.string "}"
pure $ J.Object (JM.fromList kvs)
value =
P.choice
[ object,
array,
string,
number,
bool,
null_
]
array = lexeme do
void $ lexeme $ P.string "["
vs <- P.sepBy value comma
void $ lexeme $ P.string "]"
pure $ J.Array (V.fromList vs)
string = lexeme do
void $ lexeme $ P.string "\""
s <- P.takeWhileP Nothing (\c -> c /= '\"')
void $ lexeme $ P.string "\""
pure $ J.String (T.pack s)
number = lexeme do
J.Number <$> P.scientific
bool = lexeme do
J.Bool
<$> P.choice
[ const True <$> P.string "true",
const False <$> P.string "false"
]
null_ = lexeme do
const J.Null <$> P.string "null"
field :: P.Parsec Void String Field
field =
lexeme do
Field
<$> fieldPart
<*> ( P.choice
[ do
void $ P.string "."
map T.pack <$> P.sepBy fieldPart (P.string "."),
do
pure []
]
)
fieldPart :: P.Parsec Void String String
fieldPart = P.takeWhile1P Nothing (\c -> not (isSpace c) && c /= ',' && c /= '.')
joinType :: P.Parsec Void String JoinType
joinType =
P.choice
[ do
void $ lexeme (P.string "LEFT")
void $ lexeme (P.string "JOIN")
pure JoinLeft,
do
void $ lexeme (P.string "RIGHT")
void $ lexeme (P.string "JOIN")
pure JoinRight,
do
void $ lexeme (P.string "FULL")
void $ lexeme (P.string "JOIN")
pure JoinFull
]
|
