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|
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE UndecidableInstances, PatternSynonyms #-}
{-# OPTIONS_GHC -Wno-orphans #-}
-- |
module Xanthous.Orphans
( ppTemplate
) where
import Xanthous.Prelude hiding (elements)
import Text.Mustache
import Test.QuickCheck
import Data.Text.Arbitrary ()
import Text.Megaparsec (errorBundlePretty)
import Text.Megaparsec.Pos
import Text.Mustache.Type ( showKey )
import Data.List.NonEmpty (NonEmpty(..))
import qualified Data.List.NonEmpty as NonEmpty
import Data.Aeson
import Graphics.Vty.Attributes
instance forall s a.
( Cons s s a a
, MonoFoldable s
) => Cons (NonNull s) (NonNull s) a a where
_Cons = prism hither yon
where
hither :: (a, NonNull s) -> NonNull s
hither (a, ns) =
let s = toNullable ns
in impureNonNull $ a <| s
yon :: NonNull s -> Either (NonNull s) (a, NonNull s)
yon ns = case ns ^? _Cons of
Nothing -> Left ns
Just (a, ns') -> Right (a, ns')
instance Arbitrary PName where
arbitrary = PName . pack <$> listOf1 (elements ['a'..'z'])
instance Arbitrary Key where
arbitrary = Key <$> listOf1 arbSafeText
where arbSafeText = pack <$> listOf1 (elements ['a'..'z'])
shrink (Key []) = error "unreachable"
shrink k@(Key [_]) = pure k
shrink (Key (p:ps)) = Key . (p :) <$> shrink ps
instance Arbitrary Pos where
arbitrary = mkPos . succ . abs <$> arbitrary
shrink (unPos -> 1) = []
shrink (unPos -> x) = mkPos <$> [x..1]
instance Arbitrary Node where
arbitrary = sized node
where
node n | n > 0 = oneof $ leaves ++ branches (n `div` 2)
node _ = oneof leaves
branches n =
[ Section <$> arbitrary <*> subnodes n
, InvertedSection <$> arbitrary <*> subnodes n
]
subnodes = fmap concatTextBlocks . listOf . node
leaves =
[ TextBlock . pack <$> listOf1 (elements ['a'..'z'])
, EscapedVar <$> arbitrary
, UnescapedVar <$> arbitrary
-- TODO fix pretty-printing of mustache partials
-- , Partial <$> arbitrary <*> arbitrary
]
shrink = genericShrink
concatTextBlocks :: [Node] -> [Node]
concatTextBlocks [] = []
concatTextBlocks [x] = [x]
concatTextBlocks (TextBlock txt₁ : TextBlock txt₂ : xs)
= concatTextBlocks $ TextBlock (txt₁ <> txt₂) : concatTextBlocks xs
concatTextBlocks (x : xs) = x : concatTextBlocks xs
instance Arbitrary Template where
arbitrary = do
template <- concatTextBlocks <$> arbitrary
templateName <- arbitrary
rest <- arbitrary
pure $ Template
{ templateActual = templateName
, templateCache = rest & at templateName ?~ template
}
shrink (Template actual cache) =
let Just tpl = cache ^. at actual
in do
cache' <- shrink cache
tpl' <- shrink tpl
actual' <- shrink actual
pure $ Template
{ templateActual = actual'
, templateCache = cache' & at actual' ?~ tpl'
}
instance CoArbitrary Template where
coarbitrary = coarbitrary . ppTemplate
instance Function Template where
function = functionMap ppTemplate parseTemplatePartial
where
parseTemplatePartial txt
= compileMustacheText "template" txt ^?! _Right
instance Arbitrary a => Arbitrary (NonEmpty a) where
arbitrary = do
x <- arbitrary
xs <- arbitrary
pure $ x :| xs
instance CoArbitrary a => CoArbitrary (NonEmpty a) where
coarbitrary = coarbitrary . toList
instance Function a => Function (NonEmpty a) where
function = functionMap toList NonEmpty.fromList
ppNode :: Map PName [Node] -> Node -> Text
ppNode _ (TextBlock txt) = txt
ppNode _ (EscapedVar k) = "{{" <> showKey k <> "}}"
ppNode ctx (Section k body) =
let sk = showKey k
in "{{#" <> sk <> "}}" <> foldMap (ppNode ctx) body <> "{{/" <> sk <> "}}"
ppNode _ (UnescapedVar k) = "{{{" <> showKey k <> "}}}"
ppNode ctx (InvertedSection k body) =
let sk = showKey k
in "{{^" <> sk <> "}}" <> foldMap (ppNode ctx) body <> "{{/" <> sk <> "}}"
ppNode _ (Partial n _) = "{{> " <> unPName n <> "}}"
ppTemplate :: Template -> Text
ppTemplate (Template actual cache) =
case cache ^. at actual of
Nothing -> error "Template not found?"
Just nodes -> foldMap (ppNode cache) nodes
instance ToJSON Template where
toJSON = String . ppTemplate
instance FromJSON Template where
parseJSON
= withText "Template"
$ either (fail . errorBundlePretty) pure
. compileMustacheText "template"
instance CoArbitrary Text where
coarbitrary = coarbitrary . unpack
instance Function Text where
function = functionMap unpack pack
deriving anyclass instance NFData Node
deriving anyclass instance NFData Template
instance FromJSON Color where
parseJSON = withText "Color" $ \case
"black" -> pure black
"red" -> pure red
"green" -> pure green
"yellow" -> pure yellow
"blue" -> pure blue
"magenta" -> pure magenta
"cyan" -> pure cyan
"white" -> pure white
_ -> fail "Invalid color"
instance ToJSON Color where
toJSON color
| color == black = "black"
| color == red = "red"
| color == green = "green"
| color == yellow = "yellow"
| color == blue = "blue"
| color == magenta = "magenta"
| color == cyan = "cyan"
| color == white = "white"
| otherwise = error "unimplemented"
instance (Eq a, Show a, Read a, FromJSON a) => FromJSON (MaybeDefault a) where
parseJSON Null = pure Default
parseJSON x = SetTo <$> parseJSON x
|
