{-# LANGUAGE DeriveTraversable, FlexibleInstances, Safe #-}

{-|
Module      : Data.Char.Block
Description : A module used to render blocks in unicode.
Maintainer  : hapytexeu+gh@gmail.com
Stability   : experimental
Portability : POSIX

Unicode has 2-by-2 blocks, this module aims to make it more convenient to render such blocks.
-}

module Data.Char.Block(
    -- * Datastructures to store the state of the frame.
    Row(Row, left, right)
  , Block(Block, upper, lower)
    -- * A unicode character that is (partially) filled block.
  , filled
    -- * Convert a 'Char'acter to a (partially) filled block.
  , fromBlock, fromBlock'
  ) where

import Data.Maybe(fromJust)
import Data.Char.Core(UnicodeCharacter(toUnicodeChar, fromUnicodeChar), UnicodeText)

import Test.QuickCheck.Arbitrary(Arbitrary(arbitrary), Arbitrary1(liftArbitrary), arbitrary1)

-- | A data type that determines the state of the /row/ in a block.
-- it determines the left and the right part of the row of the block.
data Row a = Row { 
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left :: a  -- ^ The left part of a row of the block.
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right :: a  -- ^ The right part of the row of the block.
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pure a
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<*> Row a
l)

instance Arbitrary a => Arbitrary (Row a) where
    arbitrary :: Gen (Row a)
arbitrary = Gen (Row a)
forall (f :: * -> *) a. (Arbitrary1 f, Arbitrary a) => Gen (f a)
arbitrary1

instance Arbitrary1 Row where
    liftArbitrary :: Gen a -> Gen (Row a)
liftArbitrary Gen a
arb = a -> a -> Row a
forall a. a -> a -> Row a
Row (a -> a -> Row a) -> Gen a -> Gen (a -> Row a)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Gen a
arb Gen (a -> Row a) -> Gen a -> Gen (Row a)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Gen a
arb

instance Arbitrary a => Arbitrary (Block a) where
    arbitrary :: Gen (Block a)
arbitrary = Gen (Block a)
forall (f :: * -> *) a. (Arbitrary1 f, Arbitrary a) => Gen (f a)
arbitrary1

instance Arbitrary1 Block where
    liftArbitrary :: Gen a -> Gen (Block a)
liftArbitrary Gen a
arb = Row a -> Row a -> Block a
forall a. Row a -> Row a -> Block a
Block (Row a -> Row a -> Block a)
-> Gen (Row a) -> Gen (Row a -> Block a)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Gen (Row a)
arb' Gen (Row a -> Block a) -> Gen (Row a) -> Gen (Block a)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Gen (Row a)
arb'
        where arb' :: Gen (Row a)
arb' = Gen a -> Gen (Row a)
forall (f :: * -> *) a. Arbitrary1 f => Gen a -> Gen (f a)
liftArbitrary Gen a
arb

-- | Convert the given 'Char'acter to a 'Block' of 'Bool's wrapped in a 'Just'
-- if it exists; 'Nothing' otherwise.
fromBlock
  :: Char  -- ^ The given 'Char'acter to convert to a 'Block' of 'Bool's.
  -> Maybe (Block Bool)  -- The equivalent 'Block' of 'Bool's wrapped in a 'Just' if such block exists; 'Nothing' otherwise.
fromBlock :: Char -> Maybe (Block Bool)
fromBlock Char
' ' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False))
fromBlock Char
'\x2580' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False))
fromBlock Char
'\x2584' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ))
fromBlock Char
'\x2588' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ))
fromBlock Char
'\x258c' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False))
fromBlock Char
'\x2590' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ))
fromBlock Char
'\x2596' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False))
fromBlock Char
'\x2597' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ))
fromBlock Char
'\x2598' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False))
fromBlock Char
'\x2599' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ))
fromBlock Char
'\x259a' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ))
fromBlock Char
'\x259b' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False))
fromBlock Char
'\x259c' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ))
fromBlock Char
'\x259d' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
False))
fromBlock Char
'\x259e' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
False))
fromBlock Char
'\x259f' = Block Bool -> Maybe (Block Bool)
forall a. a -> Maybe a
Just (Row Bool -> Row Bool -> Block Bool
forall a. Row a -> Row a -> Block a
Block (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
False Bool
True ) (Bool -> Bool -> Row Bool
forall a. a -> a -> Row a
Row Bool
True  Bool
True ))
fromBlock Char
_ = Maybe (Block Bool)
forall a. Maybe a
Nothing

-- | Convert the given 'Char'acter to a 'Block' of 'Bool's if it exists; unspecified result otherwise.
fromBlock'
  :: Char  -- ^ The given 'Char'acter to convert to a 'Block' of 'Bool's.
  -> Block Bool  -- ^ The equivalent 'Block' of 'Bool's.
fromBlock' :: Char -> Block Bool
fromBlock' = Maybe (Block Bool) -> Block Bool
forall a. HasCallStack => Maybe a -> a
fromJust (Maybe (Block Bool) -> Block Bool)
-> (Char -> Maybe (Block Bool)) -> Char -> Block Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Char -> Maybe (Block Bool)
fromBlock

-- | Convert the given 'Block' value to a block character in unicode.
-- 'True' means that part is filled, and 'False' means the part is not filled.
filled
    :: Block Bool  -- ^ The given 'Block' of 'Bool's to convert to a 'Char'acter.
    -> Char  -- ^ The equivalent Unicode 'Char'acter for the given 'Block' of 'Bool's.
filled :: Block Bool -> Char
filled (Block (Row Bool
False Bool
False) (Row Bool
False Bool
False)) = Char
' '
filled (Block (Row Bool
True  Bool
True ) (Row Bool
False Bool
False)) = Char
'\x2580'
filled (Block (Row Bool
False Bool
False) (Row Bool
True  Bool
True )) = Char
'\x2584'
filled (Block (Row Bool
True  Bool
True ) (Row Bool
True  Bool
True )) = Char
'\x2588'
filled (Block (Row Bool
True  Bool
False) (Row Bool
True  Bool
False)) = Char
'\x258c'
filled (Block (Row Bool
False Bool
True ) (Row Bool
False Bool
True )) = Char
'\x2590'
filled (Block (Row Bool
False Bool
False) (Row Bool
True  Bool
False)) = Char
'\x2596'
filled (Block (Row Bool
False Bool
False) (Row Bool
False Bool
True )) = Char
'\x2597'
filled (Block (Row Bool
True  Bool
False) (Row Bool
False Bool
False)) = Char
'\x2598'
filled (Block (Row Bool
True  Bool
False) (Row Bool
True  Bool
True )) = Char
'\x2599'
filled (Block (Row Bool
True  Bool
False) (Row Bool
False Bool
True )) = Char
'\x259a'
filled (Block (Row Bool
True  Bool
True ) (Row Bool
True  Bool
False)) = Char
'\x259b'
filled (Block (Row Bool
True  Bool
True ) (Row Bool
False Bool
True )) = Char
'\x259c'
filled (Block (Row Bool
False Bool
True ) (Row Bool
False Bool
False)) = Char
'\x259d'
filled (Block (Row Bool
False Bool
True ) (Row Bool
True  Bool
False)) = Char
'\x259e'
filled (Block (Row Bool
False Bool
True ) (Row Bool
True  Bool
True )) = Char
'\x259f'

instance UnicodeCharacter (Block Bool) where
    toUnicodeChar :: Block Bool -> Char
toUnicodeChar = Block Bool -> Char
filled
    fromUnicodeChar :: Char -> Maybe (Block Bool)
fromUnicodeChar = Char -> Maybe (Block Bool)
fromBlock

instance UnicodeText (Block Bool)