{-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE TypeFamilies #-} {-# LANGUAGE UndecidableInstances #-} {-# LANGUAGE ConstraintKinds #-} {-# LANGUAGE MultiParamTypeClasses #-} {-# LANGUAGE FunctionalDependencies #-} -- | Abstractions over sequential data structures, like lists and vectors. module Data.Sequences where import Data.Maybe (fromJust, isJust) import Data.Monoid (Monoid, mconcat, mempty, (<>)) import Data.MonoTraversable import Data.Int (Int64, Int) import qualified Data.List as List import qualified Data.List.Split as List import qualified Control.Monad (filterM, replicateM) import Prelude (Bool (..), Monad (..), Maybe (..), Ordering (..), Ord (..), Eq (..), Functor (..), fromIntegral, otherwise, (-), fst, snd, Integral, ($), flip, maybe, error) import Data.Char (Char, isSpace) import qualified Data.ByteString as S import qualified Data.ByteString.Lazy as L import qualified Data.Text as T import qualified Data.Text.Lazy as TL import Control.Category import Control.Arrow ((***), first, second) import Control.Monad (liftM) import qualified Data.Sequence as Seq import qualified Data.Vector as V import qualified Data.Vector.Unboxed as U import qualified Data.Vector.Storable as VS import Data.String (IsString) import qualified Data.List.NonEmpty as NE import qualified Data.ByteString.Unsafe as SU import qualified Data.Vector.Generic as VG import qualified Data.Vector.Algorithms.Merge as VAM import Data.Ord (comparing) import qualified Data.Text.Encoding as T import qualified Data.Text.Lazy.Encoding as TL import Data.Text.Encoding.Error (lenientDecode) import Data.Word (Word8) -- | 'SemiSequence' was created to share code between 'IsSequence' and 'NonNull'. -- -- @Semi@ means 'SemiGroup' -- A 'SemiSequence' can accomodate a 'SemiGroup' such as 'NonEmpty' or 'NonNull' -- A Monoid should be able to fill out 'IsSequence'. -- -- 'SemiSequence' operations maintain the same type because they all maintain the same number of elements or increase them. -- However, a decreasing function such as filter may change they type. -- For example, from 'NonEmpty' to '[]' -- This type-changing function exists on 'NonNull' as 'nfilter' -- -- 'filter' and other such functions are placed in 'IsSequence' -- -- /NOTE/: Like 'GrowingAppend', ideally we'd have a @Semigroup@ superclass -- constraint here, but that would pull in more dependencies to this package -- than desired. class (Integral (Index seq), GrowingAppend seq) => SemiSequence seq where -- | The type of the index of a sequence. type Index seq -- | 'intersperse' takes an element and intersperses that element between -- the elements of the sequence. -- -- @ -- > 'intersperse' ',' "abcde" -- "a,b,c,d,e" -- @ intersperse :: Element seq -> seq -> seq -- | Reverse a sequence -- -- @ -- > 'reverse' "hello world" -- "dlrow olleh" -- @ reverse :: seq -> seq -- | 'find' takes a predicate and a sequence and returns the first element in -- the sequence matching the predicate, or 'Nothing' if there isn't an element -- that matches the predicate. -- -- @ -- > 'find' (== 5) [1 .. 10] -- 'Just' 5 -- -- > 'find' (== 15) [1 .. 10] -- 'Nothing' -- @ find :: (Element seq -> Bool) -> seq -> Maybe (Element seq) -- | Sort a sequence using an supplied element ordering function. -- -- @ -- > let compare' x y = case 'compare' x y of LT -> GT; EQ -> EQ; GT -> LT -- > 'sortBy' compare' [5,3,6,1,2,4] -- [6,5,4,3,2,1] -- @ sortBy :: (Element seq -> Element seq -> Ordering) -> seq -> seq -- | Prepend an element onto a sequence. -- -- @ -- > 4 \``cons`` [1,2,3] -- [4,1,2,3] -- @ cons :: Element seq -> seq -> seq -- | Append an element onto a sequence. -- -- @ -- > [1,2,3] \``snoc`` 4 -- [1,2,3,4] -- @ snoc :: seq -> Element seq -> seq -- | Create a sequence from a single element. -- -- @ -- > 'singleton' 'a' :: 'String' -- "a" -- > 'singleton' 'a' :: 'Vector' 'Char' -- 'Data.Vector.fromList' "a" -- @ singleton :: IsSequence seq => Element seq -> seq singleton = opoint {-# INLINE singleton #-} -- | Sequence Laws: -- -- @ -- 'fromList' . 'otoList' = 'id' -- 'fromList' (x <> y) = 'fromList' x <> 'fromList' y -- 'otoList' ('fromList' x <> 'fromList' y) = x <> y -- @ class (Monoid seq, MonoTraversable seq, SemiSequence seq, MonoPointed seq) => IsSequence seq where -- | Convert a list to a sequence. -- -- @ -- > 'fromList' ['a', 'b', 'c'] :: Text -- "abc" -- @ fromList :: [Element seq] -> seq -- this definition creates the Monoid constraint -- However, all the instances define their own fromList fromList = mconcat . fmap singleton -- | 'lengthIndex' returns the length of a sequence as @'Index' seq@. -- -- @since 1.0.2 lengthIndex :: seq -> Index seq; lengthIndex = fromIntegral . olength64; -- below functions change type fron the perspective of NonEmpty -- | 'break' applies a predicate to a sequence, and returns a tuple where -- the first element is the longest prefix (possibly empty) of elements that -- /do not satisfy/ the predicate. The second element of the tuple is the -- remainder of the sequence. -- -- @'break' p@ is equivalent to @'span' ('not' . p)@ -- -- @ -- > 'break' (> 3) ('fromList' [1,2,3,4,1,2,3,4] :: 'Vector' 'Int') -- (fromList [1,2,3],fromList [4,1,2,3,4]) -- -- > 'break' (< 'z') ('fromList' "abc" :: 'Text') -- ("","abc") -- -- > 'break' (> 'z') ('fromList' "abc" :: 'Text') -- ("abc","") -- @ break :: (Element seq -> Bool) -> seq -> (seq, seq) break f = (fromList *** fromList) . List.break f . otoList -- | 'span' applies a predicate to a sequence, and returns a tuple where -- the first element is the longest prefix (possibly empty) that -- /does satisfy/ the predicate. The second element of the tuple is the -- remainder of the sequence. -- -- @'span' p xs@ is equivalent to @('takeWhile' p xs, 'dropWhile' p xs)@ -- -- @ -- > 'span' (< 3) ('fromList' [1,2,3,4,1,2,3,4] :: 'Vector' 'Int') -- (fromList [1,2],fromList [3,4,1,2,3,4]) -- -- > 'span' (< 'z') ('fromList' "abc" :: 'Text') -- ("abc","") -- -- > 'span' (< 0) [1,2,3] -- ([],[1,2,3]) -- @ span :: (Element seq -> Bool) -> seq -> (seq, seq) span f = (fromList *** fromList) . List.span f . otoList -- | 'dropWhile' returns the suffix remaining after 'takeWhile'. -- -- @ -- > 'dropWhile' (< 3) [1,2,3,4,5,1,2,3] -- [3,4,5,1,2,3] -- -- > 'dropWhile' (< 'z') ('fromList' "abc" :: 'Text') -- "" -- @ dropWhile :: (Element seq -> Bool) -> seq -> seq dropWhile f = fromList . List.dropWhile f . otoList -- | 'takeWhile' applies a predicate to a sequence, and returns the -- longest prefix (possibly empty) of the sequence of elements that -- /satisfy/ the predicate. -- -- @ -- > 'takeWhile' (< 3) [1,2,3,4,5,1,2,3] -- [1,2] -- -- > 'takeWhile' (< 'z') ('fromList' "abc" :: 'Text') -- "abc" -- @ takeWhile :: (Element seq -> Bool) -> seq -> seq takeWhile f = fromList . List.takeWhile f . otoList -- | @'splitAt' n se@ returns a tuple where the first element is the prefix of -- the sequence @se@ with length @n@, and the second element is the remainder of -- the sequence. -- -- @ -- > 'splitAt' 6 "Hello world!" -- ("Hello ","world!") -- -- > 'splitAt' 3 ('fromList' [1,2,3,4,5] :: 'Vector' 'Int') -- (fromList [1,2,3],fromList [4,5]) -- @ splitAt :: Index seq -> seq -> (seq, seq) splitAt i = (fromList *** fromList) . List.genericSplitAt i . otoList -- | Equivalent to 'splitAt'. unsafeSplitAt :: Index seq -> seq -> (seq, seq) unsafeSplitAt i seq = (unsafeTake i seq, unsafeDrop i seq) -- | @'take' n@ returns the prefix of a sequence of length @n@, or the -- sequence itself if @n > 'olength' seq@. -- -- @ -- > 'take' 3 "abcdefg" -- "abc" -- > 'take' 4 ('fromList' [1,2,3,4,5,6] :: 'Vector' 'Int') -- fromList [1,2,3,4] -- @ take :: Index seq -> seq -> seq take i = fst . splitAt i -- | Equivalent to 'take'. unsafeTake :: Index seq -> seq -> seq unsafeTake = take -- | @'drop' n@ returns the suffix of a sequence after the first @n@ -- elements, or an empty sequence if @n > 'olength' seq@. -- -- @ -- > 'drop' 3 "abcdefg" -- "defg" -- > 'drop' 4 ('fromList' [1,2,3,4,5,6] :: 'Vector' 'Int') -- fromList [5,6] -- @ drop :: Index seq -> seq -> seq drop i = snd . splitAt i -- | Equivalent to 'drop' unsafeDrop :: Index seq -> seq -> seq unsafeDrop = drop -- | Same as 'drop' but drops from the end of the sequence instead. -- -- @ -- > 'dropEnd' 3 "abcdefg" -- "abcd" -- > 'dropEnd' 4 ('fromList' [1,2,3,4,5,6] :: 'Vector' 'Int') -- fromList [1,2] -- @ -- -- @since 1.0.4.0 dropEnd :: Index seq -> seq -> seq dropEnd i s = fst $ splitAt (lengthIndex s - i) s -- | 'partition' takes a predicate and a sequence and returns the pair of -- sequences of elements which do and do not satisfy the predicate. -- -- @ -- 'partition' p se = ('filter' p se, 'filter' ('not' . p) se) -- @ partition :: (Element seq -> Bool) -> seq -> (seq, seq) partition f = (fromList *** fromList) . List.partition f . otoList -- | 'uncons' returns the tuple of the first element of a sequence and the rest -- of the sequence, or 'Nothing' if the sequence is empty. -- -- @ -- > 'uncons' ('fromList' [1,2,3,4] :: 'Vector' 'Int') -- 'Just' (1,fromList [2,3,4]) -- -- > 'uncons' ([] :: ['Int']) -- 'Nothing' -- @ uncons :: seq -> Maybe (Element seq, seq) uncons = fmap (second fromList) . uncons . otoList -- | 'unsnoc' returns the tuple of the init of a sequence and the last element, -- or 'Nothing' if the sequence is empty. -- -- @ -- > 'unsnoc' ('fromList' [1,2,3,4] :: 'Vector' 'Int') -- 'Just' (fromList [1,2,3],4) -- -- > 'unsnoc' ([] :: ['Int']) -- 'Nothing' -- @ unsnoc :: seq -> Maybe (seq, Element seq) unsnoc = fmap (first fromList) . unsnoc . otoList -- | 'filter' given a predicate returns a sequence of all elements that satisfy -- the predicate. -- -- @ -- > 'filter' (< 5) [1 .. 10] -- [1,2,3,4] -- @ filter :: (Element seq -> Bool) -> seq -> seq filter f = fromList . List.filter f . otoList -- | The monadic version of 'filter'. filterM :: Monad m => (Element seq -> m Bool) -> seq -> m seq filterM f = liftM fromList . filterM f . otoList -- replicates are not in SemiSequence to allow for zero -- | @'replicate' n x@ is a sequence of length @n@ with @x@ as the -- value of every element. -- -- @ -- > 'replicate' 10 'a' :: Text -- "aaaaaaaaaa" -- @ replicate :: Index seq -> Element seq -> seq replicate i = fromList . List.genericReplicate i -- | The monadic version of 'replicateM'. replicateM :: Monad m => Index seq -> m (Element seq) -> m seq replicateM i = liftM fromList . Control.Monad.replicateM (fromIntegral i) -- below functions are not in SemiSequence because they return a List (instead of NonEmpty) -- | 'group' takes a sequence and returns a list of sequences such that the -- concatenation of the result is equal to the argument. Each subsequence in -- the result contains only equal elements, using the supplied equality test. -- -- @ -- > 'groupBy' (==) "Mississippi" -- ["M","i","ss","i","ss","i","pp","i"] -- @ groupBy :: (Element seq -> Element seq -> Bool) -> seq -> [seq] groupBy f = fmap fromList . List.groupBy f . otoList -- | Similar to standard 'groupBy', but operates on the whole collection, -- not just the consecutive items. groupAllOn :: Eq b => (Element seq -> b) -> seq -> [seq] groupAllOn f = fmap fromList . groupAllOn f . otoList -- | 'subsequences' returns a list of all subsequences of the argument. -- -- @ -- > 'subsequences' "abc" -- ["","a","b","ab","c","ac","bc","abc"] -- @ subsequences :: seq -> [seq] subsequences = List.map fromList . List.subsequences . otoList -- | 'permutations' returns a list of all permutations of the argument. -- -- @ -- > 'permutations' "abc" -- ["abc","bac","cba","bca","cab","acb"] -- @ permutations :: seq -> [seq] permutations = List.map fromList . List.permutations . otoList -- | __Unsafe__ -- -- Get the tail of a sequence, throw an exception if the sequence is empty. -- -- @ -- > 'tailEx' [1,2,3] -- [2,3] -- @ tailEx :: seq -> seq tailEx = snd . maybe (error "Data.Sequences.tailEx") id . uncons -- | Safe version of 'tailEx'. -- -- Returns 'Nothing' instead of throwing an exception when encountering -- an empty monomorphic container. -- -- @since 1.0.0 tailMay :: seq -> Maybe seq tailMay seq | onull seq = Nothing | otherwise = Just (tailEx seq) {-# INLINE tailMay #-} -- | __Unsafe__ -- -- Get the init of a sequence, throw an exception if the sequence is empty. -- -- @ -- > 'initEx' [1,2,3] -- [1,2] -- @ initEx :: seq -> seq initEx = fst . maybe (error "Data.Sequences.initEx") id . unsnoc -- | Safe version of 'initEx'. -- -- Returns 'Nothing' instead of throwing an exception when encountering -- an empty monomorphic container. -- -- @since 1.0.0 initMay :: IsSequence seq => seq -> Maybe seq initMay seq | onull seq = Nothing | otherwise = Just (initEx seq) {-# INLINE initMay #-} -- | Equivalent to 'tailEx'. unsafeTail :: seq -> seq unsafeTail = tailEx -- | Equivalent to 'initEx'. unsafeInit :: seq -> seq unsafeInit = initEx -- | Get the element of a sequence at a certain index, returns 'Nothing' -- if that index does not exist. -- -- @ -- > 'index' ('fromList' [1,2,3] :: 'Vector' 'Int') 1 -- 'Just' 2 -- > 'index' ('fromList' [1,2,3] :: 'Vector' 'Int') 4 -- 'Nothing' -- @ index :: seq -> Index seq -> Maybe (Element seq) index seq' idx = headMay (drop idx seq') -- | __Unsafe__ -- -- Get the element of a sequence at a certain index, throws an exception -- if the index does not exist. indexEx :: seq -> Index seq -> Element seq indexEx seq' idx = maybe (error "Data.Sequences.indexEx") id (index seq' idx) -- | Equivalent to 'indexEx'. unsafeIndex :: seq -> Index seq -> Element seq unsafeIndex = indexEx -- | 'splitWhen' splits a sequence into components delimited by separators, -- where the predicate returns True for a separator element. The resulting -- components do not contain the separators. Two adjacent separators result -- in an empty component in the output. The number of resulting components -- is greater by one than number of separators. -- -- Since 0.9.3 splitWhen :: (Element seq -> Bool) -> seq -> [seq] splitWhen = defaultSplitWhen {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE unsafeSplitAt #-} {-# INLINE take #-} {-# INLINE unsafeTake #-} {-# INLINE drop #-} {-# INLINE unsafeDrop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE filterM #-} {-# INLINE replicate #-} {-# INLINE replicateM #-} {-# INLINE groupBy #-} {-# INLINE groupAllOn #-} {-# INLINE subsequences #-} {-# INLINE permutations #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE unsafeTail #-} {-# INLINE unsafeInit #-} {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} {-# INLINE splitWhen #-} -- | Use "Data.List"'s implementation of 'Data.List.find'. defaultFind :: MonoFoldable seq => (Element seq -> Bool) -> seq -> Maybe (Element seq) defaultFind f = List.find f . otoList {-# INLINE defaultFind #-} -- | Use "Data.List"'s implementation of 'Data.List.intersperse'. defaultIntersperse :: IsSequence seq => Element seq -> seq -> seq defaultIntersperse e = fromList . List.intersperse e . otoList {-# INLINE defaultIntersperse #-} -- | Use "Data.List"'s implementation of 'Data.List.reverse'. defaultReverse :: IsSequence seq => seq -> seq defaultReverse = fromList . List.reverse . otoList {-# INLINE defaultReverse #-} -- | Use "Data.List"'s implementation of 'Data.List.sortBy'. defaultSortBy :: IsSequence seq => (Element seq -> Element seq -> Ordering) -> seq -> seq defaultSortBy f = fromList . sortBy f . otoList {-# INLINE defaultSortBy #-} -- | Use 'splitWhen' from "Data.List.Split" defaultSplitWhen :: IsSequence seq => (Element seq -> Bool) -> seq -> [seq] defaultSplitWhen f = List.map fromList . List.splitWhen f . otoList {-# INLINE defaultSplitWhen #-} -- | Sort a vector using an supplied element ordering function. vectorSortBy :: VG.Vector v e => (e -> e -> Ordering) -> v e -> v e vectorSortBy f = VG.modify (VAM.sortBy f) {-# INLINE vectorSortBy #-} -- | Sort a vector. vectorSort :: (VG.Vector v e, Ord e) => v e -> v e vectorSort = VG.modify VAM.sort {-# INLINE vectorSort #-} -- | Use "Data.List"'s 'Data.List.:' to prepend an element to a sequence. defaultCons :: IsSequence seq => Element seq -> seq -> seq defaultCons e = fromList . (e:) . otoList {-# INLINE defaultCons #-} -- | Use "Data.List"'s 'Data.List.++' to append an element to a sequence. defaultSnoc :: IsSequence seq => seq -> Element seq -> seq defaultSnoc seq e = fromList (otoList seq List.++ [e]) {-# INLINE defaultSnoc #-} -- | like Data.List.tail, but an input of 'mempty' returns 'mempty' tailDef :: IsSequence seq => seq -> seq tailDef xs = case uncons xs of Nothing -> mempty Just tuple -> snd tuple {-# INLINE tailDef #-} -- | like Data.List.init, but an input of 'mempty' returns 'mempty' initDef :: IsSequence seq => seq -> seq initDef xs = case unsnoc xs of Nothing -> mempty Just tuple -> fst tuple {-# INLINE initDef #-} instance SemiSequence [a] where type Index [a] = Int intersperse = List.intersperse reverse = List.reverse find = List.find sortBy f = V.toList . sortBy f . V.fromList cons = (:) snoc = defaultSnoc {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence [a] where fromList = id lengthIndex = List.length filter = List.filter filterM = Control.Monad.filterM break = List.break span = List.span dropWhile = List.dropWhile takeWhile = List.takeWhile splitAt = List.splitAt take = List.take drop = List.drop uncons [] = Nothing uncons (x:xs) = Just (x, xs) unsnoc [] = Nothing unsnoc (x0:xs0) = Just (loop id x0 xs0) where loop front x [] = (front [], x) loop front x (y:z) = loop (front . (x:)) y z partition = List.partition replicate = List.replicate replicateM = Control.Monad.replicateM groupBy = List.groupBy groupAllOn f (head : tail) = (head : matches) : groupAllOn f nonMatches where (matches, nonMatches) = partition ((== f head) . f) tail groupAllOn _ [] = [] splitWhen = List.splitWhen {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE drop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE filterM #-} {-# INLINE replicate #-} {-# INLINE replicateM #-} {-# INLINE groupBy #-} {-# INLINE groupAllOn #-} {-# INLINE splitWhen #-} instance SemiSequence (NE.NonEmpty a) where type Index (NE.NonEmpty a) = Int intersperse = NE.intersperse reverse = NE.reverse find x = find x . NE.toList cons = NE.cons snoc xs x = NE.fromList $ flip snoc x $ NE.toList xs sortBy f = NE.fromList . sortBy f . NE.toList {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance SemiSequence S.ByteString where type Index S.ByteString = Int intersperse = S.intersperse reverse = S.reverse find = S.find cons = S.cons snoc = S.snoc sortBy = defaultSortBy {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence S.ByteString where fromList = S.pack lengthIndex = S.length replicate = S.replicate filter = S.filter break = S.break span = S.span dropWhile = S.dropWhile takeWhile = S.takeWhile splitAt = S.splitAt take = S.take unsafeTake = SU.unsafeTake drop = S.drop unsafeDrop = SU.unsafeDrop partition = S.partition uncons = S.uncons unsnoc s | S.null s = Nothing | otherwise = Just (S.init s, S.last s) groupBy = S.groupBy tailEx = S.tail initEx = S.init unsafeTail = SU.unsafeTail splitWhen f s | S.null s = [S.empty] | otherwise = S.splitWith f s {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE unsafeTake #-} {-# INLINE drop #-} {-# INLINE unsafeDrop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE replicate #-} {-# INLINE groupBy #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE unsafeTail #-} {-# INLINE splitWhen #-} index bs i | i >= S.length bs = Nothing | otherwise = Just (S.index bs i) indexEx = S.index unsafeIndex = SU.unsafeIndex {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance SemiSequence T.Text where type Index T.Text = Int intersperse = T.intersperse reverse = T.reverse find = T.find cons = T.cons snoc = T.snoc sortBy = defaultSortBy {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence T.Text where fromList = T.pack lengthIndex = T.length replicate i c = T.replicate i (T.singleton c) filter = T.filter break = T.break span = T.span dropWhile = T.dropWhile takeWhile = T.takeWhile splitAt = T.splitAt take = T.take drop = T.drop dropEnd = T.dropEnd partition = T.partition uncons = T.uncons unsnoc t | T.null t = Nothing | otherwise = Just (T.init t, T.last t) groupBy = T.groupBy tailEx = T.tail initEx = T.init splitWhen = T.split {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE drop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE replicate #-} {-# INLINE groupBy #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE splitWhen #-} index t i | i >= T.length t = Nothing | otherwise = Just (T.index t i) indexEx = T.index unsafeIndex = T.index {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance SemiSequence L.ByteString where type Index L.ByteString = Int64 intersperse = L.intersperse reverse = L.reverse find = L.find cons = L.cons snoc = L.snoc sortBy = defaultSortBy {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence L.ByteString where fromList = L.pack lengthIndex = L.length replicate = L.replicate filter = L.filter break = L.break span = L.span dropWhile = L.dropWhile takeWhile = L.takeWhile splitAt = L.splitAt take = L.take drop = L.drop partition = L.partition uncons = L.uncons unsnoc s | L.null s = Nothing | otherwise = Just (L.init s, L.last s) groupBy = L.groupBy tailEx = L.tail initEx = L.init splitWhen f s | L.null s = [L.empty] | otherwise = L.splitWith f s {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE drop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE replicate #-} {-# INLINE groupBy #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE splitWhen #-} indexEx = L.index unsafeIndex = L.index {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance SemiSequence TL.Text where type Index TL.Text = Int64 intersperse = TL.intersperse reverse = TL.reverse find = TL.find cons = TL.cons snoc = TL.snoc sortBy = defaultSortBy {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence TL.Text where fromList = TL.pack lengthIndex = TL.length replicate i c = TL.replicate i (TL.singleton c) filter = TL.filter break = TL.break span = TL.span dropWhile = TL.dropWhile takeWhile = TL.takeWhile splitAt = TL.splitAt take = TL.take drop = TL.drop partition = TL.partition uncons = TL.uncons unsnoc t | TL.null t = Nothing | otherwise = Just (TL.init t, TL.last t) groupBy = TL.groupBy tailEx = TL.tail initEx = TL.init splitWhen = TL.split {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE drop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE replicate #-} {-# INLINE groupBy #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE splitWhen #-} indexEx = TL.index unsafeIndex = TL.index {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance SemiSequence (Seq.Seq a) where type Index (Seq.Seq a) = Int cons = (Seq.<|) snoc = (Seq.|>) reverse = Seq.reverse sortBy = Seq.sortBy intersperse = defaultIntersperse find = defaultFind {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence (Seq.Seq a) where fromList = Seq.fromList lengthIndex = Seq.length replicate = Seq.replicate replicateM = Seq.replicateM filter = Seq.filter --filterM = Seq.filterM break = Seq.breakl span = Seq.spanl dropWhile = Seq.dropWhileL takeWhile = Seq.takeWhileL splitAt = Seq.splitAt take = Seq.take drop = Seq.drop partition = Seq.partition uncons s = case Seq.viewl s of Seq.EmptyL -> Nothing x Seq.:< xs -> Just (x, xs) unsnoc s = case Seq.viewr s of Seq.EmptyR -> Nothing xs Seq.:> x -> Just (xs, x) --groupBy = Seq.groupBy tailEx = Seq.drop 1 initEx xs = Seq.take (Seq.length xs - 1) xs {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE drop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE replicate #-} {-# INLINE replicateM #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} index seq' i | i >= Seq.length seq' = Nothing | otherwise = Just (Seq.index seq' i) indexEx = Seq.index unsafeIndex = Seq.index {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance SemiSequence (V.Vector a) where type Index (V.Vector a) = Int reverse = V.reverse find = V.find cons = V.cons snoc = V.snoc sortBy = vectorSortBy intersperse = defaultIntersperse {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance IsSequence (V.Vector a) where fromList = V.fromList lengthIndex = V.length replicate = V.replicate replicateM = V.replicateM filter = V.filter filterM = V.filterM break = V.break span = V.span dropWhile = V.dropWhile takeWhile = V.takeWhile splitAt = V.splitAt take = V.take drop = V.drop unsafeTake = V.unsafeTake unsafeDrop = V.unsafeDrop partition = V.partition uncons v | V.null v = Nothing | otherwise = Just (V.head v, V.tail v) unsnoc v | V.null v = Nothing | otherwise = Just (V.init v, V.last v) --groupBy = V.groupBy tailEx = V.tail initEx = V.init unsafeTail = V.unsafeTail unsafeInit = V.unsafeInit {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE unsafeTake #-} {-# INLINE drop #-} {-# INLINE unsafeDrop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE filterM #-} {-# INLINE replicate #-} {-# INLINE replicateM #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE unsafeTail #-} {-# INLINE unsafeInit #-} index v i | i >= V.length v = Nothing | otherwise = Just (v V.! i) indexEx = (V.!) unsafeIndex = V.unsafeIndex {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance U.Unbox a => SemiSequence (U.Vector a) where type Index (U.Vector a) = Int intersperse = defaultIntersperse reverse = U.reverse find = U.find cons = U.cons snoc = U.snoc sortBy = vectorSortBy {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance U.Unbox a => IsSequence (U.Vector a) where fromList = U.fromList lengthIndex = U.length replicate = U.replicate replicateM = U.replicateM filter = U.filter filterM = U.filterM break = U.break span = U.span dropWhile = U.dropWhile takeWhile = U.takeWhile splitAt = U.splitAt take = U.take drop = U.drop unsafeTake = U.unsafeTake unsafeDrop = U.unsafeDrop partition = U.partition uncons v | U.null v = Nothing | otherwise = Just (U.head v, U.tail v) unsnoc v | U.null v = Nothing | otherwise = Just (U.init v, U.last v) --groupBy = U.groupBy tailEx = U.tail initEx = U.init unsafeTail = U.unsafeTail unsafeInit = U.unsafeInit {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE unsafeTake #-} {-# INLINE drop #-} {-# INLINE unsafeDrop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE filterM #-} {-# INLINE replicate #-} {-# INLINE replicateM #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE unsafeTail #-} {-# INLINE unsafeInit #-} index v i | i >= U.length v = Nothing | otherwise = Just (v U.! i) indexEx = (U.!) unsafeIndex = U.unsafeIndex {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} instance VS.Storable a => SemiSequence (VS.Vector a) where type Index (VS.Vector a) = Int reverse = VS.reverse find = VS.find cons = VS.cons snoc = VS.snoc intersperse = defaultIntersperse sortBy = vectorSortBy {-# INLINE intersperse #-} {-# INLINE reverse #-} {-# INLINE find #-} {-# INLINE sortBy #-} {-# INLINE cons #-} {-# INLINE snoc #-} instance VS.Storable a => IsSequence (VS.Vector a) where fromList = VS.fromList lengthIndex = VS.length replicate = VS.replicate replicateM = VS.replicateM filter = VS.filter filterM = VS.filterM break = VS.break span = VS.span dropWhile = VS.dropWhile takeWhile = VS.takeWhile splitAt = VS.splitAt take = VS.take drop = VS.drop unsafeTake = VS.unsafeTake unsafeDrop = VS.unsafeDrop partition = VS.partition uncons v | VS.null v = Nothing | otherwise = Just (VS.head v, VS.tail v) unsnoc v | VS.null v = Nothing | otherwise = Just (VS.init v, VS.last v) --groupBy = U.groupBy tailEx = VS.tail initEx = VS.init unsafeTail = VS.unsafeTail unsafeInit = VS.unsafeInit {-# INLINE fromList #-} {-# INLINE break #-} {-# INLINE span #-} {-# INLINE dropWhile #-} {-# INLINE takeWhile #-} {-# INLINE splitAt #-} {-# INLINE take #-} {-# INLINE unsafeTake #-} {-# INLINE drop #-} {-# INLINE unsafeDrop #-} {-# INLINE partition #-} {-# INLINE uncons #-} {-# INLINE unsnoc #-} {-# INLINE filter #-} {-# INLINE filterM #-} {-# INLINE replicate #-} {-# INLINE replicateM #-} {-# INLINE tailEx #-} {-# INLINE initEx #-} {-# INLINE unsafeTail #-} {-# INLINE unsafeInit #-} index v i | i >= VS.length v = Nothing | otherwise = Just (v VS.! i) indexEx = (VS.!) unsafeIndex = VS.unsafeIndex {-# INLINE index #-} {-# INLINE indexEx #-} {-# INLINE unsafeIndex #-} -- | @'splitElem'@ splits a sequence into components delimited by separator -- element. It's equivalent to 'splitWhen' with equality predicate: -- -- > splitElem sep === splitWhen (== sep) -- -- Since 0.9.3 splitElem :: (IsSequence seq, Eq (Element seq)) => Element seq -> seq -> [seq] splitElem x = splitWhen (== x) -- | @'splitSeq'@ splits a sequence into components delimited by -- separator subsequence. 'splitSeq' is the right inverse of 'intercalate': -- -- > ointercalate x . splitSeq x === id -- -- 'splitElem' can be considered a special case of 'splitSeq' -- -- > splitSeq (singleton sep) === splitElem sep -- -- @'splitSeq' mempty@ is another special case: it splits just before each -- element, and in line with 'splitWhen' rules, it has at least one output -- component: -- -- @ -- > 'splitSeq' "" "" -- [""] -- > 'splitSeq' "" "a" -- ["", "a"] -- > 'splitSeq' "" "ab" -- ["", "a", "b"] -- @ -- -- Since 0.9.3 splitSeq :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> [seq] splitSeq sep = List.map fromList . List.splitOn (otoList sep) . otoList -- | @'replaceSeq' old new@ replaces all @old@ subsequences with @new@. -- -- > replaceSeq old new === ointercalate new . splitSeq old -- -- @since 1.0.1 replaceSeq :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> seq -> seq replaceSeq old new = ointercalate new . splitSeq old -- | 'stripPrefix' drops the given prefix from a sequence. -- It returns 'Nothing' if the sequence did not start with the prefix -- given, or 'Just' the sequence after the prefix, if it does. -- -- @ -- > 'stripPrefix' "foo" "foobar" -- 'Just' "bar" -- > 'stripPrefix' "abc" "foobar" -- 'Nothing' -- @ stripPrefix :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> Maybe seq stripPrefix x y = fmap fromList (otoList x `List.stripPrefix` otoList y) -- | 'stripSuffix' drops the given suffix from a sequence. -- It returns 'Nothing' if the sequence did not end with the suffix -- given, or 'Just' the sequence before the suffix, if it does. -- -- @ -- > 'stripSuffix' "bar" "foobar" -- 'Just' "foo" -- > 'stripSuffix' "abc" "foobar" -- 'Nothing' -- @ stripSuffix :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> Maybe seq stripSuffix x y = fmap fromList (otoList x `stripSuffixList` otoList y) where stripSuffixList :: Eq a => [a] -> [a] -> Maybe [a] stripSuffixList x' y' = fmap reverse (stripPrefix (reverse x') (reverse y')) -- | 'ensurePrefix' will add a prefix to a sequence if it doesn't -- exist, and otherwise have no effect. -- -- @ -- > 'ensurePrefix' "foo" "foobar" -- "foobar" -- > 'ensurePrefix' "abc" "foobar" -- "abcfoobar" -- @ -- -- @since 1.0.3 ensurePrefix :: (Eq (Element seq), IsSequence seq) => seq -> seq -> seq ensurePrefix prefix seq = if isPrefixOf prefix seq then seq else prefix <> seq -- | Append a suffix to a sequence, unless it already has that suffix. -- -- @ -- > 'ensureSuffix' "bar" "foobar" -- "foobar" -- > 'ensureSuffix' "abc" "foobar" -- "foobarabc" -- @ -- -- @since 1.0.3 ensureSuffix :: (Eq (Element seq), IsSequence seq) => seq -> seq -> seq ensureSuffix suffix seq = if isSuffixOf suffix seq then seq else seq <> suffix -- | 'isPrefixOf' takes two sequences and returns 'True' if the first -- sequence is a prefix of the second. isPrefixOf :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> Bool isPrefixOf x y = otoList x `List.isPrefixOf` otoList y -- | 'isSuffixOf' takes two sequences and returns 'True' if the first -- sequence is a suffix of the second. isSuffixOf :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> Bool isSuffixOf x y = otoList x `List.isSuffixOf` otoList y -- | 'isInfixOf' takes two sequences and returns 'true' if the first -- sequence is contained, wholly and intact, anywhere within the second. isInfixOf :: (IsSequence seq, Eq (Element seq)) => seq -> seq -> Bool isInfixOf x y = otoList x `List.isInfixOf` otoList y -- | Equivalent to @'groupBy' (==)@ group :: (IsSequence seq, Eq (Element seq)) => seq -> [seq] group = groupBy (==) -- | Similar to standard 'group', but operates on the whole collection, -- not just the consecutive items. -- -- Equivalent to @'groupAllOn' id@ groupAll :: (IsSequence seq, Eq (Element seq)) => seq -> [seq] groupAll = groupAllOn id -- | -- -- @since 0.10.2 delete :: (IsSequence seq, Eq (Element seq)) => Element seq -> seq -> seq delete = deleteBy (==) -- | -- -- @since 0.10.2 deleteBy :: (IsSequence seq, Eq (Element seq)) => (Element seq -> Element seq -> Bool) -> Element seq -> seq -> seq deleteBy eq x = fromList . List.deleteBy eq x . otoList {-# INLINE [0] splitElem #-} {-# INLINE [0] splitSeq #-} {-# INLINE [0] replaceSeq #-} {-# INLINE [0] isPrefixOf #-} {-# INLINE [0] isSuffixOf #-} {-# INLINE [0] isInfixOf #-} {-# INLINE [0] stripPrefix #-} {-# INLINE [0] stripSuffix #-} {-# INLINE [0] group #-} {-# INLINE [0] groupAll #-} {-# INLINE [0] delete #-} {-# INLINE [0] deleteBy #-} {-# RULES "list splitSeq" splitSeq = List.splitOn #-} {-# RULES "list stripPrefix" stripPrefix = List.stripPrefix #-} {-# RULES "list isPrefixOf" isPrefixOf = List.isPrefixOf #-} {-# RULES "list isSuffixOf" isSuffixOf = List.isSuffixOf #-} {-# RULES "list isInfixOf" isInfixOf = List.isInfixOf #-} {-# RULES "list delete" delete = List.delete #-} {-# RULES "list deleteBy" deleteBy = List.deleteBy #-} {-# RULES "strict ByteString splitElem" splitElem = splitElemStrictBS #-} {-# RULES "strict ByteString stripPrefix" stripPrefix = stripPrefixStrictBS #-} {-# RULES "strict ByteString stripSuffix" stripSuffix = stripSuffixStrictBS #-} {-# RULES "strict ByteString group" group = S.group #-} {-# RULES "strict ByteString isPrefixOf" isPrefixOf = S.isPrefixOf #-} {-# RULES "strict ByteString isSuffixOf" isSuffixOf = S.isSuffixOf #-} {-# RULES "strict ByteString isInfixOf" isInfixOf = S.isInfixOf #-} splitElemStrictBS :: Word8 -> S.ByteString -> [S.ByteString] splitElemStrictBS sep s | S.null s = [S.empty] | otherwise = S.split sep s stripPrefixStrictBS :: S.ByteString -> S.ByteString -> Maybe S.ByteString stripPrefixStrictBS x y | x `S.isPrefixOf` y = Just (S.drop (S.length x) y) | otherwise = Nothing stripSuffixStrictBS :: S.ByteString -> S.ByteString -> Maybe S.ByteString stripSuffixStrictBS x y | x `S.isSuffixOf` y = Just (S.take (S.length y - S.length x) y) | otherwise = Nothing {-# RULES "lazy ByteString splitElem" splitElem = splitSeqLazyBS #-} {-# RULES "lazy ByteString stripPrefix" stripPrefix = stripPrefixLazyBS #-} {-# RULES "lazy ByteString stripSuffix" stripSuffix = stripSuffixLazyBS #-} {-# RULES "lazy ByteString group" group = L.group #-} {-# RULES "lazy ByteString isPrefixOf" isPrefixOf = L.isPrefixOf #-} {-# RULES "lazy ByteString isSuffixOf" isSuffixOf = L.isSuffixOf #-} splitSeqLazyBS :: Word8 -> L.ByteString -> [L.ByteString] splitSeqLazyBS sep s | L.null s = [L.empty] | otherwise = L.split sep s stripPrefixLazyBS :: L.ByteString -> L.ByteString -> Maybe L.ByteString stripPrefixLazyBS x y | x `L.isPrefixOf` y = Just (L.drop (L.length x) y) | otherwise = Nothing stripSuffixLazyBS :: L.ByteString -> L.ByteString -> Maybe L.ByteString stripSuffixLazyBS x y | x `L.isSuffixOf` y = Just (L.take (L.length y - L.length x) y) | otherwise = Nothing {-# RULES "strict Text splitSeq" splitSeq = splitSeqStrictText #-} {-# RULES "strict Text replaceSeq" replaceSeq = replaceSeqStrictText #-} {-# RULES "strict Text stripPrefix" stripPrefix = T.stripPrefix #-} {-# RULES "strict Text stripSuffix" stripSuffix = T.stripSuffix #-} {-# RULES "strict Text group" group = T.group #-} {-# RULES "strict Text isPrefixOf" isPrefixOf = T.isPrefixOf #-} {-# RULES "strict Text isSuffixOf" isSuffixOf = T.isSuffixOf #-} {-# RULES "strict Text isInfixOf" isInfixOf = T.isInfixOf #-} splitSeqStrictText :: T.Text -> T.Text -> [T.Text] splitSeqStrictText sep | T.null sep = (:) T.empty . List.map singleton . T.unpack | otherwise = T.splitOn sep replaceSeqStrictText :: T.Text -> T.Text -> T.Text -> T.Text replaceSeqStrictText old new | T.null old = T.intercalate new . splitSeqStrictText old | otherwise = T.replace old new {-# RULES "lazy Text splitSeq" splitSeq = splitSeqLazyText #-} {-# RULES "lazy Text replaceSeq" replaceSeq = replaceSeqLazyText #-} {-# RULES "lazy Text stripPrefix" stripPrefix = TL.stripPrefix #-} {-# RULES "lazy Text stripSuffix" stripSuffix = TL.stripSuffix #-} {-# RULES "lazy Text group" group = TL.group #-} {-# RULES "lazy Text isPrefixOf" isPrefixOf = TL.isPrefixOf #-} {-# RULES "lazy Text isSuffixOf" isSuffixOf = TL.isSuffixOf #-} {-# RULES "lazy Text isInfixOf" isInfixOf = TL.isInfixOf #-} splitSeqLazyText :: TL.Text -> TL.Text -> [TL.Text] splitSeqLazyText sep | TL.null sep = (:) TL.empty . List.map singleton . TL.unpack | otherwise = TL.splitOn sep replaceSeqLazyText :: TL.Text -> TL.Text -> TL.Text -> TL.Text replaceSeqLazyText old new | TL.null old = TL.intercalate new . splitSeqLazyText old | otherwise = TL.replace old new -- | Sort a ordered sequence. -- -- @ -- > 'sort' [4,3,1,2] -- [1,2,3,4] -- @ sort :: (IsSequence seq, Ord (Element seq)) => seq -> seq sort = fromList . V.toList . vectorSort . V.fromList . otoList {-# INLINE [0] sort #-} {-# RULES "strict ByteString sort" sort = S.sort #-} {-# RULES "boxed Vector sort" forall (v :: V.Vector a). sort v = vectorSort v #-} {-# RULES "unboxed Vector sort" forall (v :: U.Unbox a => U.Vector a). sort v = vectorSort v #-} {-# RULES "storable Vector sort" forall (v :: VS.Storable a => VS.Vector a). sort v = vectorSort v #-} -- | A typeclass for sequences whose elements are 'Char's. class (IsSequence t, IsString t, Element t ~ Char) => Textual t where -- | Break up a textual sequence into a list of words, which were delimited -- by white space. -- -- @ -- > 'words' "abc def ghi" -- ["abc","def","ghi"] -- @ words :: t -> [t] -- | Join a list of textual sequences using seperating spaces. -- -- @ -- > 'unwords' ["abc","def","ghi"] -- "abc def ghi" -- @ unwords :: (Element seq ~ t, MonoFoldable seq) => seq -> t -- | Break up a textual sequence at newline characters. -- -- -- @ -- > 'lines' "hello\\nworld" -- ["hello","world"] -- @ lines :: t -> [t] -- | Join a list of textual sequences using newlines. -- -- @ -- > 'unlines' ["abc","def","ghi"] -- "abc\\ndef\\nghi" -- @ unlines :: (Element seq ~ t, MonoFoldable seq) => seq -> t -- | Convert a textual sequence to lower-case. -- -- @ -- > 'toLower' "HELLO WORLD" -- "hello world" -- @ toLower :: t -> t -- | Convert a textual sequence to upper-case. -- -- @ -- > 'toUpper' "hello world" -- "HELLO WORLD" -- @ toUpper :: t -> t -- | Convert a textual sequence to folded-case. -- -- Slightly different from 'toLower', see @"Data.Text".'Data.Text.toCaseFold'@ toCaseFold :: t -> t -- | Split a textual sequence into two parts, split at the first space. -- -- @ -- > 'breakWord' "hello world" -- ("hello","world") -- @ breakWord :: t -> (t, t) breakWord = fmap (dropWhile isSpace) . break isSpace {-# INLINE breakWord #-} -- | Split a textual sequence into two parts, split at the newline. -- -- @ -- > 'breakLine' "abc\\ndef" -- ("abc","def") -- @ breakLine :: t -> (t, t) breakLine = (killCR *** drop 1) . break (== '\n') where killCR t = case unsnoc t of Just (t', '\r') -> t' _ -> t instance (c ~ Char) => Textual [c] where words = List.words unwords = List.unwords . otoList lines = List.lines unlines = List.unlines . otoList toLower = TL.unpack . TL.toLower . TL.pack toUpper = TL.unpack . TL.toUpper . TL.pack toCaseFold = TL.unpack . TL.toCaseFold . TL.pack {-# INLINE words #-} {-# INLINE unwords #-} {-# INLINE lines #-} {-# INLINE unlines #-} {-# INLINE toLower #-} {-# INLINE toUpper #-} {-# INLINE toCaseFold #-} instance Textual T.Text where words = T.words unwords = T.unwords . otoList lines = T.lines unlines = T.unlines . otoList toLower = T.toLower toUpper = T.toUpper toCaseFold = T.toCaseFold {-# INLINE words #-} {-# INLINE unwords #-} {-# INLINE lines #-} {-# INLINE unlines #-} {-# INLINE toLower #-} {-# INLINE toUpper #-} {-# INLINE toCaseFold #-} instance Textual TL.Text where words = TL.words unwords = TL.unwords . otoList lines = TL.lines unlines = TL.unlines . otoList toLower = TL.toLower toUpper = TL.toUpper toCaseFold = TL.toCaseFold {-# INLINE words #-} {-# INLINE unwords #-} {-# INLINE lines #-} {-# INLINE unlines #-} {-# INLINE toLower #-} {-# INLINE toUpper #-} {-# INLINE toCaseFold #-} -- | Takes all of the `Just` values from a sequence of @Maybe t@s and -- concatenates them into an unboxed sequence of @t@s. -- -- Since 0.6.2 catMaybes :: (IsSequence (f (Maybe t)), Functor f, Element (f (Maybe t)) ~ Maybe t) => f (Maybe t) -> f t catMaybes = fmap fromJust . filter isJust -- | Same as @sortBy . comparing@. -- -- Since 0.7.0 sortOn :: (Ord o, SemiSequence seq) => (Element seq -> o) -> seq -> seq sortOn = sortBy . comparing {-# INLINE sortOn #-} -- | Lazy sequences containing strict chunks of data. -- -- @since 1.0.0 class (IsSequence lazy, IsSequence strict) => LazySequence lazy strict | lazy -> strict, strict -> lazy where toChunks :: lazy -> [strict] fromChunks :: [strict] -> lazy toStrict :: lazy -> strict fromStrict :: strict -> lazy instance LazySequence L.ByteString S.ByteString where toChunks = L.toChunks fromChunks = L.fromChunks toStrict = S.concat . L.toChunks fromStrict = L.fromChunks . return instance LazySequence TL.Text T.Text where toChunks = TL.toChunks fromChunks = TL.fromChunks toStrict = TL.toStrict fromStrict = TL.fromStrict -- | Synonym for 'fromList' -- -- @since 1.0.0 pack :: IsSequence seq => [Element seq] -> seq pack = fromList {-# INLINE pack #-} -- | Synonym for 'otoList' -- -- @since 1.0.0 unpack :: MonoFoldable mono => mono -> [Element mono] unpack = otoList {-# INLINE unpack #-} -- | Repack from one type to another, dropping to a list in the middle. -- -- @repack = pack . unpack@. -- -- @since 1.0.0 repack :: (MonoFoldable a, IsSequence b, Element a ~ Element b) => a -> b repack = pack . unpack -- | Textual data which can be encoded to and decoded from UTF8. -- -- @since 1.0.0 class (Textual textual, IsSequence binary) => Utf8 textual binary | textual -> binary, binary -> textual where -- | Encode from textual to binary using UTF-8 encoding -- -- @since 1.0.0 encodeUtf8 :: textual -> binary -- | Note that this function is required to be pure. In the case of -- a decoding error, Unicode replacement characters must be used. -- -- @since 1.0.0 decodeUtf8 :: binary -> textual instance (c ~ Char, w ~ Word8) => Utf8 [c] [w] where encodeUtf8 = L.unpack . TL.encodeUtf8 . TL.pack decodeUtf8 = TL.unpack . TL.decodeUtf8With lenientDecode . L.pack instance Utf8 T.Text S.ByteString where encodeUtf8 = T.encodeUtf8 decodeUtf8 = T.decodeUtf8With lenientDecode instance Utf8 TL.Text L.ByteString where encodeUtf8 = TL.encodeUtf8 decodeUtf8 = TL.decodeUtf8With lenientDecode