@@ -3,9 +3,6 @@
3#if __GLASGOW_HASKELL__ >= 702
3#if __GLASGOW_HASKELL__ >= 702
4{-# LANGUAGE Trustworthy #-}
4{-# LANGUAGE Trustworthy #-}
6−#if __GLASGOW_HASKELL__ >= 708
7−{-# LANGUAGE TypeFamilies #-}
11-- Module : Data.Text
8-- Module : Data.Text
@@ -14,7 +11,8 @@
14-- (c) 2008, 2009 Tom Harper
11-- (c) 2008, 2009 Tom Harper
16-- License : BSD-style
13-- License : BSD-style
17−-- Maintainer : bos@serpentine.com
14+-- Maintainer : bos@serpentine.com, rtomharper@googlemail.com,
18-- Stability : experimental
16-- Stability : experimental
19-- Portability : GHC
17-- Portability : GHC
@@ -32,8 +30,8 @@
33-- To use an extended and very rich family of functions for working
31-- To use an extended and very rich family of functions for working
34-- with Unicode text (including normalization, regular expressions,
32-- with Unicode text (including normalization, regular expressions,
35−-- non-standard encodings, text breaking, and locales), see
33+-- non-standard encodings, text breaking, and locales), see the
36−-- <http://hackage.haskell.org/package/text-icu the text-icu package >.
34+-- @text-icu@ package: <http://hackage.haskell.org/package/text-icu>
38module Data.Text
36module Data.Text
@@ -81,7 +79,6 @@ module Data.Text
81 , toCaseFold
79 , toCaseFold
86 -- ** Justification
83 -- ** Justification
87 , justifyLeft
84 , justifyLeft
@@ -125,11 +122,8 @@ module Data.Text
126 -- ** Breaking strings
123 -- ** Breaking strings
131 , takeWhile
126 , takeWhile
133 , dropWhile
127 , dropWhile
134 , dropWhileEnd
128 , dropWhileEnd
135 , dropAround
129 , dropAround
@@ -192,94 +186,82 @@ module Data.Text
193 -- * Low level operations
187 -- * Low level operations
198import Prelude (Char, Bool(..), Int, Maybe(..), String,
191import Prelude (Char, Bool(..), Int, Maybe(..), String,
199 Eq(..), Ord(..), Ordering(..), (++),
192 Eq(..), Ord(..), Ordering(..), (++),
200− Read(..),
193+ Read(..), Show(..),
201− (&&), (||), (+), (-), (.), ($), ($!), (>>),
194+ (&&), (||), (+), (-), (.), ($), ($!), (>>), (*),
202− not, return, otherwise, quot)
195+ maxBound, not, return, otherwise, quot)
203#if defined(HAVE_DEEPSEQ)
196#if defined(HAVE_DEEPSEQ)
204−import Control.DeepSeq (NFData(rnf))
197+import Control.DeepSeq (NFData)
206#if defined(ASSERTS)
199#if defined(ASSERTS)
207import Control.Exception (assert)
200import Control.Exception (assert)
209import Data.Char (isSpace)
202import Data.Char (isSpace)
210−import Data.Data (Data(gfoldl, toConstr, gunfold, dataTypeOf), constrIndex,
203+import Data.Data (Data(gfoldl, toConstr, gunfold, dataTypeOf))
211− Constr, mkConstr, DataType, mkDataType, Fixity(Prefix))
204+import Data.Data (mkNoRepType)
212import Control.Monad (foldM)
205import Control.Monad (foldM)
213−import Control.Monad.ST (ST)
214import qualified Data.Text.Array as A
206import qualified Data.Text.Array as A
215import qualified Data.List as L
207import qualified Data.List as L
216−import Data.Binary (Binary(get, put))
217import Data.Monoid (Monoid(..))
208import Data.Monoid (Monoid(..))
218−#if MIN_VERSION_base(4,9,0)
219−import Data.Semigroup (Semigroup(..))
221import Data.String (IsString(..))
209import Data.String (IsString(..))
222−import qualified Data.Text.Internal.Fusion as S
210+import qualified Data.Text.Fusion as S
223−import qualified Data.Text.Internal.Fusion.Common as S
211+import qualified Data.Text.Fusion.Common as S
224−import Data.Text.Encoding (decodeUtf8', encodeUtf8)
225−import Data.Text.Internal.Fusion (stream, reverseStream, unstream)
212+import Data.Text.Fusion (stream, reverseStream, unstream)
226−import Data.Text.Internal.Private (span_)
213+import Data.Text.Private (span_)
227−import Data.Text.Internal (Text(..), empty, firstf, mul, safe, text)
214+import Data.Text.Internal (Text(..), empty, firstf, safe, text, textP)
228−import Data.Text.Show (singleton, unpack, unpackCString#)
229import qualified Prelude as P
215import qualified Prelude as P
230import Data.Text.Unsafe (Iter(..), iter, iter_, lengthWord16, reverseIter,
216import Data.Text.Unsafe (Iter(..), iter, iter_, lengthWord16, reverseIter,
231− reverseIter_, unsafeHead, unsafeTail)
217+ unsafeHead, unsafeTail)
232−import Data.Text.Internal.Unsafe.Char (unsafeChr)
218+import Data.Text.UnsafeChar (unsafeChr)
233−import qualified Data.Text.Internal.Functions as F
219+import qualified Data.Text.Util as U
234−import qualified Data.Text.Internal.Encoding.Utf16 as U16
220+import qualified Data.Text.Encoding.Utf16 as U16
235−import Data.Text.Internal.Search (indices)
221+import Data.Text.Search (indices)
236#if defined(__HADDOCK__)
222#if defined(__HADDOCK__)
237import Data.ByteString (ByteString)
223import Data.ByteString (ByteString)
238import qualified Data.Text.Lazy as L
224import qualified Data.Text.Lazy as L
239import Data.Int (Int64)
225import Data.Int (Int64)
241−import GHC.Base (eqInt, neInt, gtInt, geInt, ltInt, leInt)
242−#if __GLASGOW_HASKELL__ >= 708
227+#if __GLASGOW_HASKELL__ >= 702
243−import qualified GHC.Exts as Exts
228+import qualified GHC.CString as GHC
245−#if MIN_VERSION_base(4,7,0)
230+import qualified GHC.Base as GHC
246−import Text.Printf (PrintfArg, formatArg, formatString)
232+import GHC.Prim (Addr#)
249-- $strict
234-- $strict
251-- This package provides both strict and lazy 'Text' types. The
236-- This package provides both strict and lazy 'Text' types. The
252−-- strict type is provided by the "Data.Text" module, while the lazy
237+-- strict type is provided by the 'Data.Text' package, while the lazy
253−-- type is provided by the "Data.Text.Lazy" module. Internally, the
238+-- type is provided by the 'Data.Text.Lazy' package. Internally, the
254-- lazy @Text@ type consists of a list of strict chunks.
239-- lazy @Text@ type consists of a list of strict chunks.
256-- The strict 'Text' type requires that an entire string fit into
241-- The strict 'Text' type requires that an entire string fit into
257−-- memory at once. The lazy 'Data.Text.Lazy.Text' type is capable of
242+-- memory at once. The lazy @Text@ type is capable of streaming
258−-- streaming strings that are larger than memory using a small memory
243+-- strings that are larger than memory using a small memory footprint.
259−-- footprint. In many cases, the overhead of chunked streaming makes
244+-- In many cases, the overhead of chunked streaming makes the lazy
260−-- the lazy 'Data.Text.Lazy.Text' type slower than its strict
245+-- @Text@ type slower than its strict counterpart, but this is not
261−-- counterpart, but this is not always the case. Sometimes, the time
246+-- always the case. Sometimes, the time complexity of a function in
262−-- complexity of a function in one module may be different from the
247+-- one module may be different from the other, due to their differing
263−-- other, due to their differing internal structures.
248+-- internal structures.
265-- Each module provides an almost identical API, with the main
250-- Each module provides an almost identical API, with the main
266-- difference being that the strict module uses 'Int' values for
251-- difference being that the strict module uses 'Int' values for
267−-- lengths and counts, while the lazy module uses 'Data.Int.Int64'
252+-- lengths and counts, while the lazy module uses 'Int64' lengths.
270-- $replacement
254-- $replacement
272-- A 'Text' value is a sequence of Unicode scalar values, as defined
256-- A 'Text' value is a sequence of Unicode scalar values, as defined
274−-- <http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#page=35 §3.9, definition D76 of the Unicode 5.2 standard >.
257+-- in §3.9, definition D76 of the Unicode 5.2 standard:
258+-- <http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#page=35>. As
275−-- As such, a 'Text' cannot contain values in the range U+D800 to
259+-- such, a 'Text' cannot contain values in the range U+D800 to U+DFFF
276−-- U+DFFF inclusive. Haskell implementations admit all Unicode code
260+-- inclusive. Haskell implementations admit all Unicode code points
278−-- (<http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#page=13 §3.4, definition D10 >)
279−-- as 'Char' values, including code points from this invalid range.
261+-- (§3.4, definition D10) as 'Char' values, including code points
280−-- This means that there are some 'Char' values that are not valid
262+-- from this invalid range. This means that there are some 'Char'
281−-- Unicode scalar values, and the functions in this module must handle
263+-- values that are not valid Unicode scalar values, and the functions
282−-- those cases.
264+-- in this module must handle those cases.
284-- Within this module, many functions construct a 'Text' from one or
266-- Within this module, many functions construct a 'Text' from one or
285-- more 'Char' values. Those functions will substitute 'Char' values
267-- more 'Char' values. Those functions will substitute 'Char' values
@@ -293,8 +275,8 @@ import Text.Printf (PrintfArg, formatArg, formatString)
293-- range U+D800 through U+DFFF are used by UTF-16 to denote surrogate
275-- range U+D800 through U+DFFF are used by UTF-16 to denote surrogate
294-- code points, and so cannot be represented. The functions replace
276-- code points, and so cannot be represented. The functions replace
295-- invalid scalar values, instead of dropping them, as a security
277-- invalid scalar values, instead of dropping them, as a security
296−-- measure. For details, see
278+-- measure. For details, see Unicode Technical Report 36, §3.5:
297−-- <http://unicode.org/reports/tr36/#Deletion_of_Noncharacters Unicode Technical Report 36, §3.5 >.)
279+-- <http://unicode.org/reports/tr36/#Deletion_of_Noncharacters>)
299-- $fusion
281-- $fusion
@@ -312,11 +294,11 @@ import Text.Printf (PrintfArg, formatArg, formatString)
312-- > countChars = T.length . T.toUpper . E.decodeUtf8
294-- > countChars = T.length . T.toUpper . E.decodeUtf8
314-- From the type signatures involved, this looks like it should
296-- From the type signatures involved, this looks like it should
315−-- allocate one 'Data.ByteString.ByteString' value, and two 'Text'
297+-- allocate one 'ByteString' value, and two 'Text' values. However,
316−-- values. However, when a module is compiled with optimisation
298+-- when a module is compiled with optimisation enabled under GHC, the
317−-- enabled under GHC, the two intermediate 'Text' values will be
299+-- two intermediate 'Text' values will be optimised away, and the
318−-- optimised away, and the function will be compiled down to a single
300+-- function will be compiled down to a single loop over the source
319−-- loop over the source 'Data.ByteString.ByteString'.
301+-- 'ByteString'.
321-- Functions that can be fused by the compiler are documented with the
303-- Functions that can be fused by the compiler are documented with the
322-- phrase \"Subject to fusion\".
304-- phrase \"Subject to fusion\".
@@ -330,82 +312,41 @@ instance Eq Text where
330instance Ord Text where
312instance Ord Text where
331 compare = compareText
313 compare = compareText
315+instance Show Text where
316+ showsPrec p ps r = showsPrec p (unpack ps) r
333instance Read Text where
318instance Read Text where
334 readsPrec p str = [(pack x,y) | (x,y) <- readsPrec p str]
319 readsPrec p str = [(pack x,y) | (x,y) <- readsPrec p str]
336−#if MIN_VERSION_base(4,9,0)
337−-- Semigroup orphan instances for older GHCs are provided by
338−-- 'semigroups` package
340−instance Semigroup Text where
344instance Monoid Text where
321instance Monoid Text where
345 mempty = empty
322 mempty = empty
346−#if MIN_VERSION_base(4,9,0)
347− mappend = (<>) -- future-proof definition
349 mappend = append
323 mappend = append
351 mconcat = concat
324 mconcat = concat
353instance IsString Text where
326instance IsString Text where
354 fromString = pack
327 fromString = pack
356−#if __GLASGOW_HASKELL__ >= 708
357−instance Exts.IsList Text where
358− type Item Text = Char
363#if defined(HAVE_DEEPSEQ)
329#if defined(HAVE_DEEPSEQ)
364−instance NFData Text where rnf !_ = ()
330+instance NFData Text
367−instance Binary Text where
368− put t = put (encodeUtf8 t)
371− case decodeUtf8' bs of
372− P.Left exn -> P.fail (P.show exn)
373− P.Right a -> P.return a
375−-- | This instance preserves data abstraction at the cost of inefficiency.
333+-- This instance preserves data abstraction at the cost of inefficiency.
376-- We omit reflection services for the sake of data abstraction.
334-- We omit reflection services for the sake of data abstraction.
378−-- This instance was created by copying the updated behavior of
336+-- This instance was created by copying the behavior of Data.Set and
379−-- @"Data.Set".@'Data.Set.Set' and @"Data.Map".@'Data.Map.Map'. If you
380−-- feel a mistake has been made, please feel free to submit
337+-- Data.Map. If you feel a mistake has been made, please feel free to
381−-- improvements.
338+-- submit improvements.
383−-- The original discussion is archived here:
384−-- <http://groups.google.com/group/haskell-cafe/browse_thread/thread/b5bbb1b28a7e525d/0639d46852575b93 could we get a Data instance for Data.Text.Text? >
386−-- The followup discussion that changed the behavior of 'Data.Set.Set'
387−-- and 'Data.Map.Map' is archived here:
340+-- Original discussion is archived here:
388−-- <http://markmail.org/message/trovdc6zkphyi3cr#query:+page:1+mid:a46der3iacwjcf6n+state:results Proposal: Allow gunfold for Data.Map, ... >
341+
342+-- "could we get a Data instance for Data.Text.Text?"
343+-- http://groups.google.com/group/haskell-cafe/browse_thread/thread/b5bbb1b28a7e525d/0639d46852575b93
390instance Data Text where
345instance Data Text where
391 gfoldl f z txt = z pack `f` (unpack txt)
346 gfoldl f z txt = z pack `f` (unpack txt)
392− toConstr _ = packConstr
347+ toConstr _ = P.error "Data.Text.Text.toConstr"
393− gunfold k z c = case constrIndex c of
395− _ -> P.error "gunfold"
348+ gunfold _ _ = P.error "Data.Text.Text.gunfold"
396− dataTypeOf _ = textDataType
349+ dataTypeOf _ = mkNoRepType "Data.Text.Text"
398−#if MIN_VERSION_base(4,7,0)
399−-- | Only defined for @base-4.7.0.0@ and later
400−instance PrintfArg Text where
401− formatArg txt = formatString $ unpack txt
405−packConstr = mkConstr textDataType "pack" [] Prefix
407−textDataType :: DataType
408−textDataType = mkDataType "Data.Text.Text" [packConstr]
410-- | /O(n)/ Compare two 'Text' values lexicographically.
351-- | /O(n)/ Compare two 'Text' values lexicographically.
411compareText :: Text -> Text -> Ordering
352compareText :: Text -> Text -> Ordering
@@ -430,6 +371,30 @@ pack :: String -> Text
430pack = unstream . S.map safe . S.streamList
371pack = unstream . S.map safe . S.streamList
431{-# INLINE [1] pack #-}
372{-# INLINE [1] pack #-}
374+-- | /O(n)/ Convert a Text into a String. Subject to fusion.
375+unpack :: Text -> String
376+unpack = S.unstreamList . stream
377+{-# INLINE [1] unpack #-}
379+-- | /O(n)/ Convert a literal string into a Text. Subject to fusion.
380+unpackCString# :: Addr# -> Text
381+unpackCString# addr# = unstream (S.streamCString# addr#)
382+{-# NOINLINE unpackCString# #-}
384+{-# RULES "TEXT literal" forall a.
385+ unstream (S.map safe (S.streamList (GHC.unpackCString# a)))
386+ = unpackCString# a #-}
388+{-# RULES "TEXT literal UTF8" forall a.
389+ unstream (S.map safe (S.streamList (GHC.unpackCStringUtf8# a)))
390+ = unpackCString# a #-}
392+-- | /O(1)/ Convert a character into a Text. Subject to fusion.
393+-- Performs replacement on invalid scalar values.
394+singleton :: Char -> Text
395+singleton = unstream . S.singleton . safe
396+{-# INLINE [1] singleton #-}
433-- -----------------------------------------------------------------------------
398-- -----------------------------------------------------------------------------
434-- * Basic functions
399-- * Basic functions
@@ -460,13 +425,12 @@ append a@(Text arr1 off1 len1) b@(Text arr2 off2 len2)
460 | otherwise = overflowError "append"
425 | otherwise = overflowError "append"
462 len = len1+len2
427 len = len1+len2
463− x :: ST s (A.MArray s)
465 arr <- A.new len
429 arr <- A.new len
466 A.copyI arr 0 arr1 off1 len1
430 A.copyI arr 0 arr1 off1 len1
467 A.copyI arr len1 arr2 off2 len
431 A.copyI arr len1 arr2 off2 len
468 return arr
432 return arr
469−{-# NOINLINE append #-}
433+{-# INLINE append #-}
472"TEXT append -> fused" [~1] forall t1 t2.
436"TEXT append -> fused" [~1] forall t1 t2.
@@ -486,8 +450,8 @@ head t = S.head (stream t)
486uncons :: Text -> Maybe (Char, Text)
450uncons :: Text -> Maybe (Char, Text)
487uncons t@(Text arr off len)
451uncons t@(Text arr off len)
488 | len <= 0 = Nothing
452 | len <= 0 = Nothing
489− | otherwise = Just $ let !(Iter c d) = iter t 0
490− in (c, text arr (off+d) (len-d))
453+ | otherwise = Just (c, textP arr (off+d) (len-d))
454+ where Iter c d = iter t 0
491{-# INLINE [1] uncons #-}
455{-# INLINE [1] uncons #-}
493-- | Lifted from Control.Arrow and specialized.
457-- | Lifted from Control.Arrow and specialized.
@@ -517,7 +481,7 @@ last (Text arr off len)
517tail :: Text -> Text
481tail :: Text -> Text
518tail t@(Text arr off len)
482tail t@(Text arr off len)
519 | len <= 0 = emptyError "tail"
483 | len <= 0 = emptyError "tail"
520− | otherwise = text arr (off+d) (len-d)
484+ | otherwise = textP arr (off+d) (len-d)
521 where d = iter_ t 0
485 where d = iter_ t 0
522{-# INLINE [1] tail #-}
486{-# INLINE [1] tail #-}
@@ -532,8 +496,8 @@ tail t@(Text arr off len)
532-- be non-empty. Subject to fusion.
496-- be non-empty. Subject to fusion.
533init :: Text -> Text
497init :: Text -> Text
534init (Text arr off len) | len <= 0 = emptyError "init"
498init (Text arr off len) | len <= 0 = emptyError "init"
535− | n >= 0xDC00 && n <= 0xDFFF = text arr off (len-2)
499+ | n >= 0xDC00 && n <= 0xDFFF = textP arr off (len-2)
536− | otherwise = text arr off (len-1)
500+ | otherwise = textP arr off (len-1)
538 n = A.unsafeIndex arr (off+len-1)
502 n = A.unsafeIndex arr (off+len-1)
539{-# INLINE [1] init #-}
503{-# INLINE [1] init #-}
@@ -572,9 +536,7 @@ isSingleton = S.isSingleton . stream
572-- Subject to fusion.
536-- Subject to fusion.
573length :: Text -> Int
537length :: Text -> Int
574length t = S.length (stream t)
538length t = S.length (stream t)
575−{-# INLINE [0] length #-}
539+{-# INLINE length #-}
576−-- length needs to be phased after the compareN/length rules otherwise
577−-- it may inline before the rules have an opportunity to fire.
579-- | /O(n)/ Compare the count of characters in a 'Text' to a number.
541-- | /O(n)/ Compare the count of characters in a 'Text' to a number.
580-- Subject to fusion.
542-- Subject to fusion.
@@ -593,32 +555,32 @@ compareLength t n = S.compareLengthI (stream t) n
595"TEXT ==N/length -> compareLength/==EQ" [~1] forall t n.
557"TEXT ==N/length -> compareLength/==EQ" [~1] forall t n.
596− eqInt (length t) n = compareLength t n == EQ
558+ (==) (length t) n = compareLength t n == EQ
600"TEXT /=N/length -> compareLength//=EQ" [~1] forall t n.
562"TEXT /=N/length -> compareLength//=EQ" [~1] forall t n.
601− neInt (length t) n = compareLength t n /= EQ
563+ (/=) (length t) n = compareLength t n /= EQ
605"TEXT <N/length -> compareLength/==LT" [~1] forall t n.
567"TEXT <N/length -> compareLength/==LT" [~1] forall t n.
606− ltInt (length t) n = compareLength t n == LT
568+ (<) (length t) n = compareLength t n == LT
610"TEXT <=N/length -> compareLength//=GT" [~1] forall t n.
572"TEXT <=N/length -> compareLength//=GT" [~1] forall t n.
611− leInt (length t) n = compareLength t n /= GT
573+ (<=) (length t) n = compareLength t n /= GT
615"TEXT >N/length -> compareLength/==GT" [~1] forall t n.
577"TEXT >N/length -> compareLength/==GT" [~1] forall t n.
616− gtInt (length t) n = compareLength t n == GT
578+ (>) (length t) n = compareLength t n == GT
620"TEXT >=N/length -> compareLength//=LT" [~1] forall t n.
582"TEXT >=N/length -> compareLength//=LT" [~1] forall t n.
621− geInt (length t) n = compareLength t n /= LT
583+ (>=) (length t) n = compareLength t n /= LT
624-- -----------------------------------------------------------------------------
586-- -----------------------------------------------------------------------------
@@ -634,7 +596,7 @@ map f t = unstream (S.map (safe . f) (stream t))
634-- 'Text's and concatenates the list after interspersing the first
596-- 'Text's and concatenates the list after interspersing the first
635-- argument between each element of the list.
597-- argument between each element of the list.
636intercalate :: Text -> [Text] -> Text
598intercalate :: Text -> [Text] -> Text
637−intercalate t = concat . (F.intersperse t)
599+intercalate t = concat . (U.intersperse t)
638{-# INLINE intercalate #-}
600{-# INLINE intercalate #-}
640-- | /O(n)/ The 'intersperse' function takes a character and places it
602-- | /O(n)/ The 'intersperse' function takes a character and places it
@@ -649,59 +611,16 @@ reverse :: Text -> Text
649reverse t = S.reverse (stream t)
611reverse t = S.reverse (stream t)
650{-# INLINE reverse #-}
612{-# INLINE reverse #-}
652−-- | /O(m+n)/ Replace every non-overlapping occurrence of @needle@ in
614+-- | /O(m+n)/ Replace every occurrence of one substring with another.
653−-- @haystack@ with @replacement@.
655−-- This function behaves as though it was defined as follows:
658−-- replace needle replacement haystack =
659−-- 'intercalate' replacement ('splitOn' needle haystack)
662−-- As this suggests, each occurrence is replaced exactly once. So if
663−-- @needle@ occurs in @replacement@, that occurrence will /not/ itself
664−-- be replaced recursively:
666−-- > replace "oo" "foo" "oo" == "foo"
668−-- In cases where several instances of @needle@ overlap, only the
669−-- first one will be replaced:
671−-- > replace "ofo" "bar" "ofofo" == "barfo"
673-- In (unlikely) bad cases, this function's time complexity degrades
616-- In (unlikely) bad cases, this function's time complexity degrades
674-- towards /O(n*m)/.
617-- towards /O(n*m)/.
675−replace :: Text
618+replace :: Text -- ^ Text to search for
676− -- ^ @needle@ to search for. If this string is empty, an
619+ -> Text -- ^ Replacement text
677− -- error will occur.
679− -- ^ @replacement@ to replace @needle@ with.
680− -> Text
620+ -> Text -- ^ Input text
681− -- ^ @haystack@ in which to search.
683−replace needle@(Text _ _ neeLen)
622+replace s d = intercalate d . splitOn s
684− (Text repArr repOff repLen)
623+{-# INLINE replace #-}
685− haystack@(Text hayArr hayOff hayLen)
686− | neeLen == 0 = emptyError "replace"
687− | L.null ixs = haystack
688− | len > 0 = Text (A.run x) 0 len
691− ixs = indices needle haystack
692− len = hayLen - (neeLen - repLen) `mul` L.length ixs
693− x :: ST s (A.MArray s)
696− let loop (i:is) o d = do
699− A.copyI marr d hayArr (hayOff+o) d0
700− A.copyI marr d0 repArr repOff d1
701− loop is (i + neeLen) d1
702− loop [] o d = A.copyI marr d hayArr (hayOff+o) len
706-- ----------------------------------------------------------------------------
625-- ----------------------------------------------------------------------------
707-- ** Case conversions (folds)
626-- ** Case conversions (folds)
@@ -720,13 +639,13 @@ replace needle@(Text _ _ neeLen)
720-- /Note/: In some languages, case conversion is a locale- and
639-- /Note/: In some languages, case conversion is a locale- and
721-- context-dependent operation. The case conversion functions in this
640-- context-dependent operation. The case conversion functions in this
722-- module are /not/ locale sensitive. Programs that require locale
641-- module are /not/ locale sensitive. Programs that require locale
723−-- sensitivity should use appropriate versions of the
642+-- sensitivity should use appropriate versions of the case mapping
643+-- functions from the @text-icu@ package:
724−-- <http://hackage.haskell.org/package/text-icu-0.6.3.7/docs/Data-Text-ICU.html#g:4 case mapping functions from the text-icu package >.
644+-- <http://hackage.haskell.org/package/text-icu>
726−-- | /O(n)/ Convert a string to folded case. Subject to fusion.
646+-- | /O(n)/ Convert a string to folded case. This function is mainly
728−-- This function is mainly useful for performing caseless (also known
647+-- useful for performing caseless (also known as case insensitive)
729−-- as case insensitive) string comparisons.
648+-- string comparisons.
731-- A string @x@ is a caseless match for a string @y@ if and only if:
650-- A string @x@ is a caseless match for a string @y@ if and only if:
@@ -741,51 +660,25 @@ replace needle@(Text _ _ neeLen)
741-- instead of itself.
660-- instead of itself.
742toCaseFold :: Text -> Text
661toCaseFold :: Text -> Text
743toCaseFold t = unstream (S.toCaseFold (stream t))
662toCaseFold t = unstream (S.toCaseFold (stream t))
744−{-# INLINE toCaseFold #-}
663+{-# INLINE [0] toCaseFold #-}
746-- | /O(n)/ Convert a string to lower case, using simple case
665-- | /O(n)/ Convert a string to lower case, using simple case
747−-- conversion. Subject to fusion.
749−-- The result string may be longer than the input string. For
666+-- conversion. The result string may be longer than the input string.
750−-- instance, \"İ\" (Latin capital letter I with dot above,
667+-- For instance, \"İ\" (Latin capital letter I with dot above,
751−-- U+0130) maps to the sequence \"i\" (Latin small letter i, U+0069)
668+-- U+0130) maps to the sequence \"i\" (Latin small letter i, U+0069) followed
752−-- followed by \" ̇\" (combining dot above, U+0307).
669+-- by \" ̇\" (combining dot above, U+0307).
753toLower :: Text -> Text
670toLower :: Text -> Text
754toLower t = unstream (S.toLower (stream t))
671toLower t = unstream (S.toLower (stream t))
755{-# INLINE toLower #-}
672{-# INLINE toLower #-}
757-- | /O(n)/ Convert a string to upper case, using simple case
674-- | /O(n)/ Convert a string to upper case, using simple case
758−-- conversion. Subject to fusion.
760−-- The result string may be longer than the input string. For
675+-- conversion. The result string may be longer than the input string.
761−-- instance, the German \"ß\" (eszett, U+00DF) maps to the
676+-- For instance, the German \"ß\" (eszett, U+00DF) maps to the
762-- two-letter sequence \"SS\".
677-- two-letter sequence \"SS\".
763toUpper :: Text -> Text
678toUpper :: Text -> Text
764toUpper t = unstream (S.toUpper (stream t))
679toUpper t = unstream (S.toUpper (stream t))
765{-# INLINE toUpper #-}
680{-# INLINE toUpper #-}
767−-- | /O(n)/ Convert a string to title case, using simple case
768−-- conversion. Subject to fusion.
770−-- The first letter of the input is converted to title case, as is
771−-- every subsequent letter that immediately follows a non-letter.
772−-- Every letter that immediately follows another letter is converted
775−-- The result string may be longer than the input string. For example,
776−-- the Latin small ligature fl (U+FB02) is converted to the
777−-- sequence Latin capital letter F (U+0046) followed by Latin small
778−-- letter l (U+006C).
780−-- /Note/: this function does not take language or culture specific
781−-- rules into account. For instance, in English, different style
782−-- guides disagree on whether the book name \"The Hill of the Red
783−-- Fox\" is correctly title cased—but this function will
784−-- capitalize /every/ word.
785−toTitle :: Text -> Text
786−toTitle t = unstream (S.toTitle (stream t))
787−{-# INLINE toTitle #-}
789-- | /O(n)/ Left-justify a string to the given length, using the
682-- | /O(n)/ Left-justify a string to the given length, using the
790-- specified fill character on the right. Subject to fusion.
683-- specified fill character on the right. Subject to fusion.
791-- Performs replacement on invalid scalar values.
684-- Performs replacement on invalid scalar values.
@@ -901,7 +794,6 @@ concat ts = case ts' of
902 ts' = L.filter (not . null) ts
795 ts' = L.filter (not . null) ts
903 len = sumP "concat" $ L.map lengthWord16 ts'
796 len = sumP "concat" $ L.map lengthWord16 ts'
904− go :: ST s (A.MArray s)
906 arr <- A.new len
798 arr <- A.new len
907 let step i (Text a o l) =
799 let step i (Text a o l) =
@@ -915,13 +807,13 @@ concatMap f = concat . foldr ((:) . f) []
915{-# INLINE concatMap #-}
807{-# INLINE concatMap #-}
917-- | /O(n)/ 'any' @p@ @t@ determines whether any character in the
809-- | /O(n)/ 'any' @p@ @t@ determines whether any character in the
918−-- 'Text' @t@ satisfies the predicate @p@. Subject to fusion.
810+-- 'Text' @t@ satisifes the predicate @p@. Subject to fusion.
919any :: (Char -> Bool) -> Text -> Bool
811any :: (Char -> Bool) -> Text -> Bool
920any p t = S.any p (stream t)
812any p t = S.any p (stream t)
921{-# INLINE any #-}
813{-# INLINE any #-}
923-- | /O(n)/ 'all' @p@ @t@ determines whether all characters in the
815-- | /O(n)/ 'all' @p@ @t@ determines whether all characters in the
924−-- 'Text' @t@ satisfy the predicate @p@. Subject to fusion.
816+-- 'Text' @t@ satisify the predicate @p@. Subject to fusion.
925all :: (Char -> Bool) -> Text -> Bool
817all :: (Char -> Bool) -> Text -> Bool
926all p t = S.all p (stream t)
818all p t = S.all p (stream t)
927{-# INLINE all #-}
819{-# INLINE all #-}
@@ -1012,10 +904,10 @@ replicate n t@(Text a o l)
1012 | n <= 0 || l <= 0 = empty
904 | n <= 0 || l <= 0 = empty
1013 | n == 1 = t
905 | n == 1 = t
1014 | isSingleton t = replicateChar n (unsafeHead t)
906 | isSingleton t = replicateChar n (unsafeHead t)
1015− | otherwise = Text (A.run x) 0 len
907+ | n <= maxBound `quot` l = Text (A.run x) 0 len
908+ | otherwise = overflowError "replicate"
1017− len = l `mul` n
910+ len = l * n
1018− x :: ST s (A.MArray s)
1020 arr <- A.new len
912 arr <- A.new len
1021 let loop !d !i | i >= n = return arr
913 let loop !d !i | i >= n = return arr
@@ -1066,16 +958,14 @@ take :: Int -> Text -> Text
1066take n t@(Text arr off len)
958take n t@(Text arr off len)
1067 | n <= 0 = empty
959 | n <= 0 = empty
1068 | n >= len = t
960 | n >= len = t
1069− | otherwise = text arr off (iterN n t)
961+ | otherwise = Text arr off (loop 0 0)
964+ | i >= len || cnt >= n = i
965+ | otherwise = loop (i+d) (cnt+1)
1070{-# INLINE [1] take #-}
967{-# INLINE [1] take #-}
1072−iterN :: Int -> Text -> Int
1073−iterN n t@(Text _arr _off len) = loop 0 0
1075− | i >= len || cnt >= n = i
1076− | otherwise = loop (i+d) (cnt+1)
1077− where d = iter_ t i
1079{-# RULES
969{-# RULES
1080"TEXT take -> fused" [~1] forall n t.
970"TEXT take -> fused" [~1] forall n t.
1081 take n t = unstream (S.take n (stream t))
971 take n t = unstream (S.take n (stream t))
@@ -1083,27 +973,6 @@ iterN n t@(Text _arr _off len) = loop 0 0
1083 unstream (S.take n (stream t)) = take n t
973 unstream (S.take n (stream t)) = take n t
1086−-- | /O(n)/ 'takeEnd' @n@ @t@ returns the suffix remaining after
1087−-- taking @n@ characters from the end of @t@.
1091−-- > takeEnd 3 "foobar" == "bar"
1092−takeEnd :: Int -> Text -> Text
1093−takeEnd n t@(Text arr off len)
1096− | otherwise = text arr (off+i) (len-i)
1097− where i = iterNEnd n t
1099−iterNEnd :: Int -> Text -> Int
1100−iterNEnd n t@(Text _arr _off len) = loop (len-1) n
1104− | otherwise = loop (i+d) (m-1)
1105− where d = reverseIter_ t i
1107-- | /O(n)/ 'drop' @n@, applied to a 'Text', returns the suffix of the
976-- | /O(n)/ 'drop' @n@, applied to a 'Text', returns the suffix of the
1108-- 'Text' after the first @n@ characters, or the empty 'Text' if @n@
977-- 'Text' after the first @n@ characters, or the empty 'Text' if @n@
1109-- is greater than the length of the 'Text'. Subject to fusion.
978-- is greater than the length of the 'Text'. Subject to fusion.
@@ -1111,8 +980,11 @@ drop :: Int -> Text -> Text
1111drop n t@(Text arr off len)
980drop n t@(Text arr off len)
1112 | n <= 0 = t
981 | n <= 0 = t
1113 | n >= len = empty
982 | n >= len = empty
1114− | otherwise = text arr (off+i) (len-i)
983+ | otherwise = loop 0 0
1115− where i = iterN n t
984+ where loop !i !cnt
985+ | i >= len || cnt >= n = Text arr (off+i) (len-i)
986+ | otherwise = loop (i+d) (cnt+1)
1116{-# INLINE [1] drop #-}
988{-# INLINE [1] drop #-}
1118{-# RULES
990{-# RULES
@@ -1122,18 +994,6 @@ drop n t@(Text arr off len)
1122 unstream (S.drop n (stream t)) = drop n t
994 unstream (S.drop n (stream t)) = drop n t
1125−-- | /O(n)/ 'dropEnd' @n@ @t@ returns the prefix remaining after
1126−-- dropping @n@ characters from the end of @t@.
1130−-- > dropEnd 3 "foobar" == "foo"
1131−dropEnd :: Int -> Text -> Text
1132−dropEnd n t@(Text arr off len)
1135− | otherwise = text arr off (iterNEnd n t)
1137-- | /O(n)/ 'takeWhile', applied to a predicate @p@ and a 'Text',
997-- | /O(n)/ 'takeWhile', applied to a predicate @p@ and a 'Text',
1138-- returns the longest prefix (possibly empty) of elements that
998-- returns the longest prefix (possibly empty) of elements that
1139-- satisfy @p@. Subject to fusion.
999-- satisfy @p@. Subject to fusion.
@@ -1141,7 +1001,7 @@ takeWhile :: (Char -> Bool) -> Text -> Text
1141takeWhile p t@(Text arr off len) = loop 0
1001takeWhile p t@(Text arr off len) = loop 0
1142 where loop !i | i >= len = t
1002 where loop !i | i >= len = t
1143 | p c = loop (i+d)
1003 | p c = loop (i+d)
1144− | otherwise = text arr off i
1004+ | otherwise = textP arr off i
1145 where Iter c d = iter t i
1005 where Iter c d = iter t i
1146{-# INLINE [1] takeWhile #-}
1006{-# INLINE [1] takeWhile #-}
@@ -1152,27 +1012,6 @@ takeWhile p t@(Text arr off len) = loop 0
1152 unstream (S.takeWhile p (stream t)) = takeWhile p t
1012 unstream (S.takeWhile p (stream t)) = takeWhile p t
1155−-- | /O(n)/ 'takeWhileEnd', applied to a predicate @p@ and a 'Text',
1156−-- returns the longest suffix (possibly empty) of elements that
1157−-- satisfy @p@. Subject to fusion.
1160−-- > takeWhileEnd (=='o') "foo" == "oo"
1161−takeWhileEnd :: (Char -> Bool) -> Text -> Text
1162−takeWhileEnd p t@(Text arr off len) = loop (len-1) len
1163− where loop !i !l | l <= 0 = t
1164− | p c = loop (i+d) (l+d)
1165− | otherwise = text arr (off+l) (len-l)
1166− where (c,d) = reverseIter t i
1167−{-# INLINE [1] takeWhileEnd #-}
1170−"TEXT takeWhileEnd -> fused" [~1] forall p t.
1171− takeWhileEnd p t = S.reverse (S.takeWhile p (S.reverseStream t))
1172−"TEXT takeWhileEnd -> unfused" [1] forall p t.
1173− S.reverse (S.takeWhile p (S.reverseStream t)) = takeWhileEnd p t
1176-- | /O(n)/ 'dropWhile' @p@ @t@ returns the suffix remaining after
1015-- | /O(n)/ 'dropWhile' @p@ @t@ returns the suffix remaining after
1177-- 'takeWhile' @p@ @t@. Subject to fusion.
1016-- 'takeWhile' @p@ @t@. Subject to fusion.
1178dropWhile :: (Char -> Bool) -> Text -> Text
1017dropWhile :: (Char -> Bool) -> Text -> Text
@@ -1191,9 +1030,8 @@ dropWhile p t@(Text arr off len) = loop 0 0
1193-- | /O(n)/ 'dropWhileEnd' @p@ @t@ returns the prefix remaining after
1032-- | /O(n)/ 'dropWhileEnd' @p@ @t@ returns the prefix remaining after
1194−-- dropping characters that satisfy the predicate @p@ from the end of
1033+-- dropping characters that fail the predicate @p@ from the end of
1195-- @t@. Subject to fusion.
1034-- @t@. Subject to fusion.
1197-- Examples:
1035-- Examples:
1199-- > dropWhileEnd (=='.') "foo..." == "foo"
1037-- > dropWhileEnd (=='.') "foo..." == "foo"
@@ -1213,7 +1051,7 @@ dropWhileEnd p t@(Text arr off len) = loop (len-1) len
1215-- | /O(n)/ 'dropAround' @p@ @t@ returns the substring remaining after
1053-- | /O(n)/ 'dropAround' @p@ @t@ returns the substring remaining after
1216−-- dropping characters that satisfy the predicate @p@ from both the
1054+-- dropping characters that fail the predicate @p@ from both the
1217-- beginning and end of @t@. Subject to fusion.
1055-- beginning and end of @t@. Subject to fusion.
1218dropAround :: (Char -> Bool) -> Text -> Text
1056dropAround :: (Char -> Bool) -> Text -> Text
1219dropAround p = dropWhile p . dropWhileEnd p
1057dropAround p = dropWhile p . dropWhileEnd p
@@ -1248,8 +1086,13 @@ splitAt :: Int -> Text -> (Text, Text)
1248splitAt n t@(Text arr off len)
1086splitAt n t@(Text arr off len)
1249 | n <= 0 = (empty, t)
1087 | n <= 0 = (empty, t)
1250 | n >= len = (t, empty)
1088 | n >= len = (t, empty)
1251− | otherwise = let k = iterN n t
1089+ | otherwise = (Text arr off k, Text arr (off+k) (len-k))
1252− in (text arr off k, text arr (off+k) (len-k))
1090+ where k = loop 0 0
1092+ | i >= len || cnt >= n = i
1093+ | otherwise = loop (i+d) (cnt+1)
1094+ where d = iter_ t i
1095+{-# INLINE splitAt #-}
1254-- | /O(n)/ 'span', applied to a predicate @p@ and text @t@, returns
1097-- | /O(n)/ 'span', applied to a predicate @p@ and text @t@, returns
1255-- a pair whose first element is the longest prefix (possibly empty)
1098-- a pair whose first element is the longest prefix (possibly empty)
@@ -1308,9 +1151,9 @@ tails t | null t = [empty]
1308-- copies to create substrings; they just construct new 'Text's that
1151-- copies to create substrings; they just construct new 'Text's that
1309-- are slices of the original.
1152-- are slices of the original.
1311−-- | /O(m+n)/ Break a 'Text' into pieces separated by the first 'Text'
1154+-- | /O(m+n)/ Break a 'Text' into pieces separated by the first
1312−-- argument (which cannot be empty), consuming the delimiter. An empty
1155+-- 'Text' argument, consuming the delimiter. An empty delimiter is
1313−-- delimiter is invalid, and will cause an error to be raised.
1156+-- invalid, and will cause an error to be raised.
1315-- Examples:
1158-- Examples:
@@ -1323,23 +1166,16 @@ tails t | null t = [empty]
1323-- > intercalate s . splitOn s == id
1166-- > intercalate s . splitOn s == id
1324-- > splitOn (singleton c) == split (==c)
1167-- > splitOn (singleton c) == split (==c)
1326−-- (Note: the string @s@ to split on above cannot be empty.)
1328-- In (unlikely) bad cases, this function's time complexity degrades
1169-- In (unlikely) bad cases, this function's time complexity degrades
1329-- towards /O(n*m)/.
1170-- towards /O(n*m)/.
1330−splitOn :: Text
1171+splitOn :: Text -> Text -> [Text]
1331− -- ^ String to split on. If this string is empty, an error
1336splitOn pat@(Text _ _ l) src@(Text arr off len)
1172splitOn pat@(Text _ _ l) src@(Text arr off len)
1337 | l <= 0 = emptyError "splitOn"
1173 | l <= 0 = emptyError "splitOn"
1338 | isSingleton pat = split (== unsafeHead pat) src
1174 | isSingleton pat = split (== unsafeHead pat) src
1339 | otherwise = go 0 (indices pat src)
1175 | otherwise = go 0 (indices pat src)
1341− go !s (x:xs) = text arr (s+off) (x-s) : go (x+l) xs
1177+ go !s (x:xs) = textP arr (s+off) (x-s) : go (x+l) xs
1342− go s _ = [text arr (s+off) (len-s)]
1178+ go s _ = [textP arr (s+off) (len-s)]
1343{-# INLINE [1] splitOn #-}
1179{-# INLINE [1] splitOn #-}
1345{-# RULES
1181{-# RULES
@@ -1431,7 +1267,7 @@ breakOn pat src@(Text arr off len)
1431 | null pat = emptyError "breakOn"
1267 | null pat = emptyError "breakOn"
1432 | otherwise = case indices pat src of
1268 | otherwise = case indices pat src of
1433 [] -> (src, empty)
1269 [] -> (src, empty)
1434− (x:_) -> (text arr off x, text arr (off+x) (len-x))
1270+ (x:_) -> (textP arr off x, textP arr (off+x) (len-x))
1435{-# INLINE breakOn #-}
1271{-# INLINE breakOn #-}
1437-- | /O(n+m)/ Similar to 'breakOn', but searches from the end of the
1273-- | /O(n+m)/ Similar to 'breakOn', but searches from the end of the
@@ -1473,7 +1309,7 @@ breakOnAll pat src@(Text arr off slen)
1473 | otherwise = L.map step (indices pat src)
1309 | otherwise = L.map step (indices pat src)
1475 step x = (chunk 0 x, chunk x (slen-x))
1311 step x = (chunk 0 x, chunk x (slen-x))
1476− chunk !n !l = text arr (n+off) l
1312+ chunk !n !l = textP arr (n+off) l
1477{-# INLINE breakOnAll #-}
1313{-# INLINE breakOnAll #-}
1479-------------------------------------------------------------------------------
1315-------------------------------------------------------------------------------
@@ -1540,7 +1376,7 @@ countChar c t = S.countChar c (stream t)
1540-- equivalent to a pair of 'unpack' operations.
1376-- equivalent to a pair of 'unpack' operations.
1541zip :: Text -> Text -> [(Char,Char)]
1377zip :: Text -> Text -> [(Char,Char)]
1542zip a b = S.unstreamList $ S.zipWith (,) (stream a) (stream b)
1378zip a b = S.unstreamList $ S.zipWith (,) (stream a) (stream b)
1543−{-# INLINE zip #-}
1379+{-# INLINE [0] zip #-}
1545-- | /O(n)/ 'zipWith' generalises 'zip' by zipping with the function
1381-- | /O(n)/ 'zipWith' generalises 'zip' by zipping with the function
1546-- given as the first argument, instead of a tupling function.
1382-- given as the first argument, instead of a tupling function.
@@ -1548,7 +1384,7 @@ zip a b = S.unstreamList $ S.zipWith (,) (stream a) (stream b)
1548zipWith :: (Char -> Char -> Char) -> Text -> Text -> Text
1384zipWith :: (Char -> Char -> Char) -> Text -> Text -> Text
1549zipWith f t1 t2 = unstream (S.zipWith g (stream t1) (stream t2))
1385zipWith f t1 t2 = unstream (S.zipWith g (stream t1) (stream t2))
1550 where g a b = safe (f a b)
1386 where g a b = safe (f a b)
1551−{-# INLINE zipWith #-}
1387+{-# INLINE [0] zipWith #-}
1553-- | /O(n)/ Breaks a 'Text' up into a list of words, delimited by 'Char's
1389-- | /O(n)/ Breaks a 'Text' up into a list of words, delimited by 'Char's
1554-- representing white space.
1390-- representing white space.
@@ -1673,7 +1509,7 @@ isInfixOf needle haystack
1673-- > fnordLength _ = -1
1509-- > fnordLength _ = -1
1674stripPrefix :: Text -> Text -> Maybe Text
1510stripPrefix :: Text -> Text -> Maybe Text
1675stripPrefix p@(Text _arr _off plen) t@(Text arr off len)
1511stripPrefix p@(Text _arr _off plen) t@(Text arr off len)
1676− | p `isPrefixOf` t = Just $! text arr (off+plen) (len-plen)
1512+ | p `isPrefixOf` t = Just $! textP arr (off+plen) (len-plen)
1677 | otherwise = Nothing
1513 | otherwise = Nothing
1679-- | /O(n)/ Find the longest non-empty common prefix of two strings
1515-- | /O(n)/ Find the longest non-empty common prefix of two strings
@@ -1693,8 +1529,8 @@ commonPrefixes t0@(Text arr0 off0 len0) t1@(Text arr1 off1 len1) = go 0 0
1694 go !i !j | i < len0 && j < len1 && a == b = go (i+d0) (j+d1)
1530 go !i !j | i < len0 && j < len1 && a == b = go (i+d0) (j+d1)
1695 | i > 0 = Just (Text arr0 off0 i,
1531 | i > 0 = Just (Text arr0 off0 i,
1696− text arr0 (off0+i) (len0-i),
1532+ textP arr0 (off0+i) (len0-i),
1697− text arr1 (off1+j) (len1-j))
1533+ textP arr1 (off1+j) (len1-j))
1698 | otherwise = Nothing
1534 | otherwise = Nothing
1699 where Iter a d0 = iter t0 i
1535 where Iter a d0 = iter t0 i
1700 Iter b d1 = iter t1 j
1536 Iter b d1 = iter t1 j
@@ -1719,7 +1555,7 @@ commonPrefixes t0@(Text arr0 off0 len0) t1@(Text arr1 off1 len1) = go 0 0
1719-- > quuxLength _ = -1
1555-- > quuxLength _ = -1
1720stripSuffix :: Text -> Text -> Maybe Text
1556stripSuffix :: Text -> Text -> Maybe Text
1721stripSuffix p@(Text _arr _off plen) t@(Text arr off len)
1557stripSuffix p@(Text _arr _off plen) t@(Text arr off len)
1722− | p `isSuffixOf` t = Just $! text arr off (len-plen)
1558+ | p `isSuffixOf` t = Just $! textP arr off (len-plen)
1723 | otherwise = Nothing
1559 | otherwise = Nothing
1725-- | Add a list of non-negative numbers. Errors out on overflow.
1561-- | Add a list of non-negative numbers. Errors out on overflow.
@@ -1748,7 +1584,6 @@ overflowError fun = P.error $ "Data.Text." ++ fun ++ ": size overflow"
1748copy :: Text -> Text
1584copy :: Text -> Text
1749copy (Text arr off len) = Text (A.run go) 0 len
1585copy (Text arr off len) = Text (A.run go) 0 len
1751− go :: ST s (A.MArray s)
1753 marr <- A.new len
1588 marr <- A.new len
1754 A.copyI marr 0 arr off len
1589 A.copyI marr 0 arr off len