Copyright	(C) 2011-2019 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	experimental
Portability	non-portable
Safe Haskell	Safe-Inferred
Language	Haskell2010

Text.Trifecta.Rope

Description

A rope is a data strucure to efficiently store and manipulate long strings. Wikipedia provides a nice overview: https://en.wikipedia.org/wiki/Rope_(data_structure)

Synopsis

data Rope = Rope !Delta !(FingerTree Delta Strand)
rope :: FingerTree Delta Strand -> Rope
ropeBS :: ByteString -> Rope
data Strand
- = Strand !ByteString !Delta
- | Skipping !Delta
strand :: ByteString -> Strand
strands :: Rope -> FingerTree Delta Strand
grabRest :: Delta -> Rope -> r -> (Delta -> ByteString -> r) -> r
grabLine :: Delta -> Rope -> r -> (Delta -> ByteString -> r) -> r

Documentation

data Rope Source #

Constructors

Rope !Delta !(FingerTree Delta Strand)

Instances

Instances details

Show Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods showsPrec :: Int -> Rope -> ShowS # show :: Rope -> String # showList :: [Rope] -> ShowS #
Semigroup Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods (<>) :: Rope -> Rope -> Rope # sconcat :: NonEmpty Rope -> Rope # stimes :: Integral b => b -> Rope -> Rope #
Monoid Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods mempty :: Rope # mappend :: Rope -> Rope -> Rope # mconcat :: [Rope] -> Rope #
HasDelta Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods delta :: Rope -> Delta Source #
HasBytes Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods bytes :: Rope -> Int64 Source #
Measured Delta Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods measure :: Rope -> Delta #
Reducer ByteString Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods unit :: ByteString -> Rope # snoc :: Rope -> ByteString -> Rope # cons :: ByteString -> Rope -> Rope #
Reducer Rope Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods unit :: Rope -> Rope # snoc :: Rope -> Rope -> Rope # cons :: Rope -> Rope -> Rope #
Reducer Strand Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods unit :: Strand -> Rope # snoc :: Rope -> Strand -> Rope # cons :: Strand -> Rope -> Rope #
Reducer [Char] Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods unit :: [Char] -> Rope # snoc :: Rope -> [Char] -> Rope # cons :: [Char] -> Rope -> Rope #

rope :: FingerTree Delta Strand -> Rope Source #

ropeBS :: ByteString -> Rope Source #

Construct a Rope out of a single ByteString strand.

data Strand Source #

Constructors

Strand !ByteString !Delta	Data of a certain length
Skipping !Delta	Absence of data of a certain length

Instances

Instances details

Data Strand Source #
Instance details Defined in Text.Trifecta.Rope Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Strand -> c Strand # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Strand # toConstr :: Strand -> Constr # dataTypeOf :: Strand -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Strand) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Strand) # gmapT :: (forall b. Data b => b -> b) -> Strand -> Strand # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Strand -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Strand -> r # gmapQ :: (forall d. Data d => d -> u) -> Strand -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Strand -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Strand -> m Strand # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Strand -> m Strand # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Strand -> m Strand #
Show Strand Source #
Instance details Defined in Text.Trifecta.Rope Methods showsPrec :: Int -> Strand -> ShowS # show :: Strand -> String # showList :: [Strand] -> ShowS #
Generic Strand Source #
Instance details Defined in Text.Trifecta.Rope Associated Types type Rep Strand :: Type -> Type # Methods from :: Strand -> Rep Strand x # to :: Rep Strand x -> Strand #
Hashable Strand Source #
Instance details Defined in Text.Trifecta.Rope Methods hashWithSalt :: Int -> Strand -> Int # hash :: Strand -> Int #
HasDelta Strand Source #
Instance details Defined in Text.Trifecta.Rope Methods delta :: Strand -> Delta Source #
HasBytes Strand Source #
Instance details Defined in Text.Trifecta.Rope Methods bytes :: Strand -> Int64 Source #
Measured Delta Strand Source #
Instance details Defined in Text.Trifecta.Rope Methods measure :: Strand -> Delta #
Reducer Strand Rope Source #
Instance details Defined in Text.Trifecta.Rope Methods unit :: Strand -> Rope # snoc :: Rope -> Strand -> Rope # cons :: Strand -> Rope -> Rope #
type Rep Strand Source #
Instance details Defined in Text.Trifecta.Rope type Rep Strand = D1 ('MetaData "Strand" "Text.Trifecta.Rope" "trifecta-2.1.1-EsXX7x7qONe82YctHMafhF" 'False) (C1 ('MetaCons "Strand" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'SourceUnpack 'SourceStrict 'DecidedStrict) (Rec0 ByteString) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Delta)) :+: C1 ('MetaCons "Skipping" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Delta)))

strand :: ByteString -> Strand Source #

Construct a single Strand out of a ByteString.

strands :: Rope -> FingerTree Delta Strand Source #

grabRest Source #

Arguments

:: Delta	Initial offset
-> Rope	Input
-> r	Default value if there is no input left
-> (Delta -> ByteString -> r)	If there is some input left, create an `r` out of the data from the initial offset until the end
-> r

Grab the entire rest of the input Rope, starting at an initial offset, or return a default if we’re already at or beyond the end. Also see grabLine.

Extract a suffix of a certain length from the input:

>>> grabRest (delta ("Hello " :: ByteString)) (ropeBS "Hello World\nLorem") Nothing (\x y -> Just (x, Lazy.toString y))
Just (Columns 6 6,"World\nLorem")

Same deal, but over multiple strands:

>>> grabRest (delta ("Hel" :: ByteString)) (ropeBS "Hello" <> ropeBS "World") Nothing (\x y -> Just (x, Lazy.toString y))
Just (Columns 3 3,"loWorld")

When the offset is too long, fall back to a default:

>>> grabRest (delta ("OffetTooLong" :: ByteString)) (ropeBS "Hello") Nothing (\x y -> Just (x, Lazy.toString y))
Nothing

grabLine Source #

Arguments

:: Delta	Initial offset
-> Rope	Input
-> r	Default value if there is no input left
-> (Delta -> ByteString -> r)	If there is some input left, create an `r` out of the data from the initial offset until the end of the line
-> r

Grab the rest of the line at a certain offset in the input Rope, or return a default if there is no newline left in the input. Also see grabRest.

>>> grabLine (delta ("Hello " :: ByteString)) (ropeBS "Hello" <> ropeBS " World\nLorem") Nothing (\x y -> Just (x, Strict.toString y))
Just (Columns 6 6,"World\n")