Data.Text.Utf16.Rope

Documentation

data Rope

Rope of Text chunks with logarithmic concatenation. This rope offers an interface, based on UTF-16 code units. Use Data.Text.Rope, if you need code points, or Data.Text.Utf16.Rope.Mixed, if you need both interfaces.

Instances

Eq Rope

Defined in Data.Text.Utf16.Rope

Methods

(==) :: Rope -> Rope -> Bool

(/=) :: Rope -> Rope -> Bool

Ord Rope

Defined in Data.Text.Utf16.Rope

Methods

compare :: Rope -> Rope -> Ordering

(<) :: Rope -> Rope -> Bool

(<=) :: Rope -> Rope -> Bool

(>) :: Rope -> Rope -> Bool

(>=) :: Rope -> Rope -> Bool

max :: Rope -> Rope -> Rope

min :: Rope -> Rope -> Rope

Show Rope

Defined in Data.Text.Utf16.Rope

Methods

showsPrec :: Int -> Rope -> ShowS

show :: Rope -> String

showList :: [Rope] -> ShowS

IsString Rope

Defined in Data.Text.Utf16.Rope

Methods

fromString :: String -> Rope

Semigroup Rope

Defined in Data.Text.Utf16.Rope

Methods

(<>) :: Rope -> Rope -> Rope

sconcat :: NonEmpty Rope -> Rope

stimes :: Integral b => b -> Rope -> Rope

Monoid Rope

Defined in Data.Text.Utf16.Rope

Methods

mempty :: Rope

mappend :: Rope -> Rope -> Rope

mconcat :: [Rope] -> Rope

NFData Rope

Defined in Data.Text.Utf16.Rope

Methods

rnf :: Rope -> ()

fromText :: Text -> Rope

Create from Text, linear time.

fromTextLines :: TextLines -> Rope

Create from TextLines, linear time.

toText :: Rope -> Text

Glue chunks into Text, linear time.

toTextLines :: Rope -> TextLines

Glue chunks into TextLines, linear time.

null :: Rope -> Bool

Check whether a rope is empty, O(1).

Lines

lines :: Rope -> [Text]

Split into lines by \n, similar to Data.Text.lines. Each line is produced in O(1).

>>> :set -XOverloadedStrings
>>> lines ""
[]
>>> lines "foo"
["foo"]
>>> lines "foo\n"
["foo"]
>>> lines "foo\n\n"
["foo",""]
>>> lines "foo\nbar"
["foo","bar"]

lengthInLines :: Rope -> Word

Equivalent to length . lines, but in logarithmic time.

>>> :set -XOverloadedStrings
>>> lengthInLines ""
0
>>> lengthInLines "foo"
1
>>> lengthInLines "foo\n"
1
>>> lengthInLines "foo\n\n"
2
>>> lengthInLines "foo\nbar"
2

If you do not care about ignoring the last newline character, you can use posLine . lengthAsPosition instead, which works in O(1).

splitAtLine :: Word -> Rope -> (Rope, Rope)

Split at given line, logarithmic time.

>>> :set -XOverloadedStrings
>>> map (\l -> splitAtLine l "foo\nbar") [0..3]
[("","foo\nbar"),("foo\n","bar"),("foo\nbar",""),("foo\nbar","")]

UTF-16 code units

length :: Rope -> Word

Length in UTF-16 code units, O(1).

>>> :set -XOverloadedStrings
>>> length "fя𐀀"
4
>>> Data.Text.Rope.length "fя𐀀"
3

splitAt :: Word -> Rope -> Maybe (Rope, Rope)

Split at given UTF-16 code unit. If requested number of code units splits a code point in half, return Nothing. Takes linear time.

>>> :set -XOverloadedStrings
>>> map (\c -> splitAt c "fя𐀀") [0..4]
[Just ("","fя𐀀"),Just ("f","я𐀀"),Just ("fя","𐀀"),Nothing,Just ("fя𐀀","")]

data Position

Represent a position in a text.

Constructors

Position

Fields

• posLine :: !Word

  Line.

• posColumn :: !Word

  Column in UTF-16 code units.

Instances

Eq Position

Defined in Data.Text.Utf16.Lines

Methods

(==) :: Position -> Position -> Bool

(/=) :: Position -> Position -> Bool

Ord Position

Defined in Data.Text.Utf16.Lines

Methods

compare :: Position -> Position -> Ordering

(<) :: Position -> Position -> Bool

(<=) :: Position -> Position -> Bool

(>) :: Position -> Position -> Bool

(>=) :: Position -> Position -> Bool

max :: Position -> Position -> Position

min :: Position -> Position -> Position

Show Position

Defined in Data.Text.Utf16.Lines

Methods

showsPrec :: Int -> Position -> ShowS

show :: Position -> String

showList :: [Position] -> ShowS

Semigroup Position

Associativity does not hold when posLine overflows.

Defined in Data.Text.Utf16.Lines

Methods

(<>) :: Position -> Position -> Position

sconcat :: NonEmpty Position -> Position

stimes :: Integral b => b -> Position -> Position

Monoid Position

Defined in Data.Text.Utf16.Lines

Methods

mempty :: Position

mappend :: Position -> Position -> Position

mconcat :: [Position] -> Position

NFData Position

Defined in Data.Text.Utf16.Lines

Methods

rnf :: Position -> ()

lengthAsPosition :: Rope -> Position

Measure text length as an amount of lines and columns, O(1).

>>> :set -XOverloadedStrings
>>> lengthAsPosition "f𐀀"
Position {posLine = 0, posColumn = 3}
>>> lengthAsPosition "f\n𐀀"
Position {posLine = 1, posColumn = 2}
>>> lengthAsPosition "f\n𐀀\n"
Position {posLine = 2, posColumn = 0}

splitAtPosition :: Position -> Rope -> Maybe (Rope, Rope)

Combination of splitAtLine and subsequent splitAt. Time is linear in posColumn and logarithmic in posLine.

>>> :set -XOverloadedStrings
>>> splitAtPosition (Position 1 0) "f\n𐀀я"
Just ("f\n","𐀀я")
>>> splitAtPosition (Position 1 1) "f\n𐀀я"
Nothing
>>> splitAtPosition (Position 1 2) "f\n𐀀я"
Just ("f\n𐀀","я")
>>> splitAtPosition (Position 0 2) "f\n𐀀я"
Just ("f\n","𐀀я")
>>> splitAtPosition (Position 0 3) "f\n𐀀я"
Nothing
>>> splitAtPosition (Position 0 4) "f\n𐀀я"
Just ("f\n𐀀","я")