lens-4.15.4: Lenses, Folds and Traversals

Copyright(C) 2012-2016 Edward Kmett
LicenseBSD-style (see the file LICENSE)
MaintainerEdward Kmett <ekmett@gmail.com>
Stabilityexperimental
Portabilitynon-portable
Safe HaskellNone
LanguageHaskell98

Data.Text.Strict.Lens

Description

 

Synopsis

Documentation

packed :: Iso' String Text Source #

This isomorphism can be used to pack (or unpack) strict Text.

>>> "hello"^.packed -- :: Text
"hello"
pack x ≡ x ^. packed
unpack x ≡ x ^. from packed
packedfrom unpacked
packediso pack unpack

unpacked :: Iso' Text String Source #

This isomorphism can be used to unpack (or pack) lazy Text.

>>> "hello"^.unpacked -- :: String
"hello"

This Iso is provided for notational convenience rather than out of great need, since

unpackedfrom packed
pack x ≡ x ^. from unpacked
unpack x ≡ x ^. packed
unpackediso unpack pack

builder :: Iso' Text Builder Source #

Convert between strict Text and Builder .

fromText x ≡ x ^. builder
toStrict (toLazyText x) ≡ x ^. from builder

text :: IndexedTraversal' Int Text Char Source #

Traverse the individual characters in strict Text.

>>> anyOf text (=='o') "hello"
True

When the type is unambiguous, you can also use the more general each.

textunpacked . traversed
texteach

Note that when just using this as a Setter, setting map can be more efficient.

utf8 :: Prism' ByteString Text Source #

Encode/Decode a strict Text to/from strict ByteString, via UTF-8.

>>> utf8 # "☃"
"\226\152\131"

_Text :: Iso' Text String Source #

This is an alias for unpacked that makes it more obvious how to use it with #

> _Text # "hello" -- :: Text

"hello"

pattern Text :: String -> Text Source #