Data.Text.Strict.Lens

Documentation

packed :: Iso' String Text

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

>>> "hello"^.packed -- :: Text
"hello"

pack x ≡ x ^. packed
unpack x ≡ x ^. from packed
packed ≡ from unpacked
packed ≡ iso pack unpack

unpacked :: Iso' Text String

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

unpacked ≡ from packed

pack x ≡ x ^. from unpacked
unpack x ≡ x ^. packed
unpacked ≡ iso unpack pack

builder :: Iso' Text Builder

Convert between strict Text and Builder .

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

text :: IndexedTraversal' Int Text Char

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.

text ≡ unpacked . traversed
text ≡ each

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

utf8 :: Prism' ByteString Text

EncodeDecode a strict Text tofrom strict ByteString, via UTF-8.

>>> utf8 # "☃"
"\226\152\131"

_Text :: Iso' Text String

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

> _Text # "hello" -- :: Text

"hello"