lens-4.11.1: Lenses, Folds and Traversals

Copyright(C) 2012-15 Edward Kmett
LicenseBSD-style (see the file LICENSE)
MaintainerEdward Kmett <ekmett@gmail.com>
Stabilityexperimental
Portabilitynon-portable
Safe HaskellNone
LanguageHaskell98

Data.Text.Lens

Description

 

Synopsis

Documentation

class IsText t where Source

Traversals for strict or lazy Text

Minimal complete definition

packed, builder

Methods

packed :: Iso' String t Source

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

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

builder :: Iso' t Builder Source

Convert between strict or lazy Text and a Builder.

fromText x ≡ x ^. builder

text :: IndexedTraversal' Int t Char Source

Traverse the individual characters in strict or lazy Text.

text = unpacked . traversed

Instances

unpacked :: IsText t => Iso' t String Source

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

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

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

unpacked ≡ from packed

_Text :: IsText t => Iso' t String Source

This is an alias for unpacked that makes it clearer how to use it with ('#').

_Text = from packed

>>> _Text # "hello" :: Strict.Text
"hello"