hxt-9.2.2: A collection of tools for processing XML with Haskell.

Portability | portable
Stability | experimental
Maintainer | Uwe Schmidt (uwe\@fh-wedel.de)
Safe Haskell | Safe-Infered

Control.Arrow.StateListArrow

Description

Implementation of list arrows with a state

Synopsis

- newtype SLA s a b = SLA {
  - runSLA :: s -> a -> (s, [b])
  }
- fromSLA :: ArrowList a => s -> SLA s b c -> a b c

# Documentation

newtype SLA s a b

list arrow combined with a state

Constructors

SLA |

Fields

runSLA :: s -> a -> (s, [b])

Instances

ArrowState s (SLA s) |
Arrow (SLA s) |
ArrowZero (SLA s) |
ArrowPlus (SLA s) |
ArrowChoice (SLA s) |
ArrowApply (SLA s) |
Category (SLA s) |
ArrowList (SLA s) |
ArrowWNF (SLA s) |
ArrowNF (SLA s) |
ArrowIf (SLA s) |
ArrowNavigatableTree (SLA s) |
ArrowTree (SLA s) |
ArrowDTD (SLA s) |
ArrowXml (SLA s) |

fromSLA :: ArrowList a => s -> SLA s b c -> a b c

conversion of state list arrows into arbitray other list arrows.

allows running a state list arrow within another arrow:

example:

     ... >>> fromSLA 0 (... setState ... getState ... ) >>> ...

runs a state arrow with initial state 0 (e..g. an Int) within another arrow sequence