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|
----------------------------------------------------------------------
-- |
-- Module : IncrementalChart
-- Maintainer : PL
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/03/21 14:17:42 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.1 $
--
-- Implementation of /incremental/ deductive parsing,
-- i.e. parsing one word at the time.
-----------------------------------------------------------------------------
module GF.Parsing.IncrementalChart (-- * Type definitions
IncrementalChart,
-- * Functions
buildChart,
chartList
) where
import Array
import GF.Data.SortedList
import GF.Data.Assoc
buildChart :: (Ord item, Ord key) => (item -> key) ->
(Int -> item -> SList item) ->
(Int -> SList item) ->
(Int, Int) -> IncrementalChart item key
chartList :: (Ord item, Ord key) => (Int -> item -> edge) -> IncrementalChart item key -> [edge]
type IncrementalChart item key = Array Int (Assoc key (SList item))
----------
buildChart keyof rules axioms bounds = finalChartArray
where buildState k = limit (rules k) $ axioms k
finalChartList = map buildState [fst bounds .. snd bounds]
finalChartArray = listArray bounds $ map stateAssoc finalChartList
stateAssoc state = accumAssoc id [ (keyof item, item) | item <- state ]
chartList combine chart = [ combine k item |
(k, state) <- assocs chart,
item <- concatMap snd $ aAssocs state ]
|
