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51 lines
1.4 KiB
Haskell
51 lines
1.4 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Module : IncrementalChart
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-- Maintainer : PL
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/04/11 13:52:53 $
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-- > CVS $Author: peb $
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-- > CVS $Revision: 1.1 $
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--
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-- Implementation of /incremental/ deductive parsing,
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-- i.e. parsing one word at the time.
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-----------------------------------------------------------------------------
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module GF.OldParsing.IncrementalChart
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(-- * Type definitions
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IncrementalChart,
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-- * Functions
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buildChart,
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chartList
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) where
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import Array
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import GF.Data.SortedList
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import GF.Data.Assoc
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buildChart :: (Ord item, Ord key) => (item -> key) ->
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(Int -> item -> SList item) ->
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(Int -> SList item) ->
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(Int, Int) -> IncrementalChart item key
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chartList :: (Ord item, Ord key) => (Int -> item -> edge) -> IncrementalChart item key -> [edge]
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type IncrementalChart item key = Array Int (Assoc key (SList item))
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----------
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buildChart keyof rules axioms bounds = finalChartArray
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where buildState k = limit (rules k) $ axioms k
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finalChartList = map buildState [fst bounds .. snd bounds]
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finalChartArray = listArray bounds $ map stateAssoc finalChartList
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stateAssoc state = accumAssoc id [ (keyof item, item) | item <- state ]
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chartList combine chart = [ combine k item |
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(k, state) <- assocs chart,
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item <- concatMap snd $ aAssocs state ]
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