mirror of
https://github.com/GrammaticalFramework/gf-core.git
synced 2026-04-18 01:09:32 -06:00
87 lines
3.0 KiB
Haskell
87 lines
3.0 KiB
Haskell
----------------------------------------------------------------------
|
|
-- |
|
|
-- Module : GeneralChart
|
|
-- Maintainer : Peter Ljunglöf
|
|
-- Stability : (stable)
|
|
-- Portability : (portable)
|
|
--
|
|
-- > CVS $Date: 2005/03/21 22:31:48 $
|
|
-- > CVS $Author: peb $
|
|
-- > CVS $Revision: 1.2 $
|
|
--
|
|
-- Simple implementation of deductive chart parsing
|
|
-----------------------------------------------------------------------------
|
|
|
|
|
|
module GF.Parsing.GeneralChart
|
|
(-- * Type definition
|
|
Chart,
|
|
-- * Main functions
|
|
chartLookup,
|
|
buildChart,
|
|
-- * Probably not needed
|
|
emptyChart,
|
|
chartMember,
|
|
chartInsert,
|
|
chartList,
|
|
addToChart
|
|
) where
|
|
|
|
-- import Trace
|
|
|
|
import GF.Data.RedBlackSet
|
|
|
|
-- main functions
|
|
|
|
chartLookup :: (Ord item, Ord key) => Chart item key -> key -> [item]
|
|
buildChart :: (Ord item, Ord key) => (item -> key) ->
|
|
[Chart item key -> item -> [item]] -> [item] -> [item]
|
|
|
|
buildChart keyof rules axioms = chartList (addItems axioms emptyChart)
|
|
where addItems [] = id
|
|
addItems (item:items) = addItems items . addItem item
|
|
|
|
-- addItem item | trace ("+ "++show item++"\n") False = undefined
|
|
addItem item = addToChart item (keyof item)
|
|
(\chart -> foldr (consequence item) chart rules)
|
|
|
|
consequence item rule chart = addItems (rule chart item) chart
|
|
|
|
-- probably not needed
|
|
|
|
emptyChart :: (Ord item, Ord key) => Chart item key
|
|
chartMember :: (Ord item, Ord key) => Chart item key -> item -> key -> Bool
|
|
chartInsert :: (Ord item, Ord key) => Chart item key -> item -> key -> Maybe (Chart item key)
|
|
chartList :: (Ord item, Ord key) => Chart item key -> [item]
|
|
addToChart :: (Ord item, Ord key) => item -> key -> (Chart item key -> Chart item key) -> Chart item key -> Chart item key
|
|
|
|
addToChart item key after chart = maybe chart after (chartInsert chart item key)
|
|
|
|
|
|
--------------------------------------------------------------------------------
|
|
-- key charts as red/black trees
|
|
|
|
newtype Chart item key = KC (RedBlackMap key item)
|
|
deriving Show
|
|
|
|
emptyChart = KC rbmEmpty
|
|
chartMember (KC tree) item key = rbmElem key item tree
|
|
chartInsert (KC tree) item key = fmap KC (rbmInsert key item tree)
|
|
chartLookup (KC tree) key = rbmLookup key tree
|
|
chartList (KC tree) = concatMap snd (rbmList tree)
|
|
--------------------------------------------------------------------------------}
|
|
|
|
|
|
{--------------------------------------------------------------------------------
|
|
-- key charts as unsorted association lists -- OBSOLETE!
|
|
|
|
newtype Chart item key = SC [(key, item)]
|
|
|
|
emptyChart = SC []
|
|
chartMember (SC chart) item key = (key,item) `elem` chart
|
|
chartInsert (SC chart) item key = if (key,item) `elem` chart then Nothing else Just (SC ((key,item):chart))
|
|
chartLookup (SC chart) key = [ item | (key',item) <- chart, key == key' ]
|
|
chartList (SC chart) = map snd chart
|
|
--------------------------------------------------------------------------------}
|
|
|