forked from GitHub/gf-core
130 lines
3.6 KiB
Haskell
130 lines
3.6 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Module : GFCCAPI
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-- Maintainer : Aarne Ranta
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date:
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-- > CVS $Author:
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-- > CVS $Revision:
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--
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-- Reduced Application Programmer's Interface to GF, meant for
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-- embedded GF systems. AR 19/9/2007
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-----------------------------------------------------------------------------
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module GF.GFCC.API where
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import GF.GFCC.Linearize
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import GF.GFCC.Generate
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import GF.GFCC.Macros
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import GF.GFCC.DataGFCC
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import GF.GFCC.AbsGFCC
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import GF.GFCC.ParGFCC
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import GF.GFCC.ErrM
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import GF.Parsing.FCFG
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import GF.Conversion.SimpleToFCFG (convertGrammar)
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--import GF.Data.Operations
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--import GF.Infra.UseIO
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import qualified Data.Map as Map
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import System.Random (newStdGen)
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import System.Directory (doesFileExist)
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-- This API is meant to be used when embedding GF grammars in Haskell
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-- programs. The embedded system is supposed to use the
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-- .gfcm grammar format, which is first produced by the gf program.
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---------------------------------------------------
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-- Interface
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---------------------------------------------------
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data MultiGrammar = MultiGrammar {gfcc :: GFCC, parsers :: [(Language,FCFPInfo)]}
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type Language = String
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type Category = String
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type Tree = Exp
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file2grammar :: FilePath -> IO MultiGrammar
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linearize :: MultiGrammar -> Language -> Tree -> String
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parse :: MultiGrammar -> Language -> Category -> String -> [Tree]
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linearizeAll :: MultiGrammar -> Tree -> [String]
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linearizeAllLang :: MultiGrammar -> Tree -> [(Language,String)]
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parseAll :: MultiGrammar -> Category -> String -> [[Tree]]
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parseAllLang :: MultiGrammar -> Category -> String -> [(Language,[Tree])]
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generateAll :: MultiGrammar -> Category -> [Tree]
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generateRandom :: MultiGrammar -> Category -> IO [Tree]
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readTree :: MultiGrammar -> String -> Tree
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showTree :: Tree -> String
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languages :: MultiGrammar -> [Language]
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categories :: MultiGrammar -> [Category]
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startCat :: MultiGrammar -> Category
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---------------------------------------------------
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-- Implementation
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---------------------------------------------------
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file2grammar f = do
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gfcc <- file2gfcc f
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let fcfgs = convertGrammar gfcc
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return (MultiGrammar gfcc [(lang, buildFCFPInfo fcfg) | (CId lang,fcfg) <- fcfgs])
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file2gfcc f =
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readFileIf f >>= err (error) (return . mkGFCC) . pGrammar . myLexer
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linearize mgr lang = GF.GFCC.Linearize.linearize (gfcc mgr) (CId lang)
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parse mgr lang cat s =
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case lookup lang (parsers mgr) of
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Nothing -> error "no parser"
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Just pinfo -> case parseFCF "bottomup" pinfo (CId cat) (words s) of
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Ok x -> x
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Bad s -> error s
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linearizeAll mgr = map snd . linearizeAllLang mgr
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linearizeAllLang mgr t =
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[(lang,linearThis mgr lang t) | lang <- languages mgr]
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parseAll mgr cat = map snd . parseAllLang mgr cat
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parseAllLang mgr cat s =
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[(lang,ts) | lang <- languages mgr, let ts = parse mgr lang cat s, not (null ts)]
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generateRandom mgr cat = do
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gen <- newStdGen
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return $ genRandom gen (gfcc mgr) (CId cat)
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generateAll mgr cat = generate (gfcc mgr) (CId cat)
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readTree _ = err (const exp0) id . (pExp . myLexer)
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showTree = prt
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languages mgr = [l | CId l <- cncnames (gfcc mgr)]
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categories mgr = [c | CId c <- Map.keys (cats (abstract (gfcc mgr)))]
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startCat mgr = "S" ----
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------------ for internal use only
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linearThis = GF.GFCC.API.linearize
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err f g ex = case ex of
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Ok x -> g x
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Bad s -> f s
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readFileIf f = do
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b <- doesFileExist f
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if b then readFile f
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else putStrLn ("file " ++ f ++ " not found") >> return ""
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