forked from GitHub/gf-core
127 lines
4.1 KiB
Haskell
127 lines
4.1 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Module : PrJSRGS_ABNF
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-- Maintainer : BB
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/11/01 20:09:04 $
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-- > CVS $Author: bringert $
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-- > CVS $Revision: 1.16 $
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--
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-- This module prints a CFG as a JSGF grammar.
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--
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-- FIXME: remove \/ warn \/ fail if there are int \/ string literal
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-- categories in the grammar
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--
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-- FIXME: convert to UTF-8
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-----------------------------------------------------------------------------
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module GF.Speech.SRGS_ABNF (srgsAbnfPrinter, srgsAbnfNonRecursivePrinter) where
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import GF.Data.Utilities
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import GF.Infra.Option
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import GF.Speech.CFG
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import GF.Speech.SISR as SISR
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import GF.Speech.SRG
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import GF.Speech.RegExp
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import PGF (PGF, CId)
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import Data.Char
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import Data.List
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import Data.Maybe
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import Text.PrettyPrint.HughesPJ
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import Debug.Trace
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width :: Int
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width = 75
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srgsAbnfPrinter :: Maybe SISRFormat
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-> PGF -> CId -> String
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srgsAbnfPrinter sisr pgf cnc = showDoc $ prABNF sisr $ makeSimpleSRG pgf cnc
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srgsAbnfNonRecursivePrinter :: PGF -> CId -> String
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srgsAbnfNonRecursivePrinter pgf cnc = showDoc $ prABNF Nothing $ makeNonRecursiveSRG pgf cnc
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showDoc = renderStyle (style { lineLength = width })
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prABNF :: Maybe SISRFormat -> SRG -> Doc
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prABNF sisr srg
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= header $++$ foldr ($++$) empty (map prRule (srgRules srg))
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where
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header = text "#ABNF 1.0 UTF-8;" $$
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meta "description" ("Speech recognition grammar for " ++ srgName srg) $$
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meta "generator" "Grammatical Framework" $$
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language $$ tagFormat $$ mainCat
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language = maybe empty (\l -> text "language" <+> text l <> char ';') (srgLanguage srg)
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tagFormat | isJust sisr = text "tag-format" <+> text "<semantics/1.0>" <> char ';'
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| otherwise = empty
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mainCat = text "root" <+> prCat (srgStartCat srg) <> char ';'
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prRule (SRGRule cat alts) = rule (isExternalCat srg cat) cat (map prAlt alts)
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prAlt (SRGAlt mp n rhs) = sep [initTag, p (prItem sisr n rhs), finalTag]
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where initTag = tag sisr (profileInitSISR n)
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finalTag = tag sisr (profileFinalSISR n)
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p = if isEmpty initTag && isEmpty finalTag then id else parens
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prCat :: Cat -> Doc
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prCat c = char '$' <> text c
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prItem :: Maybe SISRFormat -> CFTerm -> SRGItem -> Doc
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prItem sisr t = f 0
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where
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f _ (REUnion []) = text "$VOID"
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f p (REUnion xs)
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| not (null es) = brackets (f 0 (REUnion nes))
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| otherwise = (if p >= 1 then parens else id) (alts (map (f 1) xs))
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where (es,nes) = partition isEpsilon xs
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f _ (REConcat []) = text "$NULL"
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f p (REConcat xs) = (if p >= 3 then parens else id) (fsep (map (f 2) xs))
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f p (RERepeat x) = f 3 x <> text "<0->"
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f _ (RESymbol s) = prSymbol sisr t s
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prSymbol :: Maybe SISRFormat -> CFTerm -> SRGSymbol -> Doc
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prSymbol sisr cn (NonTerminal n@(c,_)) = prCat c <+> tag sisr (catSISR cn n)
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prSymbol _ cn (Terminal t)
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| all isPunct t = empty -- removes punctuation
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| otherwise = text t -- FIXME: quote if there is whitespace or odd chars
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tag :: Maybe SISRFormat -> (SISRFormat -> SISRTag) -> Doc
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tag Nothing _ = empty
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tag (Just fmt) t =
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case t fmt of
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[] -> empty
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-- grr, silly SRGS ABNF does not have an escaping mechanism
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ts | '{' `elem` x || '}' `elem` x -> text "{!{" <+> text x <+> text "}!}"
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| otherwise -> text "{" <+> text x <+> text "}"
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where x = prSISR ts
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isPunct :: Char -> Bool
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isPunct c = c `elem` "-_.;.,?!"
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comment :: String -> Doc
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comment s = text "//" <+> text s
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alts :: [Doc] -> Doc
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alts = fsep . prepunctuate (text "| ")
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rule :: Bool -> Cat -> [Doc] -> Doc
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rule pub c xs = p <+> prCat c <+> char '=' <+> nest 2 (alts xs) <+> char ';'
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where p = if pub then text "public" else empty
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meta :: String -> String -> Doc
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meta n v = text "meta" <+> text (show n) <+> text "is" <+> text (show v) <> char ';'
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-- Pretty-printing utilities
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emptyLine :: Doc
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emptyLine = text ""
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prepunctuate :: Doc -> [Doc] -> [Doc]
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prepunctuate _ [] = []
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prepunctuate p (x:xs) = x : map (p <>) xs
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($++$) :: Doc -> Doc -> Doc
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x $++$ y = x $$ emptyLine $$ y
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