mustache2hs 0.2 → 0.2.1

raw patch · 2 files changed

+87/−1 lines, 2 files

Files

• ParseRecords.hs +84/−0
• mustache2hs.cabal +3/−1

@@ -0,0 +1,84 @@+module ParseRecords (extractRecords, MuType(..), Records, Record, Field) where++import Data.List+import Data.Maybe+import Control.Arrow++import Language.Haskell.Parser+import Language.Haskell.Syntax++import Data.Text (Text)+import qualified Data.Text as T++type Records = [(String, Record)] -- Typename, data constructor+type Record = (String, [Field]) -- Data constructor name, fields+type Field = (Text, MuType)+data MuType = MuList String | MuLambda | MuVariable | MuBool | MuNum deriving (Show, Eq)++isDataDecl :: HsDecl -> Bool+isDataDecl (HsDataDecl {}) = True+isDataDecl _ = False++isTypeDecl :: HsDecl -> Bool+isTypeDecl (HsTypeDecl {}) = True+isTypeDecl _ = False++hsNameToString :: HsName -> String+hsNameToString (HsIdent s) = s+hsNameToString (HsSymbol s) = s++extractTypeFromBangType :: HsBangType -> HsType+extractTypeFromBangType (HsBangedTy t) = t+extractTypeFromBangType (HsUnBangedTy t) = t++hsTypeName' :: [(String, HsType)] -> HsType -> Maybe String+hsTypeName' types (HsTyCon (UnQual s)) | isJust $ lookup (hsNameToString s) types =+	hsTypeName' types =<< lookup (hsNameToString s) types+hsTypeName' _ (HsTyCon (UnQual s)) = Just $ hsNameToString s+hsTypeName' _ _ = Nothing++hsTypeName :: [(String, HsType)] -> HsType -> String+hsTypeName types t =+	fromMaybe (error $ "Trying to get type name for: " ++ show t)+		(hsTypeName' types t)++hsTypeToMuType :: [(String, HsType)] -> HsType -> MuType+hsTypeToMuType types (HsTyApp (HsTyCon (Special HsListCon)) t) = MuList (hsTypeName types t)+hsTypeToMuType _ (HsTyFun {}) = MuLambda+hsTypeToMuType types (HsTyCon (UnQual s)) | isJust $ lookup (hsNameToString s) types =+	hsTypeToMuType types $ fromJust $ lookup (hsNameToString s) types+hsTypeToMuType types t | hsTypeName' types t == Just "Bool" = MuBool+hsTypeToMuType types t | hsTypeName' types t `elem` map Just [+		"Int", "Int8", "Int16", "Int32", "Int64", "Integer", "Word", "Word8",+		"Word16", "Word32", "Word64", "Double", "Float", "Rational"+	] = MuNum+hsTypeToMuType _ _ = MuVariable++extractFromField :: [(String, HsType)] -> ([HsName], HsBangType) -> Field+extractFromField types (name, t) =+	(T.pack $ concatMap hsNameToString name, hsTypeToMuType types $ extractTypeFromBangType t)++extractFromRecordConstructor :: [(String, HsType)] -> HsConDecl -> Record+extractFromRecordConstructor types (HsRecDecl _ cname fields) =+	(hsNameToString cname, map (extractFromField types) fields)+extractFromRecordConstructor _ _ = error "Only single data-constructor records may be used as context"++extractFromDataDecl :: [(String, HsType)] -> HsDecl -> (String, Record)+extractFromDataDecl types (HsDataDecl _ _ typeName _ [constructor] _) =+	(hsNameToString typeName, extractFromRecordConstructor types constructor)+extractFromDataDecl _ (HsDataDecl _ _ typeName  _ _ _) =+	(hsNameToString typeName, error "Only single data-constructor records may be used as context")+extractFromDataDecl _ _ = error "Programmer error, only call extractFromDataDecl with DataDecl"++extractFromTypeDecl :: HsDecl -> (String, HsType)+extractFromTypeDecl (HsTypeDecl _ name _ t) = (hsNameToString name, t)+extractFromTypeDecl _ = error "Programmer error, only call extractFromTypeDecl with TypeDecl"++extractRecords :: String -> (String, Records, [(String, Maybe String)])+extractRecords moduleSrc =+	(mod, map (extractFromDataDecl types) datas, simpleTypes)+	where+	simpleTypes = map (second $ hsTypeName' types) types+	types = map extractFromTypeDecl typeDecls+	(typeDecls, datas) = partition (isTypeDecl) $ filter (\d -> isDataDecl d || isTypeDecl d) decls+	ParseOk (HsModule _ (Module mod) _ _ decls) = parseModule moduleSrc

@@ -1,5 +1,5 @@ name:            mustache2hs-version:         0.2+version:         0.2.1 cabal-version:   >= 1.8 license:         OtherLicense license-file:    COPYING@@ -35,6 +35,8 @@  executable mustache2hs         main-is: mustache2hs.hs++        other-modules: ParseRecords          build-depends:                 base == 4.*,