elm/compiler/Parse/Module.hs

59 lines
1.6 KiB
Haskell

module Parse.Module (moduleDef, getModuleName, imports) where
import Control.Applicative ((<$>), (<*>))
import Data.List (intercalate)
import Text.Parsec hiding (newline,spaces)
import Parse.Helpers
import SourceSyntax.Module (ImportMethod(..), Imports)
varList :: IParser [String]
varList = commaSep1 (var <|> parens symOp)
getModuleName :: String -> Maybe String
getModuleName source =
case iParse getModuleName source of
Right name -> Just name
Left _ -> Nothing
where
getModuleName = do
optional freshLine
(names, _) <- moduleDef
return (intercalate "." names)
moduleDef :: IParser ([String], [String])
moduleDef = do
try (reserved "module")
whitespace
names <- dotSep1 capVar <?> "name of module"
whitespace
exports <- option [] (parens varList)
whitespace <?> "reserved word 'where'"
reserved "where"
return (names, exports)
imports :: IParser Imports
imports = option [] ((:) <$> import' <*> many (try (freshLine >> import')))
import' :: IParser (String, ImportMethod)
import' =
do reserved "import"
whitespace
name <- intercalate "." <$> dotSep1 capVar
(,) name <$> option (As name) method
where
method :: IParser ImportMethod
method = try $ do whitespace
as' <|> importing'
as' :: IParser ImportMethod
as' = do
reserved "as"
whitespace
As <$> capVar <?> "alias for module"
importing' :: IParser ImportMethod
importing' =
parens (choice [ const (Hiding []) <$> string ".."
, Importing <$> varList
] <?> "listing of imported values (x,y,z)")