41 lines
1.4 KiB
Haskell
41 lines
1.4 KiB
Haskell
module Parse.Parser (parseProgram) where
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import SourceSyntax.Module
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import Control.Applicative ((<$>), (<*>))
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import Control.Monad
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import Data.Char (isSymbol, isDigit)
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import Data.List (foldl',intercalate)
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import Text.Parsec hiding (newline,spaces)
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import qualified Text.PrettyPrint as P
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import Parse.Helpers
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import Parse.Binop (infixStmt, OpTable)
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import Parse.Expression
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import Parse.Type
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import Parse.Module
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import qualified Parse.Declaration as Decl
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freshDef = commitIf (freshLine >> (letter <|> char '_')) $ do
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freshLine
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Decl.declaration <?> "another datatype or variable definition"
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decls = do d <- Decl.declaration <?> "at least one datatype or variable definition"
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(d:) <$> many freshDef
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program = do
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optional freshLine
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(names,exports) <- option (["Main"],[]) (moduleDef `followedBy` freshLine)
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is <- (do try (lookAhead $ reserved "import")
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imports `followedBy` freshLine) <|> return []
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declarations <- decls
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optional freshLine ; optional spaces ; eof
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return $ Module names exports is declarations
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parseProgram :: String -> Either [P.Doc] (Module t v)
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parseProgram = setupParser program
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setupParser :: IParser a -> String -> Either [P.Doc] a
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setupParser p source =
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case iParse p "" source of
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Right result -> Right result
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Left err -> Left [ P.sep . map P.text . words $ "Parse error at " ++ show err ]
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