diff --git a/Data/ConfigManager.hs b/Data/ConfigManager.hs new file mode 100644 --- /dev/null +++ b/Data/ConfigManager.hs @@ -0,0 +1,90 @@ +-- | +-- Module: Data.ConfigManager +-- License: GPL-3 +-- Maintainer: Joris Guyonvarch +-- Stability: experimental +-- +-- A configuration management library. + +module Data.ConfigManager + ( + -- * Configuration file format + -- $format + + -- ** Binding a name to a value + -- $bindings + + -- ** Import other files + -- $import + + -- ** Comments + -- $comments + + -- * Configuration loading + readConfig + + -- * Lookup functions + , lookup + , lookupDefault + ) where + +import Prelude hiding (lookup) +import Text.Read (readMaybe) +import Control.Monad (join) + +import Data.Text (Text) +import qualified Data.Text as T +import qualified Data.HashMap.Strict as M + +import qualified Data.ConfigManager.Reader as R +import Data.ConfigManager.Types + +-- | Load a 'Config' from a given 'FilePath' + +readConfig :: FilePath -> IO (Either Text Config) +readConfig = R.readConfig Required + +-- | Lookup for the value associated to a name + +lookup :: Read a => Name -> Config -> Maybe a +lookup name config = join . fmap (readMaybe . T.unpack) $ M.lookup name (hashMap config) + +-- | Lookup for the value associated to a name and return the default value if +-- no binding exists with the given name + +lookupDefault :: Value -> Name -> Config -> Value +lookupDefault defaultValue name config = M.lookupDefault defaultValue name (hashMap config) + +-- $format +-- +-- A configuration file consists of a series of: +-- +-- * bindings, +-- * imports, +-- * and comments. + +-- $bindings +-- +-- A binding associates a name to a value: +-- +-- > number = 1 +-- > my-string = "Hello" +-- > a_double = 4.0 +-- > thatIsABoolean = True +-- > a_double = 5.0 +-- +-- If two or more bindings have the same name, only the last one is kept. + +-- $import +-- +-- An import is either required or optional: +-- +-- > import "database.conf" +-- > importMaybe "local.conf" + +-- $comments +-- +-- A comment begins with '#' and continues to the end of the line: +-- +-- > # Comment +-- > x = 8 # Another comment diff --git a/Data/ConfigManager/Parser.hs b/Data/ConfigManager/Parser.hs new file mode 100644 --- /dev/null +++ b/Data/ConfigManager/Parser.hs @@ -0,0 +1,73 @@ +{-# LANGUAGE OverloadedStrings #-} + +module Data.ConfigManager.Parser + ( parseConfig + ) where + +import Data.Text (Text) +import qualified Data.Text as T +import Data.Char (isSpace, isAlphaNum) + +import Text.ParserCombinators.Parsec + +import Data.ConfigManager.Types + +parseConfig :: Text -> Either Text [Expr] +parseConfig input = + case parse exprsParser "" (T.unpack (T.concat [input, "\n"])) of + Right exprs -> Right exprs + Left parserError -> Left . T.pack . show $ parserError + +exprsParser :: Parser [Expr] +exprsParser = skip *> many (exprParser <* restOfLine <* skip) <* eof + +exprParser :: Parser Expr +exprParser = + (try bindingParser) + <|> (try $ importParser "import" (Import Required)) + <|> (try $ importParser "importMaybe" (Import Optional)) + +bindingParser :: Parser Expr +bindingParser = do + name <- nameParser + _ <- spaces + _ <- char '=' + _ <- spaces + value <- valueParser + return $ Binding name value + +importParser :: String -> (FilePath -> Expr) -> Parser Expr +importParser name exprFromPath = do + _ <- string name + _ <- spaces + _ <- char '"' + path <- many (noneOf "\"") + _ <- char '"' + return $ exprFromPath path + +nameParser :: Parser Name +nameParser = do + first <- letter + rest <- many (satisfy (\c -> isAlphaNum c || c == '-' || c == '_')) + return . T.pack $ first : rest + +valueParser :: Parser Value +valueParser = T.strip . T.pack <$> many (noneOf "\n#") + +skip :: Parser () +skip = + (satisfy isSpace *> skip) + <|> (comment *> skip) + <|> (return ()) + +comment :: Parser () +comment = do + _ <- char '#' *> (many $ noneOf "\n") >> return () + return () + +restOfLine :: Parser () +restOfLine = do + _ <- many (char ' ') + _ <- optional comment + _ <- newline + return () diff --git a/Data/ConfigManager/Reader.hs b/Data/ConfigManager/Reader.hs new file mode 100644 --- /dev/null +++ b/Data/ConfigManager/Reader.hs @@ -0,0 +1,52 @@ +{-# LANGUAGE OverloadedStrings #-} +{-# LANGUAGE ScopedTypeVariables #-} + +module Data.ConfigManager.Reader + ( readConfig + ) where + +import Control.Monad (foldM) +import Control.Exception (catch, IOException) + +import System.FilePath.Posix (dropFileName, ()) + +import qualified Data.HashMap.Strict as M +import Data.Text (Text) +import qualified Data.Text.IO as T +import qualified Data.Text as T + +import Data.ConfigManager.Parser (parseConfig) +import Data.ConfigManager.Types + +readConfig :: Requirement -> FilePath -> IO (Either Text Config) +readConfig requirement path = + catch + (T.readFile path >>= readConfigText (dropFileName path)) + (\(_ :: IOException) -> return $ + case requirement of + Required -> Left . T.concat $ ["File ", T.pack path, " not found."] + Optional -> Right . Config . M.fromList $ [] + ) + +readConfigText :: FilePath -> Text -> IO (Either Text Config) +readConfigText fileDir input = + case parseConfig input of + Left errorMessage -> + return . Left $ errorMessage + Right exprs -> + foldM (go fileDir) (Right . Config . M.fromList $ []) exprs + +go :: FilePath -> Either Text Config -> Expr -> IO (Either Text Config) +go _ errorMessage@(Left _) _ = return errorMessage +go fileDir (Right config) expr = + case expr of + Binding name value -> + return . Right . Config $ M.insert name value (hashMap config) + Import requirement path -> do + eitherConfig <- readConfig requirement (fileDir path) + case eitherConfig of + Left errorMessage -> + return . Left $ errorMessage + Right importedConfig -> + let unionConfig = (hashMap importedConfig) `M.union` (hashMap config) + in return . Right . Config $ unionConfig diff --git a/Data/ConfigManager/Types.hs b/Data/ConfigManager/Types.hs new file mode 100644 --- /dev/null +++ b/Data/ConfigManager/Types.hs @@ -0,0 +1,17 @@ +-- | +-- Module: Data.ConfigManager.Config +-- License: GPL-3 +-- Maintainer: Joris Guyonvarch +-- Stability: experimental +-- +-- Configuration management types. + +module Data.ConfigManager.Types + ( Config(..) + , Expr(..) + , Name + , Value + , Requirement(..) + ) where + +import Data.ConfigManager.Types.Internal diff --git a/Data/ConfigManager/Types/Internal.hs b/Data/ConfigManager/Types/Internal.hs new file mode 100644 --- /dev/null +++ b/Data/ConfigManager/Types/Internal.hs @@ -0,0 +1,39 @@ +module Data.ConfigManager.Types.Internal + ( Config(..) + , Expr(..) + , Name + , Value + , Requirement(..) + ) where + +import Data.Text (Text) + +import Data.HashMap.Strict + +-- | Configuration data. + +data Config = Config + { hashMap :: HashMap Name Value + } deriving (Eq, Read, Show) + +-- | An expression is either a binding or an import. + +data Expr = + Binding Name Value + | Import Requirement FilePath + deriving (Eq, Read, Show) + +-- | A name is a text. + +type Name = Text + +-- | A value is a text. + +type Value = Text + +-- | A requirement is either required or optional. + +data Requirement = + Required + | Optional + deriving (Eq, Read, Show) diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/config-manager.cabal b/config-manager.cabal new file mode 100644 --- /dev/null +++ b/config-manager.cabal @@ -0,0 +1,56 @@ +name: config-manager +version: 0.0.0.1 +synopsis: Configuration management +description: + A configuration management library which supports: + . + * name-value bindings, + . + * required or optional imports, + . + * and comments. +homepage: https://gitlab.com/guyonvarch/config-manager +bug-reports: https://gitlab.com/guyonvarch/config-manager/issues +license: GPL-3 +license-file: LICENSE +author: Joris Guyonvarch +maintainer: joris@guyonvarch.me +category: Configuration, Data +build-type: Simple +cabal-version: >=1.10 + +data-files: tests/resources/*.conf + +library + exposed-modules: Data.ConfigManager, + Data.ConfigManager.Types + other-modules: Data.ConfigManager.Reader + Data.ConfigManager.Parser + Data.ConfigManager.Types.Internal + ghc-options: -Wall + build-depends: base < 5, + text, + unordered-containers, + parsec, + filepath + default-language: Haskell2010 + +source-repository head + type: git + location: https://gitlab.com/guyonvarch/config-manager + +Test-Suite test-config-manager + type: exitcode-stdio-1.0 + hs-source-dirs: tests + main-is: Test.hs + ghc-options: -Wall + build-depends: base, + text, + config-manager, + HUnit, + test-framework, + test-framework-hunit, + temporary, + directory, + unordered-containers + default-language: Haskell2010 diff --git a/tests/Test.hs b/tests/Test.hs new file mode 100644 --- /dev/null +++ b/tests/Test.hs @@ -0,0 +1,126 @@ +{-# LANGUAGE OverloadedStrings #-} + +module Main + ( main + ) where + +import Prelude hiding (lookup) + +import qualified Data.HashMap.Strict as M +import Data.Maybe (fromJust) + +import Test.Framework +import Test.Framework.Providers.HUnit +import Test.HUnit hiding (Test) + +import Data.ConfigManager +import Data.ConfigManager.Types (Config(..)) +import qualified Data.Text as T + +import Helper (forceGetConfig, getConfig, eitherToMaybe) + +main :: IO () +main = defaultMain tests + +tests :: [Test] +tests = + [ testCase "binding" bindingAssertion + , testCase "name" nameAssertion + , testCase "value" valueAssertion + , testCase "skip" skipAssertion + , testCase "import" importAssertion + ] + +bindingAssertion :: Assertion +bindingAssertion = do + empty <- forceGetConfig "" + assertEqual "empty" (M.fromList []) (hashMap empty) + + oneBinding <- forceGetConfig "x = \"foo\"" + assertEqual "one binding present" (Just "foo") (lookup "x" oneBinding :: Maybe String) + assertEqual "one binding missing" Nothing (lookup "y" oneBinding :: Maybe String) + assertEqual "one binding count" 1 (M.size . hashMap $ oneBinding) + + multipleBindings <- forceGetConfig $ T.unlines + [ "x = \"foo\"" + , "y = \"bar\"" + , "z = \"baz\"" + ] + assertEqual "multiple bindings count" 3 (M.size . hashMap $ multipleBindings) + assertEqual "multiple bindings last" (Just "baz") (lookup "z" multipleBindings :: Maybe String) + + overlappingBindings <- forceGetConfig $ T.unlines + [ "x = \"foo\"" + , "y = \"bar\"" + , "x = \"baz\"" + ] + assertEqual "overlapping bindings count" 2 (M.size . hashMap $ overlappingBindings) + assertEqual "overlapping bindings redefinition" (Just "baz") (lookup "x" overlappingBindings :: Maybe String) + +nameAssertion :: Assertion +nameAssertion = do + validNames <- forceGetConfig $ T.unlines + [ "validIdent = \"foo\" " + , "valid_ident = \"foo\"" + , "valid-ident = \"foo\"" + ] + assertEqual "validIdent" (Just "foo") (lookup "validIdent" validNames :: Maybe String) + assertEqual "valid_ident" (Just "foo") (lookup "valid_ident" validNames :: Maybe String) + assertEqual "valid-ident" (Just "foo") (lookup "valid-ident" validNames :: Maybe String) + + invalid1 <- getConfig "-invalid_ident = \"foo\"" + assertEqual "-invalid" Nothing invalid1 + + invalid2 <- getConfig "_invalid = \"foo\"" + assertEqual "_invalid" Nothing invalid2 + +valueAssertion :: Assertion +valueAssertion = do + config <- forceGetConfig $ T.unlines + [ "a = \"lorem ipsum sir dolor emet\"" + , "b = 4 " + , "c = 5.0 " + , "d = True " + ] + assertEqual "string" (Just "lorem ipsum sir dolor emet") (lookup "a" config :: Maybe String) + assertEqual "integer" (Just 4) (lookup "b" config :: Maybe Int) + assertEqual "double 1" (Just 4.0) (lookup "b" config :: Maybe Double) + assertEqual "double 2" (Just 5.0) (lookup "c" config :: Maybe Double) + assertEqual "integer fail" Nothing (lookup "c" config :: Maybe Int) + assertEqual "boolean" (Just True) (lookup "d" config :: Maybe Bool) + return () + +skipAssertion :: Assertion +skipAssertion = do + config <- forceGetConfig $ T.unlines + [ " " + , " # Comment " + , " x = \"foo\" " + , " " + , " #### " + , " " + , " y = \"bar\" # Other comment" + , " " + ] + assertEqual "bindings count" 2 (M.size . hashMap $ config) + assertEqual "bindings x" (Just "foo") (lookup "x" config :: Maybe String) + assertEqual "bindings y" (Just "bar") (lookup "y" config :: Maybe String) + +importAssertion :: Assertion +importAssertion = do + config <- fromJust . eitherToMaybe <$> readConfig "tests/resources/a.conf" + assertEqual "a" (Just "foo") (lookup "a" config :: Maybe String) + assertEqual "b" (Just 15) (lookup "b" config :: Maybe Int) + assertEqual "c" (Just "re baz") (lookup "c" config :: Maybe String) + assertEqual "d" (Just "zap") (lookup "d" config :: Maybe String) + assertEqual "e" (Just "re nam") (lookup "e" config :: Maybe String) + assertEqual "f" (Just 8.5) (lookup "f" config :: Maybe Double) + + missingConfig <- getConfig "import \"required.conf\"" + assertEqual "missing config" Nothing missingConfig + + missingOptionalConfig <- forceGetConfig $ T.unlines + [ "importMaybe \"required.conf\"" + , "x = 4" + ] + assertEqual "missing optional config" (Just 4) (lookup "x" missingOptionalConfig :: Maybe Int) diff --git a/tests/resources/a.conf b/tests/resources/a.conf new file mode 100644 --- /dev/null +++ b/tests/resources/a.conf @@ -0,0 +1,7 @@ +a = "foo" +b = "bar" +c = "baz" + +import "b.conf" + +e = "re nam" diff --git a/tests/resources/b.conf b/tests/resources/b.conf new file mode 100644 --- /dev/null +++ b/tests/resources/b.conf @@ -0,0 +1,6 @@ +import "c.conf" + +b = 15 +c = "re baz" +d = "zap" +e = "nam" diff --git a/tests/resources/c.conf b/tests/resources/c.conf new file mode 100644 --- /dev/null +++ b/tests/resources/c.conf @@ -0,0 +1,2 @@ +f = 8.5 +b = False