git.iko.soy/elk
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elk/compiler/Compiler.hs
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1{-# LANGUAGE DeriveDataTypeable #-}
2module Main where
4import Control.Monad
5import qualified Data.Map as Map
6import qualified Data.List as List
7import qualified Data.Binary as Binary
8import Data.Version (showVersion)
9import System.Console.CmdArgs hiding (program)
10import System.Directory
11import System.Exit
12import System.FilePath
14import qualified Text.Blaze.Html.Renderer.Pretty as Pretty
15import qualified Text.Blaze.Html.Renderer.String as Normal
16import qualified Text.Jasmine as JS
17import qualified Data.ByteString.Lazy.Char8 as BS
19import qualified Metadata.Prelude as Prelude
20import SourceSyntax.Module
21import Initialize (buildFromSource, getSortedModuleNames, Interfaces)
22import Generate.JavaScript (jsModule)
23import Generate.Html (createHtml, JSStyle(..), JSSource(..))
24import Paths_Elm
26import SourceSyntax.PrettyPrint (pretty, variable)
27import Text.PrettyPrint as P
28import qualified Type.Type as Type
29import qualified Parse.Type as Parse
30import qualified Data.Traversable as Traverse
32data Flags =
33 Flags { make :: Bool
34 , files :: [FilePath]
35 , runtime :: Maybe FilePath
36 , only_js :: Bool
37 , print_types :: Bool
38 , print_program :: Bool
39 , scripts :: [FilePath]
40 , no_prelude :: Bool
41 , minify :: Bool
42 , output_directory :: FilePath
43 }
44 deriving (Data,Typeable,Show,Eq)
46flags = Flags
47 { make = False
48 &= help "automatically compile dependencies."
49 , files = def &= args &= typ "FILES"
50 , runtime = Nothing &= typFile
51 &= help "Specify a custom location for Elm's runtime system."
52 , only_js = False
53 &= help "Compile only to JavaScript."
54 , print_types = False
55 &= help "Print out infered types of top-level definitions."
56 , print_program = False
57 &= help "Print out an internal representation of a program."
58 , scripts = [] &= typFile
59 &= help "Load JavaScript files in generated HTML. Files will be included in the given order."
60 , no_prelude = False
61 &= help "Do not import Prelude by default, used only when compiling standard libraries."
62 , minify = False
63 &= help "Minify generated JavaScript and HTML"
64 , output_directory = "ElmFiles" &= typFile
65 &= help "Output files to directory specified. Defaults to ElmFiles/ directory."
66 } &= help "Compile Elm programs to HTML, CSS, and JavaScript."
67 &= summary ("The Elm Compiler " ++ showVersion version ++ ", (c) Evan Czaplicki")
69main :: IO ()
70main = compileArgs =<< cmdArgs flags
72compileArgs :: Flags -> IO ()
73compileArgs flags =
74 case files flags of
75 [] -> putStrLn "Usage: elm [OPTIONS] [FILES]\nFor more help: elm --help"
76 fs -> mapM_ (build flags) fs
79file :: Flags -> FilePath -> String -> FilePath
80file flags filePath ext = output_directory flags </> replaceExtension filePath ext
82elmo :: Flags -> FilePath -> FilePath
83elmo flags filePath = file flags filePath "elmo"
84elmi flags filePath = file flags filePath "elmi"
87buildFile :: Flags -> Int -> Int -> Interfaces -> FilePath -> IO ModuleInterface
88buildFile flags moduleNum numModules interfaces filePath =
89 do compiled <- alreadyCompiled
90 if not compiled then compile
91 else getInterface `fmap` Binary.decodeFile (elmi flags filePath)
92 where
93 getInterface :: (String, ModuleInterface) -> ModuleInterface
94 getInterface = snd
96 alreadyCompiled :: IO Bool
97 alreadyCompiled = do
98 existsi <- doesFileExist (elmi flags filePath)
99 existso <- doesFileExist (elmo flags filePath)
100 if not existsi || not existso
101 then return False
102 else do tsrc <- getModificationTime filePath
103 tint <- getModificationTime (elmo flags filePath)
104 return (tsrc < tint)
106 number :: String
107 number = "[" ++ show moduleNum ++ " of " ++ show numModules ++ "]"
109 name :: String
110 name = List.intercalate "." (splitDirectories (dropExtensions filePath))
112 compile :: IO ModuleInterface
113 compile = do
114 putStrLn (number ++ " Compiling " ++ name)
115 source <- readFile filePath
116 createDirectoryIfMissing True (output_directory flags)
117 metaModule <-
118 case buildFromSource interfaces source of
119 Left err -> mapM print err >> exitFailure
120 Right modul -> do
121 if print_program flags then print . pretty $ program modul else return ()
122 return modul
124 if print_types flags then printTypes metaModule else return ()
125 tipes <- toSrcTypes (types metaModule)
126 let interface = ModuleInterface {
127 iTypes = tipes,
128 iAdts = datatypes metaModule,
129 iAliases = aliases metaModule
130 }
131 createDirectoryIfMissing True . dropFileName $ elmi flags filePath
132 Binary.encodeFile (elmi flags filePath) (name,interface)
133 writeFile (elmo flags filePath) (jsModule metaModule)
134 return interface
136toSrcTypes tipes = Traverse.traverse convert tipes
137 where
138 convert t = fmap (Parse.readType . P.render) (Type.extraPretty t)
140printTypes metaModule = do
141 putStrLn ""
142 forM_ (Map.toList $ types metaModule) $ \(n,t) -> do
143 pt <- Type.extraPretty t
144 print $ variable n <+> P.text ":" <+> pt
145 putStrLn ""
147getRuntime :: Flags -> IO FilePath
148getRuntime flags =
149 case runtime flags of
150 Just fp -> return fp
151 Nothing -> getDataFileName "elm-runtime.js"
153build :: Flags -> FilePath -> IO ()
154build flags rootFile = do
155 let noPrelude = no_prelude flags
156 files <- if make flags then getSortedModuleNames noPrelude rootFile else return [rootFile]
157 let ifaces = if noPrelude then Map.empty else Prelude.interfaces
158 interfaces <- buildFiles flags (length files) ifaces files
159 js <- foldM appendToOutput "" files
160 case only_js flags of
161 True -> do
162 putStr "Generating JavaScript ... "
163 writeFile (file flags rootFile "js") (genJs js)
164 putStrLn "Done"
165 False -> do
166 putStr "Generating HTML ... "
167 runtime <- getRuntime flags
168 let html = genHtml $ createHtml runtime rootFile (sources js) ""
169 writeFile (file flags rootFile "html") html
170 putStrLn "Done"
172 where
173 appendToOutput :: String -> FilePath -> IO String
174 appendToOutput js filePath =
175 do src <- readFile (elmo flags filePath)
176 return (src ++ js)
178 genHtml = if minify flags then Normal.renderHtml else Pretty.renderHtml
179 genJs = if minify flags then BS.unpack . JS.minify . BS.pack else id
180 sources js = map Link (scripts flags) ++
181 [ Source (if minify flags then Minified else Readable) js ]
184buildFiles :: Flags -> Int -> Interfaces -> [FilePath] -> IO Interfaces
185buildFiles _ _ interfaces [] = return interfaces
186buildFiles flags numModules interfaces (filePath:rest) = do
187 interface <- buildFile flags (numModules - length rest) numModules interfaces filePath
188 let moduleName = List.intercalate "." (splitDirectories (dropExtensions filePath))
189 interfaces' = Map.insert moduleName interface interfaces
190 buildFiles flags numModules interfaces' rest