{-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE MultiParamTypeClasses #-} {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE RecordWildCards #-} {-# LANGUAGE TypeSynonymInstances #-} {-# LANGUAGE ViewPatterns #-} -- | Main library entry point. module Fay (module Fay.Types ,compileFile ,compileFileWithState ,compileFromTo ,compileFromToAndGenerateHtml ,toJsName ,showCompileError ,getRuntime) where import Fay.Compiler import Fay.Compiler.Misc (printSrcLoc) import Fay.Compiler.Packages import Fay.Types import Control.Applicative import Control.Monad import Data.List import Language.Haskell.Exts (prettyPrint) import Language.Haskell.Exts.Syntax import Paths_fay import System.FilePath -- | Compile the given file and write the output to the given path, or -- if nothing given, stdout. compileFromTo :: CompileConfig -> FilePath -> Maybe FilePath -> IO () compileFromTo config filein fileout = do result <- maybe (compileFile config filein) (compileFromToAndGenerateHtml config filein) fileout case result of Right out -> maybe (putStrLn out) (`writeFile` out) fileout Left err -> error $ showCompileError err -- | Compile the given file and write to the output, also generate any HTML. compileFromToAndGenerateHtml :: CompileConfig -> FilePath -> FilePath -> IO (Either CompileError String) compileFromToAndGenerateHtml config filein fileout = do result <- compileFile config { configFilePath = Just filein } filein case result of Right out -> do when (configHtmlWrapper config) $ writeFile (replaceExtension fileout "html") $ unlines [ "" , "" , " " ," " , unlines . map ((" "++) . makeScriptTagSrc) $ configHtmlJSLibs config , " " ++ makeScriptTagSrc relativeJsPath , " " , " " , " " , " " , ""] return (Right out) where relativeJsPath = makeRelative (dropFileName fileout) fileout makeScriptTagSrc :: FilePath -> String makeScriptTagSrc s = "" Left err -> return (Left err) -- | Compile the given file. compileFile :: CompileConfig -> FilePath -> IO (Either CompileError String) compileFile config filein = either Left (Right . fst) <$> compileFileWithState config filein -- | Compile a file returning the state. compileFileWithState :: CompileConfig -> FilePath -> IO (Either CompileError (String,CompileState)) compileFileWithState config filein = do runtime <- getRuntime hscode <- readFile filein raw <- readFile runtime config' <- resolvePackages config compileToModule filein config' raw (compileToplevelModule filein) hscode -- | Compile the given module to a runnable module. compileToModule :: (Show from,Show to,CompilesTo from to) => FilePath -> CompileConfig -> String -> (from -> Compile to) -> String -> IO (Either CompileError (String,CompileState)) compileToModule filepath config raw with hscode = do result <- compileViaStr filepath config with hscode return $ case result of Left err -> Left err Right (PrintState{..},state,_) -> Right ( generateWrapped (concat $ reverse psOutput) (stateModuleName state) , state ) where generateWrapped jscode (ModuleName modulename) = unlines $ filter (not . null) [if configExportRuntime config then raw else "" ,jscode ,if not (configLibrary config) then unlines [";" ,"Fay$$_(" ++ modulename ++ ".main);" ] else "" ] -- | Convert a Haskell filename to a JS filename. toJsName :: String -> String toJsName x = case reverse x of ('s':'h':'.': (reverse -> file)) -> file ++ ".js" _ -> x -- | Print a compile error for human consumption. showCompileError :: CompileError -> String showCompileError e = case e of ParseError pos err -> err ++ " at line: " ++ show (srcLine pos) ++ " column: " ++ show (srcColumn pos) UnsupportedDeclaration d -> "unsupported declaration: " ++ prettyPrint d UnsupportedExportSpec es -> "unsupported export specification: " ++ prettyPrint es UnsupportedExpression expr -> "unsupported expression syntax: " ++ prettyPrint expr UnsupportedFieldPattern p -> "unsupported field pattern: " ++ prettyPrint p UnsupportedImport i -> "unsupported import syntax, we're too lazy: " ++ prettyPrint i UnsupportedLet -> "let not supported here" UnsupportedLetBinding d -> "unsupported let binding: " ++ prettyPrint d UnsupportedLiteral lit -> "unsupported literal syntax: " ++ prettyPrint lit UnsupportedModuleSyntax m -> "unsupported module syntax" ++ prettyPrint m UnsupportedPattern pat -> "unsupported pattern syntax: " ++ prettyPrint pat UnsupportedQualStmt stmt -> "unsupported list qualifier: " ++ prettyPrint stmt UnsupportedRecursiveDo -> "recursive `do' isn't supported" UnsupportedRhs rhs -> "unsupported right-hand side syntax: " ++ prettyPrint rhs UnsupportedWhereInAlt alt -> "`where' not supported here: " ++ prettyPrint alt UnsupportedWhereInMatch m -> "unsupported `where' syntax: " ++ prettyPrint m EmptyDoBlock -> "empty `do' block" InvalidDoBlock -> "invalid `do' block" FfiNeedsTypeSig d -> "your FFI declaration needs a type signature: " ++ prettyPrint d FfiFormatBadChars srcloc cs -> printSrcLoc srcloc ++ ": invalid characters for FFI format string: " ++ show cs FfiFormatNoSuchArg srcloc i -> printSrcLoc srcloc ++ ": no such argument in FFI format string: " ++ show i FfiFormatIncompleteArg srcloc -> printSrcLoc srcloc ++ ": incomplete `%' syntax in FFI format string" FfiFormatInvalidJavaScript srcloc code err -> printSrcLoc srcloc ++ ":" ++ "\ninvalid JavaScript code in FFI format string:\n" ++ err ++ "\nin " ++ code Couldn'tFindImport i places -> "could not find an import in the path: " ++ prettyPrint i ++ ", \n" ++ "searched in these places: " ++ intercalate ", " places UnableResolveQualified qname -> "unable to resolve qualified names " ++ prettyPrint qname GHCError s -> "ghc: " ++ s -- | Get the JS runtime source. getRuntime :: IO String getRuntime = getDataFileName "js/runtime.js"