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module Transfer.CompilerAPI where
import Transfer.Syntax.Lex
import Transfer.Syntax.Par
import Transfer.Syntax.Print
import Transfer.Syntax.Abs
import Transfer.Syntax.Layout
import Transfer.ErrM
import Transfer.SyntaxToCore
import Transfer.PathUtil
import Data.List
import System.Directory
-- | Compile a source module file to a a code file.
compileFile :: [FilePath] -- ^ directories to look for imported modules in
-> FilePath -- ^ source module file
-> IO FilePath -- ^ path to the core file that was written
compileFile path f = do
ds <- loadModule path f
s <- compile ds
writeFile coreFile s
return coreFile
where coreFile = replaceFilenameSuffix f "trc"
-- | Compile a self-contained list of declarations to a core program.
compile :: Monad m => [Decl] -> m String
compile m = return (printTree $ declsToCore m)
-- | Load a source module file and all its dependencies.
loadModule :: [FilePath] -- ^ directories to look for imported modules in
-> FilePath -- ^ source module file
-> IO [Decl]
loadModule = loadModule_ []
where
loadModule_ ms path f =
do
s <- readFile f
Module is ds <- case pModule (myLLexer s) of
Bad e -> fail $ "Parse error in " ++ f ++ ": " ++ e
Ok m -> return m
let load = [ i | Import (Ident i) <- is ] \\ ms
let path' = directoryOf f : path
files <- mapM (findFile path' . (++".tr")) load
dss <- mapM (loadModule_ (load++ms) path) files
return $ concat (dss++[ds])
myLLexer :: String -> [Token]
myLLexer = resolveLayout True . myLexer
-- | Find a file in one of the given directories.
-- Fails if the file was not found.
findFile :: [FilePath] -- ^ directories to look in
-> FilePath -- ^ file name to find
-> IO FilePath
findFile path f =
do
mf <- findFileM path f
case mf of
Nothing -> fail $ f ++ " not found in path: " ++ show path
Just f' -> return f'
-- | Find a file in one of the given directories.
findFileM :: [FilePath] -- ^ directories to look in
-> FilePath -- ^ file name to find
-> IO (Maybe FilePath)
findFileM [] _ = return Nothing
findFileM (p:ps) f =
do
let f' = p ++ "/" ++ f
e <- doesFileExist f'
if e then return (Just f') else findFileM ps f
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