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|
{-# LANGUAGE ScopedTypeVariables #-}
import Data.List
import GHC.Types.SrcLoc
import GHC hiding (moduleName)
import GHC.Hs.Dump
import GHC.Driver.Session
import Outputable hiding (space)
import System.Environment( getArgs )
import System.Exit
import System.FilePath
usage :: String
usage = unlines
[ "usage: check-ppr (libdir) (file)"
, ""
, "where libdir is the GHC library directory (e.g. the output of"
, "ghc --print-libdir) and file is the file to parse."
]
main :: IO()
main = do
args <- getArgs
case args of
[libdir,fileName] -> testOneFile libdir fileName
_ -> putStrLn usage
testOneFile :: FilePath -> String -> IO ()
testOneFile libdir fileName = do
p <- parseOneFile libdir fileName
let
origAst = showSDoc unsafeGlobalDynFlags
$ showAstData BlankSrcSpan (pm_parsed_source p)
pped = pragmas ++ "\n" ++ pp (pm_parsed_source p)
anns = pm_annotations p
pragmas = getPragmas anns
newFile = dropExtension fileName <.> "ppr" <.> takeExtension fileName
astFile = fileName <.> "ast"
newAstFile = fileName <.> "ast.new"
writeFile astFile origAst
writeFile newFile pped
p' <- parseOneFile libdir newFile
let newAstStr :: String
newAstStr = showSDoc unsafeGlobalDynFlags
$ showAstData BlankSrcSpan (pm_parsed_source p')
writeFile newAstFile newAstStr
if origAst == newAstStr
then do
-- putStrLn "ASTs matched"
exitSuccess
else do
putStrLn "AST Match Failed"
putStrLn "\n===================================\nOrig\n\n"
putStrLn origAst
putStrLn "\n===================================\nNew\n\n"
putStrLn newAstStr
exitFailure
parseOneFile :: FilePath -> FilePath -> IO ParsedModule
parseOneFile libdir fileName = do
let modByFile m =
case ml_hs_file $ ms_location m of
Nothing -> False
Just fn -> fn == fileName
runGhc (Just libdir) $ do
dflags <- getSessionDynFlags
let dflags2 = dflags `gopt_set` Opt_KeepRawTokenStream
_ <- setSessionDynFlags dflags2
addTarget Target { targetId = TargetFile fileName Nothing
, targetAllowObjCode = True
, targetContents = Nothing }
_ <- load LoadAllTargets
graph <- getModuleGraph
let
modSum = case filter modByFile (mgModSummaries graph) of
[x] -> x
xs -> error $ "Can't find module, got:"
++ show (map (ml_hs_file . ms_location) xs)
parseModule modSum
getPragmas :: ApiAnns -> String
getPragmas anns = pragmaStr
where
tokComment (L _ (AnnBlockComment s)) = s
tokComment (L _ (AnnLineComment s)) = s
tokComment _ = ""
comments = map tokComment $ sortRealLocated $ apiAnnRogueComments anns
pragmas = filter (\c -> isPrefixOf "{-#" c ) comments
pragmaStr = intercalate "\n" pragmas
pp :: (Outputable a) => a -> String
pp a = showPpr unsafeGlobalDynFlags a
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