Cabal-1.2.1: Distribution/ParseUtils.hs
{-# OPTIONS -cpp #-}
-----------------------------------------------------------------------------
-- |
-- Module : Distribution.ParseUtils
-- Copyright : (c) The University of Glasgow 2004
--
-- Maintainer : libraries@haskell.org
-- Stability : alpha
-- Portability : portable
--
-- Utilities for parsing PackageDescription and InstalledPackageInfo.
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-- This module is meant to be local-only to Distribution...
-- #hide
module Distribution.ParseUtils (
LineNo, PError(..), PWarning, locatedErrorMsg, syntaxError, warning,
runP, ParseResult(..), catchParseError, parseFail,
Field(..), fName, lineNo,
FieldDescr(..), readFields,
parseFilePathQ, parseTokenQ,
parseModuleNameQ, parseDependency, parsePkgconfigDependency,
parseOptVersion, parsePackageNameQ, parseVersionRangeQ,
parseTestedWithQ, parseLicenseQ, parseExtensionQ,
parseSepList, parseCommaList, parseOptCommaList,
showFilePath, showToken, showTestedWith, showDependency, showFreeText,
field, simpleField, listField, commaListField, optsField, liftField,
parseReadS, parseReadSQ, parseQuoted,
) where
import Distribution.Compiler (CompilerFlavor)
import Distribution.License
import Distribution.Version
import Distribution.Package ( parsePackageName )
import Distribution.Compat.ReadP as ReadP hiding (get)
import Language.Haskell.Extension (Extension)
import Text.PrettyPrint.HughesPJ hiding (braces)
import Data.Char (isSpace, isUpper, toLower, isAlphaNum)
import Data.Maybe ( fromMaybe)
import Data.List (intersperse)
#ifdef DEBUG
import Test.HUnit (Test(..), assertBool, Assertion, runTestTT, Counts, assertEqual)
import IO
import System.Environment ( getArgs )
import Control.Monad ( zipWithM_ )
#endif
-- -----------------------------------------------------------------------------
type LineNo = Int
data PError = AmbigousParse String LineNo
| NoParse String LineNo
| TabsError LineNo
| FromString String (Maybe LineNo)
deriving Show
type PWarning = String
data ParseResult a = ParseFailed PError | ParseOk [PWarning] a
deriving Show
instance Monad ParseResult where
return x = ParseOk [] x
ParseFailed err >>= _ = ParseFailed err
ParseOk ws x >>= f = case f x of
ParseFailed err -> ParseFailed err
ParseOk ws' x' -> ParseOk (ws'++ws) x'
fail s = ParseFailed (FromString s Nothing)
catchParseError :: ParseResult a -> (PError -> ParseResult a)
-> ParseResult a
p@(ParseOk _ _) `catchParseError` _ = p
ParseFailed e `catchParseError` k = k e
parseFail :: PError -> ParseResult a
parseFail = ParseFailed
runP :: LineNo -> String -> ReadP a a -> String -> ParseResult a
runP line fieldname p s =
case [ x | (x,"") <- results ] of
[a] -> ParseOk [] a
[] -> case [ x | (x,ys) <- results, all isSpace ys ] of
[a] -> ParseOk [] a
[] -> ParseFailed (NoParse fieldname line)
_ -> ParseFailed (AmbigousParse fieldname line)
_ -> ParseFailed (AmbigousParse fieldname line)
where results = readP_to_S p s
locatedErrorMsg :: PError -> (Maybe LineNo, String)
locatedErrorMsg (AmbigousParse f n) = (Just n, "Ambiguous parse in field '"++f++"'")
locatedErrorMsg (NoParse f n) = (Just n, "Parse of field '"++f++"' failed: ")
locatedErrorMsg (TabsError n) = (Just n, "Tab used as indentation.")
locatedErrorMsg (FromString s n) = (n, s)
syntaxError :: LineNo -> String -> ParseResult a
syntaxError n s = ParseFailed $ FromString s (Just n)
tabsError :: LineNo -> ParseResult a
tabsError ln = ParseFailed $ TabsError ln
warning :: String -> ParseResult ()
warning s = ParseOk [s] ()
-- | Field descriptor. The parameter @a@ parameterizes over where the field's
-- value is stored in.
data FieldDescr a
= FieldDescr
{ fieldName :: String
, fieldGet :: a -> Doc
, fieldSet :: LineNo -> String -> a -> ParseResult a
-- ^ @fieldSet n str x@ Parses the field value from the given input
-- string @str@ and stores the result in @x@ if the parse was
-- successful. Otherwise, reports an error on line number @n@.
}
field :: String -> (a -> Doc) -> (ReadP a a) -> FieldDescr a
field name showF readF =
FieldDescr name showF (\line val _st -> runP line name readF val)
-- Lift a field descriptor storing into an 'a' to a field descriptor storing
-- into a 'b'.
liftField :: (b -> a) -> (a -> b -> b) -> FieldDescr a -> FieldDescr b
liftField get set (FieldDescr name showF parseF)
= FieldDescr name (\b -> showF (get b))
(\line str b -> do
a <- parseF line str (get b)
return (set a b))
-- Parser combinator for simple fields. Takes a field name, a pretty printer,
-- a parser function, an accessor, and a setter, returns a FieldDescr over the
-- compoid structure.
simpleField :: String -> (a -> Doc) -> (ReadP a a)
-> (b -> a) -> (a -> b -> b) -> FieldDescr b
simpleField name showF readF get set
= liftField get set $ field name showF readF
commaListField :: String -> (a -> Doc) -> (ReadP [a] a)
-> (b -> [a]) -> ([a] -> b -> b) -> FieldDescr b
commaListField name showF readF get set =
liftField get set $
field name (fsep . punctuate comma . map showF) (parseCommaList readF)
listField :: String -> (a -> Doc) -> (ReadP [a] a)
-> (b -> [a]) -> ([a] -> b -> b) -> FieldDescr b
listField name showF readF get set =
liftField get set $
field name (fsep . map showF) (parseOptCommaList readF)
optsField :: String -> CompilerFlavor -> (b -> [(CompilerFlavor,[String])]) -> ([(CompilerFlavor,[String])] -> b -> b) -> FieldDescr b
optsField name flavor get set =
liftField (fromMaybe [] . lookup flavor . get)
(\opts b -> set (update flavor opts (get b)) b) $
field name (hsep . map text)
(sepBy parseTokenQ' (munch1 isSpace))
where
update f opts [] = [(f,opts)]
update f opts ((f',opts'):rest)
| f == f' = (f, opts ++ opts') : rest
| otherwise = (f',opts') : update f opts rest
------------------------------------------------------------------------------
-- The data type for our three syntactic categories
data Field
= F LineNo String String
-- ^ A regular @<property>: <value>@ field
| Section LineNo String String [Field]
-- ^ A section with a name and possible parameter. The syntactic
-- structure is:
--
-- @
-- <sectionname> <arg> {
-- <field>*
-- }
-- @
| IfBlock LineNo String [Field] [Field]
-- ^ A conditional block with an optional else branch:
--
-- @
-- if <condition> {
-- <field>*
-- } else {
-- <field>*
-- }
-- @
deriving (Show
,Eq) -- for testing
lineNo :: Field -> LineNo
lineNo (F n _ _) = n
lineNo (Section n _ _ _) = n
lineNo (IfBlock n _ _ _) = n
fName :: Field -> String
fName (F _ n _) = n
fName (Section _ n _ _) = n
fName _ = error "fname: not a field or section"
readFields :: String -> ParseResult [Field]
readFields input =
ifelse
=<< mapM (mkField 0)
=<< mkTree (tokenise input)
where tokenise = concatMap tokeniseLine
. trimLines
. lines
. normaliseLineEndings
-- TODO: should decode UTF8
-- attach line number and determine indentation
trimLines :: [String] -> [(LineNo, Indent, HasTabs, String)]
trimLines ls = [ (lineno, indent, hastabs, (trimTrailing l'))
| (lineno, l) <- zip [1..] ls
, let (sps, l') = span isSpace l
indent = length sps
hastabs = '\t' `elem` sps
, validLine l' ]
where validLine ('-':'-':_) = False -- Comment
validLine [] = False -- blank line
validLine _ = True
-- | We parse generically based on indent level and braces '{' '}'. To do that
-- we split into lines and then '{' '}' tokens and other spans within a line.
data Token =
-- | The 'Line' token is for bits that /start/ a line, eg:
--
-- > "\n blah blah { blah"
--
-- tokenises to:
--
-- > [Line n 2 False "blah blah", OpenBracket, Span n "blah"]
--
-- so lines are the only ones that can have nested layout, since they
-- have a known indentation level.
--
-- eg: we can't have this:
--
-- > if ... {
-- > } else
-- > other
--
-- because other cannot nest under else, since else doesn't start a line
-- so cannot have nested layout. It'd have to be:
--
-- > if ... {
-- > }
-- > else
-- > other
--
-- but that's not so common, people would normally use layout or
-- brackets not both in a single @if else@ construct.
--
-- > if ... { foo : bar }
-- > else
-- > other
--
-- this is ok
Line LineNo Indent HasTabs String
| Span LineNo String -- ^ span in a line, following brackets
| OpenBracket LineNo | CloseBracket LineNo
type Indent = Int
type HasTabs = Bool
-- | Tokenise a single line, splitting on '{' '}' and the spans inbetween.
-- Also trims leading & trailing space on those spans within the line.
tokeniseLine :: (LineNo, Indent, HasTabs, String) -> [Token]
tokeniseLine (n0, i, t, l) = case split n0 l of
(Span _ l':ss) -> Line n0 i t l' :ss
cs -> cs
where split _ "" = []
split n s = case span (\c -> c /='}' && c /= '{') s of
("", '{' : s') -> OpenBracket n : split n s'
(w , '{' : s') -> mkspan n w (OpenBracket n : split n s')
("", '}' : s') -> CloseBracket n : split n s'
(w , '}' : s') -> mkspan n w (CloseBracket n : split n s')
(w , _) -> mkspan n w []
mkspan n s ss | null s' = ss
| otherwise = Span n s' : ss
where s' = trimTrailing (trimLeading s)
trimLeading, trimTrailing :: String -> String
trimLeading = dropWhile isSpace
trimTrailing = reverse . dropWhile isSpace . reverse
-- | Fix different systems silly line ending conventions
normaliseLineEndings :: String -> String
normaliseLineEndings [] = []
normaliseLineEndings ('\r':'\n':s) = '\n' : normaliseLineEndings s -- windows
normaliseLineEndings ('\r':s) = '\n' : normaliseLineEndings s -- old osx
normaliseLineEndings ( c :s) = c : normaliseLineEndings s
type SyntaxTree = Tree (LineNo, HasTabs, String)
-- | Parse the stream of tokens into a tree of them, based on indent \/ layout
mkTree :: [Token] -> ParseResult [SyntaxTree]
mkTree toks =
layout 0 [] toks >>= \(trees, trailing) -> case trailing of
[] -> return trees
OpenBracket n:_ -> syntaxError n "mismatched backets, unexpected {"
CloseBracket n:_ -> syntaxError n "mismatched backets, unexpected }"
-- the following two should never happen:
Span n l :_ -> syntaxError n $ "unexpected span: " ++ show l
Line n _ _ l :_ -> syntaxError n $ "unexpected line: " ++ show l
-- | Parse the stream of tokens into a tree of them, based on indent
-- This parse state expect to be in a layout context, though possibly
-- nested within a braces context so we may still encounter closing braces.
layout :: Indent -- ^ indent level of the parent\/previous line
-> [SyntaxTree] -- ^ accumulating param, trees in this level
-> [Token] -- ^ remaining tokens
-> ParseResult ([SyntaxTree], [Token])
-- ^ collected trees on this level and trailing tokens
layout _ a [] = return (reverse a, [])
layout i a (s@(Line _ i' _ _):ss) | i' < i = return (reverse a, s:ss)
layout i a (Line n _ t l:OpenBracket n':ss) = do
(sub, ss') <- braces n' [] ss
layout i (Node (n,t,l) sub:a) ss'
layout i a (Span n l:OpenBracket n':ss) = do
(sub, ss') <- braces n' [] ss
layout i (Node (n,False,l) sub:a) ss'
-- look ahead to see if following lines are more indented, giving a sub-tree
layout i a (Line n i' t l:ss) = do
lookahead <- layout (i'+1) [] ss
case lookahead of
([], _) -> layout i (Node (n,t,l) [] :a) ss
(ts, ss') -> layout i (Node (n,t,l) ts :a) ss'
layout _ _ ( OpenBracket n :_) = syntaxError n $ "unexpected '{'"
layout _ a (s@(CloseBracket _):ss) = return (reverse a, s:ss)
layout _ _ ( Span n l : _) = syntaxError n $ "unexpected span: "
++ show l
-- | Parse the stream of tokens into a tree of them, based on explicit braces
-- This parse state expects to find a closing bracket.
braces :: LineNo -- ^ line of the '{', used for error messages
-> [SyntaxTree] -- ^ accumulating param, trees in this level
-> [Token] -- ^ remaining tokens
-> ParseResult ([SyntaxTree],[Token])
-- ^ collected trees on this level and trailing tokens
braces m a (Line n _ t l:OpenBracket n':ss) = do
(sub, ss') <- braces n' [] ss
braces m (Node (n,t,l) sub:a) ss'
braces m a (Span n l:OpenBracket n':ss) = do
(sub, ss') <- braces n' [] ss
braces m (Node (n,False,l) sub:a) ss'
braces m a (Line n i t l:ss) = do
lookahead <- layout (i+1) [] ss
case lookahead of
([], _) -> braces m (Node (n,t,l) [] :a) ss
(ts, ss') -> braces m (Node (n,t,l) ts :a) ss'
braces m a (Span n l:ss) = braces m (Node (n,False,l) []:a) ss
braces _ a (CloseBracket _:ss) = return (reverse a, ss)
braces n _ [] = syntaxError n $ "opening brace '{'"
++ "has no matching closing brace '}'"
braces _ _ (OpenBracket n:_) = syntaxError n "unexpected '{'"
-- | Convert the parse tree into the Field AST
-- Also check for dodgy uses of tabs in indentation.
mkField :: Int -> SyntaxTree -> ParseResult Field
mkField d (Node (n,t,_) _) | d >= 1 && t = tabsError n
mkField d (Node (n,_,l) ts) = case span (\c -> isAlphaNum c || c == '-') l of
([], _) -> syntaxError n $ "unrecognised field or section: " ++ show l
(name, rest) -> case trimLeading rest of
(':':rest') -> do let followingLines = concatMap flatten ts
tabs = not (null [()| (_,True,_) <- followingLines ])
if tabs && d >= 1
then tabsError n
else return $ F n (map toLower name)
(fieldValue rest' followingLines)
rest' -> do ts' <- mapM (mkField (d+1)) ts
return (Section n (map toLower name) rest' ts')
where fieldValue firstLine followingLines =
let firstLine' = trimLeading firstLine
followingLines' = map (\(_,_,s) -> stripDot s) followingLines
allLines | null firstLine' = followingLines'
| otherwise = firstLine' : followingLines'
in (concat . intersperse "\n") allLines
stripDot "." = ""
stripDot s = s
-- | Convert if/then/else 'Section's to 'IfBlock's
ifelse :: [Field] -> ParseResult [Field]
ifelse [] = return []
ifelse (Section n "if" cond thenpart
:Section _ "else" as elsepart:fs)
| null cond = syntaxError n "'if' with missing condition"
| null thenpart = syntaxError n "'then' branch of 'if' is empty"
| not (null as) = syntaxError n "'else' takes no arguments"
| null elsepart = syntaxError n "'else' branch of 'if' is empty"
| otherwise = do tp <- ifelse thenpart
ep <- ifelse elsepart
fs' <- ifelse fs
return (IfBlock n cond tp ep:fs')
ifelse (Section n "if" cond thenpart:fs)
| null cond = syntaxError n "'if' with missing condition"
| null thenpart = syntaxError n "'then' branch of 'if' is empty"
| otherwise = do tp <- ifelse thenpart
fs' <- ifelse fs
return (IfBlock n cond tp []:fs')
ifelse (Section n "else" _ _:_) = syntaxError n "stray 'else' with no preceding 'if'"
ifelse (Section n s a fs':fs) = do fs'' <- ifelse fs'
fs''' <- ifelse fs
return (Section n s a fs'' : fs''')
ifelse (f:fs) = do fs' <- ifelse fs
return (f : fs')
------------------------------------------------------------------------------
-- |parse a module name
parseModuleNameQ :: ReadP r String
parseModuleNameQ = parseQuoted modu <++ modu
where modu = do
c <- satisfy isUpper
cs <- munch (\x -> isAlphaNum x || x `elem` "_'.")
return (c:cs)
parseFilePathQ :: ReadP r FilePath
parseFilePathQ = parseTokenQ
-- removed until normalise is no longer broken, was:
-- liftM normalise parseTokenQ
parseReadS :: Read a => ReadP r a
parseReadS = readS_to_P reads
parseDependency :: ReadP r Dependency
parseDependency = do name <- parsePackageNameQ
skipSpaces
ver <- parseVersionRangeQ <++ return AnyVersion
skipSpaces
return $ Dependency name ver
-- pkg-config allows versions and other letters in package names,
-- eg "gtk+-2.0" is a valid pkg-config package _name_.
-- It then has a package version number like 2.10.13
parsePkgconfigDependency :: ReadP r Dependency
parsePkgconfigDependency = do name <- munch1 (\c -> isAlphaNum c || c `elem` "+-._")
skipSpaces
ver <- parseVersionRangeQ <++ return AnyVersion
skipSpaces
return $ Dependency name ver
parsePackageNameQ :: ReadP r String
parsePackageNameQ = parseQuoted parsePackageName <++ parsePackageName
parseVersionRangeQ :: ReadP r VersionRange
parseVersionRangeQ = parseQuoted parseVersionRange <++ parseVersionRange
parseOptVersion :: ReadP r Version
parseOptVersion = parseQuoted ver <++ ver
where ver = parseVersion <++ return noVersion
noVersion = Version{ versionBranch=[], versionTags=[] }
parseTestedWithQ :: ReadP r (CompilerFlavor,VersionRange)
parseTestedWithQ = parseQuoted tw <++ tw
where tw = do compiler <- parseReadS
skipSpaces
version <- parseVersionRange <++ return AnyVersion
skipSpaces
return (compiler,version)
parseLicenseQ :: ReadP r License
parseLicenseQ = parseQuoted parseReadS <++ parseReadS
-- urgh, we can't define optQuotes :: ReadP r a -> ReadP r a
-- because the "compat" version of ReadP isn't quite powerful enough. In
-- particular, the type of <++ is ReadP r r -> ReadP r a -> ReadP r a
-- Hence the trick above to make 'lic' polymorphic.
parseExtensionQ :: ReadP r Extension
parseExtensionQ = parseQuoted parseReadS <++ parseReadS
-- | Parse something optionally wrapped in quotes.
parseReadSQ :: Read a => ReadP r a
parseReadSQ = parseQuoted parseReadS <++ parseReadS
parseTokenQ :: ReadP r String
parseTokenQ = parseReadS <++ munch1 (\x -> not (isSpace x) && x /= ',')
parseTokenQ' :: ReadP r String
parseTokenQ' = parseReadS <++ munch1 (\x -> not (isSpace x))
parseSepList :: ReadP r b
-> ReadP r a -- ^The parser for the stuff between commas
-> ReadP r [a]
parseSepList sepr p = sepBy p separator
where separator = skipSpaces >> sepr >> skipSpaces
parseCommaList :: ReadP r a -- ^The parser for the stuff between commas
-> ReadP r [a]
parseCommaList = parseSepList (ReadP.char ',')
parseOptCommaList :: ReadP r a -- ^The parser for the stuff between commas
-> ReadP r [a]
parseOptCommaList = parseSepList (optional (ReadP.char ','))
parseQuoted :: ReadP r a -> ReadP r a
parseQuoted p = between (ReadP.char '"') (ReadP.char '"') p
-- --------------------------------------------
-- ** Pretty printing
showFilePath :: FilePath -> Doc
showFilePath = showToken
showToken :: String -> Doc
showToken str
| not (any dodgy str) &&
not (null str) = text str
| otherwise = text (show str)
where dodgy c = isSpace c || c == ','
showTestedWith :: (CompilerFlavor,VersionRange) -> Doc
showTestedWith (compiler,version) = text (show compiler ++ " " ++ showVersionRange version)
showDependency :: Dependency -> Doc
showDependency (Dependency name ver) = text name <+> text (showVersionRange ver)
-- | Pretty-print free-format text, ensuring that it is vertically aligned,
-- and with blank lines replaced by dots for correct re-parsing.
showFreeText :: String -> Doc
showFreeText s = vcat [text (if null l then "." else l) | l <- lines s]
-- --------------------------------------------
-- ** Tree bits
-- Data.Tree was not present in ghc-6.2, and we only need these bits:
data Tree a = Node a (Forest a)
type Forest a = [Tree a]
flatten :: Tree a -> [a]
flatten t = squish t []
where squish (Node x ts) xs = x:foldr squish xs ts
------------------------------------------------------------------------------
-- TESTING
#ifdef DEBUG
test_readFields = case
readFields testFile
of
ParseOk _ x -> x == expectedResult
_ -> False
where
testFile = unlines $
[ "Cabal-version: 3"
, ""
, "Description: This is a test file "
, " with a description longer than two lines. "
, "if os(windows) {"
, " License: You may not use this software"
, " ."
, " If you do use this software you will be seeked and destroyed."
, "}"
, "if os(linux) {"
, " Main-is: foo1 "
, "}"
, ""
, "if os(vista) {"
, " executable RootKit {"
, " Main-is: DRMManager.hs"
, " }"
, "} else {"
, " executable VistaRemoteAccess {"
, " Main-is: VCtrl"
, "}}"
, ""
, "executable Foo-bar {"
, " Main-is: Foo.hs"
, "}"
]
expectedResult =
[ F 1 "cabal-version" "3"
, F 3 "description"
"This is a test file\nwith a description longer than two lines."
, IfBlock 5 "os(windows) "
[ F 6 "license"
"You may not use this software\n\nIf you do use this software you will be seeked and destroyed."
]
[]
, IfBlock 10 "os(linux) "
[ F 11 "main-is" "foo1" ]
[ ]
, IfBlock 14 "os(vista) "
[ Section 15 "executable" "RootKit "
[ F 16 "main-is" "DRMManager.hs"]
]
[ Section 19 "executable" "VistaRemoteAccess "
[F 20 "main-is" "VCtrl"]
]
, Section 23 "executable" "Foo-bar "
[F 24 "main-is" "Foo.hs"]
]
test_readFieldsCompat' = case test_readFieldsCompat of
ParseOk _ fs -> mapM_ (putStrLn . show) fs
x -> putStrLn $ "Failed: " ++ show x
test_readFieldsCompat = readFields testPkgDesc
where
testPkgDesc = unlines [
"-- Required",
"Name: Cabal",
"Version: 0.1.1.1.1-rain",
"License: LGPL",
"License-File: foo",
"Copyright: Free Text String",
"Cabal-version: >1.1.1",
"-- Optional - may be in source?",
"Author: Happy Haskell Hacker",
"Homepage: http://www.haskell.org/foo",
"Package-url: http://www.haskell.org/foo",
"Synopsis: a nice package!",
"Description: a really nice package!",
"Category: tools",
"buildable: True",
"CC-OPTIONS: -g -o",
"LD-OPTIONS: -BStatic -dn",
"Frameworks: foo",
"Tested-with: GHC",
"Stability: Free Text String",
"Build-Depends: haskell-src, HUnit>=1.0.0-rain",
"Other-Modules: Distribution.Package, Distribution.Version,",
" Distribution.Simple.GHCPackageConfig",
"Other-files: file1, file2",
"Extra-Tmp-Files: file1, file2",
"C-Sources: not/even/rain.c, such/small/hands",
"HS-Source-Dirs: src, src2",
"Exposed-Modules: Distribution.Void, Foo.Bar",
"Extensions: OverlappingInstances, TypeSynonymInstances",
"Extra-Libraries: libfoo, bar, bang",
"Extra-Lib-Dirs: \"/usr/local/libs\"",
"Include-Dirs: your/slightest, look/will",
"Includes: /easily/unclose, /me, \"funky, path\\\\name\"",
"Install-Includes: /easily/unclose, /me, \"funky, path\\\\name\"",
"GHC-Options: -fTH -fglasgow-exts",
"Hugs-Options: +TH",
"Nhc-Options: ",
"Jhc-Options: ",
"",
"-- Next is an executable",
"Executable: somescript",
"Main-is: SomeFile.hs",
"Other-Modules: Foo1, Util, Main",
"HS-Source-Dir: scripts",
"Extensions: OverlappingInstances",
"GHC-Options: ",
"Hugs-Options: ",
"Nhc-Options: ",
"Jhc-Options: "
]
{-
test' = do h <- openFile "../Cabal.cabal" ReadMode
s <- hGetContents h
let r = readFields s
case r of
ParseOk _ fs -> mapM_ (putStrLn . show) fs
x -> putStrLn $ "Failed: " ++ show x
putStrLn "==================="
mapM_ (putStrLn . show) $
merge . zip [1..] . lines $ s
hClose h
-}
-- ghc -DDEBUG --make Distribution/ParseUtils.hs -o test
main :: IO ()
main = do
inputFiles <- getArgs
ok <- mapM checkResult inputFiles
zipWithM_ summary inputFiles ok
putStrLn $ show (length (filter not ok)) ++ " out of " ++ show (length ok) ++ " failed"
where summary f True = return ()
summary f False = putStrLn $ f ++ " failed :-("
checkResult :: FilePath -> IO Bool
checkResult inputFile = do
file <- readFile inputFile
case readFields file of
ParseOk _ result -> do
hPutStrLn stderr $ inputFile ++ " parses ok :-)"
return True
ParseFailed err -> do
hPutStrLn stderr $ inputFile ++ " parse failed:"
hPutStrLn stderr $ show err
return False
--
#endif