{-# LANGUAGE CPP #-} {-# LANGUAGE DeriveDataTypeable #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE RankNTypes #-} {-# LANGUAGE ScopedTypeVariables #-} ----------------------------------------------------------------------------- -- | -- Module : Distribution.PackageDescription.Parse -- Copyright : Isaac Jones 2003-2005 -- License : BSD3 -- -- Maintainer : cabal-devel@haskell.org -- Portability : portable -- -- This defined parsers and partial pretty printers for the @.cabal@ format. -- Some of the complexity in this module is due to the fact that we have to be -- backwards compatible with old @.cabal@ files, so there's code to translate -- into the newer structure. module Distribution.PackageDescription.Parse ( -- * Package descriptions readGenericPackageDescription, parseGenericPackageDescription, -- ** Deprecated names readPackageDescription, parsePackageDescription, -- ** Parsing ParseResult(..), FieldDescr(..), LineNo, -- ** Private, but needed for pretty-printer TestSuiteStanza(..), BenchmarkStanza(..), -- ** Supplementary build information readHookedBuildInfo, parseHookedBuildInfo, pkgDescrFieldDescrs, libFieldDescrs, foreignLibFieldDescrs, executableFieldDescrs, binfoFieldDescrs, sourceRepoFieldDescrs, testSuiteFieldDescrs, benchmarkFieldDescrs, flagFieldDescrs ) where import Prelude () import Distribution.Compat.Prelude import Distribution.Types.Dependency import Distribution.Types.ForeignLib import Distribution.Types.ForeignLibType import Distribution.Types.UnqualComponentName import Distribution.Types.CondTree import Distribution.Types.PackageId import Distribution.ParseUtils hiding (parseFields) import Distribution.PackageDescription import Distribution.PackageDescription.Utils import Distribution.Package import Distribution.ModuleName import Distribution.Version import Distribution.Verbosity import Distribution.Compiler import Distribution.PackageDescription.Configuration import Distribution.Simple.Utils import Distribution.Text import Distribution.Compat.ReadP hiding (get) import Data.List (partition, (\\)) import System.Directory (doesFileExist) import Control.Monad (mapM) import Text.PrettyPrint (vcat, ($$), (<+>), text, render, comma, fsep, nest, ($+$), punctuate) -- ----------------------------------------------------------------------------- -- The PackageDescription type pkgDescrFieldDescrs :: [FieldDescr PackageDescription] pkgDescrFieldDescrs = [ simpleField "name" disp parse packageName (\name pkg -> pkg{package=(package pkg){pkgName=name}}) , simpleField "version" disp parse packageVersion (\ver pkg -> pkg{package=(package pkg){pkgVersion=ver}}) , simpleField "cabal-version" (either disp disp) (liftM Left parse +++ liftM Right parse) specVersionRaw (\v pkg -> pkg{specVersionRaw=v}) , simpleField "build-type" (maybe mempty disp) (fmap Just parse) buildType (\t pkg -> pkg{buildType=t}) , simpleField "license" disp parseLicenseQ license (\l pkg -> pkg{license=l}) -- We have both 'license-file' and 'license-files' fields. -- Rather than declaring license-file to be deprecated, we will continue -- to allow both. The 'license-file' will continue to only allow single -- tokens, while 'license-files' allows multiple. On pretty-printing, we -- will use 'license-file' if there's just one, and use 'license-files' -- otherwise. , simpleField "license-file" showFilePath parseFilePathQ (\pkg -> case licenseFiles pkg of [x] -> x _ -> "") (\l pkg -> pkg{licenseFiles=licenseFiles pkg ++ [l]}) , listField "license-files" showFilePath parseFilePathQ (\pkg -> case licenseFiles pkg of [_] -> [] xs -> xs) (\ls pkg -> pkg{licenseFiles=licenseFiles pkg ++ ls}) , simpleField "copyright" showFreeText parseFreeText copyright (\val pkg -> pkg{copyright=val}) , simpleField "maintainer" showFreeText parseFreeText maintainer (\val pkg -> pkg{maintainer=val}) , simpleField "stability" showFreeText parseFreeText stability (\val pkg -> pkg{stability=val}) , simpleField "homepage" showFreeText parseFreeText homepage (\val pkg -> pkg{homepage=val}) , simpleField "package-url" showFreeText parseFreeText pkgUrl (\val pkg -> pkg{pkgUrl=val}) , simpleField "bug-reports" showFreeText parseFreeText bugReports (\val pkg -> pkg{bugReports=val}) , simpleField "synopsis" showFreeText parseFreeText synopsis (\val pkg -> pkg{synopsis=val}) , simpleField "description" showFreeText parseFreeText description (\val pkg -> pkg{description=val}) , simpleField "category" showFreeText parseFreeText category (\val pkg -> pkg{category=val}) , simpleField "author" showFreeText parseFreeText author (\val pkg -> pkg{author=val}) , listField "tested-with" showTestedWith parseTestedWithQ testedWith (\val pkg -> pkg{testedWith=val}) , listFieldWithSep vcat "data-files" showFilePath parseFilePathQ dataFiles (\val pkg -> pkg{dataFiles=val}) , simpleField "data-dir" showFilePath parseFilePathQ dataDir (\val pkg -> pkg{dataDir=val}) , listFieldWithSep vcat "extra-source-files" showFilePath parseFilePathQ extraSrcFiles (\val pkg -> pkg{extraSrcFiles=val}) , listFieldWithSep vcat "extra-tmp-files" showFilePath parseFilePathQ extraTmpFiles (\val pkg -> pkg{extraTmpFiles=val}) , listFieldWithSep vcat "extra-doc-files" showFilePath parseFilePathQ extraDocFiles (\val pkg -> pkg{extraDocFiles=val}) ] -- | Store any fields beginning with "x-" in the customFields field of -- a PackageDescription. All other fields will generate a warning. storeXFieldsPD :: UnrecFieldParser PackageDescription storeXFieldsPD (f@('x':'-':_),val) pkg = Just pkg{ customFieldsPD = customFieldsPD pkg ++ [(f,val)]} storeXFieldsPD _ _ = Nothing -- --------------------------------------------------------------------------- -- The Library type libFieldDescrs :: [FieldDescr Library] libFieldDescrs = [ listFieldWithSep vcat "exposed-modules" disp parseModuleNameQ exposedModules (\mods lib -> lib{exposedModules=mods}) , commaListFieldWithSep vcat "reexported-modules" disp parse reexportedModules (\mods lib -> lib{reexportedModules=mods}) , listFieldWithSep vcat "signatures" disp parseModuleNameQ signatures (\mods lib -> lib{signatures=mods}) , boolField "exposed" libExposed (\val lib -> lib{libExposed=val}) ] ++ map biToLib binfoFieldDescrs where biToLib = liftField libBuildInfo (\bi lib -> lib{libBuildInfo=bi}) storeXFieldsLib :: UnrecFieldParser Library storeXFieldsLib (f@('x':'-':_), val) l@(Library { libBuildInfo = bi }) = Just $ l {libBuildInfo = bi{ customFieldsBI = customFieldsBI bi ++ [(f,val)]}} storeXFieldsLib _ _ = Nothing -- --------------------------------------------------------------------------- -- Foreign libraries foreignLibFieldDescrs :: [FieldDescr ForeignLib] foreignLibFieldDescrs = [ simpleField "type" disp parse foreignLibType (\x flib -> flib { foreignLibType = x }) , listField "options" disp parse foreignLibOptions (\x flib -> flib { foreignLibOptions = x }) , simpleField "lib-version-info" (maybe mempty disp) (fmap Just parse) foreignLibVersionInfo (\x flib -> flib { foreignLibVersionInfo = x }) , simpleField "lib-version-linux" (maybe mempty disp) (fmap Just parse) foreignLibVersionLinux (\x flib -> flib { foreignLibVersionLinux = x }) , listField "mod-def-file" showFilePath parseFilePathQ foreignLibModDefFile (\x flib -> flib { foreignLibModDefFile = x }) ] ++ map biToFLib binfoFieldDescrs where biToFLib = liftField foreignLibBuildInfo $ \bi flib -> flib { foreignLibBuildInfo = bi } storeXFieldsForeignLib :: UnrecFieldParser ForeignLib storeXFieldsForeignLib (f@('x':'-':_), val) l@(ForeignLib { foreignLibBuildInfo = bi }) = Just $ l { foreignLibBuildInfo = bi { customFieldsBI = (f,val):customFieldsBI bi } } storeXFieldsForeignLib _ _ = Nothing -- --------------------------------------------------------------------------- -- The Executable type executableFieldDescrs :: [FieldDescr Executable] executableFieldDescrs = [ simpleField "main-is" showFilePath parseFilePathQ modulePath (\xs exe -> exe{modulePath=xs}) , simpleField "scope" disp parse exeScope (\sc exe -> exe{exeScope=sc}) ] ++ map biToExe binfoFieldDescrs where biToExe = liftField buildInfo (\bi exe -> exe{buildInfo=bi}) storeXFieldsExe :: UnrecFieldParser Executable storeXFieldsExe (f@('x':'-':_), val) e@(Executable { buildInfo = bi }) = Just $ e {buildInfo = bi{ customFieldsBI = (f,val):customFieldsBI bi}} storeXFieldsExe _ _ = Nothing -- --------------------------------------------------------------------------- -- The TestSuite type -- | An intermediate type just used for parsing the test-suite stanza. -- After validation it is converted into the proper 'TestSuite' type. data TestSuiteStanza = TestSuiteStanza { testStanzaTestType :: Maybe TestType, testStanzaMainIs :: Maybe FilePath, testStanzaTestModule :: Maybe ModuleName, testStanzaBuildInfo :: BuildInfo } emptyTestStanza :: TestSuiteStanza emptyTestStanza = TestSuiteStanza Nothing Nothing Nothing mempty testSuiteFieldDescrs :: [FieldDescr TestSuiteStanza] testSuiteFieldDescrs = [ simpleField "type" (maybe mempty disp) (fmap Just parse) testStanzaTestType (\x suite -> suite { testStanzaTestType = x }) , simpleField "main-is" (maybe mempty showFilePath) (fmap Just parseFilePathQ) testStanzaMainIs (\x suite -> suite { testStanzaMainIs = x }) , simpleField "test-module" (maybe mempty disp) (fmap Just parseModuleNameQ) testStanzaTestModule (\x suite -> suite { testStanzaTestModule = x }) ] ++ map biToTest binfoFieldDescrs where biToTest = liftField testStanzaBuildInfo (\bi suite -> suite { testStanzaBuildInfo = bi }) storeXFieldsTest :: UnrecFieldParser TestSuiteStanza storeXFieldsTest (f@('x':'-':_), val) t@(TestSuiteStanza { testStanzaBuildInfo = bi }) = Just $ t {testStanzaBuildInfo = bi{ customFieldsBI = (f,val):customFieldsBI bi}} storeXFieldsTest _ _ = Nothing validateTestSuite :: LineNo -> TestSuiteStanza -> ParseResult TestSuite validateTestSuite line stanza = case testStanzaTestType stanza of Nothing -> return $ emptyTestSuite { testBuildInfo = testStanzaBuildInfo stanza } Just tt@(TestTypeUnknown _ _) -> return emptyTestSuite { testInterface = TestSuiteUnsupported tt, testBuildInfo = testStanzaBuildInfo stanza } Just tt | tt `notElem` knownTestTypes -> return emptyTestSuite { testInterface = TestSuiteUnsupported tt, testBuildInfo = testStanzaBuildInfo stanza } Just tt@(TestTypeExe ver) -> case testStanzaMainIs stanza of Nothing -> syntaxError line (missingField "main-is" tt) Just file -> do when (isJust (testStanzaTestModule stanza)) $ warning (extraField "test-module" tt) return emptyTestSuite { testInterface = TestSuiteExeV10 ver file, testBuildInfo = testStanzaBuildInfo stanza } Just tt@(TestTypeLib ver) -> case testStanzaTestModule stanza of Nothing -> syntaxError line (missingField "test-module" tt) Just module_ -> do when (isJust (testStanzaMainIs stanza)) $ warning (extraField "main-is" tt) return emptyTestSuite { testInterface = TestSuiteLibV09 ver module_, testBuildInfo = testStanzaBuildInfo stanza } where missingField name tt = "The '" ++ name ++ "' field is required for the " ++ display tt ++ " test suite type." extraField name tt = "The '" ++ name ++ "' field is not used for the '" ++ display tt ++ "' test suite type." -- --------------------------------------------------------------------------- -- The Benchmark type -- | An intermediate type just used for parsing the benchmark stanza. -- After validation it is converted into the proper 'Benchmark' type. data BenchmarkStanza = BenchmarkStanza { benchmarkStanzaBenchmarkType :: Maybe BenchmarkType, benchmarkStanzaMainIs :: Maybe FilePath, benchmarkStanzaBenchmarkModule :: Maybe ModuleName, benchmarkStanzaBuildInfo :: BuildInfo } emptyBenchmarkStanza :: BenchmarkStanza emptyBenchmarkStanza = BenchmarkStanza Nothing Nothing Nothing mempty benchmarkFieldDescrs :: [FieldDescr BenchmarkStanza] benchmarkFieldDescrs = [ simpleField "type" (maybe mempty disp) (fmap Just parse) benchmarkStanzaBenchmarkType (\x suite -> suite { benchmarkStanzaBenchmarkType = x }) , simpleField "main-is" (maybe mempty showFilePath) (fmap Just parseFilePathQ) benchmarkStanzaMainIs (\x suite -> suite { benchmarkStanzaMainIs = x }) ] ++ map biToBenchmark binfoFieldDescrs where biToBenchmark = liftField benchmarkStanzaBuildInfo (\bi suite -> suite { benchmarkStanzaBuildInfo = bi }) storeXFieldsBenchmark :: UnrecFieldParser BenchmarkStanza storeXFieldsBenchmark (f@('x':'-':_), val) t@(BenchmarkStanza { benchmarkStanzaBuildInfo = bi }) = Just $ t {benchmarkStanzaBuildInfo = bi{ customFieldsBI = (f,val):customFieldsBI bi}} storeXFieldsBenchmark _ _ = Nothing validateBenchmark :: LineNo -> BenchmarkStanza -> ParseResult Benchmark validateBenchmark line stanza = case benchmarkStanzaBenchmarkType stanza of Nothing -> return $ emptyBenchmark { benchmarkBuildInfo = benchmarkStanzaBuildInfo stanza } Just tt@(BenchmarkTypeUnknown _ _) -> return emptyBenchmark { benchmarkInterface = BenchmarkUnsupported tt, benchmarkBuildInfo = benchmarkStanzaBuildInfo stanza } Just tt | tt `notElem` knownBenchmarkTypes -> return emptyBenchmark { benchmarkInterface = BenchmarkUnsupported tt, benchmarkBuildInfo = benchmarkStanzaBuildInfo stanza } Just tt@(BenchmarkTypeExe ver) -> case benchmarkStanzaMainIs stanza of Nothing -> syntaxError line (missingField "main-is" tt) Just file -> do when (isJust (benchmarkStanzaBenchmarkModule stanza)) $ warning (extraField "benchmark-module" tt) return emptyBenchmark { benchmarkInterface = BenchmarkExeV10 ver file, benchmarkBuildInfo = benchmarkStanzaBuildInfo stanza } where missingField name tt = "The '" ++ name ++ "' field is required for the " ++ display tt ++ " benchmark type." extraField name tt = "The '" ++ name ++ "' field is not used for the '" ++ display tt ++ "' benchmark type." -- --------------------------------------------------------------------------- -- The BuildInfo type binfoFieldDescrs :: [FieldDescr BuildInfo] binfoFieldDescrs = [ boolField "buildable" buildable (\val binfo -> binfo{buildable=val}) , commaListField "build-tools" disp parse buildTools (\xs binfo -> binfo{buildTools=xs}) , commaListField "build-tool-depends" disp parse buildToolDepends (\xs binfo -> binfo{buildToolDepends=xs}) , commaListFieldWithSep vcat "build-depends" disp parse targetBuildDepends (\xs binfo -> binfo{targetBuildDepends=xs}) , commaListFieldWithSep vcat "mixins" disp parse mixins (\xs binfo -> binfo{mixins=xs}) , spaceListField "cpp-options" showToken parseTokenQ' cppOptions (\val binfo -> binfo{cppOptions=val}) , spaceListField "asm-options" showToken parseTokenQ' asmOptions (\val binfo -> binfo{asmOptions=val}) , spaceListField "cmm-options" showToken parseTokenQ' cmmOptions (\val binfo -> binfo{cmmOptions=val}) , spaceListField "cc-options" showToken parseTokenQ' ccOptions (\val binfo -> binfo{ccOptions=val}) , spaceListField "cxx-options" showToken parseTokenQ' cxxOptions (\val binfo -> binfo{cxxOptions=val}) , spaceListField "ld-options" showToken parseTokenQ' ldOptions (\val binfo -> binfo{ldOptions=val}) , commaListField "pkgconfig-depends" disp parse pkgconfigDepends (\xs binfo -> binfo{pkgconfigDepends=xs}) , listField "frameworks" showToken parseTokenQ frameworks (\val binfo -> binfo{frameworks=val}) , listField "extra-framework-dirs" showToken parseFilePathQ extraFrameworkDirs (\val binfo -> binfo{extraFrameworkDirs=val}) , listFieldWithSep vcat "asm-sources" showFilePath parseFilePathQ asmSources (\paths binfo -> binfo{asmSources=paths}) , listFieldWithSep vcat "cmm-sources" showFilePath parseFilePathQ cmmSources (\paths binfo -> binfo{cmmSources=paths}) , listFieldWithSep vcat "c-sources" showFilePath parseFilePathQ cSources (\paths binfo -> binfo{cSources=paths}) , listFieldWithSep vcat "cxx-sources" showFilePath parseFilePathQ cxxSources (\paths binfo -> binfo{cxxSources=paths}) , listFieldWithSep vcat "js-sources" showFilePath parseFilePathQ jsSources (\paths binfo -> binfo{jsSources=paths}) , simpleField "default-language" (maybe mempty disp) (option Nothing (fmap Just parseLanguageQ)) defaultLanguage (\lang binfo -> binfo{defaultLanguage=lang}) , listField "other-languages" disp parseLanguageQ otherLanguages (\langs binfo -> binfo{otherLanguages=langs}) , listField "default-extensions" disp parseExtensionQ defaultExtensions (\exts binfo -> binfo{defaultExtensions=exts}) , listField "other-extensions" disp parseExtensionQ otherExtensions (\exts binfo -> binfo{otherExtensions=exts}) , listField "extensions" disp parseExtensionQ oldExtensions (\exts binfo -> binfo{oldExtensions=exts}) , listFieldWithSep vcat "extra-libraries" showToken parseTokenQ extraLibs (\xs binfo -> binfo{extraLibs=xs}) , listFieldWithSep vcat "extra-ghci-libraries" showToken parseTokenQ extraGHCiLibs (\xs binfo -> binfo{extraGHCiLibs=xs}) , listFieldWithSep vcat "extra-bundled-libraries" showToken parseTokenQ extraBundledLibs (\xs binfo -> binfo{extraBundledLibs=xs}) , listFieldWithSep vcat "extra-library-flavours" showToken parseTokenQ extraLibFlavours (\xs binfo -> binfo{extraLibFlavours=xs}) , listField "extra-lib-dirs" showFilePath parseFilePathQ extraLibDirs (\xs binfo -> binfo{extraLibDirs=xs}) , listFieldWithSep vcat "includes" showFilePath parseFilePathQ includes (\paths binfo -> binfo{includes=paths}) , listFieldWithSep vcat "install-includes" showFilePath parseFilePathQ installIncludes (\paths binfo -> binfo{installIncludes=paths}) , listField "include-dirs" showFilePath parseFilePathQ includeDirs (\paths binfo -> binfo{includeDirs=paths}) , listField "hs-source-dirs" showFilePath parseFilePathQ hsSourceDirs (\paths binfo -> binfo{hsSourceDirs=paths}) , listFieldWithSep vcat "other-modules" disp parseModuleNameQ otherModules (\val binfo -> binfo{otherModules=val}) , listFieldWithSep vcat "virtual-modules" disp parseModuleNameQ virtualModules (\val binfo -> binfo{virtualModules=val}) , listFieldWithSep vcat "autogen-modules" disp parseModuleNameQ autogenModules (\val binfo -> binfo{autogenModules=val}) , optsField "ghc-prof-options" GHC profOptions (\val binfo -> binfo{profOptions=val}) , optsField "ghcjs-prof-options" GHCJS profOptions (\val binfo -> binfo{profOptions=val}) , optsField "ghc-shared-options" GHC sharedOptions (\val binfo -> binfo{sharedOptions=val}) , optsField "ghcjs-shared-options" GHCJS sharedOptions (\val binfo -> binfo{sharedOptions=val}) , optsField "ghc-options" GHC options (\path binfo -> binfo{options=path}) , optsField "ghcjs-options" GHCJS options (\path binfo -> binfo{options=path}) , optsField "jhc-options" JHC options (\path binfo -> binfo{options=path}) -- NOTE: Hugs and NHC are not supported anymore, but these fields are kept -- around for backwards compatibility. , optsField "hugs-options" Hugs options (const id) , optsField "nhc98-options" NHC options (const id) ] storeXFieldsBI :: UnrecFieldParser BuildInfo storeXFieldsBI (f@('x':'-':_),val) bi = Just bi{ customFieldsBI = (f,val):customFieldsBI bi } storeXFieldsBI _ _ = Nothing ------------------------------------------------------------------------------ flagFieldDescrs :: [FieldDescr Flag] flagFieldDescrs = [ simpleField "description" showFreeText parseFreeText flagDescription (\val fl -> fl{ flagDescription = val }) , boolField "default" flagDefault (\val fl -> fl{ flagDefault = val }) , boolField "manual" flagManual (\val fl -> fl{ flagManual = val }) ] ------------------------------------------------------------------------------ sourceRepoFieldDescrs :: [FieldDescr SourceRepo] sourceRepoFieldDescrs = [ simpleField "type" (maybe mempty disp) (fmap Just parse) repoType (\val repo -> repo { repoType = val }) , simpleField "location" (maybe mempty showFreeText) (fmap Just parseFreeText) repoLocation (\val repo -> repo { repoLocation = val }) , simpleField "module" (maybe mempty showToken) (fmap Just parseTokenQ) repoModule (\val repo -> repo { repoModule = val }) , simpleField "branch" (maybe mempty showToken) (fmap Just parseTokenQ) repoBranch (\val repo -> repo { repoBranch = val }) , simpleField "tag" (maybe mempty showToken) (fmap Just parseTokenQ) repoTag (\val repo -> repo { repoTag = val }) , simpleField "subdir" (maybe mempty showFilePath) (fmap Just parseFilePathQ) repoSubdir (\val repo -> repo { repoSubdir = val }) ] ------------------------------------------------------------------------------ setupBInfoFieldDescrs :: [FieldDescr SetupBuildInfo] setupBInfoFieldDescrs = [ commaListFieldWithSep vcat "setup-depends" disp parse setupDepends (\xs binfo -> binfo{setupDepends=xs}) ] -- --------------------------------------------------------------- -- Parsing -- | Given a parser and a filename, return the parse of the file, -- after checking if the file exists. readAndParseFile :: (FilePath -> (String -> IO a) -> IO a) -> (String -> ParseResult a) -> Verbosity -> FilePath -> IO a readAndParseFile withFileContents' parser verbosity fpath = do exists <- doesFileExist fpath unless exists $ die' verbosity $ "Error Parsing: file \"" ++ fpath ++ "\" doesn't exist. Cannot continue." withFileContents' fpath $ \str -> case parser str of ParseFailed e -> do let (line, message) = locatedErrorMsg e dieWithLocation' verbosity fpath line message ParseOk warnings x -> do traverse_ (warn verbosity . showPWarning fpath) $ reverse warnings return x readHookedBuildInfo :: Verbosity -> FilePath -> IO HookedBuildInfo readHookedBuildInfo = readAndParseFile withFileContents parseHookedBuildInfo readPackageDescription :: Verbosity -> FilePath -> IO GenericPackageDescription readPackageDescription = readGenericPackageDescription {-# DEPRECATED readPackageDescription "Use readGenericPackageDescription, old name is misleading." #-} -- | Parse the given package file. readGenericPackageDescription :: Verbosity -> FilePath -> IO GenericPackageDescription readGenericPackageDescription = readAndParseFile withUTF8FileContents parseGenericPackageDescription stanzas :: [Field] -> [[Field]] stanzas [] = [] stanzas (f:fields) = (f:this) : stanzas rest where (this, rest) = break isStanzaHeader fields isStanzaHeader :: Field -> Bool isStanzaHeader (F _ f _) = f == "executable" isStanzaHeader _ = False ------------------------------------------------------------------------------ mapSimpleFields :: (Field -> ParseResult Field) -> [Field] -> ParseResult [Field] mapSimpleFields f = traverse walk where walk fld@F{} = f fld walk (IfBlock l c fs1 fs2) = do fs1' <- traverse walk fs1 fs2' <- traverse walk fs2 return (IfBlock l c fs1' fs2') walk (Section ln n l fs1) = do fs1' <- traverse walk fs1 return (Section ln n l fs1') -- prop_isMapM fs = mapSimpleFields return fs == return fs -- names of fields that represents dependencies -- TODO: maybe build-tools should go here too? constraintFieldNames :: [String] constraintFieldNames = ["build-depends"] -- Possible refactoring would be to have modifiers be explicit about what -- they add and define an accessor that specifies what the dependencies -- are. This way we would completely reuse the parsing knowledge from the -- field descriptor. parseConstraint :: Field -> ParseResult [Dependency] parseConstraint (F l n v) | n `elem` constraintFieldNames = runP l n (parseCommaList parse) v parseConstraint f = userBug $ "Constraint was expected (got: " ++ show f ++ ")" {- headerFieldNames :: [String] headerFieldNames = filter (\n -> not (n `elem` constraintFieldNames)) . map fieldName $ pkgDescrFieldDescrs -} libFieldNames :: [String] libFieldNames = map fieldName libFieldDescrs ++ buildInfoNames ++ constraintFieldNames -- exeFieldNames :: [String] -- exeFieldNames = map fieldName executableFieldDescrs -- ++ buildInfoNames buildInfoNames :: [String] buildInfoNames = map fieldName binfoFieldDescrs ++ map fst deprecatedFieldsBuildInfo -- A minimal implementation of the StateT monad transformer to avoid depending -- on the 'mtl' package. newtype StT s m a = StT { runStT :: s -> m (a,s) } instance Functor f => Functor (StT s f) where fmap g (StT f) = StT $ fmap (first g) . f #if __GLASGOW_HASKELL__ >= 710 instance (Monad m) => Applicative (StT s m) where #else instance (Monad m, Functor m) => Applicative (StT s m) where #endif pure a = StT (\s -> return (a,s)) (<*>) = ap instance Monad m => Monad (StT s m) where #if __GLASGOW_HASKELL__ < 710 return a = StT (\s -> return (a,s)) #endif StT f >>= g = StT $ \s -> do (a,s') <- f s runStT (g a) s' getSt :: Monad m => StT s m s getSt = StT $ \s -> return (s, s) modify :: Monad m => (s -> s) -> StT s m () modify f = StT $ \s -> return ((),f s) lift :: Monad m => m a -> StT s m a lift m = StT $ \s -> m >>= \a -> return (a,s) evalStT :: Monad m => StT s m a -> s -> m a evalStT st s = liftM fst $ runStT st s -- Our monad for parsing a list/tree of fields. -- -- The state represents the remaining fields to be processed. type PM a = StT [Field] ParseResult a -- return look-ahead field or nothing if we're at the end of the file peekField :: PM (Maybe Field) peekField = liftM listToMaybe getSt -- Unconditionally discard the first field in our state. Will error when it -- reaches end of file. (Yes, that's evil.) skipField :: PM () skipField = modify tail --FIXME: this should take a ByteString, not a String. We have to be able to -- decode UTF8 and handle the BOM. parsePackageDescription :: String -> ParseResult GenericPackageDescription parsePackageDescription = parseGenericPackageDescription {-# DEPRECATED parsePackageDescription "Use parseGenericPackageDescription, old name is misleading" #-} -- | Parses the given file into a 'GenericPackageDescription'. -- -- In Cabal 1.2 the syntax for package descriptions was changed to a format -- with sections and possibly indented property descriptions. parseGenericPackageDescription :: String -> ParseResult GenericPackageDescription parseGenericPackageDescription file = do -- This function is quite complex because it needs to be able to parse -- both pre-Cabal-1.2 and post-Cabal-1.2 files. Additionally, it contains -- a lot of parser-related noise since we do not want to depend on Parsec. -- -- If we detect an pre-1.2 file we implicitly convert it to post-1.2 -- style. See 'sectionizeFields' below for details about the conversion. fields0 <- readFields file `catchParseError` \err -> let tabs = findIndentTabs file in case err of -- In case of a TabsError report them all at once. TabsError tabLineNo -> reportTabsError -- but only report the ones including and following -- the one that caused the actual error [ t | t@(lineNo',_) <- tabs , lineNo' >= tabLineNo ] _ -> parseFail err let cabalVersionNeeded = head $ [ minVersionBound versionRange | Just versionRange <- [ simpleParse v | F _ "cabal-version" v <- fields0 ] ] ++ [mkVersion [0]] minVersionBound versionRange = case asVersionIntervals versionRange of [] -> mkVersion [0] ((LowerBound version _, _):_) -> version handleFutureVersionParseFailure cabalVersionNeeded $ do let sf = sectionizeFields fields0 -- ensure 1.2 format -- figure out and warn about deprecated stuff (warnings are collected -- inside our parsing monad) fields <- mapSimpleFields deprecField sf -- Our parsing monad takes the not-yet-parsed fields as its state. -- After each successful parse we remove the field from the state -- ('skipField') and move on to the next one. -- -- Things are complicated a bit, because fields take a tree-like -- structure -- they can be sections or "if"/"else" conditionals. flip evalStT fields $ do -- The header consists of all simple fields up to the first section -- (flag, library, executable). header_fields <- getHeader [] -- Parses just the header fields and stores them in a -- 'PackageDescription'. Note that our final result is a -- 'GenericPackageDescription'; for pragmatic reasons we just store -- the partially filled-out 'PackageDescription' inside the -- 'GenericPackageDescription'. pkg <- lift $ parseFields pkgDescrFieldDescrs storeXFieldsPD emptyPackageDescription header_fields -- 'getBody' assumes that the remaining fields only consist of -- flags, lib and exe sections. (repos, flags, mcsetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg warnIfRest -- warn if getBody did not parse up to the last field. -- warn about using old/new syntax with wrong cabal-version: maybeWarnCabalVersion (not $ oldSyntax fields0) pkg checkForUndefinedFlags flags mlib sub_libs exes tests return $ GenericPackageDescription pkg { sourceRepos = repos, setupBuildInfo = mcsetup } flags mlib sub_libs flibs exes tests bms where oldSyntax = all isSimpleField reportTabsError tabs = syntaxError (fst (head tabs)) $ "Do not use tabs for indentation (use spaces instead)\n" ++ " Tabs were used at (line,column): " ++ show tabs maybeWarnCabalVersion newsyntax pkg | newsyntax && specVersion pkg < mkVersion [1,2] = lift $ warning $ "A package using section syntax must specify at least\n" ++ "'cabal-version: >= 1.2'." maybeWarnCabalVersion newsyntax pkg | not newsyntax && specVersion pkg >= mkVersion [1,2] = lift $ warning $ "A package using 'cabal-version: " ++ displaySpecVersion (specVersionRaw pkg) ++ "' must use section syntax. See the Cabal user guide for details." where displaySpecVersion (Left version) = display version displaySpecVersion (Right versionRange) = case asVersionIntervals versionRange of [] {- impossible -} -> display versionRange ((LowerBound version _, _):_) -> display (orLaterVersion version) maybeWarnCabalVersion _ _ = return () handleFutureVersionParseFailure cabalVersionNeeded parseBody = (unless versionOk (warning message) >> parseBody) `catchParseError` \parseError -> case parseError of TabsError _ -> parseFail parseError _ | versionOk -> parseFail parseError | otherwise -> fail message where versionOk = cabalVersionNeeded <= cabalVersion message = "This package requires at least Cabal version " ++ display cabalVersionNeeded -- "Sectionize" an old-style Cabal file. A sectionized file has: -- -- * all global fields at the beginning, followed by -- -- * all flag declarations, followed by -- -- * an optional library section, and an arbitrary number of executable -- sections (in any order). -- -- The current implementation just gathers all library-specific fields -- in a library section and wraps all executable stanzas in an executable -- section. sectionizeFields :: [Field] -> [Field] sectionizeFields fs | oldSyntax fs = let -- "build-depends" is a local field now. To be backwards -- compatible, we still allow it as a global field in old-style -- package description files and translate it to a local field by -- adding it to every non-empty section (hdr0, exes0) = break ((=="executable") . fName) fs (hdr, libfs0) = partition (not . (`elem` libFieldNames) . fName) hdr0 (deps, libfs) = partition ((== "build-depends") . fName) libfs0 exes = unfoldr toExe exes0 toExe [] = Nothing toExe (F l e n : r) | e == "executable" = let (efs, r') = break ((=="executable") . fName) r in Just (Section l "executable" n (deps ++ efs), r') toExe _ = cabalBug "unexpected input to 'toExe'" in hdr ++ (if null libfs then [] else [Section (lineNo (head libfs)) "library" "" (deps ++ libfs)]) ++ exes | otherwise = fs isSimpleField F{} = True isSimpleField _ = False -- warn if there's something at the end of the file warnIfRest :: PM () warnIfRest = do s <- getSt case s of [] -> return () _ -> lift $ warning "Ignoring trailing declarations." -- add line no. -- all simple fields at the beginning of the file are (considered) header -- fields getHeader :: [Field] -> PM [Field] getHeader acc = peekField >>= \mf -> case mf of Just f@F{} -> skipField >> getHeader (f:acc) _ -> return (reverse acc) -- -- body ::= { repo | flag | library | sub library | foreign library -- | executable | test | bench }+ -- -- The body consists of an optional sequence of declarations of flags and -- an arbitrary number of components -- -- TODO: This method is long due for a rewrite to use a accumulator -- data type, or perhaps some more general way of balling the -- components up. getBody :: PackageDescription -> PM ([SourceRepo], [Flag] ,Maybe SetupBuildInfo ,(Maybe (CondTree ConfVar [Dependency] Library)) ,[(UnqualComponentName, CondTree ConfVar [Dependency] Library)] ,[(UnqualComponentName, CondTree ConfVar [Dependency] ForeignLib)] ,[(UnqualComponentName, CondTree ConfVar [Dependency] Executable)] ,[(UnqualComponentName, CondTree ConfVar [Dependency] TestSuite)] ,[(UnqualComponentName, CondTree ConfVar [Dependency] Benchmark)]) getBody pkg = peekField >>= \mf -> case mf of Just (Section line_no sec_type sec_label sec_fields) | sec_type == "executable" -> do when (null sec_label) $ lift $ syntaxError line_no "'executable' needs one argument (the executable's name)" exename <- lift $ runP line_no "executable" parseTokenQ sec_label flds <- collectFields parseExeFields sec_fields skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg return (repos, flags, csetup, mlib, sub_libs, flibs, (mkUnqualComponentName exename, flds): exes, tests, bms) | sec_type == "foreign-library" -> do when (null sec_label) $ lift $ syntaxError line_no "'foreign-library' needs one argument (the library's name)" libname <- lift $ runP line_no "foreign-library" parseTokenQ sec_label flds <- collectFields parseForeignLibFields sec_fields -- Check that a valid foreign library type has been chosen. A type -- field may be given inside a conditional block, so we must check -- for that before complaining that a type field has not been given. -- The foreign library must always have a valid type, so we need to -- check both the 'then' and 'else' blocks, though the blocks need -- not have the same type. let hasType ts = foreignLibType ts /= foreignLibType mempty if onAllBranches hasType flds then do skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg return (repos, flags, csetup, mlib, sub_libs, (mkUnqualComponentName libname, flds):flibs, exes, tests, bms) else lift $ syntaxError line_no $ "Foreign library \"" ++ libname ++ "\" is missing required field \"type\" or the field " ++ "is not present in all conditional branches. The " ++ "available test types are: " ++ intercalate ", " (map display knownForeignLibTypes) | sec_type == "test-suite" -> do when (null sec_label) $ lift $ syntaxError line_no "'test-suite' needs one argument (the test suite's name)" testname <- lift $ runP line_no "test" parseTokenQ sec_label flds <- collectFields (parseTestFields line_no) sec_fields -- Check that a valid test suite type has been chosen. A type field -- may be given inside a conditional block, so we must check for -- that before complaining that a type field has not been given. The -- test suite must always have a valid type, so we need to check -- both the 'then' and 'else' blocks, though the blocks need not -- have the same type. let hasType ts = testInterface ts /= testInterface mempty if onAllBranches hasType flds then do skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg return (repos, flags, csetup, mlib, sub_libs, flibs, exes, (mkUnqualComponentName testname, flds) : tests, bms) else lift $ syntaxError line_no $ "Test suite \"" ++ testname ++ "\" is missing required field \"type\" or the field " ++ "is not present in all conditional branches. The " ++ "available test types are: " ++ intercalate ", " (map display knownTestTypes) | sec_type == "benchmark" -> do when (null sec_label) $ lift $ syntaxError line_no "'benchmark' needs one argument (the benchmark's name)" benchname <- lift $ runP line_no "benchmark" parseTokenQ sec_label flds <- collectFields (parseBenchmarkFields line_no) sec_fields -- Check that a valid benchmark type has been chosen. A type field -- may be given inside a conditional block, so we must check for -- that before complaining that a type field has not been given. The -- benchmark must always have a valid type, so we need to check both -- the 'then' and 'else' blocks, though the blocks need not have the -- same type. let hasType ts = benchmarkInterface ts /= benchmarkInterface mempty if onAllBranches hasType flds then do skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg return (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, (mkUnqualComponentName benchname, flds) : bms) else lift $ syntaxError line_no $ "Benchmark \"" ++ benchname ++ "\" is missing required field \"type\" or the field " ++ "is not present in all conditional branches. The " ++ "available benchmark types are: " ++ intercalate ", " (map display knownBenchmarkTypes) | sec_type == "library" -> do mb_libname <- if null sec_label then return Nothing -- TODO: relax this parsing so that scoping is handled -- correctly else fmap Just . lift $ runP line_no "library" parseTokenQ sec_label flds <- collectFields parseLibFields sec_fields skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg case mb_libname of Just libname -> return (repos, flags, csetup, mlib, (mkUnqualComponentName libname, flds) : sub_libs, flibs, exes, tests, bms) Nothing -> do when (isJust mlib) $ lift $ syntaxError line_no "There can only be one (public) library section in a package description." return (repos, flags, csetup, Just flds, sub_libs, flibs, exes, tests, bms) | sec_type == "flag" -> do when (null sec_label) $ lift $ syntaxError line_no "'flag' needs one argument (the flag's name)" flag <- lift $ parseFields flagFieldDescrs warnUnrec (emptyFlag (mkFlagName (lowercase sec_label))) sec_fields skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg return (repos, flag:flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) | sec_type == "source-repository" -> do when (null sec_label) $ lift $ syntaxError line_no $ "'source-repository' needs one argument, " ++ "the repo kind which is usually 'head' or 'this'" kind <- case simpleParse sec_label of Just kind -> return kind Nothing -> lift $ syntaxError line_no $ "could not parse repo kind: " ++ sec_label repo <- lift $ parseFields sourceRepoFieldDescrs warnUnrec (emptySourceRepo kind) sec_fields skipField (repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg return (repo:repos, flags, csetup, mlib, sub_libs, flibs, exes, tests, bms) | sec_type == "custom-setup" -> do unless (null sec_label) $ lift $ syntaxError line_no "'setup' expects no argument" flds <- lift $ parseFields setupBInfoFieldDescrs warnUnrec mempty sec_fields skipField (repos, flags, csetup0, mlib, sub_libs, flibs, exes, tests, bms) <- getBody pkg when (isJust csetup0) $ lift $ syntaxError line_no "There can only be one 'custom-setup' section in a package description." return (repos, flags, Just flds, mlib, sub_libs, flibs, exes, tests, bms) | otherwise -> do lift $ warning $ "Ignoring unknown section type: " ++ sec_type skipField getBody pkg Just f@(F {}) -> do _ <- lift $ syntaxError (lineNo f) $ "Plain fields are not allowed in between stanzas: " ++ show f skipField getBody pkg Just f@(IfBlock {}) -> do _ <- lift $ syntaxError (lineNo f) $ "If-blocks are not allowed in between stanzas: " ++ show f skipField getBody pkg Nothing -> return ([], [], Nothing, Nothing, [], [], [], [], []) -- Extracts all fields in a block and returns a 'CondTree'. -- -- We have to recurse down into conditionals and we treat fields that -- describe dependencies specially. collectFields :: ([Field] -> PM a) -> [Field] -> PM (CondTree ConfVar [Dependency] a) collectFields parser allflds = do let simplFlds = [ F l n v | F l n v <- allflds ] condFlds = [ f | f@IfBlock{} <- allflds ] sections = [ s | s@Section{} <- allflds ] traverse_ (\(Section l n _ _) -> lift . warning $ "Unexpected section '" ++ n ++ "' on line " ++ show l) sections a <- parser simplFlds -- Dependencies must be treated specially: when we -- parse into a CondTree, not only do we parse them into -- the targetBuildDepends/etc field inside the -- PackageDescription, but we also have to put the -- combined dependencies into CondTree. -- -- This information is, in principle, redundant, but -- putting it here makes it easier for the constraint -- solver to pick a flag assignment which supports -- all of the dependencies (because it only has -- to check the CondTree, rather than grovel everywhere -- inside the conditional bits). deps <- liftM concat . traverse (lift . parseConstraint) . filter isConstraint $ simplFlds ifs <- traverse processIfs condFlds return (CondNode a deps ifs) where isConstraint (F _ n _) = n `elem` constraintFieldNames isConstraint _ = False processIfs (IfBlock l c t e) = do cnd <- lift $ runP l "if" parseCondition c t' <- collectFields parser t e' <- case e of [] -> return Nothing es -> do fs <- collectFields parser es return (Just fs) return (CondBranch cnd t' e') processIfs _ = cabalBug "processIfs called with wrong field type" parseLibFields :: [Field] -> PM Library parseLibFields = lift . parseFields libFieldDescrs storeXFieldsLib emptyLibrary -- Note: we don't parse the "executable" field here, hence the tail hack. parseExeFields :: [Field] -> PM Executable parseExeFields = lift . parseFields executableFieldDescrs storeXFieldsExe emptyExecutable parseForeignLibFields :: [Field] -> PM ForeignLib parseForeignLibFields = lift . parseFields foreignLibFieldDescrs storeXFieldsForeignLib emptyForeignLib parseTestFields :: LineNo -> [Field] -> PM TestSuite parseTestFields line fields = do x <- lift $ parseFields testSuiteFieldDescrs storeXFieldsTest emptyTestStanza fields lift $ validateTestSuite line x parseBenchmarkFields :: LineNo -> [Field] -> PM Benchmark parseBenchmarkFields line fields = do x <- lift $ parseFields benchmarkFieldDescrs storeXFieldsBenchmark emptyBenchmarkStanza fields lift $ validateBenchmark line x checkForUndefinedFlags :: [Flag] -> Maybe (CondTree ConfVar [Dependency] Library) -> [(UnqualComponentName, CondTree ConfVar [Dependency] Library)] -> [(UnqualComponentName, CondTree ConfVar [Dependency] Executable)] -> [(UnqualComponentName, CondTree ConfVar [Dependency] TestSuite)] -> PM () checkForUndefinedFlags flags mlib sub_libs exes tests = do let definedFlags = map flagName flags traverse_ (checkCondTreeFlags definedFlags) (maybeToList mlib) traverse_ (checkCondTreeFlags definedFlags . snd) sub_libs traverse_ (checkCondTreeFlags definedFlags . snd) exes traverse_ (checkCondTreeFlags definedFlags . snd) tests checkCondTreeFlags :: [FlagName] -> CondTree ConfVar c a -> PM () checkCondTreeFlags definedFlags ct = do let fv = nub $ freeVars ct unless (all (`elem` definedFlags) fv) $ fail $ "These flags are used without having been defined: " ++ intercalate ", " [ unFlagName fn | fn <- fv \\ definedFlags ] -- Check that a property holds on all branches of a condition tree onAllBranches :: forall v c a. Monoid a => (a -> Bool) -> CondTree v c a -> Bool onAllBranches p = go mempty where -- If the current level of the tree satisfies the property, then we are -- done. If not, then one of the conditional branches below the current node -- must satisfy it. Each node may have multiple immediate children; we only -- one need one to satisfy the property because the configure step uses -- 'mappend' to join together the results of flag resolution. go :: a -> CondTree v c a -> Bool go acc ct = let acc' = acc `mappend` condTreeData ct in p acc' || any (goBranch acc') (condTreeComponents ct) -- Both the 'true' and the 'false' block must satisfy the property. goBranch :: a -> CondBranch v c a -> Bool goBranch _ (CondBranch _ _ Nothing) = False goBranch acc (CondBranch _ t (Just e)) = go acc t && go acc e -- | Parse a list of fields, given a list of field descriptions, -- a structure to accumulate the parsed fields, and a function -- that can decide what to do with fields which don't match any -- of the field descriptions. parseFields :: [FieldDescr a] -- ^ descriptions of fields we know how to -- parse -> UnrecFieldParser a -- ^ possibly do something with -- unrecognized fields -> a -- ^ accumulator -> [Field] -- ^ fields to be parsed -> ParseResult a parseFields descrs unrec ini fields = do (a, unknowns) <- foldM (parseField descrs unrec) (ini, []) fields unless (null unknowns) $ warning $ render $ text "Unknown fields:" <+> commaSep (map (\(l,u) -> u ++ " (line " ++ show l ++ ")") (reverse unknowns)) $+$ text "Fields allowed in this section:" $$ nest 4 (commaSep $ map fieldName descrs) return a where commaSep = fsep . punctuate comma . map text parseField :: [FieldDescr a] -- ^ list of parseable fields -> UnrecFieldParser a -- ^ possibly do something with -- unrecognized fields -> (a,[(Int,String)]) -- ^ accumulated result and warnings -> Field -- ^ the field to be parsed -> ParseResult (a, [(Int,String)]) parseField (FieldDescr name _ parser : fields) unrec (a, us) (F line f val) | name == f = parser line val a >>= \a' -> return (a',us) | otherwise = parseField fields unrec (a,us) (F line f val) parseField [] unrec (a,us) (F l f val) = return $ case unrec (f,val) a of -- no fields matched, see if the 'unrec' Just a' -> (a',us) -- function wants to do anything with it Nothing -> (a, (l,f):us) parseField _ _ _ _ = cabalBug "'parseField' called on a non-field" deprecatedFields :: [(String,String)] deprecatedFields = deprecatedFieldsPkgDescr ++ deprecatedFieldsBuildInfo deprecatedFieldsPkgDescr :: [(String,String)] deprecatedFieldsPkgDescr = [ ("other-files", "extra-source-files") ] deprecatedFieldsBuildInfo :: [(String,String)] deprecatedFieldsBuildInfo = [ ("hs-source-dir","hs-source-dirs") ] -- Handle deprecated fields deprecField :: Field -> ParseResult Field deprecField (F line fld val) = do fld' <- case lookup fld deprecatedFields of Nothing -> return fld Just newName -> do warning $ "The field \"" ++ fld ++ "\" is deprecated, please use \"" ++ newName ++ "\"" return newName return (F line fld' val) deprecField _ = cabalBug "'deprecField' called on a non-field" parseHookedBuildInfo :: String -> ParseResult HookedBuildInfo parseHookedBuildInfo inp = do fields <- readFields inp let ss@(mLibFields:exes) = stanzas fields mLib <- parseLib mLibFields biExes <- mapM parseExe (maybe ss (const exes) mLib) return (mLib, biExes) where parseLib :: [Field] -> ParseResult (Maybe BuildInfo) parseLib (bi@(F _ inFieldName _:_)) | lowercase inFieldName /= "executable" = liftM Just (parseBI bi) parseLib _ = return Nothing parseExe :: [Field] -> ParseResult (UnqualComponentName, BuildInfo) parseExe (F line inFieldName mName:bi) | lowercase inFieldName == "executable" = do bis <- parseBI bi return (mkUnqualComponentName mName, bis) | otherwise = syntaxError line "expecting 'executable' at top of stanza" parseExe (_:_) = cabalBug "`parseExe' called on a non-field" parseExe [] = syntaxError 0 "error in parsing buildinfo file. Expected executable stanza" parseBI st = parseFields binfoFieldDescrs storeXFieldsBI emptyBuildInfo st -- replace all tabs used as indentation with whitespace, also return where -- tabs were found findIndentTabs :: String -> [(Int,Int)] findIndentTabs = concatMap checkLine . zip [1..] . lines where checkLine (lineno, l) = let (indent, _content) = span isSpace l tabCols = map fst . filter ((== '\t') . snd) . zip [0..] addLineNo = map (\col -> (lineno,col)) in addLineNo (tabCols indent) --test_findIndentTabs = findIndentTabs $ unlines $ -- [ "foo", " bar", " \t baz", "\t biz\t", "\t\t \t mib" ]