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This commit adds a Suffix newtype to describe suffixes as handled by suffix handlers & preprocessors, and changes the PPSuffixHandler type definition to use it. It also moves some type definitions from Distribution.Simple.PreProcess to the new module Distribution.Simple.PreProcess.Types. As this commit changes the definition of PPSuffixHandler, it will break custom Setup scripts which use the 'hookedPreProcessors' functionality.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -11,21 +11,23 @@ | |
| -- Maintainer : [email protected] | ||
| -- Portability : portable | ||
| -- | ||
| -- This defines a 'PreProcessor' abstraction which represents a pre-processor | ||
| -- that can transform one kind of file into another. There is also a | ||
| -- 'PPSuffixHandler' which is a combination of a file extension and a function | ||
| -- for configuring a 'PreProcessor'. It defines a bunch of known built-in | ||
| -- preprocessors like @cpp@, @cpphs@, @c2hs@, @hsc2hs@, @happy@, @alex@ etc and | ||
| -- lists them in 'knownSuffixHandlers'. On top of this it provides a function | ||
| -- for actually preprocessing some sources given a bunch of known suffix | ||
| -- handlers. This module is not as good as it could be, it could really do with | ||
| -- a rewrite to address some of the problems we have with pre-processors. | ||
| -- This module defines 'PPSuffixHandler', which is a combination of a file | ||
| -- extension and a function for configuring a 'PreProcessor'. It also defines | ||
| -- a bunch of known built-in preprocessors like @cpp@, @cpphs@, @c2hs@, | ||
| -- @hsc2hs@, @happy@, @alex@ etc and lists them in 'knownSuffixHandlers'. | ||
| -- On top of this it provides a function for actually preprocessing some sources | ||
| -- given a bunch of known suffix handlers. | ||
| -- This module is not as good as it could be, it could really do with a rewrite | ||
| -- to address some of the problems we have with pre-processors. | ||
| module Distribution.Simple.PreProcess | ||
| ( preprocessComponent | ||
| , preprocessExtras | ||
| , knownSuffixHandlers | ||
| , ppSuffixes | ||
| , PPSuffixHandler | ||
| , Suffix (..) | ||
| , builtinHaskellSuffixes | ||
| , builtinHaskellBootSuffixes | ||
| , PreProcessor (..) | ||
| , mkSimplePreProcessor | ||
| , runSimplePreProcessor | ||
|
|
@@ -58,6 +60,7 @@ import Distribution.Simple.Compiler | |
| import Distribution.Simple.Errors | ||
| import Distribution.Simple.LocalBuildInfo | ||
| import qualified Distribution.Simple.PackageIndex as PackageIndex | ||
| import Distribution.Simple.PreProcess.Types | ||
| import Distribution.Simple.PreProcess.Unlit | ||
| import Distribution.Simple.Program | ||
| import Distribution.Simple.Program.ResponseFile | ||
|
|
@@ -81,69 +84,6 @@ import System.FilePath | |
| ) | ||
| import System.Info (arch, os) | ||
|
|
||
| -- | The interface to a preprocessor, which may be implemented using an | ||
| -- external program, but need not be. The arguments are the name of | ||
| -- the input file, the name of the output file and a verbosity level. | ||
| -- Here is a simple example that merely prepends a comment to the given | ||
| -- source file: | ||
| -- | ||
| -- > ppTestHandler :: PreProcessor | ||
| -- > ppTestHandler = | ||
| -- > PreProcessor { | ||
| -- > platformIndependent = True, | ||
| -- > runPreProcessor = mkSimplePreProcessor $ \inFile outFile verbosity -> | ||
| -- > do info verbosity (inFile++" has been preprocessed to "++outFile) | ||
| -- > stuff <- readFile inFile | ||
| -- > writeFile outFile ("-- preprocessed as a test\n\n" ++ stuff) | ||
| -- > return ExitSuccess | ||
| -- | ||
| -- We split the input and output file names into a base directory and the | ||
| -- rest of the file name. The input base dir is the path in the list of search | ||
| -- dirs that this file was found in. The output base dir is the build dir where | ||
| -- all the generated source files are put. | ||
| -- | ||
| -- The reason for splitting it up this way is that some pre-processors don't | ||
| -- simply generate one output .hs file from one input file but have | ||
| -- dependencies on other generated files (notably c2hs, where building one | ||
| -- .hs file may require reading other .chi files, and then compiling the .hs | ||
| -- file may require reading a generated .h file). In these cases the generated | ||
| -- files need to embed relative path names to each other (eg the generated .hs | ||
| -- file mentions the .h file in the FFI imports). This path must be relative to | ||
| -- the base directory where the generated files are located, it cannot be | ||
| -- relative to the top level of the build tree because the compilers do not | ||
| -- look for .h files relative to there, ie we do not use \"-I .\", instead we | ||
| -- use \"-I dist\/build\" (or whatever dist dir has been set by the user) | ||
| -- | ||
| -- Most pre-processors do not care of course, so mkSimplePreProcessor and | ||
| -- runSimplePreProcessor functions handle the simple case. | ||
| data PreProcessor = PreProcessor | ||
| { -- Is the output of the pre-processor platform independent? eg happy output | ||
| -- is portable haskell but c2hs's output is platform dependent. | ||
| -- This matters since only platform independent generated code can be | ||
| -- included into a source tarball. | ||
| platformIndependent :: Bool | ||
| , -- TODO: deal with pre-processors that have implementation dependent output | ||
| -- eg alex and happy have --ghc flags. However we can't really include | ||
| -- ghc-specific code into supposedly portable source tarballs. | ||
|
|
||
| ppOrdering | ||
| :: Verbosity | ||
| -> [FilePath] -- Source directories | ||
| -> [ModuleName] -- Module names | ||
| -> IO [ModuleName] -- Sorted modules | ||
|
|
||
| -- ^ This function can reorder /all/ modules, not just those that the | ||
| -- require the preprocessor in question. As such, this function should be | ||
| -- well-behaved and not reorder modules it doesn't have dominion over! | ||
| -- | ||
| -- @since 3.8.1.0 | ||
| , runPreProcessor | ||
| :: (FilePath, FilePath) -- Location of the source file relative to a base dir | ||
| -> (FilePath, FilePath) -- Output file name, relative to an output base dir | ||
| -> Verbosity -- verbosity | ||
| -> IO () -- Should exit if the preprocessor fails | ||
| } | ||
|
|
||
| -- | Just present the modules in the order given; this is the default and it is | ||
| -- appropriate for preprocessors which do not have any sort of dependencies | ||
| -- between modules. | ||
|
|
@@ -184,10 +124,10 @@ runSimplePreProcessor | |
| runSimplePreProcessor pp inFile outFile verbosity = | ||
| runPreProcessor pp (".", inFile) (".", outFile) verbosity | ||
|
|
||
| -- | A preprocessor for turning non-Haskell files with the given extension | ||
| -- into plain Haskell source files. | ||
| -- | A preprocessor for turning non-Haskell files with the given 'Suffix' | ||
| -- (i.e. file extension) into plain Haskell source files. | ||
| type PPSuffixHandler = | ||
| (String, BuildInfo -> LocalBuildInfo -> ComponentLocalBuildInfo -> PreProcessor) | ||
| (Suffix, BuildInfo -> LocalBuildInfo -> ComponentLocalBuildInfo -> PreProcessor) | ||
|
|
||
| -- | Apply preprocessors to the sources from 'hsSourceDirs' for a given | ||
| -- component (lib, exe, or test suite). | ||
|
|
@@ -274,8 +214,7 @@ preprocessComponent pd comp lbi clbi isSrcDist verbosity handlers = | |
| where | ||
| orderingFromHandlers v d hndlrs mods = | ||
| foldM (\acc (_, pp) -> ppOrdering pp v d acc) mods hndlrs | ||
| builtinHaskellSuffixes = ["hs", "lhs", "hsig", "lhsig"] | ||
| builtinCSuffixes = cSourceExtensions | ||
| builtinCSuffixes = map Suffix cSourceExtensions | ||
| builtinSuffixes = builtinHaskellSuffixes ++ builtinCSuffixes | ||
| localHandlers bi = [(ext, h bi lbi clbi) | (ext, h) <- handlers] | ||
| pre dirs dir lhndlrs fp = | ||
|
|
@@ -344,9 +283,9 @@ preprocessFile | |
| -- ^ module file name | ||
| -> Verbosity | ||
| -- ^ verbosity | ||
| -> [String] | ||
| -> [Suffix] | ||
| -- ^ builtin suffixes | ||
| -> [(String, PreProcessor)] | ||
| -> [(Suffix, PreProcessor)] | ||
| -- ^ possible preprocessors | ||
| -> Bool | ||
| -- ^ fail on missing file | ||
|
|
@@ -381,7 +320,7 @@ preprocessFile searchLoc buildLoc forSDist baseFile verbosity builtinSuffixes ha | |
| pp = | ||
| fromMaybe | ||
| (error "Distribution.Simple.PreProcess: Just expected") | ||
| (lookup (safeTail ext) handlers) | ||
| (lookup (Suffix $ safeTail ext) handlers) | ||
| -- Preprocessing files for 'sdist' is different from preprocessing | ||
| -- for 'build'. When preprocessing for sdist we preprocess to | ||
| -- avoid that the user has to have the preprocessors available. | ||
|
|
@@ -901,19 +840,19 @@ standardPP lbi prog args = | |
| } | ||
|
|
||
| -- | Convenience function; get the suffixes of these preprocessors. | ||
| ppSuffixes :: [PPSuffixHandler] -> [String] | ||
| ppSuffixes :: [PPSuffixHandler] -> [Suffix] | ||
| ppSuffixes = map fst | ||
|
|
||
| -- | Standard preprocessors: GreenCard, c2hs, hsc2hs, happy, alex and cpphs. | ||
| knownSuffixHandlers :: [PPSuffixHandler] | ||
| knownSuffixHandlers = | ||
| [ ("gc", ppGreenCard) | ||
| , ("chs", ppC2hs) | ||
| , ("hsc", ppHsc2hs) | ||
| , ("x", ppAlex) | ||
| , ("y", ppHappy) | ||
| , ("ly", ppHappy) | ||
| , ("cpphs", ppCpp) | ||
| [ (Suffix "gc", ppGreenCard) | ||
| , (Suffix "chs", ppC2hs) | ||
| , (Suffix "hsc", ppHsc2hs) | ||
| , (Suffix "x", ppAlex) | ||
| , (Suffix "y", ppHappy) | ||
| , (Suffix "ly", ppHappy) | ||
| , (Suffix "cpphs", ppCpp) | ||
| ] | ||
|
|
||
| -- | Standard preprocessors with possible extra C sources: c2hs, hsc2hs. | ||
|
|
||
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