Language.Haskell.GHC.ExactPrint.Parsers

This module rexposes wrapped parsers from the GHC API. Along with returning the parse result, the corresponding annotations are also returned such that it is then easy to modify the annotations and print the result.

Utility

type Parser a = DynFlags -> FilePath -> String -> Either (SrcSpan, String) (Anns, a)

withDynFlags :: (DynFlags -> a) -> IO a

Provides a safe way to consume a properly initialised set of DynFlags.

myParser fname expr = withDynFlags (\d -> parseExpr d fname expr)

data CppOptions

Constructors

CppOptions

Fields

• cppDefine :: [String]

  CPP #define macros

• cppInclude :: [FilePath]

  CPP Includes directory

• cppFile :: [FilePath]

  CPP pre-include file

defaultCppOptions :: CppOptions

Module Parsers

parseModule :: FilePath -> IO (Either (SrcSpan, String) (Anns, ParsedSource))

This entry point will also work out which language extensions are required and perform CPP processing if necessary.

parseModule = parseModuleWithCpp defaultCppOptions

Note: ParsedSource is a synonym for Located (HsModule RdrName)

parseModuleFromString :: FilePath -> String -> IO (Either (SrcSpan, String) (Anns, ParsedSource))

This entry point will work out which language extensions are required but will _not_ perform CPP processing. In contrast to parseModoule the input source is read from the provided string; the FilePath parameter solely exists to provide a name in source location annotations.

parseModuleWithOptions :: DeltaOptions -> FilePath -> IO (Either (SrcSpan, String) (Anns, ParsedSource))

parseModuleWithCpp :: CppOptions -> DeltaOptions -> FilePath -> IO (Either (SrcSpan, String) (Anns, ParsedSource))

Parse a module with specific instructions for the C pre-processor.

Basic Parsers

parseExpr :: Parser (LHsExpr RdrName)

parseImport :: Parser (LImportDecl RdrName)

parseType :: Parser (LHsType RdrName)

parseDecl :: Parser (LHsDecl RdrName)

parsePattern :: Parser (LPat RdrName)

parseStmt :: Parser (ExprLStmt RdrName)

parseWith :: Annotate w => DynFlags -> FilePath -> P (Located w) -> String -> Either (SrcSpan, String) (Anns, Located w)

Wrapper function which returns Annotations along with the parsed element.

Internal

parseModuleApiAnnsWithCpp :: CppOptions -> FilePath -> IO (Either (SrcSpan, String) (ApiAnns, [Comment], DynFlags, ParsedSource))

Low level function which is used in the internal tests. It is advised to use parseModule or parseModuleWithCpp instead of this function.