Portability	portable
Stability	experimental
Maintainer	haddock@projects.haskellorg
Safe Haskell	None

Documentation.Haddock

Contents

Interface
Export items & declarations
Cross-referencing
Instances
Documentation comments
Interface files
Flags and options
Program entry point

Description

The Haddock API: A rudimentory, highly experimental API exposing some of the internals of Haddock. Don't expect it to be stable.

Synopsis

Interface

data Interface

Interface holds all information used to render a single Haddock page. It represents the interface of a module. The core business of Haddock lies in creating this structure. Note that the record contains some fields that are only used to create the final record, and that are not used by the backends.

Constructors

Interface

Fields

ifaceMod :: !Module: The module behind this interface.
ifaceOrigFilename :: !FilePath: Original file name of the module.
ifaceInfo :: !(HaddockModInfo Name): Textual information about the module.
ifaceDoc :: !(Documentation Name): Documentation header.
ifaceRnDoc :: !(Documentation DocName): Documentation header with cross-reference information.
ifaceOptions :: ![DocOption]: Haddock options for this module (prune, ignore-exports, etc).
ifaceDeclMap :: !(Map Name [LHsDecl Name]): Declarations originating from the module. Excludes declarations without names (instances and stand-alone documentation comments). Includes names of subordinate declarations mapped to their parent declarations.
ifaceDocMap :: !(DocMap Name): Documentation of declarations originating from the module (including subordinates).
ifaceArgMap :: !(ArgMap Name)
ifaceRnDocMap :: !(DocMap DocName): Documentation of declarations originating from the module (including subordinates).
ifaceRnArgMap :: !(ArgMap DocName)
ifaceSubMap :: !(Map Name [Name])
ifaceExportItems :: ![ExportItem Name]
ifaceRnExportItems :: ![ExportItem DocName]
ifaceExports :: ![Name]: All names exported by the module.
ifaceVisibleExports :: ![Name]: All "visible" names exported by the module. A visible name is a name that will show up in the documentation of the module.
ifaceModuleAliases :: !AliasMap: Aliases of module imports as in import A.B.C as C.
ifaceInstances :: ![ClsInst]: Instances exported by the module.
ifaceHaddockCoverage :: !(Int, Int): The number of haddockable and haddocked items in the module, as a tuple. Haddockable items are the exports and the module itself.
ifaceWarningMap :: !WarningMap: Warnings for things defined in this module.

data InstalledInterface

A subset of the fields of Interface that we store in the interface files.

Constructors

InstalledInterface

Fields

instMod :: Module: The module represented by this interface.
instInfo :: HaddockModInfo Name: Textual information about the module.
instDocMap :: DocMap Name: Documentation of declarations originating from the module (including subordinates).
instArgMap :: ArgMap Name
instExports :: [Name]: All names exported by this module.
instVisibleExports :: [Name]: All "visible" names exported by the module. A visible name is a name that will show up in the documentation of the module.
instOptions :: [DocOption]: Haddock options for this module (prune, ignore-exports, etc).
instSubMap :: Map Name [Name]

Instances

Binary InstalledInterface

createInterfaces

Arguments

:: [Flag]	A list of command-line flags
-> [String]	File or module names
-> IO [Interface]	Resulting list of interfaces

Create Interface structures from a given list of Haddock command-line flags and file or module names (as accepted by haddock executable). Flags that control documentation generation or show help or version information are ignored.

processModules

Arguments

:: Verbosity	Verbosity of logging to `stdout`
-> [String]	A list of file or module names sorted by module topology
-> [Flag]	Command-line flags
-> [InterfaceFile]	Interface files of package dependencies
-> Ghc ([Interface], LinkEnv)	Resulting list of interfaces and renaming environment

Create Interfaces and a link environment by typechecking the list of modules using the GHC API and processing the resulting syntax trees.

Export items & declarations

data ExportItem name

Constructors

ExportDecl	An exported declaration.
Fields expItemDecl :: !(LHsDecl name) A declaration. expItemMbDoc :: !(DocForDecl name) Maybe a doc comment, and possibly docs for arguments (if this decl is a function or type-synonym). expItemSubDocs :: ![(name, DocForDecl name)] Subordinate names, possibly with documentation. expItemInstances :: ![DocInstance name] Instances relevant to this declaration, possibly with documentation.
ExportNoDecl	An exported entity for which we have no documentation (perhaps because it resides in another package).
Fields expItemName :: !name expItemSubs :: ![name] Subordinate names.
ExportGroup	A section heading.
Fields expItemSectionLevel :: !Int Section level (1, 2, 3, ...). expItemSectionId :: !String Section id (for hyperlinks). expItemSectionText :: !(Doc name) Section heading text.
ExportDoc !(Doc name)	Some documentation.
ExportModule !Module	A cross-reference to another module.

type DocForDecl name = (Documentation name, FnArgsDoc name)

type FnArgsDoc name = Map Int (Doc name)

Arguments and result are indexed by Int, zero-based from the left, because that's the easiest to use when recursing over types.

Cross-referencing

type LinkEnv = Map Name Module

Type of environment used to cross-reference identifiers in the syntax.

data DocName

Extends Name with cross-reference information.

Constructors

Documented Name Module	This thing is part of the (existing or resulting) documentation. The `Module` is the preferred place in the documentation to refer to.
Undocumented Name	This thing is not part of the (existing or resulting) documentation, as far as Haddock knows.

Instances

Eq DocName
NamedThing DocName
Binary DocName

Instances

type DocInstance name = (InstHead name, Maybe (Doc name))

An instance head that may have documentation.

type InstHead name = ([HsType name], name, [HsType name])

The head of an instance. Consists of a context, a class name and a list of instance types.

Documentation comments

data Doc id

Constructors

DocEmpty
DocAppend (Doc id) (Doc id)
DocString String
DocParagraph (Doc id)
DocIdentifier id
DocIdentifierUnchecked (ModuleName, OccName)
DocModule String
DocWarning (Doc id)
DocEmphasis (Doc id)
DocMonospaced (Doc id)
DocUnorderedList [Doc id]
DocOrderedList [Doc id]
DocDefList [(Doc id, Doc id)]
DocCodeBlock (Doc id)
DocHyperlink Hyperlink
DocPic String
DocAName String
DocProperty String
DocExamples [Example]

Instances

Functor Doc
Monoid (Doc id)
NFData a => NFData (Doc a)
Binary id => Binary (Doc id)

data Example

Constructors

Example
Fields exampleExpression :: String exampleResult :: [String]

Instances

Eq Example
Show Example
NFData Example
Binary Example

data Hyperlink

Constructors

Hyperlink
Fields hyperlinkUrl :: String hyperlinkLabel :: Maybe String

Instances

Eq Hyperlink
Show Hyperlink
NFData Hyperlink
Binary Hyperlink

data DocMarkup id a

Constructors

Markup

Fields

markupEmpty :: a
markupString :: String -> a
markupParagraph :: a -> a
markupAppend :: a -> a -> a
markupIdentifier :: id -> a
markupIdentifierUnchecked :: (ModuleName, OccName) -> a
markupModule :: String -> a
markupWarning :: a -> a
markupEmphasis :: a -> a
markupMonospaced :: a -> a
markupUnorderedList :: [a] -> a
markupOrderedList :: [a] -> a
markupDefList :: [(a, a)] -> a
markupCodeBlock :: a -> a
markupHyperlink :: Hyperlink -> a
markupAName :: String -> a
markupPic :: String -> a
markupProperty :: String -> a
markupExample :: [Example] -> a

data Documentation name

Constructors

Documentation
Fields documentationDoc :: Maybe (Doc name) documentationWarning :: !(Maybe (Doc name))

Instances

Functor Documentation

type ArgMap a = Map Name (Map Int (Doc a))

type AliasMap = Map Module ModuleName

type WarningMap = DocMap Name

type DocMap a = Map Name (Doc a)

data HaddockModInfo name

Constructors

HaddockModInfo
Fields hmi_description :: Maybe (Doc name) hmi_portability :: Maybe String hmi_stability :: Maybe String hmi_maintainer :: Maybe String hmi_safety :: Maybe String

Instances

Binary name => Binary (HaddockModInfo name)

markup :: DocMarkup id a -> Doc id -> a

Interface files

data InterfaceFile

Constructors

InterfaceFile
Fields ifLinkEnv :: LinkEnv ifInstalledIfaces :: [InstalledInterface]

Instances

Binary InterfaceFile

readInterfaceFile :: forall m. MonadIO m => NameCacheAccessor m -> FilePath -> m (Either String InterfaceFile)

Read a Haddock (.haddock) interface file. Return either an InterfaceFile or an error message.

This function can be called in two ways. Within a GHC session it will update the use and update the session's name cache. Outside a GHC session a new empty name cache is used. The function is therefore generic in the monad being used. The exact monad is whichever monad the first argument, the getter and setter of the name cache, requires.

nameCacheFromGhc :: NameCacheAccessor Ghc

freshNameCache :: NameCacheAccessor IO

type NameCacheAccessor m = (m NameCache, NameCache -> m ())

Flags and options

data DocOption

Source-level options for controlling the documentation.

Constructors

OptHide	This module should not appear in the docs.
OptPrune
OptIgnoreExports	Pretend everything is exported.
OptNotHome	Not the best place to get docs for things exported by this module.

Instances

Eq DocOption
Show DocOption
Binary DocOption

Program entry point

haddock :: [String] -> IO ()

Run Haddock with given list of arguments.

Haddock's own main function is defined in terms of this:

 main = getArgs >>= haddock

Flag_BuiltInThemes
Flag_CSS String
Flag_ReadInterface String
Flag_DumpInterface String
Flag_Heading String
Flag_Html
Flag_Hoogle
Flag_Lib String
Flag_OutputDir FilePath
Flag_Prologue FilePath
Flag_SourceBaseURL String
Flag_SourceModuleURL String
Flag_SourceEntityURL String
Flag_WikiBaseURL String
Flag_WikiModuleURL String
Flag_WikiEntityURL String
Flag_LaTeX
Flag_LaTeXStyle String
Flag_Help
Flag_Verbosity String
Flag_Version
Flag_InterfaceVersion
Flag_UseContents String
Flag_GenContents
Flag_UseIndex String
Flag_GenIndex
Flag_IgnoreAllExports
Flag_HideModule String
Flag_OptGhc String
Flag_GhcLibDir String
Flag_GhcVersion
Flag_PrintGhcPath
Flag_PrintGhcLibDir
Flag_NoWarnings
Flag_UseUnicode
Flag_NoTmpCompDir
Flag_Qualification String
Flag_PrettyHtml