Safe Haskell	None
Language	Haskell2010

Language.Haskell.GHC.ExactPrint.Types

Contents

Core Types
Positions
AnnKey
Internal Types

Synopsis

Core Types

type Anns = Map AnnKey Annotation Source

This structure holds a complete set of annotations for an AST

emptyAnns :: Anns Source

data Annotation Source

Constructors

Ann

Fields

annEntryDelta :: !DeltaPos: Offset used to get to the start of the SrcSpan, from whatever the prior output was, including all annPriorComments (field below).
annPriorComments :: ![(Comment, DeltaPos)]: Comments coming after the last non-comment output of the preceding element but before the SrcSpan being annotated by this Annotation. If these are changed then annEntryDelta (field above) must also change to match.
annFollowingComments :: ![(Comment, DeltaPos)]: Comments coming after the last output for the element subject to this Annotation. These will only be added by AST transformations, and care must be taken not to disturb layout of following elements.
annsDP :: ![(KeywordId, DeltaPos)]: Annotations associated with this element.
annSortKey :: !(Maybe [SrcSpan]): Captures the sort order of sub elements. This is needed when the sub-elements have been split (as in a HsLocalBind which holds separate binds and sigs) or for infix patterns where the order has been re-arranged. It is captured explicitly so that after the Delta phase a SrcSpan is used purely as an index into the annotations, allowing transformations of the AST including the introduction of new Located items or re-arranging existing ones.
annCapturedSpan :: !(Maybe AnnKey): Occasionally we must calculate a SrcSpan for an unlocated list of elements which we must remember for the Print phase. e.g. the statements in a HsLet or HsDo. These must be managed as a group because they all need eo be vertically aligned for the Haskell layout rules, and this guarantees this property in the presence of AST edits.

Instances

Eq Annotation Source
Show Annotation Source
Outputable Annotation Source
Monad m => MonadState (Anns, Int) (TransformT m)

annNone :: Annotation Source

data KeywordId Source

The different syntactic elements which are not represented in the AST.

Constructors

G AnnKeywordId	A normal keyword
AnnSemiSep	A seperating comma
AnnComment Comment
AnnString String	Used to pass information from Delta to Print when we have to work out details from the original SrcSpan.
AnnUnicode AnnKeywordId	Used to indicate that we should print using unicode syntax if possible.

Instances

Eq KeywordId Source
Ord KeywordId Source
Show KeywordId Source
Outputable KeywordId Source

data Comment Source

A Haskell comment. The AnnKeywordId is present if it has been converted from an AnnKeywordId because the annotation must be interleaved into the stream and does not have a well-defined position

Constructors

Comment
Fields commentContents :: !String The contents of the comment including separators commentIdentifier :: !SrcSpan Needed to uniquely identify two comments with the same contents commentOrigin :: !(Maybe AnnKeywordId) We sometimes turn syntax into comments in order to process them properly.

Instances

Eq Comment Source
Data Comment Source
Ord Comment Source
Show Comment Source
Outputable Comment Source

Positions

type Pos = (Int, Int) Source

newtype DeltaPos Source

A relative positions, row then column

Constructors

DP (Int, Int)

Instances

Eq DeltaPos Source
Data DeltaPos Source
Ord DeltaPos Source
Show DeltaPos Source
Outputable DeltaPos Source

deltaRow :: DeltaPos -> Int Source

deltaColumn :: DeltaPos -> Int Source

AnnKey

data AnnKey Source

For every Located a, use the SrcSpan and constructor name of a as the key, to store the standard annotation. These are used to maintain context in the AP and EP monads

Constructors

AnnKey SrcSpan AnnConName

Instances

Eq AnnKey Source
Ord AnnKey Source
Show AnnKey Source
Outputable AnnKey Source
Monad m => MonadState (Anns, Int) (TransformT m)

mkAnnKey :: Data a => Located a -> AnnKey Source

Make an unwrapped AnnKey for the LHsDecl case, a normal one otherwise.

data AnnConName Source

Constructors

CN
Fields unConName :: String

Instances

Eq AnnConName Source
Ord AnnConName Source
Show AnnConName Source
Outputable AnnConName Source

annGetConstr :: Data a => a -> AnnConName Source

Internal Types

newtype LayoutStartCol Source

Marks the start column of a layout block.

Constructors

LayoutStartCol
Fields getLayoutStartCol :: Int

Instances

Eq LayoutStartCol Source
Num LayoutStartCol Source
Show LayoutStartCol Source

declFun :: (forall a. Data a => Located a -> b) -> LHsDecl RdrName -> b Source