Lexer

Documentation

data Token

Constructors

ITas

ITcase

ITclass

ITdata

ITdefault

ITderiving

ITdo

ITelse

IThiding

ITforeign

ITif

ITimport

ITin

ITinfix

ITinfixl

ITinfixr

ITinstance

ITlet

ITmodule

ITnewtype

ITof

ITqualified

ITthen

ITtype

ITwhere

ITforall IsUnicodeSyntax

ITexport

ITlabel

ITdynamic

ITsafe

ITinterruptible

ITunsafe

ITstdcallconv

ITccallconv

ITcapiconv

ITprimcallconv

ITjavascriptcallconv

ITmdo

ITfamily

ITrole

ITgroup

ITby

ITusing

ITpattern

ITstatic

ITstock

ITanyclass

ITunit

ITsignature

ITdependency

ITrequires

ITinline_prag SourceText InlineSpec RuleMatchInfo

ITspec_prag SourceText

ITspec_inline_prag SourceText Bool

ITsource_prag SourceText

ITrules_prag SourceText

ITwarning_prag SourceText

ITdeprecated_prag SourceText

ITline_prag

ITscc_prag SourceText

ITgenerated_prag SourceText

ITcore_prag SourceText

ITunpack_prag SourceText

ITnounpack_prag SourceText

ITann_prag SourceText

ITcomplete_prag SourceText

ITclose_prag

IToptions_prag String

ITinclude_prag String

ITlanguage_prag

ITvect_prag SourceText

ITvect_scalar_prag SourceText

ITnovect_prag SourceText

ITminimal_prag SourceText

IToverlappable_prag SourceText

IToverlapping_prag SourceText

IToverlaps_prag SourceText

ITincoherent_prag SourceText

ITctype SourceText

ITdotdot

ITcolon

ITdcolon IsUnicodeSyntax

ITequal

ITlam

ITlcase

ITvbar

ITlarrow IsUnicodeSyntax

ITrarrow IsUnicodeSyntax

ITat

ITtilde

ITtildehsh

ITdarrow IsUnicodeSyntax

ITminus

ITbang

ITdot

ITbiglam

ITocurly

ITccurly

ITvocurly

ITvccurly

ITobrack

ITopabrack

ITcpabrack

ITcbrack

IToparen

ITcparen

IToubxparen

ITcubxparen

ITsemi

ITcomma

ITunderscore

ITbackquote

ITsimpleQuote

ITvarid FastString

ITconid FastString

ITvarsym FastString

ITconsym FastString

ITqvarid (FastString, FastString)

ITqconid (FastString, FastString)

ITqvarsym (FastString, FastString)

ITqconsym (FastString, FastString)

ITdupipvarid FastString

ITlabelvarid FastString

ITchar SourceText Char

ITstring SourceText FastString

ITinteger SourceText Integer

ITrational FractionalLit

ITprimchar SourceText Char

ITprimstring SourceText ByteString

ITprimint SourceText Integer

ITprimword SourceText Integer

ITprimfloat FractionalLit

ITprimdouble FractionalLit

ITopenExpQuote HasE IsUnicodeSyntax

ITopenPatQuote

ITopenDecQuote

ITopenTypQuote

ITcloseQuote IsUnicodeSyntax

ITopenTExpQuote HasE

ITcloseTExpQuote

ITidEscape FastString

ITparenEscape

ITidTyEscape FastString

ITparenTyEscape

ITtyQuote

ITquasiQuote (FastString, FastString, RealSrcSpan)

ITqQuasiQuote (FastString, FastString, FastString, RealSrcSpan)

ITproc

ITrec

IToparenbar IsUnicodeSyntax

ITcparenbar IsUnicodeSyntax

ITlarrowtail IsUnicodeSyntax

ITrarrowtail IsUnicodeSyntax

ITLarrowtail IsUnicodeSyntax

ITRarrowtail IsUnicodeSyntax

ITtypeApp

ITunknown String

ITeof

ITdocCommentNext String

ITdocCommentPrev String

ITdocCommentNamed String

ITdocSection Int String

ITdocOptions String

ITlineComment String

ITblockComment String

Instances

Show Token

Methods

showsPrec :: Int -> Token -> ShowS

show :: Token -> String

showList :: [Token] -> ShowS

Outputable Token

Methods

ppr :: Token -> SDoc

pprPrec :: Rational -> Token -> SDoc

lexer :: Bool -> (Located Token -> P a) -> P a

pragState :: DynFlags -> StringBuffer -> RealSrcLoc -> PState

mkPState :: DynFlags -> StringBuffer -> RealSrcLoc -> PState

Creates a parse state from a DynFlags value

mkPStatePure :: ParserFlags -> StringBuffer -> RealSrcLoc -> PState

Creates a parse state from a ParserFlags value

data PState

Constructors

PState

Fields

• buffer :: StringBuffer
• options :: ParserFlags
• messages :: DynFlags -> Messages
• tab_first :: Maybe RealSrcSpan
• tab_count :: !Int
• last_tk :: Maybe Token
• last_loc :: RealSrcSpan
• last_len :: !Int
• loc :: RealSrcLoc
• context :: [LayoutContext]
• lex_state :: [Int]
• srcfiles :: [FastString]
• alr_pending_implicit_tokens :: [RealLocated Token]
• alr_next_token :: Maybe (RealLocated Token)
• alr_last_loc :: RealSrcSpan
• alr_context :: [ALRContext]
• alr_expecting_ocurly :: Maybe ALRLayout
• alr_justClosedExplicitLetBlock :: Bool
• annotations :: [(ApiAnnKey, [SrcSpan])]
• comment_q :: [Located AnnotationComment]
• annotations_comments :: [(SrcSpan, [Located AnnotationComment])]

newtype P a

Constructors

P

Fields

• unP :: PState -> ParseResult a

Instances

Monad P

Methods

(>>=) :: P a -> (a -> P b) -> P b

(>>) :: P a -> P b -> P b

return :: a -> P a

fail :: String -> P a

Functor P

Methods

fmap :: (a -> b) -> P a -> P b

(<$) :: a -> P b -> P a

MonadFail P

Methods

fail :: String -> P a

Applicative P

Methods

pure :: a -> P a

(<*>) :: P (a -> b) -> P a -> P b

liftA2 :: (a -> b -> c) -> P a -> P b -> P c

(*>) :: P a -> P b -> P b

(<*) :: P a -> P b -> P a

data ParseResult a

Constructors

POk PState a

PFailed SrcSpan MsgDoc

mkParserFlags :: DynFlags -> ParserFlags

Extracts the flag information needed for parsing

data ParserFlags

The subset of the DynFlags used by the parser

Constructors

ParserFlags

Fields

• pWarningFlags :: IntSet
• pExtensionFlags :: IntSet
• pThisPackage :: UnitId

  key of package currently being compiled

• pExtsBitmap :: !ExtsBitmap

  bitmap of permitted extensions

getSrcLoc :: P RealSrcLoc

getPState :: P PState

extopt :: Extension -> ParserFlags -> Bool

Test whether a Extension is set

withThisPackage :: (UnitId -> a) -> P a

failLocMsgP :: RealSrcLoc -> RealSrcLoc -> String -> P a

failSpanMsgP :: SrcSpan -> SDoc -> P a

srcParseFail :: P a

getMessages :: PState -> DynFlags -> Messages

popContext :: P ()

pushModuleContext :: P ()

setLastToken :: RealSrcSpan -> Int -> P ()

setSrcLoc :: RealSrcLoc -> P ()

activeContext :: P Bool

nextIsEOF :: P Bool

getLexState :: P Int

popLexState :: P Int

pushLexState :: Int -> P ()

extension :: (ExtsBitmap -> Bool) -> P Bool

bangPatEnabled :: ExtsBitmap -> Bool

datatypeContextsEnabled :: ExtsBitmap -> Bool

traditionalRecordSyntaxEnabled :: ExtsBitmap -> Bool

explicitForallEnabled :: ExtsBitmap -> Bool

inRulePrag :: ExtsBitmap -> Bool

explicitNamespacesEnabled :: ExtsBitmap -> Bool

patternSynonymsEnabled :: ExtsBitmap -> Bool

sccProfilingOn :: ExtsBitmap -> Bool

hpcEnabled :: ExtsBitmap -> Bool

addWarning :: WarningFlag -> SrcSpan -> SDoc -> P ()

lexTokenStream :: StringBuffer -> RealSrcLoc -> DynFlags -> ParseResult [Located Token]

addAnnotation :: SrcSpan -> AnnKeywordId -> SrcSpan -> P ()

type AddAnn = SrcSpan -> P ()

Encapsulated call to addAnnotation, requiring only the SrcSpan of the AST construct the annotation belongs to; together with the AnnKeywordId, this is the key of the annotation map.

This type is useful for places in the parser where it is not yet known what SrcSpan an annotation should be added to. The most common situation is when we are parsing a list: the annotations need to be associated with the AST element that *contains* the list, not the list itself. AddAnn lets us defer adding the annotations until we finish parsing the list and are now parsing the enclosing element; we then apply the AddAnn to associate the annotations. Another common situation is where a common fragment of the AST has been factored out but there is no separate AST node for this fragment (this occurs in class and data declarations). In this case, the annotation belongs to the parent data declaration.

The usual way an AddAnn is created is using the mj ("make jump") function, and then it can be discharged using the ams function.

addAnnsAt :: SrcSpan -> [AddAnn] -> P ()

Given a location and a list of AddAnn, apply them all to the location.

mkParensApiAnn :: SrcSpan -> [AddAnn]

Given a SrcSpan that surrounds a HsPar or HsParTy, generate AddAnn values for the opening and closing bordering on the start and end of the span

commentToAnnotation :: Located Token -> Located AnnotationComment

moveAnnotations :: SrcSpan -> SrcSpan -> P ()

Move the annotations and comments belonging to the old span to the new one.