HsExpr

Contents

Expressions proper

Description

Abstract Haskell syntax for expressions.

Synopsis

Expressions proper

type LHsExpr id = Located (HsExpr id)Source

type PostTcExpr = HsExpr Id Source

PostTcExpr is an evidence expression attached to the syntax tree by the type checker (c.f. postTcType).

type PostTcTable = [(Name, PostTcExpr)]Source

We use a PostTcTable where there are a bunch of pieces of evidence, more than is convenient to keep individually.

noPostTcExpr :: PostTcExpr Source

noPostTcTable :: PostTcTable Source

type SyntaxExpr id = HsExpr idSource

SyntaxExpr is like PostTcExpr, but it's filled in a little earlier, by the renamer. It's used for rebindable syntax.

E.g. (>>=) is filled in before the renamer by the appropriate Name for (>>=), and then instantiated by the type checker with its type args etc

noSyntaxExpr :: SyntaxExpr idSource

type SyntaxTable id = [(Name, SyntaxExpr id)]Source

Currently used only for CmdTop (sigh)

Before the renamer, this list is noSyntaxTable
After the renamer, it takes the form [(std_name, HsVar actual_name)] For example, for the return op of a monad
normal case: (GHC.Base.return, HsVar GHC.Base.return)
with rebindable syntax: (GHC.Base.return, return_22) where return_22 is whatever return is in scope
After the type checker, it takes the form [(std_name, expression)] where expression is the evidence for the method

noSyntaxTable :: SyntaxTable idSource

data HsExpr id Source

A Haskell expression.

Constructors

HsVar id	variable
HsIPVar (IPName id)	implicit parameter
HsOverLit (HsOverLit id)	Overloaded literals
HsLit HsLit	Simple (non-overloaded) literals
HsLam (MatchGroup id)
HsApp (LHsExpr id) (LHsExpr id)
OpApp (LHsExpr id) (LHsExpr id) Fixity (LHsExpr id)
NegApp (LHsExpr id) (SyntaxExpr id)
HsPar (LHsExpr id)
SectionL (LHsExpr id) (LHsExpr id)
SectionR (LHsExpr id) (LHsExpr id)
ExplicitTuple [HsTupArg id] Boxity
HsCase (LHsExpr id) (MatchGroup id)
HsIf (Maybe (SyntaxExpr id)) (LHsExpr id) (LHsExpr id) (LHsExpr id)
HsLet (HsLocalBinds id) (LHsExpr id)
HsDo (HsStmtContext Name) [LStmt id] (LHsExpr id) PostTcType
ExplicitList PostTcType [LHsExpr id]
ExplicitPArr PostTcType [LHsExpr id]
RecordCon (Located id) PostTcExpr (HsRecordBinds id)
RecordUpd (LHsExpr id) (HsRecordBinds id) [DataCon] [PostTcType] [PostTcType]
ExprWithTySig (LHsExpr id) (LHsType id)
ExprWithTySigOut (LHsExpr id) (LHsType Name)
ArithSeq PostTcExpr (ArithSeqInfo id)
PArrSeq PostTcExpr (ArithSeqInfo id)
HsSCC FastString (LHsExpr id)
HsCoreAnn FastString (LHsExpr id)
HsBracket (HsBracket id)
HsBracketOut (HsBracket Name) [PendingSplice]
HsSpliceE (HsSplice id)
HsQuasiQuoteE (HsQuasiQuote id)
HsProc (LPat id) (LHsCmdTop id)
HsArrApp (LHsExpr id) (LHsExpr id) PostTcType HsArrAppType Bool
HsArrForm (LHsExpr id) (Maybe Fixity) [LHsCmdTop id]
HsTick Int [id] (LHsExpr id)
HsBinTick Int Int (LHsExpr id)
HsTickPragma (FastString, (Int, Int), (Int, Int)) (LHsExpr id)
EWildPat
EAsPat (Located id) (LHsExpr id)
EViewPat (LHsExpr id) (LHsExpr id)
ELazyPat (LHsExpr id)
HsType (LHsType id)
HsWrap HsWrapper (HsExpr id)

Instances

Typeable1 HsExpr
Data id => Data (HsExpr id)
OutputableBndr id => Outputable (HsExpr id)

data HsTupArg id Source

Constructors

Present (LHsExpr id)
Missing PostTcType

Instances

Typeable1 HsTupArg
Data id => Data (HsTupArg id)

tupArgPresent :: HsTupArg id -> Bool Source

type PendingSplice = (Name, LHsExpr Id)Source

pprLExpr :: OutputableBndr id => LHsExpr id -> SDoc Source

pprExpr :: OutputableBndr id => HsExpr id -> SDoc Source

isQuietHsExpr :: HsExpr id -> Bool Source

pprBinds :: (OutputableBndr idL, OutputableBndr idR) => HsLocalBindsLR idL idR -> SDoc Source

ppr_lexpr :: OutputableBndr id => LHsExpr id -> SDoc Source

ppr_expr :: OutputableBndr id => HsExpr id -> SDoc Source

pprCmdArg :: OutputableBndr id => HsCmdTop id -> SDoc Source

pa_brackets :: SDoc -> SDoc Source

pprDebugParendExpr :: OutputableBndr id => LHsExpr id -> SDoc Source

pprParendExpr :: OutputableBndr id => LHsExpr id -> SDoc Source

isAtomicHsExpr :: HsExpr id -> Bool Source

type HsCmd id = HsExpr idSource

type LHsCmd id = LHsExpr idSource

data HsArrAppType Source

Constructors

HsHigherOrderApp
HsFirstOrderApp

Instances

Data HsArrAppType
Typeable HsArrAppType

type LHsCmdTop id = Located (HsCmdTop id)Source

data HsCmdTop id Source

Constructors

HsCmdTop (LHsCmd id) [PostTcType] PostTcType (SyntaxTable id)

Instances

Typeable1 HsCmdTop
Data id => Data (HsCmdTop id)
OutputableBndr id => Outputable (HsCmdTop id)

type HsRecordBinds id = HsRecFields id (LHsExpr id)Source

data MatchGroup id Source

Constructors

MatchGroup [LMatch id] PostTcType

Instances

Typeable1 MatchGroup
Data id => Data (MatchGroup id)

type LMatch id = Located (Match id)Source

data Match id Source

Constructors

Match [LPat id] (Maybe (LHsType id)) (GRHSs id)

Instances

Typeable1 Match
Data id => Data (Match id)

isEmptyMatchGroup :: MatchGroup id -> Bool Source

matchGroupArity :: MatchGroup id -> Arity Source

hsLMatchPats :: LMatch id -> [LPat id]Source

data GRHSs id Source

GRHSs are used both for pattern bindings and for Matches

Constructors

GRHSs
Fields grhssGRHSs :: [LGRHS id] Guarded RHSs grhssLocalBinds :: HsLocalBinds id The where clause

Instances

Typeable1 GRHSs
Data id => Data (GRHSs id)

type LGRHS id = Located (GRHS id)Source

data GRHS id Source

Guarded Right Hand Side.

Constructors

GRHS [LStmt id] (LHsExpr id)

Instances

Typeable1 GRHS
Data id => Data (GRHS id)

pprMatches :: (OutputableBndr idL, OutputableBndr idR) => HsMatchContext idL -> MatchGroup idR -> SDoc Source

pprFunBind :: (OutputableBndr idL, OutputableBndr idR) => idL -> Bool -> MatchGroup idR -> SDoc Source

pprPatBind :: (OutputableBndr bndr, OutputableBndr id) => LPat bndr -> GRHSs id -> SDoc Source

pprMatch :: (OutputableBndr idL, OutputableBndr idR) => HsMatchContext idL -> Match idR -> SDoc Source

pprGRHSs :: (OutputableBndr idL, OutputableBndr idR) => HsMatchContext idL -> GRHSs idR -> SDoc Source

pprGRHS :: (OutputableBndr idL, OutputableBndr idR) => HsMatchContext idL -> GRHS idR -> SDoc Source

pp_rhs :: OutputableBndr idR => HsMatchContext idL -> LHsExpr idR -> SDoc Source

type LStmt id = Located (StmtLR id id)Source

type LStmtLR idL idR = Located (StmtLR idL idR)Source

type Stmt id = StmtLR id idSource

data StmtLR idL idR Source

Constructors

BindStmt (LPat idL) (LHsExpr idR) (SyntaxExpr idR) (SyntaxExpr idR)
ExprStmt (LHsExpr idR) (SyntaxExpr idR) PostTcType
LetStmt (HsLocalBindsLR idL idR)
ParStmt [([LStmt idL], [idR])]
TransformStmt [LStmt idL] [idR] (LHsExpr idR) (Maybe (LHsExpr idR))
GroupStmt [LStmt idL] [(idR, idR)] (Maybe (LHsExpr idR)) (Either (LHsExpr idR) (SyntaxExpr idR))
RecStmt
Fields recS_stmts :: [LStmtLR idL idR] recS_later_ids :: [idR] recS_rec_ids :: [idR] recS_bind_fn :: SyntaxExpr idR recS_ret_fn :: SyntaxExpr idR recS_mfix_fn :: SyntaxExpr idR recS_rec_rets :: [PostTcExpr] recS_dicts :: TcEvBinds

Instances

Typeable2 StmtLR
(Data idL, Data idR) => Data (StmtLR idL idR)
(OutputableBndr idL, OutputableBndr idR) => Outputable (StmtLR idL idR)

pprStmt :: (OutputableBndr idL, OutputableBndr idR) => StmtLR idL idR -> SDoc Source

pprTransformStmt :: OutputableBndr id => LHsExpr id -> Maybe (LHsExpr id) -> SDoc Source

pprGroupStmt :: OutputableBndr id => Maybe (LHsExpr id) -> Either (LHsExpr id) (SyntaxExpr is) -> SDoc Source

pprBy :: OutputableBndr id => Maybe (LHsExpr id) -> SDoc Source

pprDo :: OutputableBndr id => HsStmtContext any -> [LStmt id] -> LHsExpr id -> SDoc Source

ppr_do_stmts :: OutputableBndr id => [LStmt id] -> LHsExpr id -> SDoc Source

ppr_lc_stmts :: OutputableBndr id => [LStmt id] -> [SDoc]Source

pprComp :: OutputableBndr id => [LStmt id] -> LHsExpr id -> SDoc Source

data HsSplice id Source

Constructors

HsSplice id (LHsExpr id)

Instances

Typeable1 HsSplice
Data id => Data (HsSplice id)
OutputableBndr id => Outputable (HsSplice id)

pprSplice :: OutputableBndr id => HsSplice id -> SDoc Source

data HsBracket id Source

Constructors

ExpBr (LHsExpr id)
PatBr (LPat id)
DecBrL [LHsDecl id]
DecBrG (HsGroup id)
TypBr (LHsType id)
VarBr id

Instances

Typeable1 HsBracket
Data id => Data (HsBracket id)
OutputableBndr id => Outputable (HsBracket id)

pprHsBracket :: OutputableBndr id => HsBracket id -> SDoc Source

thBrackets :: SDoc -> SDoc -> SDoc Source

data ArithSeqInfo id Source

Constructors

From (LHsExpr id)
FromThen (LHsExpr id) (LHsExpr id)
FromTo (LHsExpr id) (LHsExpr id)
FromThenTo (LHsExpr id) (LHsExpr id) (LHsExpr id)

Instances

Typeable1 ArithSeqInfo
Data id => Data (ArithSeqInfo id)
OutputableBndr id => Outputable (ArithSeqInfo id)

pp_dotdot :: SDoc Source

data HsMatchContext id Source

Constructors

FunRhs id Bool
LambdaExpr
CaseAlt
ProcExpr
PatBindRhs
RecUpd
StmtCtxt (HsStmtContext id)
ThPatQuote

Instances

Typeable1 HsMatchContext
Data id => Data (HsMatchContext id)

data HsStmtContext id Source

Constructors

ListComp
DoExpr
GhciStmt
MDoExpr PostTcTable
PArrComp
PatGuard (HsMatchContext id)
ParStmtCtxt (HsStmtContext id)
TransformStmtCtxt (HsStmtContext id)

Instances

Typeable1 HsStmtContext
Data id => Data (HsStmtContext id)

isDoExpr :: HsStmtContext id -> Bool Source

isListCompExpr :: HsStmtContext id -> Bool Source

matchSeparator :: HsMatchContext id -> SDoc Source

pprMatchContext :: Outputable id => HsMatchContext id -> SDoc Source

pprMatchContextNoun :: Outputable id => HsMatchContext id -> SDoc Source

pprStmtContext :: Outputable id => HsStmtContext id -> SDoc Source

matchContextErrString :: Outputable id => HsMatchContext id -> SDoc Source

pprMatchInCtxt :: (OutputableBndr idL, OutputableBndr idR) => HsMatchContext idL -> Match idR -> SDoc Source

pprStmtInCtxt :: (OutputableBndr idL, OutputableBndr idR) => HsStmtContext idL -> StmtLR idL idR -> SDoc Source