haskell-src-exts-1.23.0: Manipulating Haskell source: abstract syntax, lexer, parser, and pretty-printer

Copyright(c) Niklas Broberg 2009
LicenseBSD-style (see the file LICENSE.txt)
MaintainerNiklas Broberg, d00nibro@chalmers.se
Stabilitystable
Portabilityportable
Safe HaskellSafe
LanguageHaskell98

Language.Haskell.Exts.Fixity

Contents

Description

Fixity information to give the parser so that infix operators can be parsed properly.

Synopsis

Fixity representation

data Fixity Source #

Operator fixities are represented by their associativity (left, right or none) and their precedence (0-9).

Constructors

Fixity (Assoc ()) Int (QName ()) 
Instances
Eq Fixity Source # 
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Defined in Language.Haskell.Exts.Fixity

Methods

(==) :: Fixity -> Fixity -> Bool #

(/=) :: Fixity -> Fixity -> Bool #

Data Fixity Source # 
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Defined in Language.Haskell.Exts.Fixity

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Fixity -> c Fixity #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Fixity #

toConstr :: Fixity -> Constr #

dataTypeOf :: Fixity -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Fixity) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Fixity) #

gmapT :: (forall b. Data b => b -> b) -> Fixity -> Fixity #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Fixity -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Fixity -> r #

gmapQ :: (forall d. Data d => d -> u) -> Fixity -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Fixity -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Fixity -> m Fixity #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Fixity -> m Fixity #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Fixity -> m Fixity #

Ord Fixity Source # 
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Defined in Language.Haskell.Exts.Fixity

Show Fixity Source # 
Instance details

Defined in Language.Haskell.Exts.Fixity

The following three functions all create lists of fixities from textual representations of operators. The intended usage is e.g.

fixs = infixr_ 0  ["$","$!","`seq`"]

Note that the operators are expected as you would write them infix, i.e. with ` characters surrounding varid operators, and varsym operators written as is.

Collections of fixities

preludeFixities :: [Fixity] Source #

All fixities defined in the Prelude.

baseFixities :: [Fixity] Source #

All fixities defined in the base package.

Note that the +++ operator appears in both Control.Arrows and Text.ParserCombinators.ReadP. The listed precedence for +++ in this list is that of Control.Arrows.

Applying fixities to an AST

class AppFixity ast where Source #

All AST elements that may include expressions which in turn may need fixity tweaking will be instances of this class.

Methods

applyFixities Source #

Arguments

:: MonadFail m 
=> [Fixity]

The fixities to account for.

-> ast SrcSpanInfo

The element to tweak.

-> m (ast SrcSpanInfo)

The same element, but with operator expressions updated, or a failure.

Tweak any expressions in the element to account for the fixities given. Assumes that all operator expressions are fully left associative chains to begin with.

Instances
AppFixity Alt Source # 
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Defined in Language.Haskell.Exts.Fixity

AppFixity FieldUpdate Source # 
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AppFixity QualStmt Source # 
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AppFixity Stmt Source # 
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Defined in Language.Haskell.Exts.Fixity

AppFixity PatField Source # 
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Defined in Language.Haskell.Exts.Fixity

AppFixity RPat Source # 
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AppFixity PXAttr Source # 
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AppFixity Pat Source # 
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AppFixity Splice Source # 
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AppFixity Bracket Source # 
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AppFixity XAttr Source # 
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AppFixity Exp Source # 
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AppFixity GuardedRhs Source # 
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AppFixity Rhs Source # 
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AppFixity InstDecl Source # 
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AppFixity ClassDecl Source # 
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AppFixity Match Source # 
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AppFixity IPBind Source # 
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AppFixity Binds Source # 
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AppFixity Annotation Source # 
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AppFixity PatternSynDirection Source # 
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AppFixity Decl Source # 
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AppFixity Module Source # 
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Defined in Language.Haskell.Exts.Fixity