Language.Haskell.TH.Lens

Lenses, Prisms, and Traversals for working with Template Haskell

Traversals

class HasName t where

Has a Name

Methods

name :: Lens' t Name

Extract (or modify) the Name of something

Instances

HasName Name

HasName TyVarBndr

HasName Con

class HasTypeVars t where

Provides for the extraction of free type variables, and alpha renaming.

Methods

typeVarsEx :: Set Name -> Traversal' t Name

When performing substitution into this traversal you're not allowed to substitute in a name that is bound internally or you'll violate the Traversal laws, when in doubt generate your names with newName.

Instances

HasTypeVars Type

HasTypeVars Name

HasTypeVars Pred

HasTypeVars TyVarBndr

HasTypeVars Con

HasTypeVars t => HasTypeVars [t]

HasTypeVars t => HasTypeVars (Maybe t)

class SubstType t where

Provides substitution for types

Methods

substType :: Map Name Type -> t -> t

Perform substitution for types

Instances

SubstType Type

SubstType Pred

SubstType t => SubstType [t]

typeVars :: HasTypeVars t => Traversal' t Name

Traverse free type variables

substTypeVars :: HasTypeVars t => Map Name Name -> t -> t

Substitute using a map of names in for free type variables

conFields :: Traversal' Con StrictType

Provides a Traversal of the types of each field of a constructor.

conNamedFields :: Traversal' Con VarStrictType

Traversal of the types of the named fields of a constructor.

Lenses

Loc Lenses

locFileName :: Lens' Loc String

locPackage :: Lens' Loc String

locModule :: Lens' Loc String

locStart :: Lens' Loc CharPos

locEnd :: Lens' Loc CharPos

FunDep Lenses

funDepInputs :: Lens' FunDep [Name]

funDepOutputs :: Lens' FunDep [Name]

Match Lenses

matchPattern :: Lens' Match Pat

matchBody :: Lens' Match Body

matchDeclarations :: Lens' Match [Dec]

Fixity Lenses

fixityPrecedence :: Lens' Fixity Int

fixityDirection :: Lens' Fixity FixityDirection

Clause Lenses

clausePattern :: Lens' Clause [Pat]

clauseBody :: Lens' Clause Body

clauseDecs :: Lens' Clause [Dec]

FieldExp Lenses

fieldExpName :: Lens' FieldExp Name

fieldExpExpression :: Lens' FieldExp Exp

FieldPat Lenses

fieldPatName :: Lens' FieldPat Name

fieldPatPattern :: Lens' FieldPat Pat

TySynEqn Lenses

tySynEqnPatterns :: Lens' TySynEqn [Type]

tySynEqnResult :: Lens' TySynEqn Type

Prisms

Info Prisms

_ClassI :: Prism' Info (Dec, [InstanceDec])

_ClassOpI :: Prism' Info (Name, Type, ParentName, Fixity)

_TyConI :: Prism' Info Dec

_FamilyI :: Prism' Info (Dec, [InstanceDec])

_PrimTyConI :: Prism' Info (Name, Arity, Unlifted)

_DataConI :: Prism' Info (Name, Type, ParentName, Fixity)

_VarI :: Prism' Info (Name, Type, Maybe Dec, Fixity)

_TyVarI :: Prism' Info (Name, Type)

Dec Prisms

_FunD :: Prism' Dec (Name, [Clause])

_ValD :: Prism' Dec (Pat, Body, [Dec])

_DataD :: Prism' Dec (Cxt, Name, [TyVarBndr], [Con], [Name])

_NewtypeD :: Prism' Dec (Cxt, Name, [TyVarBndr], Con, [Name])

_TySynD :: Prism' Dec (Name, [TyVarBndr], Type)

_ClassD :: Prism' Dec (Cxt, Name, [TyVarBndr], [FunDep], [Dec])

_InstanceD :: Prism' Dec (Cxt, Type, [Dec])

_SigD :: Prism' Dec (Name, Type)

_ForeignD :: Prism' Dec Foreign

_InfixD :: Prism' Dec (Fixity, Name)

_PragmaD :: Prism' Dec Pragma

_FamilyD :: Prism' Dec (FamFlavour, Name, [TyVarBndr], Maybe Kind)

_DataInstD :: Prism' Dec (Cxt, Name, [Type], [Con], [Name])

_NewtypeInstD :: Prism' Dec (Cxt, Name, [Type], Con, [Name])

_TySynInstD :: Prism' Dec (Name, TySynEqn)

_ClosedTypeFamilyD :: Prism' Dec (Name, [TyVarBndr], Maybe Kind, [TySynEqn])

_RoleAnnotD :: Prism' Dec (Name, [Role])

Con Prisms

_NormalC :: Prism' Con (Name, [StrictType])

_RecC :: Prism' Con (Name, [VarStrictType])

_InfixC :: Prism' Con (StrictType, Name, StrictType)

_ForallC :: Prism' Con ([TyVarBndr], Cxt, Con)

Strict Prisms

_IsStrict :: Prism' Strict ()

_NotStrict :: Prism' Strict ()

_Unpacked :: Prism' Strict ()

Foreign Prisms

_ImportF :: Prism' Foreign (Callconv, Safety, String, Name, Type)

_ExportF :: Prism' Foreign (Callconv, String, Name, Type)

Callconv Prisms

_CCall :: Prism' Callconv ()

_StdCall :: Prism' Callconv ()

Safety Prisms

_Unsafe :: Prism' Safety ()

_Safe :: Prism' Safety ()

_Interruptible :: Prism' Safety ()

Pragma Prisms

_InlineP :: Prism' Pragma (Name, Inline, RuleMatch, Phases)

_SpecialiseP :: Prism' Pragma (Name, Type, Maybe Inline, Phases)

_SpecialiseInstP :: Prism' Pragma Type

_RuleP :: Prism' Pragma (String, [RuleBndr], Exp, Exp, Phases)

_AnnP :: Prism' Pragma (AnnTarget, Exp)

Inline Prisms

_NoInline :: Prism' Inline ()

_Inline :: Prism' Inline ()

_Inlinable :: Prism' Inline ()

RuleMatch Prisms

_ConLike :: Prism' RuleMatch ()

_FunLike :: Prism' RuleMatch ()

Phases Prisms

_AllPhases :: Prism' Phases ()

_FromPhase :: Prism' Phases Int

_BeforePhase :: Prism' Phases Int

RuleBndr Prisms

_RuleVar :: Prism' RuleBndr Name

_TypedRuleVar :: Prism' RuleBndr (Name, Type)

AnnTarget Prisms

_ModuleAnnotation :: Prism' AnnTarget ()

_TypeAnnotation :: Prism' AnnTarget Name

_ValueAnnotation :: Prism' AnnTarget Name

FunDep Prisms TODO make a lens

_FunDep :: Prism' FunDep ([Name], [Name])

FamFlavour Prisms

_TypeFam :: Prism' FamFlavour ()

_DataFam :: Prism' FamFlavour ()

FixityDirection Prisms

_InfixL :: Prism' FixityDirection ()

_InfixR :: Prism' FixityDirection ()

_InfixN :: Prism' FixityDirection ()

Exp Prisms

_VarE :: Prism' Exp Name

_ConE :: Prism' Exp Name

_LitE :: Prism' Exp Lit

_AppE :: Prism' Exp (Exp, Exp)

_InfixE :: Prism' Exp (Maybe Exp, Exp, Maybe Exp)

_UInfixE :: Prism' Exp (Exp, Exp, Exp)

_ParensE :: Prism' Exp Exp

_LamE :: Prism' Exp ([Pat], Exp)

_LamCaseE :: Prism' Exp [Match]

_TupE :: Prism' Exp [Exp]

_UnboxedTupE :: Prism' Exp [Exp]

_CondE :: Prism' Exp (Exp, Exp, Exp)

_MultiIfE :: Prism' Exp [(Guard, Exp)]

_LetE :: Prism' Exp ([Dec], Exp)

_CaseE :: Prism' Exp (Exp, [Match])

_DoE :: Prism' Exp [Stmt]

_CompE :: Prism' Exp [Stmt]

_ArithSeqE :: Prism' Exp Range

_ListE :: Prism' Exp [Exp]

_SigE :: Prism' Exp (Exp, Type)

_RecConE :: Prism' Exp (Name, [FieldExp])

_RecUpdE :: Prism' Exp (Exp, [FieldExp])

Body Prisms

_GuardedB :: Prism' Body [(Guard, Exp)]

_NormalB :: Prism' Body Exp

Guard Prisms

_NormalG :: Prism' Guard Exp

_PatG :: Prism' Guard [Stmt]

Stmt Prisms

_BindS :: Prism' Stmt (Pat, Exp)

_LetS :: Prism' Stmt [Dec]

_NoBindS :: Prism' Stmt Exp

_ParS :: Prism' Stmt [[Stmt]]

Range Prisms

_FromR :: Prism' Range Exp

_FromThenR :: Prism' Range (Exp, Exp)

_FromToR :: Prism' Range (Exp, Exp)

_FromThenToR :: Prism' Range (Exp, Exp, Exp)

Lit Prisms

_CharL :: Prism' Lit Char

_StringL :: Prism' Lit String

_IntegerL :: Prism' Lit Integer

_RationalL :: Prism' Lit Rational

_IntPrimL :: Prism' Lit Integer

_WordPrimL :: Prism' Lit Integer

_FloatPrimL :: Prism' Lit Rational

_DoublePrimL :: Prism' Lit Rational

_StringPrimL :: Prism' Lit [Word8]

Pat Prisms

_LitP :: Prism' Pat Lit

_VarP :: Prism' Pat Name

_TupP :: Prism' Pat [Pat]

_UnboxedTupP :: Prism' Pat [Pat]

_ConP :: Prism' Pat (Name, [Pat])

_InfixP :: Prism' Pat (Pat, Name, Pat)

_UInfixP :: Prism' Pat (Pat, Name, Pat)

_ParensP :: Prism' Pat Pat

_TildeP :: Prism' Pat Pat

_BangP :: Prism' Pat Pat

_AsP :: Prism' Pat (Name, Pat)

_WildP :: Prism' Pat ()

_RecP :: Prism' Pat (Name, [FieldPat])

_ListP :: Prism' Pat [Pat]

_SigP :: Prism' Pat (Pat, Type)

_ViewP :: Prism' Pat (Exp, Pat)

Type Prisms

_ForallT :: Prism' Type ([TyVarBndr], Cxt, Type)

_AppT :: Prism' Type (Type, Type)

_SigT :: Prism' Type (Type, Kind)

_VarT :: Prism' Type Name

_ConT :: Prism' Type Name

_PromotedT :: Prism' Type Name

_TupleT :: Prism' Type Int

_UnboxedTupleT :: Prism' Type Int

_ArrowT :: Prism' Type ()

_ListT :: Prism' Type ()

_PromotedTupleT :: Prism' Type Int

_PromotedNilT :: Prism' Type ()

_PromotedConsT :: Prism' Type ()

_StarT :: Prism' Type ()

_ConstraintT :: Prism' Type ()

_LitT :: Prism' Type TyLit

TyVarBndr Prisms

_PlainTV :: Prism' TyVarBndr Name

_KindedTV :: Prism' TyVarBndr (Name, Kind)

TyLit Prisms

_NumTyLit :: Prism' TyLit Integer

_StrTyLit :: Prism' TyLit String

Pred Prisms

_ClassP :: Prism' Pred (Name, [Type])

_EqualP :: Prism' Pred (Type, Type)

Role Prisms

_NominalR :: Prism' Role ()

_RepresentationalR :: Prism' Role ()