Safe Haskell | None |
---|---|
Language | Haskell2010 |
Generic representation of typed syntax trees
For details, see: A Generic Abstract Syntax Model for Embedded Languages (ICFP 2012, http://www.cse.chalmers.se/~emax/documents/axelsson2012generic.pdf).
- data AST sym sig where
- type ASTF sym a = AST sym (Full a)
- newtype Full a = Full {
- result :: a
- newtype a :-> sig = Partial (a -> sig)
- data SigRep sig where
- class Signature sig where
- type family DenResult sig
- class Symbol sym where
- size :: AST sym sig -> Int
- type family SmartFun sym sig
- type family SmartSig f
- type family SmartSym f :: * -> *
- smartSym' :: forall sig f sym. (Signature sig, f ~ SmartFun sym sig, sig ~ SmartSig f, sym ~ SmartSym f) => sym sig -> f
- data (sym1 :+: sym2) sig where
- class Project sub sup where
- class Project sub sup => sub :<: sup where
- inj :: sub a -> sup a
- smartSym :: (Signature sig, f ~ SmartFun sup sig, sig ~ SmartSig f, sup ~ SmartSym f, sub :<: sup) => sub sig -> f
- data Empty :: * -> *
- data E e where
- liftE :: (forall a. e a -> b) -> E e -> b
- liftE2 :: (forall a b. e a -> e b -> c) -> E e -> E e -> c
- data EF e where
- liftEF :: (forall a. e (Full a) -> b) -> EF e -> b
- liftEF2 :: (forall a b. e (Full a) -> e (Full b) -> c) -> EF e -> EF e -> c
- symType :: Proxy sym -> sym sig -> sym sig
- prjP :: Project sub sup => Proxy sub -> sup sig -> Maybe (sub sig)
Syntax trees
Generic abstract syntax tree, parameterized by a symbol domain
(
represents a partially applied (or unapplied)
symbol, missing at least one argument, while AST
sym (a :->
b))(
represents a fully applied symbol, i.e. a complete syntax tree.AST
sym (Full
a))
Sym :: sym sig -> AST sym sig | |
(:$) :: AST sym (a :-> sig) -> AST sym (Full a) -> AST sym sig infixl 1 |
(:<:) sub sup => sub :<: (AST sup) | |
Project sub sup => Project sub (AST sup) | |
Functor sym => Functor (AST sym) | |
Equality sym => Equality (AST sym) | |
BindingDomain sym => BindingDomain (AST sym) | |
Equality sym => Eq (AST sym a) | |
Render sym => Show (ASTF sym a) | |
Symbol sym => NFData (AST sym sig) | |
Syntactic (ASTF sym a) | |
(Syntactic a, (~) (* -> *) (Domain a) sym, (~) * ia (Internal a), SyntacticN f fi) => SyntacticN (a -> f) (AST sym (Full ia) -> fi) | |
type SmartSym (AST sym sig) = sym | |
type SmartSig (ASTF sym a -> f) = (:->) a (SmartSig f) | |
type SmartSig (AST sym sig) = sig | |
type Domain (ASTF sym a) = sym | |
type Internal (ASTF sym a) = a |
Signature of a fully applied symbol
Functor Full | |
Eq a => Eq (Full a) | |
Show a => Show (Full a) | |
Signature (Full a) | |
Render sym => Show (ASTF sym a) | |
Syntactic (ASTF sym a) | |
Typeable (* -> *) Full | |
(Syntactic a, (~) (* -> *) (Domain a) sym, (~) * ia (Internal a), SyntacticN f fi) => SyntacticN (a -> f) (AST sym (Full ia) -> fi) | |
type SmartFun sym (Full a) = ASTF sym a | |
type LiftReader env (Full a) = Full (Reader env a) | |
type DenotationM m (Full a) = m a | |
type DenResult (Full a) = a | |
type LowerReader (Full a) = Full (UnReader a) | |
type Denotation (Full a) = a | |
type SmartSig (ASTF sym a -> f) = (:->) a (SmartSig f) | |
type Domain (ASTF sym a) = sym | |
type Internal (ASTF sym a) = a |
newtype a :-> sig infixr 9 Source
Signature of a partially applied (or unapplied) symbol
Partial (a -> sig) |
Functor ((:->) a) | |
Signature sig => Signature ((:->) a sig) | |
Typeable (* -> * -> *) (:->) | |
type SmartFun sym ((:->) a sig) = ASTF sym a -> SmartFun sym sig | |
type LiftReader env ((:->) a sig) = (:->) (Reader env a) (LiftReader env sig) | |
type DenotationM m ((:->) a sig) = m a -> DenotationM m sig | |
type DenResult ((:->) a sig) = DenResult sig | |
type LowerReader ((:->) a sig) = (:->) (UnReader a) (LowerReader sig) | |
type Denotation ((:->) a sig) = a -> Denotation sig |
Witness of the arity of a symbol signature
Valid symbols to use in an AST
type family SmartFun sym sig Source
Maps a symbol signature to the type of the corresponding smart constructor:
SmartFun sym (a :-> b :-> ... :-> Full x) = ASTF sym a -> ASTF sym b -> ... -> ASTF sym x
Maps a smart constructor type to the corresponding symbol signature:
SmartSig (ASTF sym a -> ASTF sym b -> ... -> ASTF sym x) = a :-> b :-> ... :-> Full x
smartSym' :: forall sig f sym. (Signature sig, f ~ SmartFun sym sig, sig ~ SmartSig f, sym ~ SmartSym f) => sym sig -> f Source
Make a smart constructor of a symbol. smartSym
has any type of the form:
smartSym :: sym (a :-> b :-> ... :-> Full x) -> (ASTF sym a -> ASTF sym b -> ... -> ASTF sym x)
Open symbol domains
data (sym1 :+: sym2) sig where infixr 9 Source
Direct sum of two symbol domains
(:<:) sym1 sym3 => sym1 :<: ((:+:) sym2 sym3) | |
sym1 :<: ((:+:) sym1 sym2) | |
Project sym1 sym3 => Project sym1 ((:+:) sym2 sym3) | |
Project sym1 ((:+:) sym1 sym2) | |
(Functor sym1, Functor sym2) => Functor ((:+:) sym1 sym2) | |
(Foldable sym1, Foldable sym2) => Foldable ((:+:) sym1 sym2) | |
(Traversable sym1, Traversable sym2) => Traversable ((:+:) sym1 sym2) | |
(Symbol sym1, Symbol sym2) => Symbol ((:+:) sym1 sym2) | |
(StringTree sym1, StringTree sym2) => StringTree ((:+:) sym1 sym2) | |
(Render sym1, Render sym2) => Render ((:+:) sym1 sym2) | |
(Equality sym1, Equality sym2) => Equality ((:+:) sym1 sym2) | |
(Eval s, Eval t) => Eval ((:+:) s t) | |
(BindingDomain sym1, BindingDomain sym2) => BindingDomain ((:+:) sym1 sym2) | |
(EvalEnv sym1 env, EvalEnv sym2 env) => EvalEnv ((:+:) sym1 sym2) env | |
(Equality sym1, Equality sym2) => Eq ((:+:) sym1 sym2 a) |
smartSym :: (Signature sig, f ~ SmartFun sup sig, sig ~ SmartSig f, sup ~ SmartSym f, sub :<: sup) => sub sig -> f Source
Make a smart constructor of a symbol. smartSym
has any type of the form:
smartSym :: (sub :<: AST sup) => sub (a :-> b :-> ... :-> Full x) -> (ASTF sup a -> ASTF sup b -> ... -> ASTF sup x)
Empty symbol type
Can be used to make uninhabited AST
types. It can also be used as a terminator in co-product
lists (e.g. to avoid overlapping instances):
(A :+: B :+: Empty)