mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-21 02:31:50 +03:00
73 lines
2.2 KiB
Idris
73 lines
2.2 KiB
Idris
import Language.Reflection
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%language ElabReflection
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%TTImpLit fromTTImp
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public export
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data NatExpr : Type where
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Plus : NatExpr -> NatExpr -> NatExpr
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Mult : NatExpr -> NatExpr -> NatExpr
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Val : Nat -> NatExpr
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Var : String -> NatExpr
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public export
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natExpr : TTImp -> Elab NatExpr
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natExpr `(~(l) + ~(r)) = [| Plus (natExpr l) (natExpr r) |]
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natExpr `(~(l) * ~(r)) = [| Mult (natExpr l) (natExpr r) |]
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natExpr `(fromInteger ~(IPrimVal _ (BI n))) = pure $ Val $ fromInteger n
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natExpr (IVar _ (UN (Basic nm))) = pure $ Var nm
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natExpr s = failAt (getFC s) "Invalid NatExpr"
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namespace AsMacro
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%macro
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fromTTImp : TTImp -> Elab NatExpr
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fromTTImp = natExpr
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export
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natExprMacroTest : NatExpr
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natExprMacroTest = `(1 + 2 + x)
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export
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natExprPrecedenceTest : NatExpr
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natExprPrecedenceTest = `(1 + 2 * 3 + 4)
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failing "Invalid NatExpr"
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natExprInvalid : NatExpr
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natExprInvalid = `(f x)
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namespace AsScript
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fromTTImp : TTImp -> Elab NatExpr
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fromTTImp = natExpr
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export
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natExprScriptTest : NatExpr
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natExprScriptTest = %runElab `(3 + 4)
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failing "Invalid NatExpr"
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natExprInvalid : NatExpr
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natExprInvalid = %runElab `(f x)
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namespace AsFunction
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public export
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data IsNatExpr : TTImp -> Type where
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IsPlus : IsNatExpr l -> IsNatExpr r -> IsNatExpr (IApp fc1 (IApp fc2 (IVar fc3 (UN (Basic "+"))) l) r)
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IsMult : IsNatExpr l -> IsNatExpr r -> IsNatExpr (IApp fc1 (IApp fc2 (IVar fc3 (UN (Basic "*"))) l) r)
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IsVal : (n : Integer) -> IsNatExpr (IApp fc1 (IVar fc2 (UN (Basic "fromInteger"))) (IPrimVal fc3 (BI n)))
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export
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fromTTImp : (0 s : TTImp) ->
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IsNatExpr s =>
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NatExpr
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fromTTImp (IApp _ (IApp _ (IVar _ (UN (Basic "+"))) l) r) @{IsPlus _ _} = Plus (fromTTImp l) (fromTTImp r)
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fromTTImp (IApp _ (IApp _ (IVar _ (UN (Basic "*"))) l) r) @{IsMult _ _} = Mult (fromTTImp l) (fromTTImp r)
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fromTTImp (IApp _ (IVar _ (UN (Basic "fromInteger"))) (IPrimVal _ (BI n))) @{IsVal n} = Val $ cast n
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export
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natExprFunctionTest : NatExpr
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natExprFunctionTest = `(1 + 2 * 3 + 4)
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failing "Can't find an implementation for IsNatExpr"
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natExprInvalid : NatExpr
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natExprInvalid = `(f x)
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