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57 lines
1.3 KiB
Haskell
57 lines
1.3 KiB
Haskell
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{-# LANGUAGE ScopedTypeVariables #-}
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module Generators
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( literal
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, name
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, variable
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, boolean
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, lambda
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, apply
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, ifthenelse
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) where
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import Prelude hiding (span)
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import Hedgehog hiding (Var)
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import qualified Hedgehog.Gen as Gen
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import qualified Hedgehog.Range as Range
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import Data.Core
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import Data.Name
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-- The 'prune' call here ensures that we don't spend all our time just generating
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-- fresh names for variables, since the length of variable names is not an
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-- interesting property as they parse regardless.
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name :: MonadGen m => m Name
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name = Gen.prune (User <$> names) where
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names = Gen.string (Range.linear 1 10) Gen.lower
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boolean :: MonadGen m => m Core
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boolean = Bool <$> Gen.bool
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variable :: MonadGen m => m Core
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variable = Var <$> name
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ifthenelse :: MonadGen m => m Core -> m Core
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ifthenelse bod = Gen.subterm3 boolean bod bod If
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apply :: MonadGen m => m Core -> m Core
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apply gen = go where
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go = Gen.recursive
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Gen.choice
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[ Gen.subterm2 gen gen (:$)]
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[ Gen.subterm2 go go (:$) -- balanced
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, Gen.subtermM go (\x -> Lam <$> name <*> pure x)
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]
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lambda :: MonadGen m => m Core -> m Core
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lambda bod = do
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arg <- name
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Gen.subterm bod (Lam arg)
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atoms :: MonadGen m => [m Core]
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atoms = [boolean, variable, pure Unit, pure Frame]
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literal :: MonadGen m => m Core
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literal = Gen.recursive Gen.choice atoms [lambda literal]
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