feat(xanthous): Add a generator for random english syllables r/2656

Add a new "speech" generator module, with the beginnings of the vague
definition of the phonotactics of the language (there's one in here for
English based on the wikipedia article for English phonology, but it's
less than ideal as it has generated words like "sprurlkt") and the
ability to generate random syllables of a language by picking an onset,
nucleus, and coda from the list for that language (within a range of the
number of allowed of each syllable part). This will be used down the
road to automatically generate utterances from various
non-english-speaking creatures (so the accuracy is less important, just
that it "feels real").

Change-Id: I7b81375ec595239c05c5c800cbde1a2a900e38ac
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3202
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

1 files changed, 23 insertions, 1 deletions

diff --git a/users/grfn/xanthous/src/Xanthous/Orphans.hs b/users/grfn/xanthous/src/Xanthous/Orphans.hs
index 1fe9708edb..2a9a7a7ebc 100644
--- a/users/grfn/xanthous/src/Xanthous/Orphans.hs
+++ b/users/grfn/xanthous/src/Xanthous/Orphans.hs
@@ -1,10 +1,10 @@
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE UndecidableInstances #-}
-{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE PackageImports #-}
 {-# OPTIONS_GHC -Wno-orphans #-}
 --------------------------------------------------------------------------------
+{-# OPTIONS_GHC -Wno-deferred-type-errors #-}
 module Xanthous.Orphans
   ( ppTemplate
   ) where
@@ -31,6 +31,8 @@ import           Linear
 --------------------------------------------------------------------------------
 import           Xanthous.Util.JSON
 import           Xanthous.Util.QuickCheck
+import qualified Data.Interval as Interval
+import Data.Interval (Interval, Extended (..))
 --------------------------------------------------------------------------------
 
 instance forall s a.
@@ -350,3 +352,23 @@ deriving newtype instance (Arbitrary s, CoArbitrary (m (a, s)))
 deriving via (GenericArbitrary (V2 a)) instance Arbitrary a => Arbitrary (V2 a)
 instance CoArbitrary a => CoArbitrary (V2 a)
 instance Function a => Function (V2 a)
+
+--------------------------------------------------------------------------------
+
+instance Arbitrary r => Arbitrary (Extended r) where
+  arbitrary = oneof [ pure NegInf
+                    , pure PosInf
+                    , Finite <$> arbitrary
+                    ]
+
+instance Arbitrary Interval.Boundary where
+  arbitrary = elements [ Interval.Open , Interval.Closed ]
+
+instance (Ord r, Arbitrary r) => Arbitrary (Interval r) where
+  arbitrary = do
+    lower <- arbitrary
+    upper <- arbitrary
+    pure $ (if upper < lower then flip else id)
+      Interval.interval
+      lower
+      upper