Try and implement basic linguistic stuff for english

Mainate.cabal

@@ -19,6 +19,8 @@ extra-source-files:  CHANGELOG.md
 
 library
   exposed-modules:   Graph
+                   , Lang.En.Grapheme
+                   , Lang.En.Morpheme
                    , Stream
                    , Transducer
                    , Tree

src/Lang/En/Grapheme.hs

@@ -0,0 +1,100 @@
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE FlexibleInstances #-}
+module Lang.En.Grapheme (
+      Grapheme(..)
+    , Output(..)
+    , Regular(..)
+    , graphemes
+    , parse
+  ) where
+
+import Data.Char (toLower, isLower)
+import Data.List (groupBy)
+import qualified Data.Map as Map (empty, insert, lookup)
+import Data.String (IsString(..))
+--import Graph (Graph(..))
+import Stream (Stream)
+import Transducer (Transducer(..), fromList, run)
+--import Transducer (Transducer(..), RunState(..), Stack(..), fromList)
+
+data Regular =
+    A
+  | Ae
+  | Ai
+  | Ay
+  | E
+  | Ea
+  | Ee
+  | Ei
+  | B
+  | C
+  | Ck
+  | D
+  | F
+  | G
+  | Gh
+  | L
+  | P
+  | S
+  | T
+  | Th
+  | W
+  | Wh
+  deriving (Bounded, Enum, Eq, Ord, Read, Show)
+
+{-
+card :: Int
+card = fromEnum (maxBound :: Regular)
+-}
+
+data Grapheme = Grapheme Regular | Punctuation String deriving (Eq, Ord, Show)
+
+instance Read Grapheme where
+  readsPrec _ next =
+      [(maybe (Punctuation next) Grapheme $ Map.lookup next stringToGrapheme, "")]
+    where
+      stringToGrapheme = foldr insert Map.empty [minBound .. maxBound]
+      insert regular = Map.insert (show regular) regular
+      
+
+instance {-# OVERLAPS #-} IsString [Grapheme] where
+  fromString = fmap read . groupBy (const isLower)
+
+data Output = Output {
+      rawText :: String
+    , grapheme :: Grapheme
+  } deriving (Eq, Show)
+
+{-
+instance Enum Grapheme where
+  fromEnum (Regular r) = fromEnum r
+  fromEnum (Noise c) = card + fromEnum c
+
+  toEnum n
+    | n < card = Regular $ toEnum n
+    | otherwise = Noise $ toEnum (n - card)
+-}
+
+auto :: Regular -> ([Char], Either [Char] Grapheme)
+auto r = (toLower <$> show r, Right (Grapheme r))
+
+punctuation :: String -> ([Char], Either [Char] Grapheme)
+punctuation signs = (signs, Right (Punctuation signs))
+
+{-
+groupSpaces :: RunState Char Char Grapheme -> Maybe (RunState Char Char Grapheme)
+groupSpaces state@(RunState {transducer, stack = Stack (' ':ls)})
+  | focus (graph transducer) == 0 = Just $ state {stack = Stack ls}
+groupSpaces _ = Nothing
+-}
+
+graphemes :: Transducer Char Char Grapheme
+graphemes = (fromList $ punctuations ++ regulars) {
+    projector = toLower
+  }
+  where
+    regulars = auto <$> [minBound .. maxBound]
+    punctuations = punctuation <$> ["?", "!", ".", ",", ":", " "]
+
+parse :: Stream Char -> Stream Output
+parse = fmap (uncurry Output) . run graphemes

src/Lang/En/Morpheme.hs

@@ -0,0 +1,53 @@
+{-# LANGUAGE NamedFieldPuns #-}
+module Lang.En.Morpheme (
+      Morpheme(..)
+    , Output(..)
+    , morphemes
+    , parse
+  ) where
+
+import Data.String (fromString)
+import Lang.En.Grapheme (Grapheme(..))
+import qualified Lang.En.Grapheme as Grapheme (Output(..))
+import Stream (Stream)
+import Transducer (Transducer(..), fromList, run)
+
+data Regular =
+    LY
+  | ED
+  | UN
+  | CAT
+  | DOG
+  | EaT
+  | SLEeP
+  | A
+  | ThE
+  | GOoD
+  | KINd
+  | ANd
+  | Space
+  deriving (Bounded, Enum, Eq, Ord, Show)
+
+data Morpheme = Morpheme Regular | Punctuation String deriving (Eq, Ord, Show)
+
+auto :: Morpheme -> ([Grapheme], Either [Grapheme] Morpheme)
+auto morpheme = (fromString $ show morpheme, Right morpheme)
+
+morphemes :: Transducer Grapheme.Output Grapheme Morpheme
+morphemes = (fromList $ auto <$> [minBound .. maxBound]) {
+      projector = Grapheme.grapheme
+    , rules = []
+  }
+
+data Output = Output {
+      rawText :: String
+    , morpheme :: Morpheme
+  } deriving (Eq, Show)
+
+parse :: Stream Grapheme.Output -> Stream Output
+parse = fmap fusionGraphemes . run morphemes
+  where
+    fusionGraphemes (graphemes, morpheme) = Output {
+          rawText = concat $ Grapheme.rawText <$> graphemes
+        , morpheme
+      }

src/Transducer.hs

@@ -1,34 +1,35 @@
 {-# LANGUAGE NamedFieldPuns #-}
 module Transducer (
-      Transducer
+      RunState(..)
+    , Stack(..)
+    , Transducer(..)
     , fromList
     , run
   ) where
 
+import Data.List (find)
 import Data.Map ((!), insert)
+import Data.Maybe (isJust)
 import Graph (Graph(..), Vertex(..), editVertex, follow, rewind, singleton, weave)
 import Stream (Stream(..), merge)
 import qualified Stream (empty)
 
-type Transducer input output = Graph input [output]
-newtype Stack a = Stack [a]
+data Transducer input label output = Transducer {
+      graph :: Graph label [output]
+    , rules :: [RunState input label output -> Maybe (RunState input label output)]
+    , projector :: input -> label
+  }
 
-push :: a -> Stack a -> Stack a
-push a (Stack s) = Stack (a:s)
-
-content :: Stack a -> [a]
-content (Stack s) = reverse s
-
-empty :: Transducer input output
+empty :: Graph edge [label]
 empty = singleton []
 
-entry :: Ord input => Transducer input output -> ([input], output) -> Transducer input output
+entry :: Ord edge => Graph edge [label] -> ([edge], label) -> Graph edge [label]
 entry transducer (path, output) =
   rewind $ editVertex (weave transducer path) pushLabel
   where
     pushLabel vertex = vertex {label = output:(label vertex)}
 
-loop :: Ord input => Transducer input output -> ([input], [input]) -> Transducer input output
+loop :: Ord edge => Graph edge [label] -> ([edge], [edge]) -> Graph edge [label]
 loop transducer ([], loopPath) =
   case splitAt (length loopPath - 1) loopPath of
     (_, []) -> transducer
@@ -41,23 +42,53 @@ loop transducer ([], loopPath) =
       vertex {edges = insert input (focus transducer) $ edges vertex}
 loop transducer (prefix, loopPath) = loop (weave transducer prefix) ([], loopPath)
 
-fromList :: Ord input => [([input], Either [input] output)] -> Transducer input output
-fromList = foldl add empty
+fromList :: Ord input => [([input], Either [input] output)] -> Transducer input input output
+fromList l = Transducer {graph = foldl add empty l, projector = id, rules = []}
   where
     add transducer (path, Left loopPath) = loop transducer (path, loopPath)
     add transducer (path, Right output) = entry transducer (path, output)
 
-run :: (Ord input, Eq output) => Transducer input output -> Stream input -> Stream ([input], output)
-run transducer = runWithStack initState
-  where
-    initState = (transducer, Stack [])
-    emit stack stream output = ((content stack, output), runWithStack initState stream)
-    runWithStack (state, stack) (Stream inputs) = foldl (\outputsStream (input, stream) ->
-        case follow state input of
+data RunState input label output = RunState {
+      transducer :: Transducer input label output
+    , stack :: Stack input
+  }
+
+initState :: Transducer input label output -> RunState input label output
+initState transducer = RunState {
+      transducer = transducer {graph = rewind $ graph transducer}
+    , stack = Stack []
+  }
+
+newtype Stack a = Stack [a]
+
+push :: a -> Stack a -> Stack a
+push a (Stack s) = Stack (a:s)
+
+content :: Stack a -> [a]
+content (Stack s) = reverse s
+
+tryInput :: (Eq input, Ord label, Eq output) => RunState input label output -> Stream ([input], output) -> (input, Stream input) -> Stream ([input], output)
+tryInput state@(RunState {transducer, stack}) outputsStream (input, stream) =
+  case follow (graph transducer) (projector transducer $ input) of
     Nothing -> Stream.empty
-          Just newState@(Graph {vertices, focus}) ->
+    Just newGraph@(Graph {vertices, focus}) ->
       let newStack = push input stack in
-            let emitted = Stream $ emit newStack stream <$> label (vertices ! focus) in
-            let continue = runWithStack (newState, newStack) stream in
+      let emitted = Stream $ emit newStack <$> label (vertices ! focus) in
+      let continue = runState (state {
+            transducer = transducer {graph = newGraph}
+          , stack = newStack
+        }) stream in
       emitted `merge` continue `merge` outputsStream
-      ) Stream.empty inputs
+  where
+    emit aStack output = (
+        (content aStack, output), runState (initState transducer) stream
+      )
+
+runState :: (Eq input, Ord label, Eq output) => RunState input label output -> Stream input -> Stream ([input], output)
+runState state@(RunState {transducer}) (Stream inputs) =
+  case find isJust $ ($ state) <$> rules transducer of
+    Just (Just newState) -> runState newState (Stream inputs)
+    _ -> foldl (tryInput state) Stream.empty inputs
+
+run :: (Eq input, Ord label, Eq output) => Transducer input label output -> Stream input -> Stream ([input], output)
+run transducer = runState $ initState transducer