create DFA for Vi's 'l' motion

fcore/cursor-dfa/vi-l-dfa.sml

@@ -0,0 +1,37 @@
+structure ViLDfa =
+struct
+  val startState: Word8.word = 0w0
+  val notNewlineState: Word8.word = 0w1
+  val oneNewlineState: Word8.word = 0w2
+
+  fun makeStart i =
+    if Char.chr i = #"\n" then oneNewlineState else notNewlineState
+
+  fun makeOneNewline _ = notNewlineState
+
+  val startTable = Vector.tabulate (255, makeStart)
+  val notNewlineTable = startTable
+  val oneNewlineTable = Vector.tabulate (255, makeOneNewline)
+
+  val tables = #[startTable, notNewlineTable, oneNewlineTable]
+
+  structure ViL =
+    MakeNextDfaLoop
+      (struct
+         val startState = startState
+
+         structure Folder =
+           MakeCharFolderNext
+             (struct
+                val startState = startState
+                val tables = tables
+
+                fun finish x = x
+                fun isFinal currentState = currentState = notNewlineState
+              end)
+
+         val fStart = Folder.foldNext
+       end)
+
+  val next = ViL.next
+end