enable steep strict for oracle.rb

Author: rickhull

Steepfile

@@ -10,6 +10,8 @@ target :lib do
   check "lib/compsci/elo.rb"
   check "lib/compsci/fibonacci.rb"
   check "lib/compsci/fit.rb"
+  # ...
+  check "lib/compsci/oracle.rb"
 
   # library "pathname"              # Standard libraries
   # library "strong_json"           # Gems

lib/compsci/oracle.rb

@@ -64,14 +64,14 @@ def percentage
 
       def prediction
         highest = -1
-        best = nil
+        best = ''
         @freq[@ring.to_s]&.each { |val, count|
           if count > highest
             best = val
             highest = count
           end
         }
-        best
+        best.empty? ? nil : best
       end
 
       def update(char)

sig/oracle.rbs

@@ -0,0 +1,36 @@
+module CompSci
+  module Oracle
+    class Ring
+      @limit: Integer
+      @cursor: Integer
+      @storage: Array[untyped]
+
+      attr_reader limit: Integer
+      attr_reader cursor: Integer
+      attr_reader storage: Array[untyped]
+
+      def initialize: (?Integer limit) -> void
+      def update: (untyped val) -> self
+      def to_s: () -> String
+      def full?: () -> bool
+    end
+
+    class Model
+      @ring: Ring
+      @freq: Hash[String, Hash[String, Integer]]
+      @pred: Hash[Symbol, Integer]
+
+      attr_reader ring: Ring
+      attr_reader freq: Hash[String, Hash[String, Integer]]
+      attr_reader pred: Hash[Symbol, Integer]
+
+      def initialize: (?Integer limit) -> void
+      def to_s: () -> String
+      def ratio: () -> Rational
+      def percentage: () -> Float
+      def prediction: () -> String?
+      def update: (String char) -> self
+      def accept: (String str) -> self
+    end
+  end
+end