update reader and implement singletons

Gemfile.lock

@@ -7,7 +7,7 @@ GIT
 
 GIT
   remote: https://github.com/ruby-in-ruby/crystal-reader.git
-  revision: 3a56ae1a8d96845bbb80f760626c8203d57cb1c3
+  revision: bc8697c733113b19863df632b546c7eab2b429c0
   specs:
     crystal-reader (0.1.0)
 

lib/ast/basic_expressions.rb

@@ -9,6 +9,22 @@ module Ast
     end
   end
 
+  class TrueExpression
+    def compile frame
+      Virtual::TrueValue.new
+    end
+  end
+  class FalseExpression
+    def compile frame
+      Virtual::FalseValue.new
+    end
+  end
+  class NilExpression
+    def compile frame
+      Virtual::NilValue.new
+    end
+  end
+
   class NameExpression < Expression
 #    attr_reader  :name
 

lib/virtual/constants.rb

@@ -1,7 +1,6 @@
 module Virtual
   
   class Constant < ::Virtual::Object
-    
   end
 
   # another abstract "marker" class (so we can check for it)

lib/virtual/mystery.rb

@@ -1,6 +1,6 @@
 module Virtual
   class Mystery < Value
-    def initilize 
+    def initialize 
     end
 
     def as type
@@ -8,4 +8,11 @@ module Virtual
     end
 
   end
+
+  class TrueValue < Value
+  end
+  class FalseValue < Value
+  end
+  class NilValue < Value
+  end
 end

lib/virtual/value.rb

@@ -6,6 +6,12 @@ module Virtual
   # Integer and (Object) References are the main derived classes, but float will come and ...
   # The Mystery Value has unknown type and has only casting methods. So it must be cast to be useful.
   class Value
+    def == other
+      other.class == self.class
+    end
+    def inspect
+      self.class.name + ".new()"
+    end
     def type
       self.class
     end

test/test_all.rb

@@ -1,2 +1 @@
 require_relative "fragments/test_all"
-require_relative "test_intel"

test/virtual/test_basic.rb

@@ -10,6 +10,22 @@ class TestBasic < MiniTest::Test
     check
   end
 
+  def test_true
+    @string_input    = 'true '
+    @output = [Virtual::TrueValue.new()]
+    check
+  end
+  def test_false
+    @string_input    = 'false '
+    @output = [Virtual::FalseValue.new()]
+    check
+  end
+  def test_nil
+    @string_input    = 'nil '
+    @output = [Virtual::NilValue.new()]
+    check
+  end
+
   def test_name
     @string_input    = 'foo '
     @output = [nil]