zwischenstopp

lib/ast/basic_expressions.rb

@@ -28,11 +28,9 @@ module Ast
   class NameExpression < Expression
 #    attr_reader  :name
 
-    # compiling a variable resolves it. if it wasn't defined, raise an exception 
+    # compiling a variable resolves it. If it's not defined look call it as a menthod (which may raise NoMethodFound) 
     def compile frame
-      # either a variable or needs to be called.
       frame.get(name)
-#      frame.send name
     end
   end
 

lib/virtual/frame.rb

@@ -10,11 +10,17 @@ module Virtual
   # - next exception instruction
   # - self (me)
   # - argument mappings
-  # - local variable mapping
+  # - local variable mapping, together with last called binding
   class Frame
-    def initialize
+    def initialize normal , exceptional , me
-      
+      @next_normal = normal
+      @next_exception = exceptional
+      @me = me
+      # a binding represents the local variables at a point in the program.
+      # The amount of local variables is assumed to be relatively small, and so the 
+      # storage is a linked list. Has the same api as a ha
+      @binding = List.new
     end
-    attr_reader :next_normal, :next_exception, :me, :argument_names
+    attr_reader :next_normal, :next_exception, :me, :binding
   end
 end

lib/virtual/machine.rb

@@ -37,12 +37,10 @@ module Virtual
     end
 
     def initialize
-      # a binding represents the local variables at a point in the program.
+      the_end = HaltInstruction.new
-      # The amount of local variables is assumed to be relatively small, and so the 
+      @frame = Frame.new(the_end , the_end , :Object)
-      # storage is a linked list. Has the same api as a ha
-      @bindings = List.new
     end
-    attr_reader :bindings
+    attr_reader :frame
 
     # run the instruction stream given. Instructions are a graph and executing means traversing it.
     # If there is no next instruction the machine stops
@@ -53,6 +51,10 @@ module Virtual
         instruction = next_instruction
       end
     end
+    #return an anonymous new function (the top level) into which code is compiled
+    def anonymous
+      
+    end
   end
 end
 

lib/virtual/mystery.rb

@@ -9,10 +9,12 @@ module Virtual
 
   end
 
-  class TrueValue < Value
+  class Singleton < Value
   end
-  class FalseValue < Value
+  class TrueValue < Singleton
   end
-  class NilValue < Value
+  class FalseValue < Singleton
+  end
+  class NilValue < Singleton
   end
 end

test/virtual/test_basic.rb

@@ -32,19 +32,6 @@ class TestBasic < MiniTest::Test
     check
   end
 
-  def test_name_underscode_start
-    @string_input    = '_bar '
-    @output = Ast::NameExpression.new('_bar')
-    check
-  end
-
-  def test_name_underscode_middle
-    @string_input    = 'foo_bar '
-    @parse_output = {:name => 'foo_bar'}
-    @output = Ast::NameExpression.new('foo_bar')
-    check
-  end
-
   def test_instance_variable
     @string_input    = '@foo_bar '
     @parse_output = {:instance_variable=>{:name=>"foo_bar"}}
@@ -74,13 +61,4 @@ class TestBasic < MiniTest::Test
     check
   end
 
-  def test_string_escapes
-    out = 'hello  \nyou'
-    @string_input    = '"' + out + '"'
-    @parse_output =  {:string=>[{:char=>"h"}, {:char=>"e"}, {:char=>"l"}, {:char=>"l"}, {:char=>"o"}, 
-      {:char=>" "}, {:char=>" "}, {:esc=>"n"}, {:char=>"y"}, {:char=>"o"}, {:char=>"u"}]}
-    @output =  Ast::StringExpression.new(out)
-    check
-  end
-
 end

test/virtual/virtual_helper.rb

@@ -12,7 +12,7 @@ module VirtualHelper
     syntax  = parser.parse_with_debug(@string_input)
     parts   = Parser::Transform.new.apply(syntax)
     machine = Virtual::Machine.new
-    expressions = parts.compile(machine.bindings)
+    expressions = parts.compile(machine.frame , machine.anonymous)
     assert_equal @output , expressions
   end