implement attr setter correctly

part of #25
still need to do for list and attr_reader

lib/ruby/class_statement.rb

@@ -2,6 +2,8 @@ module Ruby
   class ClassStatement < Statement
     attr_reader :name, :super_class_name , :body
 
+    # init with the class name, super class name and statement body
+    # body must be Method or Send (See to_vool) or empty/nil (possibly not handled right)
     def initialize( name , supe , body)
       @name , @super_class_name = name , supe
       case body
@@ -16,21 +18,50 @@ module Ruby
       end
     end
 
+    # Create equivalent vool objects. Mostly for method statements
+    # For calls, call transform_statement, see there
     def to_vool
-      meths = body.statements.collect do |meth|
-        meth.is_a?(MethodStatement) ?  meth.to_vool : tranform_statement(meth)
+      meths = []
+      body.statements.each do |meth|
+        if( meth.is_a?(MethodStatement))
+          meths << meth.to_vool
+        else
+          meths += transform_statement(meth)
+        end
       end
       Vool::ClassStatement.new(@name , @super_class_name, Vool::Statements.new(meths) )
     end
 
-    def tranform_statement( class_send )
+    # We rewrite certain send statements (so raise error for all else)
+    # Currently only attributes (ie attr :name) supported, for which the standard getter
+    # and setter is created and returned as vool
+    def transform_statement( class_send )
       unless class_send.is_a?(SendStatement)
         raise "Other than methods, only class methods allowed, not #{class_send.class}"
       end
       unless class_send.name == :attr
         raise "Only remapping attr and cattr, not #{class_send.name}"
       end
-      raise "todo"
+      attr = class_send.arguments.first.value
+      [ getter_for(attr) , setter_for(attr) ]
+    end
+
+    # creates a getter method for the given instance name (sym)
+    # The Method is created in Ruby, and to_vool is called to transform to Vool
+    # The standard getter obviously only returns the ivar
+    def getter_for(instance_name)
+      return_statement = ReturnStatement.new(InstanceVariable.new(instance_name))
+      MethodStatement.new(instance_name , [] , return_statement).to_vool
+    end
+
+    # creates a setter method (name=) for the given instance name (sym)
+    # The Method is created in Ruby, and to_vool is called to transform to Vool
+    # The setter method assigns the incoming value and returns the ivar
+    def setter_for(instance_name)
+      assign = IvarAssignment.new(instance_name , LocalVariable.new(:val))
+      return_statement = ReturnStatement.new(InstanceVariable.new(instance_name))
+      statements = Statements.new([assign, return_statement])
+      MethodStatement.new("#{instance_name}=".to_sym , [:val] , statements).to_vool
     end
 
     def to_s(depth = 0)

test/ruby/test_class_statement.rb

@@ -81,19 +81,44 @@ module Ruby
       input = "class Tryout < Base;attr :page ;end"
       @vool = compile( input ).to_vool
     end
+    def getter
+      @vool.body.statements.first
+    end
+    def setter
+      @vool.body.statements.last
+    end
     def test_class
       assert_equal Vool::ClassStatement , @vool.class
     end
     def test_body
       assert_equal Vool::Statements , @vool.body.class
     end
-    def test_compile_class_name
-      assert_equal :Tryout , @vool.name
+    def test_getter
+      assert_equal Vool::MethodStatement , getter.class
     end
-    def test_compile_class_super
-      assert_equal :Base , @vool.super_class_name
+    def test_getter_return
+      assert_equal Vool::ReturnStatement , getter.body.class
+    end
+    def test_getter_name
+      assert_equal :page , getter.name
+    end
+    def test_setter
+      assert_equal Vool::MethodStatement , setter.class
+    end
+    def test_setter_assign
+      assert_equal Vool::Statements , setter.body.class
+      assert_equal Vool::IvarAssignment , setter.body.first.class
+    end
+    def test_setter_return
+      assert_equal Vool::Statements , setter.body.class
+      assert_equal Vool::ReturnStatement , setter.body.last.class
+    end
+    def test_setter_name
+      assert_equal :page= , setter.name
+    end
+    def test_setter_args
+      assert_equal [:val] , setter.args
     end
-
   end
 
 end