get the tests to work

lib/asm/block.rb

@@ -2,11 +2,10 @@ require_relative 'call_instruction'
 require_relative 'stack_instruction'
 require_relative 'logic_instruction'
 require_relative 'memory_instruction'
+require_relative "code"
 
 module Asm
-  
+    
-  class Code ; end
-  
   # A Block is the smalles unit of code, a list of instructions as it were
   # It is also a point to jump/branch to. An address in the final stream.
   # To allow for forward branches creation does not fix the position. 

lib/asm/code.rb

@@ -0,0 +1,45 @@
+module Asm
+  # Base class for anything that we can assemble
+
+  # Derived classes include instructions and data(strings)
+  
+  # The commonality abstracted here is the length and position
+  # and the ability to assemble itself into the stream
+  
+  # All code is position independant once assembled.
+  # But for jumps and calls two passes are neccessary. 
+  # The first setting the position, the second assembling
+  class Code
+    
+    # just sets position to nil, so we can sell that it has not been set
+    def initialize
+      @position = nil
+    end
+
+    # the position in the stream. Think of it as an address if you want. The difference is small.
+    # Especially since we produce _only_ position independant code
+    # in other words, during assembly the position _must_ be resolved into a pc relative address
+    # and not used as is
+    def position
+      throw "Not set" unless @address
+      @address 
+    end
+    
+    # The containing class (assembler/function) call this to tell the instruction/data where it is in the
+    # stream. During assembly the position is then used to calculate pc relative addresses.
+    def at address
+      @address = address
+    end
+    
+    # length for this code in bytes
+    def length
+      throw "Not implemented #{self}"
+    end
+    
+    # so currently the interface passes the io (usually string_io) in for the code to assemble itself.
+    # this may change as the writing is still done externally (or that will change)
+    def assemble(io)
+      throw "Not implemented #{self}"
+    end
+  end
+end

test/test_all.rb

@@ -1,4 +1,4 @@
 require_relative "test_crystal"
 require_relative "test_small_program"
-require_relative "test_runner"
+#require_relative "test_runner"
 require_relative "parser/test_all"