Experiment: Add #ifdef preprocessor for conditional XDR codegen (Go)

lib/xdrgen.rb

@@ -10,6 +10,7 @@ module Xdrgen
   autoload :CLI
   autoload :Generators
   autoload :Parser
+  autoload :Preprocessor
   autoload :Util
 
   autoload :Output

lib/xdrgen/ast/definitions/base.rb

@@ -1,9 +1,14 @@
 module Xdrgen::AST::Definitions
   class Base < Treetop::Runtime::SyntaxNode
+    attr_writer :ifdefs
+
+    def ifdefs
+      @ifdefs || []
+    end
 
     def sub_type
       :simple
     end
-    
+
   end
 end

lib/xdrgen/compilation.rb

@@ -12,13 +12,23 @@ def initialize(source_paths, output_dir:".", language: :ruby, generator: nil, na
       @options     = options
     end
 
+    memoize def raw_source
+     @source_paths.map{|p| IO.read(p, encoding: "UTF-8")}.join("\n")
+    end
+
+    memoize def preprocessor
+      Preprocessor.new(raw_source)
+    end
+
     memoize def source
-     @source_paths.map{|p| IO.read(p)}.join("\n")
+      preprocessor.cleaned_source
     end
 
     memoize def ast
       parser = Parser.new
-      parser.parse(source)
+      result = parser.parse(source)
+      preprocessor.annotate_ast(result)
+      result
     end
 
     def compile