insns2vm.rb: make #generate_parser private

which is only used by #router.

To make it private, we need to stop defining them on top-level.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62065 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/insns2vm.rb

@@ -6,7 +6,7 @@
 require_relative 'ruby_vm/scripts/insns2vm'
 
 if $0 == __FILE__
-  router(ARGV).each do |(path, generator)|
+  RubyVM::Insns2VM.router(ARGV).each do |(path, generator)|
     str = generator.generate path
     path.open 'wb:utf-8' do |fp|
       fp.write str

tool/ruby_vm/scripts/insns2vm.rb

@@ -13,7 +13,8 @@
 require 'optparse'
 require_relative '../controllers/application_controller.rb'
 
-def router argv
+module RubyVM::Insns2VM
+  def self.router argv
     options = { destdir: Dir.getwd }
     targets = generate_parser(options).parse argv
     return targets.map do |i|
@@ -21,7 +22,7 @@ def router argv
     end
   end
 
-def generate_parser(options)
+  def self.generate_parser(options)
     OptionParser.new do |this|
       this.on "-I", "--srcdir=DIR", <<-'end'
         Historically this option has been passed to the script.  This is
@@ -88,3 +89,5 @@ def generate_parser(options)
       end
     end
   end
+  private_class_method :generate_parser
+end