Using asm from jruby

I'm a novice asm user, and I've been using jruby for a long time.  When I
started using asm, it seemed like there might be some things that would be
simpler in jruby than in Java.

If you haven't played with asm + jruby, take a look.  You can do some
interesting things with not much code.	For example, here's the jruby to visit
a set of class files (given on the command line), printing out every call to
visit*:

(You'll need to specify a -I option to tell jruby where to find the asm-3.3.1
jar - in my case: jruby -I /Users/james/experimements/AsmSample/libs
SomeFile.class)

require 'java'
require 'asm-3.3.1'

# This lets me type org.objectweb.asm::... instead of
Java::OrgObjectwebAsm::...
def org
  Java::Org
end

class SampleVisitor
  include org.objectweb.asm::MethodVisitor
  include org.objectweb.asm::ClassVisitor
  include org.objectweb.asm::FieldVisitor
  include org.objectweb.asm::AnnotationVisitor
  include org.objectweb.asm.signature::SignatureVisitor

  def method_missing name, *args
    name_string = name.to_s
    if name_string =~ /visit.*/
      puts "#{name}\t#{args}"
      self
    else
      super
    end
  end
end

# Loop through each .class file given on the command line
ARGV.each do |classfile|
  puts " ---------------- Reading file #{classfile}"
  f = java.io.File.new classfile
  fis = java.io.FileInputStream.new f
  
  class_reader = org.objectweb.asm::ClassReader.new fis
  
  v = SampleVisitor.new
  
  class_reader.accept v, 0
  
  puts
end

-- 
James Moore
[email protected]
http://blog.restphone.com/

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