ParseTree 2.0.2 Released

ParseTree version 2.0.2 has been released!

ParseTree is a C extension (using RubyInline) that extracts the parse
tree for an entire class or a specific method and returns it as a
s-expression (aka sexp) using ruby’s arrays, strings, symbols, and

As an example:

def conditional1(arg1)
if arg1 == 0 then
return 1
return 0


[:args, :arg1],
[:call, [:lvar, :arg1], :==, [:array, [:lit, 0]]],
[:return, [:lit, 1]],
[:return, [:lit, 0]]]]]

  • Uses RubyInline, so it just drops in.
  • Includes SexpProcessor and CompositeSexpProcessor.
    • Allows you to write very clean filters.
  • Includes UnifiedRuby, allowing you to automatically rewrite ruby
  • ParseTree#parse_tree_for_string lets you parse arbitrary strings of
  • Includes parse_tree_show, which lets you quickly snoop code.
    • echo “1+1” | parse_tree_show -f for quick snippet output.
  • Includes parse_tree_abc, which lets you get abc metrics on code.
    • abc metrics = numbers of assignments, branches, and calls.
    • whitespace independent metric for method complexity.
  • Includes parse_tree_deps, which shows you basic class level
  • Does not work on the core classes, as they are not ruby (yet).


  • 2 minor enhancements:

    • Deactivated gcc-specific compiler flags unless ENV[‘ANAL’] or on
      my domain.
    • Minor code cleanup - happier with -pedantic and the like.
  • 1 bug fix:

    • FINALLY conquered the splat args bug on certain platforms/versions.
      Special Thanks to Jonas P. for debugging this and providing
      a patch.