ParseTree 1.4.1 Released

ParseTree version 1.4.1 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 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

  • Only works on methods in classes/modules, not arbitrary code.

  • Does not work on the core classes, as they are not ruby (yet).


  • 4 minor enhancements:

    • parse_tree_show -f output is much cleaner now.
    • ParseTree does a much more elegant job of handling different
    • ParseTree now has all node names in ParseTree::NODE_NAMES.
    • ParseTree now raises exceptions instead of freakin’.
  • 3 bug fixes:

    • Used multiruby to test against 1.8.2-4, 1.8 cvs, and 1.9 cvs.
    • Fixed incompatibilites introduced in ruby 1.8.4.
    • Fixed some incompatibilites introduced in ruby 1.9.x.

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs