ParseTree version 2.0.1 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
integers.

As an example:

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

becomes:

[:defn,
:conditional1,
[:scope,
[:block,
[:args, :arg1],
[:if,
[:call, [:lvar, :arg1], :==, [:array, [:lit, 0]]],
[:return, [:lit, 1]],
nil],
[: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 quirks.
* ParseTree#parse_tree_for_string lets you parse arbitrary strings of ruby.
* 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 dependencies.
* Does not work on the core classes, as they are not ruby (yet).

Changes:

* 1 major enhancement:

* Rewrote parse_tree_show to use parse_tree_for_string.
* parse_tree_show adds -n=node filtering -u unifying, and -s structure-only.
* parse_tree_show no longer needs -f

* 4 minor enhancements:

* Added context stack to SexpProcessor! YAY!!!
* Enforce type to be symbol in SexpProcessor... just makes life easier.
* Processing style change mode to UnifiedRuby. Prefer no rescues.
* Sexp#structure is no longer destructive.

* 4 bug fixes:

* Added 1.8.4 compatibility fix.
* Added args lifting in :defs in UnifiedRuby.
* Fixed unifying argscat, splat, and a couple other oddities.
* Added process_call to UnifiedRuby *sigh* I'm a tard.