🕷 software releases

by ryan davis


ParseTree version 2.0.1 has been released!

Published 2007-08-21 @ 00:28

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
    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 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).


  • 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.
  • https://www.zenspider.com/ZSS/Products/ParseTree/