[ANN] ruby_parser 3.10.0 Released

ruby-talk
1

I have been using Whitequark's Parser and Unparser to transform Ruby code.
I find the AST much easier to work with.. What sets this and ruby2ruby
apart?

···

On Tue, Jul 18, 2017 at 1:00 AM, Ryan Davis <ryand-ruby@zenspider.com> wrote:

ruby_parser version 3.10.0 has been released!

* home: <https://github.com/seattlerb/ruby_parser&gt;
* bugs: <https://github.com/seattlerb/ruby_parser/issues&gt;
* rdoc: <http://docs.seattlerb.org/ruby_parser&gt;

ruby_parser (RP) is a ruby parser written in pure ruby (utilizing
racc--which does by default use a C extension). RP's output is
the same as ParseTree's output: s-expressions using ruby's arrays and
base types.

As an example:

    def conditional1 arg1
      return 1 if arg1 == 0
      return 0
    end

becomes:

    s(:defn, :conditional1, s(:args, :arg1),
      s(:if,
        s(:call, s(:lvar, :arg1), :==, s(:lit, 0)),
        s(:return, s(:lit, 1)),
        nil),
      s(:return, s(:lit, 0)))

Tested against 801,039 files from the latest of all rubygems (as of
2013-05):

* 1.8 parser is at 99.9739% accuracy, 3.651 sigma
* 1.9 parser is at 99.9940% accuracy, 4.013 sigma
* 2.0 parser is at 99.9939% accuracy, 4.008 sigma

Changes:

### 3.10.0 / 2017-07-17

* 4 minor enhancements:

  * Added support for 'squiggly heredocs' (indented content). (jjoos)
  * Bumped oedipus_lex to ~> 2.5.
  * Bumped sexp_processor to ~> 4.9.
  * Made STRICT_SEXP=1 safe: converted indexed sexps to semantic calls
where needed.

* 5 bug fixes:

  * Clear and restore cmdarg stack around defs args and body.
(presidentbeef)
  * Conditionalize use of sexp_body= to make it compatible w/
sexp_processor 4.9.0
  * Fix up line numbers in strings with newlines and `#`. (presidentbeef)
  * Fixed line numbers of resbodies.
  * Fixed some tracking of lexical state. Fixes bug #249.

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--
- Simen