Generate equivalent source for ASTs from whitequarks awesome parser.

This library is in early development stage and still has some bugs/missing features. Nevertheless it is able to regenerate it own source and serves well for mutant mutators and the in-memory vendoring for self hosting mutant.

This library dropped the reproduction of 1.8 syntax in the 0.1.0 release.

require 'unparser'
Unparser.unparse(your_ast) # => "the code"

To preserve the comments from the source:

require 'parser/current'
require 'unparser'
ast, comments = Parser::CurrentRuby.parse_with_comments(your_source)
Unparser.unparse(ast, comments) # => "the code # with comments"

Equivalent vs identical:

require 'unparser'

code = <<-RUBY
%w(foo bar)
RUBY

node = Parser::CurrentRuby.parse(code)

generated = Unparser.unparse(node) # ["foo", "bar"], NOT %w(foo bar) !

code == generated                            # false, not identical code
Parser::CurrentRuby.parse(generated) == node # true, but identical AST

Summary: unparser does not reproduce your source! It produces equivalent source.

Install the gem unparser via your prefered method.

• Markus Schirp (mbj) Author
• Trent Ogren Adding comment reproduction

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with Rakefile or version (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
• Send me a pull request. Bonus points for topic branches.

See LICENSE file.