mrbgem.rake のパラメーターを parse する

sample.rb

#!/usr/bin/env ruby

class Foo
  def self.parse(src)
    instance_eval(src)
  end

  class MRuby
    class Gem
      class Specification
        attr_accessor :license, :author, :summary, :dependencies

        def initialize(name, &block)
          @dependencies = []
          block.call(self)
        end

        def add_dependency(name)
          @dependencies << name
        end
      end
    end
  end
end

p Foo.parse DATA.read
# Foo::MRuby::Gem::Specification
# #<Foo::MRuby::Gem::Specification:0x007fb2a11f71a0 @dependencies=["mruby-string-ext"], @license="MIT", @author="mruby developers", @summary="Random class">

__END__

MRuby::Gem::Specification.new('mruby-random') do |spec|
  spec.license = 'MIT'
  spec.author  = 'mruby developers'
  spec.summary = 'Random class'
  spec.add_dependency 'mruby-string-ext'
  spec.add_dependency 'mruby-pack'
end