BYACC/R (Berkeley Yacc for Ruby)                        
                                                                               
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Usage

byaccr -R [-c class_name] [-f file_name] [-s ruby_semantic_type]
          [-i include_name] [-x extend_name] yacc_file

file_name:  specify the output file which named file_name.rb.
class_name: specify the parser class (the default is 'Parser').
ruby_semantic_type: @yylval instantiated from 'ruby_semantic_type'.
include_name: specify the class which is included in the parser class.
extend_name: specify the super class of the parser class.
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Links

  * BYACC/J (Berkeley Yacc/Java)
    http://www.lincom-asg.com/~rjamison/byacc/