Ruby parser written in pure Ruby

 ruby_parser (RP) can be used to parse and check syntax of Ruby code.
 "Pure Ruby" in this context means the parser's code
 * consists solely of Ruby source files
 * does not add any native extensions or other C code (eg. with RubyInline)
   which requires a C compiler to be present on the user's system
 .
 It utilizes racc and its output is same as that of ParseTree's.