Execute HQ9+/Ruby

Execute HQ9+/Ruby is an implementation of HQ9+. Other implementations of HQ9+.

Execute HQ9+/Ruby is part of RCHQ9+. You may find other members of RCHQ9+ at Category:RCHQ9+.

This Ruby program implements an HQ9+ interpreter. <lang ruby>class HQ9plus

 Dispatch = Hash.new(:unknown).merge({
     'h' => :hello, 
     'q' => :quine, 
     '9' => :beer, 
     '+' => :accumulate
 })

 def initialize(opts={})
   @program = if    opts[:program]  then opts[:program]
              elsif opts[:filename] then File.read(opts[:filename])
              else  
              end
   @accumulator = 0
 end
 attr_reader :accumulator

 def run
   @program.downcase.each_char {|char| self.send Dispatch[char]}
 end

 def hello
   puts "Hello, world!"
 end

 def quine
   puts @program
 end

 def beer
   puts '99 bottles here ...'
 end

 def accumulate
   @accumulator += 1
 end

 def unknown
   # do nothing
 end

end

hq9 = HQ9plus.new(:program => '+qhp;+9Q') hq9.run puts hq9.accumulator</lang>

Output:

+qhp;+9Q
Hello, world!
99 bottles here ...
+qhp;+9Q
2