Execute Brain****/Ruby: Difference between revisions
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{{implementation|Brainf***}}{{collection|RCBF}} |
{{implementation|Brainf***}}{{collection|RCBF}} |
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An implementation of a [[Brainf***]] interpreter in [[Ruby]]. |
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More effort could be made to read a program from a file or from stdin. |
More effort could be made to read a program from a file or from stdin. |
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Revision as of 20:20, 30 December 2009
Execute Brain****/Ruby is an implementation of Brainf***.
Other implementations of Brainf***.
Execute Brain****/Ruby is part of RCBF. You may find other members of RCBF at Category:RCBF.
An implementation of a Brainf*** interpreter in Ruby. More effort could be made to read a program from a file or from stdin.
<lang ruby>class RCBF
def initialize(program) @d = [0] * 30_000 @program = program @jumpback_table = read_program end def read_program jumpback_table = {} nest_level = 0 start_idx = [] @program.each_char.each_with_index do |char, idx| case char when "[" start_idx[nest_level] = idx nest_level += 1 when "]" nest_level -= 1 jumpback_table[idx] = start_idx[nest_level] end end jumpback_table end
def run dc = 0 pc = 0 while pc < @program.length print [pc, @program[pc].chr].inspect if $DEBUG
case @program[pc] when ?> dc += 1 print "\t#{dc}" if $DEBUG when ?< dc -= 1 print "\t#{dc}" if $DEBUG when ?+ @d[dc] += 1 print "\t#{dc},#{@d[dc]}" if $DEBUG when ?- @d[dc] -= 1 print "\t#{dc},#{@d[dc]}" if $DEBUG when ?. print "\t#{dc},#{@d[dc]}\t" if $DEBUG print @d[dc].chr when ?, then @d[dc] = $stdin.getc print "\t#{dc},#{@d[dc]}" if $DEBUG when ?[ then if @d[dc] == 0 pc = @jumpback_table.invert[pc] p " #{[pc,@program[pc].chr].inspect}" if $DEBUG end when ?] then if @d[dc] != 0 pc = @jumpback_table[pc] p " #{[pc,@program[pc].chr].inspect}" if $DEBUG end end puts if $DEBUG pc += 1 end end
end
- output 'Hello World!\n'
helloworld = <<PROGRAM ++++++++++[>+++++++>++++++++++>+++>+<<<<-] >++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>. PROGRAM bf = RCBF.new(helloworld) bf.run
- use nested loop to increment count to 64 and print (should be '@')"
- 64 = 4*4*4
nestedloop = '>>++++[<++++[<++++>-]>-]<<.[-]++++++++++.' bf = RCBF.new(nestedloop) bf.run</lang>
Output:
Hello World! @