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brainfuck.rb
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brainfuck.rb
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class BrainFuck
def initialize(code)
@code = code
@iptr = 0
@dptr = 0
@data = Array.new(30000){0}
end
def run()
len = @code.length
while @iptr < len
count = 1
case @code[@iptr]
when '>' then @dptr += 1
when '<' then @dptr -= 1
when '+' then @data[@dptr] += 1
when '-' then @data[@dptr] -= 1
when '.' then print @data[@dptr].chr
when ',' then @data[@dptr] = STDIN.gets.chomp[0].ord
when '['
if @data[@dptr] == 0 then
@iptr += 1
while count > 0
count += 1 if @code[@iptr] == '['
count -= 1 if @code[@iptr] == ']'
@iptr += 1
end
@iptr -= 1
end
when ']'
if @data[@dptr] != 0 then
@iptr -= 1
while count > 0
count += 1 if @code[@iptr] == ']'
count -= 1 if @code[@iptr] == '['
@iptr -= 1
end
end
end
@iptr += 1
end
end
end
BrainFuck.new(File.read(ARGV[0])).run()