Execute Brain****/Ruby: Difference between revisions
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{{implementation|Brainf***}}{{collection|RCBF}}
===Version 1===
An implementation of a [[Brainf***]] interpreter in [[Ruby]].
More effort could be made to read a program from a file or from stdin.
<
def initialize(program)
@d = [0] * 30_000
@program = program
@jumpback_table = read_program
end
def read_program
jumpback_table = {}
jump_to = []
@program.each_char.with_index do |char, idx|
case char
when "[" then jump_to.push(idx)
when "]" then jumpback_table[idx] = jump_to.pop
end
end
jumpback_table
end
def run
invert_table = @jumpback_table.invert
dc = 0
pc = 0
while pc < @program.length
print [pc, @program[pc]
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 ?,
@d[dc] = $stdin.getc
print "\t#{dc},#{@d[dc]}" if $DEBUG
when ?[
if @d[dc] == 0
pc
end
when ?]
if @d[dc] != 0
pc
end
end
Line 49 ⟶ 64:
end
end
end
# output 'Hello World!\n'▼
<pre>irb(main):048:0> helloworld = '++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.'▼
helloworld = <<PROGRAM
++++++++++[>+++++++>++++++++++>+++>+<<<<-]
irb(main):049:0> bf = RCBF.new(helloworld)▼
▲
PROGRAM
bf.run
▲Hello World!
=> nil</pre>▼
# use nested loop to increment count to 64 and print (should be '@')
# followed by a newline
RCBF.new('>>++++[<++++[<++++>-]>-]<<.[-]++++++++++.').run</syntaxhighlight>
{{out}}
<pre>Hello World!
===Version 2===
This variant converts the brainfuck into Ruby code and runs that instead.
Do note that this requires Ruby1.9.1 or later, earlier versions need a somewhat more verbose variant.
BF code may be read from a file or taken from STDIN.
<syntaxhighlight lang="ruby">eval 'm=Hash.new(p=0);'+ARGF.read.gsub(
/./,
'>' => 'p+=1;',
'<' => 'p-=1;',
'+' => 'm[p]+=1;',
'-' => 'm[p]-=1;',
'[' => '(;',
']' => ')while((m[p]&=255)!=0);',
'.' => 'putc(m[p]&=255);',
',' => 'm[p]=STDIN.getc.ord if !STDIN.eof;')</syntaxhighlight>
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