Execute Brain****/Ruby: Difference between revisions
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{{implementation|Brainf***}}{{collection|RCBF}} |
{{implementation|Brainf***}}{{collection|RCBF}} |
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===Version 1=== |
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An implementation of a [[Brainf***]] interpreter in [[Ruby]]. |
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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< |
<syntaxhighlight lang="ruby">class RCBF |
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def initialize(program) |
def initialize(program) |
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@d = [0] * 30_000 |
@d = [0] * 30_000 |
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# use nested loop to increment count to 64 and print (should be '@') |
# use nested loop to increment count to 64 and print (should be '@') |
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# followed by a newline |
# followed by a newline |
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RCBF.new('>>++++[<++++[<++++>-]>-]<<.[-]++++++++++.').run</ |
RCBF.new('>>++++[<++++[<++++>-]>-]<<.[-]++++++++++.').run</syntaxhighlight> |
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{{out}} |
{{out}} |
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<pre>Hello World! |
<pre>Hello World! |
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@</pre> |
@</pre> |
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===Version 2=== |
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This variant converts the brainfuck into Ruby code and runs that instead. |
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Do note that this requires Ruby1.9.1 or later, earlier versions need a somewhat more verbose variant. |
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BF code may be read from a file or taken from STDIN. |
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<syntaxhighlight lang="ruby">eval 'm=Hash.new(p=0);'+ARGF.read.gsub( |
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/./, |
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'>' => 'p+=1;', |
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'<' => 'p-=1;', |
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'+' => 'm[p]+=1;', |
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'-' => 'm[p]-=1;', |
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'[' => '(;', |
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']' => ')while((m[p]&=255)!=0);', |
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'.' => 'putc(m[p]&=255);', |
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',' => 'm[p]=STDIN.getc.ord if !STDIN.eof;')</syntaxhighlight> |
Latest revision as of 11:57, 1 September 2022
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.
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.
class RCBF
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]] 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 ?,
@d[dc] = $stdin.getc
print "\t#{dc},#{@d[dc]}" if $DEBUG
when ?[
if @d[dc] == 0
pc = invert_table[pc]
print " #{[pc,@program[pc]]}" if $DEBUG
end
when ?]
if @d[dc] != 0
pc = @jumpback_table[pc]
print " #{[pc,@program[pc]]}" 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 '@')
# followed by a newline
RCBF.new('>>++++[<++++[<++++>-]>-]<<.[-]++++++++++.').run
- Output:
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.
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;')