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Brainfuck interpreter in Ruby
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#!/usr/bin/env ruby | |
mem = Array.new(30_000) | |
iptr = dptr = 0 | |
prog = File.read ARGV.first | |
jmp = lambda { |op, a, b| | |
(iptr = iptr.send(op, 1); jmp.call(op, a, b) if prog[iptr] == a) until prog[iptr] == b | |
} | |
nop = lambda {} | |
cmds = { | |
'>' => lambda { dptr += 1 }, | |
'<' => lambda { dptr -= 1 }, | |
'+' => lambda { mem[dptr] = mem[dptr].to_i + 1 }, | |
'-' => lambda { mem[dptr] = mem[dptr].to_i - 1 }, | |
'.' => lambda { $stdout.printf mem[dptr].chr }, | |
',' => lambda { mem[dptr] = $stdin.readbyte }, | |
'[' => lambda { jmp.call(:+, '[', ']') if mem[dptr].to_i.zero? }, | |
']' => lambda { jmp.call(:-, ']', '[') unless mem[dptr].to_i.zero? } | |
} | |
(cmds.fetch(prog[iptr], nop).call; iptr += 1) while prog[iptr] |
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+++++ +++++ initialize counter (cell #0) to 10 | |
[ use loop to set the next four cells to 70/100/30/10 | |
> +++++ ++ add 7 to cell #1 | |
> +++++ +++++ add 10 to cell #2 | |
> +++ add 3 to cell #3 | |
> + add 1 to cell #4 | |
<<<< - decrement counter (cell #0) | |
] | |
> ++ . print 'H' | |
> + . print 'e' | |
+++++ ++ . print 'l' | |
. print 'l' | |
+++ . print 'o' | |
> ++ . print ' ' | |
<< +++++ +++++ +++++ . print 'W' | |
> . print 'o' | |
+++ . print 'r' | |
----- - . print 'l' | |
----- --- . print 'd' | |
> + . print '!' | |
> . print '\n' |
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