59 lines
1.4 KiB
Crystal
59 lines
1.4 KiB
Crystal
require "random"
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class String
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@@nearby_chars = {
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'q' => ['w', 'a'],
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'w' => ['q', 'e', 's'],
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'e' => ['w', 'r', 'd'],
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'r' => ['e', 't', 'f'],
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't' => ['r', 'y', 'g'],
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'y' => ['t', 'h', 'u'],
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'u' => ['y', 'j', 'i'],
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'i' => ['u', 'k', 'o'],
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'o' => ['i', 'l', 'p'],
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'p' => ['o', 'l'],
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'a' => ['q', 's', 'z'],
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's' => ['w', 'r', 'a', 'x'],
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'd' => ['s', 'e', 'f', 'x', 'c'],
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'f' => ['d', 'r', 'x', 'c', 'v'],
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'g' => ['f', 't', 'h', 'v', 'b'],
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'h' => ['g', 'y', 'j', 'b', 'n'],
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'j' => ['h', 'u', 'k', 'n', 'm'],
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'k' => ['j', 'i', 'l', 'm'],
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'l' => ['k', 'o', 'p'],
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'z' => ['a', 's', 'x'],
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'x' => ['z', 's', 'd', 'c'],
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'c' => ['x', 'd', 'f', 'v'],
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'v' => ['c', 'f', 'g', 'b'],
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'b' => ['v', 'g', 'h', 'n'],
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'n' => ['b', 'h', 'j', 'm'],
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'm' => ['n', 'j', 'k', 'l'],
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' ' => [' ']
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}
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def mutate
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return self if Random.rand > 0.1
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mutations = [
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->mutate_modify,
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->mutate_insert
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]
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return mutations.sample(1)[0].call.mutate
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end
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def mutate_modify
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index = Random.rand(size)
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was_upcase = self[index].uppercase?
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char = self[index].downcase
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char = @@nearby_chars[char].sample(1)[0]
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char = char.upcase if was_upcase
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new_chars = chars
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new_chars[index] = char
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return new_chars.join("")
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end
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def mutate_insert
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index = Random.rand(size)
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return insert(index, ' ')
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end
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end
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