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62 lines
1.5 KiB
62 lines
1.5 KiB
require "bundler/setup"
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require "minitest/autorun"
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require "parslet"
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Monkey = Struct.new(:id, :items, :operation, :test, :t, :f) do
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def throw_to(item)
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(item % test).zero? ? t : f
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end
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end
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class MonkeyParser < Parslet::Parser
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rule(:num) { match("[0-9]").repeat.as(:num) }
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rule(:space) { match("\\s").repeat }
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rule(:newline) { str("\n") }
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rule(:monkey) {
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space >> str("Monkey ") >> num.as(:id) >> str(":") >>
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space >> str("Starting items: ") >> ( num >> ( str(", ") >> num ).repeat ).as(:items) >>
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space >> str("Operation: new = ") >> (newline.absent? >> any).repeat.as(:op) >>
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space >> str("Test: divisible by ") >> num.as(:test) >>
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space >> str("If true: throw to monkey ") >> num.as(:true) >>
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space >> str("If false: throw to monkey ") >> num.as(:false) >>
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space
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}
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rule(:monkeys) { monkey.repeat }
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root(:monkeys)
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end
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class MonkeyTransform < Parslet::Transform
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rule(num: simple(:x)) { x.to_i }
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rule(
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id: simple(:id),
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items: sequence(:items),
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op: simple(:op),
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test: simple(:test),
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true: simple(:t),
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false: simple(:f),
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) {
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Monkey.new(id, items, op, test, t, f)
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}
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end
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class TestDay11 < Minitest::Test
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def test_day_11
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tree = MonkeyParser.new.parse(<<~MONKEY)
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Monkey 0:
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Starting items: 79, 98
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Operation: new = old * 19
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Test: divisible by 23
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If true: throw to monkey 2
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If false: throw to monkey 3
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MONKEY
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monkeys = MonkeyTransform.new.apply(tree)
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assert_equal [Monkey.new(0, [79, 98], "old * 19", 23, 2, 3)], monkeys
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end
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end
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