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Advent of Code (Day 23 Part 1)
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const fs = require('fs'); | |
const INPUT = fs.readFileSync('./input.txt', 'utf-8').split('\n'); | |
const SIMPLE_INSTRUCTION = /(hlf|tpl|inc) (\w+)/; | |
const SIMPLE_JUMP_INSTRUCTION = /(jmp) ([+-]\d+)/; | |
const CONDITIONAL_JUMP_INSTRUCTION = /(jie|jio) (\w+), ([+-]\d+)/; | |
const PROCESSOR = new Map([ | |
['a', 0], | |
['b', 0] | |
]); | |
const MACRO_ASSEMBLER = { | |
hlf: (_, value) => value / 2, | |
tpl: (_, value) => value * 3, | |
inc: (_, value)=> value + 1, | |
jmp: offset => +offset, | |
jie: (offset, register) => register % 2 === 0 ? +offset : 1, | |
jio: (offset, register) => register === 1 ? +offset : 1 | |
}; | |
const parseInstruction = instruction => { | |
let parsed; | |
if (SIMPLE_INSTRUCTION.test(instruction)) parsed = instruction.match(SIMPLE_INSTRUCTION); | |
if (SIMPLE_JUMP_INSTRUCTION.test(instruction)) parsed = instruction.match(SIMPLE_JUMP_INSTRUCTION); | |
if (CONDITIONAL_JUMP_INSTRUCTION.test(instruction)) parsed = instruction.match(CONDITIONAL_JUMP_INSTRUCTION); | |
return { | |
instruction: parsed[1], | |
register: isNaN(parseInt(parsed[2])) ? parsed[2] : null, | |
offset: typeof parsed[3] === 'undefined' && parsed[1] === 'jmp' ? parsed[2] : parsed[3] | |
} | |
}; | |
let pointer = 0; | |
while (INPUT[pointer]) { | |
const instruction = INPUT[pointer]; | |
const parsed = parseInstruction(instruction); | |
if (['jmp', 'jie', 'jio'].indexOf(parsed.instruction) !== -1) { | |
pointer += MACRO_ASSEMBLER[parsed.instruction](parsed.offset, PROCESSOR.get(parsed.register)); | |
} else { | |
PROCESSOR.set(parsed.register, MACRO_ASSEMBLER[parsed.instruction](parsed.offset, PROCESSOR.get(parsed.register))); | |
pointer++; | |
} | |
} | |
const result = PROCESSOR.get('b'); | |
console.log(result); |
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