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const data = require('./data')
const rules = {}, regexps = {}
const [unorderedRules, messages] = data.split('\n\n').map(l => l.split(/\n/g).filter(Boolean))
unorderedRules.forEach(r => rules[r.split(': ')[0]] = r.split(': ')[1])
const find = (rule, rules) => {
if (rule in regexps) { return regexps[rule] }
let newRule = ''
if (/^".*"$/.test(rule)) {
newRule = rule.replace(/"/g, '')
} else if (/\|/.test(rule)) {
const [r1, r2] = rule.split(' | ')
newRule = `(${find(r1, rules)}|${find(r2, rules)})`
} else {
newRule = rule.split(' ').map(nr => find(rules[nr], rules)).join('')
}
regexps[rule] = newRule
return newRule
}
rules['8'] = '42 | 42 8'
rules['11'] = '42 31 | 42 11 31'
find(rules[42], rules)
find(rules[31], rules)
const regexp42 = new RegExp(regexps[rules[42]], 'g')
const regexp31 = new RegExp(regexps[rules[31]], 'g')
const customRegexp = new RegExp(`^(?<g42>(${regexps[rules[42]]})+)(?<g31>(${regexps[rules[31]]})+)$`)
let result = 0
messages.forEach(m => {
const matches = customRegexp.exec(m)
if (matches) {
const res42 = matches.groups.g42.match(regexp42).length
const res31 = matches.groups.g31.match(regexp31).length
if (res42 > res31) { result++ }
}
})
console.log('Answer: ', result)
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