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|
import gleam/io
import gleam/list
import gleam/function as fun
import gleam/result as res
import gleam/map.{Map}
import ext/listx
import ext/resultx as resx
import util/input_util
import util/parser as p
const allowed_fields = ["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid", "cid"]
const required_fields = ["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"]
const eye_colors = ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"]
type Passport {
Passport(fields: Map(String, String))
}
fn parse_passports(from text: String) -> List(Passport) {
let key_parser =
p.any_str_of_len(3)
|> p.labeled(with: "key")
let value_parser =
p.str1_until_ws()
|> p.labeled(with: "value")
let field_parser =
key_parser
|> p.then_skip(p.literal(":"))
|> p.then(value_parser)
|> p.labeled(with: "field")
let passport_parser =
field_parser
|> p.sep1(by: p.ws_gc())
|> p.map(with: fun.compose(map.from_list, Passport))
|> p.labeled(with: "passport")
let input_parser =
passport_parser
|> p.sep1(by: p.literal("\n\n"))
|> p.then_skip(p.opt(p.ws_gc()))
|> p.labeled(with: "input")
text
|> p.parse_entire(with: input_parser)
|> resx.assert_unwrap
}
fn is_valid1(passport: Passport) -> Bool {
let has_only_allowed_keys =
map.keys(passport.fields)
|> list.all(satisfying: list.contains(allowed_fields, _))
let has_all_required_keys =
required_fields
|> list.all(satisfying: list.contains(map.keys(passport.fields), _))
has_only_allowed_keys && has_all_required_keys
}
fn is_valid2(passport: Passport) -> Bool {
let int_between = fn(min, max) {
p.int()
|> p.satisfying(rule: fn(number) { min <= number && number <= max })
|> p.ignore
}
let validators = [
#("byr", int_between(1920, 2002)),
#("iyr", int_between(2010, 2020)),
#("eyr", int_between(2020, 2030)),
#(
"hgt",
p.or(
int_between(150, 193)
|> p.then(p.literal("cm")),
int_between(59, 76)
|> p.then(p.literal("in")),
)
|> p.ignore,
),
#(
"hcl",
p.literal("#")
|> p.then(
p.gc_in(range: "0123456789abcdef")
|> p.repeat(times: 6),
)
|> p.ignore,
),
#(
"ecl",
eye_colors
|> list.map(with: p.literal)
|> p.any
|> p.ignore,
),
#(
"pid",
p.digit()
|> p.str_of_len(9)
|> p.ignore,
),
]
is_valid1(passport) && list.all(
validators,
satisfying: fn(validator) {
let #(key, parser) = validator
passport.fields
|> map.get(key)
|> res.then(apply: fn(value) {
value
|> p.parse_entire(with: parser)
|> res.replace_error(Nil)
})
|> res.is_ok
},
)
}
fn part1(text: String) -> Int {
text
|> parse_passports
|> listx.count(satisfying: is_valid1)
}
fn part2(text: String) -> Int {
text
|> parse_passports
|> listx.count(satisfying: is_valid2)
}
pub fn run() -> Nil {
let test = input_util.read_text("test04")
assert 2 = part1(test)
assert 2 = part2(test)
let input = input_util.read_text("day04")
io.debug(part1(input))
io.debug(part2(input))
Nil
}
|
