97 lines
2.8 KiB
Rust
97 lines
2.8 KiB
Rust
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// Copyright 2023 Christian Ulrich
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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use std::io;
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pub struct Game {
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id: u32,
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red: Vec<u32>,
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green: Vec<u32>,
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blue: Vec<u32>,
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}
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pub struct Games {
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inner: Vec<Game>,
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}
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impl Game {
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pub fn from_str(input: &str) -> Result<Self, &'static str> {
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let (id_part, data) = input.split_once(':').ok_or("syntax error 1")?;
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let id = id_part
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.split_once(' ')
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.ok_or("syntax error 2")?
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.1
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.parse()
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.map_err(|_| "syntax error 3")?;
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let mut result = Self {
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id: id,
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red: Vec::new(),
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green: Vec::new(),
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blue: Vec::new(),
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};
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for drawing in data.split(';') {
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for color in drawing.split(',').map(str::trim) {
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let (count, name) = color.split_once(' ').ok_or("syntax error 4")?;
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match name {
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"red" => result
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.red
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.push(count.parse().map_err(|_| "syntax error 5")?),
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"green" => result
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.green
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.push(count.parse().map_err(|_| "syntax error")?),
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"blue" => result
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.blue
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.push(count.parse().map_err(|_| "syntax error 6")?),
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_ => return Err("syntax error"),
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}
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}
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}
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Ok(result)
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}
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pub fn id(&self) -> u32 {
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self.id
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}
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pub fn red_count(&self) -> u32 {
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*self.red.iter().max().unwrap_or(&0)
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}
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pub fn green_count(&self) -> u32 {
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*self.green.iter().max().unwrap_or(&0)
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}
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pub fn blue_count(&self) -> u32 {
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*self.blue.iter().max().unwrap_or(&0)
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}
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}
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impl Games {
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pub fn from_stdin() -> Result<Self, &'static str> {
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let mut games = Vec::new();
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for line in io::stdin().lines() {
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let line = line.unwrap();
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if line.len() > 0 {
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games.push(Game::from_str(&line)?);
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}
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}
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Ok(Self { inner: games })
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}
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pub fn iter(&mut self) -> std::slice::Iter<'_, Game> {
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self.inner.iter()
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}
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}
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