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@@ -0,0 +1,206 @@
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+extern crate chrono;
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+extern crate regex;
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+
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+use std::error::Error;
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+use std::fs::File;
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+use std::io::{BufRead, BufReader};
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+use std::fmt;
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+use std::collections::{HashMap, HashSet};
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+use std::iter::FromIterator;
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+
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+use chrono::prelude::*;
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+use regex::{Regex, Captures};
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+
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+const INPUT: &str = "inputs/4.txt";
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+
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+#[derive(Debug, PartialEq)]
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+enum Record {
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+ Start {
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+ time: NaiveDateTime,
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+ guard_id: u32,
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+ },
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+ Sleep {
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+ time: NaiveDateTime,
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+ },
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+ Wake {
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+ time: NaiveDateTime,
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+ },
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+}
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+
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+#[derive(Debug, Clone, PartialEq)]
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+struct MalformedRecord {
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+ details: String
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+}
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+
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+impl MalformedRecord {
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+ fn new(msg: &str) -> MalformedRecord {
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+ MalformedRecord{ details: msg.to_string() }
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+ }
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+}
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+
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+impl fmt::Display for MalformedRecord {
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+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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+ write!(f, "{}", self.details)
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+ }
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+}
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+
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+impl Error for MalformedRecord {
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+ fn description(&self) -> &str {
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+ &self.details
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+ }
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+}
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+
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+fn read_records(filename: &str) -> Result<Vec<Record>, Box<Error>> {
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+ let mut records: Vec<Record> = Vec::new();
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+ let record_regex =
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+ Regex::new(r"\[(?P<timestamp>\d{4}-\d{2}-\d{2}\s\d{2}:\d{2})\]\s(?:(?P<start>Guard #(?P<guard_id>\d+) begins shift)|(?P<sleep>falls asleep)|(?P<wake>wakes up))")?;
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+ let file = File::open(filename)?;
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+ for line in BufReader::new(file).lines() {
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+ match record_regex.captures(&line?) {
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+ Some(captures) => {
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+ println!("{:?}", NaiveDateTime::parse_from_str(
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+ &get_captured_field(&captures, "timestamp")?,
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+ "%Y-%m-%d %H:%M")?);
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+ if has_captured_field(&captures, "start")? {
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+ records.push(Record::Start {
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+ time: NaiveDateTime::parse_from_str(
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+ &get_captured_field(&captures, "timestamp")?,
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+ "%Y-%m-%d %H:%M")?,
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+ guard_id: get_captured_field(&captures, "guard_id")?.parse()?,
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+ });
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+ } else if has_captured_field(&captures, "sleep")? {
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+ records.push(Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ &get_captured_field(&captures, "timestamp")?,
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+ "%Y-%m-%d %H:%M")?,
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+ });
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+ } else {
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+ records.push(Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ &get_captured_field(&captures, "timestamp")?,
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+ "%Y-%m-%d %H:%M")?,
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+ });
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+ }
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+ },
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+ None => return Err(Box::new(MalformedRecord {
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+ details: "Malformed record line, no fields could be found".to_string()
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+ })),
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+ };
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+ }
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+ Ok(records)
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+}
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+
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+fn get_captured_field(captures: &Captures, field: &str) -> Result<String, Box<Error>> {
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+ match captures.name(field) {
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+ Some(capture) => Ok(String::from(capture.as_str())),
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+ None => return Err(Box::new(MalformedRecord {
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+ details: format!("Malformed record line, field {} could not be found", field)
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+ }))
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+ }
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+}
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+
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+fn has_captured_field(captures: &Captures, field: &str) -> Result<bool, Box<Error>> {
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+ match captures.name(field) {
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+ Some(_) => Ok(true),
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+ None => Ok(false)
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+ }
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+}
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+
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+
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+#[cfg(test)]
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+mod tests {
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+ use super::*;
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+
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+ const TEST_INPUT: &str = "inputs/4_test.txt";
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+ const TEST_INPUT_MALFORMED: &str = "inputs/4_test_malformed.txt";
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+
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+ #[test]
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+ fn reads_records_file() {
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+ assert_eq!(read_records(TEST_INPUT).unwrap(), vec![
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+ Record::Start {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-01 00:00", "%Y-%m-%d %H:%M").unwrap(),
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+ guard_id: 10,
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+ },
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+ Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-01 00:05", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-01 00:25", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-01 00:30", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-01 00:55", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Start {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-01 23:58", "%Y-%m-%d %H:%M").unwrap(),
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+ guard_id: 99,
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+ },
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+ Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-02 00:40", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-02 00:50", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Start {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-03 00:05", "%Y-%m-%d %H:%M").unwrap(),
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+ guard_id: 10,
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+ },
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+ Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-03 00:24", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-03 00:29", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Start {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-04 00:02", "%Y-%m-%d %H:%M").unwrap(),
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+ guard_id: 99,
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+ },
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+ Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-04 00:36", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-04 00:46", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Start {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-05 00:03", "%Y-%m-%d %H:%M").unwrap(),
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+ guard_id: 99,
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+ },
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+ Record::Sleep {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-05 00:45", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ Record::Wake {
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+ time: NaiveDateTime::parse_from_str(
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+ "1518-11-05 00:55", "%Y-%m-%d %H:%M").unwrap(),
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+ },
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+ ]);
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+ }
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+
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+ #[test]
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+ fn errors_on_malformed_records_file() {
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+ match read_records(TEST_INPUT_MALFORMED) {
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+ Ok(_) => assert!(false, "read_records should have returned an error"),
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+ Err(err) => assert_eq!(
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+ (*err).description(),
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+ "Malformed record line, no fields could be found".to_string(),
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+ ),
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+ }
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+ }
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+}
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