2019 cleanup: Introduced proper Error types for most days up until day 14

2019/day01_the_tyranny_of_the_rocket_equation/src/lib.rs

@@ -1,16 +1,22 @@
-pub fn run(input: &str) -> (usize, usize) {
-    let first = input.lines().map(|line| line.parse::<usize>().unwrap() / 3 -2).sum();
+use std::num::ParseIntError;
+
+pub fn run(input: &str) -> Result<(usize, usize), ParseIntError> {
+    let first = input.lines().map(|line| line.parse::<usize>().map(|i| i/3-2)).sum::<Result<usize, _>>()?;
     let second = input.lines().map(|line| {
-            let weight = line.parse::<usize>().unwrap();
-            let mut total = (weight/3).saturating_sub(2);
-            let mut next = (total/3).saturating_sub(2);
-            while next > 0 {
-                total += next;
-                next = (next/3).saturating_sub(2);
+            let parsed = line.parse::<usize>();
+            if let Ok(weight) = parsed  {
+                let mut total = (weight/3).saturating_sub(2);
+                let mut next = (total/3).saturating_sub(2);
+                while next > 0 {
+                    total += next;
+                    next = (next/3).saturating_sub(2);
+                }
+                Ok(total)
+            } else {
+                parsed
             }
-            total
-        }).sum::<usize>();
-    (first, second)
+        }).sum::<Result<usize, _>>()?;
+    Ok((first, second))
 }
 
 #[cfg(test)]
@@ -25,12 +31,12 @@ mod tests {
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (34241, 51316));
+        assert_eq!(run(&sample_input), Ok((34241, 51316)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (3363033, 5041680));
+        assert_eq!(run(&challenge_input), Ok((3363033, 5041680)));
     }
 }

2019/day02_1202_program_alarm/src/lib.rs

@@ -1,8 +1,9 @@
+use std::num::ParseIntError;
+
 use intcode_processor::intcode_processor::Cpu;
 
-pub fn run(input: &str) -> (isize, isize) {
-    let memory = input.split(',').map(|s| s.parse::<isize>().unwrap()).collect();
-    let cpu = Cpu::with_memory(memory);
+pub fn run(input: &str) -> Result<(isize, isize), ParseIntError> {
+    let cpu = Cpu::try_with_memory_from_str(input)?;
     let mut cpu_1 = cpu.clone();
     cpu_1.set(1, 12);
     cpu_1.set(2, 2);
@@ -21,7 +22,7 @@ pub fn run(input: &str) -> (isize, isize) {
             }
         }
     }
-    (first, second)
+    Ok((first, second))
 }
 
 #[cfg(test)]
@@ -36,12 +37,12 @@ mod tests {
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (3500, 213));
+        assert_eq!(run(&sample_input), Ok((3500, 213)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (3760627, 7195));
+        assert_eq!(run(&challenge_input), Ok((3760627, 7195)));
     }
 }

2019/day04_secure_container/src/lib.rs

@@ -1,9 +1,11 @@
-pub fn run(input: &str) -> (usize, usize) {
-    let range: Vec<_> = input.split('-').map(|n| n.parse::<usize>().unwrap()).collect();
+use std::num::ParseIntError;
+
+pub fn run(input: &str) -> Result<(usize, usize), ParseIntError> {
+    let range: Vec<_> = input.split('-').map(|n| n.parse::<usize>()).collect::<Result<Vec<_>, _>>()?;
     let valid_1: Vec<_> = (range[0]..=range[1]).filter(is_valid_1).collect();
     let first = valid_1.len();
     let second = valid_1.into_iter().filter(is_valid_2).count();
-    (first, second)
+    Ok((first, second))
 }
 
 fn is_valid_1(password: &usize) -> bool {
@@ -55,12 +57,12 @@ mod tests {
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (36, 14));
+        assert_eq!(run(&sample_input), Ok((36, 14)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (921, 603));
+        assert_eq!(run(&challenge_input), Ok((921, 603)));
     }
 }

2019/day05_sunny_with_a_chance_of_asteroids/src/lib.rs

@@ -1,7 +1,9 @@
+use std::num::ParseIntError;
+
 use intcode_processor::intcode_processor::{Cpu, OutputState};
 
-pub fn run(input: &str) -> (isize, isize) {
-    let mut cpu = Cpu::with_memory(input.split(',').map(|s| s.parse::<isize>().unwrap()).collect());
+pub fn run(input: &str) -> Result<(isize, isize), ParseIntError> {
+    let mut cpu = Cpu::try_with_memory_from_str(input)?;
     let mut cpu_2 = cpu.clone();
 
     cpu.set_input(1);
@@ -9,7 +11,7 @@ pub fn run(input: &str) -> (isize, isize) {
     cpu_2.set_input(5);
     let second = run_diagnostics(&mut cpu_2);
     
-    (first, second)
+    Ok((first, second))
 }
 
 fn run_diagnostics(cpu: &mut Cpu) -> isize {
@@ -36,6 +38,6 @@ mod tests {
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (9025675, 11981754));
+        assert_eq!(run(&challenge_input), Ok((9025675, 11981754)));
     }
 }

2019/day06_universal_orbit_map/src/lib.rs

@@ -6,28 +6,31 @@ struct Orbit {
     center_id: usize,
 }
 
-pub fn run(input: &str) -> (usize, usize) {
-    let graph: Vec<_> = graph_from(input);
+pub fn run(input: &str) -> Result<(usize, usize), String> {
+    let graph: Vec<_> = graph_from(input)?;
     let first = count_direct_and_indirect_orbits(&graph);
     let common_orbit = get_common_center(&graph, 1, 2);
 
     let second = distance(&graph, common_orbit, 1) + distance(&graph, common_orbit, 2) - 2;
-    (first, second)
+    Ok((first, second))
 }
 
-fn graph_from(map: &str) -> Vec<Orbit> {
+fn graph_from(map: &str) -> Result<Vec<Orbit>, String> {
     let mut bodies = HashMap::from([("COM", 0), ("YOU", 1), ("SAN", 2)]);
     let mut graph: Vec<Orbit> = Vec::new();
     for line in map.lines() {
-        let (center, trabant) = line.split_once(')').unwrap();
-        let mut bodies_len = bodies.len();
-        let center_id = *bodies.entry(center).or_insert(bodies_len);
-        bodies_len = bodies.len();
-        let trabant_id = *bodies.entry(trabant).or_insert(bodies_len);
-        graph.push(Orbit { center_id, trabant_id } );
+        if let Some((center, trabant)) = line.split_once(')') {
+            let mut bodies_len = bodies.len();
+            let center_id = *bodies.entry(center).or_insert(bodies_len);
+            bodies_len = bodies.len();
+            let trabant_id = *bodies.entry(trabant).or_insert(bodies_len);
+            graph.push(Orbit { center_id, trabant_id } );
+        } else {
+            return Err(format!("Malformed input: '{line}' doesn't contain a ')'."));
+        }
     }
     graph.sort();
-    graph
+    Ok(graph)
 }
 
 fn count_direct_and_indirect_orbits(graph: &[Orbit]) -> usize {
@@ -94,12 +97,12 @@ mod tests {
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (54, 4));
+        assert_eq!(run(&sample_input), Ok((54, 4)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (417916, 523));
+        assert_eq!(run(&challenge_input), Ok((417916, 523)));
     }
 }

2019/day07_amplification_circuit/src/lib.rs

@@ -1,9 +1,9 @@
-use std::{sync::{mpsc, Arc}, thread, collections::VecDeque};
+use std::{sync::{mpsc, Arc}, thread, collections::VecDeque, num::ParseIntError};
 
 use intcode_processor::intcode_processor::{Cpu, OutputState};
 
-pub fn run(input: &str) -> (isize, isize) {
-    let template = Cpu::try_with_memory_from_str(input).unwrap();
+pub fn run(input: &str) -> Result<(isize, isize), ParseIntError> {
+    let template = Cpu::try_with_memory_from_str(input)?;
     let mut first = 0;
     for perm in get_permutations(&(0..5).collect()) {
         let mut output = 0;
@@ -82,7 +82,7 @@ pub fn run(input: &str) -> (isize, isize) {
         }
         second = second.max(*output.lock().unwrap());
     }
-    (first, second)
+    Ok((first, second))
 }
 
 fn get_permutations(numbers: &Vec<isize>) -> Vec<Vec<isize>> {
@@ -116,19 +116,19 @@ mod tests {
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
         // The second part of the output is not verified, but that's what my solution produces.
-        assert_eq!(run(&sample_input), (65210, 76543));
+        assert_eq!(run(&sample_input), Ok((65210, 76543)));
     }
 
     #[test]
     fn test_sample_2() {
         let sample_input = read_file("tests/sample_input_2");
         // The first part of the output is not verified, but that's what my solution produces.
-        assert_eq!(run(&sample_input), (0, 18216));
+        assert_eq!(run(&sample_input), Ok((0, 18216)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (46248, 54163586));
+        assert_eq!(run(&challenge_input), Ok((46248, 54163586)));
     }
 }

2019/day09_sensor_boost/src/lib.rs

@@ -1,7 +1,9 @@
+use std::num::ParseIntError;
+
 use intcode_processor::intcode_processor::{Cpu, OutputState};
 
-pub fn run(input: &str) -> (isize, isize) {
-    let mut cpu = Cpu::try_with_memory_from_str(input).unwrap();
+pub fn run(input: &str) -> Result<(isize, isize), ParseIntError> {
+    let mut cpu = Cpu::try_with_memory_from_str(input)?;
     let mut cpu_2 = cpu.clone();
     cpu.set_input(1);
     let first = match cpu.run() {
@@ -13,7 +15,7 @@ pub fn run(input: &str) -> (isize, isize) {
         OutputState::DiagnosticCode(d) => d,
         e => panic!("Unexpected return code: {e:?}"),
     };
-    (first, second)
+    Ok((first, second))
 }
 
 #[cfg(test)]
@@ -28,6 +30,6 @@ mod tests {
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (2316632620, 78869));
+        assert_eq!(run(&challenge_input), Ok((2316632620, 78869)));
     }
 }

2019/day11_space_police/src/lib.rs

@@ -1,4 +1,4 @@
-use std::{collections::HashMap, isize};
+use std::{collections::HashMap, isize, num::ParseIntError};
 use intcode_processor::intcode_processor::{Cpu, OutputState};
 
 enum Direction { Up, Left, Down, Right }
@@ -39,8 +39,8 @@ impl Direction {
     }
 }
 
-pub fn run(input: &str) -> (usize, String) {
-    let mut cpu_1 = Cpu::try_with_memory_from_str(input).unwrap();
+pub fn run(input: &str) -> Result<(usize, String), ParseIntError> {
+    let mut cpu_1 = Cpu::try_with_memory_from_str(input)?;
     let mut cpu_2 = cpu_1.clone();
     let mut panels_1 = HashMap::new();
     let mut panels_2 = HashMap::from([((0, 0), 1)]);
@@ -48,7 +48,7 @@ pub fn run(input: &str) -> (usize, String) {
     paint(&mut cpu_2, &mut panels_2);
     let first = panels_1.len();
     let second = print(&panels_2);
-    (first, second)
+    Ok((first, second))
 }
 
 fn paint(cpu: &mut Cpu, panels: &mut HashMap<(isize, isize), isize>) {
@@ -100,6 +100,6 @@ mod tests {
  #    #    #    #  # # #  #  # # #  #  #   
  #### #### #### ###  #  #  ##  #  # #  #   
 "#;
-        assert_eq!(run(&challenge_input), (2539, expected[1..].to_string()));
+        assert_eq!(run(&challenge_input), Ok((2539, expected[1..].to_string())));
     }
 }

2019/day12_the_n-body_problem/src/lib.rs

@@ -1,3 +1,4 @@
+use core::fmt;
 use std::{iter::Sum, ops::AddAssign, num::ParseIntError};
 
 #[derive(Clone, Copy, PartialEq, Eq)]
@@ -37,6 +38,27 @@ impl Coordinate {
     }
 }
 
+#[derive(Debug, PartialEq, Eq)]
+pub enum ParseMoonError {
+    ParseIntError(std::num::ParseIntError),
+    InvalidCoordinates(usize),
+}
+
+impl From<ParseIntError> for ParseMoonError {
+    fn from(value: ParseIntError) -> Self {
+        Self::ParseIntError(value)
+    }
+}
+
+impl fmt::Display for ParseMoonError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::ParseIntError(v) => write!(f, "Error parsing coordinates: {v}"),
+            Self::InvalidCoordinates(n) => write!(f, "Error reading the coordinates list. It contains {n} components instead of 7."),
+        }
+    }
+}
+
 #[derive(Clone, PartialEq, Eq)]
 struct Moon {
     position: Coordinate,
@@ -44,11 +66,13 @@ struct Moon {
 }
 
 impl TryFrom<&str> for Moon {
-    type Error = ParseIntError;
+    type Error = ParseMoonError;
 
     fn try_from(value: &str) -> Result<Self, Self::Error> {
         let components: Vec<_> = value.split(&['=', ',', '>']).collect();
-        assert_eq!(components.len(), 7);
+        if components.len() != 7 {
+            return Err(ParseMoonError::InvalidCoordinates(components.len()));
+        }
         let x = components[1].parse()?;
         let y = components[3].parse()?;
         let z = components[5].parse()?;
@@ -82,8 +106,9 @@ impl LunarSystem {
     }
 }
 
-pub fn run(input: &str) -> (usize, usize) {
-    let moons: Vec<Moon> = input.lines().map(Moon::try_from).collect::<Result<Vec<Moon>, _>>().unwrap();
+pub fn run(input: &str) -> Result<(usize, usize), ParseMoonError> {
+    let moons: Vec<Moon> = input.lines().map(Moon::try_from).collect::<Result<Vec<Moon>, _>>()?;
+    //.unwrap_or_else(|err| panic!("Error parsing input into moons: {err}"));
     let mut system = LunarSystem { moons: moons.to_vec(), };
     for _ in 0..1000 {
         system.step_motion();
@@ -114,7 +139,7 @@ pub fn run(input: &str) -> (usize, usize) {
         }
     }
     let second = scm(periods[0], scm(periods[1], periods[2]));
-    (first, second)
+    Ok((first, second))
 }
 
 fn scm(lhs: usize, rhs: usize) -> usize {
@@ -142,12 +167,12 @@ mod tests {
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (14645, 4686774924));
+        assert_eq!(run(&sample_input), Ok((14645, 4686774924)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (7687, 334945516288044));
+        assert_eq!(run(&challenge_input), Ok((7687, 334945516288044)));
     }
 }

2019/day12_the_n-body_problem/tests/sample_input

@@ -1,4 +1,4 @@
-<x=-8, y=-10, z=0>
+<x=-8, y=-10, z=O>
 <x=5, y=5, z=10>
 <x=2, y=-7, z=3>
 <x=9, y=-8, z=-3>

2019/day14_space_stoichiometry/src/lib.rs

@@ -1,4 +1,25 @@
-use std::collections::{HashMap, VecDeque};
+use std::{collections::{HashMap, VecDeque}, fmt::Display, num::ParseIntError};
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum ParseError {
+    ParseIntError(std::num::ParseIntError),
+    LineMalformed(String),
+}
+
+impl From<ParseIntError> for ParseError {
+    fn from(value: ParseIntError) -> Self {
+        Self::ParseIntError(value)
+    }
+}
+
+impl Display for ParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::ParseIntError(e) => write!(f, "Unable to parse into integer: {e}"),
+            Self::LineMalformed(v) => write!(f, "Line is malformed: {v}"),
+        }
+    }
+}
 
 type Chemical = usize;
 
@@ -13,7 +34,7 @@ struct Reaction {
 }
 
 impl Reaction {
-    fn from(line: &str, chemicals: &mut Vec<String>) -> Self {
+    fn try_from(line: &str, chemicals: &mut Vec<String>) -> Result<Self, ParseError> {
         let mut get_chemical = |name: &str| -> usize {
             if let Some(idx) = chemicals.iter().position(|c| c == &name.to_string()) {
                 idx
@@ -22,34 +43,37 @@ impl Reaction {
                 chemicals.len()-1
             }
         };
-        let (in_str, out_str) = line.split_once(" => ").unwrap();
-        let in_components: Vec<_> = in_str.split(&[' ', ',']).chain([""].into_iter()).collect();
-        assert_eq!(in_components.len()%3, 0);
-        let out_components: Vec<_> = out_str.split(' ').collect();
-        assert_eq!(out_components.len(), 2);
-        let output = Reagent {
-            id: get_chemical(out_components[1]),
-            amount: out_components[0].parse().unwrap(), 
-        };
+        if let Some((in_str, out_str)) = line.split_once(" => ") {
+            let in_components: Vec<_> = in_str.split(&[' ', ',']).chain([""].into_iter()).collect();
+            assert_eq!(in_components.len()%3, 0);
+            let out_components: Vec<_> = out_str.split(' ').collect();
+            assert_eq!(out_components.len(), 2);
+            let output = Reagent {
+                id: get_chemical(out_components[1]),
+                amount: out_components[0].parse()?, 
+            };
 
-        let input = in_components.chunks(3).map(|c| Reagent { id: get_chemical(c[1]), amount: c[0].parse::<usize>().unwrap(), }).collect();
+            let input = in_components.chunks(3).map(|c| Reagent { id: get_chemical(c[1]), amount: c[0].parse::<usize>().unwrap(), }).collect();
 
-        Self {
-            input,
-            output,
+            Ok(Self {
+                input,
+                output,
+            })
+        } else {
+            Err(ParseError::LineMalformed(line.to_string()))
         }
     }
 }
 
-pub fn run(input: &str) -> (usize, usize) {
+pub fn run(input: &str) -> Result<(usize, usize), ParseError> {
     let mut chemicals = Vec::new();
-    let reactions: Vec<_> = input.lines().map(|line| Reaction::from(line, &mut chemicals)).collect();
+    let reactions: Vec<_> = input.lines().map(|line| Reaction::try_from(line, &mut chemicals)).collect::<Result<Vec<_>, _>>()?;
     let fuel = chemicals.iter().position(|chem| chem == &String::from("FUEL")).unwrap();
     let ore =  chemicals.iter().position(|chem| chem == &String::from("ORE")).unwrap();
     // dbg!(&chemicals);
     let first = break_down(&reactions, fuel, ore, 1);
     let second = bisection_find(1_000_000_000_000/first, 10_000_000_000_000/first, &reactions, fuel, ore, 1_000_000_000_000);
-    (first, second)
+    Ok((first, second))
 }
 
 fn bisection_find(lower: usize, upper: usize, reactions: &[Reaction], target: usize, raw: usize, stock: usize) -> usize {
@@ -109,12 +133,12 @@ mod tests {
     #[test]
     fn test_sample() {
         let sample_input = read_file("tests/sample_input");
-        assert_eq!(run(&sample_input), (2210736, 460664));
+        assert_eq!(run(&sample_input), Ok((2210736, 460664)));
     }
 
     #[test]
     fn test_challenge() {
         let challenge_input = read_file("tests/challenge_input");
-        assert_eq!(run(&challenge_input), (1582325, 2267486));
+        assert_eq!(run(&challenge_input), Ok((1582325, 2267486)));
     }
 }