commit 24d2d2390b4cc9e8ef13899aca19dc4c0139eb91 · nasso.dev/navy

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src/parser.rs
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       use std::{fs::File, io::Read, path::Path};

     

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       #[derive(Debug)]

     

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       pub enum ParserError {

     

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           InvalidShipCount,

     

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           InvalidCoordCount,

     

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           InvalidCoord,

     

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           IO(std::io::Error),

     

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       }

     

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       impl From<std::io::Error> for ParserError {

     

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           fn from(value: std::io::Error) -> Self {

     

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               ParserError::IO(value)

     

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           }

     

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       }

     

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       #[derive(Debug, PartialEq, Eq)]

     

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       pub struct Vector2u16 {

     

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           x: u16,

     

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           y: u16,

     

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       }

     

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       impl Vector2u16 {

     

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           pub fn new(x: u16, y: u16) -> Self {

     

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               Vector2u16 {x: x, y: y}

     

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           }

     

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       }

     

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       #[derive(Debug, PartialEq, Eq)]

     

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       pub struct Boat {

     

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           first_pos: Vector2u16,

     

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           last_pos: Vector2u16,

     

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       }

     

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       impl Boat {

     

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           pub fn new(first_pos: Vector2u16, last_pos: Vector2u16) -> Self {

     

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               Boat { first_pos: first_pos, last_pos: last_pos }

     

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           }

     

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       }

     

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       pub fn parse_file(file_path: &Path) -> Result<[Boat; 4], ParserError> {

     

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           let mut file = File::open(file_path)?;

     

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           Ok(parse_ships(&mut file)?)

     

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       }

     

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       pub fn parse_ships<T: Read>(file: &mut T) -> Result<[Boat; 4], ParserError> {

     

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           let mut content = String::new();

     

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           file.read_to_string(&mut content)?;

     

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           let lines: Vec<&str> = content.lines().collect();

     

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           if lines.len() != 4 {

     

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               return Err(ParserError::InvalidShipCount);

     

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           }

     

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           let boats = [

     

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               create_ship(lines[0])?,

     

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               create_ship(lines[1])?,

     

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               create_ship(lines[2])?,

     

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               create_ship(lines[3])?,

     

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           ];

     

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           Ok(boats)

     

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       }

     

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       fn create_ship(line: &str) -> Result<Boat, ParserError> {

     

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           let coordinates: Vec<&str> = line.split(":").collect();

     

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           if coordinates.len() != 2 {

     

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               return Err(ParserError::InvalidCoordCount);

     

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           }

     

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           Ok(Boat::new(create_coord(coordinates[0])?, create_coord(coordinates[1])?))

     

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       }

     

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       fn create_coord(coord_str: &str) -> Result<Vector2u16, ParserError> {

     

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           let mut str_iter = coord_str.chars();

     

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           let Some(col_c) = str_iter.next() else {

     

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               return Err(ParserError::InvalidCoord);

     

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           };

     

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           let col = (col_c as u16) - ('A' as u16);

     

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           let Some(row_c) = str_iter.next() else {

     

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               return Err(ParserError::InvalidCoord);

     

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           };

     

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           let row = (row_c as u16) - ('0' as u16) - 1;

     

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           if col > 7 || row > 7 {

     

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               return Err(ParserError::InvalidCoord);

     

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           }

     

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           Ok(Vector2u16::new(col, row))

     

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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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           #[test]

     

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           fn test_create_coord() -> Result<(), ParserError> {

     

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               let coord1 = create_coord("D5")?;

     

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               assert_eq!(coord1.x, 3);

     

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               assert_eq!(coord1.y, 4);

     

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               let coord2 = create_coord("A1")?;

     

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               assert_eq!(coord2.x, 0);

     

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               assert_eq!(coord2.y, 0);

     

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               let coord3 = create_coord("H8")?;

     

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               assert_eq!(coord3.x, 7);

     

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               assert_eq!(coord3.y, 7);

     

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               Ok(())

     

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           }

     

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           #[test]

     

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           fn test_create_install_coord() {

     

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               let coord = create_coord("G9");

     

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               assert!(coord.is_err());

     

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           }

     

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           #[test]

     

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           fn test_create_bad_coord() {

     

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               let coord = create_coord("bad");

     

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               assert!(coord.is_err());

     

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           }

     

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           #[test]

     

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           fn test_create_ship() -> Result<(), ParserError> {

     

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               let ship = create_ship("C4:B1")?;

     

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               assert_eq!(ship.first_pos.x, 2);

     

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               assert_eq!(ship.first_pos.y, 3);

     

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               assert_eq!(ship.last_pos.x, 1);

     

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               assert_eq!(ship.last_pos.y, 0);

     

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               Ok(())

     

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           }

     

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           #[test]

     

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           fn test_create_bad_ship() {

     

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               let ship = create_ship("invalid");

     

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               assert!(ship.is_err());

     

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               let ship2 = create_ship("C9:B4");

     

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               assert!(ship2.is_err());

     

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           }

     

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           #[test]

     

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           fn test_parse_ships() -> Result<(), ParserError> {

     

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               let file = b"B4:C2\nD1:F3\nF1:F5\nA1:A2";

     

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               let ships = parse_ships(&mut &file[..])?;

     

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               assert_eq!(ships[0], Boat::new(Vector2u16::new(1, 3), Vector2u16::new(2, 1)));

     

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               assert_eq!(ships[1], Boat::new(Vector2u16::new(3, 0), Vector2u16::new(5, 2)));

     

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               assert_eq!(ships[2], Boat::new(Vector2u16::new(5, 0), Vector2u16::new(5, 4)));

     

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               assert_eq!(ships[3], Boat::new(Vector2u16::new(0, 0), Vector2u16::new(0, 1)));

     

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               Ok(())

     

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           }

     

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       }