bitsy-parser/src/tile.rs

use crate::{optional_data_line, AnimationFrames, Image};
use crate::image::animation_frames_from_str;

#[derive(Clone, Debug, Eq)]
pub struct Tile {
    pub id: String,
    pub name: Option<String>,
    /// Can the player move over this tile?
    /// This is "optional" in that a tile can have `WAL true`, `WAL false` or neither.
    /// obviously Some(false) is functionally the same as None
    /// but we want to preserve the original formatting where possible.
    pub wall: Option<bool>,
    pub animation_frames: Vec<Image>,
    /// Bitsy has an undocumented feature where a tile can be rendered
    /// in a specific colour (`COL n`) from the current palette.
    pub colour_id: Option<u64>,
}

impl PartialEq for Tile {
    /// ignore id and name.
    fn eq(&self, other: &Self) -> bool {
        self.wall == other.wall
        &&
        self.animation_frames == other.animation_frames
        &&
        self.colour_id == other.colour_id
    }
}

impl Tile {
    fn name_line(&self) -> String {
        optional_data_line("NAME", self.name.as_ref())
    }

    fn wall_line(&self) -> String {
        if self.wall.is_some() {
            format!("\nWAL {}", self.wall.unwrap())
        } else {
            "".to_string()
        }
    }

    fn colour_line(&self) -> String {
        if self.colour_id.is_some() {
            format!("\nCOL {}", self.colour_id.unwrap())
        } else {
            "".to_string()
        }
    }

    // todo refactor
    // can we do map_in_place or something?

    pub fn invert(&mut self) {
        self.animation_frames = self.animation_frames.iter().map(|frame: &Image| {
            let mut image = frame.clone();
            image.invert();
            image
        }).collect()
    }

    pub fn flip(&mut self) {
        self.animation_frames = self.animation_frames.iter().map(|frame: &Image| {
            let mut image = frame.clone();
            image.flip();
            image
        }).collect()
    }

    pub fn mirror(&mut self) {
        self.animation_frames = self.animation_frames.iter().map(|frame: &Image| {
            let mut image = frame.clone();
            image.mirror();
            image
        }).collect()
    }

    pub fn rotate(&mut self) {
        self.animation_frames = self.animation_frames.iter().map(|frame: &Image| {
            let mut image = frame.clone();
            image.rotate();
            image
        }).collect()
    }
}

impl From<String> for Tile {
    fn from(string: String) -> Tile {
        let mut lines: Vec<&str> = string.lines().collect();

        let id = lines[0].replace("TIL ", "");

        let mut wall = None;
        let mut name = None;
        let mut colour_id = None;

        loop {
            let last_line = lines.pop().unwrap();

            if last_line.starts_with("WAL") {
                wall = Some(last_line.ends_with("true"));
            } else if last_line.starts_with("NAME") {
                name = Some(last_line.replace("NAME ", "").to_string());
            } else if last_line.starts_with("COL") {
                colour_id = Some(last_line.replace("COL ", "").parse().unwrap());
            } else {
                lines.push(last_line);
                break;
            }
        }

        let animation_frames = animation_frames_from_str(
            &lines[1..].join("\n")
        );

        Tile {
            id,
            name,
            wall,
            animation_frames,
            colour_id,
        }
    }
}

impl ToString for Tile {
    fn to_string(&self) -> String {
        format!(
            "TIL {}\n{}{}{}{}",
            self.id,
            self.animation_frames.to_string(),
            self.name_line(),
            self.wall_line(),
            self.colour_line(),
        )
    }
}

#[cfg(test)]
mod test {
    use crate::{Image, Tile, mock};

    #[test]
    fn tile_from_string() {
        let output = Tile::from(include_str!("test-resources/tile").to_string());

        let expected = Tile {
            id: "z".to_string(),
            name: Some("concrete 1".to_string()),
            wall: Some(true),
            animation_frames: vec![Image {
                pixels: vec![1; 64],
            }],
            colour_id: None,
        };

        assert_eq!(output, expected);
    }

    #[test]
    fn tile_to_string() {
        let output = Tile {
            id: "7a".to_string(),
            name: Some("chequers".to_string()),
            wall: None,
            animation_frames: vec![
                mock::image::chequers_1(),
                mock::image::chequers_2(),
            ],
            colour_id: None,
        }.to_string();

        let expected = include_str!("test-resources/tile-chequers").to_string();

        assert_eq!(output, expected);
    }

    #[test]
    fn partial_eq() {
        let     tile_a = crate::mock::tile_default();
        let mut tile_b = crate::mock::tile_default();
        tile_b.id = "0".to_string();
        assert_eq!(tile_a, tile_b);
        tile_b.name = None;
        assert_eq!(tile_a, tile_b);
    }
}