nano9 0.1.0-alpha.3

A Pico-8 compatibility layer for Bevy
Documentation 
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use bevy_mod_scripting::core::{
    bindings::{function::from::FromScript, script_value::ScriptValue, WorldAccessGuard},
    error::InteropError,
};

use bevy::prelude::*;
use std::{any::TypeId, borrow::Borrow, collections::HashMap, fmt::Display, hash::Hash};

#[allow(non_camel_case_types)]
pub struct f32Value;
impl FromScript for f32Value {
    type This<'w> = f32;
    fn from_script(
        value: ScriptValue,
        _world: WorldAccessGuard<'_>,
    ) -> Result<Self::This<'_>, InteropError> {
        match value {
            ScriptValue::Float(f) => Ok(f as f32),
            ScriptValue::Integer(i) => Ok(i as f32),
            x => Err(InteropError::value_mismatch(TypeId::of::<f32>(), x)),
        }
    }
}

pub struct Vec2Value;
impl FromScript for Vec2Value {
    type This<'w> = Vec2;
    fn from_script(
        value: ScriptValue,
        world: WorldAccessGuard<'_>,
    ) -> Result<Self::This<'_>, InteropError> {
        match value {
            ScriptValue::List(l) => {
                let n = l.len();
                let mut i = l.into_iter();
                if n == 2 {
                    let x = f32Value::from_script(i.next().unwrap(), world.clone())?;
                    let y = f32Value::from_script(i.next().unwrap(), world)?;
                    Ok(Vec2::new(x, y))
                } else {
                    Err(InteropError::length_mismatch(2, n))
                }
            }
            ScriptValue::Map(mut v) => {
                let x = f32Value::from_script(remover(&mut v, "x")?, world.clone())?;
                let y = f32Value::from_script(remover(&mut v, "y")?, world)?;
                Ok(Vec2::new(x, y))
            }
            _ => Err(InteropError::impossible_conversion(TypeId::of::<Vec2>())),
        }
    }
}

#[allow(dead_code)]
fn getr<'a, K, V, Q>(map: &'a HashMap<K, V>, k: &Q) -> Result<&'a V, InteropError>
where
    K: Borrow<Q> + Hash + Eq,
    Q: Hash + Eq + ?Sized + Display,
{
    map.get(k)
        .ok_or_else(|| InteropError::string_type_mismatch(k.to_string(), None))
}

fn remover<K, V, Q>(map: &mut HashMap<K, V>, k: &Q) -> Result<V, InteropError>
where
    K: Borrow<Q> + Hash + Eq,
    Q: Hash + Eq + ?Sized + Display,
{
    map.remove(k)
        .ok_or_else(|| InteropError::string_type_mismatch(k.to_string(), None))
}

pub struct RectValue;
impl FromScript for RectValue {
    type This<'w> = Rect;
    fn from_script(
        value: ScriptValue,
        world: WorldAccessGuard<'_>,
    ) -> Result<Self::This<'_>, InteropError> {
        match value {
            ScriptValue::List(l) => {
                let n = l.len();
                let mut i = l.into_iter();
                if n == 2 {
                    let a = Vec2Value::from_script(i.next().unwrap(), world.clone())?;
                    let b = Vec2Value::from_script(i.next().unwrap(), world)?;
                    Ok(Rect::from_corners(a, b))
                } else if n == 4 {
                    let x0 = f32Value::from_script(i.next().unwrap(), world.clone())?;
                    let y0 = f32Value::from_script(i.next().unwrap(), world.clone())?;
                    let x1 = f32Value::from_script(i.next().unwrap(), world.clone())?;
                    let y1 = f32Value::from_script(i.next().unwrap(), world)?;
                    Ok(Rect::from_corners(Vec2::new(x0, y0), Vec2::new(x1, y1)))
                } else {
                    Err(InteropError::impossible_conversion(TypeId::of::<Rect>()))
                }
            }
            ScriptValue::Map(mut v) => {
                let min = Vec2Value::from_script(remover(&mut v, "min")?, world.clone())?;
                let max = Vec2Value::from_script(remover(&mut v, "max")?, world)?;
                Ok(Rect { min, max })
            }
            _ => Err(InteropError::impossible_conversion(TypeId::of::<Rect>())),
        }
    }
}