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#![doc = include_str!("../README.md")]
#![feature(trait_upcasting)]
mod behavior;
mod blocks;
use azalea_buf::{BufReadError, McBufReadable, McBufVarReadable, McBufVarWritable, McBufWritable};
pub use behavior::BlockBehavior;
pub use blocks::*;
use std::io::{Cursor, Write};
impl BlockState {
/// Transmutes a u32 to a block state.
///
/// # Safety
/// The `state_id` should be a valid block state.
#[inline]
pub unsafe fn from_u32_unchecked(state_id: u32) -> Self {
BlockState { id: state_id }
}
#[inline]
pub fn is_valid_state(state_id: u32) -> bool {
state_id <= Self::max_state()
}
}
impl TryFrom<u32> for BlockState {
type Error = ();
/// Safely converts a state id to a block state.
fn try_from(state_id: u32) -> Result<Self, Self::Error> {
if Self::is_valid_state(state_id) {
Ok(unsafe { Self::from_u32_unchecked(state_id) })
} else {
Err(())
}
}
}
impl McBufReadable for BlockState {
fn read_from(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let state_id = u32::var_read_from(buf)?;
Self::try_from(state_id).map_err(|_| BufReadError::UnexpectedEnumVariant {
id: state_id as i32,
})
}
}
impl McBufWritable for BlockState {
fn write_into(&self, buf: &mut impl Write) -> Result<(), std::io::Error> {
u32::var_write_into(&self.id, buf)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_from_u32() {
assert_eq!(BlockState::try_from(0).unwrap(), BlockState::AIR);
assert!(BlockState::try_from(BlockState::max_state()).is_ok());
assert!(BlockState::try_from(BlockState::max_state() + 1).is_err());
}
#[test]
fn test_from_blockstate() {
let block: Box<dyn Block> = Box::<dyn Block>::from(BlockState::AIR);
assert_eq!(block.id(), "air");
let block: Box<dyn Block> =
Box::<dyn Block>::from(BlockState::from(azalea_registry::Block::FloweringAzalea));
assert_eq!(block.id(), "flowering_azalea");
}
#[test]
fn test_debug_blockstate() {
let formatted = format!(
"{:?}",
BlockState::from(azalea_registry::Block::FloweringAzalea)
);
assert!(
formatted.ends_with(", FloweringAzaleaBlock)"),
"{}",
formatted
);
let formatted = format!(
"{:?}",
BlockState::from(azalea_registry::Block::BigDripleafStem)
);
assert!(
formatted.ends_with(", BigDripleafStemBlock { facing: North, waterlogged: false })"),
"{}",
formatted
);
}
}
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