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|
//! An arbitrary identifier or resource location.
use std::{
fmt::{self, Debug, Display},
hash::{Hash, Hasher},
io::{self, Cursor, Write},
num::NonZeroUsize,
str::FromStr,
};
use azalea_buf::{AzBuf, BufReadError};
#[cfg(feature = "serde")]
use serde::{Deserialize, Deserializer, Serialize, Serializer, de};
use simdnbt::{FromNbtTag, ToNbtTag, owned::NbtTag};
/// An identifier, like `minecraft:stone` or `brigadier:number`.
///
/// All registry variants can be converted to an identifier.
///
/// This was formerly called a `ResourceLocation`.
#[doc(alias = "ResourceLocation")]
#[derive(Clone, Default, Eq)]
pub struct Identifier {
// empty namespaces aren't allowed so NonZero is fine.
colon_index: Option<NonZeroUsize>,
inner: Box<str>,
}
const _: () = assert!(size_of::<Identifier>() == 24);
static DEFAULT_NAMESPACE: &str = "minecraft";
// static REALMS_NAMESPACE: &str = "realms";
impl Identifier {
pub fn new(resource_string: impl Into<String>) -> Identifier {
let mut resource_string = resource_string.into();
let colon_index = resource_string.find(':');
let colon_index = if let Some(colon_index) = colon_index {
if colon_index == 0 {
resource_string = resource_string.split_off(1);
}
NonZeroUsize::new(colon_index)
} else {
None
};
Self {
colon_index,
inner: resource_string.into(),
}
}
pub fn namespace(&self) -> &str {
if let Some(colon_index) = self.colon_index {
&self.inner[0..colon_index.get()]
} else {
DEFAULT_NAMESPACE
}
}
pub fn path(&self) -> &str {
if let Some(colon_index) = self.colon_index {
&self.inner[(colon_index.get() + 1)..]
} else {
&self.inner
}
}
}
impl PartialEq for Identifier {
fn eq(&self, other: &Self) -> bool {
self.namespace() == other.namespace() && self.path() == other.path()
}
}
impl Hash for Identifier {
fn hash<H: Hasher>(&self, state: &mut H) {
let namespace = self.namespace();
if namespace != DEFAULT_NAMESPACE {
namespace.hash(state);
}
self.path().hash(state);
}
}
impl Display for Identifier {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.colon_index.is_some() {
write!(f, "{}", self.inner)
} else {
write!(f, "{DEFAULT_NAMESPACE}:{}", self.inner)
}
}
}
impl Debug for Identifier {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{self}")
}
}
impl FromStr for Identifier {
type Err = &'static str;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Ok(Identifier::new(s))
}
}
impl From<&str> for Identifier {
fn from(s: &str) -> Self {
Identifier::new(s)
}
}
impl AzBuf for Identifier {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let location_string = String::azalea_read(buf)?;
Ok(Identifier::new(&location_string))
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
self.to_string().azalea_write(buf)
}
}
#[cfg(feature = "serde")]
impl Serialize for Identifier {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(&self.to_string())
}
}
#[cfg(feature = "serde")]
impl<'de> Deserialize<'de> for Identifier {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
if s.contains(':') {
Ok(Identifier::new(&s))
} else {
Err(de::Error::invalid_value(
de::Unexpected::Str(&s),
&"a valid Identifier",
))
}
}
}
impl FromNbtTag for Identifier {
fn from_nbt_tag(tag: simdnbt::borrow::NbtTag) -> Option<Self> {
tag.string().and_then(|s| s.to_str().parse().ok())
}
}
impl ToNbtTag for Identifier {
fn to_nbt_tag(self) -> NbtTag {
NbtTag::String(self.to_string().into())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn basic_identifier() {
let r = Identifier::new("abcdef:ghijkl");
assert_eq!(r.namespace(), "abcdef");
assert_eq!(r.path(), "ghijkl");
}
#[test]
fn no_namespace() {
let r = Identifier::new("azalea");
assert_eq!(r.namespace(), "minecraft");
assert_eq!(r.path(), "azalea");
}
#[test]
fn colon_start() {
let r = Identifier::new(":azalea");
assert_eq!(r.namespace(), "minecraft");
assert_eq!(r.path(), "azalea");
}
#[test]
fn colon_end() {
let r = Identifier::new("azalea:");
assert_eq!(r.namespace(), "azalea");
assert_eq!(r.path(), "");
}
#[test]
fn azbuf_identifier() {
let mut buf = Vec::new();
Identifier::new("minecraft:dirt")
.azalea_write(&mut buf)
.unwrap();
let mut buf = Cursor::new(&buf[..]);
assert_eq!(
Identifier::azalea_read(&mut buf).unwrap(),
Identifier::new("minecraft:dirt")
);
}
}
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