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use crate::types::binary::OwnedBinary;
use crate::wrapper::env::term_to_binary;
use crate::wrapper::NIF_TERM;
use crate::{Binary, Decoder, Env, NifResult};
use std::cmp::Ordering;
use std::fmt::{self, Debug};
use std::hash::{Hash, Hasher};
#[derive(Clone, Copy)]
pub struct Term<'a> {
term: NIF_TERM,
env: Env<'a>,
}
impl<'a> Debug for Term<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
crate::wrapper::term::fmt(self.as_c_arg(), f)
}
}
impl<'a> Term<'a> {
pub unsafe fn new(env: Env<'a>, inner: NIF_TERM) -> Self {
Term { term: inner, env }
}
pub fn as_c_arg(&self) -> NIF_TERM {
self.term
}
pub fn get_env(&self) -> Env<'a> {
self.env
}
pub fn in_env<'b>(&self, env: Env<'b>) -> Term<'b> {
if self.get_env() == env {
unsafe { Term::new(env, self.as_c_arg()) }
} else {
unsafe {
Term::new(
env,
rustler_sys::enif_make_copy(env.as_c_arg(), self.as_c_arg()),
)
}
}
}
pub fn decode<T>(self) -> NifResult<T>
where
T: Decoder<'a>,
{
Decoder::decode(self)
}
pub fn decode_as_binary(self) -> NifResult<Binary<'a>> {
if self.is_binary() {
return Binary::from_term(self);
}
Binary::from_iolist(self)
}
pub fn to_binary(self) -> OwnedBinary {
let raw_binary = unsafe { term_to_binary(self.env.as_c_arg(), self.as_c_arg()) }.unwrap();
unsafe { OwnedBinary::from_raw(raw_binary) }
}
pub fn hash_internal(&self, salt: u32) -> u32 {
unsafe {
rustler_sys::enif_hash(
rustler_sys::ErlNifHash::ERL_NIF_INTERNAL_HASH,
self.as_c_arg(),
salt as u64,
) as u32
}
}
pub fn hash_phash2(&self) -> u32 {
unsafe {
rustler_sys::enif_hash(rustler_sys::ErlNifHash::ERL_NIF_PHASH2, self.as_c_arg(), 0)
as u32
}
}
}
impl<'a> PartialEq for Term<'a> {
fn eq(&self, other: &Term) -> bool {
unsafe { rustler_sys::enif_is_identical(self.as_c_arg(), other.as_c_arg()) == 1 }
}
}
impl<'a> Eq for Term<'a> {}
fn cmp(lhs: &Term, rhs: &Term) -> Ordering {
let ord = unsafe { rustler_sys::enif_compare(lhs.as_c_arg(), rhs.as_c_arg()) };
match ord {
0 => Ordering::Equal,
n if n < 0 => Ordering::Less,
_ => Ordering::Greater,
}
}
impl<'a> Ord for Term<'a> {
fn cmp(&self, other: &Term) -> Ordering {
cmp(self, other)
}
}
impl<'a> PartialOrd for Term<'a> {
fn partial_cmp(&self, other: &Term<'a>) -> Option<Ordering> {
Some(cmp(self, other))
}
}
impl<'a> Hash for Term<'a> {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write_u32(self.hash_internal(0));
}
}
unsafe impl<'a> Sync for Term<'a> {}
unsafe impl<'a> Send for Term<'a> {}