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params.rs
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params.rs
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//! Fixed size parameters list with optional subparameters.
use core::fmt::{self, Debug, Formatter};
pub(crate) const MAX_PARAMS: usize = 32;
#[derive(Default)]
pub struct Params {
/// Number of subparameters for each parameter.
///
/// For each entry in the `params` slice, this stores the length of the param as number of
/// subparams at the same index as the param in the `params` slice.
///
/// At the subparam positions the length will always be `0`.
subparams: [u8; MAX_PARAMS],
/// All parameters and subparameters.
params: [u16; MAX_PARAMS],
/// Number of suparameters in the current parameter.
current_subparams: u8,
/// Total number of parameters and subparameters.
len: usize,
}
impl Params {
/// Returns the number of parameters.
#[inline]
pub fn len(&self) -> usize {
self.len
}
/// Returns `true` if there are no parameters present.
#[inline]
pub fn is_empty(&self) -> bool {
self.len == 0
}
/// Returns an iterator over all parameters and subparameters.
#[inline]
pub fn iter(&self) -> ParamsIter<'_> {
ParamsIter::new(self)
}
/// Returns `true` if there is no more space for additional parameters.
#[inline]
pub(crate) fn is_full(&self) -> bool {
self.len == MAX_PARAMS
}
/// Clear all parameters.
#[inline]
pub(crate) fn clear(&mut self) {
self.current_subparams = 0;
self.len = 0;
}
/// Add an additional parameter.
#[inline]
pub(crate) fn push(&mut self, item: u16) {
self.subparams[self.len - self.current_subparams as usize] = self.current_subparams + 1;
self.params[self.len] = item;
self.current_subparams = 0;
self.len += 1;
}
/// Add an additional subparameter to the current parameter.
#[inline]
pub(crate) fn extend(&mut self, item: u16) {
self.subparams[self.len - self.current_subparams as usize] = self.current_subparams + 1;
self.params[self.len] = item;
self.current_subparams += 1;
self.len += 1;
}
}
impl<'a> IntoIterator for &'a Params {
type IntoIter = ParamsIter<'a>;
type Item = &'a [u16];
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
/// Immutable subparameter iterator.
pub struct ParamsIter<'a> {
params: &'a Params,
index: usize,
}
impl<'a> ParamsIter<'a> {
fn new(params: &'a Params) -> Self {
Self { params, index: 0 }
}
}
impl<'a> Iterator for ParamsIter<'a> {
type Item = &'a [u16];
fn next(&mut self) -> Option<Self::Item> {
if self.index >= self.params.len() {
return None;
}
// Get all subparameters for the current parameter.
let num_subparams = self.params.subparams[self.index];
let param = &self.params.params[self.index..self.index + num_subparams as usize];
// Jump to the next parameter.
self.index += num_subparams as usize;
Some(param)
}
fn size_hint(&self) -> (usize, Option<usize>) {
let remaining = self.params.len() - self.index;
(remaining, Some(remaining))
}
}
impl Debug for Params {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "[")?;
for (i, param) in self.iter().enumerate() {
if i != 0 {
write!(f, ";")?;
}
for (i, subparam) in param.iter().enumerate() {
if i != 0 {
write!(f, ":")?;
}
subparam.fmt(f)?;
}
}
write!(f, "]")
}
}