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use crate::{AnyOutput, ChainProcess, NextProcess, ProgramCollect};
/// Collection variants for program control instructions.
///
/// Defines different forms of program control collections.
pub enum ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
/// Empty collection.
Empty,
/// A single control unit.
Single(ProgramControlUnit<C>),
/// A collection of multiple control units.
Multi(Vec<ProgramControlUnit<C>>),
}
impl<C> ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
/// Returns `true` if the collection is empty.
pub fn is_empty(&self) -> bool {
matches!(self, ProgramControls::Empty)
}
}
impl<C> From<()> for ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
fn from(_: ()) -> Self {
Self::Empty
}
}
impl<C> From<ProgramControlUnit<C>> for ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
fn from(unit: ProgramControlUnit<C>) -> Self {
Self::Single(unit)
}
}
impl<C> From<Vec<ProgramControlUnit<C>>> for ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
fn from(units: Vec<ProgramControlUnit<C>>) -> Self {
Self::Multi(units)
}
}
impl<C> IntoIterator for ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
type Item = ProgramControlUnit<C>;
type IntoIter = ProgramControlsIter<C>;
fn into_iter(self) -> Self::IntoIter {
match self {
ProgramControls::Empty => ProgramControlsIter {
inner: vec![].into_iter(),
},
ProgramControls::Single(unit) => ProgramControlsIter {
inner: vec![unit].into_iter(),
},
ProgramControls::Multi(units) => ProgramControlsIter {
inner: units.into_iter(),
},
}
}
}
/// An iterator over [`ProgramControlUnit`] values.
pub struct ProgramControlsIter<C>
where
C: ProgramCollect<Enum = C>,
{
inner: std::vec::IntoIter<ProgramControlUnit<C>>,
}
impl<C> Iterator for ProgramControlsIter<C>
where
C: ProgramCollect<Enum = C>,
{
type Item = ProgramControlUnit<C>;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
}
impl<C> std::iter::FusedIterator for ProgramControlsIter<C>
where
C: ProgramCollect<Enum = C>,
{
// Auto impl
}
/// Enumeration of program control units.
///
/// Defines the various control flow instructions that a program may encounter during execution,
/// used to alter the default execution flow (e.g., interruption, jump, or redirection).
pub enum ProgramControlUnit<C>
where
C: ProgramCollect<Enum = C>,
{
/// Override the program exit code.
///
/// Used when a non-default process exit code needs to be forcibly specified.
/// The contained `i32` value is the exit code to be set.
OverrideExitCode(i32),
/// Route to the render flow.
///
/// Transfers control to the rendering (output) stage,
/// carrying the `AnyOutput<C>` to be rendered.
RouteToRender(AnyOutput<C>),
/// Route to the chain processing flow.
///
/// Transfers control to the next chained processor,
/// carrying the `AnyOutput<C>` that needs to be passed along.
RouteToChain(AnyOutput<C>),
/// Route to the help information flow.
///
/// Transfers control to the help information display module,
/// carrying the `AnyOutput<C>` containing help-related content.
RouteToHelp(AnyOutput<C>),
}
impl<C> From<ChainProcess<C>> for ProgramControlUnit<C>
where
C: ProgramCollect<Enum = C>,
{
fn from(val: ChainProcess<C>) -> Self {
match val {
ChainProcess::Ok((any, next)) => match next {
NextProcess::Chain => ProgramControlUnit::RouteToChain(any),
NextProcess::Renderer => ProgramControlUnit::RouteToRender(any),
},
ChainProcess::Err(e) => panic!("{}", &e),
}
}
}
impl<C> From<ChainProcess<C>> for ProgramControls<C>
where
C: ProgramCollect<Enum = C>,
{
fn from(val: ChainProcess<C>) -> Self {
let unit: ProgramControlUnit<C> = val.into();
unit.into()
}
}
|
